/* ══════════════════════════════════════════════════════════════
   云学谷 · 智能数学 · 学习机端（2400×1600 横屏）
   设计基调：白色主色 + 蓝/浅蓝点缀 + 磨砂玻璃（毛玻璃）卡片 + 清爽深色字
   —— 主流学习机（作业帮 / 科大讯飞 / 学而思）当前一代的轻亮视觉语言，
     适合初中高中学生审美，长时间学习不易疲劳。
   图标：C4D 风格 3D 渲染图（assets/c4d/*.png），小图标用 emoji。
   缩放：html 用 vw 等比缩放 —— 同一份界面在学习机与笔记本预览上比例一致。
   ══════════════════════════════════════════════════════════════ */

/* ───────────── 设计令牌 ───────────── */
:root {
  --bg: #f0f5ff;
  --bg2: #ffffff;
  --bg-grad: linear-gradient(180deg, #fbfdff 0%, #f1f7ff 50%, #e8f1ff 100%);

  --glass-a: rgba(255, 255, 255, 0.78);
  --glass-b: rgba(235, 245, 255, 0.64);
  --glass-c: rgba(255, 255, 255, 0.55);
  --line: rgba(59, 130, 246, 0.12);
  --line2: rgba(59, 130, 246, 0.24);

  --tx: #0f172a;
  --tx2: #475569;
  --tx3: #94a3b8;

  --blue: #3b82f6;
  --violet: #8b5cf6;
  --cyan: #06b6d4;
  --gold: #f59e0b;
  --green: #10b981;
  --red: #f43f5e;

  --grad: linear-gradient(135deg, #3b82f6, #60a5fa);
  --grad-gold: linear-gradient(135deg, #fbbf24, #f59e0b);
  --grad-good: linear-gradient(135deg, #34d399, #22d3ee);

  --shadow-soft: 0 0.6rem 1.6rem rgba(59, 130, 246, 0.08), 0 0.2rem 0.5rem rgba(15, 23, 42, 0.04);
  --shadow-soft-inset: inset 0 1px 0 rgba(255, 255, 255, 0.85);

  --r-lg: 1.35rem;
  --r-md: 1rem;
  --r-sm: 0.7rem;
}

/* ───────────── 基础 ───────────── */
* { box-sizing: border-box; }

/* 学习机是 2400×1600 固定屏幕 → 用 vw 等比缩放，保证版式在任何缩放级别下一致 */
html { font-size: clamp(13px, 1.04vw, 25px); }

html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--bg-grad);
  color: var(--tx);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
body { position: relative; }

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; }
img { display: block; }
.hidden { display: none !important; }
.dim { color: var(--tx3); }
.tiny { font-size: 0.78rem; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(59, 130, 246, 0.22); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: rgba(59, 130, 246, 0.38); }

/* ───────────── 背景光效（科技感底子） ───────────── */
.bg-fx, .login-fx { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.55; }
.orb.o1 { width: 46rem; height: 46rem; left: -12rem; top: -16rem; background: radial-gradient(circle, #93c5fd 0%, rgba(147, 197, 253, 0) 68%); opacity: 0.45; }
.orb.o2 { width: 40rem; height: 40rem; right: -10rem; top: -10rem; background: radial-gradient(circle, #c4b5fd 0%, rgba(196, 181, 253, 0) 68%); opacity: 0.4; }
.orb.o3 { width: 44rem; height: 44rem; left: 32%; bottom: -22rem; background: radial-gradient(circle, #67e8f9 0%, rgba(103, 232, 249, 0) 70%); opacity: 0.32; }
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.055) 1px, transparent 1px);
  background-size: 3.4rem 3.4rem;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 100%);
}

/* ───────────── 磨砂玻璃卡片 ───────────── */
.glass {
  position: relative;
  background: linear-gradient(158deg, var(--glass-a), var(--glass-b) 55%, var(--glass-c));
  backdrop-filter: blur(26px) saturate(180%);
  -webkit-backdrop-filter: blur(26px) saturate(180%);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow:
    var(--shadow-soft),
    var(--shadow-soft-inset);
}

.card { padding: 1.1rem 1.25rem; }
.card-head {
  display: flex; align-items: center; gap: 0.6rem;
  margin-bottom: 0.75rem;
}
.card-head h3 { margin: 0; font-size: 0.98rem; font-weight: 700; letter-spacing: 0.01em; }
.card-head > *:last-child { margin-left: auto; }

.sec-title {
  display: flex; align-items: center; gap: 0.55rem;
  margin: 1.1rem 0 0.65rem; font-size: 1.02rem; font-weight: 700;
}
.sec-title:first-child { margin-top: 0; }
.sec-title i {
  width: 0.26rem; height: 1rem; border-radius: 4px;
  background: var(--grad); box-shadow: 0 0 0.7rem rgba(59, 130, 246, 0.8);
}
.sec-title button { margin-left: auto; }

/* ───────────── 通用控件 ───────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.62rem 1.15rem; border-radius: 0.85rem;
  font-size: 0.9rem; font-weight: 600; white-space: nowrap;
  background: rgba(59, 130, 246, 0.07);
  border: 1px solid var(--line2);
  color: var(--tx);
  transition: transform 0.16s, box-shadow 0.16s, background 0.16s;
}
.btn:hover { background: rgba(59, 130, 246, 0.13); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary {
  background: var(--grad); border-color: transparent; color: #fff;
  box-shadow: 0 0.7rem 1.6rem rgba(59, 130, 246, 0.35);
}
.btn.primary:hover { box-shadow: 0 0.9rem 2rem rgba(59, 130, 246, 0.5); }
.btn.gold { background: var(--grad-gold); border-color: transparent; color: #3a2405; }
.btn.ghost { background: rgba(255, 255, 255, 0.55); border-color: var(--line); }
.btn.tiny { padding: 0.34rem 0.7rem; font-size: 0.74rem; border-radius: 0.6rem; gap: 0.3rem; }
.btn-ic { width: 1.5rem; height: 1.5rem; object-fit: contain; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.chip {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 0.16rem 0.55rem; border-radius: 999px;
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.02em;
  background: rgba(59, 130, 246, 0.07);
  border: 1px solid var(--line2);
  color: var(--tx2);
  white-space: nowrap;
}
.chip.amber { background: rgba(245, 181, 68, 0.14); border-color: rgba(245, 181, 68, 0.35); color: #b45309; }
.chip.bad { background: rgba(251, 113, 133, 0.12); border-color: rgba(251, 113, 133, 0.32); color: #be123c; }
.chip.ok { background: rgba(52, 211, 153, 0.12); border-color: rgba(52, 211, 153, 0.32); color: #047857; }
.chip-btn {
  padding: 0.3rem 0.7rem; border-radius: 999px; font-size: 0.74rem;
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line2); color: var(--tx2);
}
.chip-btn:hover { color: var(--blue); background: rgba(59, 130, 246, 0.12); }

.tag {
  display: inline-block; padding: 0.22rem 0.6rem; border-radius: 999px;
  font-size: 0.7rem; color: var(--tx2);
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line);
}

.bar { height: 0.42rem; border-radius: 999px; background: rgba(59, 130, 246, 0.1); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 999px; background: var(--grad); transition: width 0.7s cubic-bezier(0.2, 0.8, 0.2, 1); }
.bar.gold > i { background: var(--grad-gold); }
.bar.good > i { background: var(--grad-good); }

.tabs { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.tab {
  padding: 0.42rem 0.95rem; border-radius: 999px; font-size: 0.82rem;
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line); color: var(--tx2);
}
.tab.on { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 0.4rem 1rem rgba(59, 130, 246, 0.3); }
.tab:hover { color: var(--blue); }

/* ══════════════════ 登录 ══════════════════ */
.login {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: var(--bg-grad); overflow: hidden; z-index: 100;
}
.login-card {
  position: relative; z-index: 2;
  width: min(30rem, 88vw); padding: 2.2rem 2rem;
  background: linear-gradient(158deg, var(--glass-a), var(--glass-b) 60%);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid var(--line2);
  border-radius: 1.8rem;
  box-shadow: var(--shadow-soft), var(--shadow-soft-inset);
}
.login-brand { display: flex; align-items: center; gap: 0.9rem; margin-bottom: 1.6rem; }
.lg-logo {
  width: 3rem; height: 3rem; border-radius: 1rem; display: grid; place-items: center;
  background: var(--grad); color: #fff; font-size: 1.5rem; font-weight: 700;
  box-shadow: 0 0.7rem 1.6rem rgba(59, 130, 246, 0.35);
}
.lg-logo.sm { width: 2rem; height: 2rem; font-size: 1rem; border-radius: 0.6rem; }
.login-brand h1 { margin: 0; font-size: 1.32rem; letter-spacing: 0.02em; }
.login-brand p { margin: 0.2rem 0 0; font-size: 0.8rem; color: var(--tx3); }

