@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,500;8..60,600;8..60,700&display=swap");

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Cool canvas + square grid */
  --canvas-bg: #f7f9fa;
  --grid-line: rgba(197, 206, 210, 0.22);
  --grid-size: 56px;
  --bg-pattern:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);

  --bg-color: var(--canvas-bg);
  --text-color: #1a1a1a;
  --accent-color: #8a9ba3;
  --active-tint: #eef1f3;
  --border-color: #e2e6e9;
  --surface-white: #ffffff;
  --surface-border: #e4e8eb;
  --bg-hover: #e8ecef;
  --text-muted: #666666;
  --bg-sidebar: #f3f6f8;
  --sidebar-divider: #e2e6e9;
  --transition-soft: 0.2s ease;
  --header-height: 3.5rem;
  --content-max: 900px;
  --space-block: 24px;
  --unit-gap: 16px;
  --sidebar-width: 240px;

  /* Blue-gray accent palette — primary #c5ced2 */
  --accent-primary: #c5ced2;
  --accent-primary-dark: #8a9ba3;
  --accent-primary-darker: #6b7f8a;
  --accent-bg: #eef1f3;
  --accent-bg-soft: #eef1f3;
  --accent-border: #c5ced2;
  --accent-text: #6b7f8a;
  --accent-text-hover: #556670;
  --accent-tint: #eef1f3;
  --accent-shadow: rgba(107, 127, 138, 0.16);
  --brand-ap: #8a9ba3;
  --premium-accent-bg: linear-gradient(145deg, #eef1f3 0%, #e4e9ec 100%);
  --premium-accent-border: #c5ced2;
  --btn-primary: #8a9ba3;
  --btn-primary-hover: #6b7f8a;

  /* Toolbox icon jewel tones */
  --icon-lavender-bg: #ddd0f0;
  --icon-lavender-fg: #4a3060;
  --icon-lavender-shadow: rgba(74, 48, 96, 0.22);
  --icon-sage-bg: #b8dbc8;
  --icon-sage-fg: #1b5e3b;
  --icon-sage-shadow: rgba(27, 94, 59, 0.22);
  --icon-sky-bg: #a8cce8;
  --icon-sky-fg: #1a4f7a;
  --icon-sky-shadow: rgba(26, 79, 122, 0.22);
  --icon-neutral-bg: #eef1f3;
  --icon-neutral-fg: #6b6560;

  /* Subject enamel dots */
  --dot-calculus: #e85d75;
  --dot-statistics: #2ead6e;
  --dot-government: #3b82c4;

  --bg-main: var(--bg-color);
  --text-primary: var(--text-color);
  --border: var(--border-color);

  --radius-pill: 9999px;
  --radius-card: 24px;
  --radius-soft: 16px;
  --shadow-float:
    0 1px 2px rgba(26, 26, 26, 0.04),
    0 4px 12px rgba(26, 26, 26, 0.05);
  --shadow-float-hover:
    0 2px 4px rgba(26, 26, 26, 0.05),
    0 8px 24px rgba(26, 26, 26, 0.08);
  --shadow-accent:
    0 4px 20px rgba(138, 155, 163, 0.14),
    0 1px 4px rgba(138, 155, 163, 0.08);
}

html {
  font-size: 16px;
  background-color: var(--canvas-bg);
  background-image: var(--bg-pattern);
  background-size: var(--grid-size) var(--grid-size);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: "Inter", -apple-system, sans-serif;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text-color);
  background: transparent;
  min-height: 100vh;
  padding-top: var(--header-height);
}

/* —— Dashboard theme: soft ivory canvas + lavender accents —— */
html:has(.home-page) {
  background-color: #fcfbfb;
  background-image: none;
}

body.home-page {
  /* Re-map the shared accent palette to lavender for the dashboard only */
  --dashboard-bg: #fcfbfb;
  --accent-primary: #b6a8e0;
  --accent-primary-dark: #7b6bb5;
  --accent-primary-darker: #5f4f97;
  --accent-text: #5a4c91;
  --accent-text-hover: #483d78;
  --accent-bg-soft: #ece7f8;
  --accent-bg: #ece7f8;
  --accent-tint: #efecf9;
  --accent-border: #d6ccf0;
  --active-tint: #efecf9;
  --accent-shadow: rgba(123, 107, 181, 0.16);
  --shadow-accent:
    0 4px 20px rgba(123, 107, 181, 0.16),
    0 1px 4px rgba(123, 107, 181, 0.1);
  --premium-accent-bg: #f7f2eb;
  --premium-accent-border: #ebe4d9;

  /* Warm ivory surfaces */
  --surface-border: #ece7dd;
  --bg-sidebar: #f9f8f7;
  --sidebar-divider: #eae5da;
  --text-muted: #83808c;
  --dashboard-ui-max-width: min(94%, 1140px);
  --dashboard-hero-width: 100%;
  --dashboard-continue-width: min(90%, 1020px);
  --dashboard-scene-height: clamp(210px, 24vh, 280px);
  --dashboard-top-offset: clamp(9rem, 13vh, 11.5rem);
  --dashboard-left-offset: clamp(3.75rem, 5.5vw, 5rem);
  --dashboard-footer-gap: clamp(2.5rem, 4vh, 3.5rem);
  /* Right-edge fade: only the right 40% softens; transparency stays very subtle */
  --dashboard-surface-fade: linear-gradient(
    to right,
    #ffffff 0%,
    #ffffff 60%,
    rgba(255, 255, 255, 0.92) 100%
  );

  background-color: var(--dashboard-bg);
}

a,
button,
.nav-btn,
.search-browse-input,
.unit-box,
.unit-box summary {
  transition:
    color var(--transition-soft),
    background-color var(--transition-soft),
    border-color var(--transition-soft);
}

/* —— Global header —— */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--header-height);
  background: var(--surface-white);
  border-bottom: 1px solid var(--border-color);
}

.site-header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-block);
}

.header-logo {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-color);
  text-decoration: none;
  white-space: nowrap;
}

.logo-ap {
  color: var(--brand-ap);
}

.header-logo:hover {
  color: var(--text-color);
  text-decoration: underline;
  text-decoration-color: var(--accent-color);
  text-underline-offset: 3px;
}

.header-logo:focus-visible,
.breadcrumb a:focus-visible,
.search-browse-input:focus-visible,
.search-browse-option:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  min-width: 0;
}

.breadcrumb a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumb a:hover,
.breadcrumb a:active {
  color: var(--text-color);
  text-decoration: underline;
  text-decoration-color: var(--accent-color);
  text-underline-offset: 3px;
}

.breadcrumb-sep {
  color: var(--text-muted);
  user-select: none;
}

.breadcrumb-current {
  color: var(--text-color);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--accent-color);
  text-underline-offset: 3px;
}

.header-center {
  min-width: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.search-browse {
  position: relative;
}

.search-browse-input {
  width: 14rem;
  padding: 0.5rem 0.75rem;
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--text-color);
  background: var(--surface-white);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.search-browse-input::placeholder {
  color: var(--text-muted);
}

.search-browse-input:focus,
.search-browse.is-open .search-browse-input {
  border-color: var(--accent-color);
  outline: none;
  box-shadow: 0 0 0 1px var(--accent-color);
}

.search-browse-list {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 300;
  min-width: 100%;
  width: max(100%, 13.75rem);
  list-style: none;
  background: var(--surface-white);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.search-browse-list[hidden] {
  display: none;
}

.search-browse-option {
  display: block;
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  color: var(--text-color);
  text-decoration: none;
}

.search-browse-option:hover,
.search-browse-option:active,
.search-browse-option:focus-visible {
  background: var(--active-tint);
  color: var(--text-color);
  font-weight: 600;
}

.search-browse-empty {
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* —— Page layout —— */
.page {
  margin-left: var(--sidebar-width);
  min-height: calc(100vh - var(--header-height));
  display: flex;
  flex-direction: column;
  background: transparent;
}

.page--subject {
  margin-left: 0;
}

/* —— Launchpad (homepage) —— */
.home-page .site-header {
  border-bottom: none;
  box-shadow:
    0 2px 16px rgba(45, 55, 72, 0.04),
    0 1px 3px rgba(45, 55, 72, 0.03);
}

