:root {
  --bg: #0b0b0f;
  --panel: #15151c;
  --panel-2: #1e1e28;
  --border: #2a2a37;
  --text: #f4f4f7;
  --muted: #9a9aab;
  --accent: #ff2e63;
  --accent-2: #08d9d6;
  --grad: linear-gradient(120deg, #ff2e63, #ff7a45 55%, #08d9d6);
  --radius: 16px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ---------- header ---------- */
header.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 22px; position: sticky; top: 0; z-index: 20;
  background: linear-gradient(180deg, var(--bg) 60%, transparent);
}
.brand { font-weight: 800; letter-spacing: 3px; font-size: 15px; cursor: pointer; }
.brand span { color: var(--accent); }
.top-links a { color: var(--muted); text-decoration: none; font-size: 13px; margin-left: 18px; }
.top-links a:hover { color: var(--text); }

#stage { max-width: 720px; margin: 0 auto; padding: 0 20px 60px; }

.screen { display: none; animation: rise .35s ease; }
.screen.active { display: block; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* ---------- hero ---------- */
.hero { position: relative; text-align: center; padding: 9vh 10px 40px; }
.hero-glow {
  position: absolute; inset: -40px -60px auto; height: 340px; pointer-events: none;
  background:
    radial-gradient(340px 220px at 28% 30%, rgba(255,46,99,.28), transparent 70%),
    radial-gradient(300px 200px at 72% 55%, rgba(8,217,214,.22), transparent 70%);
  filter: blur(6px);
}
.hero-kicker { position: relative; font-size: 11px; letter-spacing: 4px; color: var(--muted); margin-bottom: 18px; }
.hero-title {
  position: relative; font-size: clamp(38px, 9vw, 58px); line-height: 1.15;
  margin: 0 0 18px; font-weight: 800; letter-spacing: 1px;
}
.hero-title em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { position: relative; color: var(--muted); font-size: 15px; margin: 0 0 38px; }
.cta {
  position: relative;
  background: var(--grad); color: #fff; border: none; cursor: pointer;
  font-size: 18px; font-weight: 700; letter-spacing: 1px;
  padding: 17px 46px; border-radius: 999px;
  box-shadow: 0 10px 34px rgba(255, 46, 99, .35);
  transition: transform .15s ease;
}
.cta:active { transform: scale(.97); }
.player-badge { position: relative; margin-top: 22px; font-size: 13px; color: var(--muted); }
.player-badge b { color: var(--text); font-weight: 600; }
.player-badge a { color: var(--accent-2); text-decoration: none; margin-left: 8px; }

/* ---------- step pages ---------- */
.step-head { text-align: center; margin: 4vh 0 26px; }
.step-head h2 { font-size: clamp(21px, 5.4vw, 27px); margin: 0 0 8px; font-weight: 800; }
.step-head .muted { margin: 0; }

.dots { display: flex; justify-content: center; gap: 7px; margin-top: 3vh; }
.dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--panel-2); border: 1px solid var(--border); }
.dots i.done { background: var(--accent); border-color: var(--accent); }
.dots i.cur { background: var(--accent-2); border-color: var(--accent-2); transform: scale(1.25); }

/* platform cards */
.plat-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 520px; margin: 0 auto; }
.plat-card {
  background: var(--panel); border: 1.5px solid var(--border); border-radius: 20px;
  padding: 34px 10px; cursor: pointer; color: var(--text);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  font-size: 16px; font-weight: 700; transition: .15s;
}
.plat-card .plat-ico { font-size: 40px; }
.plat-card:hover, .plat-card:active { border-color: var(--accent); transform: translateY(-2px); }