.lg-fields { display: flex; flex-direction: column; gap: 0.85rem; }
.lg-fields label { display: flex; flex-direction: column; gap: 0.35rem; }
.lg-fields span { font-size: 0.78rem; color: var(--tx2); }
.lg-fields input, .lg-fields select {
  padding: 0.72rem 0.95rem; border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--line2);
  color: var(--tx); outline: none;
  transition: border-color 0.16s, box-shadow 0.16s;
}
.lg-fields input::placeholder { color: var(--tx3); }
.lg-fields input:focus, .lg-fields select:focus {
  border-color: rgba(59, 130, 246, 0.65);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18);
}
.lg-fields select option { background: #f8fbff; color: var(--tx); }

.lg-go {
  width: 100%; margin-top: 1.4rem; padding: 0.85rem;
  border-radius: 0.95rem; font-size: 1rem; font-weight: 700; color: #fff;
  background: var(--grad);
  box-shadow: 0 0.9rem 2rem rgba(59, 130, 246, 0.35);
  transition: transform 0.16s, box-shadow 0.16s;
}
.lg-go:hover { transform: translateY(-2px); box-shadow: 0 1.2rem 2.6rem rgba(59, 130, 246, 0.5); }
.lg-go:disabled { opacity: 0.6; transform: none; }
.lg-hint { margin: 0.9rem 0 0; font-size: 0.76rem; color: var(--tx3); text-align: center; line-height: 1.5; }
.lg-hint.bad { color: #e11d48; }

/* ══════════════════ 应用外壳 ══════════════════ */
.app { position: fixed; inset: 0; display: flex; flex-direction: column; }

/* ───────── 顶部信息栏 ───────── */
.topbar {
  flex: 0 0 auto; position: relative; z-index: 30;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem;
  padding: 0.5rem 1.1rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 251, 255, 0.72));
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  border-bottom: 1px solid var(--line);
}
.tb-left { display: flex; align-items: center; gap: 0.7rem; min-width: 0; }
.ava {
  flex: 0 0 auto; width: 2.6rem; height: 2.6rem; border-radius: 50%;
  display: grid; place-items: center; font-size: 1.05rem; font-weight: 700; color: #fff;
  background: var(--grad);
  border: 2px solid rgba(255, 255, 255, 0.65);
  box-shadow: 0 0.5rem 1.2rem rgba(59, 130, 246, 0.32);
}
.who { min-width: 0; }
.who b { display: block; font-size: 0.92rem; }
.who-meta { display: flex; gap: 0.35rem; margin-top: 0.22rem; }

.topnav {
  display: flex; gap: 0.15rem; padding: 0.24rem;
  border-radius: 1rem; background: rgba(59, 130, 246, 0.06);
  border: 1px solid var(--line);
}
.nav-btn {
  padding: 0.44rem 0.95rem; border-radius: 0.72rem;
  font-size: 0.85rem; font-weight: 600; color: var(--tx2); white-space: nowrap;
  transition: background 0.16s, color 0.16s, box-shadow 0.16s;
}
.nav-btn:hover { color: var(--blue); background: rgba(59, 130, 246, 0.09); }
.nav-btn.on {
  color: #fff; background: var(--grad);
  box-shadow: 0 0.45rem 1.1rem rgba(59, 130, 246, 0.35);
}

.tb-right { display: flex; align-items: center; gap: 0.55rem; justify-self: end; }
.clock { font-size: 0.86rem; font-weight: 600; font-variant-numeric: tabular-nums; color: var(--tx2); }
.icon-btn {
  width: 2rem; height: 2rem; border-radius: 0.6rem; display: grid; place-items: center;
  background: rgba(59, 130, 246, 0.07); border: 1px solid var(--line2); color: var(--tx2);
}
.icon-btn:hover { color: var(--blue); background: rgba(59, 130, 246, 0.13); }

/* ───────── 内容区 ───────── */
.main {
  flex: 1 1 auto; overflow-y: auto; overflow-x: hidden;
  padding: 1.05rem 1.15rem 7.6rem;      /* 底部留出 dock 的高度 */
  position: relative; z-index: 10;
  display: flex; flex-direction: column;
}
/* 每个页面都撑满可视高度 —— 否则学习机大屏上底部会出现一大片死空间。
   做法：.view 是纵向 flex，最后一个区块 flex:1 自动吃掉剩余高度。 */
.view {
  flex: 1 1 auto; display: flex; flex-direction: column; gap: 1rem;
  animation: viewIn 0.32s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.view > * { flex: 0 0 auto; }
.view > *:last-child { flex: 1 1 auto; }
.view > .sec-title { margin: 0; }
@keyframes viewIn { from { opacity: 0; transform: translateY(0.6rem); } to { opacity: 1; transform: none; } }

/* ───────── 底部导航 dock（白色磨砂玻璃胶囊 + 干净 C4D 图标+文字） ───────── */
.dock {
  position: absolute; left: 50%; bottom: 0.95rem; transform: translateX(-50%);
  z-index: 40;
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.35rem 0.8rem;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  border: 1px solid var(--line);
  border-radius: 2rem;
  box-shadow: var(--shadow-soft), var(--shadow-soft-inset);
}
.dock-btn {
  display: flex; flex-direction: column; align-items: center; gap: 0.18rem;
  width: 5.4rem; padding: 0.3rem 0.2rem 0.24rem;
  border-radius: 1rem;
  background: transparent;
  color: var(--tx2); font-size: 0.72rem; font-weight: 600;
  transition: transform 0.18s, color 0.18s, background 0.18s;
}
.dock-btn img {
  width: 2.7rem; height: 2.7rem; object-fit: contain;
  filter: drop-shadow(0 0.35rem 0.6rem rgba(59, 130, 246, 0.18));
  transition: transform 0.18s;
}
.dock-btn:hover { background: rgba(59, 130, 246, 0.08); color: var(--blue); transform: translateY(-3px); }
.dock-btn:hover img { transform: scale(1.08) rotate(-3deg); }
.dock-btn.on { background: rgba(59, 130, 246, 0.12); color: var(--blue); }
.dock-btn.on img { transform: scale(1.06); }

/* ══════════════════ 首页 ══════════════════ */
.home-top { display: grid; grid-template-columns: 1.62fr 1fr; gap: 1rem; }

.hero {
  display: grid; grid-template-columns: 1.75fr 1fr; gap: 1rem;
  padding: 1.5rem 1.7rem;
  overflow: hidden;
}
.hero::after {
  content: ''; position: absolute; right: -6rem; top: -8rem;
  width: 24rem; height: 24rem; border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.4), rgba(139, 92, 246, 0) 68%);
  pointer-events: none;
}
.hero-l { position: relative; z-index: 1; }
.hero-hi { font-size: 0.86rem; color: var(--cyan); letter-spacing: 0.04em; margin-bottom: 0.5rem; }
.hero h1 {
  margin: 0 0 0.6rem; font-size: 2.05rem; line-height: 1.16; letter-spacing: -0.01em;
  background: linear-gradient(96deg, #0f172a 20%, #3b82f6 60%, #06b6d4 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { margin: 0 0 1.15rem; font-size: 0.86rem; color: var(--tx2); line-height: 1.6; max-width: 30rem; }
.hero-btns { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.hero-tags { display: flex; gap: 0.45rem; margin-top: 1rem; flex-wrap: wrap; }

.hero-r { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.7rem; position: relative; z-index: 1; }
.ring { position: relative; width: 8.6rem; height: 8.6rem; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: rgba(59, 130, 246, 0.09); stroke-width: 10; }
.ring-fg {
  fill: none; stroke: #5b8cff; stroke-width: 10; stroke-linecap: round;
  stroke-dasharray: 314.16; stroke-dashoffset: 314.16;
  filter: drop-shadow(0 0 0.6rem rgba(91, 140, 255, 0.85));
  transition: stroke-dashoffset 0.9s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.ring-txt { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.ring-txt b { display: block; font-size: 1.85rem; line-height: 1.1; }
.ring-txt span { font-size: 0.68rem; color: var(--tx3); }
.ring-lv { font-size: 0.78rem; color: var(--tx2); text-align: center; }

.minis { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.mini { padding: 0.85rem 1rem; display: flex; flex-direction: column; gap: 0.15rem; }
.mini i { font-size: 1.15rem; font-style: normal; }
.mini b { font-size: 1.5rem; line-height: 1.15; font-variant-numeric: tabular-nums; }
.mini span { font-size: 0.72rem; color: var(--tx3); }

