/* ===== 书下曲大擂台 · PJSK 风 ===== */
:root {
  --bg1: #0b1030;
  --bg2: #1a1040;
  --accent: #ff5eb0;
  --accent2: #7ec8ff;
  --text: #f4f6ff;
  --text-dim: #a8b0d0;
  --card-bg: rgba(255,255,255,0.06);
  --card-border: rgba(255,255,255,0.14);
}

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

html, body { height: 100%; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  background: linear-gradient(160deg, var(--bg1) 0%, var(--bg2) 60%, #2a1050 100%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  justify-content: center;
}

/* 星空背景 */
.stars {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.7), transparent),
    radial-gradient(1px 1px at 70% 20%, rgba(255,255,255,.5), transparent),
    radial-gradient(1.5px 1.5px at 40% 70%, rgba(126,200,255,.6), transparent),
    radial-gradient(1px 1px at 85% 60%, rgba(255,255,255,.5), transparent),
    radial-gradient(1.5px 1.5px at 10% 80%, rgba(255,94,176,.5), transparent),
    radial-gradient(1px 1px at 55% 45%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 90% 85%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 30% 55%, rgba(255,255,255,.35), transparent);
  animation: twinkle 4s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: .5; } to { opacity: 1; } }

.view { display: none; width: 100%; max-width: 1080px; min-height: 100vh; padding: 24px 20px 60px; position: relative; z-index: 1; }
.view.active { display: flex; flex-direction: column; align-items: center; }

/* ===== 首页 ===== */
.hero { text-align: center; margin: 9vh 0 4vh; }
.hero-badge {
  display: inline-block; font-size: 12px; letter-spacing: .35em; color: var(--accent2);
  border: 1px solid rgba(126,200,255,.4); border-radius: 999px; padding: 6px 18px; margin-bottom: 22px;
}
.hero-title { font-size: clamp(44px, 8vw, 76px); font-weight: 900; letter-spacing: .06em; line-height: 1.2; }
.hero-title span {
  background: linear-gradient(90deg, var(--accent), #ffb45e, var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { margin-top: 18px; color: var(--text-dim); font-size: 16px; line-height: 1.8; }

.mode-cards { display: flex; gap: 22px; flex-wrap: wrap; justify-content: center; margin-top: 26px; }
.mode-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 18px;
  padding: 28px 34px; width: 250px; cursor: pointer; text-align: center; color: var(--text);
  transition: transform .25s, box-shadow .25s, border-color .25s; backdrop-filter: blur(6px);
}
.mode-card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: 0 12px 40px rgba(255,94,176,.25); }
.mode-icon { font-size: 42px; margin-bottom: 14px; }
.mode-name { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.mode-desc { font-size: 13px; color: var(--text-dim); line-height: 1.7; }

/* 团体选择 */
.unit-picker { margin-top: 44px; width: 100%; max-width: 640px; text-align: center; animation: fadeUp .4s ease; }
.picker-title { font-size: 20px; font-weight: 700; margin-bottom: 20px; color: var(--accent2); letter-spacing: .2em; }
.unit-grid { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.unit-btn {
  --uc: #fff;
  background: color-mix(in srgb, var(--uc) 18%, transparent);
  border: 2px solid color-mix(in srgb, var(--uc) 55%, transparent);
  color: var(--text); border-radius: 14px; padding: 18px 14px; min-width: 110px; flex: 1;
  font-size: 14px; font-weight: 700; line-height: 1.5; cursor: pointer;
  transition: transform .2s, box-shadow .2s;
}
.unit-btn:hover { transform: translateY(-4px) scale(1.03); box-shadow: 0 8px 30px color-mix(in srgb, var(--uc) 40%, transparent); }

.foot-note { margin-top: auto; padding-top: 48px; font-size: 11px; color: rgba(168,176,208,.5); text-align: center; }

