/* =====================================================
   AI ADAPTIVE EXAM SYSTEM — Liquid Glass Theme
   iOS 26 / visionOS — Dark + Light
===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─────────────────────────────────────────────────────
   DESIGN TOKENS
───────────────────────────────────────────────────── */
:root {
  --bg:        #07090f;
  --bg2:       #0b0e1a;
  --bg3:       rgba(255,255,255,0.06);

  --card:      rgba(255,255,255,0.06);
  --card-strong: rgba(255,255,255,0.10);

  --border:    rgba(255,255,255,0.11);
  --border2:   rgba(255,255,255,0.20);
  --border-top: rgba(255,255,255,0.28); /* specular edge highlight */

  --text:      rgba(255,255,255,0.93);
  --text2:     rgba(255,255,255,0.55);
  --text3:     rgba(255,255,255,0.28);

  --accent:    #4f8ef7;
  --accent-h:  #72a8ff;
  --accent2:   #9b6ff0;

  --blue-glow:   rgba(79,142,247,0.22);
  --purple-glow: rgba(155,111,240,0.16);

  --green:     #2dda80;
  --green-bg:  rgba(45,218,128,0.12);
  --red:       #ff5f6d;
  --red-bg:    rgba(255,95,109,0.12);
  --yellow:    #ffd166;
  --yellow-bg: rgba(255,209,102,0.12);

  --white: #ffffff;
  --radius:    20px;
  --radius-sm: 13px;

  --shadow-dark: 0 12px 40px rgba(0,0,0,0.55), 0 1px 0 rgba(255,255,255,0.07) inset;
  --shadow:      var(--shadow-dark);

  --glass-blur:    blur(28px) saturate(200%);
  --glass-blur-sm: blur(16px) saturate(180%);

  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --transition: 0.24s cubic-bezier(.4,0,.2,1);
  --spring:     0.38s cubic-bezier(0.34,1.56,0.64,1);
}

/* ─────────────────────────────────────────────────────
   LIGHT MODE TOKENS — vivid orb colours, low-opacity glass
───────────────────────────────────────────────────── */
[data-theme="light"] {
  /* Pure white body so orbs pop through the glass */
  --bg:        #ffffff;
  --bg2:       #f8f9ff;
  --bg3:       rgba(255,255,255,0.30);

  /* Glass panes: very translucent so colour bleeds through */
  --card:      rgba(255,255,255,0.22);
  --card-strong: rgba(255,255,255,0.38);

  /* Borders: bright top edge + subtle outer ring */
  --border:    rgba(255,255,255,0.55);
  --border2:   rgba(180,200,240,0.45);
  --border-top: rgba(255,255,255,0.90);

  --text:      #0d1420;
  --text2:     #3d4f70;
  --text3:     #8494b4;

  --blue-glow: rgba(79,142,247,0.18);

  --green-bg:  rgba(45,218,128,0.14);
  --red-bg:    rgba(255,95,109,0.12);
  --yellow-bg: rgba(255,209,102,0.14);

  --shadow: 0 8px 32px rgba(80,110,200,0.18),
            0 1px 0   rgba(255,255,255,0.95) inset,
            0 -1px 0  rgba(180,200,240,0.20) inset;
}

/* ─────────────────────────────────────────────────────
   ANIMATED ORB LAYER  (the "colour behind the glass")
   Dark: subtle neons / Light: vivid saturated blobs
───────────────────────────────────────────────────── */
@keyframes orbFloat1 {
  0%,100% { transform: translate(0,0)   scale(1);    }
  33%      { transform: translate(6%,4%) scale(1.06); }
  66%      { transform: translate(-4%,7%) scale(0.96); }
}
@keyframes orbFloat2 {
  0%,100% { transform: translate(0,0)    scale(1);    }
  40%      { transform: translate(-5%,-6%) scale(1.08); }
  70%      { transform: translate(7%,-3%)  scale(0.95); }
}
@keyframes orbFloat3 {
  0%,100% { transform: translate(0,0)   scale(1);    }
  50%      { transform: translate(4%,-8%) scale(1.05); }
}
@keyframes orbPulse {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.75; }
}

/* Dark orbs */
.orb-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

/* Everything visible sits above the orb layer */
.app-layout,
.page-center,
#toast {
  position: relative;
  z-index: 1;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  will-change: transform, opacity;
  z-index: 0;
}

