/* ==========================================================================
   KAHOK YADIKA — CBT Design System
   Glassmorphism · Modern · Minimal · Premium SaaS
   Font: Inter
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand palette */
  --primary: #2563EB;
  --primary-600: #1D4ED8;
  --primary-400: #60A5FA;
  --secondary: #7C3AED;
  --secondary-600: #6D28D9;
  --accent: #22C55E;
  --accent-600: #16A34A;
  --warning: #F59E0B;
  --danger: #EF4444;

  /* Gradients */
  --grad-brand: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
  --grad-brand-soft: linear-gradient(135deg, rgba(37,99,235,.14), rgba(124,58,237,.14));
  --grad-accent: linear-gradient(135deg, #22C55E 0%, #2563EB 100%);
  --grad-sunset: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
  --grad-violet: linear-gradient(135deg, #7C3AED 0%, #EC4899 100%);
  --grad-mesh:
    radial-gradient(60rem 60rem at 10% -10%, rgba(37,99,235,.30), transparent 60%),
    radial-gradient(50rem 50rem at 100% 0%, rgba(124,58,237,.28), transparent 55%),
    radial-gradient(45rem 45rem at 50% 120%, rgba(34,197,94,.18), transparent 55%);

  /* Radius */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --r-2xl: 36px;
  --r-full: 999px;

  /* Spacing scale */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 20px; --s-6: 24px; --s-8: 32px; --s-10: 40px;
  --s-12: 48px; --s-16: 64px; --s-20: 80px;

  /* Typography */
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --fw-normal: 400; --fw-medium: 500; --fw-semi: 600; --fw-bold: 700; --fw-black: 800;

  /* Motion */
  --ease: cubic-bezier(.22,.61,.36,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --dur: .28s;

  /* ----- Light theme (default) ----- */
  --bg: #EEF2FB;
  --bg-2: #E4EAF7;
  --text: #0F172A;
  --text-soft: #475569;
  --text-mut: #94A3B8;
  --glass: rgba(255,255,255,.62);
  --glass-2: rgba(255,255,255,.45);
  --glass-brd: rgba(255,255,255,.75);
  --glass-brd-2: rgba(15,23,42,.06);
  --card: rgba(255,255,255,.72);
  --shadow: 0 12px 40px -12px rgba(23,37,84,.28);
  --shadow-sm: 0 6px 20px -8px rgba(23,37,84,.22);
  --ring: rgba(37,99,235,.16);
  --sidebar: rgba(255,255,255,.55);
}

[data-theme="dark"] {
  --bg: #070B18;
  --bg-2: #0B1223;
  --text: #F1F5F9;
  --text-soft: #AEB8CC;
  --text-mut: #64748B;
  --glass: rgba(20,28,48,.55);
  --glass-2: rgba(30,41,66,.40);
  --glass-brd: rgba(148,163,184,.16);
  --glass-brd-2: rgba(255,255,255,.06);
  --card: rgba(19,26,45,.62);
  --shadow: 0 24px 60px -20px rgba(0,0,0,.7);
  --shadow-sm: 0 10px 30px -14px rgba(0,0,0,.6);
  --ring: rgba(96,165,250,.24);
  --sidebar: rgba(13,19,36,.55);
  --grad-mesh:
    radial-gradient(60rem 60rem at 8% -12%, rgba(37,99,235,.38), transparent 60%),
    radial-gradient(52rem 52rem at 102% -4%, rgba(124,58,237,.36), transparent 55%),
    radial-gradient(48rem 48rem at 50% 122%, rgba(34,197,94,.16), transparent 55%);
}

/* ---------- Reset & Base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  background-image: var(--grad-mesh);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .4s var(--ease), color .3s var(--ease);
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
::selection { background: rgba(37,99,235,.28); }