.home-page .sidebar--workspace {
  top: 0;
  height: 100vh;
  padding: 0;
  overflow: hidden;
  border-right: 1px solid var(--sidebar-divider);
  box-shadow: none;
}

@media (min-width: 769px) {
  .home-page {
    padding-top: 0;
  }

  .home-page .site-header {
    display: none;
  }

  .home-page .page--dashboard {
    min-height: 100vh;
  }

  .home-page .launchpad {
    min-height: auto;
  }
}

/* Dashboard surfaces — dropdown stays opaque; hero cards fade on the right (desktop) */
.home-page .continue-studying,
.home-page .search-browse-input--launchpad,
.home-page .search-browse-list--launchpad {
  border: 1px solid var(--surface-border);
}

.home-page .search-browse-list--launchpad {
  background-color: #ffffff;
}

.home-page .continue-studying,
.home-page .search-browse-input--launchpad {
  background-color: #ffffff;
}

@media (min-width: 900px) {
  .home-page .continue-studying,
  .home-page .search-browse-input--launchpad {
    background: var(--dashboard-surface-fade);
  }
}

.home-page .site-header-inner--launchpad {
  grid-template-columns: 1fr;
}

.launchpad {
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 3.25rem 2.5rem 5rem;
  min-height: calc(100vh - var(--header-height) - 12rem);
}

.launchpad-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  flex-shrink: 0;
}

.launchpad-headline {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: #1a1a1a;
}

.launchpad-search {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 3rem;
  padding-bottom: 0;
  gap: 1.25rem;
}

.launchpad-search-prompt {
  width: 100%;
  max-width: 100%;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--text-muted);
  text-align: left;
}

.search-browse--launchpad {
  position: relative;
  width: 100%;
  max-width: 100%;
}

.search-browse-input--launchpad {
  width: 100%;
  padding: 1.5rem 1.75rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 1.25rem;
  font-weight: 400;
  color: #1a1a1a;
  background-color: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
  transition: box-shadow 0.3s ease-in-out;
}

.search-browse-input--launchpad::placeholder {
  color: #a0aec0;
  font-size: 1.125rem;
}

.search-browse--launchpad.is-open .search-browse-input--launchpad,
.search-browse-input--launchpad:focus {
  outline: none;
  box-shadow: var(--shadow-float-hover), var(--shadow-accent);
}

.search-browse-list--launchpad {
  left: 0;
  right: 0;
  width: 100%;
  border: 1px solid var(--surface-border);
  border-top: none;
  border-radius: 0 0 var(--radius-card) var(--radius-card);
  box-shadow: var(--shadow-float-hover);
  padding: 0.375rem;
}

.search-browse-list--launchpad .search-browse-option {
  border-radius: var(--radius-soft);
}

.sidebar--workspace {
  display: flex;
  flex-direction: column;
}

.sidebar-top {
  flex-shrink: 0;
  padding: 1.25rem 1.25rem 0;
}

.sidebar-subjects {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 1rem 1.25rem 0.625rem;
}

.subjects-list {
  flex: 0 1 auto;
  max-height: 100%;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(15, 23, 42, 0.16) transparent;
}

.sidebar-subjects .sidebar-nav {
  gap: 0.5rem;
}

.subjects-list::-webkit-scrollbar {
  width: 4px;
}

.subjects-list::-webkit-scrollbar-thumb {
  background: rgba(15, 23, 42, 0.16);
  border-radius: 999px;
}

.sidebar-subjects-actions {
  flex-shrink: 0;
  padding-top: 0.375rem;
}

.sidebar-bottom {
  flex-shrink: 0;
  border-top: 1px solid var(--sidebar-divider);
  padding: 0.75rem 1.25rem 1rem;
}

.sidebar-logo {
  display: block;
  margin-bottom: 1.25rem;
  text-decoration: none;
  color: var(--accent-text);
}

.sidebar-logo .logo-ap {
  color: var(--accent-text);
}

.sidebar-logo:hover {
  text-decoration: underline;
  text-decoration-color: var(--accent-text);
  text-underline-offset: 3px;
}

.sidebar-heading {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.sidebar-heading--subjects {
  margin-top: 0;
  margin-bottom: 0.625rem;
}

.sidebar-action-link {
  display: block;
  padding: 0.375rem 0;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
}

.sidebar-action-link:hover {
  color: var(--text-color);
  font-weight: 600;
}

.sidebar-premium {
  background: var(--premium-accent-bg);
  border: 1px solid var(--premium-accent-border);
  border-radius: 16px;
  padding: 12px 14px;
  margin-bottom: 0.75rem;
  box-shadow: 0 2px 10px rgba(107, 127, 138, 0.12);
}

.sidebar-premium-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent-text-hover);
  margin-bottom: 0.25rem;
}

.sidebar-premium-desc {
  font-size: 11px;
  line-height: 1.45;
  color: #5a6670;
  margin-bottom: 0.625rem;
}

.sidebar-premium-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 32px;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 700;
  color: #ffffff;
  background: var(--accent-primary-dark);
  border-radius: 999px;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(107, 127, 138, 0.22);
  transition:
    background-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.sidebar-premium-btn:hover {
  background: var(--accent-text-hover);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(85, 102, 112, 0.28);
}

.sidebar-nav--bottom {
  gap: 0;
  margin-bottom: 0.625rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-color);
  text-decoration: none;
}

.sidebar-link-icon {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  color: var(--text-muted);
}

.sidebar-link:hover {
  color: var(--text-color);
  font-weight: 600;
}

.sidebar-profile {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.sidebar-profile-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--active-tint);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-color);
}

.sidebar-profile-info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  min-width: 0;
}

.sidebar-profile-name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-color);
}

.sidebar-profile-plan {
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.content-container {
  max-width: var(--content-max);
  margin: 0 auto;
  width: 100%;
  padding: var(--space-block);
}

.content {
  flex: 1;
}

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background: var(--bg-sidebar);
  border-right: 1px solid var(--sidebar-divider);
  overflow: hidden;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-btn {
  display: block;
  width: 100%;
  padding: 0.875rem 1.25rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  text-align: left;
  text-decoration: none;
  color: var(--text-color);
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition:
    color var(--transition-soft),
    background-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.nav-btn:hover,
.nav-btn:active,
.nav-btn.is-active {
  background: var(--active-tint);
  color: var(--text-color);
  font-weight: 600;
  box-shadow: var(--shadow-float);
}

.nav-btn--dashboard.is-active {
  position: relative;
  background: var(--accent-bg-soft);
  border: none;
  color: var(--accent-text);
  box-shadow: none;
}

.nav-btn--dashboard.is-active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--accent-primary);
  border-radius: 0 3px 3px 0;
}

.nav-btn--dashboard.is-active:hover {
  background: var(--accent-bg-soft);
  color: var(--accent-text-hover);
  box-shadow: none;
}

/* Subject enamel dot indicators */
.sidebar-subjects .nav-btn {
  position: relative;
  padding-left: 2.125rem;
}

.sidebar-subjects .nav-btn::after {
  content: "";
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  box-shadow: inset 0 -1px 1px rgba(0, 0, 0, 0.12);
}

.sidebar-subjects .nav-btn:nth-child(1)::after {
  background: var(--dot-calculus);
}

.sidebar-subjects .nav-btn:nth-child(2)::after {
  background: var(--dot-statistics);
}

.sidebar-subjects .nav-btn:nth-child(3)::after {
  background: var(--dot-government);
}

.nav-btn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.content > h1,
.content-container > h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.3;
  margin-bottom: 0;
}

.intro-text {
  font-size: 0.95rem;
  color: #666666;
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 800px;
}

.units {
  margin-top: var(--space-block);
}

/* —— Subject directory: units + study tools sidebar —— */
.page--subject .content-container:has(.subject-layout) {
  max-width: 1120px;
}

.subject-layout {
  display: flex;
  align-items: flex-start;
  gap: var(--space-block);
  margin-top: var(--space-block);
}

.subject-layout__main.units {
  flex: 3 1 0;
  min-width: 0;
  margin-top: 0;
}

.study-tools {
  flex: 1 0 220px;
  max-width: 28%;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--surface-white);
}

.study-tools__heading {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}

.study-tools__modes {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.study-tools__mode {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  text-align: left;
  color: var(--text-color);
  background: var(--surface-white);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition:
    background-color var(--transition-soft),
    border-color var(--transition-soft),
    color var(--transition-soft);
}