.home-mid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.last-lesson .ll-q {
  font-size: 1.05rem; font-weight: 700; margin-bottom: 0.45rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.last-lesson .ll-meta { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.85rem; }

/* ── 空状态（新学生第一次打开学习机看到的就是这里）──
   绝不能只丢一行字在一张 800px 高的卡片里：居中 + 大图标 + 「怎么用」+ 下一步动作。 */
.empty-wrap {
  flex: 1 1 auto; min-height: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: 0.75rem; padding: 1rem 2.5rem;
}
.empty-ic {
  font-size: 3.2rem; line-height: 1;
  filter: drop-shadow(0 0.6rem 1.4rem rgba(59, 130, 246, 0.5));
}
.empty-t { margin: 0; font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; }
.empty-p {
  margin: 0; max-width: 34rem;
  font-size: 0.86rem; line-height: 1.75; color: var(--tx2);
}
.empty-p b { color: var(--tx); }

/* 空状态里的「三步上手」 */
.ll-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.7rem; width: 100%; max-width: 46rem; margin-top: 0.35rem; }
.ll-steps > div {
  padding: 0.85rem 0.9rem; border-radius: var(--r-md); text-align: left;
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
}
.ll-steps b {
  display: grid; place-items: center; width: 1.6rem; height: 1.6rem; margin-bottom: 0.45rem;
  border-radius: 50%; font-size: 0.8rem; color: #fff; background: var(--grad);
  box-shadow: 0 0.4rem 1rem rgba(59, 130, 246, 0.5);
}
.ll-steps span { display: block; font-size: 0.88rem; font-weight: 700; }
.ll-steps i { display: block; margin-top: 0.15rem; font-size: 0.72rem; font-style: normal; color: var(--tx3); line-height: 1.5; }

/* 上节课的四个课堂指标 */
.ll-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.6rem; margin-bottom: 0.9rem; }
.ll-stats > div {
  padding: 0.6rem 0.7rem; border-radius: var(--r-md);
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
}
.ll-stats b { display: block; font-size: 1.35rem; line-height: 1.15; font-variant-numeric: tabular-nums; }
.ll-stats span { display: block; font-size: 0.7rem; color: var(--tx3); margin-top: 0.1rem; }

/* 板书 / 老师的观察 两列 */
.ll-cols { display: grid; grid-template-columns: 1.05fr 1fr; gap: 0.9rem; margin-bottom: 0.4rem; }
.ll-col { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.ll-sec {
  margin: 0 0 0.5rem; font-size: 0.78rem; font-weight: 700; color: var(--tx2);
  letter-spacing: 0.02em;
}
.ll-board {
  flex: 1 1 auto; min-height: 0; overflow: hidden;
  padding: 0.75rem 0.9rem; border-radius: var(--r-sm);
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line);
  font-size: 0.78rem; line-height: 1.75; color: var(--tx2);
  word-break: break-word;
  /* 板书是多行文本，HTML 默认会把换行折叠成空格 —— 那样几个行内公式会挤成一坨 */
  white-space: pre-wrap;
}
.ll-board .katex { font-size: 0.95em; }
.ll-obs { margin: 0; padding: 0 0 0 1.05rem; display: flex; flex-direction: column; gap: 0.35rem; }
.ll-obs li { font-size: 0.8rem; line-height: 1.55; color: var(--tx2); }
.ll-obs li::marker { color: var(--cyan); }
.ll-btns { margin-top: auto; padding-top: 0.9rem; }

.weak-mini { display: flex; flex-direction: column; gap: 0.5rem; }
.wm-row {
  display: grid; grid-template-columns: 1.35rem 1fr auto 7rem 2.8rem;
  align-items: center; gap: 0.6rem;
  padding: 0.5rem 0.65rem; border-radius: var(--r-sm);
  background: rgba(59, 130, 246, 0.03);
  border: 1px solid transparent;
  transition: background 0.16s, border-color 0.16s;
}
.wm-row:hover { background: rgba(59, 130, 246, 0.065); border-color: var(--line); }
.wm-row .wm-idx {
  width: 1.35rem; height: 1.35rem; border-radius: 0.4rem; display: grid; place-items: center;
  font-size: 0.68rem; font-weight: 700; color: var(--tx3);
  background: rgba(59, 130, 246, 0.05); border: 1px solid var(--line);
}
.wm-row .nm { font-size: 0.86rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.wm-row .src {
  font-size: 0.64rem; padding: 0.06rem 0.34rem; border-radius: 0.3rem; white-space: nowrap;
  color: var(--cyan); background: rgba(34, 211, 238, 0.14);
  border: 1px solid rgba(34, 211, 238, 0.3);
}
/* 非课堂来源时留空 —— 但格子必须占住。少了这一列，后面的进度条会掉进 auto 列被压成 0 宽 */
.wm-row .src:empty { visibility: hidden; }
.wm-row .pct { font-size: 0.76rem; color: var(--tx3); text-align: right; font-variant-numeric: tabular-nums; }

/* ── 首页一屏适配 ──
   快捷入口磁贴已移除；首页只剩「英雄区 + 4 数据小卡 + 两张内容卡」。
   目标：2400×1600 学习机上正好一屏显示完，绝不出现上下滚动。 */
#view-home { min-height: 0; }
.home-mid { min-height: 0; align-items: stretch; }
.home-mid > .card { display: flex; flex-direction: column; min-height: 0; }

/* 「继续上次的课」：卡片内纵向撑开，板书/观察吃掉中段，按钮吸到卡片底部 */
.home-mid .last-lesson { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; }
.home-mid .last-lesson .ll-cols { flex: 1 1 auto; min-height: 0; }

/* 「待巩固的知识点」：条目在卡片内均匀铺开，填满但不拥堵 */
.home-mid .weak-mini { flex: 1 1 auto; justify-content: space-evenly; min-height: 0; }
/* 空状态时反过来要居中（由 .empty-wrap 自己撑满） */
.home-mid .weak-mini > .empty-wrap { margin: 0; }

/* ══════════════════ 我的 ══════════════════ */
.mine-top { display: grid; grid-template-columns: 1.1fr 1.5fr; gap: 1rem; }
.profile-card { display: flex; flex-direction: column; justify-content: space-between; }
.pc-head { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 0.9rem; }
.pc-ava {
  width: 3.4rem; height: 3.4rem; border-radius: 50%; display: grid; place-items: center;
  font-size: 1.35rem; font-weight: 700; color: #fff;
  background: var(--grad); border: 2px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 0.6rem 1.4rem rgba(59, 130, 246, 0.45);
}
.pc-who { flex: 1; min-width: 0; }
.pc-who b { display: block; font-size: 1.1rem; }
.pc-who span { font-size: 0.76rem; color: var(--tx3); }
.pc-rows { display: flex; flex-direction: column; gap: 0.45rem; }
.pc-row { display: flex; justify-content: space-between; gap: 0.6rem; font-size: 0.82rem; padding-bottom: 0.45rem; border-bottom: 1px dashed rgba(59, 130, 246, 0.07); }
.pc-row span:first-child { color: var(--tx3); }
.pc-row span:last-child { color: var(--tx); font-weight: 600; }
.pc-actions { display: flex; gap: 0.5rem; margin-top: 0.9rem; }

.mine-stat { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.stat-card {
  padding: 1rem 1.1rem; border-radius: var(--r-lg);
  background: linear-gradient(158deg, var(--glass-a), var(--glass-b) 60%);
  backdrop-filter: blur(26px) saturate(150%);
  -webkit-backdrop-filter: blur(26px) saturate(150%);
  border: 1px solid var(--line);
  box-shadow: 0 1rem 2.2rem rgba(15, 23, 42, 0.1), inset 0 1px 0 rgba(59, 130, 246, 0.12);
}
.stat-card b { display: block; font-size: 1.75rem; line-height: 1.15; font-variant-numeric: tabular-nums; }
.stat-card span { display: block; font-size: 0.75rem; color: var(--tx3); margin: 0.15rem 0 0.6rem; }

.mine-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.weak-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.weak-list li {
  display: grid; grid-template-columns: 1fr auto 5.5rem 2.6rem; align-items: center; gap: 0.55rem;
  font-size: 0.83rem;
}
.weak-list .nm { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.weak-list .src {
  font-size: 0.62rem; padding: 0.08rem 0.4rem; border-radius: 999px;
  background: rgba(34, 211, 238, 0.12); color: #0e7490; border: 1px solid rgba(34, 211, 238, 0.3);
}
.weak-list .track { height: 0.36rem; border-radius: 999px; background: rgba(59, 130, 246, 0.08); overflow: hidden; }
.weak-list .track i { display: block; height: 100%; border-radius: 999px; background: var(--grad-gold); }
.weak-list .pct { text-align: right; color: var(--tx3); font-size: 0.76rem; font-variant-numeric: tabular-nums; }