/* Scrollbar */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-thumb { background: var(--text-mut); border-radius: 99px; border: 3px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- Typography helpers ---------- */
h1,h2,h3,h4 { line-height: 1.15; letter-spacing: -.02em; font-weight: var(--fw-bold); }
.h-display { font-size: clamp(2rem, 4vw, 3rem); font-weight: var(--fw-black); letter-spacing: -.035em; }
.h1 { font-size: clamp(1.6rem, 2.6vw, 2.1rem); font-weight: var(--fw-black); }
.h2 { font-size: 1.35rem; font-weight: var(--fw-bold); }
.h3 { font-size: 1.08rem; font-weight: var(--fw-semi); }
.muted { color: var(--text-soft); }
.dim { color: var(--text-mut); }
.eyebrow { text-transform: uppercase; letter-spacing: .16em; font-size: .72rem; font-weight: var(--fw-bold); color: var(--text-mut); }
.grad-text {
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- Glass primitives ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-brd);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  box-shadow: var(--shadow);
}
.card {
  background: var(--card);
  border: 1px solid var(--glass-brd);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.card-hover:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(37,99,235,.35); }
.pad { padding: var(--s-6); }
.pad-lg { padding: var(--s-8); }

/* ---------- Buttons ---------- */
.btn {
  --bg-btn: var(--glass);
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 11px 20px; border-radius: var(--r-full); border: 1px solid var(--glass-brd);
  background: var(--bg-btn); font-weight: var(--fw-semi); font-size: .92rem;
  cursor: pointer; white-space: nowrap; user-select: none;
  transition: transform .18s var(--ease-spring), box-shadow var(--dur) var(--ease), filter var(--dur), background var(--dur), border-color var(--dur);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(.98); }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--grad-brand); color: #fff; border: none; box-shadow: 0 10px 24px -8px rgba(37,99,235,.6); }
.btn-primary:hover { box-shadow: 0 16px 34px -8px rgba(37,99,235,.7); filter: brightness(1.05); }
.btn-accent { background: var(--grad-accent); color: #fff; border: none; box-shadow: 0 10px 24px -8px rgba(34,197,94,.55); }
.btn-ghost { background: var(--glass-2); }
.btn-ghost:hover { background: var(--glass); border-color: rgba(37,99,235,.35); }
.btn-danger { background: var(--danger); color: #fff; border: none; }
.btn-lg { padding: 15px 30px; font-size: 1rem; }
.btn-sm { padding: 8px 14px; font-size: .82rem; }
.btn-icon { width: 42px; height: 42px; padding: 0; border-radius: var(--r-md); }
.btn-block { width: 100%; }

/* ---------- Chips / badges ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px;
  border-radius: var(--r-full); font-size: .76rem; font-weight: var(--fw-semi);
  background: var(--glass-2); border: 1px solid var(--glass-brd);
}
.badge { display:inline-flex; align-items:center; gap:6px; padding: 4px 11px; border-radius: var(--r-full); font-size:.74rem; font-weight: var(--fw-bold); }
.badge-primary { background: rgba(37,99,235,.14); color: var(--primary); }
.badge-secondary { background: rgba(124,58,237,.14); color: var(--secondary); }
.badge-accent { background: rgba(34,197,94,.16); color: var(--accent-600); }
.badge-warn { background: rgba(245,158,11,.16); color: var(--warning); }
.badge-danger { background: rgba(239,68,68,.15); color: var(--danger); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: currentColor; }

/* ---------- Inputs ---------- */
.field { display: flex; flex-direction: column; gap: 7px; }
.label { font-size: .82rem; font-weight: var(--fw-semi); color: var(--text-soft); }
.input, .select, .textarea {
  width: 100%; padding: 13px 15px; border-radius: var(--r-md);
  background: var(--glass-2); border: 1px solid var(--glass-brd);
  transition: border-color var(--dur), box-shadow var(--dur), background var(--dur);
  outline: none; color: var(--text);
}
.input::placeholder { color: var(--text-mut); }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--primary); background: var(--glass); box-shadow: 0 0 0 4px var(--ring);
}
.input-icon { position: relative; }
.input-icon svg { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); width: 19px; height: 19px; color: var(--text-mut); }
.input-icon .input { padding-left: 44px; }

