/* ============================================================
   StudyKarle — Global Stylesheet
   Author: Nitish Kumar
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  /* Brand */
  --accent:        #2563EB;
  --accent-soft:   #EFF6FF;
  --accent-hover:  #1D4ED8;

  /* Backgrounds */
  --bg:            #F8FAFC;
  --bg-card:       #FFFFFF;
  --bg-hover:      #F1F5F9;
  --bg-input:      #FFFFFF;

  /* Text */
  --text-primary:  #0F172A;
  --text-secondary:#475569;
  --text-muted:    #94A3B8;
  --text-inverse:  #FFFFFF;

  /* Borders */
  --border:        #E2E8F0;
  --border-focus:  #2563EB;

  /* Shadows */
  --shadow-xs:     0 1px 2px rgba(0,0,0,.05);
  --shadow-sm:     0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:     0 4px 6px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg:     0 10px 15px rgba(0,0,0,.05), 0 4px 6px rgba(0,0,0,.03);

  /* Radius */
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  14px;
  --r-xl:  18px;
  --r-2xl: 24px;

  /* Spacing */
  --header-h: 60px;

  /* Category colors */
  --cat-notes:      #2563EB;
  --cat-pyq:        #DC2626;
  --cat-assignment: #D97706;
  --cat-tutorial:   #059669;
  --cat-paper:      #7C3AED;

  /* Transitions */
  --ease: cubic-bezier(.22,.68,0,1.2);
  --t: 180ms;
}

[data-theme="dark"] {
  --accent:        #3B82F6;
  --accent-soft:   #1E3A5F;
  --accent-hover:  #60A5FA;

  --bg:            #0B0F19;
  --bg-card:       #131929;
  --bg-hover:      #1A2238;
  --bg-input:      #1A2238;

  --text-primary:  #F1F5F9;
  --text-secondary:#94A3B8;
  --text-muted:    #475569;
  --text-inverse:  #0F172A;

  --border:        #1E2D45;
  --border-focus:  #3B82F6;

  --shadow-xs:     0 1px 2px rgba(0,0,0,.3);
  --shadow-sm:     0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --shadow-md:     0 4px 6px rgba(0,0,0,.3), 0 2px 4px rgba(0,0,0,.25);
  --shadow-lg:     0 10px 15px rgba(0,0,0,.3), 0 4px 6px rgba(0,0,0,.2);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Sora', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--t), color var(--t);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

/* ============================================================
   LAYOUT
   ============================================================ */

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  transition: background var(--t), border-color var(--t);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  flex-shrink: 0;
}

.logo-mark {
  width: 30px;
  height: 30px;
  background: var(--accent);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
}

.logo .logo-name span { color: var(--accent); }

.logo-by {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.header-search {
  flex: 1;
  max-width: 400px;
  margin-left: auto;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background var(--t), border-color var(--t), color var(--t);
}

.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Auth Actions */
.auth-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.auth-login-btn {
  height: 36px;
  padding: 0 16px;
}

.auth-user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.auth-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.auth-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  max-width: 140px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ============================================================
   SEARCH
   ============================================================ */

.search-wrap {
  position: relative;
  width: 100%;
}

.search-wrap svg.search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 38px;
  padding: 0 36px 0 36px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  transition: border-color var(--t), box-shadow var(--t), background var(--t);
  outline: none;
}

.search-input::placeholder { color: var(--text-muted); }
.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

/* ============================================================
   AUTH PAGE
   ============================================================ */

.auth-main {
  padding: 36px 0 64px;
}

.auth-hero {
  text-align: center;
  margin-bottom: 28px;
}

.auth-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 99px;
  margin-bottom: 12px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.auth-title {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  font-weight: 700;
  color: var(--text-primary);
}

.auth-title span { color: var(--accent); }

.auth-sub {
  max-width: 560px;
  margin: 10px auto 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  align-items: start;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.auth-card-head h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.auth-card-head p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
}

.auth-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.auth-input {
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color var(--t), box-shadow var(--t), background var(--t);
  outline: none;
}

.auth-input::placeholder { color: var(--text-muted); }
.auth-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.auth-submit {
  width: 100%;
  justify-content: center;
  margin-top: 4px;
}

.auth-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.auth-disclaimer {
  margin-top: 18px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.search-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text-muted);
  color: white;
  font-size: 0.7rem;
  display: none;
  align-items: center;
  justify-content: center;
}
.search-clear.visible { display: flex; }