.lesson-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.6rem; }
.lesson-list li {
  padding: 0.7rem 0.85rem; border-radius: var(--r-md);
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
}
.lesson-list .lq { font-size: 0.86rem; font-weight: 600; margin-bottom: 0.32rem; }
.lesson-list .lm { display: flex; gap: 0.5rem; flex-wrap: wrap; font-size: 0.72rem; color: var(--tx3); }

/* ══════════════════ AI 老师（互动课堂） ══════════════════ */
/* ⚠️ 这里不能写 align-items:start —— 那会让右侧舞台不拉伸，课堂内容全挤在顶部。
   左栏保持自身高度用 align-self:start 单独控制即可。 */
.tutor-grid { display: grid; grid-template-columns: 15rem 1fr; gap: 1rem; min-height: 0; }

.tutor-side {
  padding: 1.2rem 1rem; display: flex; flex-direction: column; align-items: center; gap: 0.7rem;
  align-self: start; position: sticky; top: 0;
}

/* 数字人：4 态状态机 */
.ta { width: 8.5rem; height: 8.5rem; position: relative; }
.ta svg { width: 100%; height: 100%; overflow: visible; }
.ta .ta-eyes { transform-origin: 60px 64px; animation: taBlink 4.4s infinite; }
@keyframes taBlink { 0%, 92%, 100% { transform: scaleY(1); } 95% { transform: scaleY(0.1); } }
.ta .ta-mouth { transform-origin: 60px 79px; }
.ta .ta-wave { fill: none; stroke: transparent; stroke-width: 2; }
.ta.is-thinking { animation: taTilt 2.4s ease-in-out infinite; }
@keyframes taTilt { 0%, 100% { transform: rotate(0deg); } 50% { transform: rotate(-6deg) translateY(-3px); } }
.ta.is-speaking .ta-mouth { animation: taTalk 0.3s ease-in-out infinite; }
@keyframes taTalk { 0%, 100% { transform: scaleY(1); } 50% { transform: scaleY(2.1); } }
.ta.is-speaking .ta-wave, .ta.is-listening .ta-wave {
  stroke: #22d3ee; animation: taWave 1.5s ease-out infinite;
}
.ta.is-listening .ta-wave { stroke: #34d399; }
@keyframes taWave { 0% { r: 52; opacity: 0.75; } 100% { r: 68; opacity: 0; } }
.ta::after {
  content: ''; position: absolute; inset: -0.5rem; border-radius: 50%;
  box-shadow: 0 0 2.4rem rgba(59, 130, 246, 0.55); opacity: 0; transition: opacity 0.3s;
}
.ta.is-speaking::after, .ta.is-listening::after { opacity: 1; }
.ta.is-listening::after { box-shadow: 0 0 2.4rem rgba(52, 211, 153, 0.6); }

.ta-name { font-size: 0.96rem; font-weight: 700; }
.ta-state { font-size: 0.76rem; color: var(--cyan); }

.mic {
  width: 100%; padding: 0.7rem; border-radius: 0.95rem;
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line2); color: var(--tx);
  font-size: 0.86rem; font-weight: 600;
  transition: background 0.16s, box-shadow 0.16s;
}
.mic i { font-style: normal; font-size: 1.05rem; }
.mic:hover:not(:disabled) { background: rgba(59, 130, 246, 0.11); }
.mic.live {
  background: linear-gradient(135deg, #34d399, #22d3ee); color: #04211b; border-color: transparent;
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6); animation: micPulse 1.3s infinite;
}
@keyframes micPulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  70% { box-shadow: 0 0 0 0.7rem rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
.mic-hint { font-size: 0.72rem; color: var(--tx3); text-align: center; line-height: 1.5; min-height: 2.2em; }

.sw-list { width: 100%; display: flex; flex-direction: column; gap: 0.4rem; margin-top: 0.2rem; }
.sw { display: flex; align-items: center; gap: 0.5rem; font-size: 0.78rem; color: var(--tx2); cursor: pointer; }
.sw input {
  appearance: none; -webkit-appearance: none;
  width: 2.1rem; height: 1.15rem; border-radius: 999px; position: relative;
  background: rgba(59, 130, 246, 0.12); border: 1px solid var(--line2);
  transition: background 0.2s; cursor: pointer; flex: 0 0 auto;
}
.sw input::after {
  content: ''; position: absolute; top: 0.09rem; left: 0.11rem;
  width: 0.85rem; height: 0.85rem; border-radius: 50%; background: #fff;
  transition: transform 0.2s;
}
.sw input:checked { background: var(--grad); border-color: transparent; }
.sw input:checked::after { transform: translateX(0.92rem); }

.stage { padding: 1.05rem 1.15rem; display: flex; flex-direction: column; min-height: 0; }

/* 开始卡片：撑满舞台并垂直居中，大屏上不会缩在左上角 */
.starter { flex: 1 1 auto; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 0.5rem; padding: 1rem 0; }
.starter h2 { margin: 0; font-size: 1.5rem; }
.starter-sub { margin: 0 0 0.8rem; font-size: 0.84rem; color: var(--tx3); }
.starter-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.85rem; width: 100%; max-width: 40rem; }
.big {
  display: flex; flex-direction: column; align-items: center; gap: 0.25rem;
  padding: 1.2rem 0.7rem; border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.65); border: 1px solid var(--line2); color: var(--tx);
  transition: transform 0.18s, border-color 0.18s, background 0.18s;
}
.big i { font-style: normal; font-size: 1.9rem; }
.big b { font-size: 0.94rem; }
.big span { font-size: 0.7rem; color: var(--tx3); }
.big:hover { transform: translateY(-4px); background: rgba(255, 255, 255, 0.9); border-color: rgba(59, 130, 246, 0.5); }

.starter-input, .starter-preview { width: 100%; max-width: 40rem; margin-top: 0.9rem; }
.starter-input textarea {
  width: 100%; padding: 0.8rem 0.95rem; border-radius: 0.9rem; resize: vertical;
  background: rgba(255, 255, 255, 0.72); border: 1px solid var(--line2);
  color: var(--tx); outline: none; font-size: 0.9rem; line-height: 1.6;
}
.starter-input textarea::placeholder { color: var(--tx3); }
.starter-input textarea:focus { border-color: rgba(59, 130, 246, 0.65); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18); }
.starter-row { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.7rem; }
.starter-row .go { margin-left: auto; }
.starter-preview img { max-width: 100%; max-height: 18rem; border-radius: var(--r-md); border: 1px solid var(--line2); margin: 0 auto; }
.preview-row { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.6rem; }
.preview-row .go { margin-left: auto; }

.seg { display: flex; gap: 0.2rem; padding: 0.2rem; border-radius: 0.75rem; background: rgba(59, 130, 246, 0.05); border: 1px solid var(--line); }
.seg button { padding: 0.34rem 0.85rem; border-radius: 0.55rem; font-size: 0.8rem; color: var(--tx2); }
.seg button.on { background: var(--grad); color: #fff; }

.go, .ghost {
  padding: 0.55rem 1.05rem; border-radius: 0.8rem; font-size: 0.86rem; font-weight: 600;
  background: var(--grad); color: #fff; border: 0;
  box-shadow: 0 0.6rem 1.4rem rgba(59, 130, 246, 0.42);
  transition: transform 0.16s, box-shadow 0.16s;
}
.go:hover { transform: translateY(-1px); box-shadow: 0 0.8rem 1.8rem rgba(59, 130, 246, 0.6); }
.ghost {
  background: rgba(59, 130, 246, 0.05); color: var(--tx2); border: 1px solid var(--line2); box-shadow: none;
}
.ghost:hover { color: var(--blue); background: rgba(59, 130, 246, 0.11); }
.ghost.sm { padding: 0.36rem 0.75rem; font-size: 0.76rem; border-radius: 0.6rem; }
.ghost.danger { color: #be123c; border-color: rgba(251, 113, 133, 0.4); }
.ghost.danger:hover { background: rgba(251, 113, 133, 0.12); }

/* 课堂：占满舞台，气泡区自己滚动 */
.classroom { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; }
.cls-bar { display: flex; align-items: center; gap: 0.55rem; padding-bottom: 0.7rem; border-bottom: 1px solid var(--line); }
.lp { flex: 1; height: 0.42rem; border-radius: 999px; background: rgba(59, 130, 246, 0.08); overflow: hidden; min-width: 5rem; }
.lp > i { display: block; height: 100%; width: 4%; border-radius: 999px; background: var(--grad); transition: width 0.6s cubic-bezier(0.2, 0.8, 0.2, 1); }
.lp-text { font-size: 0.76rem; color: var(--tx2); white-space: nowrap; }

