/* ============================================================
   design.css — haodong.site 视觉系统 v2
   目标：Apple 官网级别的排版精度、留白节奏与克制动效
   依据：apple.com / apple.com.cn 渲染反推 + Apple HIG
   结构：
     0  字体
     1  设计令牌
     2  基础与复位
     3  排版系统
     4  导航
     5  首屏
     6  章节与页面首屏
     7  卡片系统
     8  按钮与链接
     9  表格与表单
     10 页脚
     11 浮层
     12 图像与氛围
     13 动效
     14 响应式
     15 无障碍
   约束：不改动任何 HTML 结构、文案与链接；chat.html（body.kook-app）只做语气统一
   ============================================================ */

/* ============================================================
   0. 字体
   Inter       → 拉丁字母与数字（Apple SF Pro 的等价替代，可变字重 100–900）
   Noto Sans SC→ 中文（思源黑体同源，等价于 PingFang SC 的设计语言）
   中文分片由 noto.css 以 unicode-range 声明，浏览器按需加载
   ============================================================ */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("fonts/inter-latin-ext-wght-normal.woff2") format("woff2-variations");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("fonts/inter-latin-wght-normal.woff2") format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ============================================================
   1. 设计令牌
   ============================================================ */
:root {
  /* ---- 字体族 ---- */
  --font-sans: "Inter", "Noto Sans SC VF", -apple-system, BlinkMacSystemFont,
    "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Inter", "Noto Sans SC VF", -apple-system, BlinkMacSystemFont,
    "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono",
    Menlo, Consolas, monospace;

  /* ---- 字号（流体刻度，桌面 → 手机自动收敛）---- */
  --fs-hero:    clamp(40px, 7.6vw, 88px);
  --fs-h1:      clamp(34px, 5.6vw, 64px);
  --fs-h2:      clamp(26px, 3.5vw, 44px);
  --fs-h3:      clamp(19px, 1.9vw, 26px);
  --fs-h4:      clamp(17px, 1.4vw, 20px);
  --fs-deck:    clamp(17px, 1.5vw, 21px);
  --fs-body:    17px;
  --fs-sm:      15px;
  --fs-xs:      13px;
  --fs-eyebrow: 12px;
  --fs-quote:   clamp(24px, 4vw, 46px);

  /* ---- 字重 ---- */
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semi: 600;
  --fw-bold: 700;

  /* ---- 行高 / 字距（Apple：显示级收紧，正文级放松）---- */
  --lh-display: 1.06;
  --lh-title: 1.14;
  --lh-cjk: 1.7;
  --lh-body: 1.55;
  --ls-display: -0.03em;
  --ls-title: -0.022em;
  --ls-body: -0.005em;
  --ls-eyebrow: 0.06em;

  /* ---- 间距 ---- */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 20px; --sp-6: 24px; --sp-8: 32px; --sp-10: 40px;
  --sp-12: 48px; --sp-16: 64px; --sp-20: 80px; --sp-24: 96px; --sp-30: 120px;

  /* ---- 布局 ---- */
  --container: 1024px;
  --container-wide: 1240px;
  --text-max: 720px;
  --gutter: 22px;
  --section-y: 120px;
  --nav-h: 48px;

  /* ---- 圆角（continuous corner 观感）---- */
  --r-sm: 8px; --r-md: 12px; --r-lg: 18px; --r-xl: 28px; --r-pill: 980px;

  /* ---- 缓动与时长 ---- */
  --ease: cubic-bezier(0.28, 0, 0.22, 1);
  --ease-soft: cubic-bezier(0.25, 0.1, 0.25, 1);
  --t-fast: 150ms; --t-base: 220ms; --t-slow: 400ms; --t-reveal: 760ms;

  /* ---- 层叠 ---- */
  --z-nav: 9000; --z-overlay: 9600; --z-modal: 9800; --z-toast: 9900;
}

/* ---------- 深色（默认：夜间备考场景）---------- */
:root,
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --bg-2: #0a0a0b;
  --surface: #141416;
  --surface-2: #1c1c1e;
  --surface-3: #242426;
  --fg: #f5f5f7;
  --fg-2: #c7c7cc;
  --muted: #8e8e93;
  --muted-2: #636366;
  --ln-hair: rgba(255, 255, 255, 0.09);
  --ln-strong: rgba(255, 255, 255, 0.16);
  --accent: #2997ff;
  --accent-hover: #4aa8ff;
  --accent-press: #0071e3;
  --accent-ink: #ffffff;
  --accent-soft: rgba(41, 151, 255, 0.14);
  --brand: #ffd91f;
  --brand-ink: #1d1d1f;
  --nav-bg: rgba(10, 10, 11, 0.72);
  --shadow-raised: 0 24px 60px -24px rgba(0, 0, 0, 0.9);
  --shadow-hover: 0 40px 80px -32px rgba(0, 0, 0, 0.95);
  --shadow-panel: 0 1px 0 rgba(255, 255, 255, 0.05) inset;
  --ok: #30d158;
  --warn: #ffd60a;
  --danger: #ff453a;
}

/* ---------- 浅色 ---------- */
html[data-theme="light"] {
  color-scheme: light;
  --bg: #ffffff;
  --bg-2: #fbfbfd;
  --surface: #f5f5f7;
  --surface-2: #f0f0f2;
  --surface-3: #e8e8ed;
  --fg: #1d1d1f;
  --fg-2: #424245;
  --muted: #6e6e73;
  --muted-2: #86868b;
  --ln-hair: rgba(0, 0, 0, 0.09);
  --ln-strong: rgba(0, 0, 0, 0.16);
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-press: #0066cc;
  --accent-ink: #ffffff;
  --accent-soft: rgba(0, 113, 227, 0.1);
  --brand: #ffd91f;
  --brand-ink: #1d1d1f;
  --nav-bg: rgba(255, 255, 255, 0.74);
  --shadow-raised: 0 20px 48px -20px rgba(0, 0, 0, 0.18);
  --shadow-hover: 0 30px 64px -24px rgba(0, 0, 0, 0.24);
  --shadow-panel: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
  --ok: #248a3d;
  --warn: #a05a00;
  --danger: #d70015;
}

/* ============================================================
   1.5 原站变量重映射
   style.css 定义了 --yellow / --paper / --black 等一组变量，全站有数百处
   引用。直接在此重映射，比逐条覆盖规则更彻底，也让旧规则自然融入新系统。
   ============================================================ */
:root,
html[data-theme="dark"] {
  --black: #000000;          /* 原为「深色底」 */
  --black-2: #141416;
  --paper: #f5f5f7;          /* 原为「深色底上的纸白」文字色 */
  --paper-2: #e8e8ed;
  --yellow: #ffd91f;         /* 品牌色：仅作点缀，不承载正文 */
  --yellow-deep: #f0c808;
  --red: #ff453a;
  --green: #30d158;
  --line-d: rgba(255, 255, 255, 0.11);
  --font-body: var(--font-sans);
  --max-width: 1024px;
  --text-width: 720px;
}
html[data-theme="light"] {
  --black: #1d1d1f;
  --black-2: #3a3a3c;
  --paper: #ffffff;
  --paper-2: #f5f5f7;
  --yellow: #a06800;
  --yellow-deep: #8a6100;
  --red: #d70015;
  --green: #248a3d;
  --line-d: rgba(0, 0, 0, 0.11);
  --max-width: 1024px;
  --text-width: 720px;
}