.study-tools__mode:hover:not(:disabled):not(.is-disabled) {
  background: var(--active-tint);
  border-color: var(--accent-color);
}

.study-tools__mode.is-active {
  background: var(--active-tint);
  border-color: var(--accent-color);
  color: var(--text-color);
  font-weight: 600;
}

.study-tools__mode.is-disabled,
.study-tools__mode:disabled {
  color: var(--text-muted);
  background: var(--bg-color);
  border-color: var(--border-color);
  cursor: not-allowed;
  opacity: 0.85;
}

.study-tools__badge {
  flex-shrink: 0;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.35rem;
  border-radius: 2px;
  background: var(--surface-white);
}

.study-tools__hint {
  margin-top: 0.875rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.study-tools__mode:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.units-grid {
  display: flex;
  flex-direction: column;
  gap: var(--unit-gap);
  width: 100%;
}

.unit-box {
  width: 100%;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--surface-white);
  overflow: hidden;
}

.unit-box details {
  width: 100%;
}

.unit-box summary {
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.4;
  color: var(--text-color);
  background: var(--surface-white);
  cursor: pointer;
  list-style: none;
}

.unit-sub {
  font-size: 0.8125rem;
  font-weight: 400;
  color: #666666;
  margin-left: 0.35em;
}

.unit-box summary::-webkit-details-marker {
  display: none;
}

.unit-box summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: var(--text-muted);
}

.unit-box details[open] summary::after {
  content: "−";
}

.unit-box summary:hover {
  background: var(--active-tint);
  color: var(--text-color);
}

.unit-box:has(details[open]) {
  background: var(--surface-white);
  border-top-color: var(--accent-color);
  border-bottom-color: var(--accent-color);
  border-left-color: var(--border-color);
  border-right-color: var(--border-color);
}

.unit-box details[open] summary {
  background: var(--surface-white);
  color: var(--text-color);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.unit-box details[open] summary:hover {
  background: var(--active-tint);
}

.unit-box details[open] summary::after {
  color: var(--text-muted);
  font-weight: 600;
}

.unit-box summary:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: -2px;
}

.unit-links {
  list-style: none;
  border-top: 1px solid var(--border-color);
  padding: 0.75rem 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.unit-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-color);
  text-decoration: none;
}

.unit-box:has(details[open]) .unit-links a {
  color: var(--text-color);
}

.unit-links a:hover,
.unit-links a:active,
.unit-links a:focus-visible {
  color: var(--text-color);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--accent-color);
  text-underline-offset: 3px;
}

.unit-links a:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* —— Continue Studying —— */
.continue-studying {
  width: 100%;
  max-width: 100%;
  margin: 2.75rem auto 0;
  padding: 2rem 2.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  background-color: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
  transition: box-shadow 0.3s ease-in-out;
}

.continue-studying:hover {
  box-shadow: var(--shadow-float-hover);
}

.continue-studying[hidden] {
  display: none;
}

.continue-studying-body {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.continue-studying-icon {
  flex-shrink: 0;
  font-size: 1.25rem;
  line-height: 1;
  opacity: 0.55;
  filter: grayscale(1);
}

.continue-studying-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.continue-studying-label {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.continue-studying-subject {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-color);
}

.continue-studying-subtitle {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--text-muted);
}

.continue-studying-btn {
  flex-shrink: 0;
  display: inline-block;
  padding: 0.55rem 1.375rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--accent-primary-dark);
  border: none;
  border-radius: var(--radius-pill);
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(107, 127, 138, 0.18);
  transition:
    background-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.continue-studying-btn:hover {
  background: var(--accent-text-hover);
  box-shadow: 0 6px 20px rgba(85, 102, 112, 0.22);
}

.continue-studying-btn:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

/* —— Action Toolbox —— */
.toolbox {
  width: 100%;
  max-width: 100%;
  margin: 2.5rem auto 0;
}

.toolbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.25rem;
}

.toolbox-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  width: 100%;
  min-width: 0;
  padding: 1.5rem 1.375rem 1.625rem;
  background-color: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.toolbox-card:hover {
  box-shadow:
    0 8px 32px var(--accent-shadow),
    0 2px 8px rgba(45, 55, 72, 0.06);
  transform: translateY(-2px);
}

.toolbox-card:hover .toolbox-card-action {
  background: var(--accent-primary-dark);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(107, 127, 138, 0.18);
}

.toolbox-card:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

.toolbox-card-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--icon-neutral-bg);
  color: var(--icon-neutral-fg);
}

/* Instant FRQ Grader — rich milky lavender */
.toolbox-grid > .toolbox-card:nth-child(1) .toolbox-card-icon-wrap {
  background: var(--icon-lavender-bg);
  color: var(--icon-lavender-fg);
  box-shadow: 0 4px 14px var(--icon-lavender-shadow);
}

/* Score Calculator — rich creamy sage */
.toolbox-grid > .toolbox-card:nth-child(2) .toolbox-card-icon-wrap {
  background: var(--icon-sage-bg);
  color: var(--icon-sage-fg);
  box-shadow: 0 4px 14px var(--icon-sage-shadow);
}

/* Graphing Calculator — rich soft sky blue */
.toolbox-grid > .toolbox-card:nth-child(3) .toolbox-card-icon-wrap {
  background: var(--icon-sky-bg);
  color: var(--icon-sky-fg);
  box-shadow: 0 4px 14px var(--icon-sky-shadow);
}

.toolbox-card-icon {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.toolbox-card-title {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-color);
}

.toolbox-card-desc {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-muted);
  flex: 1;
}

.toolbox-card-action {
  display: inline-block;
  margin-top: auto;
  padding: 0.4rem 1.125rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(45, 55, 72, 0.05);
  border: none;
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 8px rgba(45, 55, 72, 0.04);
  transition:
    background-color 0.25s ease,
    box-shadow 0.25s ease,
    color 0.25s ease;
}

/* —— Instant FRQ Grader: Pure Search Gateway —— */
.frq-gateway-page {
  padding-top: 0;
  min-height: 100vh;
  background: transparent;
}

.frq-gateway-topbar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  width: 100%;
  height: 64px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.frq-gateway-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 2rem;
}

.frq-gateway-logo {
  flex-shrink: 0;
}

.frq-gateway-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.frq-gateway-back {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--accent-text);
  text-decoration: none;
  text-underline-offset: 3px;
  white-space: nowrap;
  transition:
    opacity var(--transition-soft),
    text-decoration-color var(--transition-soft);
}

.frq-gateway-back:hover {
  opacity: 0.8;
  text-decoration: underline;
  text-decoration-color: var(--accent-text);
}

.frq-gateway-back:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
  border-radius: 4px;
}

.frq-gateway-nav-mobile {
  display: none;
  position: relative;
}

.frq-gateway-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-color);
  cursor: pointer;
  transition:
    background-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.frq-gateway-menu-btn:hover {
  background: var(--active-tint);
  box-shadow: var(--shadow-float);
}

.frq-gateway-menu-btn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.frq-gateway-menu-close {
  display: none;
}

.frq-gateway-menu-btn[aria-expanded="true"] .frq-gateway-menu-icon {
  display: none;
}

.frq-gateway-menu-btn[aria-expanded="true"] .frq-gateway-menu-close {
  display: block;
}

.frq-gateway-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 12.5rem;
  padding: 0.375rem;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: var(--shadow-float-hover);
}

.frq-gateway-menu[hidden] {
  display: none;
}

.frq-gateway-menu-link {
  display: block;
  padding: 0.75rem 1rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-text);
  text-decoration: none;
  text-underline-offset: 3px;
  border-radius: 8px;
  transition:
    opacity var(--transition-soft),
    background-color 0.2s ease,
    text-decoration-color var(--transition-soft);
}

.frq-gateway-menu-link:hover {
  opacity: 0.8;
  text-decoration: underline;
  text-decoration-color: var(--accent-text);
  background-color: var(--accent-tint);
}

.frq-gateway-menu-link:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: -2px;
}

.frq-gateway {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100%;
  padding: 2rem 1.5rem;
}

.frq-gateway-hero {
  width: 100%;
  max-width: 700px;
  margin-bottom: 2.5rem;
  text-align: center;
}

.frq-gateway-title {
  margin-bottom: 1.5rem;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: #1a1a1a;
}

