:root {
  --accent: #5ba8a0;
  --accent-light: rgba(91,168,160,0.10);
  --bg: #f9f7f4;
  --white: #fff;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --border: rgba(91,168,160,0.22);
  --radius: 10px;
  --correct: #27ae60;
  --incorrect: #c0392b;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-heading: 'Cormorant Garamond', Georgia, serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ===== HEADER ===== */
.qz-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 52px;
}

.qz-back, .qz-header-btn {
  font-size: .82rem;
  color: var(--text-muted);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  padding: 0;
  transition: color .2s;
}

.qz-back:hover, .qz-header-btn:hover { color: var(--accent); }

.qz-header-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: .01em;
}

/* ===== MAIN ===== */
.qz-main {
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ===== SCREENS ===== */
.qz-screen { display: none; }

.qz-screen.active {
  display: block;
  animation: qzIn .3s ease;
}

@keyframes qzIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== CARD ===== */
.qz-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.25rem 2rem;
  margin-bottom: 1.5rem;
}

.qz-accent-line {
  width: 40px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 1.5rem;
}

/* ===== INTRO CARD ===== */
.qz-intro-card { text-align: left; }

.qz-page-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 300;
  line-height: 1.2;
  margin-bottom: .65rem;
  color: var(--text);
}

.qz-page-desc {
  font-size: .9rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

/* ===== BUTTONS ===== */
.qz-btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: .7rem 2rem;
  font-size: .9rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: opacity .2s;
  display: inline-block;
}

.qz-btn-primary:hover   { opacity: .88; }
.qz-btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.qz-btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .7rem 1.5rem;
  font-size: .9rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color .2s, color .2s;
  display: inline-block;
}

.qz-btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== LEADERBOARD ===== */
.qz-section-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 300;
  margin-bottom: 1.1rem;
  color: var(--text);
}

.qz-empty {
  font-size: .85rem;
  color: var(--text-muted);
  text-align: center;
  padding: 2rem 0;
}

.qz-board-table {
  width: 100%;
  border-collapse: collapse;
}

.qz-board-table th {
  text-align: left;
  font-size: .72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: .45rem .75rem;
  border-bottom: 1px solid var(--border);
}

.qz-board-table td {
  padding: .65rem .75rem;
  font-size: .88rem;
  border-bottom: 1px solid rgba(0,0,0,.04);
}

.qz-board-table tr:last-child td { border-bottom: none; }

.qz-board-rank        { font-weight: 600; color: var(--accent); width: 42px; font-size: 1rem; }
.qz-board-rank.gold   { color: #d4a017; }
.qz-board-rank.silver { color: #8e8e93; }
.qz-board-rank.bronze { color: #a0522d; }
.qz-board-name        { font-weight: 500; }
.qz-board-pct         { font-weight: 600; color: var(--accent); }
.qz-board-time, .qz-board-date { font-size: .78rem; color: var(--text-muted); text-align: right; }

/* ===== NAME SCREEN ===== */
.qz-name-card { text-align: center; }
.qz-name-card .qz-accent-line { margin: 0 auto 1.5rem; }

.qz-name-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 300;
  margin-bottom: .5rem;
}

.qz-name-desc {
  font-size: .88rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.qz-name-input {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 0 auto .75rem;
  padding: .8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-body);
  outline: none;
  text-align: center;
  transition: border-color .2s;
  background: var(--white);
}

.qz-name-input:focus { border-color: var(--accent); }

.qz-error { font-size: .82rem; color: var(--incorrect); margin-bottom: .75rem; }
.qz-error.hidden { display: none; }

.qz-name-btns {
  display: flex;
  gap: .75rem;
  justify-content: center;
  margin-top: 1rem;
}

/* ===== QUIZ HEADER ===== */
.qz-quiz-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.qz-progress-text {
  font-size: .8rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.qz-timer-bar-wrap {
  flex: 1;
  height: 4px;
  background: rgba(0,0,0,.08);
  border-radius: 4px;
  overflow: hidden;
}

.qz-timer-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  width: 100%;
  transition: background .4s;
}

.qz-timer-bar.danger { background: #e74c3c; }

.qz-timer-text {
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  width: 22px;
  text-align: right;
}

/* ===== QUESTION CARD ===== */
.qz-question-card { padding: 2rem; }

.qz-question-text {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 300;
  line-height: 1.4;
  margin-bottom: 1.75rem;
  color: var(--text);
}

/* ===== OPTIONS ===== */
.qz-options { display: flex; flex-direction: column; gap: .55rem; }

.qz-option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .9rem 1.2rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .1s;
  text-align: left;
  font-family: var(--font-body);
  font-size: .9rem;
  color: var(--text);
  width: 100%;
}

.qz-option:hover:not([disabled]) {
  border-color: var(--accent);
  background: var(--accent-light);
}

.qz-option:active:not([disabled]) { transform: scale(.99); }
.qz-option[disabled] { cursor: default; }

.qz-option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .72rem;
  font-weight: 600;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: background .15s, border-color .15s, color .15s;
}

.qz-option-text { flex: 1; line-height: 1.4; }

.qz-option.selected { border-color: var(--accent); background: var(--accent-light); }
.qz-option.selected .qz-option-letter { background: var(--accent); border-color: var(--accent); color: #fff; }

.qz-option.correct { border-color: var(--correct); background: rgba(39,174,96,.08); }
.qz-option.correct .qz-option-letter { background: var(--correct); border-color: var(--correct); color: #fff; }

.qz-option.incorrect { border-color: var(--incorrect); background: rgba(192,57,43,.07); }
.qz-option.incorrect .qz-option-letter { background: var(--incorrect); border-color: var(--incorrect); color: #fff; }

/* ===== RESULT SCREEN ===== */
.qz-result-card { text-align: center; }
.qz-result-card .qz-accent-line { margin: 0 auto 2rem; }

.qz-score-display {
  display: inline-flex;
  align-items: baseline;
  gap: .15rem;
  margin-bottom: 1.25rem;
  font-family: var(--font-heading);
}

.qz-score-num   { font-size: 4.5rem; font-weight: 300; color: var(--accent); line-height: 1; }
.qz-score-sep   { font-size: 2.2rem; color: var(--text-muted); font-weight: 300; }
.qz-score-total { font-size: 2.2rem; color: var(--text-muted); font-weight: 300; }

.qz-result-title {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  font-weight: 300;
  margin-bottom: .5rem;
}

.qz-result-msg  { font-size: .9rem; color: var(--text-muted); margin-bottom: .75rem; }
.qz-result-rank { font-size: .85rem; font-weight: 600; color: var(--accent); margin-bottom: 1.75rem; }

.qz-result-btns {
  display: flex;
  gap: .75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .qz-main { padding: 1.25rem 1rem 3rem; }
  .qz-card { padding: 1.5rem 1.25rem; }
  .qz-page-title { font-size: 1.7rem; }
  .qz-question-text { font-size: 1.3rem; }
  .qz-score-num { font-size: 3.5rem; }
  .qz-board-time, .qz-board-date { display: none; }
}