/* xskySite 全站样式 —— 骨架统一、主题换皮：
   默认主题=方向 A「晨昼智能 · 轻盈极光」（门户/小天页，token 与 xskyIos Theme.swift 同源）；
   html[data-product="study"]=天学页 Pop 换皮（token 与 skystudyIos App/Theme.swift 同源），见文件尾。
   色值均一比一提取勿凭感觉改；浅色优先、深色跟随系统；移动优先；动效尊重 prefers-reduced-motion。 */

/* ---------- 设计 token（Theme.swift 同源） ---------- */
:root {
  --bg: #F7F7F4;            /* 页面底：晨雾米白 */
  --ink: #1C1C21;           /* 主文字 */
  --secondary: #8A8A93;     /* 次要文字 */
  --card: #FFFFFF;          /* 卡面 */
  --border: #E7E7E2;        /* 极细描边 */
  --user-bubble: #E9EEFA;   /* 用户气泡淡蓝 */
  --accent: #7A5AF8;        /* 极光紫：主操作 */
  --gold-spark: #F0A868;    /* 暖金火花：星光点缀 */
  --aurora-blue: #6FA8FF;   /* 极光三停色（蓝→紫→暖金） */
  --aurora-purple: #A78BFA;
  --aurora-gold: #F0B97D;
  --mem-preference: #8E7CC3; /* 记忆类型点：偏好淡紫 */
  --mem-fact: #5E86B0;       /* 事实雾蓝 */
  --mem-event: #5AA588;      /* 事件黛绿 */
  --mem-person: #C0904E;     /* 人物暖褐 */
  --shadow: 0 1px 2px rgba(28, 28, 33, .04), 0 8px 24px rgba(28, 28, 33, .06);
  /* 天学品牌色（门户产品卡等「非 study 作用域」处引用；与 study 主题 token 同源） */
  --skystudy-accent: #FF6B4A;
  --skystudy-band: linear-gradient(100deg, #FF6B4A, #FFB020);
}
/* 深色 token：媒体查询与 data-theme 双轨(两处内容保持一致,改一处必改另一处)。
   data-theme 由 site.js 读 URL ?theme= 设置——供截图验收/调试强制主题,生产访客走系统偏好。 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101014;          /* 夜墨 */
    --ink: #ECECF1;
    --secondary: #8E8E96;
    --card: #1B1B21;
    --border: #2A2A32;
    --user-bubble: #26304C;
    --mem-preference: #B4A5E0;
    --mem-fact: #8FB0D8;
    --mem-event: #8FCBB4;
    --mem-person: #D8B27E;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
    --skystudy-accent: #FF7D5C; /* coral 深底提亮一档 */
    --skystudy-band: linear-gradient(100deg, #FF7D5C, #FFBC45);
  }
}
:root[data-theme="dark"] {
  --bg: #101014;
  --ink: #ECECF1;
  --secondary: #8E8E96;
  --card: #1B1B21;
  --border: #2A2A32;
  --user-bubble: #26304C;
  --mem-preference: #B4A5E0;
  --mem-fact: #8FB0D8;
  --mem-event: #8FCBB4;
  --mem-person: #D8B27E;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  --skystudy-accent: #FF7D5C;
  --skystudy-band: linear-gradient(100deg, #FF7D5C, #FFBC45);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 24px; height: 60px; }
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 17px; color: var(--ink);
}
.nav-logo:hover { text-decoration: none; }
.nav-logo .spark { color: var(--accent); }
.nav-links { display: flex; gap: 20px; margin-left: auto; }
.nav-links a { color: var(--secondary); font-size: 15px; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-cta {
  background: var(--ink); color: var(--bg);
  padding: 7px 16px; border-radius: 999px; font-size: 14px; font-weight: 600;
}
.nav-cta:hover { text-decoration: none; opacity: .85; }
@media (max-width: 640px) {
  .nav-links { display: none; } /* 移动端只留 logo + CTA，单页滚动无需锚点菜单 */
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 88px 0 72px;
  text-align: center;
}
/* 极光底幕：三团渐变光斑缓慢漂移（纯 CSS，性能友好：只动 transform/opacity） */
.hero-aurora { position: absolute; inset: 0; pointer-events: none; }
.hero-aurora i {
  content: ""; position: absolute; border-radius: 50%;
  filter: blur(72px); opacity: .5; will-change: transform;
}
.hero-aurora i:nth-child(1) {
  width: 480px; height: 480px; left: -120px; top: -140px;
  background: radial-gradient(circle, var(--aurora-blue), transparent 65%);
  animation: drift-a 26s ease-in-out infinite alternate;
}
.hero-aurora i:nth-child(2) {
  width: 520px; height: 520px; right: -140px; top: -80px;
  background: radial-gradient(circle, var(--aurora-purple), transparent 65%);
  animation: drift-b 32s ease-in-out infinite alternate;
}
.hero-aurora i:nth-child(3) {
  width: 420px; height: 420px; left: 50%; bottom: -220px; margin-left: -210px;
  background: radial-gradient(circle, var(--aurora-gold), transparent 65%);
  animation: drift-c 38s ease-in-out infinite alternate;
}
@media (prefers-color-scheme: dark) { .hero-aurora i { opacity: .32; } }
@keyframes drift-a { to { transform: translate(70px, 50px) scale(1.12); } }
@keyframes drift-b { to { transform: translate(-60px, 60px) scale(1.08); } }
@keyframes drift-c { to { transform: translate(40px, -40px) scale(1.15); } }
@media (prefers-reduced-motion: reduce) { .hero-aurora i { animation: none; } }