/* ---------- Avatar ---------- */
.avatar { width: 40px; height: 40px; border-radius: 50%; display:grid; place-items:center; font-weight: var(--fw-bold); color:#fff; background: var(--grad-brand); flex: none; box-shadow: var(--shadow-sm); }
.avatar-lg { width: 84px; height: 84px; font-size: 1.8rem; }
.avatar-sm { width: 32px; height: 32px; font-size:.78rem; }

/* ---------- Progress ---------- */
.progress { height: 10px; border-radius: 99px; background: var(--glass-2); overflow: hidden; border: 1px solid var(--glass-brd-2); }
.progress > i { display:block; height:100%; border-radius:99px; background: var(--grad-brand); transition: width .6s var(--ease); }

/* ---------- Layout: app shell ---------- */
.app { display: grid; grid-template-columns: 264px 1fr; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; padding: var(--s-6) var(--s-4);
  display: flex; flex-direction: column; gap: var(--s-2);
  background: var(--sidebar); border-right: 1px solid var(--glass-brd);
  backdrop-filter: blur(24px) saturate(160%); -webkit-backdrop-filter: blur(24px) saturate(160%);
  z-index: 40;
}
.brand { display: flex; align-items: center; gap: 11px; padding: 6px 10px 18px; }
.brand .logo { width: 40px; height: 40px; border-radius: 12px; background: var(--grad-brand); display: grid; place-items: center; color: #fff; font-weight: var(--fw-black); box-shadow: 0 8px 20px -6px rgba(37,99,235,.6); flex: none; }
.brand b { font-size: 1.12rem; font-weight: var(--fw-black); letter-spacing: -.02em; }
.brand small { display:block; font-size:.68rem; color: var(--text-mut); font-weight: var(--fw-medium); letter-spacing:.02em; }
.nav-label { font-size: .68rem; text-transform: uppercase; letter-spacing: .14em; color: var(--text-mut); font-weight: var(--fw-bold); padding: 14px 12px 6px; }
.nav-item {
  display: flex; align-items: center; gap: 12px; padding: 11px 13px; border-radius: var(--r-md);
  color: var(--text-soft); font-weight: var(--fw-medium); font-size: .92rem; cursor: pointer;
  transition: background var(--dur), color var(--dur), transform .15s var(--ease);
}
.nav-item svg { width: 20px; height: 20px; flex: none; }
.nav-item:hover { background: var(--glass-2); color: var(--text); transform: translateX(2px); }
.nav-item.active { background: var(--grad-brand); color: #fff; box-shadow: 0 10px 22px -10px rgba(37,99,235,.7); }
.nav-item .tag { margin-left: auto; font-size: .68rem; padding: 2px 8px; border-radius: 99px; background: rgba(239,68,68,.15); color: var(--danger); font-weight: var(--fw-bold); }
.sidebar .spacer { flex: 1; }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: var(--s-4);
  padding: var(--s-4) var(--s-8);
  background: var(--glass-2); border-bottom: 1px solid var(--glass-brd);
  backdrop-filter: blur(20px) saturate(150%); -webkit-backdrop-filter: blur(20px) saturate(150%);
}
.topbar .search { flex: 1; max-width: 420px; }
.topbar .spacer { flex: 1; }
.content { padding: var(--s-8); max-width: 1320px; width: 100%; margin: 0 auto; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--s-4); flex-wrap: wrap; margin-bottom: var(--s-8); }

