/* ============================================================
   EduSpark — Design System
   Aesthetic: Academic meets modern dark-glass
   Font: Fraunces (display) + DM Sans (body)
   Palette: Deep navy + electric amber + soft cream
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..900;1,9..144,300..900&family=DM+Sans:ital,opsz,wght@0,9..40,300..700;1,9..40,300..700&display=swap');

/* ── CSS Variables ───────────────────────────────────────── */
:root {
  --navy:       #0a0f1e;
  --navy-mid:   #111827;
  --navy-soft:  #1a2440;
  --glass:      rgba(26, 36, 64, 0.7);
  --glass-edge: rgba(255,255,255,0.07);

  --amber:      #f59e0b;
  --amber-glow: rgba(245,158,11,0.18);
  --amber-soft: #fbbf24;
  --cream:      #fef9ef;
  --cream-dim:  #c9c0aa;

  --green:      #10b981;
  --green-glow: rgba(16,185,129,0.15);
  --red:        #ef4444;
  --red-glow:   rgba(239,68,68,0.15);
  --blue:       #3b82f6;

  --text:       #e8e2d6;
  --text-muted: #8b8070;
  --border:     rgba(255,255,255,0.08);

  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  22px;
  --radius-xl:  32px;

  --shadow-sm:  0 2px 8px rgba(0,0,0,.4);
  --shadow-md:  0 8px 32px rgba(0,0,0,.5);
  --shadow-lg:  0 24px 64px rgba(0,0,0,.6);
  --shadow-amber: 0 0 40px rgba(245,158,11,.25);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;

  --transition: 0.22s cubic-bezier(.4,0,.2,1);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--navy);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Starfield background */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(245,158,11,.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(59,130,246,.06) 0%, transparent 50%);
  pointer-events: none;
}

/* ── Typography ──────────────────────────────────────────── */
h1,h2,h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; }
h1 { font-size: clamp(2rem,5vw,3.2rem); }
h2 { font-size: clamp(1.5rem,3vw,2rem); }
h3 { font-size: 1.2rem; }

p { color: var(--text); }
a { color: var(--amber); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--amber-soft); }

small { font-size: .8rem; color: var(--text-muted); }

/* ── Layout ──────────────────────────────────────────────── */
.page { position: relative; z-index: 1; min-height: 100vh; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow { max-width: 640px; }
.container--wide   { max-width: 1300px; }

/* ── Glass Card ──────────────────────────────────────────── */
.card {
  background: var(--glass);
  border: 1px solid var(--glass-edge);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
}

.card--sm { padding: 1.25rem 1.5rem; border-radius: var(--radius-md); }
.card--glow { box-shadow: var(--shadow-md), var(--shadow-amber); }
.card--green { border-color: rgba(16,185,129,.25); box-shadow: var(--shadow-md), 0 0 40px rgba(16,185,129,.12); }

/* ── Navbar ──────────────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(10,15,30,.85);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
}

.navbar__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--amber);
  letter-spacing: -.02em;
}
.navbar__logo span { color: var(--cream); font-weight: 300; }

.navbar__nav { display: flex; align-items: center; gap: 1.5rem; }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-body); font-size: .9rem; font-weight: 600;
  padding: .65rem 1.4rem;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--amber);
  color: var(--navy);
  border-color: var(--amber);
}
.btn--primary:hover {
  background: var(--amber-soft);
  box-shadow: 0 0 24px rgba(245,158,11,.4);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn--ghost:hover {
  background: var(--glass);
  border-color: rgba(255,255,255,.15);
}

.btn--danger {
  background: rgba(239,68,68,.12);
  color: var(--red);
  border-color: rgba(239,68,68,.3);
}
.btn--danger:hover {
  background: rgba(239,68,68,.22);
  box-shadow: 0 0 20px rgba(239,68,68,.25);
}

.btn--success {
  background: rgba(16,185,129,.12);
  color: var(--green);
  border-color: rgba(16,185,129,.3);
}
.btn--success:hover { background: rgba(16,185,129,.22); }

.btn--lg { padding: .9rem 2rem; font-size: 1rem; border-radius: var(--radius-md); }
.btn--full { width: 100%; justify-content: center; }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none !important; }