.hero h1 {
  position: relative;
  font-size: clamp(34px, 6vw, 56px); line-height: 1.25; font-weight: 800;
  letter-spacing: .01em;
}
.hero h1 .aurora-text {
  background: linear-gradient(100deg, var(--aurora-blue), var(--aurora-purple), var(--aurora-gold));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub {
  position: relative;
  margin: 18px auto 0; max-width: 560px;
  font-size: clamp(16px, 2.4vw, 19px); color: var(--secondary);
}
.hero-actions { position: relative; margin-top: 32px; display: flex; gap: 14px; justify-content: center; align-items: center; flex-wrap: wrap; }

/* App Store「即将上架」徽章：置灰 + 角标，不承诺下载 */
.badge-soon {
  display: inline-flex; align-items: center; gap: 10px;
  border: 1px solid var(--border); background: var(--card);
  border-radius: 14px; padding: 10px 18px;
  color: var(--secondary); font-size: 15px; font-weight: 600;
  position: relative;
}
.badge-soon .apple { font-size: 22px; line-height: 1; }
.badge-soon .tag {
  position: absolute; top: -10px; right: -12px;
  background: linear-gradient(100deg, var(--aurora-purple), var(--aurora-gold));
  color: #fff; font-size: 11px; font-weight: 700;
  padding: 2px 8px; border-radius: 999px;
}

/* 手机壳（CSS 壳，F2 截图落位于 .phone-screen img） */
.hero-phone { position: relative; margin: 56px auto 0; width: min(320px, 78vw); }
.phone-shell {
  border-radius: 44px; padding: 12px;
  background: linear-gradient(160deg, #2c2c33, #17171c);
  box-shadow: 0 24px 60px rgba(28, 28, 33, .28);
}
.phone-screen {
  border-radius: 34px; overflow: hidden; background: var(--bg);
  aspect-ratio: 390 / 844;
}
.phone-screen img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- 通用 section ---------- */
.section { padding: 72px 0; }
.section-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.section-head .eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700; letter-spacing: .12em;
  color: var(--accent); text-transform: uppercase;
}
.section-head h2 { font-size: clamp(26px, 4vw, 36px); line-height: 1.3; margin-top: 10px; }
.section-head .desc { margin-top: 12px; color: var(--secondary); font-size: 16px; }

