/* ===== ExamAce - Complete CSS with Themes & Full Responsiveness ===== */

/* ── Theme Variables ─────────────────────────────────────────────── */
:root,
[data-theme="dark"] {
  --primary:        #6C63FF;
  --primary-dark:   #4B44C8;
  --primary-light:  #9D97FF;
  --accent:         #FF6B6B;
  --accent2:        #FFD93D;
  --success:        #6BCB77;
  --danger:         #FF6B6B;
  --warning:        #FFD93D;
  --info:           #4D96FF;

  --bg:             #0D0D1A;
  --bg2:            #13132B;
  --bg3:            #1A1A35;
  --surface:        #1E1E40;
  --surface2:       #252550;
  --border:         rgba(108,99,255,0.22);
  --border-light:   rgba(255,255,255,0.07);

  --text:           #F0F0FF;
  --text2:          #A9A9CC;
  --text3:          #6D6D99;

  --sidebar-bg:     #13132B;
  --card-bg:        #1E1E40;
  --input-bg:       #13132B;
  --topbar-bg:      rgba(13,13,26,0.94);
  --nav-bg:         rgba(19,19,43,0.96);
}

[data-theme="light"] {
  --primary:        #6C63FF;
  --primary-dark:   #4B44C8;
  --primary-light:  #5047CC;
  --accent:         #E05252;
  --accent2:        #C89500;
  --success:        #2E9E3A;
  --danger:         #E05252;
  --warning:        #C89500;
  --info:           #2563EB;

  --bg:             #F5F5FF;
  --bg2:            #EBEBFF;
  --bg3:            #E0DFFF;
  --surface:        #FFFFFF;
  --surface2:       #F0EFFF;
  --border:         rgba(108,99,255,0.2);
  --border-light:   rgba(0,0,0,0.08);

  --text:           #1A1A2E;
  --text2:          #4A4A6A;
  --text3:          #8080AA;

  --sidebar-bg:     #FFFFFF;
  --card-bg:        #FFFFFF;
  --input-bg:       #F5F5FF;
  --topbar-bg:      rgba(245,245,255,0.95);
  --nav-bg:         rgba(255,255,255,0.97);
}

[data-theme="blue"] {
  --primary:        #0EA5E9;
  --primary-dark:   #0284C7;
  --primary-light:  #38BDF8;
  --accent:         #F97316;
  --accent2:        #FBBF24;
  --success:        #22C55E;
  --danger:         #EF4444;
  --warning:        #FBBF24;
  --info:           #60A5FA;

  --bg:             #0A1628;
  --bg2:            #0F1E38;
  --bg3:            #162440;
  --surface:        #1A2D4A;
  --surface2:       #1E3454;
  --border:         rgba(14,165,233,0.22);
  --border-light:   rgba(255,255,255,0.07);

  --text:           #E0F2FE;
  --text2:          #93C5FD;
  --text3:          #4B84B4;

  --sidebar-bg:     #0F1E38;
  --card-bg:        #1A2D4A;
  --input-bg:       #0F1E38;
  --topbar-bg:      rgba(10,22,40,0.94);
  --nav-bg:         rgba(15,30,56,0.96);
}

[data-theme="green"] {
  --primary:        #10B981;
  --primary-dark:   #059669;
  --primary-light:  #34D399;
  --accent:         #F59E0B;
  --accent2:        #FCD34D;
  --success:        #22C55E;
  --danger:         #EF4444;
  --warning:        #F59E0B;
  --info:           #3B82F6;

  --bg:             #071A12;
  --bg2:            #0C2318;
  --bg3:            #112B1E;
  --surface:        #163325;
  --surface2:       #1A3D2C;
  --border:         rgba(16,185,129,0.22);
  --border-light:   rgba(255,255,255,0.07);

  --text:           #D1FAE5;
  --text2:          #6EE7B7;
  --text3:          #2E7D56;

  --sidebar-bg:     #0C2318;
  --card-bg:        #163325;
  --input-bg:       #0C2318;
  --topbar-bg:      rgba(7,26,18,0.94);
  --nav-bg:         rgba(12,35,24,0.96);
}