/* ── Form Controls ───────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: .4rem; margin-bottom: 1.2rem; }
.form-label {
  font-size: .82rem; font-weight: 600; letter-spacing: .04em;
  text-transform: uppercase; color: var(--text-muted);
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  background: rgba(255,255,255,.04);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .7rem 1rem;
  font-family: var(--font-body); font-size: .95rem;
  color: var(--text);
  transition: all var(--transition);
  outline: none;
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--amber);
  background: rgba(245,158,11,.05);
  box-shadow: 0 0 0 3px rgba(245,158,11,.12);
  outline: none;
}
/* Custom select — fully styled replacement for native <select> */
.custom-select {
  position: relative;
  width: 100%;
}
.custom-select__trigger {
  width: 100%;
  background: rgba(255,255,255,.04);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .7rem 2.5rem .7rem 1rem;
  font-family: var(--font-body); font-size: .95rem;
  color: var(--text);
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
  position: relative;
  user-select: none;
  line-height: 1.6;
}
.custom-select__trigger::after {
  content: '';
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 12px; height: 8px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%23f59e0b' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center;
  transition: transform var(--transition);
}
.custom-select.open .custom-select__trigger::after {
  transform: translateY(-50%) rotate(180deg);
}
.custom-select__trigger:hover {
  border-color: rgba(255,255,255,.15);
}
.custom-select.open .custom-select__trigger,
.custom-select__trigger:focus {
  border-color: var(--amber);
  background: rgba(245,158,11,.05);
  box-shadow: 0 0 0 3px rgba(245,158,11,.12);
}
.custom-select__trigger--placeholder {
  color: var(--text-muted);
}
.custom-select__dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0; right: 0;
  z-index: 200;
  background: var(--navy-mid);
  border: 1.5px solid rgba(245,158,11,.3);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md), 0 0 20px rgba(245,158,11,.08);
  max-height: 220px;
  overflow-y: auto;
  padding: 4px;
}
.custom-select.open .custom-select__dropdown {
  display: block;
  animation: scaleIn .15s ease;
}
.custom-select__option {
  padding: .6rem .9rem;
  font-size: .95rem;
  color: var(--text);
  cursor: pointer;
  border-radius: calc(var(--radius-sm) - 2px);
  transition: all .12s ease;
}
.custom-select__option:hover {
  background: var(--amber-glow);
  color: var(--amber);
}
.custom-select__option--selected {
  background: rgba(245,158,11,.1);
  color: var(--amber);
  font-weight: 600;
}
.custom-select__dropdown::-webkit-scrollbar {
  width: 6px;
}
.custom-select__dropdown::-webkit-scrollbar-track {
  background: transparent;
}
.custom-select__dropdown::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,.1);
  border-radius: 3px;
}
.custom-select__dropdown::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,.2);
}

/* Hide the original select when replaced */
select.form-select { display: none; }

/* Number input — custom spinners */
input[type="number"].form-input {
  -moz-appearance: textfield;
  appearance: textfield;
  position: relative;
}
input[type="number"].form-input::-webkit-inner-spin-button,
input[type="number"].form-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  appearance: none;
  margin: 0;
}
.number-input-wrap {
  position: relative;
  display: flex;
}
.number-input-wrap .form-input {
  padding-right: 2.8rem;
  width: 100%;
}
.number-input-wrap__controls {
  position: absolute;
  right: 2px;
  top: 2px;
  bottom: 2px;
  width: 2.2rem;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
}
.number-input-wrap__btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,.04);
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: .7rem;
  line-height: 1;
  transition: all var(--transition);
  border-radius: 0;
}
.number-input-wrap__btn:first-child {
  border-top-right-radius: calc(var(--radius-sm) - 2px);
  border-bottom: 1px solid var(--border);
}
.number-input-wrap__btn:last-child {
  border-bottom-right-radius: calc(var(--radius-sm) - 2px);
}
.number-input-wrap__btn:hover {
  background: var(--amber-glow);
  color: var(--amber);
}
.number-input-wrap__btn:active {
  background: rgba(245,158,11,.2);
}