/* icon button ghost */
.iconbtn { width: 42px; height: 42px; border-radius: var(--r-md); display: grid; place-items: center; cursor: pointer; background: var(--glass-2); border: 1px solid var(--glass-brd); transition: background var(--dur), transform .15s var(--ease-spring), color var(--dur); }
.iconbtn:hover { background: var(--glass); transform: translateY(-2px); }
.iconbtn svg { width: 20px; height: 20px; }

/* mobile menu toggle */
.menu-toggle { display: none; }

/* ---------- Grid utilities ---------- */
.grid { display: grid; gap: var(--s-6); }
.g-2 { grid-template-columns: repeat(2,1fr); }
.g-3 { grid-template-columns: repeat(3,1fr); }
.g-4 { grid-template-columns: repeat(4,1fr); }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--s-2); } .gap-3 { gap: var(--s-3); } .gap-4 { gap: var(--s-4); } .gap-6 { gap: var(--s-6); }
.wrap { flex-wrap: wrap; }
.col { display: flex; flex-direction: column; }
.mt-2{margin-top:var(--s-2)} .mt-4{margin-top:var(--s-4)} .mt-6{margin-top:var(--s-6)} .mt-8{margin-top:var(--s-8)}
.text-c { text-align: center; }
.hide { display: none !important; }

/* ---------- Stat card ---------- */
.stat { display: flex; flex-direction: column; gap: 10px; }
.stat .ico { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; color: #fff; }
.stat .num { font-size: 1.9rem; font-weight: var(--fw-black); letter-spacing: -.03em; }
.stat .lbl { color: var(--text-soft); font-size: .86rem; font-weight: var(--fw-medium); }
.trend { font-size: .78rem; font-weight: var(--fw-bold); }
.trend.up { color: var(--accent-600); } .trend.down { color: var(--danger); }

/* ---------- Table ---------- */
.table { width: 100%; border-collapse: separate; border-spacing: 0 8px; }
.table th { text-align: left; font-size: .74rem; text-transform: uppercase; letter-spacing: .1em; color: var(--text-mut); font-weight: var(--fw-bold); padding: 6px 16px; }
.table td { padding: 14px 16px; background: var(--glass-2); border-top: 1px solid var(--glass-brd-2); border-bottom: 1px solid var(--glass-brd-2); }
.table tr td:first-child { border-left: 1px solid var(--glass-brd-2); border-radius: var(--r-md) 0 0 var(--r-md); }
.table tr td:last-child { border-right: 1px solid var(--glass-brd-2); border-radius: 0 var(--r-md) var(--r-md) 0; }
.table tbody tr { transition: transform .15s var(--ease); }
.table tbody tr:hover td { background: var(--glass); }

/* ---------- Theme toggle ---------- */
.theme-toggle { position: relative; width: 42px; height: 42px; }
.theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

/* ==========================================================================
   AUTH (Login)
   ========================================================================== */
.auth { display: grid; grid-template-columns: 1.05fr .95fr; min-height: 100vh; }
.auth-hero {
  position: relative; overflow: hidden; padding: var(--s-16);
  display: flex; flex-direction: column; justify-content: space-between;
  background: var(--grad-brand); color: #fff;
}
.auth-hero .blob { position: absolute; border-radius: 50%; filter: blur(10px); opacity: .5; }
.auth-hero .b1 { width: 380px; height: 380px; background: rgba(255,255,255,.18); top: -120px; right: -80px; }
.auth-hero .b2 { width: 300px; height: 300px; background: rgba(34,197,94,.35); bottom: -100px; left: -60px; filter: blur(30px); }
.auth-form-wrap { display: grid; place-items: center; padding: var(--s-8); }
.auth-card { width: 100%; max-width: 430px; border-radius: var(--r-2xl); padding: var(--s-10); }
.divider { display: flex; align-items: center; gap: 12px; color: var(--text-mut); font-size: .8rem; margin: var(--s-2) 0; }
.divider::before, .divider::after { content: ""; height: 1px; flex: 1; background: var(--glass-brd); }
.floaty { position: absolute; border-radius: var(--r-lg); padding: 14px 18px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.24); backdrop-filter: blur(10px); }