/* Dark theme orbs */
.orb-1 {
  width: 55vw; height: 55vw;
  top: -15%; left: -10%;
  background: radial-gradient(circle, rgba(79,142,247,0.55) 0%, rgba(79,142,247,0) 70%);
  animation: orbFloat1 14s infinite, orbPulse 7s infinite;
}
.orb-2 {
  width: 50vw; height: 50vw;
  bottom: -10%; right: -10%;
  background: radial-gradient(circle, rgba(155,111,240,0.50) 0%, rgba(155,111,240,0) 70%);
  animation: orbFloat2 18s infinite, orbPulse 9s 2s infinite;
}
.orb-3 {
  width: 40vw; height: 40vw;
  top: 40%; left: 35%;
  background: radial-gradient(circle, rgba(45,218,128,0.30) 0%, rgba(45,218,128,0) 70%);
  animation: orbFloat3 12s infinite;
}

/* Light theme orbs — fully saturated, bigger, so they show through the glass */
[data-theme="light"] .orb-1 {
  background: radial-gradient(circle, rgba(79,142,247,0.70) 0%, rgba(100,160,255,0) 70%);
}
[data-theme="light"] .orb-2 {
  background: radial-gradient(circle, rgba(210,100,240,0.65) 0%, rgba(180,80,240,0) 70%);
}
[data-theme="light"] .orb-3 {
  background: radial-gradient(circle, rgba(45,218,128,0.60) 0%, rgba(45,218,128,0) 70%);
}
/* Extra warm orb in light mode */
[data-theme="light"] .orb-4 {
  width: 38vw; height: 38vw;
  top: 10%; right: 15%;
  background: radial-gradient(circle, rgba(255,160,80,0.45) 0%, rgba(255,160,80,0) 70%);
  animation: orbFloat2 16s 3s infinite;
}

/* Base body */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.4s ease, color 0.3s ease;
  isolation: isolate; /* keep orb layer behind all content */
}

a { color: var(--accent); text-decoration: none; }
a:hover { opacity: 0.8; }

::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(128,128,180,0.25); border-radius: 4px; }

/* ─────────────────────────────────────────────────────
   GLASS CARD BASE
   Key: low fill + strong blur + bright top edge
───────────────────────────────────────────────────── */
@keyframes cardIn {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}

.glass,
.card {
  background: var(--card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-top-color: var(--border-top);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Light: add a subtle inner shimmer gradient */
[data-theme="light"] .glass,
[data-theme="light"] .card {
  background: linear-gradient(
    145deg,
    rgba(255,255,255,0.28) 0%,
    rgba(255,255,255,0.12) 60%,
    rgba(255,255,255,0.20) 100%
  );
  border-color: rgba(255,255,255,0.60);
  border-top-color: rgba(255,255,255,0.95);
}

/* ─────────────────────────────────────────────────────
   LAYOUT HELPERS
───────────────────────────────────────────────────── */
.page-center {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
}
.hidden { display: none !important; }

/* ─────────────────────────────────────────────────────
   BUTTONS
───────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 22px;
  border-radius: 100px;
  border: 1px solid var(--border2);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
  transition: transform var(--spring), box-shadow var(--transition), background var(--transition), border-color var(--transition);
  white-space: nowrap;
  letter-spacing: 0.2px;
  text-decoration: none;
  backdrop-filter: var(--glass-blur-sm);
  -webkit-backdrop-filter: var(--glass-blur-sm);
  background: rgba(255,255,255,0.09);
  color: var(--text);
  position: relative;
  overflow: hidden;
}

/* Shimmer sweep on hover */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 35%, rgba(255,255,255,0.18) 50%, transparent 65%);
  transform: translateX(-100%);
  transition: transform 0.55s ease;
  pointer-events: none;
}
.btn:not(:disabled):hover::after { transform: translateX(100%); }

.btn:disabled { opacity: 0.38; cursor: not-allowed; transform: none !important; }
.btn:not(:disabled):hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0,0,0,0.28), 0 1px 0 rgba(255,255,255,0.18) inset;
  border-color: rgba(255,255,255,0.30);
}
.btn:not(:disabled):active { transform: translateY(0) scale(0.98); }

