:root {
  --ink: #17171f;
  --muted: #747487;
  --line: rgba(23, 23, 31, .11);
  --glass: rgba(255, 255, 255, .78);
  --paper: rgba(255, 255, 255, .94);
  --blue: #4b7dff;
  --violet: #8b5cf6;
  --pink: #ff6fb1;
  --orange: #ff7a1a;
  --amber: #ffc145;
  --cyan: #42d3ff;
  --right: #2563eb;
  --wrong: #e53e3e;
  --shadow: 0 24px 70px rgba(45, 37, 92, .16);
}

* { box-sizing: border-box; }
html { background: #fbfbff; }
body {
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% -8%, rgba(255, 111, 177, .28), transparent 32%),
    radial-gradient(circle at 85% 4%, rgba(66, 211, 255, .28), transparent 34%),
    radial-gradient(circle at 45% 42%, rgba(255, 193, 69, .18), transparent 28%),
    linear-gradient(180deg, #fbfbff 0%, #f6f3ff 48%, #fff8f1 100%);
}
button, input, select { font: inherit; }
button, .primary-link {
  align-items: center;
  background: linear-gradient(135deg, var(--orange), #ff9b2f);
  border: 0;
  border-radius: 18px;
  box-shadow: 0 14px 30px rgba(255, 122, 26, .24);
  color: #fff;
  cursor: pointer;
  display: inline-flex;
  font-weight: 900;
  justify-content: center;
  min-height: 52px;
  padding: 0 20px;
  text-decoration: none;
}
button:disabled { cursor: wait; opacity: .72; }
.otp-button {
  background: linear-gradient(135deg, #d9ffe7, #a6f5c8);
  box-shadow: 0 14px 30px rgba(74, 222, 128, .22);
  color: #123022;
}
.ghost, .icon-button {
  background: rgba(255,255,255,.76);
  border: 1px solid var(--line);
  box-shadow: none;
  color: var(--ink);
}
.app-shell {
  display: grid;
  gap: 14px;
  margin: 0 auto;
  max-width: 980px;
  min-height: 100vh;
  padding: max(16px, env(safe-area-inset-top)) 14px calc(74px + env(safe-area-inset-bottom));
}
.app-top {
  align-items: center;
  display: grid;
  gap: 10px;
  grid-template-columns: auto 1fr auto;
  padding: 4px 2px;
}
.quiz-mode .app-top,
.quiz-mode .quick-intro,
.quiz-mode .hero-card,
.quiz-mode .booster-banner {
  display: none;
}
.quiz-mode .app-shell {
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}
.app-top div { display: grid; gap: 2px; }
.app-top strong { font-size: clamp(20px, 5.2vw, 30px); letter-spacing: -.01em; }
.mini-label, .eyebrow {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.icon-button {
  border-radius: 16px;
  font-size: 20px;
  min-height: 44px;
  padding: 0;
  width: 44px;
}
.back-button {
  font-size: 34px;
  line-height: 1;
}
.back-button[hidden] {
  display: inline-flex;
  pointer-events: none;
  visibility: hidden;
}
.quick-intro {
  background: rgba(255,255,255,.72);
  border: 1px solid rgba(255,255,255,.8);
  border-radius: 22px;
  box-shadow: 0 12px 32px rgba(45, 37, 92, .08);
  display: grid;
  gap: 4px;
  padding: 13px 15px;
}
.quick-intro span {
  color: var(--violet);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.quick-intro p {
  color: var(--ink);
  font-size: 15px;
  font-weight: 750;
  line-height: 1.35;
  margin: 0;
}
.hero-card {
  background:
    linear-gradient(135deg, rgba(75, 125, 255, .96), rgba(139, 92, 246, .92) 48%, rgba(255, 111, 177, .9)),
    linear-gradient(45deg, transparent, rgba(255,255,255,.28));
  border: 1px solid rgba(255,255,255,.48);
  border-radius: 30px;
  box-shadow: var(--shadow);
  color: #fff;
  display: grid;
  gap: 18px;
  overflow: hidden;
  padding: 18px;
  position: relative;
}
.hero-card::after {
  content: "✦";
  font-size: 150px;
  opacity: .12;
  position: absolute;
  right: -18px;
  top: -46px;
}
.hero-copy, .player-hud { position: relative; z-index: 1; }
.pill {
  background: rgba(255,255,255,.22);
  border: 1px solid rgba(255,255,255,.34);
  border-radius: 999px;
  display: inline-flex;
  font-size: 13px;
  font-weight: 900;
  margin-bottom: 14px;
  padding: 8px 12px;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  font-size: clamp(30px, 9vw, 54px);
  letter-spacing: -.03em;
  line-height: .88;
  margin-bottom: 12px;
}
h2 {
  font-size: clamp(26px, 8vw, 44px);
  letter-spacing: -.025em;
  line-height: .98;
  margin-bottom: 0;
}
#welcomeTitle {
  font-size: clamp(20px, 5.6vw, 30px);
