/* learners.css — apaslearners.com design system
   Imports: auth.css (base tokens)
   Fonts: Inter (body) + DM Serif Display (headings)
*/
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Inter:wght@300;400;500;600&display=swap');

:root {
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'Inter', system-ui, sans-serif;

  /* Subject colors */
  --physics:   #4ecdc4;
  --math:      #ffd166;
  --chemistry: #f5a623;
  --biology:   #6bcb77;
  --vedic:     #e8a0d0;
  --language:  #9d8aff;

  /* Backgrounds */
  --bg:        #0a0c0f;
  --surface:   #111418;
  --surface2:  #161b22;
  --border:    #1c2128;
  --border2:   #252d38;

  /* Text hierarchy */
  --t1: #ffffff;
  --t2: #e8ecf0;
  --t3: #c8d8ff;
  --t4: #a0b4c8;
  --t5: #7a9ab8;
  --t6: #3d5470;

  /* Accent */
  --accent:       #ffd166;
  --accent-dim:   #2a2000;
  --accent-border:#3d3000;

  /* Layout */
  --topbar-h:    52px;
  --sidebar-w:   260px;
  --tab-bar-h:   60px;
  --content-max: 860px;
  --ease:        0.16s ease;
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   14px;
}

[data-theme="light"] {
  --bg: #f4f6f9; --surface: #ffffff; --surface2: #f0f2f6;
  --border: #dde3ed; --border2: #c8d0de;
  --t1: #0d1117; --t2: #1c2333; --t3: #2d4a7a;
  --t4: #4a6080; --t5: #6a80a0; --t6: #9aabbc;
  --accent-dim: #fffbe6; --accent-border: #ffe066;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  font-family: var(--font-body);
  background: var(--bg); color: var(--t2);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; }

/* ── Layout ── */
.learn-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas: "sidebar topbar" "sidebar content";
  min-height: 100vh;
}
.learn-layout.no-sidebar {
  grid-template-columns: 1fr;
  grid-template-areas: "topbar" "content";
}

/* ── Topbar ── */
.learn-topbar {
  grid-area: topbar;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1.5rem;
  background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.topbar-brand {
  font-family: var(--font-display);
  font-size: 1.1rem; color: var(--accent);
  letter-spacing: 0.01em;
}
.topbar-breadcrumb {
  font-size: 0.78rem; color: var(--t5);
  display: flex; align-items: center; gap: 0.35rem;
}
.topbar-breadcrumb a { color: var(--t5); }
.topbar-breadcrumb a:hover { color: var(--t3); }
.topbar-breadcrumb span { color: var(--t6); }
.topbar-right { display: flex; align-items: center; gap: 0.65rem; }

.icon-btn {
  background: none; border: none; color: var(--t5);
  cursor: pointer; padding: 0.3rem; border-radius: var(--radius-sm);
  font-size: 18px; display: flex; align-items: center;
  transition: color var(--ease), background var(--ease);
}
.icon-btn:hover { color: var(--t2); background: var(--border); }

.user-avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent-dim); border: 1px solid var(--accent-border);
  color: var(--accent); font-size: 0.75rem; font-weight: 500;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0;
}

/* ── Sidebar ── */
.learn-sidebar {
  grid-area: sidebar;
  background: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
  overflow-y: auto; overflow-x: hidden; scrollbar-width: thin;
}
.sidebar-top {
  padding: 0 1rem; height: var(--topbar-h);
  display: flex; align-items: center;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.sidebar-subject {
  font-size: 0.82rem; font-weight: 500; color: var(--t1);
}
.sidebar-nav { flex: 1; padding: 0.5rem 0; overflow-y: auto; }
.sidebar-chapter {
  padding: 0.4rem 1rem 0.2rem;
  font-size: 0.65rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--t5);
}
.sidebar-topic {
  padding: 0.3rem 1rem 0.3rem 1.5rem;
  font-size: 0.82rem; color: var(--t5); cursor: pointer;
  transition: color var(--ease);
}
.sidebar-topic:hover { color: var(--t3); }
.sidebar-section {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.28rem 1rem 0.28rem 2.25rem;
  font-size: 0.78rem; color: var(--t6);
  cursor: pointer; transition: all var(--ease);
  border-left: 2px solid transparent;
}
.sidebar-section:hover { color: var(--t4); }
.sidebar-section.active {
  color: var(--accent); border-left-color: var(--accent);
  background: var(--accent-dim);
}
.sidebar-section.done { color: var(--t5); }
.sidebar-section .check {
  width: 14px; height: 14px; border-radius: 50%;
  border: 1px solid var(--border2); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 8px;
}
.sidebar-section.done .check { background: var(--physics); border-color: var(--physics); color: #fff; }
.sidebar-section.active .check { border-color: var(--accent); }