/* ===== 对战页 ===== */
.battle-header { width: 100%; max-width: 900px; text-align: center; margin-bottom: 26px; }
.battle-meta { display: flex; gap: 10px; justify-content: center; margin-bottom: 14px; }
.badge {
  font-size: 12px; padding: 5px 14px; border-radius: 999px;
  background: rgba(126,200,255,.12); border: 1px solid rgba(126,200,255,.3); color: var(--accent2);
}
.progress-badge { background: rgba(255,94,176,.12); border-color: rgba(255,94,176,.3); color: var(--accent); }
.round-title { font-size: 30px; font-weight: 900; letter-spacing: .1em; margin-bottom: 18px; }
.round-title span { color: var(--accent); }
.progress-track { width: 100%; height: 6px; background: rgba(255,255,255,.08); border-radius: 99px; overflow: hidden; }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 99px; transition: width .4s ease; }

.versus-area { display: flex; align-items: center; justify-content: center; gap: 18px; width: 100%; max-width: 880px; flex-wrap: wrap; }

.song-card {
  flex: 1 1 260px; max-width: 320px; background: var(--card-bg); border: 1.5px solid var(--card-border);
  border-radius: 18px; overflow: hidden; cursor: pointer; position: relative;
  transition: transform .25s, box-shadow .25s, border-color .25s, opacity .3s;
  animation: fadeUp .45s ease both;
}
.song-card:hover { transform: translateY(-8px) scale(1.02); border-color: var(--accent); box-shadow: 0 16px 50px rgba(255,94,176,.3); }
.song-card.picked { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent), 0 16px 60px rgba(255,94,176,.45); transform: scale(1.03); }
.song-card.losing { opacity: .25; transform: scale(.94); }

.card-jacket-wrap { width: 100%; background: #141a38; position: relative; overflow: hidden; }
.card-jacket { width: 100%; height: auto; aspect-ratio: 1; object-fit: cover; display: block; transition: transform .5s ease; }
.song-card:hover .card-jacket { transform: scale(1.06); }
.jacket-fallback { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: 64px; color: var(--text-dim); }

/* 曲绘上叠加歌名 */
.card-overlay {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 34px 14px 12px; text-align: left;
  background: linear-gradient(180deg, transparent 0%, rgba(5,8,25,.55) 55%, rgba(5,8,25,.88) 100%);
  pointer-events: none;
}
.ov-title { font-size: 17px; font-weight: 800; line-height: 1.3; text-shadow: 0 1px 6px rgba(0,0,0,.8); }
.ov-title-zh { font-size: 12px; color: rgba(244,246,255,.85); margin-top: 2px; text-shadow: 0 1px 4px rgba(0,0,0,.8); }

.card-info { padding: 12px 14px 16px; text-align: center; }
.card-unit {
  display: inline-block; font-size: 11px; padding: 3px 12px; border-radius: 999px; margin-bottom: 10px;
  background: rgba(126,200,255,.15); color: var(--accent2); letter-spacing: .05em;
}
.card-title { font-size: 21px; font-weight: 800; margin-bottom: 4px; }
.card-title-zh { font-size: 14px; color: var(--text-dim); margin-bottom: 12px; }
.card-composer { font-size: 12px; color: var(--text-dim); }
.card-event { margin-top: 8px; font-size: 11px; color: rgba(255,180,94,.85); }

.vs-badge {
  font-size: 30px; font-weight: 900; font-style: italic; letter-spacing: .05em; flex: 0 0 auto;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 30px rgba(255,94,176,.35);
  animation: pulse 1.6s ease infinite;
}
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.12); } }

.battle-footer { display: flex; align-items: center; gap: 20px; margin-top: 30px; }
.hint { color: var(--text-dim); font-size: 14px; }

.btn-ghost {
  background: transparent; border: 1.5px solid var(--card-border); color: var(--text-dim);
  padding: 10px 22px; border-radius: 999px; font-size: 14px; cursor: pointer; transition: all .2s;
}
.btn-ghost:hover { border-color: var(--text); color: var(--text); }