  line-height: 1.05;
}
h3 {
  font-size: clamp(24px, 7vw, 38px);
  letter-spacing: -.02em;
  line-height: 1.1;
  margin-bottom: 0;
}
.hero-copy p { color: rgba(255,255,255,.86); font-size: 17px; line-height: 1.5; margin-bottom: 0; }
.player-hud {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.leaderboard-card {
  background: rgba(255, 255, 255, .17);
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: 24px;
  display: grid;
  gap: 10px;
  padding: 14px;
  position: relative;
  z-index: 1;
}
.leaderboard-card > div {
  align-items: end;
  display: flex;
  gap: 10px;
  justify-content: space-between;
}
.leaderboard-card > div span {
  color: rgba(255, 255, 255, .82);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.leaderboard-card strong { font-size: 18px; }
.leaderboard-card ol {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.leaderboard-card li {
  align-items: center;
  background: rgba(255, 255, 255, .13);
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 16px;
  color: rgba(255, 255, 255, .9);
  display: flex;
  font-size: 14px;
  font-weight: 850;
  justify-content: space-between;
  min-height: 38px;
  padding: 8px 10px;
}
.leaderboard-card li.me {
  background: rgba(255, 255, 255, .28);
  color: #fff;
}
.leaderboard-card li strong { font-size: 14px; }
.player-hud div, .reward-grid div {
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 22px;
  display: grid;
  gap: 4px;
  min-height: 78px;
  padding: 12px;
}
.player-hud span, .reward-grid span { color: rgba(255,255,255,.78); font-size: 11px; font-weight: 900; text-transform: uppercase; }
.player-hud strong, .reward-grid strong { color: #fff; font-size: clamp(19px, 5vw, 28px); line-height: 1; }
.workspace { display: grid; gap: 14px; }
.panel {
  background: var(--paper);
  border: 1px solid rgba(255,255,255,.76);
  border-radius: 28px;
  box-shadow: var(--shadow);
  display: none;
  padding: 20px;
}
.panel.active { display: grid; gap: 16px; }
.panel-head {
  align-items: center;
  display: grid;
  gap: 12px;
  grid-template-columns: auto 1fr;
}
.split { grid-template-columns: 1fr auto; }
.section-icon {
  align-items: center;
  background: linear-gradient(135deg, #fff, #f2edff);
  border: 1px solid var(--line);
  border-radius: 18px;
  display: inline-flex;
  font-size: 24px;
  height: 54px;
  justify-content: center;
  width: 54px;
}
label {
  color: var(--muted);
  display: grid;
  font-size: 13px;
  font-weight: 850;
  gap: 7px;
}
input, select {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--ink);
  font-size: 17px;
  min-height: 62px;
  outline: none;
  padding: 0 14px;
  width: 100%;
}
input:focus, select:focus { border-color: var(--violet); box-shadow: 0 0 0 4px rgba(139, 92, 246, .14); }
.mode-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.mode-card {
  align-items: center;
  background: #fff;
  border: 1px solid rgba(139, 92, 246, .16);
  border-radius: 22px;
  box-shadow: 0 18px 36px rgba(45, 37, 92, .09);
  color: var(--ink);
  display: grid;
  gap: 3px 12px;
  grid-template-columns: auto 1fr auto;
  justify-content: start;
  min-height: 104px;
  overflow: hidden;
  padding: 15px 16px;
  position: relative;
  text-align: left;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.mode-card::after {
  align-items: center;
  background: rgba(255, 255, 255, .72);
  border: 1px solid rgba(23, 23, 31, .08);
  border-radius: 999px;
  color: var(--ink);
  content: "›";
  display: inline-flex;
  font-size: 28px;
  font-weight: 950;
  grid-column: 3;
  grid-row: 1 / 3;
  height: 38px;
  justify-content: center;
  width: 38px;
}
.mode-card:hover,
.mode-card:focus-visible {
  border-color: rgba(139, 92, 246, .38);
  box-shadow: 0 22px 42px rgba(45, 37, 92, .14);
  transform: translateY(-2px);
}
.mode-card span {
  font-size: 32px;
  grid-row: 1 / 3;
}
.mode-card strong { font-size: 22px; letter-spacing: -.02em; }
.mode-card small {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  grid-column: 2;
}
.mode-card.solo { background: linear-gradient(135deg, #ffffff, #eef5ff); }