/* ==========================================================================
   JOIN
   ========================================================================== */
.join-wrap { min-height: 100vh; display: grid; place-items: center; padding: var(--s-8); }
.pin-inputs { display: flex; gap: 12px; justify-content: center; }
.pin-inputs input {
  width: 62px; height: 76px; text-align: center; font-size: 2rem; font-weight: var(--fw-black);
  border-radius: var(--r-lg); background: var(--glass-2); border: 2px solid var(--glass-brd);
  outline: none; transition: border-color var(--dur), transform .15s var(--ease-spring), box-shadow var(--dur);
}
.pin-inputs input:focus { border-color: var(--primary); transform: translateY(-3px); box-shadow: 0 0 0 5px var(--ring); }

/* ==========================================================================
   QUESTION PAGE
   ========================================================================== */
.exam-bar { position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: var(--s-4); padding: 14px var(--s-8); border-bottom: 1px solid var(--glass-brd); }
.exam-layout { display: grid; grid-template-columns: 1fr 300px; gap: var(--s-6); padding: var(--s-8); max-width: 1400px; margin: 0 auto; width: 100%; align-items: start; }
.q-card { border-radius: var(--r-2xl); padding: clamp(20px,3vw,44px); animation: qin .5s var(--ease) both; }
@keyframes qin { from { opacity: 0; transform: translateY(16px) scale(.99); } to { opacity: 1; transform: none; } }
.q-title { font-size: clamp(1.25rem, 2.2vw, 1.7rem); font-weight: var(--fw-bold); line-height: 1.32; letter-spacing: -.02em; }

/* Timer ring */
.timer-ring { position: relative; width: 58px; height: 58px; flex: none; }
.timer-ring svg { transform: rotate(-90deg); width: 100%; height: 100%; }
.timer-ring .bg { fill: none; stroke: var(--glass-brd); stroke-width: 6; }
.timer-ring .fg { fill: none; stroke: url(#tgrad); stroke-width: 6; stroke-linecap: round; transition: stroke-dashoffset 1s linear, stroke .4s; }
.timer-ring .t { position: absolute; inset: 0; display: grid; place-items: center; font-weight: var(--fw-black); font-size: .82rem; }

/* Answer options */
.options { display: grid; gap: 14px; margin-top: var(--s-8); }
.opt {
  display: flex; align-items: center; gap: 16px; padding: 18px 20px; border-radius: var(--r-lg);
  background: var(--glass-2); border: 2px solid var(--glass-brd); cursor: pointer;
  transition: transform .18s var(--ease-spring), border-color var(--dur), background var(--dur), box-shadow var(--dur);
}
.opt:hover { transform: translateY(-3px); border-color: rgba(37,99,235,.5); }
.opt .key { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; font-weight: var(--fw-black); background: var(--glass); flex: none; transition: all var(--dur); }
.opt .txt { font-weight: var(--fw-medium); }
.opt.selected { border-color: var(--primary); background: var(--grad-brand-soft); box-shadow: 0 0 0 4px var(--ring); }
.opt.selected .key { background: var(--grad-brand); color: #fff; }
.opt.correct { border-color: var(--accent); background: rgba(34,197,94,.12); }
.opt.correct .key { background: var(--accent); color: #fff; }
.opt.wrong { border-color: var(--danger); background: rgba(239,68,68,.1); }
.opt.wrong .key { background: var(--danger); color: #fff; }