/* ============================================================
   2. 基础与复位
   ============================================================ */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg) !important;
  color: var(--fg);
}

body {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
  font-weight: var(--fw-regular);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
  overflow-x: hidden;
}

/* 原站的噪点 / 扫描线 / 装饰覆盖层：视觉退场 */
body::after { display: none !important; }

::selection { background: var(--accent-soft); color: var(--fg); }

img, svg, video, canvas { max-width: 100%; }
img { height: auto; }

/* 细滚动条 */
* { scrollbar-width: thin; scrollbar-color: var(--ln-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--ln-strong);
  border-radius: 980px;
  border: 3px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background-clip: content-box; background-color: var(--muted-2); }

/* 统一聚焦环 */
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--accent-soft), 0 0 0 1.5px var(--accent);
  border-radius: var(--r-sm);
}

/* ============================================================
   3. 排版系统
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display) !important;
  color: var(--fg);
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); font-weight: var(--fw-bold); line-height: var(--lh-display); letter-spacing: var(--ls-display); }
h2 { font-size: var(--fs-h2); font-weight: var(--fw-semi); line-height: var(--lh-title); letter-spacing: var(--ls-title); }
h3 { font-size: var(--fs-h3); font-weight: var(--fw-semi); line-height: 1.28;  letter-spacing: -0.015em; }
h4 { font-size: var(--fs-h4); font-weight: var(--fw-semi); line-height: 1.34;  letter-spacing: -0.01em; }
h5 { font-size: var(--fs-xs); font-weight: var(--fw-semi); line-height: 1.4;   letter-spacing: 0.01em; }

p {
  margin: 0;
  color: var(--fg-2);
  line-height: var(--lh-cjk);
  font-size: var(--fs-body);
}

a { color: var(--accent); text-decoration: none; transition: color var(--t-fast) var(--ease); }
a:hover { color: var(--accent-hover); }

strong, b { font-weight: var(--fw-semi); color: var(--fg); }

code, kbd, pre, samp { font-family: var(--font-mono) !important; font-size: 0.92em; }

/* 眉标（Apple 的分类小标签） */
.head-tag, .page-tag, .hero-tag, .card-index, .subject-meta, .unit-note,
.ch-num, .m-sub, .sub-label {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  text-transform: none !important;
  color: var(--accent) !important;
  background: none !important;
  border: none !important;
  box-shadow: none !important;
  padding: 0 !important;
  transform: none !important;
  display: inline-block;
  text-shadow: none !important;
}

/* 眉标 / 标签类绝不带色块底。
   注意：中和层会生成 .section-head .head-tag 这类更高特异性的规则，
   所以这里必须按同样或更高的特异性逐条覆盖。 */
.section-head .head-tag,
.page-hero .page-tag,
.hero-left .hero-tag,
.hero .hero-tag,
.unit-head .unit-note,
.chapter-card .ch-num,
.subject-card .card-index,
.nc-card .nc-arrow {
  background: none !important;
  padding: 0 !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}
.section-head .head-tag,
.page-hero .page-tag,
.hero-left .hero-tag { color: var(--accent) !important; }
.hero-left .hero-tag,
.hero .hero-tag { color: var(--brand) !important; }
html[data-theme="light"] .hero .hero-tag { color: #a06800 !important; }
.unit-head .unit-note,
.chapter-card .ch-num,
.subject-card .card-index { color: var(--muted) !important; font-weight: var(--fw-regular) !important; letter-spacing: 0 !important; }

/* Apple 式的等宽数字 */
.num, .cd-days-text, .stat-value, [data-num] {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* ============================================================
   4. 导航 —— Apple 顶部导航：48px、毛玻璃、12px 链接、滚动收窄
   ============================================================ */
.site-nav {
  position: sticky !important;
  top: 0;
  z-index: var(--z-nav);
  height: var(--nav-h) !important;
  min-height: var(--nav-h) !important;
  background: var(--nav-bg) !important;
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border: none !important;
  border-bottom: 1px solid transparent !important;
  box-shadow: none !important;
  transition: height var(--t-slow) var(--ease), border-color var(--t-slow) var(--ease);
}
.site-nav.ae-scrolled { height: 44px !important; min-height: 44px !important; border-bottom-color: var(--ln-hair) !important; }

.nav-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  height: 100%;
  padding: 0 max(var(--gutter), calc((100vw - var(--container-wide)) / 2 + var(--gutter)));
  padding-left: 0; padding-right: 0;
  display: flex;
  align-items: center;
  gap: 18px;
  padding-inline: var(--gutter);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display) !important;
  font-size: 15px !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: -0.012em !important;
  color: var(--fg) !important;
  text-transform: none !important;
  white-space: nowrap;
  flex: none;
}
.nav-logo .logo-mark {
  width: 23px; height: 23px;
  display: grid; place-items: center;
  border-radius: 7px;
  background: var(--brand) !important;
  color: var(--brand-ink) !important;
  font-size: 10px; font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
  border: none !important;
  box-shadow: none !important;
  transform: none !important;
}

.nav-menu {
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 26px !important;
  flex: 1 1 auto;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-item > a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-regular) !important;
  letter-spacing: 0.005em !important;
  color: var(--fg) !important;
  opacity: 0.82;
  padding: 6px 2px;
  border: none !important;
  background: none !important;
  text-transform: none !important;
  transition: opacity var(--t-fast) var(--ease);
}
.nav-item > a:hover { opacity: 1; }
.nav-item > a.active { opacity: 1; }
/* 当前项：Apple 用小圆点而非下划线 */
.nav-item.nav-on > a,
.nav-item > a.active { position: relative; }
.nav-item.nav-on > a::after,
.nav-item > a.active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -1px;
  width: 4px; height: 4px;
  margin-left: -2px;
  border-radius: 50%;
  background: var(--accent);
}
.nav-item .chev { width: 8px; height: 5px; opacity: 0.5; }

.nav-actions {
  display: flex !important;
  align-items: center;
  gap: 6px;
  flex: none;
}

/* 图标按钮：统一 34px 圆形，细描边，玻璃底 */
.nav-icon-btn,
.ae-theme-toggle {
  width: 34px !important; height: 34px !important;
  min-width: 34px;
  display: inline-grid !important;
  place-items: center;
  border-radius: 50% !important;
  border: 1px solid var(--ln-hair) !important;
  background: color-mix(in srgb, var(--fg) 5%, transparent) !important;
  color: var(--fg) !important;
  box-shadow: none !important;
  cursor: pointer;
  padding: 0 !important;
  font-size: 0 !important;      /* 隐藏原来的 ☀ / ☾ 字符，改用 SVG */
  line-height: 0;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
  transform: none !important;
}
.nav-icon-btn svg,
.ae-theme-toggle svg { width: 17px !important; height: 17px !important; display: block; }
.nav-icon-btn:hover,
.ae-theme-toggle:hover {
  background: color-mix(in srgb, var(--fg) 10%, transparent) !important;
  border-color: var(--ln-strong) !important;
}
.nav-icon-btn:active,
.ae-theme-toggle:active { transform: scale(0.94) !important; }

