/* ===================================================================
   IELTS 7.5 · 视觉系统 v3 — 清爽浅色 · 现代专业 (light, clean, pro)
   保留全部类名,仅换主题。网页/App 共用。
   =================================================================== */
:root {
  /* 背景与层 */
  --bg: #f4f6fb;
  --bg-2: #eef2f8;
  --surface: #ffffff;
  --surface-2: #f7f9fc;
  --surface-3: #eef2f8;
  --line: #e7ecf4;
  --line-strong: #d8e0ec;

  /* 文字 */
  --tx: #1e2a44;
  --tx-dim: #64748b;
  --tx-faint: #97a3b8;

  /* 品牌:清爽绿 + 暖橙点缀 */
  --brand: #10b981;
  --brand-2: #14b8a6;
  --brand-grad: linear-gradient(135deg, #10b981 0%, #34d399 100%);
  --hero-grad: linear-gradient(135deg, #059669 0%, #10b981 50%, #2dd4bf 118%);
  --tint: #ecfdf5;           /* 浅绿底 */
  --tint-line: #a7f3d0;      /* 浅绿边 */

  /* 技能色(浅底可读) */
  --c-vocab: #0d9488;
  --c-reading: #0ea5e9;
  --c-listening: #8b5cf6;
  --c-writing: #f59e0b;
  --c-speaking: #10b981;

  /* 语义 */
  --good: #16a34a;
  --warn: #f59e0b;
  --bad: #ef4444;
  --flame: #f59e0b;

  --radius: 18px;
  --radius-sm: 13px;
  --tabbar-h: 66px;
  --topbar-h: 54px;
  --shadow: 0 6px 20px rgba(30, 41, 59, 0.07), 0 1px 3px rgba(30, 41, 59, 0.05);
  --shadow-sm: 0 2px 8px rgba(30, 41, 59, 0.06);
  --shadow-glow: 0 8px 22px -8px rgba(16, 185, 129, 0.45);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(800px 420px at 88% -10%, rgba(16, 185, 129, 0.10), transparent 60%),
    radial-gradient(700px 420px at 5% 4%, rgba(45, 212, 191, 0.09), transparent 55%);
  background-attachment: fixed;
  color: var(--tx);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans SC", sans-serif;
  font-size: 16px; line-height: 1.55; letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}
::selection { background: rgba(16, 185, 129, 0.20); color: #111; }
::-webkit-scrollbar { width: 0; height: 0; }

/* ===== 顶部 ===== */
#topbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--topbar-h);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px) saturate(1.4); -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--line); z-index: 50; padding-top: env(safe-area-inset-top);
}
.topbar-inner { height: var(--topbar-h); display: flex; align-items: center; justify-content: space-between; padding: 0 18px; }
#tb-title { font-weight: 800; font-size: 18px; letter-spacing: 0.01em; color: var(--tx); }
.streak {
  font-size: 14px; font-weight: 800; color: var(--flame);
  background: #fff7ed; border: 1px solid #fed7aa; border-radius: 999px; padding: 5px 12px;
  display: flex; align-items: center; gap: 4px; box-shadow: var(--shadow-sm);
}

/* ===== 主区域 ===== */
#view {
  padding: calc(var(--topbar-h) + env(safe-area-inset-top) + 14px) 16px calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 18px);
  min-height: 100%; max-width: 720px; margin: 0 auto;
}

/* ===== 底部导航 ===== */
#tabbar {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom)); padding-bottom: env(safe-area-inset-bottom);
  display: flex; z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px) saturate(1.4); -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-top: 1px solid var(--line);
}
.tab {
  flex: 1; background: none; border: none; color: var(--tx-faint);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  font-size: 11px; font-weight: 600; cursor: pointer; position: relative; transition: color .2s; padding-top: 8px;
}
.tab .tab-ic { font-size: 22px; line-height: 1; transition: transform .25s cubic-bezier(.34,1.56,.64,1); filter: grayscale(.45) opacity(.7); }
.tab.active { color: var(--brand); }
.tab.active .tab-ic { transform: translateY(-3px) scale(1.12); filter: none; }
.tab.active::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 28px; height: 3px; border-radius: 0 0 4px 4px; background: var(--brand-grad);
}