/* Progress bar in sidebar */
.sidebar-progress {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.progress-label {
  display: flex; justify-content: space-between;
  font-size: 0.68rem; color: var(--t5); margin-bottom: 0.35rem;
}
.progress-track {
  height: 4px; background: var(--border2);
  border-radius: 2px; overflow: hidden;
}
.progress-fill { height: 100%; border-radius: 2px; transition: width 0.4s ease; }

/* ── Content area ── */
.learn-content {
  grid-area: content;
  padding: 1.75rem 2rem;
  max-width: var(--content-max);
  width: 100%;
}
.learn-content.wide { max-width: 100%; }

/* ── Cards ── */
.l-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.25rem;
  margin-bottom: 1rem;
}
.l-card-title {
  font-size: 0.65rem; text-transform: uppercase;
  letter-spacing: 0.09em; color: var(--physics);
  margin-bottom: 0.75rem;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.48rem 1rem; border-radius: var(--radius-sm);
  font-size: 0.82rem; font-weight: 500;
  font-family: var(--font-body); cursor: pointer;
  transition: opacity var(--ease), background var(--ease); border: none;
}
.btn-primary { background: var(--accent); color: #0a0800; }
.btn-primary:hover { opacity: 0.88; }
.btn-ghost {
  background: transparent; border: 1px solid var(--border2); color: var(--t4);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-subject {
  background: transparent; border: 1px solid var(--border);
  color: var(--t3); border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem; font-size: 0.85rem;
  transition: all var(--ease); cursor: pointer; font-family: var(--font-body);
}
.btn-subject:hover { border-color: var(--accent); color: var(--accent); }

/* ── Mode cards (topic hub) ── */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem; margin-bottom: 1rem;
}
.mode-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 1.1rem;
  cursor: pointer; transition: all var(--ease);
  display: flex; flex-direction: column; gap: 0.4rem;
  text-decoration: none; position: relative;
}
.mode-card:hover:not(.locked) { border-color: var(--accent); background: var(--accent-dim); }
.mode-card.locked { opacity: 0.5; cursor: not-allowed; }
.mode-icon { font-size: 1.6rem; }
.mode-title { font-size: 0.88rem; font-weight: 500; color: var(--t1); }
.mode-sub   { font-size: 0.72rem; color: var(--t4); line-height: 1.5; }
.mode-badge {
  position: absolute; top: 0.6rem; right: 0.6rem;
  font-size: 0.58rem; font-weight: 600; padding: 1px 5px;
  border-radius: 3px; text-transform: uppercase; letter-spacing: 0.04em;
}
.badge-free   { background: rgba(78,205,196,0.15); color: var(--physics); }
.badge-soon   { background: rgba(122,154,184,0.15); color: var(--t5); }
.badge-pro    { background: rgba(255,209,102,0.15); color: var(--accent); }
.badge-pyq    { background: rgba(157,138,255,0.15); color: var(--language); }

/* ── Question block ── */
.q-block {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.25rem;
  margin-bottom: 1rem;
}
.q-meta {
  display: flex; gap: 0.5rem; align-items: center;
  margin-bottom: 0.75rem; flex-wrap: wrap;
}
.q-tag {
  font-size: 0.65rem; font-weight: 500; padding: 2px 7px;
  border-radius: 4px; text-transform: uppercase; letter-spacing: 0.04em;
}
.q-tag-exam   { background: rgba(157,138,255,0.15); color: var(--language); }
.q-tag-year   { background: rgba(122,154,184,0.15); color: var(--t5); }
.q-tag-diff   { background: rgba(255,209,102,0.12); color: var(--accent); }
.q-options { display: flex; flex-direction: column; gap: 0.5rem; margin: 0.85rem 0; }
.q-option {
  display: flex; align-items: center; gap: 0.65rem;
  padding: 0.55rem 0.85rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border2); cursor: pointer;
  transition: all var(--ease); font-size: 0.85rem; color: var(--t2);
}
.q-option:hover  { border-color: var(--accent); color: var(--t1); }
.q-option.selected { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }
.q-option.correct  { border-color: var(--physics); background: rgba(78,205,196,0.1); color: var(--physics); }
.q-option.wrong    { border-color: #f5a623; background: rgba(245,166,35,0.08); color: #f5a623; }
.q-option-letter {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid currentColor; display: flex;
  align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 600; flex-shrink: 0;
}