/* A/B question cards */
.ab-cards { display: grid; gap: 14px; max-width: 540px; margin: 0 auto; }
.ab-card {
  display: flex; align-items: center; gap: 14px; text-align: left;
  background: var(--panel); border: 1.5px solid var(--border); border-radius: var(--radius);
  color: var(--text); padding: 20px 18px; font-size: 16px; font-weight: 600;
  cursor: pointer; transition: .15s;
}
.ab-card .emoji { font-size: 26px; flex-shrink: 0; }
.ab-card .ab-label { flex: 1; }
.ab-card .ab-go { color: var(--accent); font-size: 13px; font-weight: 700; flex-shrink: 0; }
.ab-card:hover, .ab-card:active { border-color: var(--accent); background: #1c1c26; transform: translateY(-2px); }
.ab-listen {
  flex-shrink: 0; width: 40px; height: 40px; border-radius: 50%;
  border: 1.5px solid var(--accent-2); background: rgba(8,217,214,.08); color: var(--accent-2);
  font-size: 16px; cursor: pointer; transition: .15s;
}
.ab-listen.playing { background: var(--accent-2); color: #001; }

/* clip actions */
.clip-actions { display: flex; justify-content: center; gap: 12px; margin-top: 22px; flex-wrap: wrap; }
.pill-btn {
  background: rgba(255,46,99,.12); border: 1.5px solid var(--accent); color: var(--accent);
  border-radius: 999px; padding: 11px 22px; font-size: 14px; font-weight: 700; cursor: pointer; transition: .15s;
}
.pill-btn:hover, .pill-btn:active { background: var(--accent); color: #fff; }
.pill-btn.ghost { background: none; border-color: var(--border); color: var(--muted); }
.pill-btn.ghost:hover { border-color: var(--text); color: var(--text); background: none; }

/* clip battle */
.clip-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 560px; margin: 0 auto; }
.clip-card {
  background: var(--panel); border: 1.5px solid var(--border); border-radius: 20px;
  padding: 22px 14px 18px; text-align: center; transition: .15s;
}
.clip-card.playing-card { border-color: var(--accent-2); }
.clip-play {
  width: 74px; height: 74px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--panel-2); color: var(--text); font-size: 26px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--border); transition: .15s; margin-bottom: 14px;
}
.clip-play.playing { background: var(--grad); border-color: transparent; color: #fff; box-shadow: 0 8px 24px rgba(255,46,99,.35); }
.clip-label { font-size: 12px; color: var(--muted); letter-spacing: 2px; margin-bottom: 6px; }
.clip-title {
  font-size: 14px; font-weight: 700; min-height: 38px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.clip-artist { color: var(--muted); font-size: 12px; margin: 2px 0 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.clip-pick {
  background: none; border: 1.5px solid var(--accent); color: var(--accent);
  border-radius: 999px; padding: 9px 22px; font-size: 14px; font-weight: 700; cursor: pointer; transition: .15s;
}
.clip-pick:hover, .clip-pick:active { background: var(--accent); color: #fff; }

.center { text-align: center; margin-top: 22px; }
.link-btn { background: none; border: none; color: var(--muted); font-size: 13px; cursor: pointer; text-decoration: underline; }

/* loading */
.loading-box { text-align: center; padding: 18vh 0; }
.loading-disc { font-size: 64px; animation: spin 1.6s linear infinite; display: inline-block; }
.loading-text { color: var(--muted); margin-top: 18px; font-size: 15px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* result */
.result-head { text-align: center; margin: 3vh 0 20px; }
.result-head h2 { font-size: clamp(24px, 6vw, 32px); margin: 6px 0; font-weight: 800; }
.result-row {
  display: flex; align-items: center; gap: 12px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 12px 14px; margin: 8px 0;
}
.result-row .num { color: var(--muted); font-size: 12px; width: 20px; text-align: right; }
.result-row .meta { flex: 1; min-width: 0; }
.result-row .title { font-weight: 700; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-row .artist { color: var(--muted); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.open-btn {
  text-decoration: none; font-size: 13px; font-weight: 700; white-space: nowrap;
  padding: 8px 14px; border-radius: 999px; border: 1.5px solid var(--accent-2); color: var(--accent-2);
  transition: .15s;
}
.open-btn:active { background: var(--accent-2); color: #000; }