/* 卡片网格 */
.cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 20px; padding: 26px; box-shadow: var(--shadow);
}
.card .icon { font-size: 26px; }
.card h3 { margin-top: 12px; font-size: 19px; }
.card p { margin-top: 8px; color: var(--secondary); font-size: 15px; }

/* 记忆深潜：交替图文行 */
.feature-row {
  display: grid; gap: 32px; align-items: center;
  grid-template-columns: 1fr; margin-top: 40px;
}
@media (min-width: 880px) {
  .feature-row { grid-template-columns: 1fr 1fr; }
  .feature-row.flip .feature-text { order: 2; }
}
.feature-text h3 { font-size: 22px; display: flex; align-items: center; gap: 8px; }
.feature-text p { margin-top: 10px; color: var(--secondary); }
.feature-text .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.feature-visual {
  border: 1px solid var(--border); border-radius: 20px; overflow: hidden;
  background: var(--card); box-shadow: var(--shadow);
}
.feature-visual img { width: 100%; }

/* 隐私承诺清单 */
.promise-list { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.promise {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 18px;
}
.promise .check { color: var(--mem-event); font-weight: 700; }
.promise p { font-size: 14.5px; color: var(--secondary); margin-top: 2px; }
.promise strong { color: var(--ink); font-size: 15px; }

/* 尾部 CTA */
.cta-final {
  text-align: center; padding: 88px 0;
  position: relative; overflow: hidden;
}
.cta-final h2 { font-size: clamp(26px, 4vw, 38px); }
.cta-final .sub { margin-top: 12px; color: var(--secondary); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--border); padding: 36px 0 44px; font-size: 14px; color: var(--secondary); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; justify-content: space-between; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--secondary); }
.footer-links a:hover { color: var(--ink); }
.footer .icp { width: 100%; font-size: 13px; }

/* ---------- 法务/支持内页（克制无动效） ---------- */
.doc-main { max-width: 720px; margin: 0 auto; padding: 48px 20px 80px; }
.doc-main h1 { font-size: 30px; line-height: 1.35; margin-bottom: 8px; }
.doc-main h2 { font-size: 22px; margin: 36px 0 12px; padding-top: 8px; }
.doc-main h3 { font-size: 18px; margin: 26px 0 10px; }
.doc-main p { margin: 12px 0; }
.doc-main ul, .doc-main ol { padding-left: 1.6em; margin: 12px 0; }
.doc-main li { margin: 6px 0; }
.doc-main blockquote {
  border-left: 3px solid var(--aurora-purple);
  background: var(--card); border-radius: 0 12px 12px 0;
  padding: 12px 18px; margin: 16px 0; color: var(--secondary);
}
.doc-main blockquote p { margin: 6px 0; }
.doc-main hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.doc-main table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14.5px; display: block; overflow-x: auto; }
.doc-main th, .doc-main td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.doc-main th { background: var(--card); }
.doc-main .doc-meta { color: var(--secondary); font-size: 14px; margin-bottom: 24px; }