.mode-card.create { background: linear-gradient(135deg, #ffffff, #fff0f8); }
.mode-card.join { background: linear-gradient(135deg, #ffffff, #fff7e1); }
.setup-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.availability, .result, .feedback {
  background: rgba(255,255,255,.62);
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
  min-height: 50px;
  padding: 13px 14px;
}
.room-card {
  background:
    linear-gradient(135deg, rgba(255,255,255,.92), rgba(245,241,255,.94)),
    radial-gradient(circle at 90% 10%, rgba(255, 193, 69, .26), transparent 30%);
}
.room-code {
  background: #17171f;
  border-radius: 24px;
  color: #fff;
  font-size: clamp(42px, 14vw, 70px);
  font-weight: 950;
  letter-spacing: .04em;
  padding: 18px;
  text-align: center;
}
#startBattleButton {
  background: linear-gradient(135deg, var(--blue), var(--violet));
  box-shadow: 0 14px 30px rgba(75, 125, 255, .24);
}
.quiz-panel {
  background: rgba(255,255,255,.96);
  gap: 10px;
  padding: 14px;
}
.practice-strip {
  align-items: center;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto auto;
}
.practice-strip div {
  background: linear-gradient(135deg, #f8faff, #fff7fb);
  border: 1px solid var(--line);
  border-radius: 16px;
  display: grid;
  gap: 1px;
  min-height: 48px;
  padding: 7px 9px;
}
.practice-strip span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 950;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.practice-strip strong {
  color: var(--ink);
  font-size: 19px;
  line-height: 1;
}
.sound-toggle,
.end-quiz {
  border-radius: 16px;
  min-height: 48px;
}
.sound-toggle {
  font-size: 18px;
  padding: 0;
  width: 48px;
}
.end-quiz {
  padding: 0 13px;
}
.quiz-progress {
  background: #eceaf5;
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
}
.quiz-progress span {
  background: linear-gradient(90deg, var(--cyan), var(--violet), var(--pink), var(--orange));
  display: block;
  height: 100%;
  transition: width .25s ease;
  width: 0%;
}
.quiz-top {
  align-items: start;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr auto;
}
.progress-pill {
  background: linear-gradient(135deg, #fff, #fff4d6);
  border: 1px solid rgba(255, 193, 69, .46);
  border-radius: 999px;
  color: #9a4b00;
  font-size: 19px;
  font-weight: 950;
  padding: 11px 16px;
}
.question-box {
  background: linear-gradient(135deg, #f8faff, #fff7fb);
  border: 1px solid var(--line);
  border-radius: 20px;
  display: grid;
  gap: 7px;
  padding: 13px;
}
.question-box p { color: var(--muted); font-size: 12px; font-weight: 850; margin: 0; }
.question-box h3 {
  font-size: clamp(19px, 5.2vw, 28px);
  line-height: 1.18;
}
.option-grid { display: grid; gap: 8px; }
.option-grid button {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 17px;
  box-shadow: 0 10px 24px rgba(45, 37, 92, .06);
  color: var(--ink);
  justify-content: flex-start;
  min-height: 50px;
  padding: 11px 13px;
  text-align: left;
}
.option-grid button:hover { border-color: var(--violet); transform: translateY(-1px); }
.option-grid button.selected {
  background: #f2edff;
  border-color: rgba(139, 92, 246, .56);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, .12);
}
.option-grid button.correct { background: #eef4ff; border-color: rgba(37,99,235,.34); color: var(--right); }
.option-grid button.wrong { background: #fff0f2; border-color: rgba(229,62,62,.32); color: var(--wrong); }
.quiz-panel #submitAnswer {
  align-self: center;
  border-radius: 16px;
  font-size: 15px;
  min-height: 42px;
  padding: 0 18px;
  width: min(100%, 220px);
}
.feedback.correct { background: #eef4ff; color: var(--right); }
.feedback.wrong { background: #fff0f2; color: var(--wrong); }
.reward-popups {
  display: grid;
  gap: 8px;
  left: 50%;
  pointer-events: none;
  position: fixed;
  top: max(14px, env(safe-area-inset-top));
  transform: translateX(-50%);
  width: min(92vw, 360px);
  z-index: 80;
}
.reward-popup {
  align-items: center;
  animation: rewardFloat 2.6s ease forwards;