/* Question navigator */
.qnav-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.qnav-btn {
  aspect-ratio: 1; border-radius: 12px; display: grid; place-items: center; cursor: pointer;
  font-weight: var(--fw-bold); font-size: .88rem; background: var(--glass-2);
  border: 1px solid var(--glass-brd); position: relative; transition: transform .15s var(--ease-spring), background var(--dur), color var(--dur);
}
.qnav-btn:hover { transform: scale(1.08); }
.qnav-btn.answered { background: rgba(34,197,94,.18); color: var(--accent-600); border-color: rgba(34,197,94,.4); }
.qnav-btn.current { background: var(--grad-brand); color: #fff; border: none; box-shadow: 0 6px 16px -6px rgba(37,99,235,.7); }
.qnav-btn.flagged::after { content: ""; position: absolute; top: 5px; right: 5px; width: 7px; height: 7px; border-radius: 50%; background: var(--warning); }

/* autosave */
.autosave { display: inline-flex; align-items: center; gap: 7px; font-size: .8rem; font-weight: var(--fw-semi); color: var(--accent-600); }
.autosave .pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 1.8s infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(34,197,94,.5); } 50% { box-shadow: 0 0 0 6px rgba(34,197,94,0); } }
.autosave.saving { color: var(--warning); } .autosave.saving .pulse { background: var(--warning); }

/* ==========================================================================
   RESULT
   ========================================================================== */
.score-ring { position: relative; width: 220px; height: 220px; margin: 0 auto; }
.score-ring svg { transform: rotate(-90deg); width: 100%; height: 100%; }
.score-ring .bg { fill: none; stroke: var(--glass-brd); stroke-width: 16; }
.score-ring .fg { fill: none; stroke: url(#sgrad); stroke-width: 16; stroke-linecap: round; }
.score-ring .mid { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; }
.score-ring .mid b { font-size: 3.4rem; font-weight: var(--fw-black); letter-spacing: -.04em; line-height: 1; }
.confetti { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 5; }
.confetti i { position: absolute; width: 9px; height: 14px; top: -20px; border-radius: 2px; animation: fall linear infinite; }
@keyframes fall { to { transform: translateY(105vh) rotate(720deg); } }

/* ==========================================================================
   LEADERBOARD
   ========================================================================== */
.podium { display: grid; grid-template-columns: 1fr 1.2fr 1fr; gap: var(--s-4); align-items: end; }
.pod { border-radius: var(--r-xl); padding: var(--s-6); text-align: center; position: relative; }
.pod .rank-crown { font-size: 1.6rem; }
.pod-1 { background: linear-gradient(160deg, rgba(245,158,11,.24), var(--card)); border: 1px solid rgba(245,158,11,.4); }
.pod-2 { background: linear-gradient(160deg, rgba(148,163,184,.22), var(--card)); }
.pod-3 { background: linear-gradient(160deg, rgba(180,120,60,.22), var(--card)); }
.rank-badge { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font-weight: var(--fw-black); flex: none; }
.rank-1 { background: var(--grad-sunset); color: #fff; }
.rank-2 { background: linear-gradient(135deg,#94A3B8,#CBD5E1); color:#fff; }
.rank-3 { background: linear-gradient(135deg,#B45309,#D97706); color:#fff; }

/* ==========================================================================
   PROFILE
   ========================================================================== */
.cover { height: 180px; border-radius: var(--r-2xl); background: var(--grad-violet); position: relative; overflow: hidden; }
.cover .blob { position:absolute; border-radius:50%; background: rgba(255,255,255,.18); filter: blur(20px); }

/* segmented control / tabs */
.tabs { display: inline-flex; gap: 4px; padding: 5px; border-radius: var(--r-full); background: var(--glass-2); border: 1px solid var(--glass-brd); }
.tab { padding: 8px 18px; border-radius: var(--r-full); cursor: pointer; font-weight: var(--fw-semi); font-size: .88rem; color: var(--text-soft); transition: all var(--dur); }
.tab.active { background: var(--grad-brand); color: #fff; box-shadow: var(--shadow-sm); }