/* ===== 卡片 ===== */
.card {
  position: relative; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin-bottom: 14px; box-shadow: var(--shadow);
}
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.card-title { font-weight: 800; font-size: 16px; display: flex; align-items: center; gap: 8px; }
.muted { color: var(--tx-dim); }
.faint { color: var(--tx-faint); font-size: 13px; }
.center { text-align: center; }
.row { display: flex; align-items: center; gap: 10px; }
.spread { display: flex; align-items: center; justify-content: space-between; }
.wrap { flex-wrap: wrap; }
.mt8{margin-top:8px}.mt12{margin-top:12px}.mt16{margin-top:16px}.mb8{margin-bottom:8px}
.hidden { display: none !important; }
h1,h2,h3 { margin: 0 0 6px; letter-spacing: -0.01em; }
.gradtext { background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.section-title { font-size: 12px; font-weight: 800; color: var(--tx-faint); text-transform: uppercase; letter-spacing: .1em; margin: 20px 6px 10px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--brand-grad); color: #fff; border: none; border-radius: var(--radius-sm);
  padding: 13px 20px; font-size: 15px; font-weight: 800; cursor: pointer; text-decoration: none;
  box-shadow: var(--shadow-glow); transition: transform .12s cubic-bezier(.34,1.56,.64,1), box-shadow .2s, filter .2s;
}
.btn:active { transform: scale(0.96); filter: brightness(1.05); }
.btn.block { display: flex; width: 100%; }
.btn.ghost { background: #fff; color: var(--brand); border: 1.5px solid var(--line-strong); box-shadow: var(--shadow-sm); }
.btn.ghost:active { background: var(--surface-2); }
.btn.sm { padding: 9px 14px; font-size: 13px; border-radius: 11px; box-shadow: none; }
.btn.good { background: linear-gradient(135deg, #16a34a, #22c55e); color: #fff; box-shadow: 0 8px 22px -10px rgba(22,163,74,.5); }
.btn.bad  { background: linear-gradient(135deg, #e11d48, #fb7185); color: #fff; box-shadow: 0 8px 22px -10px rgba(225,29,72,.45); }
.btn:disabled { opacity: .45; pointer-events: none; box-shadow: none; }

.pill { display:inline-flex; align-items:center; gap:5px; padding: 4px 11px; border-radius: 999px; font-size: 12px; font-weight: 800; background: var(--surface-2); color: var(--tx-dim); border: 1px solid var(--line); }
.pill.accent { background: var(--tint); color: var(--brand); border-color: var(--tint-line); }
.pill.good { background: #ecfdf5; color: var(--good); border-color: #a7f3d0; }
.pill.warn { background: #fffbeb; color: var(--warn); border-color: #fde68a; }

/* ===== 进度条 / 环 ===== */
.bar { height: 10px; background: var(--surface-3); border-radius: 999px; overflow: hidden; }
.bar > i { display:block; height: 100%; background: var(--brand-grad); border-radius: 999px; transition: width .6s cubic-bezier(.22,1,.36,1); }
.ring { position: relative; width: 104px; height: 104px; }
.ring svg { transform: rotate(-90deg); }
.ring .ring-tx { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; }
.ring .ring-tx b { font-size: 24px; font-weight: 800; }
.ring .ring-tx small { font-size: 11px; color: rgba(255,255,255,.85); }

/* ===== Hero(今日)===== */
.hero {
  position: relative; overflow: hidden; border-radius: 22px; padding: 22px;
  background: var(--hero-grad); border: none; color: #fff;
  box-shadow: 0 16px 36px -16px rgba(99,70,229,.55); margin-bottom: 16px;
}
.hero::after { content:""; position:absolute; top:-40%; right:-15%; width:220px; height:220px; border-radius:50%;
  background: radial-gradient(circle, rgba(255,255,255,.22), transparent 65%); pointer-events:none; }
.hero .hero-top { display:flex; justify-content:space-between; align-items:flex-start; position:relative; z-index:1; }
.hero .day-num { font-size: 30px; font-weight: 900; letter-spacing:-.02em; margin: 4px 0 8px; color:#fff; }
.hero .hero-sub { color: rgba(255,255,255,.9); font-size: 13px; }
.hero .theme-pill { display:inline-flex; align-items:center; gap:6px; background: rgba(255,255,255,.2); border:1px solid rgba(255,255,255,.3); color:#fff; padding:5px 12px; border-radius:999px; font-size:13px; font-weight:700; backdrop-filter: blur(4px); }

