:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --surface-2: #efece4;
  --ink: #1b1830;
  --ink-2: #5d5a6e;
  --line: #e2ded3;
  --accent: #d98a0b;
  --accent-ink: #1b1830;
  --accent-soft: #fbecd2;
  --bar: #1b1830;
  --bar-ink: #f6f4ef;
  --radius: 14px;
  --tabbar-h: 62px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12101f;
    --surface: #1d1a30;
    --surface-2: #26223d;
    --ink: #f1eee6;
    --ink-2: #a8a4ba;
    --line: #322d4d;
    --accent: #f5a623;
    --accent-ink: #1b1830;
    --accent-soft: #3a2f1e;
    --bar: #1b1830;
    --bar-ink: #f1eee6;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  padding-bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
}
button { font: inherit; color: inherit; }
a { color: inherit; }

/* 頂部 */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: var(--bar); color: var(--bar-ink);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: .04em; }
.brand img { border-radius: 7px; }
.install-btn {
  border: 0; border-radius: 999px; padding: 6px 14px;
  background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 14px;
}

main { max-width: 720px; margin: 0 auto; padding: 16px 16px 32px; outline: none; }

/* 底部分頁 */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  display: grid; grid-template-columns: repeat(4, 1fr);
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--surface); border-top: 1px solid var(--line);
}
.tabbar a {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  text-decoration: none; color: var(--ink-2); font-size: 12px; min-height: 44px;
}
.tabbar a .ti { font-size: 20px; line-height: 1; }
.tabbar a.on { color: var(--ink); font-weight: 700; }
.tabbar a.on .ti { color: var(--accent); }

/* 公告 */
.notice {
  background: var(--accent-soft); border-left: 4px solid var(--accent);
  border-radius: 10px; padding: 10px 14px; margin-bottom: 14px; font-size: 15px;
}

/* 搜尋 */
.search {
  position: sticky; top: calc(56px + env(safe-area-inset-top)); z-index: 5;
  margin: -16px -16px 12px; padding: 12px 16px 10px; background: var(--bg);
}
.search input {
  width: 100%; font-size: 16px; padding: 12px 14px 12px 40px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface) no-repeat 13px center;
  color: var(--ink);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' fill='none' stroke='%238a8698' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='8' cy='8' r='6'/%3E%3Cpath d='M12.5 12.5L17 17'/%3E%3C/svg%3E");
}
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.meta { color: var(--ink-2); font-size: 14px; margin: 0 2px 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 12px; }

/* 歌曲卡片 */
.song {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 10px; overflow: hidden;
}
.song > button {
  width: 100%; display: grid; grid-template-columns: 40px 1fr auto; gap: 12px; align-items: center;
  padding: 12px 14px; background: none; border: 0; text-align: left; cursor: pointer; min-height: 64px;
}
.no {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: var(--surface-2); font-weight: 700; font-variant-numeric: tabular-nums;
}
.title { font-weight: 700; font-size: 17px; line-height: 1.3; }
.artist { color: var(--ink-2); font-size: 14px; }
.key {
  font-size: 12px; padding: 3px 8px; border-radius: 999px; white-space: nowrap;
  border: 1px solid var(--line); color: var(--ink-2);
}
.key.set { background: var(--accent-soft); border-color: transparent; color: var(--ink); font-weight: 600; }
.lineup { padding: 4px 14px 14px; border-top: 1px dashed var(--line); }
.row { display: grid; grid-template-columns: 64px 1fr; gap: 8px; padding: 6px 0; align-items: start; }
.row .inst { color: var(--ink-2); font-size: 14px; padding-top: 5px; }
.row .names { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  border: 1px solid var(--line); background: var(--surface-2); border-radius: 999px;
  padding: 4px 12px; font-size: 15px; text-decoration: none; min-height: 32px;
}
.chip.me, .chip.hit { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.pending { color: var(--ink-2); font-style: normal; opacity: .8; }

/* 團員 */
.alpha { color: var(--ink-2); font-size: 13px; margin: 14px 2px 6px; }
.member-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.member-head {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin-bottom: 14px;
}
.member-head h1 { margin: 0 0 4px; font-size: 26px; }
.stat { font-size: 15px; color: var(--ink-2); }
.stat b { color: var(--ink); font-size: 20px; }
.tally { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.tally span { background: var(--surface-2); border-radius: 8px; padding: 4px 10px; font-size: 14px; }
.btn {
  border: 1px solid var(--line); background: var(--surface); border-radius: 10px;
  padding: 8px 14px; min-height: 40px; cursor: pointer;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.back { display: inline-block; margin: 0 0 12px; color: var(--ink-2); text-decoration: none; font-size: 15px; }
.role { font-size: 13px; background: var(--accent-soft); border-radius: 6px; padding: 2px 8px; margin-left: 6px; white-space: nowrap; }