/* toggle switch */
.switch { width: 46px; height: 26px; border-radius: 99px; background: var(--glass-2); border: 1px solid var(--glass-brd); position: relative; cursor: pointer; transition: background var(--dur); }
.switch::after { content: ""; position: absolute; width: 20px; height: 20px; border-radius: 50%; background: #fff; top: 2px; left: 2px; box-shadow: var(--shadow-sm); transition: left var(--dur) var(--ease-spring); }
.switch.on { background: var(--grad-brand); }
.switch.on::after { left: 22px; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); animation: reveal .6s var(--ease) forwards; }
@keyframes reveal { to { opacity: 1; transform: none; } }
.d1{animation-delay:.05s}.d2{animation-delay:.12s}.d3{animation-delay:.19s}.d4{animation-delay:.26s}.d5{animation-delay:.33s}.d6{animation-delay:.4s}

/* ==========================================================================
   KAHOOT-PARITY ADD-ONS
   ========================================================================== */

/* ---------- Skeleton loading ---------- */
.skel {
  border-radius: var(--r-md);
  background: linear-gradient(90deg, var(--glass-2) 25%, var(--glass) 40%, var(--glass-2) 55%);
  background-size: 300% 100%;
  animation: shimmer 1.3s ease-in-out infinite;
}
@keyframes shimmer { 0% { background-position: 130% 0; } 100% { background-position: -130% 0; } }
.skel-opt { height: 82px; border-radius: 20px; }

/* ---------- Animated progress bar (moving sheen) ---------- */
.progress > i { position: relative; overflow: hidden; }
.progress > i::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.45), transparent);
  transform: translateX(-100%); animation: sheen 2.2s var(--ease) infinite;
}
@keyframes sheen { 0% { transform: translateX(-100%); } 60%,100% { transform: translateX(200%); } }

/* ---------- Smoother option press ---------- */
.opt:active { transform: scale(.985); }
.opt .key, .opt { will-change: transform; }