.frq-gateway-subtitle {
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.9375rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-muted);
}

.frq-gateway-search {
  position: relative;
  width: 100%;
  max-width: 700px;
}

.frq-gateway-input-wrap {
  position: relative;
  width: 100%;
}

.frq-gateway-chevron {
  position: absolute;
  top: 50%;
  right: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #a0aec0;
  pointer-events: none;
  transform: translateY(-50%);
}

.frq-gateway-input {
  display: block;
  width: 100%;
  padding: 1rem 3rem 1rem 1.5rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 1.125rem;
  font-weight: 400;
  color: #1a1a1a;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: var(--shadow-float);
  transition: box-shadow 0.3s ease-in-out;
}

.frq-gateway-input::placeholder {
  color: #a0aec0;
}

.frq-gateway-input:focus {
  outline: none;
}

.frq-gateway-search.is-open .frq-gateway-input {
  box-shadow: var(--shadow-float-hover), var(--shadow-accent);
}

.frq-gateway-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  z-index: 50;
  margin: 0;
  padding: 0.375rem;
  list-style: none;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: var(--shadow-float-hover);
}

.frq-gateway-dropdown[hidden] {
  display: none;
}

.frq-gateway-option {
  display: block;
  width: 100%;
  padding: 0.8125rem 1rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-align: left;
  color: var(--text-color);
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.frq-gateway-option:hover,
.frq-gateway-option:focus-visible {
  background-color: var(--accent-tint);
  outline: none;
}

.frq-gateway-empty {
  padding: 0.875rem 1rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.55;
  color: var(--text-muted);
}

/* —— Instant FRQ Grader: Pre-Exam Setup —— */
.frq-setup-topbar-inner {
  width: 100%;
}

.frq-setup-back {
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: #64748b;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition:
    color var(--transition-soft),
    text-decoration-color var(--transition-soft);
}

.frq-setup-back:hover {
  color: #1e293b;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: #cbd5e1;
}

.frq-setup-back:focus-visible {
  outline: 2px solid #94a3b8;
  outline-offset: 2px;
  border-radius: 4px;
}

.frq-setup-badge {
  flex-shrink: 0;
  padding: 0.4rem 0.875rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #475569;
  background-color: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

/* —— FRQ Workspace (resizable layout) —— */
.frq-workspace-page {
  overflow: hidden;
}

.frq-workspace {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: calc(100vh - 64px);
  margin-top: 64px;
  box-sizing: border-box;
}

.frq-panel-group {
  display: flex;
  flex: 1;
  min-height: 0;
  width: 100%;
  background-color: var(--canvas-bg);
  background-image: var(--bg-pattern);
  background-size: var(--grid-size) var(--grid-size);
}

.frq-panel {
  min-height: 0;
  min-width: 0;
}

.frq-panel--pdf {
  flex: 0 0 var(--pdf-width, 50%);
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.82);
  border-right: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.frq-panel--workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.frq-panel-resizer {
  flex: 0 0 6px;
  position: relative;
  z-index: 10;
  cursor: col-resize;
  background: var(--border-color);
  transition: background-color 0.15s ease;
  touch-action: none;
}

.frq-panel-resizer::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 3px;
  height: 2.5rem;
  border-radius: 9999px;
  background: #cbd5e1;
  transform: translate(-50%, -50%);
  transition: background-color 0.15s ease, height 0.15s ease;
}

.frq-panel-resizer:hover,
.frq-panel-resizer:focus-visible,
.frq-panel-resizer.is-dragging {
  background: var(--accent-border);
}

.frq-panel-resizer:hover::after,
.frq-panel-resizer:focus-visible::after,
.frq-panel-resizer.is-dragging::after {
  background: var(--accent-primary-dark);
  height: 3.5rem;
}

.frq-panel-resizer:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: -2px;
}

body.frq-resizing {
  cursor: col-resize;
  user-select: none;
}

.frq-pdf-header {
  flex-shrink: 0;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.6);
}

.frq-pdf-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.frq-pdf-viewer {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background: #525659;
}

.frq-pdf-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: none;
}

.frq-input-toggle {
  flex-shrink: 0;
  display: flex;
  gap: 0.375rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.frq-input-tab {
  flex: 1;
  max-width: 10rem;
  padding: 0.625rem 1.25rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  transition:
    background-color var(--transition-soft),
    border-color var(--transition-soft),
    color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.frq-input-tab:hover {
  color: var(--text-color);
  background: var(--bg-hover);
}

.frq-input-tab.is-active {
  color: var(--accent-text-hover);
  background: var(--accent-tint);
  border-color: var(--accent-border);
  box-shadow: 0 1px 4px var(--accent-shadow);
}

.frq-input-tab:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

.frq-input-area {
  flex: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
}

.frq-input-view {
  position: absolute;
  inset: 0;
  display: none;
  overflow: hidden;
}

.frq-input-view.is-active {
  display: block;
}

.frq-input-view--whiteboard {
  display: none;
  flex-direction: column;
}

.frq-input-view--whiteboard.is-active {
  display: flex;
}

.frq-frq-nav {
  flex-shrink: 0;
  padding: 0.625rem 1rem;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.frq-frq-tabs {
  display: flex;
  gap: 0.375rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.frq-frq-tabs::-webkit-scrollbar {
  height: 4px;
}

.frq-frq-tabs::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 9999px;
}

.frq-frq-tab {
  flex-shrink: 0;
  padding: 0.5rem 0.875rem;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--transition-soft),
    border-color var(--transition-soft),
    color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.frq-frq-tab:hover {
  color: var(--text-color);
  background: var(--bg-hover);
}

.frq-frq-tab.is-active {
  color: var(--accent-text-hover);
  background: var(--accent-tint);
  border-color: var(--accent-border);
  box-shadow: 0 1px 4px var(--accent-shadow);
}

.frq-frq-tab:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

.frq-whiteboard-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0;
  background-color: var(--canvas-bg);
  background-image: var(--bg-pattern);
  background-size: var(--grid-size) var(--grid-size);
}

.frq-whiteboard-stack {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.frq-whiteboard-page {
  flex-shrink: 0;
  width: 100%;
  min-height: 800px;
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
}

.frq-whiteboard-add-wrap {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  width: 100%;
  padding: 1.5rem 1rem 2rem;
  background-color: var(--canvas-bg);
  background-image: var(--bg-pattern);
  background-size: var(--grid-size) var(--grid-size);
}

.frq-whiteboard-add-btn {
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--accent-text-hover);
  background: var(--accent-tint);
  border: 1px solid var(--accent-border);
  border-radius: 12px;
  box-shadow: 0 1px 4px var(--accent-shadow);
  cursor: pointer;
  transition:
    background-color var(--transition-soft),
    border-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.frq-whiteboard-add-btn:hover {
  background: #e4e9ec;
  box-shadow: 0 2px 8px var(--accent-shadow);
}

.frq-whiteboard-add-btn:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

.frq-whiteboard-canvas {
  display: block;
  width: 100%;
  min-height: 800px;
  height: 800px;
  background: #ffffff;
  cursor: crosshair;
  touch-action: none;
}

.frq-scan-dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: calc(100% - 3rem);
  height: calc(100% - 3rem);
  margin: 1.5rem;
  padding: 2rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.92);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-soft);
  box-shadow: var(--shadow-float);
  cursor: pointer;
  transition:
    border-color var(--transition-soft),
    background-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.frq-scan-dropzone:hover {
  border-color: var(--accent-border);
  background: rgba(255, 249, 230, 0.6);
  box-shadow: var(--shadow-float-hover);
}

.frq-scan-dropzone:focus-within {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

.frq-scan-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4.5rem;
  height: 4.5rem;
  color: var(--text-muted);
  background: var(--icon-neutral-bg);
  border-radius: 50%;
  transition:
    color var(--transition-soft),
    background-color var(--transition-soft),
    transform var(--transition-soft);
}

.frq-scan-dropzone:hover .frq-scan-icon {
  color: var(--accent-text);
  background: var(--accent-tint);
  transform: scale(1.05);
}

.frq-scan-icon svg {
  width: 2rem;
  height: 2rem;
}

.frq-scan-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-color);
}

.frq-scan-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.frq-scan-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  width: 100%;
  height: 100%;
  padding: 1.5rem;
  box-sizing: border-box;
}