.board { margin-top: 0.7rem; border-radius: var(--r-md); background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line); }
.board-head { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.85rem; border-bottom: 1px solid var(--line); font-size: 0.8rem; }
.board-head button { margin-left: auto; }
.board-body { padding: 0.8rem 0.95rem; font-size: 0.9rem; line-height: 1.85; white-space: pre-wrap; overflow-x: auto; }

.chat { flex: 1 1 auto; min-height: 12rem; overflow-y: auto; padding: 0.9rem 0.2rem; display: flex; flex-direction: column; gap: 0.75rem; }
.msg { display: flex; gap: 0.55rem; align-items: flex-start; }
.msg .who {
  flex: 0 0 auto; width: 1.85rem; height: 1.85rem; border-radius: 0.6rem;
  display: grid; place-items: center; font-size: 0.78rem; font-weight: 700;
  background: var(--grad); color: #fff;
}
.msg.student { flex-direction: row-reverse; }
.msg.student .who { background: rgba(59, 130, 246, 0.14); color: var(--tx); }
.bubble {
  max-width: 78%; padding: 0.7rem 0.9rem; border-radius: 1rem;
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line);
  font-size: 0.88rem; line-height: 1.75;
}
.msg.student .bubble { background: rgba(59, 130, 246, 0.2); border-color: rgba(59, 130, 246, 0.4); }
.m-head { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.35rem; }
.m-phase, .m-step, .m-title {
  font-size: 0.66rem; padding: 0.1rem 0.45rem; border-radius: 999px;
  background: rgba(59, 130, 246, 0.09); border: 1px solid var(--line); color: var(--tx2);
}
.m-step { background: rgba(245, 181, 68, 0.14); color: #b45309; border-color: rgba(245, 181, 68, 0.32); }
.m-say { white-space: pre-wrap; }
.m-board {
  margin-top: 0.55rem; padding: 0.55rem 0.7rem; border-radius: 0.7rem;
  background: rgba(59, 130, 246, 0.07); border-left: 2px solid rgba(34, 211, 238, 0.7);
  font-size: 0.86rem; line-height: 1.8; overflow-x: auto;
}
.msg.thinking .bubble { display: flex; align-items: center; gap: 0.55rem; color: var(--tx3); font-size: 0.82rem; }
.msg.thinking em { font-style: normal; }
.dots { display: inline-flex; gap: 0.18rem; }
.dots i { width: 0.36rem; height: 0.36rem; border-radius: 50%; background: var(--cyan); animation: dotB 1.1s infinite; }
.dots i:nth-child(2) { animation-delay: 0.16s; }
.dots i:nth-child(3) { animation-delay: 0.32s; }
@keyframes dotB { 0%, 60%, 100% { opacity: 0.28; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }

.notice {
  align-self: center; max-width: 90%; padding: 0.4rem 0.85rem; border-radius: 999px;
  font-size: 0.74rem; color: var(--tx2);
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
}
.notice.bad { color: #be123c; background: rgba(251, 113, 133, 0.1); border-color: rgba(251, 113, 133, 0.28); }
.notice.good { color: #047857; background: rgba(52, 211, 153, 0.1); border-color: rgba(52, 211, 153, 0.28); }

.answer { border-top: 1px solid var(--line); padding-top: 0.7rem; }
.ans-q { margin: 0 0 0.55rem; font-size: 0.9rem; }
.ans-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.ans-row input {
  flex: 1; min-width: 10rem; padding: 0.55rem 0.85rem; border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.72); border: 1px solid var(--line2); color: var(--tx); outline: none;
}
.ans-row input:focus { border-color: rgba(59, 130, 246, 0.65); }
.opt {
  padding: 0.5rem 1rem; border-radius: 0.75rem; font-size: 0.86rem;
  background: rgba(59, 130, 246, 0.06); border: 1px solid var(--line2); color: var(--tx);
}
.opt:hover { background: rgba(59, 130, 246, 0.22); border-color: rgba(59, 130, 246, 0.6); }
.ans-tips { display: flex; gap: 0.45rem; margin-top: 0.55rem; flex-wrap: wrap; }

.mini-report { margin-top: 0.8rem; padding: 0.9rem 1.05rem; border-radius: var(--r-md); background: rgba(52, 211, 153, 0.1); border: 1px solid rgba(52, 211, 153, 0.3); }
.mini-report h3 { margin: 0 0 0.6rem; font-size: 0.95rem; }
.mr-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.6rem; margin-bottom: 0.5rem; }
.mr-item { text-align: center; }
.mr-item b { display: block; font-size: 1.3rem; font-variant-numeric: tabular-nums; }
.mr-item span { font-size: 0.7rem; color: var(--tx3); }
.mini-report .dim { color: var(--tx2); }

/* ══════════════════ AI 精准学 ══════════════════ */
.precise-top { display: grid; grid-template-columns: 1.4fr 1fr; gap: 1rem; }
.cluster-list { display: flex; flex-direction: column; gap: 0.6rem; }
.cl-row { display: grid; grid-template-columns: 7.5rem 1fr 3.4rem; align-items: center; gap: 0.7rem; font-size: 0.84rem; }
.cl-row .cn { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cl-row .cv { text-align: right; font-size: 0.78rem; color: var(--tx3); font-variant-numeric: tabular-nums; }

.kpi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.kpi {
  padding: 0.85rem 0.95rem; border-radius: var(--r-md);
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
}
.kpi b { display: block; font-size: 1.45rem; line-height: 1.15; font-variant-numeric: tabular-nums; }
.kpi span { font-size: 0.72rem; color: var(--tx3); }
.kpi.good b { color: #047857; }
.kpi.warn b { color: #b45309; }

.plan-hero { padding: 1.1rem 1.25rem; }
.ph-top { display: flex; align-items: baseline; gap: 0.7rem; margin-bottom: 0.6rem; flex-wrap: wrap; }
.ph-top b { font-size: 1.9rem; font-variant-numeric: tabular-nums; }
.ph-top span { font-size: 0.8rem; color: var(--tx2); }

.plan-days { display: grid; grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr)); gap: 0.8rem; }
.day-card {
  padding: 0.85rem 1rem; border-radius: var(--r-lg);
  background: linear-gradient(158deg, var(--glass-a), var(--glass-b) 60%);
  border: 1px solid var(--line);
  box-shadow: 0 0.9rem 2rem rgba(15, 23, 42, 0.1);
}
.day-card.today { border-color: rgba(59, 130, 246, 0.65); box-shadow: 0 0.9rem 2.2rem rgba(59, 130, 246, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.85); }
.day-head { display: flex; align-items: center; gap: 0.45rem; flex-wrap: wrap; margin-bottom: 0.55rem; font-size: 0.82rem; }
.day-head b { font-size: 0.9rem; }
.day-head .d { font-size: 0.72rem; color: var(--tx3); }
.today-tag { font-size: 0.62rem; padding: 0.08rem 0.45rem; border-radius: 999px; background: var(--grad); color: #fff; }
.tasks { display: flex; flex-direction: column; gap: 0.4rem; }
.task {
  display: grid; grid-template-columns: 1.5rem 1fr auto auto; align-items: center; gap: 0.5rem;
  padding: 0.45rem 0.6rem; border-radius: 0.7rem;
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
  font-size: 0.8rem;
}
.task.done { opacity: 0.55; }
.task.done .tn { text-decoration: line-through; }
.ck {
  width: 1.4rem; height: 1.4rem; border-radius: 50%;
  display: grid; place-items: center; font-size: 0.72rem; color: var(--tx3);
  background: rgba(59, 130, 246, 0.07); border: 1px solid var(--line2);
}
.task.done .ck { background: var(--grad-good); color: #04211b; border-color: transparent; }
.tf { font-size: 0.68rem; padding: 0.06rem 0.4rem; border-radius: 999px; background: rgba(59, 130, 246, 0.07); color: var(--tx3); }
.tm { font-size: 0.7rem; color: var(--tx3); }

/* ══════════════════ 培优 / 竞赛 ══════════════════ */
.tier-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); gap: 0.9rem; }
.tier {
  padding: 1.05rem 1.15rem; display: flex; flex-direction: column; gap: 0.4rem;
  text-align: left;
}
.tier-top { display: flex; align-items: center; gap: 0.55rem; }
.tier-ic { width: 2.5rem; height: 2.5rem; object-fit: contain; border-radius: 50%; padding: 0.25rem; background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(147, 197, 253, 0.14)); filter: drop-shadow(0 0.4rem 0.7rem rgba(59, 130, 246, 0.12)); }
.tier b { font-size: 0.96rem; }
.tier p { margin: 0; font-size: 0.78rem; color: var(--tx3); line-height: 1.6; flex: 1; }
.tier .tags { display: flex; gap: 0.35rem; flex-wrap: wrap; }