/* ---------- CSS 复刻 App 内组件（记忆 section 的 mock 视觉；与 App 观感同源） ---------- */
.mock-panel {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 20px; padding: 24px; box-shadow: var(--shadow);
  display: grid; gap: 14px; align-content: center; min-height: 240px;
}
.mock-bubble {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 16px; padding: 12px 16px; font-size: 14.5px;
  max-width: 340px; line-height: 1.6;
}
.mock-bubble.user { background: var(--user-bubble); border: none; justify-self: end; }
/* ✨/✦ chip：AI 时刻签名（极光渐变文字，对齐 App SparkLabel） */
.spark-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13.5px; font-weight: 600; width: fit-content;
  background: linear-gradient(100deg, var(--aurora-blue), var(--aurora-purple), var(--aurora-gold));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.recall-chip {
  display: flex; align-items: center; gap: 8px; width: fit-content;
  background: color-mix(in srgb, var(--aurora-gold) 14%, var(--card));
  border-radius: 12px; padding: 9px 14px; font-size: 13.5px;
  color: var(--aurora-gold);
}
@media (prefers-color-scheme: light) {
  .recall-chip { color: #B07E3F; } /* 浅色下暖金加深保证可读性 */
}
/* 记忆详情 mock 卡 */
.mock-mem { display: grid; gap: 10px; }
.mock-mem .text { font-size: 15px; font-weight: 600; }
.mock-mem .meta { display: flex; gap: 8px; align-items: center; font-size: 12.5px; }
.mock-mem .type-tag { padding: 2px 10px; border-radius: 999px; font-weight: 600; }
.mock-mem .hash { color: var(--secondary); }
.mock-mem .ops {
  display: flex; gap: 14px; font-size: 13px; color: var(--secondary);
  border-top: 1px solid var(--border); padding-top: 12px; flex-wrap: wrap;
}
.mock-mem .ops .link { color: var(--accent); }
/* 回顾 mock 卡 */
.mock-review { display: grid; gap: 8px; }
.mock-review .head { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--secondary); }
.mock-review .body { font-size: 14.5px; line-height: 1.65; }

/* 小号手机壳（超能力/内文配图用） */
.phone-sm { width: min(280px, 70vw); margin: 0 auto; }
.phone-sm .phone-shell { border-radius: 38px; padding: 10px; }
.phone-sm .phone-screen { border-radius: 30px; }

/* 语音双卡 */
.voice-cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); max-width: 880px; margin: 0 auto; }
.voice-note {
  margin: 28px auto 0; width: fit-content; max-width: 92%;
  display: flex; gap: 10px; align-items: center;
  border: 1px solid var(--border); border-radius: 999px;
  padding: 10px 20px; font-size: 14px; color: var(--secondary);
  background: var(--card);
}
.voice-note .lock { color: var(--mem-event); }

/* 滚动淡入（site.js 配合；reduce-motion 下直接常显） */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.on { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- 天学页主题（html[data-product="study"]）：Pop 明亮活泼换皮 ----------
   色值一比一对齐 skystudyIos App/Theme.swift Pop 调色板（coral/violet/green/amber）。
   只换色彩 token，组件/栏格/字体/动效全站共享；--aurora-* 三停在此作用域重定义为
   coral→amber 暖调，hero 光斑/渐变文字/徽章角标等引用处自动换肤。
   天学 App v1 锁浅色，深色是官网双轨适配（暖深底+主色提亮保对比度）；
   深色两轨（媒体查询 / data-theme）内容保持一致，改一处必改另一处。 */
html[data-product="study"] {
  --bg: #FBF7F0;             /* Pop.bg 暖米白 */
  --ink: #2B2B33;            /* Pop.ink */
  --secondary: #8A8A94;      /* Pop.inkSoft */
  --card: #FFFFFF;
  --border: #EFE6D9;         /* 暖调细描边（米白系推导） */
  --user-bubble: #FFE9E2;    /* coral 淡底（复刻件用） */
  --accent: #FF6B4A;         /* Pop.coral：主操作/选中 */
  --gold-spark: #FFB020;     /* Pop.amber */
  --aurora-blue: #FF6B4A;    /* 三停重定义：coral→过渡橙→amber */
  --aurora-purple: #FF8A3D;
  --aurora-gold: #FFB020;
  --pop-violet: #7C5CFF;     /* Pop.violet：等级/智识 */
  --pop-green: #2FB47C;      /* Pop.green：完成/正确 */
  --pop-amber: #FFB020;      /* Pop.amber：连胜/落后警示 */
  --mem-preference: #7C5CFF; /* 复用组件（dot/check 等）语义映射 Pop 四色 */
  --mem-fact: #2FB47C;
  --mem-event: #2FB47C;
  --mem-person: #FFB020;
  --shadow: 0 1px 2px rgba(43, 43, 51, .04), 0 8px 24px rgba(43, 43, 51, .08);
}
@media (prefers-color-scheme: dark) {
  html[data-product="study"]:not([data-theme="light"]) {
    --bg: #17130F;           /* 暖夜褐 */
    --ink: #F0ECE4;
    --secondary: #9A948B;
    --card: #211C16;
    --border: #322B22;
    --user-bubble: #3D2A22;
    --accent: #FF7D5C;
    --gold-spark: #FFBC45;
    --aurora-blue: #FF7D5C;
    --aurora-purple: #FF9A55;
    --aurora-gold: #FFBC45;
    --pop-violet: #9B82FF;
    --pop-green: #4CC796;
    --pop-amber: #FFBC45;
    --mem-preference: #9B82FF;
    --mem-fact: #4CC796;
    --mem-event: #4CC796;
    --mem-person: #FFBC45;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  }
}
html[data-product="study"][data-theme="dark"] {
  --bg: #17130F;
  --ink: #F0ECE4;
  --secondary: #9A948B;
  --card: #211C16;
  --border: #322B22;
  --user-bubble: #3D2A22;
  --accent: #FF7D5C;
  --gold-spark: #FFBC45;
  --aurora-blue: #FF7D5C;
  --aurora-purple: #FF9A55;
  --aurora-gold: #FFBC45;
  --pop-violet: #9B82FF;
  --pop-green: #4CC796;
  --pop-amber: #FFBC45;
  --mem-preference: #9B82FF;
  --mem-fact: #4CC796;
  --mem-event: #4CC796;
  --mem-person: #FFBC45;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
}