.nav-burger {
  width: 34px !important; height: 34px !important;
  display: none;
  place-items: center;
  border: 1px solid var(--ln-hair) !important;
  background: color-mix(in srgb, var(--fg) 5%, transparent) !important;
  border-radius: 50% !important;
  box-shadow: none !important;
  cursor: pointer;
}
.nav-burger span {
  display: block;
  width: 15px; height: 1.5px;
  background: var(--fg) !important;
  border-radius: 2px;
  margin: 2.5px auto !important;
  transform: none !important;
}

/* 导航右侧顺序：搜索 → 切换主题 → 登录 → 汉堡（用 order 控制，不改 DOM） */
.nav-actions > .nav-icon-btn            { order: 2; }
.nav-actions > .ae-theme-toggle         { order: 3; }
.nav-actions > .nav-burger              { order: 5; }
.nav-actions > .auth-navbtn,
.nav-actions > .auth-float,
.nav-actions > [class*="auth"]          { order: 4; }

/* 登录 / 注册：Apple 蓝色胶囊 */
.nav-actions .auth-navbtn,
.nav-actions .auth-float,
.nav-actions [class*="auth-"][class*="btn"] {
  height: 32px !important;
  padding: 0 16px !important;
  border-radius: var(--r-pill) !important;
  border: none !important;
  background: var(--accent) !important;
  color: var(--accent-ink) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: var(--ls-body);
  box-shadow: none !important;
  display: inline-flex; align-items: center;
  transition: background var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.nav-actions .auth-navbtn:hover,
.nav-actions .auth-float:hover { background: var(--accent-hover) !important; }
.nav-actions .auth-navbtn:active,
.nav-actions .auth-float:active { transform: scale(0.96); }

/* ---- Mega menu：Apple 式浮层 ---- */
.nav-mega {
  background: var(--nav-bg) !important;
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  backdrop-filter: saturate(180%) blur(24px);
  border-bottom: 1px solid var(--ln-hair) !important;
  box-shadow: var(--shadow-raised) !important;
  transform: none !important;
}
.mega-inner { max-width: var(--container-wide); margin: 0 auto; padding: 40px var(--gutter) 48px; }
.mega-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px 32px; }
.mega-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px 32px; }
.mega-col h5 {
  color: var(--muted) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  text-transform: none !important;
  margin-bottom: 14px;
  border: none !important;
  padding: 0 !important;
}
.mega-tile-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.mega-icon {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
  font-size: 16px !important;
  font-weight: var(--fw-semi);
  border: none !important;
  box-shadow: none !important;
  transform: none !important;
}
.mega-name {
  display: block;
  font-family: var(--font-display);
  font-size: 15px !important;
  font-weight: var(--fw-semi) !important;
  color: var(--fg) !important;
  letter-spacing: -0.01em;
}
.mega-tagline {
  display: block;
  font-size: var(--fs-xs) !important;
  color: var(--muted) !important;
  letter-spacing: 0;
}
.mega-list { list-style: none; margin: 0; padding: 0; }
.mega-list li + li { margin-top: 9px; }
.mega-list a {
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  font-size: var(--fs-sm) !important;
  color: var(--fg-2) !important;
  border: none !important;
  background: none !important;
  padding: 0 !important;
  transition: color var(--t-fast) var(--ease);
}
.mega-list a:hover { color: var(--accent) !important; }
.mega-list a i { font-style: normal; font-size: var(--fs-xs); color: var(--muted-2); flex: none; }
.mega-foot {
  display: flex; flex-wrap: wrap; gap: 28px;
  margin-top: 36px; padding-top: 24px;
  border-top: 1px solid var(--ln-hair);
}
.mega-foot a { font-size: var(--fs-sm) !important; color: var(--accent) !important; }

.nav-dim { background: rgba(0, 0, 0, 0.5) !important; -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px); }

/* ---- 移动端抽屉 ---- */
.mobile-menu {
  background: var(--bg) !important;
  border: none !important;
  box-shadow: none !important;
}
.mm-list { list-style: none; margin: 0; padding: 84px 22px 40px; }
.mm-item { border-bottom: 1px solid var(--ln-hair); }
.mm-item > a, .mm-acc-btn {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%;
  padding: 18px 0 !important;
  font-family: var(--font-display) !important;
  font-size: 21px !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: -0.014em !important;
  color: var(--fg) !important;
  background: none !important;
  border: none !important;
  text-align: left;
  cursor: pointer;
  transform: none !important;
}
.mm-sub { padding: 4px 0 16px; }
.mm-sub a {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 0 !important;
  border: none !important;
}
.mm-ic {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
  font-size: 13px !important;
  border: none !important;
  transform: none !important;
}
.mm-txt b { display: block; font-size: var(--fs-body) !important; font-weight: var(--fw-medium) !important; color: var(--fg) !important; }
.mm-txt i { font-style: normal; font-size: var(--fs-xs) !important; color: var(--muted) !important; }
.mm-search-row button {
  width: 100%;
  display: flex; align-items: center; gap: 10px;
  padding: 18px 0 !important;
  background: none !important;
  border: none !important;
  color: var(--muted) !important;
  font-size: var(--fs-body) !important;
  cursor: pointer;
}
.mm-search-row svg { width: 17px; height: 17px; }

/* ============================================================
   5. 首屏 —— 全幅光场 + 左文右「产品视觉」
   ============================================================ */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: #000 !important;
  border: none !important;
}
/* 背景：极光光场 + 左侧暗部（给文案留出对比度）
   注意：legacy-fix.css 会把原站 .hero::before 的条纹背景中和为 background-image:none，
   因此这里的装饰性背景必须显式提升权重（design.css 在其之后加载）。 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("img/bg-aurora.webp") center 58% / cover no-repeat !important;
  filter: brightness(1.5) saturate(1.2) contrast(1.04) !important;
  opacity: 1 !important;
  z-index: -3;
}
/* 左侧暗部 + 底部融入页面背景 */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.80) 0%, rgba(0, 0, 0, 0.48) 36%,
      rgba(0, 0, 0, 0.08) 64%, rgba(0, 0, 0, 0) 80%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0) 26%, rgba(0, 0, 0, 0) 62%, var(--bg) 100%) !important;
  z-index: -1;
}

/* ---- 浅色档：珍珠光场 ---- */
html[data-theme="light"] .hero { background: #fff !important; }
html[data-theme="light"] .hero::before {
  background-image: url("img/bg-pearl.webp") !important;
  background-position: center 50% !important;
  filter: none !important;
}
html[data-theme="light"] .hero::after {
  background:
    radial-gradient(40% 48% at 78% 30%, rgba(0, 113, 227, 0.07) 0%, rgba(0, 113, 227, 0) 70%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.52) 0%, rgba(255, 255, 255, 0.16) 46%, var(--bg) 100%) !important;
}

/* ---- 浅色档：光晕换成更淡的蓝，其余结构不变（已无卡片底色）---- */
html[data-theme="light"] .tv::before {
  background: radial-gradient(48% 50% at 50% 50%,
    rgba(0, 113, 227, 0.10) 0%, rgba(0, 113, 227, 0.03) 44%, transparent 72%) !important;
}
html[data-theme="light"] .cd-days-text { color: var(--fg) !important; }

.hero-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(56px, 7vh, 96px) var(--gutter) clamp(56px, 7vh, 92px);
  min-height: min(84vh, 800px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}