/* Search Results Dropdown */
.search-results-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  max-height: 340px;
  overflow-y: auto;
  display: none;
  z-index: 200;
}

.search-results-dropdown.open { display: block; }
.search-result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background var(--t);
}
.search-result-item:hover { background: var(--bg-hover); }
.search-result-item + .search-result-item { border-top: 1px solid var(--border); }

.sri-icon {
  width: 34px;
  height: 34px;
  background: var(--accent-soft);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.85rem;
}

.sri-text { flex: 1; min-width: 0; }
.sri-title { font-size: 0.875rem; font-weight: 500; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sri-meta  { font-size: 0.75rem; color: var(--text-muted); margin-top: 1px; }
.sri-badge { flex-shrink: 0; }

.search-empty {
  padding: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ============================================================
   MAIN / PAGES
   ============================================================ */

main { min-height: calc(100vh - var(--header-h) - 60px); }

.page { display: none; }
.page.active { display: block; }

/* ============================================================
   BREADCRUMBS
   ============================================================ */

.breadcrumbs {
  padding: 14px 0 0;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.breadcrumbs a {
  color: var(--accent);
  transition: opacity var(--t);
}
.breadcrumbs a:hover { opacity: .75; }
.breadcrumbs .sep { color: var(--border); }
.breadcrumbs .current { color: var(--text-secondary); font-weight: 500; }

/* ============================================================
   HERO (LANDING)
   ============================================================ */

.hero {
  padding: 56px 0 32px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 99px;
  margin-bottom: 18px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(1.85rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.18;
  color: var(--text-primary);
  letter-spacing: -.02em;
  max-width: 600px;
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-sub {
  margin-top: 14px;
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  line-height: 1.65;
}

.hero-cta {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 20px;
  height: 42px;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background var(--t), transform var(--t), box-shadow var(--t), color var(--t), border-color var(--t);
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 1px 3px rgba(37,99,235,.3);
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(37,99,235,.35);
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}
.btn-outline:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.btn-sm {
  height: 34px;
  padding: 0 14px;
  font-size: 0.82rem;
}

.btn-icon {
  width: 42px;
  padding: 0;
  justify-content: center;
}

.btn-download {
  background: var(--accent);
  color: white;
}
.btn-download:hover { background: var(--accent-hover); }

.btn-share {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn-share:hover { color: var(--text-primary); }

/* ============================================================
   FEATURE STRIP
   ============================================================ */

.feature-strip {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 32px 0 44px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-xs);
}

.feature-item span { font-size: 1rem; }

/* ============================================================
   SECTION TITLES
   ============================================================ */

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.01em;
}

.section-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ============================================================
   YEAR CARDS
   ============================================================ */

.year-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
  margin-bottom: 48px;
}

.year-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 22px;
  cursor: pointer;
  transition: transform var(--t), box-shadow var(--t), border-color var(--t);
  position: relative;
  overflow: hidden;
}

.year-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--t);
}

.year-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.year-card:hover::before { opacity: 1; }

.yc-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--r-md);
  font-size: 0.8rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 14px;
}

.yc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 5px;
}

.yc-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.yc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.yc-count {
  background: var(--bg-hover);
  padding: 3px 9px;
  border-radius: 99px;
  font-weight: 500;
}

/* ============================================================
   SEMESTER SELECTOR
   ============================================================ */

.page-header {
  padding: 24px 0 20px;
}

.page-header-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text-primary);
}

.page-header-sub {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.sem-tabs {
  display: flex;
  gap: 8px;
  margin: 16px 0 24px;
  flex-wrap: wrap;
}

.sem-tab {
  padding: 8px 18px;
  border: 1.5px solid var(--border);
  border-radius: 99px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card);
  transition: background var(--t), border-color var(--t), color var(--t);
}

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

.sem-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ============================================================
   SUBJECT CARDS
   ============================================================ */

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 36px;
}

.subject-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 18px;
  cursor: pointer;
  transition: transform var(--t), box-shadow var(--t), border-color var(--t), background var(--t);
}

.subject-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.sc-icon {
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.sc-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.sc-count {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ============================================================
   RESOURCE LIST
   ============================================================ */

.resource-filters {
  display: flex;
  gap: 7px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.filter-chip {
  padding: 5px 13px;
  border: 1.5px solid var(--border);
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  transition: background var(--t), border-color var(--t), color var(--t);
}