.kp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr)); gap: 0.7rem; }
.kp { padding: 0.75rem 0.9rem; border-radius: var(--r-md); background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line); }
.kp .kn { font-size: 0.86rem; font-weight: 600; margin-bottom: 0.3rem; }
.kp .km { display: flex; gap: 0.35rem; flex-wrap: wrap; font-size: 0.68rem; color: var(--tx3); }
.stars { color: #f59e0b; letter-spacing: 0.05em; }

/* ══════════════════ 王牌练习 ══════════════════ */
.pk-head, .wr-head {
  display: flex; align-items: center; gap: 1rem; padding: 1.05rem 1.25rem;
}
.pk-ic { width: 3.4rem; height: 3.4rem; object-fit: contain; border-radius: 50%; padding: 0.35rem; background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(147, 197, 253, 0.14)); filter: drop-shadow(0 0.5rem 0.9rem rgba(59, 130, 246, 0.12)); }
.pk-txt { flex: 1; }
.pk-txt b { display: block; font-size: 1.15rem; margin-bottom: 0.2rem; }
.pk-txt span { font-size: 0.78rem; color: var(--tx3); }
.pk-stat { text-align: center; }
.pk-stat b { display: block; font-size: 1.9rem; font-variant-numeric: tabular-nums; }
.pk-stat span { font-size: 0.7rem; color: var(--tx3); }

.pk-list { display: flex; flex-direction: column; gap: 0.7rem; }
.pk-row {
  display: grid; grid-template-columns: 1fr 8rem 5rem 4.5rem auto; align-items: center; gap: 0.8rem;
  padding: 0.8rem 1.05rem; border-radius: var(--r-lg);
  background: linear-gradient(158deg, var(--glass-a), var(--glass-b) 60%);
  border: 1px solid var(--line);
  box-shadow: 0 0.8rem 1.8rem rgba(15, 23, 42, 0.09);
}
.pk-row .pn { font-size: 0.9rem; font-weight: 600; }
.pk-row .pc { font-size: 0.7rem; color: var(--tx3); }
.pk-empty { padding: 2rem; text-align: center; color: var(--tx3); font-size: 0.86rem; line-height: 1.8; }

/* ══════════════════ 试卷中心 ══════════════════ */
.paper-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr)); gap: 0.9rem; }
.paper { padding: 1.15rem 1.25rem; display: flex; flex-direction: column; gap: 0.5rem; justify-content: space-between; min-height: 11rem; }
.paper .pp-top { display: flex; align-items: center; gap: 0.5rem; }
.paper b { font-size: 0.95rem; line-height: 1.4; }
.paper .pp-meta { display: flex; gap: 0.6rem; flex-wrap: wrap; font-size: 0.72rem; color: var(--tx3); }
.paper .pp-foot { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.25rem; }
.paper .pp-foot .btn { margin-left: auto; }

/* ══════════════════ 错题本 ══════════════════ */
.wr-stats { display: flex; gap: 1.4rem; }
.wr-stats div { text-align: center; }
.wr-stats b { display: block; font-size: 1.6rem; font-variant-numeric: tabular-nums; }
.wr-stats span { font-size: 0.7rem; color: var(--tx3); }
.wr-list { display: flex; flex-direction: column; gap: 0.7rem; }
.wr-row {
  padding: 0.9rem 1.1rem; border-radius: var(--r-lg);
  background: linear-gradient(158deg, rgba(251, 113, 133, 0.08), rgba(59, 130, 246, 0.03) 60%);
  border: 1px solid rgba(251, 113, 133, 0.22);
  box-shadow: 0 0.8rem 1.8rem rgba(15, 23, 42, 0.09);
}
.wr-row .wq { font-size: 0.92rem; font-weight: 600; margin-bottom: 0.35rem; }
.wr-row .wm { display: flex; gap: 0.5rem; flex-wrap: wrap; font-size: 0.72rem; color: var(--tx3); margin-bottom: 0.6rem; }
.wr-row .wa { display: flex; gap: 0.45rem; flex-wrap: wrap; }

/* ══════════════════ 记忆曲线复习带（S2） ══════════════════ */
.rv-band { display: flex; flex-direction: column; gap: 0.7rem; margin-bottom: 0.9rem; }
.rv-head { display: flex; align-items: baseline; gap: 0.8rem; justify-content: space-between; padding: 0.1rem 0.2rem; }
.rv-head b { font-size: 0.95rem; color: var(--tx); }
.rv-card { padding: 0.95rem 1.1rem; border-radius: var(--r-lg); }
.rv-card .rv-top { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.45rem; }
.rv-card .rv-stem { font-size: 0.92rem; font-weight: 600; line-height: 1.5; margin-bottom: 0.5rem; }
.rv-card .rv-opts { display: flex; gap: 0.9rem; flex-wrap: wrap; font-size: 0.8rem; color: var(--tx2); margin-bottom: 0.55rem; }
.rv-card .rv-opt b { color: var(--blue); margin-right: 0.25rem; }
.rv-card .rv-act { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.rv-card .rv-ans { margin-top: 0.5rem; }
.rv-empty {
  padding: 0.9rem 1.1rem; border-radius: var(--r-lg); font-size: 0.78rem; color: var(--tx3);
  background: rgba(59, 130, 246, 0.03); border: 1px dashed var(--line);
}

/* ══════════════════ 提示条 ══════════════════ */
.toast {
  position: fixed; left: 50%; bottom: 9.5rem; transform: translateX(-50%) translateY(1rem);
  z-index: 200; padding: 0.65rem 1.25rem; border-radius: 999px;
  background: rgba(255, 255, 255, 0.92); border: 1px solid var(--line2);
  color: var(--tx); font-size: 0.84rem;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.24s, transform 0.24s;
}
.toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ⚠️ grid 的行在容器被拉伸时默认会一起撑满（align-content:stretch），
   这几个网格必须按内容排，剩余空间留在底部，否则卡片会被拉成一条条高瘦块。 */
.kp-grid, .tier-grid, .paper-grid, .plan-days { align-content: start; }

/* ══════════════════ 适配兜底 ══════════════════ */
/* 窄屏（开发时用普通显示器预览）—— 保证不塌 */
@media (max-width: 1100px) {
  .home-top, .home-mid, .mine-top, .mine-cols, .precise-top { grid-template-columns: 1fr; }
  .tutor-grid { grid-template-columns: 1fr; }
  .tutor-side { position: static; flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .ta { width: 5.5rem; height: 5.5rem; }
  .sw-list { width: auto; flex-direction: row; }
  .dock-btn { width: 4.2rem; }
  .dock-btn img { width: 2.1rem; height: 2.1rem; }
  .main { padding-bottom: 6.6rem; }
  .pk-row { grid-template-columns: 1fr auto; row-gap: 0.4rem; }
  .chat { max-height: 40vh; }
}

@media (max-width: 640px) {
  .topnav { overflow-x: auto; }
  .nav-btn { padding: 0.4rem 0.65rem; font-size: 0.78rem; }
  .hero { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.6rem; }
  .starter-actions { grid-template-columns: 1fr; }
  .toast { bottom: 8rem; }
}

/* 学习机横屏（≥1600px）：底栏图标再放大一点，触控更准 */
@media (min-width: 1600px) {
  .dock { gap: 0.6rem; padding: 0.6rem 0.9rem; }
  .dock-btn { width: 6rem; }
  .dock-btn img { width: 3rem; height: 3rem; }
}

/* ══════════════════════════════════════════════════════════════
   D1 深空主题首页（2026-09-17 马总定稿）：
   顶栏 = 左 logo · 中 7 导航 · 右 状态+头像昵称；
   首页 = 3 大版块（领航卡 / 今日航线 / 我的星图），大色块 + C4D 图少文字；
   dock = 上 C4D 图标下文字；图标原图含背景存 assets/c4d/，人工抠图后替换
   ══════════════════════════════════════════════════════════════ */
.brand { display: flex; align-items: center; gap: 0.55rem; }
.brand-logo {
  width: 2.2rem; height: 2.2rem; border-radius: 0.7rem; display: grid; place-items: center;
  font-size: 1.15rem; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, #ff8a3d, #f25e6e);
  box-shadow: 0 0.4rem 1rem rgba(242, 94, 110, 0.4);
}
.brand-txt b { display: block; font-size: 0.98rem; line-height: 1.2; }
.brand-txt span { font-size: 0.64rem; color: var(--tx3); letter-spacing: 0.18em; }
.who-me {
  display: flex; align-items: center; gap: 0.55rem;
  padding-left: 0.75rem; border-left: 1px solid var(--line);
}
.who-me .who-meta { margin-top: 0.15rem; }