/* ── Reset ───────────────────────────────────────────────────────── */
*,*::before,*::after { box-sizing:border-box;margin:0;padding:0 }
html { scroll-behavior:smooth;-webkit-tap-highlight-color:transparent }
body {
  font-family:'Baloo 2','Noto Sans Devanagari',sans-serif;
  background:var(--bg); color:var(--text);
  min-height:100vh; overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  transition:background .3s, color .3s;
}
a { color:var(--primary-light);text-decoration:none }
button { cursor:pointer;font-family:inherit;border:none }
img { max-width:100% }
input,textarea,select {
  font-family:inherit;background:var(--input-bg);color:var(--text);
  border:1.5px solid var(--border);border-radius:10px;
  padding:11px 15px;font-size:15px;width:100%;outline:none;
  transition:border-color .2s,box-shadow .2s;
}
input:focus,textarea:focus,select:focus {
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(108,99,255,0.15);
}
select option { background:var(--surface) }
::-webkit-scrollbar { width:4px;height:4px }
::-webkit-scrollbar-thumb { background:var(--primary);border-radius:99px }
::-webkit-scrollbar-track { background:transparent }

/* ── Layout Shell (Desktop Sidebar) ─────────────────────────────── */
.app-shell {
  display:flex;
  min-height:100vh;
}

/* Desktop Sidebar */
.desktop-sidebar {
  width:240px;
  flex-shrink:0;
  background:var(--sidebar-bg);
  border-right:1px solid var(--border-light);
  position:fixed;left:0;top:0;bottom:0;
  overflow-y:auto;
  z-index:90;
  padding:0 0 20px;
  display:flex;
  flex-direction:column;
  transition:transform .25s;
}
.sidebar-logo {
  padding:20px 20px 16px;
  font-size:22px;font-weight:800;
  background:linear-gradient(135deg,var(--primary-light),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.sidebar-user {
  display:flex;align-items:center;gap:10px;
  padding:10px 16px 16px;
  border-bottom:1px solid var(--border-light);
  margin-bottom:8px;
}
.sidebar-avatar { width:38px;height:38px;border-radius:50%;border:2px solid var(--primary);object-fit:cover }
.sidebar-username { font-size:13px;font-weight:700;color:var(--text) }
.sidebar-plan { font-size:11px;color:var(--text3) }
.sidebar-nav-item {
  display:flex;align-items:center;gap:12px;
  padding:11px 20px;font-size:14px;font-weight:600;
  color:var(--text2);text-decoration:none;
  border-left:3px solid transparent;
  transition:all .15s;cursor:pointer;
}
.sidebar-nav-item:hover { background:rgba(108,99,255,0.1);color:var(--primary-light) }
.sidebar-nav-item.active {
  background:rgba(108,99,255,0.15);color:var(--primary-light);
  border-left-color:var(--primary);
}
.sidebar-nav-item .nav-icon { font-size:18px;width:24px;text-align:center }
.sidebar-divider { height:1px;background:var(--border-light);margin:8px 16px }
.sidebar-coins {
  display:flex;align-items:center;gap:8px;
  padding:10px 20px;font-size:13px;color:var(--text2);font-weight:600;
}

/* Desktop main wrapper */
.desktop-main {
  margin-left:240px;
  flex:1;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

/* ── Top Bar (Desktop + Mobile) ──────────────────────────────────── */
.app-topbar {
  position:sticky;top:0;z-index:100;
  height:60px;
  background:var(--topbar-bg);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-light);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 20px;
}
.topbar-left { display:flex;align-items:center;gap:12px }
.app-logo-text {
  font-size:20px;font-weight:800;
  background:linear-gradient(135deg,var(--primary-light),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.topbar-page-title { font-size:16px;font-weight:700;color:var(--text2) }
.topbar-right { display:flex;align-items:center;gap:10px }
.coins-badge,.streak-badge {
  display:flex;align-items:center;gap:4px;
  background:var(--surface);border-radius:99px;
  padding:5px 11px;font-size:13px;font-weight:600;
  border:1px solid var(--border);
}
.avatar-btn { display:flex }
.avatar-sm { width:34px;height:34px;border-radius:50%;border:2px solid var(--primary);object-fit:cover }
.hamburger-btn {
  display:none;background:none;border:none;
  color:var(--text);font-size:22px;cursor:pointer;padding:4px;
}

/* ── App Content ─────────────────────────────────────────────────── */
.app-content {
  flex:1;
  padding-bottom:calc(var(--nav-h,68px) + 16px);
}
.page {
  padding:20px;
  max-width:820px;
  margin:0 auto;
}