.frq-scan-preview-img {
  max-width: 100%;
  max-height: calc(100% - 3rem);
  object-fit: contain;
  border-radius: var(--radius-soft);
  box-shadow: var(--shadow-float);
  background: #ffffff;
}

.frq-scan-clear {
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition:
    color var(--transition-soft),
    border-color var(--transition-soft),
    background-color var(--transition-soft);
}

.frq-scan-clear:hover {
  color: var(--text-color);
  border-color: #d4d0c8;
  background: var(--bg-hover);
}

.frq-scan-clear:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .frq-panel-group {
    flex-direction: column;
  }

  .frq-panel--pdf {
    flex: 0 0 auto;
    width: 100% !important;
    height: 45vh;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .frq-panel-resizer {
    display: none;
  }

  .frq-input-toggle {
    padding: 0.625rem 0.875rem;
  }

  .frq-input-tab {
    max-width: none;
  }

  .frq-frq-nav {
    padding: 0.5rem 0.75rem;
  }

  .frq-frq-tab {
    font-size: 0.75rem;
    padding: 0.4375rem 0.75rem;
  }

  .frq-whiteboard-page,
  .frq-whiteboard-canvas {
    min-height: 640px;
    height: 640px;
  }

  .frq-whiteboard-add-wrap {
    padding: 1.25rem 0.75rem 1.5rem;
  }

  .frq-scan-dropzone {
    width: calc(100% - 2rem);
    height: calc(100% - 2rem);
    margin: 1rem;
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .frq-input-tab {
    font-size: 0.8125rem;
    padding: 0.5rem 0.875rem;
  }

  .frq-scan-icon {
    width: 3.5rem;
    height: 3.5rem;
  }

  .frq-scan-icon svg {
    width: 1.625rem;
    height: 1.625rem;
  }
}

/* —— Footer —— */
.site-footer {
  margin-top: auto;
  background: #1a1a1a;
  color: #ffffff;
  padding: 0 0 2.5rem;
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-block);
}

.footer-rule {
  border: none;
  border-top: 1px solid #3d3d3d;
  margin: 0 0 2.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem 3rem;
  margin-bottom: 2.5rem;
}

.footer-wordmark {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.footer-mission {
  font-size: 0.875rem;
  line-height: 1.5;
  color: #a3a3a3;
  max-width: 16rem;
}

.footer-heading {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: #d4d4d4;
  text-decoration: none;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-links a:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

.footer-disclaimer {
  font-size: 0.75rem;
  line-height: 1.5;
  color: #a3a3a3;
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #3d3d3d;
}

#subject-header {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.3;
  color: var(--text-color);
}

#subject-header.is-placeholder {
  font-weight: 400;
  color: var(--text-muted);
}

/* —— Hamburger menu (always hidden on desktop) —— */
.hamburger-btn {
  display: none !important;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: var(--radius-pill);
  background: transparent;
  cursor: pointer;
  overflow: hidden;
  flex-shrink: 0;
  transition:
    background-color var(--transition-soft),
    box-shadow var(--transition-soft);
}

.hamburger-btn:hover {
  background: var(--active-tint);
  box-shadow: var(--shadow-float);
}

.hamburger-btn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.hamburger-icon,
.hamburger-close-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  stroke: var(--text-color);
  pointer-events: none;
}

.hamburger-close-icon {
  display: none;
}

.hamburger-btn[aria-expanded="true"] .hamburger-icon {
  display: none;
}

.hamburger-btn[aria-expanded="true"] .hamburger-close-icon {
  display: block;
}

/* —— Mobile sidebar overlay —— */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-height);
  z-index: 149;
  background: rgba(0, 0, 0, 0.3);
}

.sidebar-overlay.is-visible {
  display: block;
}

@media (max-width: 768px) {
  body {
    display: flex;
    flex-direction: column;
    padding-top: var(--header-height);
  }

  .site-header-inner {
    padding: 0.35rem 1rem 0.45rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.35rem 0.6rem;
    align-items: center;
    align-content: flex-start;
  }

  .header-logo {
    order: 1;
    align-self: center;
  }

  .header-actions {
    order: 2;
    align-self: center;
    display: flex;
    align-items: center;
    min-width: 0;
    margin-top: 5px;
  }

  .header-actions .search-browse {
    display: flex;
    align-items: center;
  }

  .breadcrumb {
    order: 3;
    flex: 0 0 100%;
    justify-content: flex-start;
    align-items: center;
    width: 100%;
    min-height: 0;
    margin-top: -6px;
    margin-bottom: 15px;
    padding: 0;
    gap: 0.2rem 0.35rem;
    font-size: 0.75rem;
    line-height: 1.2;
  }

  .home-page .site-header-inner--launchpad {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .site-header--home .header-center {
    display: none;
  }

  .header-logo {
    font-size: 1rem;
  }

  .breadcrumb-sep {
    line-height: 1;
  }

  .breadcrumb-current {
    text-underline-offset: 2px;
  }

  .search-browse-input:not(.search-browse-input--launchpad) {
    width: 100%;
    max-width: 120px;
    height: 28px;
    padding: 0 0.55rem;
    font-size: 0.8rem;
  }

  .hamburger-btn {
    display: flex !important;
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 280px;
    height: calc(100vh - var(--header-height));
    z-index: 150;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0s 0.25s;
    border-right: 1px solid var(--border-color);
    border-bottom: none;
    overflow: hidden;
    background: var(--bg-sidebar);
  }

  .home-page .sidebar--workspace {
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
  }

  .sidebar.is-open {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.25s ease, visibility 0s 0s;
  }

  .sidebar-nav {
    gap: 0.375rem;
  }

  .nav-btn {
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
  }

  .page {
    margin-left: 0;
    width: 100%;
    flex: 1;
    min-height: 0;
  }

  .content-container {
    padding: 1.25rem;
  }

  .content h1,
  #subject-header,
  .content-container > h1 {
    font-size: 1.375rem;
    letter-spacing: -0.02em;
  }

  .units {
    margin-top: 1.25rem;
  }

  .subject-layout {
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.25rem;
  }

  .subject-layout__main.units {
    flex: 1 1 auto;
    width: 100%;
    margin-top: 0;
  }

  .study-tools {
    flex: 1 1 auto;
    max-width: none;
    width: 100%;
  }

  .units-grid {
    gap: 12px;
  }

  .unit-box summary {
    font-size: 0.875rem;
    padding: 0.875rem 1rem;
  }

  .unit-links {
    padding: 0.625rem 1rem 0.875rem;
  }

  .unit-links a {
    font-size: 0.9375rem;
  }

  .footer-inner {
    padding: 0 1.25rem;
  }

  .footer-rule {
    margin-bottom: 1.75rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
  }

  .footer-mission {
    max-width: none;
  }

  .footer-wordmark {
    font-size: 0.9375rem;
  }

  .footer-heading {
    font-size: 0.75rem;
    margin-bottom: 0.75rem;
  }

  .footer-links a {
    font-size: 0.9375rem;
  }

  .footer-disclaimer {
    font-size: 0.8125rem;
    padding-top: 1.5rem;
  }

  .launchpad {
    padding: 2.25rem 1.25rem 3.5rem;
    min-height: auto;
    max-width: none;
  }

  .launchpad-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .launchpad-headline {
    font-size: 1.625rem;
  }

  .launchpad-search {
    margin-top: 2rem;
    align-items: stretch;
    gap: 1rem;
    width: 100%;
  }

  .search-browse--launchpad {
    display: block;
    width: 100% !important;
    max-width: none !important;
  }

  .search-browse-input--launchpad {
    display: block !important;
    width: 100% !important;
    min-width: 100% !important;
    height: 50px !important;
    padding: 0 1.25rem !important;
    font-size: 1rem !important;
    border-radius: var(--radius-card);
    box-sizing: border-box;
    box-shadow: var(--shadow-float);
  }

  .continue-studying {
    max-width: none;
    margin-top: 1.75rem;
    padding: 1.25rem 1.25rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .continue-studying-btn {
    align-self: flex-start;
  }

  .toolbox {
    max-width: none;
    width: 100%;
    margin-top: 1.75rem;
    margin-bottom: 2rem;
  }

  .toolbox-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .toolbox-card {
    padding: 1.25rem 1.125rem 1.375rem;
  }