.btn-primary {
  background: linear-gradient(135deg, rgba(79,142,247,0.88), rgba(110,130,250,0.84));
  color: #fff;
  border-color: rgba(140,185,255,0.45);
  box-shadow: 0 4px 22px rgba(79,142,247,0.40), 0 1px 0 rgba(255,255,255,0.25) inset;
}
.btn-primary:not(:disabled):hover {
  background: linear-gradient(135deg, rgba(100,158,255,0.92), rgba(130,148,255,0.90));
  box-shadow: 0 8px 28px rgba(79,142,247,0.55), 0 1px 0 rgba(255,255,255,0.30) inset;
}
.btn-secondary {
  background: linear-gradient(135deg, rgba(155,111,240,0.84), rgba(130,95,225,0.80));
  color: #fff;
  border-color: rgba(190,165,255,0.38);
  box-shadow: 0 4px 20px rgba(155,111,240,0.35), 0 1px 0 rgba(255,255,255,0.20) inset;
}
.btn-ghost {
  background: rgba(255,255,255,0.07);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:not(:disabled):hover { background: rgba(255,255,255,0.14); }
.btn-danger {
  background: linear-gradient(135deg, rgba(255,95,109,0.84), rgba(220,65,85,0.80));
  color: #fff;
  border-color: rgba(255,145,155,0.32);
  box-shadow: 0 4px 18px rgba(255,95,109,0.32);
}
.btn-success {
  background: linear-gradient(135deg, rgba(45,218,128,0.84), rgba(28,185,95,0.80));
  color: #fff;
  border-color: rgba(100,255,168,0.32);
  box-shadow: 0 4px 18px rgba(45,218,128,0.30);
}
.btn-full { width: 100%; }
.btn-sm   { padding: 7px 15px; font-size: 12px; }

/* Light mode button base */
[data-theme="light"] .btn {
  background: rgba(255,255,255,0.42);
  border-color: rgba(180,200,240,0.55);
  color: #0d1420;
  box-shadow: 0 2px 10px rgba(80,110,200,0.10), 0 1px 0 rgba(255,255,255,0.90) inset;
}
[data-theme="light"] .btn:not(:disabled):hover {
  background: rgba(255,255,255,0.68);
  box-shadow: 0 6px 20px rgba(80,110,200,0.18), 0 1px 0 rgba(255,255,255,0.95) inset;
  border-color: rgba(140,175,255,0.60);
}

/* ─────────────────────────────────────────────────────
   INPUTS
───────────────────────────────────────────────────── */
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 11px; font-weight: 700;
  letter-spacing: 1px; text-transform: uppercase;
  color: var(--text2); margin-bottom: 6px;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 11px 15px;
  background: rgba(255,255,255,0.07);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-top-color: var(--border-top);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px; font-family: var(--font);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: rgba(79,142,247,0.65);
  background: rgba(255,255,255,0.11);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.18), 0 1px 0 rgba(255,255,255,0.14) inset;
}
.field .err { font-size: 11px; color: var(--red); margin-top: 4px; min-height: 15px; }
.field select option { background: #111827; color: var(--text); }

[data-theme="light"] .field input,
[data-theme="light"] .field select,
[data-theme="light"] .field textarea {
  background: rgba(255,255,255,0.35);
  border-color: rgba(200,215,245,0.60);
  border-top-color: rgba(255,255,255,0.90);
  color: #0d1420;
}
[data-theme="light"] .field input:focus,
[data-theme="light"] .field select:focus,
[data-theme="light"] .field textarea:focus {
  background: rgba(255,255,255,0.60);
  border-color: rgba(79,142,247,0.60);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.12), 0 1px 0 rgba(255,255,255,0.95) inset;
}
[data-theme="light"] .field select option { background: #fff; color: #0d1420; }

/* ─────────────────────────────────────────────────────
   GOOGLE BUTTON
───────────────────────────────────────────────────── */
.google-btn {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.98);
  border-radius: 100px;
  color: #1a1a2e;
  font-size: 13px; font-weight: 600;
  cursor: pointer; font-family: var(--font);
  transition: box-shadow var(--transition), transform var(--spring);
  text-decoration: none;
  box-shadow: 0 4px 18px rgba(0,0,0,0.14), 0 1px 0 rgba(255,255,255,0.95) inset;
}
.google-btn:hover {
  box-shadow: 0 8px 26px rgba(0,0,0,0.22), 0 1px 0 rgba(255,255,255,0.98) inset;
  transform: translateY(-2px);
}
.google-btn:active { transform: translateY(0); }
.google-btn img { width: 18px; height: 18px; }

/* ─────────────────────────────────────────────────────
   DIVIDER
───────────────────────────────────────────────────── */
.divider {
  display: flex; align-items: center; gap: 10px;
  margin: 16px 0; color: var(--text3);
  font-size: 11px; font-weight: 600; letter-spacing: 1px;
}
.divider::before, .divider::after {
  content: ''; flex: 1; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