/* 尚未開放 */
.soon {
  text-align: center; padding: 48px 20px; color: var(--ink-2);
  background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius);
}
.soon .big { font-size: 40px; }
.soon h2 { color: var(--ink); margin: 8px 0 4px; }

/* iPhone 加入主畫面提示 */
.ios-hint {
  position: fixed; left: 12px; right: 12px; z-index: 20;
  bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 12px);
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--bar); color: var(--bar-ink); border-radius: 14px; padding: 14px 14px 14px 16px;
  box-shadow: 0 8px 30px rgba(0,0,0,.25);
}
.ios-hint p { margin: 4px 0 0; font-size: 14px; opacity: .9; }
.ios-hint button { background: none; border: 0; color: inherit; font-size: 18px; padding: 0 4px; min-width: 32px; min-height: 32px; }
.share-ico { display: inline-block; padding: 0 4px; border: 1px solid currentColor; border-radius: 5px; font-size: 12px; }

.empty { text-align: center; color: var(--ink-2); padding: 32px 0; }
.offline { font-size: 13px; color: var(--ink-2); text-align: center; margin-top: 16px; }

/* ---------- 管理者後台 ---------- */
.admin-entry { text-align: center; margin: 28px 0 8px; }
.admin-entry a { color: var(--ink-2); font-size: 13px; text-decoration: none; padding: 8px 12px; }
.admin-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.linkish { background: none; border: 0; color: var(--ink-2); text-decoration: underline; padding: 8px; cursor: pointer; }
.admin-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; background: var(--surface-2); border-radius: 12px; padding: 4px; margin-bottom: 14px; }
.admin-tabs a { text-align: center; padding: 8px 0; border-radius: 9px; text-decoration: none; color: var(--ink-2); font-weight: 600; }
.admin-tabs a.on { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.admin-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 12px; }
.admin-actions .meta { margin: 0; }
a.btn { display: inline-flex; align-items: center; text-decoration: none; }
.admin-list { list-style: none; margin: 0; padding: 0; }
.admin-list li {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 10px 10px 12px; margin-bottom: 8px;
}
.admin-list li.flash { outline: 2px solid var(--accent); }
.admin-list .no { width: 34px; height: 34px; font-size: 14px; flex: none; }
.admin-list small { color: var(--ink-2); }
.admin-list input { font-size: 16px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); min-width: 0; }
.grow { flex: 1; min-width: 0; }
.icon {
  width: 40px; height: 40px; flex: none; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface-2); cursor: pointer; font-size: 16px;
}
.icon:disabled { opacity: .3; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.form h2 { margin: 0 0 6px; font-size: 20px; }
.form label { display: block; font-size: 14px; color: var(--ink-2); margin: 12px 0 0; }
.form input, .form textarea {
  display: block; width: 100%; margin-top: 4px; font: inherit; font-size: 16px; color: var(--ink);
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg);
}
.form input:focus, .form textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.form fieldset { border: 0; padding: 0; margin: 18px 0 0; }
.form legend { font-weight: 700; font-size: 16px; padding: 0; }
.part { display: grid; grid-template-columns: 7.5em 1fr 40px; gap: 6px; margin-bottom: 6px; }
.part input { margin: 0; }
.form-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.btn.wide { width: 100%; margin-top: 16px; }
.btn.danger { border-color: #c0392b; color: #c0392b; background: transparent; margin-left: auto; }
.btn:disabled { opacity: .6; }
.err { color: #c0392b; min-height: 1.5em; margin: 8px 0 0; font-size: 14px; }
.toast {
  position: fixed; left: 50%; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 16px); z-index: 30;
  background: var(--bar); color: var(--bar-ink); padding: 10px 18px; border-radius: 999px;
  transition: opacity .2s, transform .2s; font-size: 15px; max-width: calc(100% - 32px);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.bad { background: #c0392b; color: #fff; }