/* ── Bottom Navigation (Mobile Only) ─────────────────────────────── */
.bottom-nav {
  position:fixed;bottom:0;left:0;right:0;z-index:100;
  height:68px;
  padding-bottom:env(safe-area-inset-bottom,0px);
  background:var(--nav-bg);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-top:1px solid var(--border-light);
  display:flex;align-items:center;justify-content:space-around;
}
.nav-item {
  display:flex;flex-direction:column;align-items:center;gap:2px;
  position:relative;padding:6px 8px;flex:1;
  color:var(--text3);transition:color .2s;
  font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.4px;
  text-decoration:none;
}
.nav-item.active { color:var(--primary-light) }
.nav-icon { font-size:21px;line-height:1;transition:transform .2s }
.nav-item.active .nav-icon { transform:scale(1.15) }
.nav-indicator {
  position:absolute;bottom:3px;left:50%;transform:translateX(-50%);
  width:4px;height:4px;border-radius:50%;
  background:var(--primary-light);box-shadow:0 0 6px var(--primary);
}

/* More FAB */
.more-fab {
  position:fixed;bottom:calc(68px + env(safe-area-inset-bottom,0px) + 14px);right:16px;
  z-index:101;width:42px;height:42px;border-radius:50%;
  background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:20px;cursor:pointer;box-shadow:0 4px 16px rgba(108,99,255,0.5);
  transition:transform .2s;
}
.more-fab:active { transform:scale(0.9) }
.more-menu {
  position:fixed;bottom:calc(68px + env(safe-area-inset-bottom,0px) + 66px);right:16px;
  z-index:101;background:var(--surface2);
  border:1px solid var(--border);border-radius:16px;
  min-width:200px;overflow:hidden;box-shadow:0 8px 32px rgba(0,0,0,0.4);
  animation:slideUp .2s ease;
}
.more-menu a {
  display:block;padding:13px 18px;color:var(--text);
  font-size:14px;font-weight:500;
  border-bottom:1px solid var(--border-light);
  transition:background .15s;
}
.more-menu a:last-child { border-bottom:none }
.more-menu a:hover { background:rgba(108,99,255,0.1) }
.more-menu a.text-danger { color:var(--danger) }
.hidden { display:none!important }

/* ── Cards ───────────────────────────────────────────────────────── */
.card {
  background:var(--card-bg);
  border:1px solid var(--border-light);
  border-radius:16px;padding:18px;margin-bottom:14px;
  box-shadow:0 2px 16px rgba(0,0,0,0.15);
  transition:transform .15s,box-shadow .15s;
}
.card:active { transform:scale(0.99) }
.card-header { display:flex;align-items:center;justify-content:space-between;margin-bottom:14px }
.card-title { font-size:16px;font-weight:700 }

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:10px;
  font-size:15px;font-weight:700;transition:all .15s;
  border:none;cursor:pointer;letter-spacing:.2px;
}
.btn:active { transform:scale(0.97) }
.btn-primary { background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 16px rgba(108,99,255,0.35) }
.btn-primary:hover { box-shadow:0 6px 20px rgba(108,99,255,0.5);filter:brightness(1.05) }
.btn-accent  { background:linear-gradient(135deg,var(--accent),#E84444);color:#fff }
.btn-success { background:linear-gradient(135deg,var(--success),#45A752);color:#fff }
.btn-outline { background:transparent;border:1.5px solid var(--primary);color:var(--primary-light) }
.btn-ghost   { background:var(--surface2);color:var(--text) }
.btn-sm  { padding:7px 14px;font-size:13px;border-radius:8px }
.btn-lg  { padding:15px 28px;font-size:17px;border-radius:14px;width:100% }
.btn-block { width:100% }
.btn:disabled { opacity:0.5;cursor:not-allowed }

/* ── Badges ──────────────────────────────────────────────────────── */
.badge {
  display:inline-flex;align-items:center;gap:3px;
  padding:3px 10px;border-radius:99px;font-size:12px;font-weight:700;
}
.badge-success { background:rgba(107,203,119,0.15);color:var(--success);border:1px solid rgba(107,203,119,0.3) }
.badge-warning { background:rgba(255,217,61,0.15);color:var(--warning);border:1px solid rgba(255,217,61,0.3) }
.badge-danger  { background:rgba(255,107,107,0.15);color:var(--danger);border:1px solid rgba(255,107,107,0.3) }
.badge-info    { background:rgba(77,150,255,0.15);color:var(--info);border:1px solid rgba(77,150,255,0.3) }
.badge-primary { background:rgba(108,99,255,0.15);color:var(--primary-light);border:1px solid var(--border) }