/* ---------- 门户（index）：双产品卡与家族导航 ---------- */
/* 门户 Hero 无手机壳，底部收紧把视觉焦点让给双卡 */
.hero--portal { padding-bottom: 48px; }
.portal-cards {
  display: grid; gap: 22px; grid-template-columns: 1fr;
  max-width: 920px; margin: 0 auto;
}
@media (min-width: 820px) { .portal-cards { grid-template-columns: 1fr 1fr; } }
a.product-card {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--border); border-radius: 24px;
  box-shadow: var(--shadow); overflow: hidden; color: var(--ink);
  transition: transform .25s ease, box-shadow .25s ease;
}
a.product-card:hover {
  text-decoration: none; transform: translateY(-3px);
  box-shadow: 0 2px 4px rgba(28, 28, 33, .05), 0 16px 36px rgba(28, 28, 33, .12);
}
@media (prefers-reduced-motion: reduce) {
  a.product-card { transition: none; }
  a.product-card:hover { transform: none; }
}
/* 顶饰渐变带：各产品自己的 hero 渐变基因 */
.product-card .band { height: 7px; }
.product-card.xiaotian .band { background: linear-gradient(100deg, var(--aurora-blue), var(--aurora-purple), var(--aurora-gold)); }
.product-card.skystudy .band { background: var(--skystudy-band); }
.product-card .body { padding: 24px 26px 26px; display: flex; flex-direction: column; gap: 13px; flex: 1; }
.product-card .head { display: flex; align-items: center; gap: 10px; }
.product-card .head .mark { font-size: 24px; line-height: 1; }
.product-card .head h3 { font-size: 22px; }
.product-card .head .en { color: var(--secondary); font-size: 13.5px; font-weight: 600; align-self: flex-end; padding-bottom: 3px; }
.product-card .tagline { font-weight: 600; font-size: 15.5px; }
.product-card .points { list-style: none; display: grid; gap: 7px; color: var(--secondary); font-size: 14.5px; }
.product-card .points li { display: flex; gap: 8px; align-items: baseline; }
.product-card .points li::before { content: "✓"; font-weight: 700; color: var(--accent); }
.product-card.skystudy .points li::before { color: var(--skystudy-accent); }
.product-card .more { margin-top: auto; padding-top: 4px; font-weight: 600; font-size: 15px; color: var(--accent); }
.product-card.skystudy .more { color: var(--skystudy-accent); }
/* 门户卡缩略图：半截手机探出卡底（overflow 裁切），聚焦产品第一屏 */
.product-card .card-shot {
  height: 235px; overflow: hidden; margin-top: 10px;
  display: flex; justify-content: center; align-items: flex-start;
}
.product-card .card-shot .phone-shell {
  width: 225px; border-radius: 32px; padding: 8px; flex-shrink: 0;
}
.product-card .card-shot .phone-screen { border-radius: 25px; }
/* 子页导航面包屑（✦ xsky / 小天）与门户导航移动端保留链接（仅 3 个短词，放得下） */
.nav-logo .crumb { color: var(--secondary); font-weight: 600; }
@media (max-width: 640px) {
  .nav--portal .nav-links { display: flex; gap: 14px; font-size: 14px; }
}