/* shared bits */
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.btn { background: var(--accent); color: #fff; border: none; border-radius: 10px; padding: 11px 16px; font-size: 14px; font-weight: 600; cursor: pointer; }
.btn.ghost { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.btn.small { padding: 7px 12px; font-size: 12.5px; border-radius: 9px; }
.btn:disabled { opacity: .5; cursor: default; }
textarea, input[type=text], input[type=number] {
  width: 100%; background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); padding: 10px 12px; font-size: 14px; font-family: inherit;
}
textarea { min-height: 110px; resize: vertical; }
.row { display: flex; gap: 8px; align-items: center; }
.row.center { justify-content: center; }
.row.tight { gap: 6px; }
.grow { flex: 1; }
.muted { color: var(--muted); font-size: 13px; }
.pill { font-size: 11px; padding: 2px 8px; border-radius: 10px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); }
.pill.bpm { color: var(--accent-2); font-weight: 700; }

.iconbtn {
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text);
  width: 38px; height: 38px; border-radius: 10px; font-size: 15px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.iconbtn.playing { background: var(--accent); border-color: var(--accent); color: #fff; }

.song { display: flex; align-items: center; gap: 12px; padding: 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; margin: 8px 0; }
.song .meta { flex: 1; min-width: 0; }
.song .title { font-weight: 600; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.song .artist { color: var(--muted); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { background: var(--panel-2); border: 1px solid var(--border); color: var(--text); padding: 6px 11px; border-radius: 20px; font-size: 12.5px; cursor: pointer; }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip .n { color: var(--muted); font-size: 11px; margin-left: 4px; }
.chip.active .n { color: rgba(255,255,255,.85); }

.progress { height: 8px; background: var(--panel-2); border-radius: 6px; overflow: hidden; margin: 10px 0 6px; }
.progress > i { display: block; height: 100%; background: var(--grad); width: 0; transition: width .3s; }

.empty { text-align: center; color: var(--muted); padding: 40px 20px; }

/* 题库维护 */
.bank-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 12px; margin: 8px 0; }
.bank-card.off { opacity: .5; }
.bank-text { font-weight: 600; margin-bottom: 8px; }
.bank-opts { display: grid; gap: 6px; }
.bank-opt { display: flex; gap: 6px; }
.bank-opt .be { width: 46px; text-align: center; padding: 8px 4px; }
.bank-opt .bl { flex: 1; }
.bank-opt .bc { width: 68px; }
.bank-actions { display: flex; align-items: center; gap: 12px; margin-top: 10px; flex-wrap: wrap; }
.tgl { font-size: 12.5px; color: var(--muted); display: flex; align-items: center; gap: 4px; cursor: pointer; }
.iconbtn.tiny { width: 30px; height: 30px; font-size: 13px; }
.bank-actions .b-save { margin-left: auto; }

/* result save area */
#result-save { margin-top: 18px; }
.save-cta {
  display: inline-block; text-decoration: none; border: none; cursor: pointer;
  background: var(--grad); color: #fff; font-size: 16px; font-weight: 700;
  padding: 14px 30px; border-radius: 999px; box-shadow: 0 8px 26px rgba(255,46,99,.3);
}
.save-done-title { font-weight: 700; margin-bottom: 12px; }
.spin-inline { display: inline-block; animation: spin 1.4s linear infinite; }

/* QR modal */
#toast {
  position: fixed; bottom: 40px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #000; border: 1px solid var(--border); color: #fff;
  padding: 10px 18px; border-radius: 24px; font-size: 13px;
  opacity: 0; pointer-events: none; transition: .25s; z-index: 50; max-width: 90vw; text-align: center;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 480px) {
  .plat-cards { grid-template-columns: 1fr; }
}