/* ===== 今日任务 ===== */
.task {
  display: flex; align-items: center; gap: 13px; padding: 13px; border-radius: var(--radius-sm);
  background: var(--surface); margin-bottom: 10px; cursor: pointer;
  border: 1px solid var(--line); box-shadow: var(--shadow-sm); transition: transform .12s, border-color .2s, box-shadow .2s;
}
.task:active { transform: scale(0.985); }
.task .t-ic {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 13px; display:flex; align-items:center; justify-content:center;
  font-size: 22px; background: var(--surface-2); border: 1px solid var(--line);
}
.task[data-skill="vocab"] .t-ic { background: #ecfeff; border-color: #a5f3fc; }
.task[data-skill="reading"] .t-ic { background: #eff6ff; border-color: #bfdbfe; }
.task[data-skill="listening"] .t-ic { background: #f5f3ff; border-color: #ddd6fe; }
.task[data-skill="writing"] .t-ic { background: #fffbeb; border-color: #fde68a; }
.task[data-skill="speaking"] .t-ic { background: #ecfdf5; border-color: #a7f3d0; }
.task .t-main { flex: 1; min-width: 0; }
.task .t-main b { font-size: 15px; font-weight: 700; }
.task .t-main .t-sub { font-size: 12.5px; color: var(--tx-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.task .t-check { width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--line-strong); flex-shrink: 0; display:flex; align-items:center; justify-content:center; font-size: 16px; color: transparent; transition: all .25s cubic-bezier(.34,1.56,.64,1); }
.task.done { background: #f6fef9; border-color: #bbf7d0; }
.task.done .t-check { background: linear-gradient(135deg,#16a34a,#22c55e); border-color: transparent; color: #fff; transform: scale(1.05); }
.task.done .t-main b { color: var(--tx-dim); text-decoration: line-through; }

/* ===== 闪卡(3D 翻转)===== */
.flip { perspective: 1400px; }
.flip-inner { position: relative; width: 100%; min-height: 260px; transition: transform .6s cubic-bezier(.4,.2,.2,1); transform-style: preserve-3d; }
.flip.flipped .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center;
  border-radius: 22px; padding: 28px 22px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow);
}
.flip-back { transform: rotateY(180deg); background: linear-gradient(180deg,#ffffff,#f7f9ff); }
.flash .word { font-size: 38px; font-weight: 900; letter-spacing: -.01em; color: var(--tx); }
.flash .ipa { color: var(--brand); font-size: 16px; margin-top: 8px; display:flex; align-items:center; gap:8px; justify-content:center; }
.flash .ipa .say-btn { width:34px;height:34px;border-radius:50%;background:var(--tint);border:1px solid var(--tint-line);display:flex;align-items:center;justify-content:center;font-size:16px; }
.flash .pos { font-style: italic; color: var(--tx-faint); font-size: 14px; margin-top: 6px; }
.flash .tap-hint { color: var(--tx-faint); font-size: 12.5px; margin-top: 18px; }
.flash .def { font-size: 19px; font-weight: 600; line-height: 1.4; color: var(--tx); }
.flash .def-zh { font-size: 17px; color: var(--brand); margin-top: 6px; font-weight: 700; }
.flash .ex { font-size: 15px; color: var(--tx-dim); margin-top: 16px; font-style: italic; line-height: 1.5; }
.flash .ex b { color: var(--brand); font-style: normal; background: var(--tint); padding: 0 4px; border-radius: 4px; }
.flash .syn { color: var(--tx-faint); font-size: 13px; margin-top: 12px; }

.grade-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.grade-row .btn { padding: 13px 4px; font-size: 13.5px; flex-direction: column; gap: 3px; }
.grade-row .btn small { font-weight: 600; opacity: .85; font-size: 10px; }