/* ---------- 天学页 CSS 复刻组件（App 观感同源：Pop 白卡 + 四色语义） ----------
   与小天页 mock-panel 同一惯例：aria-hidden 装饰、内容对齐 App 真实元素不编造。 */
/* ① 目标→大纲：一句输入 + 拆出的天列表 */
.study-goal-input {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 16px; font-size: 14.5px; font-weight: 600;
}
.study-goal-input .cursor { color: var(--accent); animation: blink 1.2s steps(2) infinite; font-weight: 400; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .study-goal-input .cursor { animation: none; } }
.study-day-list { display: grid; gap: 8px; }
.study-day {
  display: flex; align-items: center; gap: 10px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 10px 14px; font-size: 14px;
}
.study-day .no {
  flex-shrink: 0; width: 44px; text-align: center;
  font-size: 12px; font-weight: 700; border-radius: 999px; padding: 2px 0;
  background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent);
}
.study-day .t { font-weight: 600; }
.study-day .state { margin-left: auto; font-size: 12.5px; color: var(--secondary); }
.study-day .state.done { color: var(--pop-green, #2FB47C); font-weight: 600; }
.study-day.dim { opacity: .62; }
/* ③ 错题本行：题干缩略 + 状态 chip + 回练 */
.study-wrong-list { display: grid; gap: 10px; }
.study-wrong {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 16px; display: grid; gap: 8px; font-size: 14px;
}
.study-wrong .stem { font-weight: 600; }
.study-wrong .row { display: flex; align-items: center; gap: 10px; }
.study-wrong .chip {
  font-size: 11.5px; font-weight: 600; padding: 2px 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent);
}
.study-wrong .chip.again { background: color-mix(in srgb, var(--pop-amber, #FFB020) 16%, transparent); color: color-mix(in srgb, var(--pop-amber, #FFB020) 70%, var(--ink)); }
.study-wrong .redo { margin-left: auto; font-size: 13px; font-weight: 600; color: var(--accent); }
/* ⑤ 节奏行：CSS 进度环 + 落后徽章 + 每日提醒 */
.study-pace { display: grid; gap: 12px; }
.study-pace .row {
  display: flex; align-items: center; gap: 12px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 12px 16px; font-size: 14px;
}
.pop-ring {
  --ring-color: var(--accent); --ring-pct: 34%;
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 50%;
  background: conic-gradient(var(--ring-color) var(--ring-pct), color-mix(in srgb, var(--ring-color) 14%, transparent) 0);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4.5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4.5px));
}
.study-pace .num { font-weight: 700; font-variant-numeric: tabular-nums; }
.study-pace .lag {
  font-size: 11.5px; font-weight: 600; padding: 2px 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--pop-amber, #FFB020) 16%, transparent);
  color: color-mix(in srgb, var(--pop-amber, #FFB020) 70%, var(--ink));
}
.study-pace .bell { margin-left: auto; color: var(--secondary); font-size: 13px; }