/* ─────────────────────────────────────────────────────
   BADGES
───────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 11px; border-radius: 100px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.3px;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.badge-blue   { background: rgba(79,142,247,0.16);  color: #93c5fd; border: 1px solid rgba(79,142,247,0.32); }
.badge-green  { background: rgba(45,218,128,0.14);  color: #6ee7b7; border: 1px solid rgba(45,218,128,0.26); }
.badge-yellow { background: rgba(255,209,102,0.14); color: #fcd34d; border: 1px solid rgba(255,209,102,0.28); }
.badge-red    { background: rgba(255,95,109,0.14);  color: #fca5a5; border: 1px solid rgba(255,95,109,0.28); }
.badge-purple { background: rgba(155,111,240,0.16); color: #c4b5fd; border: 1px solid rgba(155,111,240,0.32); }

[data-theme="light"] .badge-blue   { background: rgba(79,142,247,0.14); color: #1d4ed8; border-color: rgba(79,142,247,0.28); }
[data-theme="light"] .badge-green  { background: rgba(45,218,128,0.14); color: #15803d; border-color: rgba(45,218,128,0.26); }
[data-theme="light"] .badge-yellow { background: rgba(255,180,40,0.16); color: #92400e; border-color: rgba(255,180,40,0.30); }
[data-theme="light"] .badge-red    { background: rgba(255,95,109,0.12); color: #b91c1c; border-color: rgba(255,95,109,0.26); }
[data-theme="light"] .badge-purple { background: rgba(155,111,240,0.14); color: #5b21b6; border-color: rgba(155,111,240,0.28); }

/* ─────────────────────────────────────────────────────
   TOAST — spring entrance
───────────────────────────────────────────────────── */
.toast {
  position: fixed; top: 16px; right: 16px;
  padding: 12px 18px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600; z-index: 99999;
  opacity: 0; pointer-events: none;
  transform: translateY(-10px) scale(0.94);
  transition: opacity 0.26s ease, transform 0.36s var(--spring);
  max-width: 320px;
  backdrop-filter: var(--glass-blur-sm);
  -webkit-backdrop-filter: var(--glass-blur-sm);
  border: 1px solid var(--border2);
  box-shadow: var(--shadow);
}
.toast.show   { opacity: 1; transform: translateY(0) scale(1); }
.toast.success { background: rgba(45,218,128,0.16); color: #6ee7b7; border-color: rgba(45,218,128,0.32); }
.toast.error   { background: rgba(255,95,109,0.16); color: #fca5a5; border-color: rgba(255,95,109,0.32); }
.toast.info    { background: rgba(79,142,247,0.16); color: #93c5fd; border-color: rgba(79,142,247,0.32); }
.toast.warn    { background: rgba(255,209,102,0.16); color: #fcd34d; border-color: rgba(255,209,102,0.32); }

[data-theme="light"] .toast.success { background: rgba(45,218,128,0.20); color: #15803d; }
[data-theme="light"] .toast.error   { background: rgba(255,95,109,0.18); color: #b91c1c; }
[data-theme="light"] .toast.info    { background: rgba(79,142,247,0.18); color: #1d4ed8; }
[data-theme="light"] .toast.warn    { background: rgba(255,180,40,0.20); color: #92400e; }

/* ─────────────────────────────────────────────────────
   SPINNER
───────────────────────────────────────────────────── */
.spinner {
  width: 32px; height: 32px;
  border: 2px solid rgba(255,255,255,0.10);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.65s linear infinite; flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─────────────────────────────────────────────────────
   PROGRESS BAR
───────────────────────────────────────────────────── */
.prog-wrap {
  background: rgba(255,255,255,0.08);
  border-radius: 10px; height: 5px; overflow: hidden;
}
[data-theme="light"] .prog-wrap { background: rgba(0,0,0,0.08); }

.prog-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 10px;
  transition: width 0.55s cubic-bezier(0.25,0.46,0.45,0.94);
  box-shadow: 0 0 12px var(--blue-glow);
  position: relative;
  overflow: hidden;
}
/* Animated shimmer on progress fill */
.prog-fill::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent 20%, rgba(255,255,255,0.30) 50%, transparent 80%);
  animation: progShimmer 2s ease-in-out infinite;
}
@keyframes progShimmer {
  from { transform: translateX(-100%); }
  to   { transform: translateX(200%); }
}