/* ===== 题目 ===== */
.q { margin-bottom: 20px; }
.q .q-stem { font-weight: 700; margin-bottom: 12px; line-height: 1.5; color: var(--tx); }
.q .q-stem u { text-decoration: none; border-bottom: 2px dashed var(--brand); padding: 0 14px; }
.opt {
  display: flex; align-items: center; gap: 10px; padding: 13px 15px; border: 1.5px solid var(--line);
  border-radius: var(--radius-sm); margin-bottom: 9px; cursor: pointer; background: #fff;
  transition: all .15s; font-size: 15px; color: var(--tx);
}
.opt::before { content:""; width:20px;height:20px;border-radius:50%;border:2px solid var(--line-strong); flex-shrink:0; transition: all .15s; }
.opt:active { transform: scale(.99); }
.opt.sel { border-color: var(--brand); background: var(--tint); }
.opt.sel::before { border-color: var(--brand); background: var(--brand); box-shadow: inset 0 0 0 3px #fff; }
.opt.correct { border-color: var(--good); background: #ecfdf5; }
.opt.correct::before { border-color: var(--good); background: var(--good); content:"✓"; color:#fff; font-weight:900; font-size:13px; display:flex;align-items:center;justify-content:center; }
.opt.wrong { border-color: var(--bad); background: #fff1f2; }
.opt.wrong::before { border-color: var(--bad); background: var(--bad); content:"✕"; color:#fff; font-weight:900; font-size:12px; display:flex;align-items:center;justify-content:center; }
input.opt::before { display:none; }
.explain { font-size: 13.5px; color: var(--tx-dim); background: var(--tint); border-left: 3px solid var(--brand); padding: 11px 13px; border-radius: 0 12px 12px 0; margin-top: 10px; line-height: 1.55; }

/* ===== 宽屏双栏:文章/听力 与 题目 同屏 ===== */
#view.wide { max-width: 1180px; }
.split-layout { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 920px) {
  .split-layout { grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr); align-items: start; }
  .split-layout .col-left, .split-layout .col-right {
    position: sticky; top: calc(var(--topbar-h) + 14px);
    max-height: calc(100vh - var(--topbar-h) - 30px); overflow-y: auto; padding-right: 4px;
  }
  .split-layout .col-left::-webkit-scrollbar, .split-layout .col-right::-webkit-scrollbar { width: 7px; }
  .split-layout .col-left::-webkit-scrollbar-thumb, .split-layout .col-right::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 7px; }
}
.split-layout .col-left, .split-layout .col-right { min-width: 0; }
.col-head { font-size: 12px; font-weight: 800; color: var(--tx-faint); text-transform: uppercase; letter-spacing: .08em; margin: 2px 4px 8px; }

/* ===== 阅读正文 ===== */
.passage { line-height: 1.8; font-size: 15.5px; color: #2a3650; }
.passage p { margin: 0 0 14px; }
.passage .para-label { display:inline-flex; align-items:center; justify-content:center; width:24px; height:24px; border-radius:7px; background: var(--brand-grad); color:#fff; font-weight:800; font-size:12px; margin-right: 8px; vertical-align: middle; }

/* ===== 听力脚本 ===== */
.script-line { margin-bottom: 10px; padding-left: 4px; }
.script-line .spk { color: var(--brand); font-weight: 800; }

/* ===== 文本域 ===== */
textarea.input {
  width: 100%; background: #fff; color: var(--tx); border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm); padding: 14px; font-size: 15px; font-family: inherit; resize: vertical; min-height: 180px; line-height: 1.6;
}
textarea.input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(16,185,129,.18); }
.wordcount { text-align: right; font-size: 13px; color: var(--tx-faint); margin-top: 6px; }

/* ===== 句型 ===== */
.phrase { background: var(--surface-2); border: 1px solid var(--line); border-radius: 12px; padding: 11px 13px; margin-bottom: 9px; font-size: 14.5px; line-height: 1.5; }
.phrase .ph-zh { color: var(--tx-faint); font-size: 12.5px; display:block; margin-top: 3px; }
details > summary { cursor: pointer; color: var(--tx-dim); }