/* ── Section headers ─────────────────────────────────────────────── */
.section-header { display:flex;align-items:center;justify-content:space-between;margin-bottom:14px }
.section-title  { font-size:18px;font-weight:800 }
.section-link   { font-size:13px;color:var(--primary-light);font-weight:600 }

/* ── Stats grid ──────────────────────────────────────────────────── */
.stats-grid { display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:20px }
.stat-card  { background:var(--surface);border:1px solid var(--border-light);border-radius:14px;padding:16px;text-align:center }
.stat-num   { font-size:28px;font-weight:800;color:var(--primary-light);line-height:1;margin-bottom:4px }
.stat-label { font-size:12px;color:var(--text2);font-weight:500 }

/* ── Progress bar ────────────────────────────────────────────────── */
.progress-bar  { height:8px;background:var(--bg3);border-radius:99px;overflow:hidden }
.progress-fill { height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .5s ease }

/* ── Toast ───────────────────────────────────────────────────────── */
.toast {
  position:fixed;top:72px;left:16px;right:16px;z-index:9999;
  padding:13px 18px;border-radius:10px;
  display:flex;align-items:center;gap:10px;
  font-size:14px;font-weight:600;box-shadow:0 4px 20px rgba(0,0,0,0.3);
  animation:toastIn .3s ease,toastOut .3s ease 3.5s;
}
.toast-success { background:rgba(107,203,119,0.12);border:1px solid var(--success);color:var(--success) }
.toast-error   { background:rgba(255,107,107,0.12);border:1px solid var(--danger);color:var(--danger) }
@keyframes toastIn  { from { opacity:0;transform:translateY(-8px) } to { opacity:1;transform:none } }
@keyframes toastOut { from { opacity:1 } to { opacity:0 } }

/* ── Question Card ───────────────────────────────────────────────── */
.question-card {
  background:var(--surface);border:1px solid var(--border-light);
  border-radius:16px;padding:20px;margin-bottom:16px;
}
.question-num  { font-size:12px;color:var(--text3);font-weight:600;margin-bottom:8px;display:flex;gap:6px;align-items:center;flex-wrap:wrap }
.question-text { font-size:16px;font-weight:600;line-height:1.7;margin-bottom:18px }
.options-list  { display:flex;flex-direction:column;gap:10px }
.option-item {
  display:flex;align-items:center;gap:12px;
  padding:13px 16px;border-radius:10px;
  background:var(--bg3);border:1.5px solid var(--border);
  cursor:pointer;transition:all .15s;font-size:15px;font-weight:500;
}
.option-item:hover { border-color:var(--primary);background:rgba(108,99,255,0.1) }
.option-item.selected { border-color:var(--primary);background:rgba(108,99,255,0.12) }
.option-item.correct  { border-color:var(--success);background:rgba(107,203,119,0.12);color:var(--success) }
.option-item.wrong    { border-color:var(--danger);background:rgba(255,107,107,0.12);color:var(--danger) }
.option-label {
  width:28px;height:28px;border-radius:50%;border:1.5px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;flex-shrink:0;
}
.option-item.selected .option-label { background:var(--primary);border-color:var(--primary);color:#fff }
.option-item.correct  .option-label { background:var(--success);border-color:var(--success);color:#fff }
.option-item.wrong    .option-label { background:var(--danger);border-color:var(--danger);color:#fff }
.explanation-box {
  margin-top:16px;padding:14px;border-radius:10px;
  background:rgba(108,99,255,0.08);border:1px solid var(--border);
  font-size:14px;color:var(--text2);line-height:1.7;
  animation:fadeIn .3s ease;
}
.explanation-box strong { color:var(--primary-light) }

/* ── Quiz Mode (Exam-style interface) ───────────────────────────── */
.quiz-mode {
  background:var(--bg);
  min-height:100vh;
  padding-bottom:0;
}
.quiz-header {
  background:var(--topbar-bg);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border-light);
  padding:12px 16px;
  display:flex;align-items:center;justify-content:space-between;
  position:sticky;top:0;z-index:50;
}
.quiz-progress-wrap {
  height:4px;background:var(--bg3);
  position:sticky;top:60px;z-index:49;
}
.quiz-progress-fill {
  height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));
  transition:width .4s ease;
}
.quiz-body { max-width:680px;margin:0 auto;padding:20px 16px 120px }
.quiz-footer {
  position:fixed;bottom:0;left:0;right:0;z-index:50;
  background:var(--nav-bg);backdrop-filter:blur(16px);
  border-top:1px solid var(--border-light);
  padding:12px 20px calc(12px + env(safe-area-inset-bottom,0px));
  display:flex;gap:10px;
  max-width:680px;margin:0 auto;
  left:50%;transform:translateX(-50%);
  width:100%;
}