.hero-left { min-width: 0; }

.hero-tag {
  display: inline-flex !important;
  align-items: center;
  gap: 8px;
  color: var(--brand) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: 0.08em !important;
  margin-bottom: 22px;
}
html[data-theme="light"] .hero-tag { color: #a06800 !important; }
.hero-tag::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px color-mix(in srgb, currentColor 18%, transparent);
}

.hero-title {
  display: block;
  margin: 0 0 24px;
  font-family: var(--font-display) !important;
}
.hero-title .row-en,
.hero-title .row-cn { display: block; }
.hero-title .row-en {
  font-size: var(--fs-hero);
  font-weight: var(--fw-bold);
  line-height: 0.98;
  letter-spacing: -0.042em;
  /* Apple 式金属渐变字 */
  background: linear-gradient(180deg, #ffffff 12%, #f5f5f7 46%, #9a9aa1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-shadow: none !important;
  filter: none !important;
  transform: none !important;
}
.hero-title .row-cn {
  margin-top: 6px;
  font-size: calc(var(--fs-hero) * 0.56);
  font-weight: var(--fw-semi);
  line-height: 1.06;
  letter-spacing: -0.028em;
  color: #ffffff;
  text-shadow: none !important;
  transform: none !important;
}
html[data-theme="light"] .hero-title .row-en {
  background: linear-gradient(180deg, #1d1d1f 8%, #3a3a3c 48%, #86868b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
html[data-theme="light"] .hero-title .row-cn { color: #1d1d1f; }
/* 关闭原站 glitch 抖动 */
.hero-title .glitch::before,
.hero-title .glitch::after { display: none !important; content: none !important; }
.hero-title .glitch { animation: none !important; }

.hero-sub {
  max-width: 34em;
  font-size: var(--fs-deck) !important;
  line-height: 1.62 !important;
  color: rgba(245, 245, 247, 0.74) !important;
  margin-bottom: 34px;
  letter-spacing: 0;
  text-wrap: pretty;
}
html[data-theme="light"] .hero-sub { color: var(--muted) !important; }

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
}

/* ---- 倒计时「产品视觉」：不加卡片，数字直接浮在光场上 ---- */
.tv {
  position: relative;
  min-width: 0 !important;
  border: none !important;
  background: none !important;
  -webkit-backdrop-filter: none !important;
  backdrop-filter: none !important;
  box-shadow: none !important;
  padding: 0 !important;
  border-radius: 0 !important;
  transform: none !important;
  overflow: visible !important;
  text-align: center;
}
/* 数字背后的柔和光晕，让粒子有「发光源」而不是压在一块深色矩形上 */
.tv::before {
  content: "" !important;
  display: block !important;
  position: absolute;
  inset: -14% -8% -10% -8%;
  background: radial-gradient(48% 50% at 50% 50%,
    color-mix(in srgb, var(--accent) 20%, transparent) 0%,
    color-mix(in srgb, var(--accent) 6%, transparent) 42%,
    transparent 72%) !important;
  filter: blur(26px);
  z-index: 0;
  pointer-events: none;
}
.tv-screen {
  position: relative;
  z-index: 1;
  border-radius: 0 !important;
  background: none !important;
  padding: 0 !important;
  border: none !important;
  box-shadow: none !important;
  overflow: visible !important;
}
/* 关闭原站 CRT 扫描线与屏幕高光 */
.tv-screen::before,
.tv-screen::after { display: none !important; content: none !important; }

.tv-label {
  display: block !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  text-transform: none !important;
  color: var(--muted) !important;
  margin-bottom: 10px !important;
  background: none !important;
  border: none !important;
  padding: 0 !important;
}

.cd-stage {
  position: relative;
  width: 100% !important;
  height: clamp(150px, 19vw, 240px) !important;
  margin: 0 !important;
  border: none !important;
  background: none !important;
}
#cdCanvas { display: block; width: 100%; height: 100%; }

.cd-fallback {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.cd-fallback.show { display: flex; }
.cd-days-text {
  font-family: var(--font-display) !important;
  font-size: clamp(64px, 9vw, 112px) !important;
  font-weight: var(--fw-bold) !important;
  line-height: 1 !important;
  letter-spacing: -0.045em !important;
  color: var(--fg) !important;
  text-shadow: none !important;
}
.cd-fallback-unit {
  font-size: var(--fs-deck) !important;
  font-weight: var(--fw-medium) !important;
  color: var(--muted) !important;
  align-self: flex-end;
  padding-bottom: 14px;
}

.cd-sub {
  display: flex !important;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  margin-top: 6px !important;
  color: var(--muted) !important;
}
.cd-sub .cd-sub-unit { font-size: var(--fs-sm) !important; font-weight: var(--fw-medium); color: var(--fg-2) !important; }
.cd-sub .cd-sub-en {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-eyebrow) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  color: var(--muted) !important;
  text-transform: none !important;
  opacity: 0.8;
}

.tv-progress {
  position: relative;
  margin: 30px 0 4px !important;
  height: 3px !important;
  border-radius: 980px !important;
  background: var(--ln-hair) !important;
  border: none !important;
  overflow: visible !important;
}
.cd-progress-bar {
  height: 100% !important;
  border-radius: 980px !important;
  background: linear-gradient(90deg, var(--accent-press), var(--accent)) !important;
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 55%, transparent) !important;
  transition: width var(--t-reveal) var(--ease);
}
.cd-progress-spark {
  position: absolute;
  top: 50%;
  width: 9px; height: 9px;
  margin-top: -4.5px; margin-left: -4.5px;
  border-radius: 50%;
  background: #fff !important;
  box-shadow: 0 0 10px 2px color-mix(in srgb, var(--accent) 70%, transparent) !important;
  border: none !important;
  transform: none !important;
}

.tv-quote {
  margin: 22px auto 0 !important;
  padding: 0 !important;
  border: none !important;
  max-width: 30em;
  text-align: center;
  font-size: var(--fs-sm) !important;
  line-height: 1.7 !important;
  color: var(--muted) !important;
  font-style: normal !important;
  letter-spacing: 0;
  background: none !important;
}

/* 首屏里的加号角标（原站装饰）退场 */
.tv > .tv-corner, .tv .tv-corner { display: none !important; }

/* ============================================================
   6. 章节与页面首屏
   ============================================================ */
.section {
  position: relative;
  padding: var(--section-y) 0 !important;
  background: var(--bg) !important;
  border: none !important;
}
.section-inner {
  max-width: var(--container) !important;
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section-head {
  max-width: 760px;
  margin: 0 auto clamp(40px, 5vw, 64px);
  text-align: center;
}
.section-head .head-tag { display: block; margin-bottom: 14px; }
.section-head h2 { margin: 0 0 16px; }
.section-head p {
  font-size: var(--fs-deck) !important;
  line-height: 1.6 !important;
  color: var(--muted) !important;
  max-width: 640px;
  margin: 0 auto;
  letter-spacing: 0;
}