/* ===== 工具条 / 列表 ===== */
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.list-item { display:flex; align-items:center; gap: 13px; padding: 14px; background: var(--surface); border:1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 10px; cursor: pointer; transition: transform .12s, box-shadow .2s; box-shadow: var(--shadow-sm); }
.list-item:active { transform: scale(.99); box-shadow: var(--shadow); }
.list-item .li-ic { width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:21px;background:var(--surface-2);border:1px solid var(--line); }
.list-item .li-main { flex:1; min-width:0; }
.list-item .li-main b { font-size: 15px; }
.list-item .li-arrow { color: var(--tx-faint); font-size: 20px; }
.list-item.locked { opacity: .5; }

/* ===== 返回头 ===== */
.subhead { display:flex; align-items:center; gap: 12px; margin-bottom: 16px; }
.back { background: #fff; border:1px solid var(--line-strong); color: var(--tx); border-radius: 12px; width: 40px; height: 40px; font-size: 19px; cursor:pointer; flex-shrink:0; box-shadow: var(--shadow-sm); transition: transform .12s; }
.back:active { transform: scale(.92); }
.subhead h2 { font-size: 19px; font-weight: 800; }

/* ===== 空状态 ===== */
.empty { text-align:center; color: var(--tx-faint); padding: 56px 20px; }
.empty .big { font-size: 52px; margin-bottom: 14px; }
.empty h2 { color: var(--tx); }

/* ===== 设置 ===== */
.set-row { display:flex; align-items:center; justify-content:space-between; padding: 14px 0; border-bottom: 1px solid var(--line); gap: 10px; }
.set-row:last-child { border-bottom: none; }
select { background: #fff; color: var(--tx); border:1px solid var(--line-strong); border-radius: 10px; padding: 8px 12px; font-size: 14px; }
input[type=range] { accent-color: var(--brand); }
input[type=checkbox] { accent-color: var(--brand); width:22px; height:22px; }

/* ===== 日历热图 ===== */
.cal { display: grid; grid-template-columns: repeat(7, 1fr); gap: 5px; }
.cal .cell { aspect-ratio: 1; border-radius: 6px; background: var(--surface-3); }
.cal .cell.lv1 { background: #a7f3d0;} .cal .cell.lv2{background:#34d399;} .cal .cell.lv3{background: var(--brand);}
.cal .cell.today { outline: 2px solid var(--warn); outline-offset: 1px; }

/* ===== 统计 ===== */
.stat-grid { display:grid; grid-template-columns: repeat(2,1fr); gap: 10px; }
.stat { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px; text-align:center; }
.stat b { font-size: 28px; display:block; font-weight: 800; line-height: 1.1; color: var(--tx); }
.stat small { color: var(--tx-dim); font-size: 12px; }

/* ===== 动画 ===== */
.fade-in { animation: viewIn .36s cubic-bezier(.22,1,.36,1); }
@keyframes viewIn { from { opacity: 0; transform: translateY(10px);} to {opacity:1; transform:none;} }
.pop-in { animation: popIn .3s cubic-bezier(.34,1.56,.64,1); }
@keyframes popIn { from { opacity:0; transform: scale(.9);} to {opacity:1; transform:none;} }

/* ===== Toast ===== */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + 28px); transform: translateX(-50%);
  background: #1e2a44; color: #fff; padding: 12px 20px; border-radius: 999px; font-size: 14px; font-weight: 700;
  z-index: 100; box-shadow: 0 12px 30px -8px rgba(30,41,59,.4); animation: toastIn .3s cubic-bezier(.34,1.56,.64,1);
}
@keyframes toastIn { from { opacity:0; transform: translate(-50%, 12px);} to {opacity:1; transform: translate(-50%,0);} }

/* ===== 庆祝彩屑 ===== */
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 200; overflow: hidden; }
.confetti-bit { position: absolute; width: 9px; height: 14px; top: -20px; border-radius: 2px; animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(720deg); opacity: .9; } }

/* ===== 登录/账户(Firebase)===== */
.auth-bar { display:flex; align-items:center; gap:8px; }
.avatar { width:30px;height:30px;border-radius:50%;border:1px solid var(--line-strong);object-fit:cover;background:var(--surface-2); }