/* ─────────────────────────────────────────────────────
   THEME TOGGLE
───────────────────────────────────────────────────── */
.theme-toggle {
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  border-top-color: var(--border-top);
  border-radius: 50%;
  background: rgba(255,255,255,0.09);
  backdrop-filter: var(--glass-blur-sm);
  -webkit-backdrop-filter: var(--glass-blur-sm);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  transition: transform var(--spring), box-shadow var(--transition), background var(--transition);
  flex-shrink: 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.22), 0 1px 0 rgba(255,255,255,0.15) inset;
}
.theme-toggle:hover {
  transform: scale(1.12) rotate(15deg);
  box-shadow: 0 6px 18px rgba(79,142,247,0.28), 0 1px 0 rgba(255,255,255,0.22) inset;
  border-color: rgba(79,142,247,0.55);
}
[data-theme="light"] .theme-toggle {
  background: rgba(255,255,255,0.50);
  border-color: rgba(200,215,245,0.65);
  box-shadow: 0 2px 10px rgba(80,110,200,0.15), 0 1px 0 rgba(255,255,255,0.95) inset;
}

/* ─────────────────────────────────────────────────────
   RANK COLOURS
───────────────────────────────────────────────────── */
.rank-S { color: #fbbf24; text-shadow: 0 0 14px rgba(251,191,36,0.60); }
.rank-A { color: #a78bfa; text-shadow: 0 0 14px rgba(167,139,250,0.55); }
.rank-B { color: #60a5fa; text-shadow: 0 0 12px rgba(96,165,250,0.50); }
.rank-C { color: #34d399; text-shadow: 0 0 12px rgba(52,211,153,0.45); }
.rank-D { color: #fb923c; }
.rank-F { color: var(--text3); }

/* ─────────────────────────────────────────────────────
   STEP BAR
───────────────────────────────────────────────────── */
.step-bar { display: flex; align-items: center; margin-bottom: 32px; }
.step-item { display: flex; align-items: center; gap: 8px; }
.step-circle {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
  border: 1px solid var(--border2);
  color: var(--text3);
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition);
}
.step-item.done .step-circle {
  background: linear-gradient(135deg, rgba(45,218,128,0.75), rgba(28,185,95,0.70));
  border-color: rgba(45,218,128,0.42); color: #fff;
  box-shadow: 0 0 14px rgba(45,218,128,0.35);
}
.step-item.active .step-circle {
  background: linear-gradient(135deg, rgba(79,142,247,0.80), rgba(110,130,250,0.75));
  border-color: rgba(79,142,247,0.48); color: #fff;
  box-shadow: 0 0 16px rgba(79,142,247,0.40);
}
.step-label { font-size: 12px; font-weight: 600; color: var(--text3); }
.step-item.active .step-label { color: var(--text); }
.step-line { flex: 1; height: 1px; background: var(--border); margin: 0 6px; }
.step-line.done { background: linear-gradient(90deg, rgba(45,218,128,0.55), rgba(79,142,247,0.35)); }

/* ─────────────────────────────────────────────────────
   TABLE
───────────────────────────────────────────────────── */
.tbl { width: 100%; border-collapse: collapse; }
.tbl th {
  font-size: 10px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--text3); padding: 10px 14px; text-align: left;
  border-bottom: 1px solid var(--border);
}
.tbl td { padding: 11px 14px; font-size: 13px; border-bottom: 1px solid rgba(255,255,255,0.05); }
[data-theme="light"] .tbl td { border-bottom-color: rgba(0,0,0,0.05); }
.tbl tr:last-child td { border-bottom: none; }
.tbl tr:hover td { background: rgba(79,142,247,0.05); transition: background var(--transition); }

/* ─────────────────────────────────────────────────────
   PILLS
───────────────────────────────────────────────────── */
.pill-row { display: flex; gap: 8px; flex-wrap: wrap; }
.pill {
  padding: 8px 18px; border-radius: 100px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.07);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  color: var(--text2);
  cursor: pointer; font-size: 13px; font-weight: 600;
  transition: all var(--spring);
  user-select: none;
}
.pill.active {
  border-color: rgba(79,142,247,0.55);
  background: rgba(79,142,247,0.18);
  color: var(--accent);
  box-shadow: 0 0 14px rgba(79,142,247,0.22), 0 1px 0 rgba(255,255,255,0.14) inset;
  transform: scale(1.03);
}
.pill:hover:not(.active) { background: rgba(255,255,255,0.12); color: var(--text); transform: scale(1.02); }

