:root {
  --bg: #09090d;
  --panel: rgba(18, 18, 27, 0.92);
  --panel-strong: #14141f;
  --text: #ffffff;
  --muted: #b7b7c8;
  --red: #f00606;
  --red-dark: #9d0000;
  --line: rgba(255,255,255,0.12);
  --shadow: 0 24px 80px rgba(0,0,0,0.45);
  --good: #35d07f;
  --warn: #ffbf3f;
}

body.light {
  --bg: #f7f7fb;
  --panel: rgba(255,255,255,0.94);
  --panel-strong: #ffffff;
  --text: #101018;
  --muted: #55556a;
  --line: rgba(0,0,0,0.12);
  --shadow: 0 18px 70px rgba(18, 18, 35, 0.15);
}

* { box-sizing: border-box; }
html { min-height: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(240,6,6,0.22), transparent 38%), var(--bg);
  overflow-x: hidden;
}

.bg-glow { position: fixed; width: 340px; height: 340px; border-radius: 999px; filter: blur(80px); opacity: .45; z-index: -1; }
.glow-one { background: var(--red); top: 80px; left: -150px; }
.glow-two { background: #770000; bottom: 60px; right: -120px; }

.site-header, .site-footer {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-header { padding: 20px 0 12px; }
.site-footer { padding: 20px 0 30px; color: var(--muted); font-size: 14px; }
.site-footer a { color: var(--red); text-decoration: none; font-weight: 800; }
.brand-logo { width: min(260px, 58vw); height: auto; display: block; }
.top-actions { display: flex; align-items: center; gap: 10px; }
.home-link, .icon-btn, .secondary-link {
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 999px;
  padding: 10px 15px;
  font-weight: 800;
  box-shadow: 0 10px 30px rgba(0,0,0,0.18);
}
.icon-btn { cursor: pointer; min-width: 44px; }

.app-shell { width: min(1180px, calc(100% - 32px)); margin: 12px auto 0; }
.panel {
  display: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: clamp(18px, 4vw, 36px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.active-screen { display: block; animation: pop .35s ease both; }
@keyframes pop { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.hero-grid { display: grid; grid-template-columns: 1.5fr .8fr; gap: 24px; align-items: center; }
.eyebrow { margin: 0 0 8px; color: var(--red); text-transform: uppercase; letter-spacing: .12em; font-weight: 900; font-size: 13px; }
h1 { margin: 0; font-size: clamp(34px, 6vw, 68px); line-height: .98; letter-spacing: -0.05em; }
h2 { margin: 0; font-size: clamp(24px, 4vw, 38px); letter-spacing: -0.035em; }
.hero-copy { max-width: 650px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.feature-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.feature-row span {
  border: 1px solid rgba(240,6,6,.35);
  background: rgba(240,6,6,.12);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 999px;
  font-weight: 800;
}
.logo-card {
  background: linear-gradient(145deg, rgba(240,6,6,.22), rgba(255,255,255,.04));
  border: 1px solid rgba(240,6,6,.35);
  border-radius: 28px;
  padding: 26px;
  display: grid;
  place-items: center;
  text-align: center;
}
.logo-card img { width: min(210px, 50vw); filter: drop-shadow(0 20px 30px rgba(240,6,6,.25)); }
.logo-card strong { margin-top: 8px; font-size: 26px; }
.logo-card small { color: var(--muted); }

.class-card { margin-top: 28px; padding: 24px; background: var(--panel-strong); border: 1px solid var(--line); border-radius: 24px; }
.class-card p { color: var(--muted); margin: 8px 0 18px; }
.class-buttons { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.class-btn, .primary-btn, .secondary-btn, .ghost-btn {
  border: 0;
  border-radius: 18px;
  padding: 15px 18px;
  font-weight: 900;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.class-btn, .primary-btn { background: linear-gradient(135deg, var(--red), var(--red-dark)); color: white; box-shadow: 0 14px 30px rgba(240,6,6,.28); }
.secondary-btn { background: var(--text); color: var(--bg); }
.ghost-btn { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.class-btn:hover, .primary-btn:hover, .secondary-btn:hover, .ghost-btn:hover { transform: translateY(-2px); }