/* ===== 登录封面页 ===== */
body.cover-mode #tabbar, body.cover-mode #topbar { display: none; }
body.cover-mode #view { padding: 0; max-width: none; }
.cover {
  min-height: 100vh; min-height: 100dvh; box-sizing: border-box;
  display: flex; flex-direction: column; justify-content: center; gap: 26px;
  max-width: 440px; margin: 0 auto; padding: 48px 24px calc(40px + env(safe-area-inset-bottom));
  animation: viewIn .5s cubic-bezier(.22,1,.36,1);
}
.cover-hero { text-align: center; }
.cover-logo {
  width: 88px; height: 88px; margin: 0 auto 18px; border-radius: 24px;
  background: var(--hero-grad); display: flex; align-items: center; justify-content: center;
  font-size: 46px; box-shadow: 0 14px 32px -10px rgba(16,185,129,.55);
}
.cover-title { font-size: 30px; font-weight: 900; letter-spacing: -.02em; margin: 0; }
.cover-tag { color: var(--tx-dim); font-size: 14.5px; margin: 8px 0 0; }
.cover-features { display: flex; flex-direction: column; gap: 11px; }
.cfeat { display: flex; gap: 13px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: 15px; padding: 14px; box-shadow: var(--shadow-sm); }
.cfeat .cf-ic { width: 42px; height: 42px; border-radius: 12px; background: var(--tint); display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.cfeat b { font-size: 15px; }
.cfeat small { display: block; color: var(--tx-dim); font-size: 12.5px; margin-top: 2px; }
.cover-actions { display: flex; flex-direction: column; gap: 12px; margin-top: 4px; }
.btn-google {
  display: flex; align-items: center; justify-content: center; gap: 11px;
  background: #fff; color: #1f2937; border: 1.5px solid var(--line-strong); border-radius: 14px;
  padding: 15px; font-size: 16px; font-weight: 700; cursor: pointer; box-shadow: var(--shadow-sm);
  transition: transform .12s, box-shadow .2s;
}
.btn-google:active { transform: scale(.97); }
.btn-google:disabled { opacity: .5; pointer-events: none; }
.cover-skip { background: none; border: none; color: var(--tx-dim); font-size: 14px; font-weight: 600; cursor: pointer; padding: 6px; }
.cover-skip:active { color: var(--brand); }
.cover-note { text-align: center; font-size: 12.5px; color: var(--tx-faint); min-height: 16px; }
.cover-foot { text-align: center; font-size: 12px; color: var(--tx-faint); }

.cover-splash { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; }
.spinner { width: 30px; height: 30px; border: 3px solid var(--line); border-top-color: var(--brand); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 实时 AI 口语对练 ===== */
.live-log { max-height: 260px; overflow-y: auto; margin-top: 12px; display: flex; flex-direction: column; gap: 8px; padding-right: 4px; }
.live-log:empty { display: none; }
.lv-msg { padding: 9px 13px; border-radius: 14px; font-size: 14px; line-height: 1.5; max-width: 90%; word-break: break-word; }
.lv-msg b { display: block; font-size: 10.5px; opacity: .7; margin-bottom: 3px; font-weight: 700; }
.lv-ex { background: rgba(255,255,255,.14); align-self: flex-start; border-bottom-left-radius: 4px; }
.lv-me { background: #ffffff; color: #064e3b; align-self: flex-end; border-bottom-right-radius: 4px; }
.btn.rec { animation: recpulse 1s ease-in-out infinite; }
@keyframes recpulse { 0%,100% { filter: brightness(1); transform: none; } 50% { filter: brightness(1.25); transform: scale(1.02); } }
.live-log::-webkit-scrollbar { width: 6px; }
.live-log::-webkit-scrollbar-thumb { background: rgba(255,255,255,.3); border-radius: 6px; }

/* ===== 封面 · 邮箱登录 ===== */
.cover-or { display:flex; align-items:center; gap:10px; color:var(--tx-faint); font-size:12.5px; margin:4px 0; }
.cover-or::before, .cover-or::after { content:""; flex:1; height:1px; background:var(--line); }
.cover-input { width:100%; box-sizing:border-box; background:#fff; color:var(--tx); border:1.5px solid var(--line-strong); border-radius:13px; padding:13px 14px; font-size:15px; }
.cover-input:focus { outline:none; border-color:var(--brand); box-shadow:0 0 0 3px rgba(16,185,129,.15); }