/* ── Exam Mode ──────────────────────────────────────────────────── */
.exam-mode { background:var(--bg);min-height:100vh }
.exam-header {
  position:sticky;top:0;z-index:200;
  background:var(--topbar-bg);backdrop-filter:blur(12px);
  padding:12px 20px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;
}
.exam-progress-bar  { height:3px;background:var(--bg3);position:sticky;top:60px;z-index:200 }
.exam-progress-fill { height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .3s }
.exam-content { padding:80px 20px 100px;max-width:720px;margin:0 auto }
.exam-footer {
  position:fixed;bottom:0;left:0;right:0;z-index:200;
  background:var(--nav-bg);backdrop-filter:blur(12px);
  padding:12px 20px calc(12px + env(safe-area-inset-bottom,0px));
  border-top:1px solid var(--border);
  display:flex;gap:10px;max-width:720px;margin:0 auto;
  left:50%;transform:translateX(-50%);width:100%;
}
.timer-display {
  font-size:26px;font-weight:800;font-variant-numeric:tabular-nums;
  color:var(--accent2);text-shadow:0 0 12px rgba(255,217,61,0.3);
}
.timer-display.danger { color:var(--danger);text-shadow:0 0 12px rgba(255,107,107,0.5);animation:pulse 1s infinite }
@keyframes pulse { 0%,100% { opacity:1 } 50% { opacity:0.6 } }

.exam-option {
  display:flex;align-items:center;gap:12px;
  padding:14px 16px;border-radius:10px;
  background:var(--bg3);border:1.5px solid var(--border);
  cursor:pointer;transition:all .15s;font-size:15px;color:var(--text);
  margin-bottom:10px;
}
.exam-option:hover { border-color:var(--primary);background:rgba(108,99,255,0.1) }
.exam-option.selected { border-color:var(--primary);background:rgba(108,99,255,0.15) }

.question-palette {
  display:grid;grid-template-columns:repeat(8,1fr);gap:6px;padding:16px;
}
.palette-btn {
  aspect-ratio:1;border-radius:8px;font-size:12px;font-weight:700;
  background:var(--surface);border:1.5px solid var(--border);color:var(--text);
  cursor:pointer;transition:all .15s;
}
.palette-btn.answered { background:var(--primary);border-color:var(--primary);color:#fff }
.palette-btn.current  { border-color:var(--accent2);color:var(--accent2) }
.palette-btn.marked   { background:var(--warning);border-color:var(--warning);color:#000 }

/* ── Auth Pages ──────────────────────────────────────────────────── */
.auth-page {
  min-height:100vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;padding:32px 20px;
  background:radial-gradient(ellipse at 50% 0%,rgba(108,99,255,0.2) 0%,transparent 65%),var(--bg);
}
.auth-logo { font-size:36px;font-weight:800;margin-bottom:8px;
  background:linear-gradient(135deg,var(--primary-light),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text }
.auth-sub  { color:var(--text2);font-size:14px;margin-bottom:28px;text-align:center }
.auth-card {
  width:100%;max-width:440px;
  background:var(--card-bg);border:1px solid var(--border);
  border-radius:24px;padding:28px;box-shadow:0 8px 40px rgba(0,0,0,0.3);
}
.auth-title { font-size:22px;font-weight:800;margin-bottom:22px }
.form-group  { margin-bottom:16px }
.form-label  { display:block;font-size:13px;font-weight:600;color:var(--text2);margin-bottom:6px }

/* ── Dashboard ───────────────────────────────────────────────────── */
.hero-banner {
  border-radius:20px;
  background:linear-gradient(135deg,#3d35c8 0%,var(--primary) 50%,var(--primary-light) 100%);
  padding:22px;margin-bottom:20px;position:relative;overflow:hidden;
}
.hero-banner::before {
  content:'';position:absolute;inset:0;
  background:radial-gradient(circle at 80% 20%,rgba(255,255,255,0.1),transparent 60%);
}
.hero-greeting { font-size:20px;font-weight:800;color:#fff;position:relative }
.hero-sub      { font-size:13px;color:rgba(255,255,255,0.8);margin-top:4px;position:relative }
.hero-stats    { display:flex;gap:12px;margin-top:16px;position:relative }
.hero-stat     { flex:1;background:rgba(255,255,255,0.12);border-radius:12px;padding:10px;text-align:center;backdrop-filter:blur(4px) }
.hero-stat-num { font-size:22px;font-weight:800;color:#fff }
.hero-stat-lbl { font-size:11px;color:rgba(255,255,255,0.75) }