[data-theme="light"] .pill {
  background: rgba(255,255,255,0.35);
  border-color: rgba(180,200,240,0.50);
  color: var(--text2);
}
[data-theme="light"] .pill:hover:not(.active) { background: rgba(255,255,255,0.60); }

/* ─────────────────────────────────────────────────────
   DROPDOWN
───────────────────────────────────────────────────── */
.dropdown-wrap { position: relative; }
.dropdown-list {
  position: absolute; top: calc(100% + 6px);
  left: 0; right: 0;
  background: rgba(10,14,28,0.88);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-top-color: rgba(255,255,255,0.22);
  border-radius: var(--radius-sm);
  max-height: 210px; overflow-y: auto;
  z-index: 200; display: none;
  box-shadow: 0 14px 44px rgba(0,0,0,0.55), 0 1px 0 rgba(255,255,255,0.09) inset;
  animation: cardIn 0.20s ease both;
}
[data-theme="light"] .dropdown-list {
  background: rgba(245,248,255,0.88);
  border-color: rgba(200,215,245,0.65);
  box-shadow: 0 14px 40px rgba(80,110,200,0.18), 0 1px 0 rgba(255,255,255,0.95) inset;
}
.dropdown-list.open { display: block; }
.dropdown-item {
  padding: 9px 13px; font-size: 13px; cursor: pointer;
  color: var(--text); transition: background var(--transition);
}
.dropdown-item:hover { background: rgba(79,142,247,0.10); }
[data-theme="light"] .dropdown-item:hover { background: rgba(79,142,247,0.08); }
.selected-tag {
  margin-top: 7px; padding: 6px 12px;
  background: rgba(79,142,247,0.12);
  border: 1px solid rgba(79,142,247,0.30);
  border-radius: var(--radius-sm);
  font-size: 12px; color: var(--accent); font-weight: 600; display: none;
}

/* ─────────────────────────────────────────────────────
   CLASS GRID CHIPS
───────────────────────────────────────────────────── */
.class-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 7px; margin-top: 12px; }
.class-chip {
  padding: 9px 6px; border-radius: var(--radius-sm); text-align: center;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  color: var(--text2); cursor: pointer; font-size: 13px; font-weight: 600;
  transition: all var(--spring);
}
.class-chip:hover { transform: scale(1.03); background: rgba(255,255,255,0.12); }
.class-chip.active {
  border-color: rgba(155,111,240,0.50);
  background: rgba(155,111,240,0.18);
  color: #c4b5fd;
  box-shadow: 0 0 14px rgba(155,111,240,0.24);
  transform: scale(1.03);
}
[data-theme="light"] .class-chip {
  background: rgba(255,255,255,0.35);
  border-color: rgba(180,200,240,0.50);
}
[data-theme="light"] .class-chip.active {
  background: rgba(155,111,240,0.16);
  color: #5b21b6;
  border-color: rgba(155,111,240,0.40);
}

/* ─────────────────────────────────────────────────────
   PHOTO ZONE
───────────────────────────────────────────────────── */
.photo-zone {
  border: 1.5px dashed rgba(255,255,255,0.18); border-radius: var(--radius);
  padding: 28px; text-align: center; cursor: pointer;
  background: rgba(255,255,255,0.04);
  position: relative; transition: border-color var(--transition), background var(--transition);
}
.photo-zone:hover { border-color: rgba(79,142,247,0.50); background: rgba(79,142,247,0.06); }
[data-theme="light"] .photo-zone {
  border-color: rgba(180,200,240,0.50);
  background: rgba(255,255,255,0.25);
}
.photo-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.photo-preview {
  width: 100px; height: 100px; border-radius: 50%; object-fit: cover;
  margin: 0 auto 10px; display: none;
  border: 2px solid rgba(79,142,247,0.55);
  box-shadow: 0 0 24px rgba(79,142,247,0.30);
}

/* ─────────────────────────────────────────────────────
   SIDEBAR / APP LAYOUT
───────────────────────────────────────────────────── */
.app-layout { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }

.sidebar {
  background: rgba(255,255,255,0.04);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  padding: 16px;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  box-shadow: 1px 0 0 rgba(255,255,255,0.06);
}
[data-theme="light"] .sidebar {
  background: rgba(255,255,255,0.22);
  border-right-color: rgba(200,215,245,0.50);
  box-shadow: 2px 0 20px rgba(80,110,200,0.08);
}