  .frq-gateway {
    padding: 1.5rem 1.25rem;
  }

  .frq-gateway-title {
    font-size: 2.25rem;
    margin-bottom: 1.25rem;
  }

  .frq-gateway-topbar-inner {
    padding: 0 1.25rem;
  }

  .frq-gateway-nav .frq-gateway-back {
    display: none;
  }

  .frq-gateway-nav-mobile {
    display: block;
  }

  .frq-gateway-hero {
    margin-bottom: 2rem;
  }

  .frq-gateway-input {
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
  }

  .frq-workspace {
    height: calc(100vh - 64px);
  }

  .frq-setup-back {
    font-size: 0.8125rem;
  }

  .frq-setup-badge {
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
  }

  .launchpad-search-prompt {
    max-width: none;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .search-browse-input:not(.search-browse-input--launchpad) {
    width: 7.5rem;
    padding: 0.4rem 0.5rem;
    font-size: 0.8125rem;
  }

  .toolbox-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 340px) {
  .toolbox-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1440px) {
  html {
    font-size: clamp(17px, 0.28vw + 12.5px, 21px);
  }

  .site-header-inner {
    width: 90%;
    max-width: 1520px;
    margin: 0 auto;
  }

  .search-browse-input:not(.search-browse-input--launchpad) {
    width: clamp(17rem, 14rem + 1.5vw, 24rem);
    padding: clamp(0.72rem, 0.48rem + 0.35vw, 1rem) clamp(1rem, 0.74rem + 0.45vw, 1.4rem);
    font-size: clamp(1rem, 0.86rem + 0.18vw, 1.18rem);
  }

  .search-browse-option,
  .search-browse-empty {
    padding: clamp(0.65rem, 0.55rem + 0.22vw, 0.85rem) clamp(0.95rem, 0.8rem + 0.25vw, 1.2rem);
    font-size: clamp(0.9rem, 0.82rem + 0.14vw, 1rem);
  }

  .page {
    margin-left: clamp(260px, 15vw, 320px);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
  }

  .sidebar {
    width: clamp(260px, 15vw, 320px);
    padding: 0;
  }

  .sidebar-heading {
    font-size: clamp(0.72rem, 0.68rem + 0.08vw, 0.8rem);
    margin-bottom: clamp(0.8rem, 0.65rem + 0.2vw, 1rem);
  }

  .sidebar-nav {
    gap: clamp(0.65rem, 0.48rem + 0.18vw, 0.85rem);
  }

  .sidebar--workspace .sidebar-subjects .sidebar-nav {
    gap: 0.625rem;
  }

  .nav-btn {
    padding: clamp(1.22rem, 1.02rem + 0.42vw, 1.55rem) clamp(1.3rem, 1.05rem + 0.4vw, 1.7rem);
    font-size: clamp(1.08rem, 0.95rem + 0.2vw, 1.25rem);
  }

  .content {
    width: 100%;
    display: flex;
    justify-content: center;
  }

  .content-container {
    width: 90%;
    max-width: 1320px;
    margin: 0 auto;
    padding: clamp(2rem, 1.25rem + 0.95vw, 2.8rem);
  }

  .page--subject .content-container:has(.subject-layout) {
    max-width: 1420px;
  }

  .content > h1,
  .content-container > h1,
  #subject-header {
    font-size: clamp(1.95rem, 1.5rem + 0.65vw, 2.45rem);
    margin-bottom: clamp(0.2rem, 0.1rem + 0.2vw, 0.45rem);
  }

  .units {
    margin-top: clamp(1.8rem, 1.35rem + 0.7vw, 2.4rem);
  }

  .units-grid {
    gap: clamp(1.1rem, 0.85rem + 0.45vw, 1.5rem);
  }

  .unit-box summary {
    padding: clamp(1.15rem, 0.95rem + 0.42vw, 1.5rem) clamp(1.4rem, 1.1rem + 0.4vw, 1.75rem);
    font-size: clamp(1rem, 0.9rem + 0.18vw, 1.12rem);
  }

  .unit-links {
    padding: clamp(0.85rem, 0.72rem + 0.28vw, 1.1rem) clamp(1.4rem, 1.1rem + 0.36vw, 1.7rem)
      clamp(1.1rem, 0.9rem + 0.32vw, 1.35rem);
    gap: clamp(0.55rem, 0.48rem + 0.15vw, 0.7rem);
  }

  .unit-links a {
    font-size: clamp(0.92rem, 0.84rem + 0.14vw, 1.02rem);
  }

  .launchpad {
    width: 90%;
    max-width: 1280px;
    margin: 0 auto;
    padding: clamp(3.5rem, 2.5rem + 1.1vw, 4.5rem) clamp(2.75rem, 2rem + 0.9vw, 3.5rem)
      clamp(5rem, 3.8rem + 1.3vw, 6.2rem);
  }

  .launchpad-headline {
    font-size: clamp(2.2rem, 1.85rem + 0.55vw, 2.7rem);
  }

  .launchpad-search,
  .continue-studying,
  .toolbox {
    max-width: clamp(760px, 64vw, 1080px);
  }

  .launchpad-search {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .launchpad-search-prompt {
    width: 100%;
    max-width: clamp(760px, 64vw, 1080px);
    margin: 0 auto;
    font-size: clamp(1.2rem, 1.03rem + 0.25vw, 1.42rem);
  }

  .search-browse--launchpad {
    width: 100%;
    max-width: clamp(760px, 64vw, 1080px);
    margin: 0 auto;
  }

  .search-browse-input--launchpad {
    width: 100%;
    min-height: clamp(4rem, 3.4rem + 0.7vw, 4.8rem);
    padding: clamp(1.75rem, 1.4rem + 0.4vw, 2.15rem) clamp(2rem, 1.6rem + 0.5vw, 2.5rem);
    font-size: clamp(1.45rem, 1.15rem + 0.35vw, 1.8rem);
    border-radius: var(--radius-card);
  }

  .search-browse-input--launchpad::placeholder {
    font-size: clamp(1.2rem, 1rem + 0.25vw, 1.45rem);
  }

  .continue-studying {
    margin-top: clamp(3rem, 2.4rem + 0.65vw, 3.5rem);
    padding: clamp(2.2rem, 1.7rem + 0.55vw, 2.7rem) clamp(2.5rem, 1.9rem + 0.65vw, 3rem);
    gap: clamp(1.6rem, 1.3rem + 0.3vw, 1.9rem);
  }

  .continue-studying-subject {
    font-size: clamp(1.12rem, 1rem + 0.22vw, 1.3rem);
  }

  .continue-studying-subtitle {
    font-size: clamp(0.85rem, 0.78rem + 0.12vw, 0.95rem);
  }

  .continue-studying-btn {
    padding: clamp(0.78rem, 0.6rem + 0.2vw, 0.96rem) clamp(1.5rem, 1.18rem + 0.38vw, 1.9rem);
    font-size: clamp(0.96rem, 0.82rem + 0.16vw, 1.1rem);
  }

  .toolbox {
    margin-top: clamp(2.8rem, 2.2rem + 0.75vw, 3.4rem);
  }

  .toolbox-grid {
    gap: clamp(1rem, 0.7rem + 0.4vw, 1.35rem);
    grid-template-columns: repeat(auto-fill, minmax(clamp(200px, 11vw, 240px), 1fr));
  }

  .toolbox-card {
    padding: clamp(1.45rem, 1.2rem + 0.3vw, 1.75rem) clamp(1.3rem, 1.1rem + 0.25vw, 1.55rem)
      clamp(1.55rem, 1.25rem + 0.32vw, 1.85rem);
  }

  .toolbox-card-title {
    font-size: clamp(0.92rem, 0.83rem + 0.12vw, 1rem);
  }

  .toolbox-card-desc {
    font-size: clamp(0.8rem, 0.72rem + 0.1vw, 0.88rem);
  }

  .toolbox-card-action {
    padding: clamp(0.42rem, 0.35rem + 0.1vw, 0.52rem) clamp(1.05rem, 0.9rem + 0.2vw, 1.25rem);
    font-size: clamp(0.78rem, 0.7rem + 0.1vw, 0.86rem);
  }