.filter-chip:hover { background: var(--bg-hover); color: var(--text-primary); }
.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.resource-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 40px;
}

.resource-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 14px 16px;
  transition: box-shadow var(--t), border-color var(--t), background var(--t);
  cursor: pointer;
}

.resource-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent);
}

.rc-file-icon {
  width: 42px;
  height: 42px;
  background: var(--accent-soft);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
  color: var(--accent);
}

.rc-info { flex: 1; min-width: 0; }

.rc-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rc-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  flex-wrap: wrap;
}

.rc-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.cat-notes      { background: #EFF6FF; color: #2563EB; }
.cat-pyq        { background: #FEF2F2; color: #DC2626; }
.cat-assignment { background: #FFFBEB; color: #D97706; }
.cat-tutorial   { background: #ECFDF5; color: #059669; }
.cat-paper      { background: #F5F3FF; color: #7C3AED; }

[data-theme="dark"] .cat-notes      { background: #1E3A5F; color: #60A5FA; }
[data-theme="dark"] .cat-pyq        { background: #3B1212; color: #F87171; }
[data-theme="dark"] .cat-assignment { background: #3B2A05; color: #FCD34D; }
[data-theme="dark"] .cat-tutorial   { background: #052E16; color: #34D399; }
[data-theme="dark"] .cat-paper      { background: #2E1A4A; color: #A78BFA; }

.rc-type {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
}

.rc-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

/* ============================================================
   RESOURCE VIEWER PAGE
   ============================================================ */

.viewer-header {
  padding: 20px 0 16px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex-wrap: wrap;
}

.viewer-info { flex: 1; min-width: 0; }

.viewer-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 6px;
}

.viewer-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.viewer-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.viewer-frame-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
  margin-bottom: 32px;
  min-height: 500px;
  position: relative;
}

.viewer-iframe {
  width: 100%;
  height: 75vh;
  min-height: 500px;
  border: none;
  display: block;
}

.viewer-img {
  width: 100%;
  max-height: 80vh;
  object-fit: contain;
  display: block;
  padding: 20px;
}

.viewer-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 300px;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
}

.viewer-error-icon { font-size: 2.5rem; }
.viewer-error h3 { font-size: 1rem; font-weight: 600; color: var(--text-secondary); }
.viewer-error p { font-size: 0.875rem; max-width: 340px; }

/* ============================================================
   EMPTY / ERROR STATES
   ============================================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 56px 20px;
  text-align: center;
  color: var(--text-muted);
}

.empty-icon { font-size: 2.5rem; }
.empty-title { font-size: 1rem; font-weight: 600; color: var(--text-secondary); }
.empty-desc  { font-size: 0.875rem; max-width: 320px; line-height: 1.6; }

/* ============================================================
   SETTINGS PAGE
   ============================================================ */

.settings-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  margin-bottom: 18px;
  overflow: hidden;
}

.settings-section-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  gap: 16px;
}

.settings-row + .settings-row {
  border-top: 1px solid var(--border);
}

.settings-row-label { font-size: 0.9rem; font-weight: 500; color: var(--text-primary); }
.settings-row-desc  { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* Toggle Switch */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 99px;
  transition: background var(--t);
  cursor: pointer;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform var(--t);
  box-shadow: var(--shadow-sm);
}

.toggle input:checked + .toggle-slider { background: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(20px); }

/* About section */
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 24px 20px;
  text-align: center;
}

.about-logo {
  width: 48px;
  height: 48px;
  background: var(--accent);
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 auto 14px;
}

.about-name { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.about-version { font-size: 0.78rem; color: var(--text-muted); margin-top: 3px; }
.about-desc { font-size: 0.875rem; color: var(--text-secondary); margin: 12px 0; line-height: 1.6; max-width: 380px; margin-left: auto; margin-right: auto; }

/* ============================================================
   TOAST
   ============================================================ */

#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--text-primary);
  color: var(--bg);
  border-radius: var(--r-lg);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toast-in .22s var(--ease), toast-out .22s var(--ease) forwards;
  animation-delay: 0s, 2.8s;
  min-width: 200px;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px) scale(.95); }
  to   { opacity: 1; transform: none; }
}
@keyframes toast-out {
  to { opacity: 0; transform: translateY(8px) scale(.95); }
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: opacity var(--t);
}
.site-footer a:hover { opacity: .75; }