.form-textarea { resize: vertical; min-height: 100px; }

/* ── Score Badge ─────────────────────────────────────────── */
.score-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 3rem; height: 3rem;
  border-radius: 50%;
  font-family: var(--font-display); font-weight: 800; font-size: 1.1rem;
  border: 2px solid;
}
.score-badge--low    { color: var(--red);   border-color: var(--red);   background: var(--red-glow); }
.score-badge--mid    { color: var(--amber); border-color: var(--amber); background: var(--amber-glow); }
.score-badge--high   { color: var(--green); border-color: var(--green); background: var(--green-glow); }

/* ── Leaderboard ─────────────────────────────────────────── */
.leaderboard { display: flex; flex-direction: column; gap: .5rem; }

.leaderboard__row {
  display: flex; align-items: center; gap: 1rem;
  padding: .75rem 1rem;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  animation: slideIn .3s ease both;
}

.leaderboard__row--first {
  background: var(--amber-glow);
  border-color: rgba(245,158,11,.3);
}

.leaderboard__rank {
  font-family: var(--font-display); font-weight: 800;
  font-size: 1.1rem; width: 2rem; text-align: center;
  color: var(--text-muted);
}
.leaderboard__row--first .leaderboard__rank { color: var(--amber); }

.leaderboard__name { flex: 1; font-weight: 600; }
.leaderboard__pts {
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
  color: var(--amber);
}
.leaderboard__pts span { font-size: .75rem; color: var(--text-muted); font-weight: 400; font-family: var(--font-body); margin-left: .25rem; }

/* ── Join Code Display ───────────────────────────────────── */
.join-code {
  display: flex; align-items: center; justify-content: center; gap: .3rem;
  padding: 1.2rem;
  background: var(--amber-glow);
  border: 2px dashed rgba(245,158,11,.4);
  border-radius: var(--radius-md);
  font-family: var(--font-display); font-size: 2.8rem; font-weight: 900;
  letter-spacing: .25em;
  color: var(--amber);
  box-shadow: var(--shadow-amber);
}

/* ── Question Card ───────────────────────────────────────── */
.question-card {
  padding: 1.25rem;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}
.question-card:hover { border-color: rgba(255,255,255,.12); }
.question-card--evaluated { border-left: 3px solid var(--amber); }

/* ── Status Pill ─────────────────────────────────────────── */
.status-pill {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .25rem .75rem;
  border-radius: 999px;
  font-size: .78rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
}
.status-pill--waiting  { background: rgba(156,163,175,.12); color: #9ca3af; border: 1px solid rgba(156,163,175,.2); }
.status-pill--active   { background: var(--green-glow); color: var(--green); border: 1px solid rgba(16,185,129,.3); }
.status-pill--reviewing{ background: var(--amber-glow); color: var(--amber); border: 1px solid rgba(245,158,11,.3); }
.status-pill--closed   { background: rgba(107,114,128,.1); color: #6b7280; border: 1px solid rgba(107,114,128,.2); }

.status-pill--active::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  animation: pulse 1.5s ease-in-out infinite;
}

/* ── Progress Bar ────────────────────────────────────────── */
.progress { height: 6px; background: rgba(255,255,255,.06); border-radius: 99px; overflow: hidden; }
.progress__fill {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--amber), var(--amber-soft));
  transition: width .4s ease;
}

/* ── Toast ───────────────────────────────────────────────── */
#toast-container {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 9999;
  display: flex; flex-direction: column; gap: .5rem;
}
.toast {
  padding: .85rem 1.25rem;
  background: var(--navy-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: .9rem;
  max-width: 340px;
  animation: toastIn .3s ease;
}
.toast--success { border-color: rgba(16,185,129,.35); color: var(--green); }
.toast--error   { border-color: rgba(239,68,68,.35);  color: var(--red); }
.toast--info    { border-color: rgba(245,158,11,.35); color: var(--amber); }

/* ── Modal ───────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0,0,0,.7);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  animation: fadeIn .2s ease;
}
.modal {
  width: 100%; max-width: 520px;
  background: var(--navy-mid);
  border: 1px solid var(--glass-edge);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  animation: scaleIn .25s cubic-bezier(.34,1.56,.64,1);
}
.modal__title { margin-bottom: 1.5rem; }
.modal__actions { display: flex; gap: .75rem; justify-content: flex-end; margin-top: 2rem; }