  .site-footer {
    width: 100%;
    align-self: stretch;
  }

  .site-footer .footer-inner {
    width: 100%;
    max-width: none;
    margin: 0;
    padding-left: clamp(2rem, 4vw, 4rem);
    padding-right: clamp(2rem, 4vw, 4rem);
  }

  /* Desktop corrective overrides: standard container + full-bleed footer */
  .page--subject {
    margin-left: 0;
  }

  .content-container,
  .launchpad {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
  }

  .launchpad-search,
  .continue-studying,
  .toolbox,
  .launchpad-search-prompt,
  .search-browse--launchpad {
    width: 100%;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
  }

  .search-browse-input--launchpad {
    width: 100%;
    padding: clamp(1.95rem, 1.55rem + 0.5vw, 2.45rem)
      clamp(2.2rem, 1.75rem + 0.6vw, 2.85rem);
    font-size: clamp(1.5rem, 1.2rem + 0.35vw, 1.85rem);
  }

  .site-footer {
    width: 100vw;
    max-width: none;
    align-self: stretch;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
  }

  .site-footer .footer-inner {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding-left: clamp(1.5rem, 3vw, 2.5rem);
    padding-right: clamp(1.5rem, 3vw, 2.5rem);
  }
}

/* ============================================================
   Dashboard — full mockup reproduction (scoped to .home-page)
   ============================================================ */

.home-page .page--dashboard {
  position: relative;
  min-height: 100vh;
  background: var(--dashboard-bg);
  overflow: visible;
  display: flex;
  flex-direction: column;
}

.home-page .site-footer {
  position: relative;
  z-index: 10;
  width: 100%;
  margin-top: var(--dashboard-footer-gap);
}

.home-page .site-footer .footer-inner {
  padding-left: var(--dashboard-left-offset);
  padding-right: clamp(1.5rem, 3vw, 2.5rem);
}

/* —— Sidebar surfaces —— */
.home-page .sidebar--workspace {
  background: #f9f8f7;
  border-right: 1px solid #eae5da;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Subjects keep their natural height (never collapse) while the bottom
   block stays pinned when there is room; the sidebar scrolls only if the
   viewport is too short to fit everything. */
.home-page .sidebar-subjects {
  flex: 1 0 auto;
  overflow: visible;
}

.home-page .subjects-list {
  overflow: visible;
  max-height: none;
}

/* —— Logo lockup with tree mark + tagline —— */
.home-page .sidebar-top {
  padding: 1.35rem 0.875rem 0;
}

.home-page .sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 0.65rem;
  padding: 0 0.5rem;
}

.home-page .sidebar-logo-mark {
  display: block;
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  object-fit: contain;
}

.home-page .sidebar-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.12;
}

.home-page .sidebar-logo-name {
  font-size: 1.3125rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #2d2a45;
}

.home-page .sidebar-logo-name .logo-ap {
  color: #2d2a45;
}

.home-page .sidebar-logo-tag {
  margin-top: 3px;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.005em;
  color: var(--text-muted);
}

.home-page .sidebar-logo:hover {
  text-decoration: none;
}

/* —— Workspace nav with leading icons —— */
.home-page .sidebar-heading {
  padding: 0 0.5rem;
  margin-bottom: 0.5rem;
}

.home-page .sidebar-nav--workspace {
  gap: 0.125rem;
}

.home-page .nav-btn--icon {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #4a4754;
  border-radius: 10px;
  box-shadow: none;
}

.home-page .nav-btn-icon {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  color: #8b8898;
}

.home-page .nav-btn--icon:hover {
  background: var(--active-tint);
  color: #2d2a45;
  font-weight: 500;
  box-shadow: none;
}

.home-page .nav-btn--icon.is-active {
  background: var(--accent-bg-soft);
  color: #3a3358;
  font-weight: 600;
  box-shadow: none;
}

.home-page .nav-btn--icon.is-active .nav-btn-icon {
  color: var(--accent-text);
}

/* —— Subjects list (compact, enamel dots) —— */
.home-page .sidebar-subjects {
  padding: 0.6rem 0.875rem 0.4rem;
}

.home-page .sidebar-subjects .nav-btn {
  padding: 0.5rem 0.75rem 0.5rem 1.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #4a4754;
  border-radius: 10px;
  box-shadow: none;
}

.home-page .sidebar-subjects .nav-btn::after {
  left: 0.8rem;
}

.home-page .sidebar-subjects .nav-btn:hover {
  background: var(--active-tint);
  color: #2d2a45;
  font-weight: 500;
  box-shadow: none;
}

.home-page .sidebar-action-link {
  padding: 0.45rem 0.75rem;
}

/* —— Premium card —— */
.home-page .sidebar-bottom {
  padding: 0.55rem 0.875rem 0.85rem;
}

.home-page .sidebar-premium {
  position: relative;
  background: #f7f2eb;
  border: 1px solid #ebe4d9;
  padding: 1.2rem 1rem 1.1rem;
  margin-bottom: 0.75rem;
  border-radius: 14px;
  box-shadow: none;
}

.home-page .sidebar-premium-desc {
  margin-bottom: 0.85rem;
  font-size: 0.6875rem;
  line-height: 1.5;
}

.home-page .sidebar-premium-icon {
  position: absolute;
  top: 1.15rem;
  left: 1rem;
  width: 1.1rem;
  height: 1.1rem;
  color: #d9962f;
}

.home-page .sidebar-premium-icon svg {
  width: 100%;
  height: 100%;
}

.home-page .sidebar-premium-title {
  padding-left: 1.55rem;
  margin-bottom: 0.35rem;
  font-size: 0.875rem;
  color: var(--accent-text-hover);
}

.home-page .sidebar-premium-btn {
  height: 38px;
  font-size: 0.8125rem;
  background: #3a4568;
  box-shadow: 0 2px 8px rgba(58, 69, 104, 0.22);
}

.home-page .sidebar-premium-btn:hover {
  background: #2f3854;
  box-shadow: 0 4px 12px rgba(58, 69, 104, 0.28);
}

/* —— Profile with caret —— */
.home-page .sidebar-profile {
  gap: 0.6rem;
}

.home-page .sidebar-profile-caret {
  width: 1rem;
  height: 1rem;
  margin-left: auto;
  flex-shrink: 0;
  color: var(--text-muted);
}

/* —— Main canvas + tree —— */
.home-page .launchpad {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: var(--dashboard-top-offset) 2rem 2rem var(--dashboard-left-offset);
  overflow: visible;
}

.home-page .launchpad-hero {
  position: relative;
  z-index: 20;
  width: 100%;
  max-width: var(--dashboard-ui-max-width);
  pointer-events: none;
}

.home-page .launchpad-hero > * {
  pointer-events: auto;
}

/* Tree scene — hills pull up behind continue card; Quick Access sits below */
.home-page .dashboard-tree-scene {
  position: relative;
  width: 100%;
  height: var(--dashboard-scene-height);
  margin-top: -6.75rem;
  flex-shrink: 0;
  overflow: visible;
  pointer-events: none;
  z-index: 5;
}

.home-page .dashboard-tree-wrap {
  position: absolute;
  right: -2rem;
  bottom: 0;
  width: min(98%, 1180px);
  height: clamp(740px, 84vh, 1100px);
  max-height: calc(100vh - var(--dashboard-top-offset) - 10rem);
  pointer-events: none;
  overflow: visible;
}

.home-page .dashboard-tree {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: bottom right;
  transform: translateX(-3%) translateY(-2.75rem);
  pointer-events: none;
  user-select: none;
}

/* Hero block — compressed width like target mockup */
.home-page .launchpad-header,
.home-page .launchpad-search {
  position: relative;
  z-index: 30;
  width: 100%;
  max-width: var(--dashboard-hero-width);
  pointer-events: auto;
}

.home-page .continue-studying {
  position: relative;
  z-index: 20;
  width: 100%;
  max-width: var(--dashboard-continue-width);
  pointer-events: auto;
}

.home-page .search-browse--launchpad {
  position: relative;
  z-index: 30;
  width: 100%;
  max-width: none;
  pointer-events: auto;
}

.home-page .launchpad-header {
  display: block;
  margin-bottom: 0.35rem;
}

.home-page .launchpad-headline {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: clamp(2.5rem, 2rem + 1.6vw, 3.4rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.05;
  color: #2d2a45;
}

/* —— Prompt + search —— */
.home-page .launchpad-search {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  margin-top: 2.75rem;
  gap: 0.75rem;
  flex: none;
}