/* ============================================================
   SEARCH PAGE (full)
   ============================================================ */

.search-page-bar {
  margin: 24px 0 20px;
}

.search-page-bar .search-wrap { max-width: 100%; }
.search-page-bar .search-input { height: 48px; font-size: 1rem; padding-left: 44px; }
.search-page-bar .search-wrap svg.search-icon { width: 20px; height: 20px; left: 14px; }

.search-stats {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ============================================================
   NAV BOTTOM (Mobile)
   ============================================================ */

.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 8px 0 max(8px, env(safe-area-inset-bottom));
}

.bottom-nav-inner {
  display: flex;
  justify-content: space-around;
}

.bnav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 4px 16px;
  color: var(--text-muted);
  transition: color var(--t);
  font-size: 0.65rem;
  font-weight: 500;
}

.bnav-item.active { color: var(--accent); }

.bnav-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .hero { padding: 32px 0 20px; }
  .hero-title { font-size: 1.65rem; }
  .hero-sub { font-size: 0.95rem; }
  .feature-strip { gap: 8px; }
  .feature-item { padding: 8px 12px; font-size: 0.8rem; }
  .year-cards { grid-template-columns: 1fr 1fr; }
  .subject-grid { grid-template-columns: 1fr 1fr; }
  .rc-actions { display: none; }
  .resource-card:active .rc-actions { display: flex; }
  .bottom-nav { display: block; }
  main { padding-bottom: 72px; }
  .viewer-frame-wrap { border-radius: var(--r-lg); }
  .viewer-iframe { height: 65vh; }
  .header-search { display: none; }
  #toast-container { bottom: 80px; right: 12px; left: 12px; }
  .toast { justify-content: center; }
  .auth-main { padding: 28px 0 56px; }
  .auth-name { display: none; }
}

@media (max-width: 480px) {
  .year-cards { grid-template-columns: 1fr; }
  .subject-grid { grid-template-columns: 1fr; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .year-cards { grid-template-columns: 1fr 1fr; }
  .subject-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

.fade-up {
  animation: fadeUp .3s var(--ease) both;
}

.stagger > * {
  animation: fadeUp .3s var(--ease) both;
}
.stagger > *:nth-child(1)  { animation-delay: .04s; }
.stagger > *:nth-child(2)  { animation-delay: .08s; }
.stagger > *:nth-child(3)  { animation-delay: .12s; }
.stagger > *:nth-child(4)  { animation-delay: .16s; }
.stagger > *:nth-child(5)  { animation-delay: .20s; }
.stagger > *:nth-child(6)  { animation-delay: .24s; }
.stagger > *:nth-child(7)  { animation-delay: .28s; }
.stagger > *:nth-child(8)  { animation-delay: .32s; }

/* ============================================================
   OTP VERIFICATION STYLES
   Added for: OTP step 2 on signup card
   ============================================================ */

/* Info bar that shows which email OTP was sent to */
.otp-info-bar {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--r-md);
  padding: 10px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  margin-top: 16px;
  margin-bottom: 4px;
}

/* Large centered OTP input field */
.otp-input-field {
  letter-spacing: 0.35em;
  font-size: 1.2rem !important;
  font-weight: 700;
  text-align: center;
}

/* Countdown timer text */
.otp-timer {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: -4px;
}

/* Timer text turns red when time is running low (<60 s) */
.otp-timer.urgent {
  color: #DC2626;
  font-weight: 600;
}

/* Row of Resend / Cancel buttons below the OTP input */
.otp-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2px;
}

/* Plain text button (link style) */
.btn-link {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--t);
}
.btn-link:hover:not(:disabled) { opacity: 0.75; text-decoration: underline; }
.btn-link:disabled { color: var(--text-muted); cursor: not-allowed; }

/* Danger link (for Cancel button) */
.btn-link.danger { color: #DC2626; }
.btn-link.danger:hover { opacity: 0.75; }

/* Smooth slide-in animation when OTP step appears */
#signup-step-2 {
  animation: fadeUp 0.25s var(--ease) both;
}

/* ============================================================
   CLEAN AUTH HEADER — auth page has no user-menu clutter
   (login page shows no auth buttons in header at all)
   ============================================================ */

/* On auth pages, make sure the header stays minimal */
.auth-body .site-header .header-actions {
  margin-left: auto;
}