.sidebar-logo { display: flex; align-items: center; gap: 10px; padding: 8px 10px; margin-bottom: 20px; }
.sidebar-logo-icon {
  font-size: 22px;
  filter: drop-shadow(0 0 10px rgba(79,142,247,0.50));
  animation: orbPulse 4s ease-in-out infinite;
}
.sidebar-logo-text { font-size: 14px; font-weight: 800; color: var(--text); }
.sidebar-logo-text span { color: var(--accent); }

.nav-section-label {
  font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--text3); padding: 12px 10px 4px;
}
.nav-btn {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; color: var(--text2);
  cursor: pointer; border: none; background: transparent;
  font-family: var(--font); transition: all var(--transition);
  width: 100%; text-align: left;
}
.nav-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text);
  transform: translateX(2px);
}
[data-theme="light"] .nav-btn:hover {
  background: rgba(255,255,255,0.45);
}
.nav-btn.active {
  background: rgba(79,142,247,0.14);
  color: var(--accent);
  border-left: 2px solid var(--accent);
  padding-left: 10px; /* compensate for border-left so text doesn't shift */
  box-shadow: inset 0 0 14px rgba(79,142,247,0.10);
}
[data-theme="light"] .nav-btn.active {
  background: rgba(79,142,247,0.10);
  border-left-color: var(--accent);
}
.nav-icon { font-size: 15px; width: 20px; text-align: center; flex-shrink: 0; }

.sidebar-bottom {
  margin-top: auto; padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 6px;
}
.user-chip {
  display: flex; align-items: center; gap: 10px; padding: 10px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-top-color: var(--border-top);
}
[data-theme="light"] .user-chip {
  background: rgba(255,255,255,0.35);
  border-color: rgba(200,215,245,0.55);
}
.user-av {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800; color: #fff; flex-shrink: 0;
  box-shadow: 0 0 14px rgba(79,142,247,0.38);
}
.user-name  { font-size: 12px; font-weight: 600; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-email { font-size: 11px; color: var(--text3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.main-area { padding: 28px; overflow-y: auto; background: transparent; }
.page-view { display: none; }
.page-view.active { display: block; }
.page-title    { font-size: 1.4rem; font-weight: 800; color: var(--text); margin-bottom: 4px; }
.page-subtitle { font-size: 13px; color: var(--text2); margin-bottom: 24px; }

/* ─────────────────────────────────────────────────────
   STAT CARDS
───────────────────────────────────────────────────── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(150px,1fr)); gap: 12px; margin-bottom: 24px; }
.stat-card {
  padding: 20px; border-radius: var(--radius);
  background: var(--card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-top-color: var(--border-top);
  box-shadow: var(--shadow);
  transition: transform var(--spring), box-shadow var(--transition);
}
.stat-card:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 16px 44px rgba(0,0,0,0.40), 0 1px 0 rgba(255,255,255,0.14) inset;
}
[data-theme="light"] .stat-card {
  background: linear-gradient(145deg, rgba(255,255,255,0.30) 0%, rgba(255,255,255,0.14) 100%);
}
[data-theme="light"] .stat-card:hover {
  box-shadow: 0 12px 36px rgba(80,110,200,0.22), 0 1px 0 rgba(255,255,255,0.95) inset;
}
.stat-label { font-size: 10px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--text3); margin-bottom: 6px; }
.stat-val   { font-size: 1.8rem; font-weight: 800; color: var(--text); line-height: 1; }
.stat-sub   { font-size: 11px; color: var(--text3); margin-top: 4px; }

/* ─────────────────────────────────────────────────────
   SUBJECT CARDS
───────────────────────────────────────────────────── */
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(200px,1fr)); gap: 14px; }
.subject-card {
  padding: 20px; border-radius: var(--radius);
  background: var(--card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-top-color: var(--border-top);
  box-shadow: var(--shadow);
  cursor: pointer; transition: all var(--spring);
}
.subject-card:hover {
  transform: translateY(-4px) scale(1.015);
  border-color: rgba(79,142,247,0.45);
  box-shadow: 0 18px 50px rgba(0,0,0,0.38), 0 0 24px rgba(79,142,247,0.16), 0 1px 0 rgba(255,255,255,0.18) inset;
}
[data-theme="light"] .subject-card {
  background: linear-gradient(145deg, rgba(255,255,255,0.30) 0%, rgba(255,255,255,0.12) 100%);
}
[data-theme="light"] .subject-card:hover {
  box-shadow: 0 14px 44px rgba(80,110,200,0.24), 0 0 20px rgba(79,142,247,0.12), 0 1px 0 rgba(255,255,255,0.95) inset;
}
.subj-icon { font-size: 28px; margin-bottom: 10px; }
.subj-name { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.subj-meta { font-size: 11px; color: var(--text3); display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.diff-row { display: flex; gap: 5px; flex-wrap: wrap; }
.diff-chip {
  padding: 3px 10px; border-radius: 100px; font-size: 11px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; transition: all var(--spring);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.diff-chip:hover { transform: scale(1.06); filter: brightness(1.15) saturate(1.2); }
.diff-easy { background: rgba(45,218,128,0.12);  color: #6ee7b7; border-color: rgba(45,218,128,0.26); }
.diff-mod  { background: rgba(255,209,102,0.12); color: #fcd34d; border-color: rgba(255,209,102,0.26); }
.diff-hard { background: rgba(255,95,109,0.12);  color: #fca5a5; border-color: rgba(255,95,109,0.26); }