/* ===== 轮次结算 ===== */
.round-end-box { text-align: center; margin-top: 8vh; width: 100%; max-width: 640px; }
.round-end-title { font-size: 40px; font-weight: 900; }
.round-end-title span { color: var(--accent); }
.round-end-sub { margin: 14px 0 30px; color: var(--text-dim); font-size: 15px; }
.advance-list { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 36px; }
.advance-chip {
  display: flex; align-items: center; gap: 10px; background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: 12px; padding: 8px 14px; font-size: 13px; animation: fadeUp .4s ease both;
}
.advance-chip img { width: 44px; height: 44px; border-radius: 8px; object-fit: cover; }
.advance-chip .ac-name { font-weight: 700; }
.advance-chip .ac-unit { font-size: 11px; color: var(--text-dim); }

.btn-primary {
  background: linear-gradient(90deg, var(--accent), #ff7ab8); border: none; color: #fff;
  padding: 14px 40px; border-radius: 999px; font-size: 16px; font-weight: 700; cursor: pointer;
  transition: transform .2s, box-shadow .2s; box-shadow: 0 8px 30px rgba(255,94,176,.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(255,94,176,.5); }

/* ===== 冠军页 ===== */
.champion-box { text-align: center; margin-top: 6vh; animation: championIn 1s ease both; }
.crown { font-size: 72px; animation: crownFloat 2.2s ease infinite; }
@keyframes crownFloat { 0%,100% { transform: translateY(0) rotate(-4deg); } 50% { transform: translateY(-12px) rotate(4deg); } }
.champion-label {
  display: inline-block; margin: 12px 0 22px; font-size: 14px; letter-spacing: .4em; color: #ffd76e;
  border: 1px solid rgba(255,215,110,.5); border-radius: 999px; padding: 8px 24px;
  background: rgba(255,215,110,.08);
}
.champion-jacket-wrap {
  position: relative; display: inline-block; border-radius: 24px; overflow: hidden;
  border: 3px solid rgba(255,215,110,.6); box-shadow: 0 0 60px rgba(255,215,110,.35), 0 20px 60px rgba(0,0,0,.5);
  animation: championIn 1.2s ease both;
}
.champion-jacket {
  width: min(300px, 66vw); aspect-ratio: 1; object-fit: cover; display: block;
}
.champion-overlay { text-align: center; }
.champion-ov-title { font-size: 26px; }
.champion-title-zh { font-size: 15px; color: rgba(244,246,255,.9); margin-top: 3px; text-shadow: 0 1px 4px rgba(0,0,0,.8); }
.champion-meta { margin-top: 14px; font-size: 14px; color: var(--accent2); }
.champion-event { margin-top: 8px; font-size: 13px; color: rgba(255,180,94,.9); }
.champion-actions { display: flex; gap: 16px; justify-content: center; margin-top: 36px; }

/* 撒花动画 */
@keyframes confetti { 0% { transform: translateY(-10vh) rotate(0); opacity: 1; } 100% { transform: translateY(110vh) rotate(720deg); opacity: 0; } }
.confetti-piece { position: fixed; top: 0; width: 10px; height: 16px; border-radius: 2px; pointer-events: none; z-index: 5; animation: confetti linear forwards; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes championIn { from { opacity: 0; transform: scale(.7); } to { opacity: 1; transform: scale(1); } }

/* 手机适配 */
@media (max-width: 720px) {
  .versus-area { flex-direction: column; }
  .vs-badge { transform: rotate(90deg); margin: -6px 0; }
  .song-card { max-width: 420px; width: 100%; flex: 0 0 auto; }
  .mode-cards { flex-direction: column; align-items: center; }
  .mode-card { width: min(320px, 90vw); }
  .hero { margin-top: 6vh; }
}