.subject-grid  { display:grid;grid-template-columns:repeat(3,1fr);gap:10px }
.subject-item  {
  background:var(--surface);border:1px solid var(--border-light);
  border-radius:14px;padding:14px 10px;text-align:center;
  transition:all .15s;cursor:pointer;text-decoration:none;color:var(--text);
}
.subject-item:hover,.subject-item:active { transform:translateY(-2px);border-color:var(--primary);box-shadow:0 4px 16px rgba(108,99,255,0.2) }
.subject-icon { font-size:28px;display:block;margin-bottom:6px }
.subject-name { font-size:12px;font-weight:700 }

.quick-actions { display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:20px }
.qa-card {
  background:var(--surface);border:1px solid var(--border-light);
  border-radius:14px;padding:16px;display:flex;align-items:center;gap:12px;
  text-decoration:none;color:var(--text);transition:all .15s;
}
.qa-card:hover { transform:translateY(-2px);border-color:var(--primary);box-shadow:0 4px 16px rgba(108,99,255,0.15) }
.qa-icon  { font-size:28px }
.qa-title { font-size:14px;font-weight:700 }
.qa-sub   { font-size:12px;color:var(--text2) }

.rank-card {
  background:linear-gradient(135deg,var(--surface),var(--surface2));
  border:1px solid var(--border);border-radius:16px;
  padding:16px;display:flex;align-items:center;gap:16px;margin-bottom:20px;
}

/* ── Leaderboard ─────────────────────────────────────────────────── */
.lb-item { display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border-light) }
.lb-rank   { width:28px;font-size:16px;font-weight:800;text-align:center }
.lb-avatar { width:36px;height:36px;border-radius:50%;object-fit:cover }
.lb-name   { flex:1;font-size:14px;font-weight:600 }
.lb-score  { font-size:15px;font-weight:800;color:var(--accent2) }

/* ── AI Chat ─────────────────────────────────────────────────────── */
.ai-msg {
  padding:13px 16px;border-radius:10px;font-size:15px;line-height:1.7;
  max-width:88%;animation:fadeIn .3s ease;
}
.ai-msg-user { background:var(--primary);color:#fff;align-self:flex-end;border-radius:10px 3px 10px 10px }
.ai-msg-bot  { background:var(--surface2);color:var(--text);align-self:flex-start;border-radius:3px 10px 10px 10px }
.ai-msg-bot strong { color:var(--primary-light) }
.ai-dot { width:8px;height:8px;border-radius:50%;background:var(--text3);animation:bounce .8s infinite }
.ai-dot:nth-child(2) { animation-delay:.15s }
.ai-dot:nth-child(3) { animation-delay:.3s }
@keyframes bounce { 0%,100% { transform:translateY(0) } 50% { transform:translateY(-6px) } }

/* ── Notes ───────────────────────────────────────────────────────── */
.note-content { font-size:15px;line-height:1.8;color:var(--text2) }
.note-content h2 { font-size:18px;font-weight:700;color:var(--primary-light);margin:20px 0 10px }
.note-content h3 { font-size:16px;font-weight:700;color:var(--text);margin:16px 0 8px }
.note-content strong { color:var(--text) }
.note-content code { background:var(--bg3);border-radius:6px;padding:2px 8px;font-family:monospace;font-size:13px;color:var(--accent) }
.note-tag { display:inline-block;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600 }
.note-tag-formula  { background:rgba(255,217,61,0.1);color:var(--warning);border:1px solid rgba(255,217,61,0.3) }
.note-tag-note     { background:rgba(77,150,255,0.1);color:var(--info);border:1px solid rgba(77,150,255,0.3) }
.note-tag-shortcut { background:rgba(107,203,119,0.1);color:var(--success);border:1px solid rgba(107,203,119,0.3) }