[data-theme="light"] .diff-easy { color: #15803d; }
[data-theme="light"] .diff-mod  { color: #92400e; background: rgba(255,180,40,0.14); border-color: rgba(255,180,40,0.28); }
[data-theme="light"] .diff-hard { color: #b91c1c; }

/* ─────────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .app-layout { grid-template-columns: 200px 1fr; }
  .main-area  { padding: 22px; }
  .subject-grid { grid-template-columns: repeat(auto-fill,minmax(170px,1fr)); }
  .stat-grid    { grid-template-columns: repeat(auto-fill,minmax(130px,1fr)); }
}

@media (max-width: 768px) {
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
    grid-template-areas: "main" "sidebar";
    height: 100dvh; overflow: hidden;
  }
  .main-area { grid-area: main; overflow-y: auto; padding: 16px 14px 80px; }
  .sidebar {
    grid-area: sidebar; position: fixed;
    bottom: 0; left: 0; right: 0; height: 62px;
    flex-direction: row; align-items: stretch;
    padding: 0;
    border-top: 1px solid var(--border); border-right: none;
    background: rgba(8,10,18,0.80);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    z-index: 500; overflow: visible; gap: 0;
    box-shadow: 0 -4px 32px rgba(0,0,0,0.40), 0 -1px 0 rgba(255,255,255,0.10);
  }
  [data-theme="light"] .sidebar {
    background: rgba(240,245,255,0.78);
    box-shadow: 0 -4px 24px rgba(80,110,200,0.18), 0 -1px 0 rgba(255,255,255,0.85);
  }
  .nav-section-label, .sidebar-logo, .sidebar-bottom { display: none; }
  .nav-btn {
    flex: 1; display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 3px;
    padding: 6px 2px; min-width: 0; width: auto; height: 100%;
    border-left: none; border-top: 2px solid transparent;
    border-radius: 0; font-size: 9.5px; font-weight: 600;
    color: var(--text3); letter-spacing: 0.2px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    background: transparent; transform: none;
  }
  .nav-btn .nav-icon { font-size: 18px; width: auto; display: block; line-height: 1; }
  .nav-btn:hover { background: rgba(255,255,255,0.06); color: var(--text2); transform: none; }
  .nav-btn.active { background: transparent; color: var(--accent); border-left: none; border-top: 2px solid var(--accent); }
  .nav-btn-label { display: block; }
  .class-grid    { grid-template-columns: repeat(3,1fr); }
  .page-title    { font-size: 1.2rem; }
  .auth-wrap     { padding: 28px 22px; }
  .step-label    { display: none; }
  .step-item.active .step-label { display: inline; }
}

@media (max-width: 480px) {
  body         { font-size: 13px; }
  .main-area   { padding: 12px; }
  .card        { border-radius: var(--radius-sm); }
  .btn         { padding: 9px 14px; font-size: 12.5px; }
  .class-grid  { grid-template-columns: repeat(2,1fr); }
  .subject-grid{ grid-template-columns: repeat(auto-fill,minmax(140px,1fr)); gap: 10px; }
  .stat-grid   { grid-template-columns: repeat(2,1fr); gap: 8px; }
  .stat-card   { padding: 14px; }
  .stat-val    { font-size: 1.4rem; }
  .page-title  { font-size: 1.05rem; }
  .toast       { left: 12px; right: 12px; max-width: none; }
  .tbl th, .tbl td { padding: 8px; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .orb { animation: none !important; }
  .btn::after { display: none; }
  .prog-fill::after { animation: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}