/* 舞种选择(阶段三) */
.style-cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px; max-width: 540px; margin: 0 auto 26px;
}
.style-card {
  background: var(--panel); border: 1.5px solid var(--border); border-radius: 16px;
  padding: 18px 12px; cursor: pointer; color: var(--text);
  display: flex; flex-direction: column; align-items: center; gap: 5px; transition: .15s;
}
.style-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.style-card.on { border-color: var(--accent); background: rgba(255,46,99,.14); }
.style-card.on .style-name::before { content: "✓ "; color: var(--accent); }
.style-name { font-size: 15px; font-weight: 700; }
.style-count { font-size: 11.5px; color: var(--muted); }
.style-card.thin .style-count { color: #c9a227; }

/* 图片题 / 多选题(阶段五) */
.ab-card.pic { flex-direction: column; align-items: stretch; padding: 0; overflow: hidden; gap: 0; }
.ab-pic { width: 100%; height: 168px; object-fit: cover; display: block; background: var(--panel-2); }
.ab-pic-body { display: flex; align-items: center; gap: 12px; padding: 14px 16px; }

.multi-hint { text-align: center; font-size: 12.5px; color: var(--muted); margin-bottom: 14px; }
.multi-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px; max-width: 560px; margin: 0 auto;
}
.multi-card {
  background: var(--panel); border: 1.5px solid var(--border); border-radius: 14px;
  color: var(--text); cursor: pointer; padding: 16px 10px; transition: .15s;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.multi-card.pic { padding: 0; overflow: hidden; }
.multi-pic { width: 100%; height: 116px; object-fit: cover; display: block; background: var(--panel-2); }
.multi-card.pic .multi-label { padding: 0 8px 12px; }
.multi-emoji { font-size: 26px; }
.multi-label { font-size: 14px; font-weight: 600; text-align: center; }
.multi-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.multi-card.on { border-color: var(--accent); background: rgba(255,46,99,.14); }
.multi-card.on .multi-label::before { content: "✓ "; color: var(--accent); }
.multi-go { margin-top: 22px; }

/* 曲库页的标签 chip */
.song .tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 5px; }
.tg {
  font-size: 10.5px; padding: 1px 6px; border-radius: 5px;
  background: rgba(255,255,255,.07); color: var(--muted); white-space: nowrap;
}
.tg.st { background: rgba(255,46,99,.16); color: #ff8fa8; }
.tg.er { background: rgba(8,217,214,.13); color: #6fdedb; }

/* 题库页里的多选题(只读展示) */
.bank-multi { padding: 4px 0 2px; }
.bank-multi-tag {
  display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 6px;
  background: rgba(8,217,214,.15); color: #6fdedb; margin-bottom: 8px;
}
.bank-multi-opt {
  font-size: 13px; color: var(--muted); padding: 4px 10px;
  background: rgba(255,255,255,.04); border-radius: 7px; margin-bottom: 5px;
}

/* 曲库页顶部的同步状态条 */
.lib-status {
  max-width: 680px; margin: 0 auto 14px; padding: 9px 14px;
  background: rgba(255,255,255,.04); border: 1px solid var(--border);
  border-radius: 10px; font-size: 12.5px; color: var(--muted); text-align: center;
}
.lib-status b { color: var(--text); }
.lib-status .sep { opacity: .35; margin: 0 6px; }
.lib-status.bad { border-color: #a33; background: rgba(200,50,50,.1); }
.lib-status .warn { color: #ff7a7a; }

/* 朋友体验版:藏掉维护类入口 */
.guest .top-links { display: none; }

/* 语言开关(只在朋友版) */
.lang-btn {
  background: rgba(255,255,255,.07); border: 1px solid var(--border); color: var(--muted);
  border-radius: 999px; padding: 5px 14px; font-size: 12px; cursor: pointer;
}
.lang-btn:hover { color: var(--text); border-color: var(--text); }

/* 隐私说明 */
.privacy-note {
  max-width: 640px; margin: 26px auto 34px; padding: 0 20px;
  font-size: 11px; line-height: 1.6; color: #55555f; text-align: center;
}