  background: rgba(255, 255, 255, .92);
  border: 1px solid rgba(255, 255, 255, .84);
  border-radius: 22px;
  box-shadow: 0 20px 48px rgba(45, 37, 92, .22);
  display: grid;
  gap: 10px;
  grid-template-columns: auto 1fr;
  padding: 11px 13px;
}
.reward-popup span {
  align-items: center;
  border-radius: 18px;
  display: inline-flex;
  font-size: 28px;
  height: 46px;
  justify-content: center;
  width: 46px;
}
.reward-popup strong {
  color: var(--ink);
  display: block;
  font-size: 19px;
  line-height: 1.05;
}
.reward-popup small {
  color: var(--muted);
  display: block;
  font-size: 12px;
  font-weight: 850;
  margin-top: 2px;
}
.reward-popup.win span { background: #fff5d7; }
.reward-popup.combo span { background: #f2edff; }
.reward-popup.rank span { background: #e9f8ff; }
.reward-popup.level span { background: #fff0f8; }
.reward-popup.miss span { background: #f3f4f6; }

@keyframes rewardFloat {
  0% { opacity: 0; transform: translateY(-12px) scale(.96); }
  12% { opacity: 1; transform: translateY(0) scale(1); }
  78% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-8px) scale(.98); }
}
.reward-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.reward-grid div { background: linear-gradient(135deg, var(--blue), var(--violet)); }
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.booster-banner {
  align-items: center;
  background:
    radial-gradient(circle at 8% 0%, rgba(255, 193, 69, .32), transparent 30%),
    linear-gradient(135deg, #0d0d13, #1d1726 52%, #3b1c46);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 18px;
  bottom: max(8px, env(safe-area-inset-bottom));
  box-shadow: 0 18px 46px rgba(0, 0, 0, .28);
  color: #fff;
  display: flex;
  gap: 14px;
  justify-content: space-between;
  left: 12px;
  margin: 0 auto;
  max-width: 956px;
  min-height: 56px;
  padding: 8px 10px;
  position: fixed;
  right: 12px;
  text-decoration: none;
  z-index: 20;
}
.booster-banner span { color: #fff5d7; display: block; font-size: 12px; font-weight: 950; text-transform: uppercase; }
.booster-banner strong {
  display: block;
  font-size: clamp(15px, 4.1vw, 19px);
  line-height: 1.05;
  margin: 1px 0 0;
  max-width: min(58vw, 540px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.booster-banner small { display: none; }
.booster-banner em {
  align-self: center;
  animation: enrollPulse 1.6s ease-in-out infinite;
  background: linear-gradient(135deg, #fff, #ffe6a8);
  border-radius: 999px;
  color: #17171f;
  flex: 0 0 auto;
  font-size: 12px;
  font-style: normal;
  font-weight: 950;
  padding: 9px 12px;
  white-space: nowrap;
}

@keyframes enrollPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 rgba(255, 193, 69, 0); }
  50% { transform: scale(1.05); box-shadow: 0 0 22px rgba(255, 193, 69, .45); }
}

@media (max-width: 720px) {
  .app-shell { padding-left: 12px; padding-right: 12px; }
  .hero-card { border-radius: 24px; padding: 16px; }
  .player-hud { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panel { border-radius: 24px; padding: 18px; }
  .mode-grid, .setup-grid, .quiz-top, .reward-grid { grid-template-columns: 1fr; }
  .split { align-items: stretch; grid-template-columns: 1fr; }
  .mode-card { min-height: 88px; }
  .quiz-mode .app-shell { gap: 8px; padding-top: max(8px, env(safe-area-inset-top)); }
  .quiz-panel { border-radius: 20px; padding: 12px; }
  .practice-strip { gap: 6px; grid-template-columns: repeat(3, minmax(0, 1fr)) auto auto; }
  .practice-strip div { border-radius: 14px; min-height: 44px; padding: 6px 8px; }
  .practice-strip strong { font-size: 17px; }
  .sound-toggle { min-height: 44px; width: 42px; }
  .end-quiz { font-size: 13px; min-height: 44px; padding: 0 10px; }
  .quiz-panel #submitAnswer { min-height: 40px; width: min(100%, 190px); }
  .question-box { padding: 12px; }
  .option-grid button { min-height: 48px; }
  .booster-banner { border-radius: 17px; gap: 8px; }
  .booster-banner span { font-size: 10px; }
  .booster-banner strong { max-width: 55vw; }
  .booster-banner em { align-self: center; }
}