.game-topbar { display: flex; justify-content: space-between; gap: 20px; align-items: start; margin-bottom: 22px; }
.score-board { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
.score-board span { background: var(--panel-strong); border: 1px solid var(--line); border-radius: 999px; padding: 9px 12px; color: var(--muted); }
.score-board b { color: var(--text); }
.play-area { display: grid; grid-template-columns: minmax(280px, 1fr) 360px; gap: 22px; align-items: stretch; }
.clock-card, .question-card { background: var(--panel-strong); border: 1px solid var(--line); border-radius: 26px; padding: clamp(16px, 3vw, 24px); }
.clock-wrap { width: min(560px, 100%); margin: 0 auto; touch-action: none; }
#clockSvg { width: 100%; height: auto; display: block; }
.clock-outer { fill: rgba(240,6,6,.12); stroke: var(--red); stroke-width: 8; }
.clock-face { fill: var(--panel); stroke: var(--line); stroke-width: 2; }
.tick { stroke: var(--text); opacity: .42; stroke-linecap: round; }
.major-tick { stroke: var(--red); opacity: .9; stroke-width: 4; }
.clock-num { fill: var(--text); font-size: 24px; font-weight: 900; dominant-baseline: middle; text-anchor: middle; }
.hand { stroke-linecap: round; transform-origin: 180px 180px; transition: transform .16s ease; }
.hour-hand { stroke: var(--text); stroke-width: 12; }
.minute-hand { stroke: var(--red); stroke-width: 8; }
.pin { fill: var(--red); stroke: white; stroke-width: 3; }
.clock-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.control-group { background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: 18px; padding: 14px; display: grid; gap: 8px; }
.control-group label { color: var(--muted); font-weight: 800; }
.control-group span { font-size: 24px; font-weight: 950; color: var(--red); }
input[type="range"] { width: 100%; accent-color: var(--red); }
.question-card { display: flex; flex-direction: column; gap: 14px; }
.digital-target, .answer-preview { border-radius: 22px; padding: 18px; background: linear-gradient(145deg, rgba(240,6,6,.16), rgba(255,255,255,.04)); border: 1px solid rgba(240,6,6,.24); }
.digital-target small, .answer-preview small { color: var(--muted); display: block; margin-bottom: 4px; font-weight: 800; }
.digital-target strong, .answer-preview strong { font-size: clamp(34px, 6vw, 56px); letter-spacing: .02em; }
.digital-target em { display: block; margin-top: 8px; color: var(--text); font-style: normal; font-size: clamp(20px, 3vw, 30px); font-weight: 950; line-height: 1.15; }
#instructionText { color: var(--muted); line-height: 1.6; margin: 0; }
.feedback { min-height: 54px; display: flex; align-items: center; border: 1px dashed var(--line); border-radius: 18px; padding: 12px; color: var(--muted); font-weight: 800; }
.feedback.correct { color: var(--good); border-color: rgba(53,208,127,.45); }
.feedback.wrong { color: var(--warn); border-color: rgba(255,191,63,.45); }
.hidden { display: none !important; }
.result-panel { text-align: center; max-width: 760px; margin: 0 auto; }
.result-panel img { width: 130px; }
.result-panel p { color: var(--muted); font-size: 18px; }
.result-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 20px; }

@media (max-width: 880px) {
  .hero-grid, .play-area { grid-template-columns: 1fr; }
  .game-topbar { flex-direction: column; }
  .score-board { justify-content: flex-start; }
  .class-buttons { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 560px) {
  .site-header { flex-direction: column; align-items: stretch; }
  .top-actions { justify-content: space-between; }
  .home-link { font-size: 13px; }
  .class-buttons { grid-template-columns: repeat(2, 1fr); }
  .clock-controls { grid-template-columns: 1fr; }
  .panel { border-radius: 22px; }
}