/* ── Top-5 Card ──────────────────────────────────────────── */
.top-question {
  padding: 1.5rem;
  background: linear-gradient(135deg, rgba(245,158,11,.06), rgba(245,158,11,.02));
  border: 1px solid rgba(245,158,11,.2);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
.top-question__rank {
  position: absolute; top: 1rem; right: 1.2rem;
  font-family: var(--font-display); font-size: 3rem; font-weight: 900;
  color: rgba(245,158,11,.12);
  line-height: 1;
}
.top-question__text {
  font-family: var(--font-display); font-size: 1.1rem; font-weight: 600;
  margin-bottom: 1rem; padding-right: 3rem;
}
.top-question__meta { display: flex; gap: 1rem; align-items: center; font-size: .85rem; color: var(--text-muted); }

/* ── Stat Grid ───────────────────────────────────────────── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap: 1rem; }
.stat-item {
  padding: 1.25rem;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
}
.stat-item__value {
  font-family: var(--font-display); font-size: 2rem; font-weight: 800;
  color: var(--amber); line-height: 1;
  margin-bottom: .25rem;
}
.stat-item__label { font-size: .78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .05em; }

/* ── Tabs ────────────────────────────────────────────────── */
.tabs { display: flex; gap: .25rem; border-bottom: 1px solid var(--border); margin-bottom: 2rem; }
.tab-btn {
  padding: .6rem 1.2rem; background: transparent; border: none;
  color: var(--text-muted); font-family: var(--font-body); font-size: .9rem; font-weight: 600;
  cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: all var(--transition);
}
.tab-btn--active { color: var(--amber); border-bottom-color: var(--amber); }
.tab-btn:hover:not(.tab-btn--active) { color: var(--text); }
.tab-panel { display: none; }
.tab-panel--active { display: block; }

/* ── QR placeholder ──────────────────────────────────────── */
.qr-wrap {
  width: 180px; height: 180px;
  background: white; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  padding: 10px;
  box-shadow: var(--shadow-amber);
}
.qr-wrap img { width: 100%; height: 100%; object-fit: contain; }
.qr-wrap canvas { width: 100% !important; height: 100% !important; }

/* ── Animations ──────────────────────────────────────────── */
@keyframes slideIn  { from { opacity:0; transform:translateY(8px) } to { opacity:1; transform:translateY(0) } }
@keyframes fadeIn   { from { opacity:0 } to { opacity:1 } }
@keyframes scaleIn  { from { opacity:0; transform:scale(.92) } to { opacity:1; transform:scale(1) } }
@keyframes toastIn  { from { opacity:0; transform:translateX(20px) } to { opacity:1; transform:translateX(0) } }
@keyframes pulse    { 0%,100% { opacity:1 } 50% { opacity:.3 } }
@keyframes spin     { to { transform:rotate(360deg) } }

.animate-in { animation: slideIn .35s ease both; }
.animate-in-delay-1 { animation-delay: .05s; }
.animate-in-delay-2 { animation-delay: .10s; }
.animate-in-delay-3 { animation-delay: .15s; }

/* ── Utility ─────────────────────────────────────────────── */
.hidden  { display: none !important; }
.flex    { display: flex; }
.flex-col{ display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: .5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.mt-1  { margin-top: .5rem; }
.mt-2  { margin-top: 1rem; }
.mt-3  { margin-top: 1.5rem; }
.mt-4  { margin-top: 2rem; }
.mb-1  { margin-bottom: .5rem; }
.mb-2  { margin-bottom: 1rem; }
.mb-3  { margin-bottom: 1.5rem; }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }
.text-amber  { color: var(--amber); }
.text-green  { color: var(--green); }
.text-red    { color: var(--red); }
.font-display{ font-family: var(--font-display); }
.w-full { width: 100%; }

.spinner {
  width: 1.2rem; height: 1.2rem;
  border: 2px solid rgba(255,255,255,.15);
  border-top-color: var(--amber);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 1.5rem 0;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .navbar { padding: .75rem 1rem; }
  .card   { padding: 1.25rem; }
  .modal  { padding: 1.5rem; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}