/* ---------- 練團預約 ---------- */
.date-chips { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; margin: 0 -16px 12px; padding-left: 16px; padding-right: 16px; }
.date-chips .chip { white-space: nowrap; cursor: pointer; font: inherit; font-size: 14px; }
.rooms { display: grid; gap: 12px; margin-top: 14px; }
@media (min-width: 640px) { .rooms { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); } }
.room { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }
.room h3 { margin: 0 0 8px; font-size: 17px; }
.slots { list-style: none; margin: 0; padding: 0; }
.slots li { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; margin-bottom: 6px; font-size: 15px; }
.slots .time { font-variant-numeric: tabular-nums; font-weight: 700; white-space: nowrap; min-width: 92px; }
.slots .gap { border: 1px dashed var(--line); color: var(--ink-2); }
.slots .taken { background: var(--surface-2); }
.slots .taken.mine { background: var(--accent-soft); outline: 1px solid var(--accent); }
.slots .lock { background: repeating-linear-gradient(135deg, var(--surface-2) 0 8px, transparent 8px 16px); color: var(--ink-2); }
.slots small { color: var(--ink-2); }
.btn.small { padding: 4px 12px; min-height: 34px; font-size: 14px; }
.mybook { background: var(--accent-soft); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 14px; }
.mybook h2 { margin: 0 0 6px; font-size: 16px; }
.mb-item { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid rgba(0,0,0,.06); }
.mb-item:first-of-type { border-top: 0; }
.form select {
  display: block; width: 100%; margin-top: 4px; font: inherit; font-size: 16px; color: var(--ink);
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg);
}
.form .label { font-size: 14px; color: var(--ink-2); margin: 12px 0 4px; }
.seg { display: flex; gap: 6px; flex-wrap: wrap; }
.seg button { flex: 1; min-width: 30%; padding: 10px 8px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; font-weight: 600; }
.seg button.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.warn { background: #fff4e0; border: 1px solid #f0b54d; color: #6b4300; border-radius: 10px; padding: 10px 12px; margin-top: 12px; font-size: 14px; }
@media (prefers-color-scheme: dark) { .warn { background: #3a2f1e; color: #f5d9a8; border-color: #8a6420; } }
.warn div { margin-top: 4px; }
.done h2 { margin: 6px 0; font-size: 22px; }
.done .lineup { border: 0; padding: 4px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.ok-badge { display: inline-block; background: #2e8b57; color: #fff; border-radius: 999px; padding: 4px 12px; font-weight: 700; font-size: 14px; }
.cal-links { display: grid; gap: 8px; margin-top: 14px; }
.cal-links .btn { justify-content: center; text-align: center; }
.cancel-box { margin-top: 12px; }
.cancel-box summary { cursor: pointer; color: var(--ink-2); }
.cancel-box form { display: grid; gap: 8px; margin-top: 10px; }
.cancel-box input { font-size: 16px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); }
.cancel-box .btn.danger { margin-left: 0; }
.admin-tabs { grid-template-columns: repeat(4, 1fr); }
.card + .card, .card.form + .card { margin-top: 12px; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1.3fr; gap: 8px; }
.inline-add { display: flex; gap: 8px; margin-top: 10px; }
.inline-add input { flex: 1; margin: 0; }
.move-row { gap: 6px; flex-wrap: wrap; background: var(--surface-2) !important; }
.move-row select, .move-row input { font-size: 16px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); }
.admin-list .btn.danger { margin-left: 0; }

/* ---------- AI 小幫手 ---------- */
.chat { padding-bottom: 90px; }
.chat-intro { text-align: center; color: var(--ink-2); padding: 8px 0 12px; }
.chat-intro .big { font-size: 34px; color: var(--accent); }
.chat-intro h2 { color: var(--ink); margin: 4px 0; font-size: 20px; }
.chat-intro p { margin: 0; font-size: 14px; }
.chat-log { display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 86%; padding: 10px 14px; border-radius: 16px; line-height: 1.6; font-size: 15px; word-break: break-word; }
.msg.me { align-self: flex-end; background: var(--accent); color: var(--accent-ink); border-bottom-right-radius: 4px; }
.msg.bot { align-self: flex-start; background: var(--surface); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg.refused { background: var(--surface-2); color: var(--ink-2); }
.msg.err { border-color: #c0392b; color: #c0392b; }
.msg.typing { color: var(--ink-2); font-style: italic; }
.examples { flex-direction: column; align-items: stretch; margin-top: 12px; }
.examples .chip { justify-content: flex-start; text-align: left; cursor: pointer; font: inherit; font-size: 14px; padding: 8px 14px; border-radius: 12px; }
.chat-input {
  position: fixed; left: 0; right: 0; z-index: 9;
  bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  display: flex; gap: 8px; padding: 10px 16px; background: var(--bg); border-top: 1px solid var(--line);
  max-width: 720px; margin: 0 auto;
}
.chat-input input { flex: 1; font-size: 16px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--ink); min-width: 0; }
.chat-foot { text-align: center; font-size: 12px; margin-top: 12px; }