/* 子页面首屏：Apple 产品页式 —— 素材图 + 蒙版
   图片由 html[data-page] 决定（motion.js 写入），栏目没配图时只留光晕。 */
.page-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  max-width: none !important;
  margin: 0 !important;
  padding: clamp(88px, 13vh, 156px) 0 clamp(56px, 7vh, 92px) !important;
  min-height: clamp(320px, 42vh, 460px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  background: var(--bg) !important;
  border: none !important;
}
/* 图层一：栏目素材图（缺失时为 none），下面垫品牌光晕 */
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    var(--page-img, none),
    radial-gradient(52% 46% at 50% 0%, color-mix(in srgb, var(--accent) 20%, transparent) 0%, transparent 70%),
    radial-gradient(40% 40% at 82% 8%, color-mix(in srgb, var(--brand) 8%, transparent) 0%, transparent 72%) !important;
  background-size: cover, auto, auto;
  background-position: center 44%, center top, center top;
  background-repeat: no-repeat;
  opacity: 0.9;
  z-index: -2;
  pointer-events: none;
}
/* 图层二：蒙版。深色档压暗，浅色档提亮，保证标题在任何素材图上都清晰。
   素材图本身极低对比，蒙版压到 0.2–0.45 之间仍可读，但图能透出轮廓。 */
.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
    rgba(0, 0, 0, 0.48) 0%,
    rgba(0, 0, 0, 0.3) 38%,
    rgba(0, 0, 0, 0.2) 66%,
    var(--bg) 100%) !important;
  z-index: -1;
  pointer-events: none;
}
html[data-theme="light"] .page-hero::after {
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.55) 0%,
    rgba(255, 255, 255, 0.4) 38%,
    rgba(255, 255, 255, 0.3) 66%,
    var(--bg) 100%) !important;
}
/* 没有配图的栏目：蒙版淡一些，让光晕透出来 */
html:not([data-page="math"]):not([data-page="politics"]):not([data-page="english"]):not([data-page="major"]):not([data-page="resources"]):not([data-page="rank"]):not([data-page="cet6"]) .page-hero::after {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.42) 0%, rgba(0, 0, 0, 0.16) 46%, var(--bg) 100%) !important;
}
html[data-theme="light"]:not([data-page="math"]):not([data-page="politics"]):not([data-page="english"]):not([data-page="major"]):not([data-page="resources"]):not([data-page="rank"]):not([data-page="cet6"]) .page-hero::after {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.55) 0%, rgba(255, 255, 255, 0.2) 46%, var(--bg) 100%) !important;
}

/* ---------- 栏目素材图分配 ----------
   每张图约 10–47 KB，只在对应栏目页加载；其它页不会请求。 */
html[data-page="math"]      { --page-img: url("img/sec-math.webp"); }
html[data-page="politics"]  { --page-img: url("img/sec-politics.webp"); }
html[data-page="english"]   { --page-img: url("img/sec-english.webp"); }
html[data-page="cet6"]      { --page-img: url("img/sec-english.webp"); }
html[data-page="major"]     { --page-img: url("img/sec-major.webp"); }
html[data-page="resources"] { --page-img: url("img/sec-resources.webp"); }
html[data-page="rank"]      { --page-img: url("img/sec-rank.webp"); }

/* 学科卡：同一张素材图作低透明底，让四个「栏目入口」各有其貌 */
.subject-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--card-img, none);
  background-size: cover;
  background-position: center 40%;
  opacity: 0.42;
  z-index: 0;
  pointer-events: none;
  transition: opacity var(--t-base) var(--ease);
}
.subject-card:hover::after { opacity: 0.56; }
/* 压一层竖向渐变，保证卡片内文字对比度 */
.subject-card::before {
  content: "" !important;
  display: block !important;
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--surface) 52%, transparent) 0%,
    color-mix(in srgb, var(--surface) 30%, transparent) 45%,
    color-mix(in srgb, var(--surface) 70%, transparent) 100%) !important;
  z-index: 0;
  pointer-events: none;
}
html[data-theme="light"] .subject-card::after { opacity: 0.22; }
html[data-theme="light"] .subject-card:hover::after { opacity: 0.32; }
html[data-theme="light"] .subject-card::before {
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.66) 0%, rgba(255, 255, 255, 0.5) 45%, rgba(255, 255, 255, 0.82) 100%) !important;
}
.subject-card[href^="math"]     { --card-img: url("img/sec-math.webp"); }
.subject-card[href^="politics"] { --card-img: url("img/sec-politics.webp"); }
.subject-card[href^="english"]  { --card-img: url("img/sec-english.webp"); }
.subject-card[href^="major"]    { --card-img: url("img/sec-major.webp"); }
.page-hero .page-tag { display: block; margin-bottom: 16px; }
.page-hero h1 {
  max-width: 900px;
  margin: 0 auto 20px;
  font-size: var(--fs-h1);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-display);
  line-height: var(--lh-display);
}
.page-hero p {
  max-width: 660px;
  margin: 0 auto !important;
  font-size: var(--fs-deck) !important;
  line-height: 1.62 !important;
  color: var(--muted) !important;
  letter-spacing: 0;
}

/* 单元块（数学/政治等页面的章节分组） */
.unit-block { margin-bottom: clamp(48px, 6vw, 80px) !important; border: none !important; background: none !important; }
.unit-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding-bottom: 20px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--ln-hair) !important;
  border-top: none !important;
  background: none !important;
}
.unit-head h2 { font-size: var(--fs-h3) !important; font-weight: var(--fw-semi) !important; }
.unit-note { color: var(--muted) !important; font-weight: var(--fw-regular) !important; letter-spacing: 0 !important; }

/* ============================================================
   7. 卡片系统
   ============================================================ */
/* ---- 站点导航卡（bento）---- */
.nc-grid {
  display: grid !important;
  grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
  gap: 18px !important;
  align-items: stretch;
}
/* 6 张卡片在 3 列下正好两行。此前让首卡跨 2 列，会剩出 1 个空位，
   反而破坏网格的整齐——Apple 的 bento 也只在能整除时才用跨列。 */
.nc-card {
  position: relative;
  display: flex !important;
  flex-direction: column;
  align-items: flex-start;
  min-height: 178px;
  padding: 30px 30px 26px !important;
  border-radius: var(--r-lg) !important;
  border: 1px solid transparent !important;
  background: var(--surface) !important;
  box-shadow: none !important;
  overflow: hidden;
  color: var(--fg) !important;
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease),
    background var(--t-base) var(--ease);
}
html[data-theme="dark"] .nc-card { background: var(--surface) !important; border-color: var(--ln-hair) !important; }
.nc-card:hover {
  transform: translateY(-5px) !important;
  box-shadow: var(--shadow-hover) !important;
  background: var(--surface-2) !important;
}
.nc-card > * { position: relative; z-index: 1; }

.nc-icon {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  margin-bottom: 26px;
  border-radius: 0 !important;
  background: none !important;
  border: none !important;
  box-shadow: none !important;
  color: var(--accent) !important;
}
.nc-icon svg {
  width: 38px; height: 38px;
  display: block;
  fill: none !important;
  stroke: currentColor !important;
  stroke-width: 1.5 !important;
}
/* 原站内联 SVG 的写死配色 → 统一到 currentColor（表现属性优先级最低，可直接覆盖） */
.nc-icon svg [fill]:not([fill="none"]) { fill: none !important; }
.nc-icon svg [stroke] { stroke: currentColor !important; }
.nc-icon svg text { fill: currentColor !important; }