/* ───────── 首页 3 大版块 ───────── */
.home3 {
  flex: 1 1 auto; min-height: 0;
  display: grid; grid-template-columns: 33rem 1fr;
  grid-template-rows: minmax(13.5rem, auto) 1fr; gap: 1rem;
}
.hero-new { grid-row: 1 / span 2; display: flex; flex-direction: column; gap: 0.95rem; padding: 1.35rem; position: relative; overflow: hidden; }
.hero-new::after {
  content: ''; position: absolute; right: -4.5rem; top: -4.5rem; width: 17rem; height: 17rem;
  border-radius: 50%; background: radial-gradient(circle, rgba(139, 92, 246, 0.3), transparent 70%);
  pointer-events: none;
}
.hn-top { display: flex; align-items: center; gap: 1.05rem; position: relative; z-index: 1; }
.hn-ava {
  width: 8.6rem; height: 8.6rem; border-radius: 1.5rem; object-fit: cover;
  border: 1px solid var(--line2); box-shadow: 0 1rem 2.2rem rgba(15, 23, 42, 0.12);
}
.hn-hello { min-width: 0; display: flex; flex-direction: column; gap: 0.32rem; }
.hn-hello b { font-size: 1.5rem; line-height: 1.25; }
.hn-hello span { color: var(--tx2); font-size: 0.84rem; }
.hn-line { display: flex; gap: 0.4rem; flex-wrap: wrap; position: relative; z-index: 1; }
.hn-prog { position: relative; z-index: 1; }
.hn-prog-head { display: flex; justify-content: space-between; align-items: baseline; font-size: 0.8rem; color: var(--tx2); }
.hn-prog-head b { font-size: 1.3rem; color: #047857; font-variant-numeric: tabular-nums; }
.hn-bar { height: 0.55rem; border-radius: 0.3rem; background: rgba(59, 130, 246, 0.10); overflow: hidden; margin-top: 0.4rem; }
.hn-bar i { display: block; height: 100%; border-radius: 0.3rem; background: linear-gradient(90deg, #34d399, #22d3ee); transition: width 0.6s; }
.hn-minis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; position: relative; z-index: 1; }
.hn-minis > div {
  background: rgba(59, 130, 246, 0.045); border: 1px solid var(--line);
  border-radius: 0.9rem; padding: 0.62rem 0.72rem;
}
.hn-minis b { display: block; font-size: 1.28rem; font-variant-numeric: tabular-nums; }
.hn-minis span { font-size: 0.7rem; color: var(--tx3); }
.hero-new .hero-btns { margin-top: auto; position: relative; z-index: 1; }

.route { padding: 1.1rem 1.2rem; display: flex; flex-direction: column; gap: 0.85rem; }
.route-tiles { flex: 1 1 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.9rem; }
.rt {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.45rem;
  padding: 0.9rem; border-radius: 1.2rem;
  background: rgba(59, 130, 246, 0.04); border: 1px solid var(--line);
  transition: transform 0.18s, background 0.18s;
}
.rt:hover { transform: translateY(-3px); background: rgba(59, 130, 246, 0.08); }
.rt img {
  width: 5.6rem; height: 5.6rem; object-fit: contain; border-radius: 50%;
  padding: 0.55rem;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.10), rgba(147, 197, 253, 0.18));
  border: 1px solid var(--line); box-shadow: 0 0.5rem 1rem rgba(59, 130, 246, 0.12);
  filter: brightness(1.12) saturate(1.05);
  transition: transform 0.18s;
}
.rt:hover img { transform: scale(1.06) rotate(-2deg); }
.rt b { font-size: 1rem; }
.rt span { font-size: 0.74rem; color: var(--tx3); }

/* ───────── 我的星图（深空知识星座：深色星空卡 + 发光星体 + 掌握度环） ───────── */
.starmap {
  padding: 1.1rem 1.2rem 0.9rem; display: flex; flex-direction: column; gap: 0.5rem; min-height: 0;
  background: radial-gradient(130% 150% at 50% -12%, #1c2c60 0%, #0d1737 46%, #070e24 100%);
  border: 1px solid rgba(120, 160, 255, 0.2);
  box-shadow: 0 1.2rem 2.6rem rgba(6, 12, 34, 0.42), inset 0 1px 0 rgba(255, 255, 255, 0.07);
  overflow: hidden;
}
.starmap.glass {
  background: radial-gradient(130% 150% at 50% -12%, #1c2c60 0%, #0d1737 46%, #070e24 100%);
  backdrop-filter: none; -webkit-backdrop-filter: none;
  border-color: rgba(120, 160, 255, 0.2);
}
.starmap .card-head h3 { color: #eaf2ff; }
.starmap .card-head #starMeta { margin-left: auto; color: #8ba3d6; }
.star-wrap { flex: 1 1 auto; min-height: 180px; position: relative; border-radius: 0.85rem; overflow: hidden; }
.star-svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.star-svg .st-node { cursor: pointer; }
.star-svg .st-node:hover { filter: brightness(1.5) drop-shadow(0 0 4px rgba(190, 220, 255, 0.9)); }
.star-legend { display: flex; gap: 1.3rem; font-size: 0.76rem; color: #93a9d8; }
.star-legend .lg { display: inline-block; width: 0.6rem; height: 0.6rem; border-radius: 50%; margin-right: 0.32rem; }
.lg.g { background: #3ee6a8; } .lg.a { background: #ffcb45; } .lg.r { background: #ff7a9c; } .lg.i { background: #6288d8; }
.star-expand {
  margin-left: 0.55rem; width: 1.7rem; height: 1.7rem; flex: 0 0 auto;
  border-radius: 0.5rem; border: 1px solid rgba(140, 175, 240, 0.35);
  background: rgba(120, 160, 255, 0.12); color: #cfe0ff; font-size: 0.9rem; line-height: 1; cursor: pointer;
  transition: background 0.16s, transform 0.16s;
}
.star-expand:hover { background: rgba(120, 160, 255, 0.26); transform: translateY(-1px); }

/* ───────── 全屏知识星图 ───────── */
.star-full {
  position: fixed; inset: 0; z-index: 90; display: grid; place-items: center;
  background: rgba(4, 8, 22, 0.74);
  backdrop-filter: blur(9px); -webkit-backdrop-filter: blur(9px);
  animation: sfIn 0.22s ease;
}
@keyframes sfIn { from { opacity: 0; } to { opacity: 1; } }
.sf-panel {
  width: min(94vw, 76rem); display: flex; flex-direction: column; gap: 0.7rem;
  padding: 1.1rem 1.3rem 1rem; border-radius: 1.4rem;
  background: radial-gradient(120% 150% at 50% 0%, #16244f 0%, #0a132f 55%, #050b1e 100%);
  border: 1px solid rgba(130, 170, 255, 0.22);
  box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.55);
}
.sf-head { display: flex; align-items: center; gap: 1rem; }
.sf-head h3 { margin: 0; font-size: 1.12rem; color: #eaf2ff; }
.sf-legend { display: flex; gap: 1.1rem; font-size: 0.8rem; color: #9db3e0; margin-left: auto; flex-wrap: wrap; }
.sf-legend .lg { display: inline-block; width: 0.6rem; height: 0.6rem; border-radius: 50%; margin-right: 0.3rem; }
.sf-close {
  width: 2.1rem; height: 2.1rem; flex: 0 0 auto; border-radius: 0.7rem;
  border: 1px solid rgba(140, 175, 240, 0.3); background: rgba(120, 160, 255, 0.12);
  color: #cfe0ff; font-size: 1rem; cursor: pointer;
}
.sf-close:hover { background: rgba(120, 160, 255, 0.26); }
.sf-body {
  position: relative; width: 100%; aspect-ratio: 1000 / 620; max-height: 68vh;
  border-radius: 1rem; overflow: hidden;
}
.sf-body .star-svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.sf-tip { margin: 0; text-align: center; font-size: 0.78rem; color: #7f96c4; }