.home-page .launchpad-search-prompt {
  width: 100%;
  max-width: none;
  margin: 0;
  font-size: 1.0625rem;
  color: var(--text-muted);
  text-align: left;
}

.home-page .search-browse--launchpad {
  width: 100%;
  max-width: none;
}

.home-page .search-browse-icon {
  position: absolute;
  top: 50%;
  left: 1.45rem;
  z-index: 2;
  width: 1.35rem;
  height: 1.35rem;
  color: #a8a5b3;
  pointer-events: none;
  transform: translateY(-50%);
}

.home-page .search-browse-input--launchpad {
  min-height: 86px;
  padding: 1.75rem 1.85rem 1.75rem 3.4rem;
  font-size: 1.08rem;
  border-radius: var(--radius-card);
  border-color: var(--surface-border);
  box-shadow:
    0 1px 2px rgba(45, 42, 69, 0.04),
    0 4px 14px rgba(45, 42, 69, 0.05);
}

.home-page .search-browse-input--launchpad::placeholder {
  font-size: 1.08rem;
  color: #a8a5b3;
}

.home-page .search-browse--launchpad.is-open .search-browse-input--launchpad,
.home-page .search-browse-input--launchpad:focus {
  outline: none;
  box-shadow:
    0 1px 2px rgba(45, 42, 69, 0.04),
    0 6px 18px rgba(45, 42, 69, 0.07);
}

.home-page .search-browse-list--launchpad {
  z-index: 25;
  border-radius: 0 0 var(--radius-card) var(--radius-card);
}

/* —— Continue studying —— */
.home-page .continue-studying {
  margin: 1.9rem 0 0;
  padding: 1.75rem 1.85rem;
  border-radius: 20px;
  box-shadow:
    0 1px 2px rgba(45, 42, 69, 0.04),
    0 6px 18px rgba(45, 42, 69, 0.05);
}

.home-page .continue-studying-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 14px;
  background: #ece7f8;
  font-size: 1.35rem;
  opacity: 1;
  filter: none;
}

.home-page .continue-studying-subject {
  font-size: 1.125rem;
  color: #2d2a45;
}

.home-page .continue-studying-btn {
  padding: 0.7rem 1.65rem;
  font-size: 0.95rem;
  background: var(--accent-primary-dark);
  border-radius: 9999px;
  box-shadow: 0 4px 14px rgba(123, 107, 181, 0.28);
}

.home-page .continue-studying-btn:hover {
  background: var(--accent-text-hover);
  box-shadow: 0 6px 18px rgba(72, 61, 120, 0.3);
}

/* —— Quick Access (full width, below tree hills) —— */
.home-page .toolbox {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: none;
  margin: -2.75rem 0 0;
  padding: 0.25rem 0 0;
  pointer-events: auto;
  flex-shrink: 0;
}

.home-page .toolbox-heading {
  position: relative;
  z-index: 10;
  margin-bottom: 1.15rem;
  font-family: "Inter", -apple-system, sans-serif;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.home-page .toolbox-grid {
  --toolbox-gap: clamp(1.25rem, 2vw, 2rem);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--toolbox-gap);
  width: 100%;
}

.home-page .toolbox-card {
  position: relative;
  z-index: 10;
  gap: 0.55rem;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  pointer-events: auto;
}

@media (min-width: 900px) {
  .home-page .toolbox-card + .toolbox-card::before {
    content: "";
    position: absolute;
    left: calc(var(--toolbox-gap) / -2);
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 4.75rem;
    background-color: #e5e2de;
    pointer-events: none;
  }
}

.home-page .toolbox-card:hover {
  transform: none;
  box-shadow: none;
}

.home-page .toolbox-card-title {
  font-size: 0.875rem;
  color: #2d2a45;
}

.home-page .toolbox-card-desc {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.home-page .toolbox-card-action {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.15rem;
  padding: 0;
  font-size: 0.78rem;
  font-weight: 600;
  background: transparent;
  box-shadow: none;
  color: var(--accent-text);
}

.home-page .toolbox-card:hover .toolbox-card-action {
  background: transparent;
  box-shadow: none;
}

.home-page .toolbox-card-arrow {
  transition: transform 0.2s ease;
}

.home-page .toolbox-card:hover .toolbox-card-arrow {
  transform: translateX(3px);
}

/* Per-tool icon + link colors */
.home-page .toolbox-grid > .toolbox-card:nth-child(4) .toolbox-card-icon-wrap {
  background: #f6dcc0;
  color: #9a5a1c;
  box-shadow: 0 4px 14px rgba(154, 90, 28, 0.18);
}

.home-page .toolbox-grid > .toolbox-card:nth-child(1) .toolbox-card-action {
  color: #6f5cb0;
}

.home-page .toolbox-grid > .toolbox-card:nth-child(2) .toolbox-card-action {
  color: #2f8f5b;
}

.home-page .toolbox-grid > .toolbox-card:nth-child(3) .toolbox-card-action {
  color: #2f79c0;
}

.home-page .toolbox-grid > .toolbox-card:nth-child(4) .toolbox-card-action {
  color: #c47a2c;
}

/* Hide tree where it would crowd the content column */
@media (max-width: 899px) {
  .home-page .dashboard-tree-scene {
    display: none;
  }
}

@media (min-width: 900px) {
  .home-page .toolbox-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .home-page .launchpad {
    max-width: none;
    padding: 2.25rem 1.25rem 3rem;
  }

  .home-page .launchpad-header,
  .home-page .launchpad-search,
  .home-page .search-browse--launchpad,
  .home-page .continue-studying,
  .home-page .toolbox {
    max-width: none;
  }

  .home-page .search-browse-input--launchpad {
    height: 52px !important;
    padding: 0 1.25rem 0 3rem !important;
    font-size: 1rem !important;
  }

  .home-page .toolbox-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem 1.25rem;
  }
}

/* Prevent generic 1440px launchpad rules from overriding dashboard mockup */
@media (min-width: 1440px) {
  .home-page .content {
    justify-content: flex-start;
    width: 100%;
  }

  .home-page .launchpad {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: var(--dashboard-top-offset) 2rem 2.5rem var(--dashboard-left-offset);
    min-height: auto;
    align-items: flex-start;
  }

  .home-page .launchpad-hero {
    max-width: var(--dashboard-ui-max-width);
  }

  .home-page .launchpad-header,
  .home-page .launchpad-search {
    max-width: var(--dashboard-hero-width);
    margin-left: 0;
    margin-right: 0;
  }

  .home-page .continue-studying {
    max-width: var(--dashboard-continue-width);
    margin-left: 0;
    margin-right: 0;
  }

  .home-page .search-browse--launchpad,
  .home-page .launchpad-search-prompt {
    max-width: none;
    margin-left: 0;
    margin-right: 0;
  }

  .home-page .toolbox {
    max-width: none;
    width: 100%;
    margin-left: 0;
    margin-right: 0;
  }

  .home-page .dashboard-tree-scene {
    height: var(--dashboard-scene-height);
    margin-top: -6.75rem;
  }

  .home-page .dashboard-tree-wrap {
    width: min(100%, 1220px);
    height: clamp(780px, 86vh, 1140px);
    max-height: calc(100vh - var(--dashboard-top-offset) - 10rem);
    right: -2.5rem;
  }

  .home-page .dashboard-tree {
    transform: translateX(-3%) translateY(-2.75rem);
  }

  .home-page .launchpad-search {
    align-items: stretch;
    justify-content: flex-start;
  }

  .home-page .launchpad-search-prompt {
    font-size: 1.0625rem;
    margin: 0;
  }

  .home-page .search-browse-input--launchpad {
    min-height: 86px;
    padding: 1.75rem 1.85rem 1.75rem 3.4rem;
    font-size: 1.08rem;
    border-radius: var(--radius-card);
  }

  .home-page .search-browse-input--launchpad::placeholder {
    font-size: 1.08rem;
  }

  .home-page .launchpad-headline {
    font-size: clamp(2.5rem, 2rem + 1.6vw, 3.4rem);
  }

  .home-page .site-footer {
    width: 100%;
    margin-left: 0;
    margin-right: 0;
  }

  .home-page .site-footer .footer-inner {
    max-width: none;
    margin: 0;
  }
}