.nc-card h3 {
  margin: 0 0 8px !important;
  font-size: 19px !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: -0.014em;
  color: var(--fg) !important;
}
.nc-card p {
  margin: 0 0 22px !important;
  font-size: var(--fs-sm) !important;
  line-height: 1.6 !important;
  color: var(--muted) !important;
  max-width: 34ch;
}
.nc-arrow {
  margin-top: auto;
  font-size: var(--fs-sm) !important;
  font-weight: var(--fw-medium);
  color: var(--accent) !important;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: gap var(--t-fast) var(--ease);
}
.nc-card:hover .nc-arrow { gap: 9px; }

/* ---- 学科模块卡 ---- */
.subject-grid {
  display: grid !important;
  grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
  gap: 18px !important;
}
.subject-card {
  position: relative;
  display: flex !important;
  flex-direction: column;
  padding: 30px 30px 26px !important;
  border-radius: var(--r-lg) !important;
  border: 1px solid transparent !important;
  background: var(--surface) !important;
  box-shadow: none !important;
  overflow: hidden;
  color: var(--fg) !important;
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
html[data-theme="dark"] .subject-card { border-color: var(--ln-hair) !important; }
.subject-card:hover { transform: translateY(-5px) !important; box-shadow: var(--shadow-hover) !important; }
.subject-card > * { position: relative; z-index: 1; }
/* 原站在卡片左上角挂了一个旋转色块装饰 —— 该装饰被中和层清成了纯色块，
   这里彻底退场；::before 改作素材图的对比度蒙版（见 6 节栏目素材图分配）。 */

/* 图标与导航卡统一：回到正常流、左对齐、同尺寸同色 */
.card-icon {
  position: static !important;
  inset: auto !important;
  width: auto !important;
  height: auto !important;
  display: block !important;
  align-items: initial !important;
  justify-content: initial !important;
  font-family: var(--font-display) !important;
  font-size: 30px !important;
  font-weight: var(--fw-semi);
  line-height: 1;
  margin: 0 0 26px !important;
  color: var(--accent) !important;
  background: none !important;
  border: none !important;
  box-shadow: none !important;
  transform: none !important;
  text-shadow: none !important;
}
.subject-card .card-index { display: block; margin-bottom: 10px; color: var(--muted) !important; }
.subject-card h3 {
  margin: 0 0 10px !important;
  font-size: 21px !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: -0.018em;
  color: var(--fg) !important;
  text-transform: none !important;
}
.subject-desc {
  margin: 0 0 20px !important;
  font-size: var(--fs-sm) !important;
  line-height: 1.62 !important;
  color: var(--muted) !important;
  min-height: 0 !important;
}
/* 单位/章节数：原来的深色小方块 → 克制的元信息文字 */
.subject-card .subject-meta {
  display: block !important;
  background: none !important;
  color: var(--muted-2) !important;
  padding: 0 !important;
  margin: 0 0 16px !important;
}
.subject-more {
  margin-top: auto;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-sm) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: 0 !important;
  color: var(--accent) !important;
}
/* 去掉原来的红色 ▸▸，改用与全站一致的折角箭头 */
.subject-card .subject-more::after {
  content: "" !important;
  display: inline-block;
  width: 6px; height: 6px;
  margin-left: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg) translateY(-1px);
  color: inherit !important;
}
.subject-card:hover .subject-more { color: var(--accent-hover) !important; }

/* ---- 章节笔记卡 ---- */
.chapter-grid {
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr)) !important;
  gap: 16px !important;
}
.chapter-card {
  display: flex !important;
  flex-direction: column;
  padding: 26px 26px 24px !important;
  border-radius: var(--r-md) !important;
  border: 1px solid var(--ln-hair) !important;
  background: var(--surface) !important;
  box-shadow: none !important;
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease),
    background var(--t-base) var(--ease);
  overflow: hidden;
}
.chapter-card:hover {
  transform: translateY(-4px) !important;
  border-color: var(--ln-strong) !important;
  background: var(--surface-2) !important;
}
.chapter-card .ch-num { display: block; margin-bottom: 12px; color: var(--muted) !important; }
.chapter-card h4 {
  margin: 0 0 8px !important;
  font-size: var(--fs-h4) !important;
  font-weight: var(--fw-semi) !important;
  color: var(--fg) !important;
  line-height: 1.35;
}
.chapter-card .lec-desc {
  margin: 0 0 18px !important;
  font-size: var(--fs-sm) !important;
  line-height: 1.6 !important;
  color: var(--muted) !important;
}
.lec-link {
  margin-top: auto;
  display: inline-flex !important;
  align-items: center;
  gap: 5px;
  font-size: var(--fs-sm) !important;
  font-weight: var(--fw-medium) !important;
  color: var(--accent) !important;
  background: none !important;
  border: none !important;
  padding: 0 !important;
  border-radius: 0 !important;
  transform: none !important;
  box-shadow: none !important;
  width: auto !important;
  transition: gap var(--t-fast) var(--ease);
}
.lec-link:hover { gap: 9px; color: var(--accent-hover) !important; }

/* 通用工具卡 / 文件卡 / 信息卡 */
.ics-grid, .file-grid {
  display: grid !important;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)) !important;
  gap: 16px !important;
}
.opc-key, .opc-rule, .opc-board {
  border-radius: var(--r-md) !important;
  border: 1px solid var(--ln-hair) !important;
  background: var(--surface) !important;
  box-shadow: none !important;
  transform: none !important;
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.opc-key:hover, .opc-rule:hover { border-color: var(--ln-strong) !important; }

/* ---- 宣言：全幅影像条 ---- */
.manifesto {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: clamp(420px, 68vh, 640px);
  display: grid;
  place-items: center;
  margin: 0 !important;
  padding: clamp(72px, 10vh, 120px) 0 !important;
  background: #000 !important;
  border: none !important;
}
.manifesto::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("img/band-desk.webp") center 46% / cover no-repeat !important;
  transform: scale(1.04);
  z-index: -2;
}
.manifesto::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, var(--bg) 0%, rgba(0, 0, 0, 0.55) 26%, rgba(0, 0, 0, 0.62) 74%, var(--bg) 100%),
    radial-gradient(90% 80% at 50% 50%, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.6) 100%) !important;
  z-index: -1;
}
.manifesto .section-inner { position: relative; text-align: center; padding: 0 var(--gutter); }
.m-quote {
  font-family: var(--font-display) !important;
  font-size: var(--fs-quote) !important;
  font-weight: var(--fw-semi) !important;
  line-height: 1.28 !important;
  letter-spacing: var(--ls-title) !important;
  color: #f5f5f7 !important;
  max-width: 22em;
  margin: 0 auto !important;
  text-shadow: 0 2px 40px rgba(0, 0, 0, 0.7);
  background: none !important;
  border: none !important;
  padding: 0 !important;
}
.m-sub {
  display: block;
  margin-top: 26px !important;
  color: rgba(245, 245, 247, 0.62) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: 0.04em !important;
}

/* ============================================================
   8. 按钮与链接
   ============================================================ */
.btn-primary,
.btn-ghost,
button.btn, a.btn {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-body) !important;
  font-weight: var(--fw-medium) !important;
  line-height: 1 !important;
  border-radius: var(--r-pill) !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  text-decoration: none !important;
  letter-spacing: var(--ls-body);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
  transform: none !important;
  text-shadow: none !important;
}