/* Custom values form */
.custom-form {
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 1rem; margin-top: 0.75rem;
}
.custom-form-title {
  font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--t5); margin-bottom: 0.65rem;
}
.custom-fields {
  display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 0.75rem;
}
.custom-field label {
  display: block; font-size: 0.65rem; color: var(--t5);
  margin-bottom: 0.2rem; text-transform: uppercase; letter-spacing: 0.06em;
}
.custom-field input {
  background: var(--bg); border: 1px solid var(--border2);
  border-radius: var(--radius-sm); padding: 0.38rem 0.6rem;
  color: var(--t2); font-size: 0.83rem; font-family: var(--font-body);
  outline: none; width: 110px; transition: border-color var(--ease);
}
.custom-field input:focus { border-color: var(--accent); color: var(--t1); }

/* ── Dashboard widgets ── */
.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.65rem; margin-bottom: 1rem;
}
.stat-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 0.85rem 1rem;
}
.stat-label { font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--t5); margin-bottom: 0.2rem; }
.stat-value { font-size: 1.3rem; font-weight: 500; color: var(--t1); }
.stat-sub   { font-size: 0.68rem; color: var(--t4); margin-top: 0.1rem; }

/* Streak */
.streak-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.9rem; font-weight: 600; color: var(--accent);
}

/* Subject pill */
.subject-pill {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-size: 0.72rem; padding: 0.22rem 0.65rem;
  border-radius: 20px; border: 1px solid var(--border2);
  color: var(--t4); cursor: pointer; transition: all var(--ease);
  font-family: var(--font-body); background: transparent;
}
.subject-pill:hover { border-color: var(--accent); color: var(--accent); }
.subject-pill.active { background: var(--accent-dim); border-color: var(--accent-border); color: var(--accent); }

/* ── Chat FAB ── */
.chat-fab {
  position: fixed; bottom: 1.5rem; right: 1.5rem;
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  background: var(--accent); color: #0a0800;
  border: none; border-radius: 24px; cursor: pointer;
  font-size: 0.83rem; font-weight: 600; font-family: var(--font-body);
  box-shadow: 0 4px 16px rgba(255,209,102,0.3);
  transition: transform var(--ease), opacity var(--ease);
  z-index: 200; text-decoration: none;
}
.chat-fab:hover { transform: scale(1.04); }
.chat-fab i { font-size: 17px; }

/* ── Skeleton ── */
.skeleton {
  background: linear-gradient(90deg, var(--border) 25%, var(--surface2) 50%, var(--border) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 5px;
}
@keyframes shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ── Bottom tab bar (mobile) ── */
.bottom-tab-bar {
  display: none; position: fixed;
  bottom: 0; left: 0; right: 0; height: var(--tab-bar-h);
  background: var(--surface); border-top: 1px solid var(--border); z-index: 300;
}
.tab-bar-inner { display: flex; height: 100%; }
.tab-item {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 3px;
  color: var(--t5); font-size: 0.6rem;
  border: none; background: none; font-family: var(--font-body);
  text-decoration: none; transition: color var(--ease); cursor: pointer;
}
.tab-item i { font-size: 20px; }
.tab-item.active { color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .learn-layout {
    grid-template-columns: 1fr;
    grid-template-rows: var(--topbar-h) 1fr;
    grid-template-areas: "topbar" "content";
    padding-bottom: var(--tab-bar-h);
  }
  .learn-sidebar { display: none; }
  .bottom-tab-bar { display: block; }
  .learn-content { padding: 1rem; }
  .chat-fab { bottom: calc(var(--tab-bar-h) + 0.85rem); }
  .mode-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 420px) {
  .mode-grid { grid-template-columns: 1fr; }
}

/* ── Mobile breadcrumb / back button ── */
.topbar-back {
  display: none;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.82rem;
  color: var(--t5);
  text-decoration: none;
  transition: color var(--ease);
}
.topbar-back:hover { color: var(--t2); }
.topbar-back i { font-size: 16px; }

@media (max-width: 768px) {
  .topbar-breadcrumb { display: none !important; }
  .topbar-back       { display: flex; }
}