/* ── Community ───────────────────────────────────────────────────── */
.community-q { background:var(--surface);border:1px solid var(--border-light);border-radius:16px;padding:16px;margin-bottom:12px }
.community-q-title { font-size:15px;font-weight:700;margin-bottom:8px }
.community-meta { display:flex;align-items:center;gap:10px;font-size:12px;color:var(--text3);flex-wrap:wrap }
.upvote-btn { display:flex;align-items:center;gap:5px;background:var(--surface2);border:1px solid var(--border);border-radius:99px;padding:4px 12px;font-size:13px;font-weight:700;color:var(--text);cursor:pointer;transition:all .15s }
.upvote-btn:hover,.upvote-btn.voted { border-color:var(--accent);color:var(--accent) }
.answer-card { background:var(--bg3);border-radius:10px;padding:14px;margin-bottom:10px;font-size:14px;line-height:1.7 }
.answer-card.accepted { border-left:3px solid var(--success) }

/* ── Score Circle ────────────────────────────────────────────────── */
.score-circle {
  width:120px;height:120px;border-radius:50%;
  background:conic-gradient(var(--primary) calc(var(--pct)*1%),var(--bg3) 0);
  display:flex;align-items:center;justify-content:center;
  margin:0 auto 20px;position:relative;
}
.score-circle::before { content:'';position:absolute;inset:10px;border-radius:50%;background:var(--surface) }
.score-circle-val { position:relative;font-size:26px;font-weight:800;color:var(--primary-light) }

/* ── Modal ───────────────────────────────────────────────────────── */
.modal-overlay {
  position:fixed;inset:0;background:rgba(0,0,0,0.65);z-index:500;
  display:flex;align-items:flex-end;justify-content:center;
  backdrop-filter:blur(4px);
}
.modal-sheet {
  background:var(--surface);border-radius:24px 24px 0 0;
  padding:24px;width:100%;max-width:620px;max-height:90vh;overflow-y:auto;
  animation:slideUp .25s ease;
}

/* ── Admin ───────────────────────────────────────────────────────── */
.admin-sidebar {
  width:240px;background:var(--sidebar-bg);border-right:1px solid var(--border);
  padding:20px 0;flex-shrink:0;position:fixed;left:0;top:0;bottom:0;
  overflow-y:auto;z-index:50;
}
.admin-sidebar-logo { padding:0 20px 20px;font-size:22px;font-weight:800;
  background:linear-gradient(135deg,var(--primary-light),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text }
.admin-nav-item {
  display:flex;align-items:center;gap:10px;
  padding:12px 20px;font-size:14px;font-weight:600;
  color:var(--text2);text-decoration:none;transition:all .15s;
  border-left:3px solid transparent;
}
.admin-nav-item:hover,.admin-nav-item.active {
  background:rgba(108,99,255,0.1);color:var(--primary-light);
  border-left-color:var(--primary);
}
.admin-main { margin-left:240px;padding:24px;flex:1 }
.admin-topbar { display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--border) }
.admin-page-title { font-size:24px;font-weight:800 }
.stat-cards { display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-bottom:24px }
.stat-c { background:var(--surface);border:1px solid var(--border-light);border-radius:16px;padding:20px }
.stat-c-num   { font-size:32px;font-weight:800;color:var(--primary-light) }
.stat-c-label { font-size:13px;color:var(--text2);margin-top:4px }
.admin-table { width:100%;border-collapse:collapse;font-size:14px }
.admin-table th { text-align:left;padding:12px 16px;font-size:12px;color:var(--text3);font-weight:700;text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border) }
.admin-table td { padding:12px 16px;border-bottom:1px solid var(--border-light);vertical-align:middle }
.admin-table tr:hover td { background:rgba(108,99,255,0.05) }
.admin-card { background:var(--surface);border:1px solid var(--border-light);border-radius:16px;padding:20px;margin-bottom:20px }

/* ── Misc utils ──────────────────────────────────────────────────── */
@keyframes fadeIn  { from { opacity:0 } to { opacity:1 } }
@keyframes scaleIn { from { transform:scale(0.9);opacity:0 } to { transform:scale(1);opacity:1 } }
@keyframes slideUp { from { opacity:0;transform:translateY(12px) } to { opacity:1;transform:none } }
@keyframes spin    { to { transform:rotate(360deg) } }

.loading-spinner { width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 0.7s linear infinite;margin:40px auto }
.empty-state { text-align:center;padding:48px 16px;color:var(--text2) }
.empty-icon  { font-size:56px;display:block;margin-bottom:12px }
.divider     { height:1px;background:var(--border-light);margin:16px 0 }