.btn-primary {
  padding: 15px 28px !important;
  border: none !important;
  background: var(--accent) !important;
  color: var(--accent-ink) !important;
  box-shadow: none !important;
}
.btn-primary:hover { background: var(--accent-hover) !important; color: var(--accent-ink) !important; }
.btn-primary:active { transform: scale(0.97) !important; }

/* 次要动作 → Apple 的蓝色文字链「进一步了解 ›」 */
.btn-ghost {
  padding: 15px 4px !important;
  border: none !important;
  background: none !important;
  color: var(--accent) !important;
  box-shadow: none !important;
  gap: 5px;
}
.btn-ghost::after {
  content: "";
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg) translateY(-1px);
  margin-left: 2px;
  transition: transform var(--t-fast) var(--ease);
}
.btn-ghost:hover { color: var(--accent-hover) !important; }
.btn-ghost:hover::after { transform: rotate(-45deg) translate(2px, -3px); }
.btn-ghost:active { transform: scale(0.98) !important; }

/* 表单提交类按钮的统一升级 */
input[type="submit"], button[type="submit"] {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-body) !important;
  font-weight: var(--fw-medium) !important;
  border-radius: var(--r-pill) !important;
  padding: 14px 26px !important;
  border: none !important;
  background: var(--accent) !important;
  color: var(--accent-ink) !important;
  cursor: pointer;
  box-shadow: none !important;
  transition: background var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
input[type="submit"]:hover, button[type="submit"]:hover { background: var(--accent-hover) !important; }
input[type="submit"]:active, button[type="submit"]:active { transform: scale(0.97) !important; }

/* ============================================================
   9. 表格与表单
   ============================================================ */
table, .table {
  width: 100%;
  border-collapse: collapse !important;
  border-spacing: 0;
  font-size: var(--fs-sm);
  border: none !important;
}
th {
  text-align: left;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow);
  color: var(--muted) !important;
  padding: 0 14px 13px !important;
  border: none !important;
  border-bottom: 1px solid var(--ln-hair) !important;
  background: none !important;
  text-transform: none !important;
}
td {
  padding: 17px 14px !important;
  border: none !important;
  border-bottom: 1px solid var(--ln-hair) !important;
  color: var(--fg-2) !important;
  background: none !important;
}
tbody tr { transition: background var(--t-fast) var(--ease); }
tbody tr:hover td { background: var(--surface) !important; }

input[type="text"], input[type="search"], input[type="email"], input[type="password"],
input[type="number"], input[type="tel"], input[type="url"], input[type="date"],
select, textarea {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-body) !important;
  color: var(--fg) !important;
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-md) !important;
  padding: 12px 15px !important;
  height: auto;
  min-height: 46px;
  box-shadow: none !important;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
  -webkit-appearance: none;
  appearance: none;
}
textarea { min-height: 108px; line-height: 1.6; resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--muted-2) !important; }
input:focus, select:focus, textarea:focus {
  outline: none !important;
  border-color: var(--accent) !important;
  background: var(--bg) !important;
  box-shadow: 0 0 0 4px var(--accent-soft) !important;
}
label {
  display: block;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium);
  color: var(--muted) !important;
  margin-bottom: 7px;
  letter-spacing: 0.01em;
}

/* ============================================================
   10. 页脚
   ============================================================ */
.site-footer {
  background: var(--bg-2) !important;
  border: none !important;
  border-top: 1px solid var(--ln-hair) !important;
  padding: 56px 0 44px !important;
  margin: 0 !important;
}
.footer-inner {
  max-width: var(--container) !important;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.footer-nav {
  display: flex !important;
  flex-wrap: wrap;
  gap: 10px 26px;
  padding-bottom: 26px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--ln-hair);
}
.footer-nav a {
  font-size: var(--fs-xs) !important;
  color: var(--fg-2) !important;
  letter-spacing: 0;
  transition: color var(--t-fast) var(--ease);
}
.footer-nav a:hover { color: var(--accent) !important; }
.copyright {
  font-size: var(--fs-xs) !important;
  line-height: 1.8 !important;
  color: var(--muted-2) !important;
  letter-spacing: 0;
}

/* 页脚外观控件：Apple HIG 的三段式「浅色 / 深色 / 自动」 */
.ae-appearance {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 26px;
}
.ae-appearance-label {
  font-size: var(--fs-xs);
  color: var(--muted);
  letter-spacing: 0.01em;
}
.ae-seg {
  display: inline-flex;
  padding: 2px;
  gap: 2px;
  border-radius: var(--r-pill);
  background: var(--surface);
  border: 1px solid var(--ln-hair);
}
.ae-seg button {
  appearance: none;
  border: none;
  background: none;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  padding: 6px 14px;
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.ae-seg button:hover { color: var(--fg); }
.ae-seg button[aria-pressed="true"] {
  background: var(--bg);
  color: var(--fg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.16);
}

/* ============================================================
   11. 浮层
   ============================================================ */
.search-overlay {
  background: rgba(0, 0, 0, 0.56) !important;
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
}
.search-box {
  background: var(--bg) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-lg) !important;
  box-shadow: var(--shadow-raised) !important;
  overflow: hidden;
}
.search-input-row {
  display: flex; align-items: center; gap: 12px;
  padding: 6px 8px 6px 18px !important;
  border-bottom: 1px solid var(--ln-hair) !important;
  background: none !important;
}
.search-input-row .search-glyph svg { width: 18px; height: 18px; color: var(--muted); }
.search-input {
  flex: 1;
  min-height: 52px !important;
  border: none !important;
  background: none !important;
  box-shadow: none !important;
  font-size: var(--fs-deck) !important;
  padding: 0 !important;
}
.search-input:focus { background: none !important; box-shadow: none !important; }
.search-close {
  flex: none;
  font-family: var(--font-sans);
  font-size: 11px !important;
  font-weight: var(--fw-medium);
  letter-spacing: 0.02em;
  color: var(--muted) !important;
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-sm) !important;
  padding: 6px 9px !important;
  cursor: pointer;
}
.search-results { padding: 8px !important; }
.search-results a, .search-result {
  display: block;
  padding: 13px 16px !important;
  border-radius: var(--r-md) !important;
  border: none !important;
  color: var(--fg) !important;
  font-size: var(--fs-sm) !important;
  transition: background var(--t-fast) var(--ease);
}
.search-results a:hover, .search-result:hover { background: var(--surface) !important; }

/* 通用弹窗 */
.modal, .dialog, .auth-modal, .overlay-card {
  background: var(--bg) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-lg) !important;
  box-shadow: var(--shadow-raised) !important;
}
.auth-overlay { background: rgba(0, 0, 0, 0.52) !important; -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }

/* ============================================================
   11.5 图标层（icons.js 注入的内联 SVG）
   尺寸走 1em，天然继承所在上下文的字号，无需逐处指定
   ============================================================ */
.ae-ico-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: -0.14em;
  flex: none;
  line-height: 0;
}
.ae-ico {
  width: 1em;
  height: 1em;
  display: block;
  stroke-width: 1.7;
  transition: stroke var(--t-fast) var(--ease);
}
/* 大尺寸场景下收细描边，保持与 Apple 线性图标一致的视觉重量 */
.card-icon .ae-ico,
.nc-icon .ae-ico,
.mm-ic .ae-ico { stroke-width: 1.3; }
/* 正文内联图标：略降透明度，避免抢文字 */
p .ae-ico-wrap,
li .ae-ico-wrap,
td .ae-ico-wrap { opacity: 0.9; }
/* 导航 / 抽屉里的 emoji 图标：与文字同色同高 */
.nav-item .ae-ico-wrap,
.mm-item .ae-ico-wrap,
.mm-sub .ae-ico-wrap { color: currentColor; }