/* 反馈 */
.fb {
  margin-top: 22px; padding: 16px; border-radius: 14px;
  background: rgba(255,255,255,.04); border: 1px solid var(--border);
}
.fb-return { margin-top: 26px; }
.fb-title { font-size: 14px; font-weight: 700; }
.fb-sub { font-size: 11.5px; color: var(--muted); margin-top: 4px; }
.fb-btns { display: flex; gap: 8px; justify-content: center; margin-top: 12px; flex-wrap: wrap; }
.fb-b {
  background: var(--panel); border: 1.5px solid var(--border); color: var(--text);
  border-radius: 999px; padding: 8px 16px; font-size: 13px; cursor: pointer; transition: .15s;
}
.fb-b:hover { border-color: var(--accent); }
.fb-b.on { border-color: var(--accent); background: rgba(255,46,99,.16); }
.fb-note { margin-top: 12px; display: flex; gap: 8px; align-items: flex-start; }
.fb-text {
  flex: 1; background: rgba(0,0,0,.3); border: 1px solid var(--border);
  border-radius: 9px; color: var(--text); padding: 8px 10px; font-size: 13px; resize: vertical;
  font-family: inherit;
}
.fb-text:focus { outline: none; border-color: var(--accent); }

/* ==========================================================================
   手机 / 微信内置浏览器适配
   --------------------------------------------------------------------------
   起因:6 个选项的多选题在 375px 屏上会横向滚动。
   根因不是 .multi-grid 本身,而是它作为 .ab-cards(grid 容器)的子项,
   默认 min-width:auto —— 网格/弹性子项**不会收缩到比内容还窄**,
   于是 auto-fit 按 140px 排了 3 列(444px),把 335px 的父容器撑破。
   这是 grid/flex 最常见的溢出原因,凡是嵌套网格都要显式写 min-width:0。
   ========================================================================== */

/* 所有嵌套网格都要能收缩,否则同样的溢出还会再犯 */
.multi-grid, .style-cards, .plat-cards { min-width: 0; width: 100%; }
.multi-card, .style-card, .plat-card { min-width: 0; }
/* 长词(英文界面尤其)不能把卡片顶宽 */
.multi-label, .style-name, .ab-label { overflow-wrap: anywhere; }

@media (max-width: 480px) {
  /* 窄屏固定两列。auto-fit 在这个宽度会退化成一列,卡片拉得又宽又空 */
  .multi-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .style-cards { grid-template-columns: 1fr 1fr; gap: 10px; }
  .multi-card { padding: 14px 8px; }
  .multi-label { font-size: 13.5px; }
  .style-name { font-size: 14px; }
  #stage { padding-left: 14px; padding-right: 14px; }
  .ab-card { padding: 16px 14px; font-size: 15px; }
}

@media (max-width: 360px) {
  /* 小屏(iPhone SE / 老安卓)再紧一点,别让文字换行成三行 */
  .multi-label { font-size: 12.5px; }
  .multi-card { padding: 12px 6px; }
  .multi-emoji { font-size: 22px; }
}

/* 兜底:任何情况下页面都不该能横向拖动。
   这是防线不是修复 —— 真出现溢出还是要按上面那样找到具体原因。 */
html, body { max-width: 100%; overflow-x: hidden; }

/* 微信 / 安卓浏览器会自作主张放大字号,锁掉 */
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

/* 刘海屏:index.html 已经是 viewport-fit=cover,内容要自己躲开安全区,
   否则底部按钮会被 iPhone 的横条盖住 */
body { padding-bottom: env(safe-area-inset-bottom); }
.top { padding-left: max(16px, env(safe-area-inset-left)); padding-right: max(16px, env(safe-area-inset-right)); }

/* 手机上点按目标不能小于 44px,不然容易点不中 */
@media (pointer: coarse) {
  .link-btn, .pill-btn, .ab-listen, .chip { min-height: 44px; }
  .ab-listen { min-width: 44px; }
}