/* ───────── 星图视图模式切换（星座视图 / 3D 星域） ───────── */
.sf-modes {
  display: inline-flex; gap: 0.2rem; padding: 0.18rem; margin-left: 0.35rem;
  border-radius: 0.62rem; background: rgba(120, 160, 255, 0.1);
  border: 1px solid rgba(140, 175, 240, 0.22);
}
.sf-mode {
  padding: 0.3rem 0.78rem; border: 0; border-radius: 0.48rem; cursor: pointer;
  background: transparent; color: #9fb6e2; font-size: 0.78rem; font-weight: 600;
  transition: background 0.16s ease, color 0.16s ease;
}
.sf-mode:hover { color: #d6e4ff; }
.sf-mode.on {
  background: linear-gradient(180deg, #3d6ee0, #2a4fb8); color: #fff;
  box-shadow: 0 0.25rem 0.7rem rgba(56, 108, 224, 0.45);
}

/* ───────── 3D 知识星域舞台（three.js canvas + 悬浮标签层） ───────── */
.sf-body.is3d {
  background:
    radial-gradient(38rem 26rem at 22% 34%, rgba(86, 126, 240, 0.3), transparent 68%),
    radial-gradient(34rem 24rem at 78% 62%, rgba(139, 92, 246, 0.22), transparent 68%),
    radial-gradient(26rem 18rem at 52% 94%, rgba(62, 230, 168, 0.1), transparent 70%),
    radial-gradient(120% 130% at 50% 34%, #16265a 0%, #0a1330 52%, #04081a 100%);
}
.s3-canvas {
  position: absolute; inset: 0; display: block;
  width: 100% !important; height: 100% !important;
  cursor: grab; touch-action: none;
}
.s3-canvas.grabbing { cursor: grabbing; }
.s3-labels { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.s3-lb {
  position: absolute; top: 0; left: 0; text-align: center; white-space: nowrap;
  will-change: transform, opacity; transition: opacity 0.18s linear;
}
.s3-lb b {
  display: block; font-size: 0.66rem; font-weight: 600;
  color: #cfe0ff; text-shadow: 0 0 6px rgba(4, 10, 26, 0.95), 0 0 2px rgba(4, 10, 26, 1);
}
.s3-lb i {
  display: block; font-style: normal; font-size: 0.56rem; margin-top: 0.08rem;
  color: #8ba7dd; text-shadow: 0 0 5px rgba(4, 10, 26, 0.95);
}
.s3-lb.ch b {
  font-size: 0.84rem; font-weight: 800; color: #fff;
  text-shadow: 0 0 9px rgba(4, 10, 26, 0.98), 0 0 3px rgba(4, 10, 26, 1), 0 0 18px rgba(90, 140, 255, 0.5);
}
.s3-lb.ch i { font-size: 0.64rem; color: #a9c3f0; }
.s3-lb.sb b { font-size: 0.6rem; }
.s3-lb.sb i { font-size: 0.5rem; }
.s3-lb.pt b { font-size: 0.58rem; font-weight: 500; color: #9fd8ff; }
.s3-lb.pt i { font-size: 0.5rem; color: #6f8cc0; }
.s3-lb.core b {
  font-size: 0.92rem; font-weight: 800; letter-spacing: 0.06em; color: #ffe9a8;
  text-shadow: 0 0 10px rgba(4, 10, 26, 0.98), 0 0 3px rgba(4, 10, 26, 1), 0 0 20px rgba(255, 200, 90, 0.65);
}
.s3-lb.rec b { color: #ffe6a4; }
.s3-lb u {
  display: inline-block; margin-top: 0.16rem; padding: 0.04rem 0.36rem;
  border-radius: 0.5rem; background: #ffd873; color: #5a3b00;
  font-size: 0.52rem; font-weight: 800; text-decoration: none;
  box-shadow: 0 0 0.5rem rgba(255, 216, 115, 0.6);
}
@media (max-width: 760px) {
  .sf-head { flex-wrap: wrap; }
  .sf-modes { order: 9; margin-left: 0; }
  .s3-lb b { font-size: 0.6rem; }
  .s3-lb.ch b { font-size: 0.74rem; }
}

/* ───────── 作业辅导 ───────── */
.hw-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; align-content: start; }
.hw {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 0.6rem;
  padding: 1.6rem 1.2rem; border-radius: 1.4rem;
  transition: transform 0.18s, background 0.18s;
}
.hw:hover { transform: translateY(-4px); background: rgba(59, 130, 246, 0.08); }
.hw img { width: 8.5rem; height: 8.5rem; object-fit: contain; border-radius: 1.6rem; padding: 0.6rem; background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(147, 197, 253, 0.14)); border: 1px solid var(--line); box-shadow: 0 0.6rem 1.2rem rgba(59, 130, 246, 0.1); filter: brightness(1.1) saturate(1.05); }
.hw b { font-size: 1.08rem; }
.hw span { font-size: 0.8rem; color: var(--tx2); line-height: 1.55; }
.hw-note { padding: 1rem 1.3rem; font-size: 0.82rem; color: var(--tx2); line-height: 1.7; }
.hw-note b { color: var(--tx); }
.hw-steps { flex: 1 1 auto; min-height: 0; display: grid; grid-template-columns: repeat(3, 1fr); grid-auto-rows: 1fr; gap: 1rem; }
.hws {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.5rem;
  border-radius: 1.3rem; padding: 1rem; text-align: center;
}
.hws b {
  width: 2.3rem; height: 2.3rem; border-radius: 50%; display: grid; place-items: center;
  font-size: 1.05rem; color: #fff; background: var(--grad);
  box-shadow: 0 0.4rem 1rem rgba(59, 130, 246, 0.4);
}
.hws span { font-size: 1.02rem; font-weight: 600; }
.hws i { font-style: normal; font-size: 0.8rem; color: var(--tx2); }

/* ───────── dock C4D 图标：新图标已带透明底，直接显示，轻阴影提层次 ───────── */
.dock-btn img { filter: drop-shadow(0 0.35rem 0.6rem rgba(59, 130, 246, 0.18)); }

/* ───────── 顶栏右侧用户徽章（横排胶囊：左头像+橙角标·右昵称/年级两行） ───────── */
.user-chip {
  display: flex; align-items: center; gap: 0.55rem;
  padding: 0.26rem 0.9rem 0.26rem 0.28rem;
  border-radius: 2rem;
  background: linear-gradient(168deg, rgba(255, 255, 255, 0.78), rgba(235, 245, 255, 0.62));
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: transform 0.18s, border-color 0.18s;
}
.user-chip:hover { transform: translateY(-1px); border-color: var(--line2); }
.up-ava-wrap { position: relative; width: 2.5rem; height: 2.5rem; flex: none; }
.up-ava-wrap img {
  width: 100%; height: 100%; border-radius: 50%; object-fit: cover;
  object-position: 50% 22%;
  border: 2px solid rgba(255, 255, 255, 0.75);
  box-shadow: 0 0 0.6rem rgba(59, 130, 246, 0.32), 0 0.3rem 0.7rem rgba(15, 23, 42, 0.08);
}
.up-badge {
  position: absolute; left: -0.25rem; bottom: -0.12rem;
  width: 1.05rem; height: 1.05rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.62rem; font-style: normal; color: #fff;
  background: linear-gradient(150deg, #ff8a3d, #ff5f6d);
  border: 1.5px solid rgba(11, 16, 38, 0.9);
  box-shadow: 0 0.15rem 0.4rem rgba(15, 23, 42, 0.12);
}
.up-txt { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.3; }
.up-txt b { font-size: 0.8rem; color: var(--tx); max-width: 6.5rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.up-txt i { font-style: normal; font-size: 0.7rem; font-weight: 600; color: var(--blue); }

/* ───────── 右缘悬浮用户徽章（竖排胶囊，保留） ───────── */
.user-pill {
  position: fixed; right: 0.85rem; top: 50%; transform: translateY(-50%);
  z-index: 45;
  display: flex; flex-direction: column; align-items: center; gap: 0.45rem;
  width: 3.6rem; padding: 0.55rem 0.3rem 0.7rem;
  border-radius: 2rem;
  background: linear-gradient(168deg, rgba(255, 255, 255, 0.78), rgba(235, 245, 255, 0.62));
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: transform 0.18s, border-color 0.18s;
}
.user-pill:hover { transform: translateY(-50%) scale(1.04); border-color: var(--line2); }
.user-pill b { font-size: 0.72rem; color: var(--tx); max-width: 3.1rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-align: center; }
.user-pill .up-grade {
  writing-mode: vertical-rl; letter-spacing: 0.22em;
  font-size: 0.68rem; font-weight: 600;
  padding: 0.35rem 0.28rem; border-radius: 0.55rem;
  background: rgba(59, 130, 246, 0.10);
  border: 1px solid var(--line2);
  color: var(--blue);
}
.rt img, .hw img { filter: brightness(1.12) saturate(1.05); }