/* ---------- Question media ---------- */
.q-media { margin-top: var(--s-6); display: grid; gap: 14px; }
.q-media img, .q-media video {
  width: 100%; max-height: 340px; object-fit: contain; border-radius: var(--r-lg);
  border: 1px solid var(--glass-brd); background: var(--glass-2);
}
.q-media audio { width: 100%; }
.media-tag { display: inline-flex; align-items: center; gap: 6px; font-size: .74rem; font-weight: 700; color: var(--text-mut); }
.media-tag svg { width: 15px; height: 15px; }
mjx-container { max-width: 100%; overflow-x: auto; overflow-y: hidden; }
.video-embed { position: relative; width: 100%; max-width: 560px; aspect-ratio: 16/9; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--glass-brd); background: #000; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ---------- Realtime leaderboard ---------- */
.live-pill { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: var(--r-full); cursor: pointer; font-weight: 700; font-size: .84rem; border: 1px solid var(--glass-brd); background: var(--glass-2); transition: all var(--dur); }
.live-pill.on { background: rgba(239,68,68,.14); color: var(--danger); border-color: rgba(239,68,68,.4); }
.live-pill .live-dot { width: 9px; height: 9px; border-radius: 50%; background: currentColor; }
.live-pill.on .live-dot { animation: pulse-red 1.4s infinite; }
@keyframes pulse-red { 0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,.55); } 50% { box-shadow: 0 0 0 7px rgba(239,68,68,0); } }
#lbTable tbody tr { transition: transform .55s var(--ease-spring), background .3s; }
.row-bump td { animation: rowbump .6s var(--ease); }
@keyframes rowbump { 0% { background: rgba(34,197,94,.22); } 100% { background: var(--glass-2); } }
.pts-pop { display: inline-block; animation: ptspop .5s var(--ease-spring); }
@keyframes ptspop { 0% { transform: scale(1.35); color: var(--accent); } 100% { transform: scale(1); } }
.live-feed { display: flex; flex-direction: column; gap: 8px; max-height: 190px; overflow: hidden; }
.feed-item { animation: feedin .4s var(--ease); font-size: .84rem; }
@keyframes feedin { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ---------- Kahoot-style answer buttons ---------- */
.koptions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: var(--s-8); }
.kopt {
  display: flex; align-items: center; gap: 16px; text-align: left;
  padding: 20px 22px; min-height: 82px; border: 3px solid transparent; border-radius: 20px;
  color: #fff; font-weight: 700; cursor: pointer; position: relative;
  box-shadow: 0 12px 26px -12px rgba(0,0,0,.5);
  transition: transform .16s var(--ease-spring), filter .2s, box-shadow .2s, opacity .25s;
}
.kopt:hover { transform: translateY(-3px); filter: brightness(1.06); box-shadow: 0 18px 34px -12px rgba(0,0,0,.55); }
.kopt:active { transform: scale(.98); }
.kopt .kshape { width: 32px; height: 32px; flex: none; opacity: .95; }
.kopt .kshape svg { width: 100%; height: 100%; display: block; }
.kopt .ktxt { font-size: 1.06rem; line-height: 1.3; }
.kopt .ktxt mjx-container { color: #fff; }
.kopt-0 { background: #EF4444; } /* triangle · danger red */
.kopt-1 { background: #2563EB; } /* diamond · primary blue */
.kopt-2 { background: #F59E0B; } /* circle · warning amber */
.kopt-3 { background: #22C55E; } /* square · accent green */
.kopt.sel { border-color: #fff; box-shadow: 0 0 0 4px rgba(255,255,255,.4), 0 18px 34px -12px rgba(0,0,0,.55); }
.kopt.sel::after { content: "✓"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); font-size: 1.25rem; font-weight: 800; }
/* review states */
.kopt .kcheck { margin-left: auto; font-size: .72rem; padding: 5px 11px; border-radius: 99px; font-weight: 800; white-space: nowrap; background: rgba(255,255,255,.25); color: #fff; }
.kopt.right { border-color: #fff; box-shadow: 0 0 0 4px rgba(255,255,255,.55), 0 0 0 9px rgba(34,197,94,.45); }
.kopt.wrongpick { border-color: #fff; box-shadow: 0 0 0 4px rgba(255,255,255,.55), 0 0 0 9px rgba(239,68,68,.45); }
.kopt.dim { opacity: .45; filter: grayscale(.25); }
@media (max-width: 620px) { .koptions { grid-template-columns: 1fr; } }

/* ---------- Install (PWA) banner ---------- */
.install-banner { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(140%); z-index: 60; display: flex; align-items: center; gap: 14px; padding: 14px 18px; border-radius: var(--r-full); transition: transform .45s var(--ease-spring); }
.install-banner.show { transform: translateX(-50%) translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .g-4 { grid-template-columns: repeat(2,1fr); }
  .exam-layout { grid-template-columns: 1fr; }
  .exam-layout .qnav-side { order: -1; }
}
@media (max-width: 900px) {
  .auth { grid-template-columns: 1fr; }
  .auth-hero { display: none; }
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; left: 0; top: 0; width: 280px; transform: translateX(-105%);
    transition: transform .35s var(--ease); box-shadow: var(--shadow);
  }
  .sidebar.open { transform: none; }
  .menu-toggle { display: grid; }
  .scrim { position: fixed; inset: 0; background: rgba(2,6,23,.5); backdrop-filter: blur(3px); z-index: 39; opacity: 0; pointer-events: none; transition: opacity .3s; }
  .scrim.show { opacity: 1; pointer-events: auto; }
  .content, .topbar { padding-left: var(--s-4); padding-right: var(--s-4); }
}
@media (max-width: 720px) {
  .g-2, .g-3, .g-4, .podium { grid-template-columns: 1fr; }
  .podium { gap: var(--s-3); }
  .pin-inputs input { width: 48px; height: 60px; font-size: 1.5rem; }
  .page-head { align-items: flex-start; }
}