.text-primary { color:var(--primary-light) }
.text-accent  { color:var(--accent) }
.text-success { color:var(--success) }
.text-danger  { color:var(--danger) }
.text-muted   { color:var(--text2) }
.fw-bold { font-weight:700 }
.fw-800  { font-weight:800 }
.text-sm { font-size:13px }
.text-lg { font-size:18px }
.mb-4 { margin-bottom:16px }
.mt-4 { margin-top:16px }
.flex { display:flex }
.flex-center { display:flex;align-items:center;justify-content:center }
.gap-2 { gap:8px }
.gap-3 { gap:12px }

/* Pricing */
.pro-hero { text-align:center;padding:32px 16px;background:linear-gradient(135deg,var(--surface),var(--surface2));border-radius:20px;margin-bottom:20px;border:1px solid var(--border) }
.pricing-card { background:var(--surface);border:2px solid var(--border-light);border-radius:20px;padding:24px;margin-bottom:14px }
.pricing-card.featured { border-color:var(--primary);background:linear-gradient(135deg,var(--surface),rgba(108,99,255,0.1)) }
.price-amount { font-size:38px;font-weight:800;color:var(--primary-light) }
.feature-check { display:flex;align-items:center;gap:10px;padding:7px 0;font-size:14px }

/* ── Theme Switcher ──────────────────────────────────────────────── */
.theme-switcher { display:flex;gap:8px;flex-wrap:wrap }
.theme-btn {
  width:32px;height:32px;border-radius:50%;border:3px solid transparent;
  cursor:pointer;transition:all .2s;position:relative;
}
.theme-btn.active { border-color:var(--text);transform:scale(1.15) }
.theme-btn::after { content:'';position:absolute;inset:2px;border-radius:50% }
.theme-dark  { background:linear-gradient(135deg,#0D0D1A,#6C63FF) }
.theme-light { background:linear-gradient(135deg,#F5F5FF,#6C63FF) }
.theme-blue  { background:linear-gradient(135deg,#0A1628,#0EA5E9) }
.theme-green { background:linear-gradient(135deg,#071A12,#10B981) }

/* ── RESPONSIVE ──────────────────────────────────────────────────── */

/* Desktop: show sidebar, hide bottom nav */
@media (min-width:768px) {
  .desktop-sidebar { display:flex }
  .desktop-main    { display:flex;flex-direction:column }
  .app-content     { padding-bottom:20px }
  .bottom-nav, .more-fab, .more-menu { display:none!important }
  .app-topbar      { position:sticky }
  .hamburger-btn   { display:none }
  .stats-grid      { grid-template-columns:repeat(4,1fr) }
  .subject-grid    { grid-template-columns:repeat(6,1fr) }
  .quick-actions   { grid-template-columns:repeat(4,1fr) }
  .page            { padding:24px 28px }
  .question-palette { grid-template-columns:repeat(10,1fr) }
  .quiz-footer     { max-width:680px }
  .auth-card       { padding:36px }
}

/* Mobile: hide sidebar, show bottom nav */
@media (max-width:767px) {
  .desktop-sidebar { display:none!important }
  .desktop-main    { margin-left:0!important }
  .app-content     { padding-bottom:calc(68px + env(safe-area-inset-bottom,0px) + 12px) }
  .hamburger-btn   { display:flex }
  .stats-grid      { grid-template-columns:repeat(2,1fr) }
  .subject-grid    { grid-template-columns:repeat(3,1fr) }
  .quick-actions   { grid-template-columns:repeat(2,1fr) }
  .page            { padding:14px }
  .admin-sidebar   { display:none }
  .admin-main      { margin-left:0;padding:14px }
  .stat-cards      { grid-template-columns:repeat(2,1fr) }
  .exam-content    { padding:80px 14px 90px }
  .exam-footer     { left:0;transform:none;width:100% }
  .question-palette { grid-template-columns:repeat(6,1fr) }
  .quiz-footer     { left:0;transform:none;width:100% }
}

/* Tablet tweaks */
@media (min-width:768px) and (max-width:1024px) {
  .desktop-sidebar { width:200px }
  .desktop-main    { margin-left:200px }
  .admin-sidebar   { width:200px }
  .admin-main      { margin-left:200px }
}

/* Very small screens */
@media (max-width:360px) {
  .hero-stats      { gap:6px }
  .hero-stat-num   { font-size:18px }
  .timer-display   { font-size:20px }
}