/* ---- 卡片图标：统一为图标集的线性图标 ---- */
.card-icon svg {
  display: block;
  fill: none !important;
  stroke: currentColor !important;
  stroke-width: 1.45 !important;
  overflow: visible;
  width: 32px !important;
  height: 32px !important;
}

/* 学科小图标（mega menu / 移动端抽屉） */
.mega-icon svg,
.mm-ic svg {
  width: 18px !important; height: 18px !important;
  display: block;
  fill: none !important;
  stroke: currentColor !important;
  stroke-width: 1.6 !important;
}
.mm-ic svg { width: 15px !important; height: 15px !important; }

/* ============================================================
   11.6 联机大厅（MC / 饥荒）— 保留插画，只统一组件外壳
   ============================================================ */
.mc-status-card {
  display: flex !important;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 26px 28px !important;
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-lg) !important;
  box-shadow: none !important;
}
.mc-status-left { display: flex; align-items: center; gap: 16px; }
.mc-dot {
  width: 10px !important; height: 10px !important;
  border-radius: 50% !important;
  flex-shrink: 0;
  background: var(--muted-2) !important;
  box-shadow: none !important;
}
.mc-dot.on { background: var(--ok) !important; box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 22%, transparent) !important; }
.mc-dot.off { background: var(--danger) !important; box-shadow: 0 0 0 4px color-mix(in srgb, var(--danger) 20%, transparent) !important; }
.mc-dot.na { background: var(--muted-2) !important; }
.mc-state {
  font-weight: var(--fw-semi) !important;
  font-size: var(--fs-body) !important;
  color: var(--fg) !important;
  letter-spacing: -0.012em;
}
.mc-sub {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0 !important;
  color: var(--muted) !important;
  margin-top: 5px !important;
}
.mc-addr-wrap { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.mc-addr {
  font-family: var(--font-mono) !important;
  font-size: 17px !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: 0.01em !important;
  color: var(--fg) !important;
  background: var(--surface-2) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-md) !important;
  padding: 11px 18px !important;
}
.btn-copy {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: 0 !important;
  color: var(--accent-ink) !important;
  background: var(--accent) !important;
  border: none !important;
  border-radius: var(--r-pill) !important;
  padding: 11px 20px !important;
  cursor: pointer;
  box-shadow: none !important;
  transform: none !important;
  transition: background var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.btn-copy:hover { background: var(--accent-hover) !important; color: var(--accent-ink) !important; }
.btn-copy:active { transform: scale(0.97) !important; }

.mc-steps { display: grid !important; grid-template-columns: repeat(3, minmax(0, 1fr)) !important; gap: 16px !important; }
.mc-step {
  display: flex !important;
  gap: 16px;
  padding: 22px !important;
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-md) !important;
  box-shadow: none !important;
}
.mc-step b {
  font-family: var(--font-display) !important;
  font-size: 22px !important;
  font-weight: var(--fw-semi) !important;
  color: var(--accent) !important;
  line-height: 1.1;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.mc-step h4 {
  font-size: var(--fs-body) !important;
  font-weight: var(--fw-semi) !important;
  color: var(--fg) !important;
  margin: 0 0 7px !important;
  background: none !important;
  letter-spacing: -0.012em;
}
.mc-step p { font-size: var(--fs-xs) !important; line-height: 1.68 !important; color: var(--muted) !important; }
.mc-step p b {
  font-size: inherit !important;
  color: var(--fg-2) !important;
  font-family: var(--font-sans) !important;
  font-weight: var(--fw-semi);
}
@media (max-width: 860px) {
  .mc-steps { grid-template-columns: 1fr !important; }
}

/* ============================================================
   11.7 番茄专注（iframe 嵌入）
   内层是自包含的 Tomodoro 应用，这里只统一它外面的框与说明卡
   ============================================================ */
.pomo-panel { padding: 0 !important; }
.pomo-bar {
  display: flex !important;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px !important;
  position: relative;
  z-index: 1;
}
.pomo-dot {
  width: 8px !important; height: 8px !important;
  border-radius: 50% !important;
  background: var(--danger) !important;
  flex-shrink: 0;
  animation: none !important;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--danger) 18%, transparent) !important;
}
.pomo-bar-title {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  color: var(--muted) !important;
}
.pomo-open {
  margin-left: auto;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: 0 !important;
  color: var(--fg-2) !important;
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-pill) !important;
  padding: 8px 16px !important;
  text-decoration: none !important;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}
.pomo-open:hover {
  background: var(--surface-2) !important;
  border-color: var(--ln-strong) !important;
  color: var(--fg) !important;
}

/* 嵌入框：圆角容器 + 发丝描边，取代原来的 2px 硬边与深蓝底 */
.pomo-frame {
  position: relative;
  z-index: 1;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-lg) !important;
  background: var(--surface) !important;
  overflow: hidden;
}
.pomo-frame iframe {
  display: block;
  width: 100%;
  height: clamp(520px, 72vh, 700px);
  border: 0;
  background: transparent;
}

.pomo-tips { display: grid !important; grid-template-columns: repeat(4, minmax(0, 1fr)) !important; gap: 16px !important; margin-top: 28px !important; }
.pomo-tip {
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-md) !important;
  padding: 18px 20px !important;
  box-shadow: none !important;
}
.pomo-tip b {
  display: block;
  font-size: var(--fs-body) !important;
  font-weight: var(--fw-semi) !important;
  color: var(--fg) !important;
  margin-bottom: 8px !important;
  letter-spacing: -0.012em;
}
.pomo-tip span { font-size: var(--fs-xs) !important; line-height: 1.7 !important; color: var(--muted) !important; }
@media (max-width: 860px) {
  .pomo-tips { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
}
@media (max-width: 560px) {
  .pomo-tips { grid-template-columns: 1fr !important; }
}

/* ============================================================
   11.8 打卡作战室 —— 当前时段倒计时
   原设计是「CRT 监视器」：4px 双层边框 + 黄色硬偏移阴影 + 扫描线 +
   高饱和黄数字 + 闪烁红冒号 + 危险条纹进度条。这里换成安静的排版时钟。
   ============================================================ */
.sch-panel {
  position: relative;
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  outline: none !important;
  border-radius: var(--r-lg) !important;
  box-shadow: none !important;
  padding: 28px 32px 24px !important;
  overflow: hidden;
}
/* 关掉屏内扫描线 */
.sch-panel::after { display: none !important; content: none !important; }

.sch-panel-top { display: flex !important; align-items: center; gap: 12px; flex-wrap: wrap; position: relative; z-index: 1; }

.sch-now-badge {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  padding: 5px 12px !important;
  border-radius: var(--r-pill) !important;
  border: none !important;
  background: var(--ln-hair) !important;
  color: var(--fg-2) !important;
}
.sch-now-badge.t-study { background: color-mix(in srgb, var(--accent) 20%, transparent) !important; color: var(--accent) !important; }
.sch-now-badge.t-rest  { background: color-mix(in srgb, var(--ok) 20%, transparent) !important;     color: var(--ok) !important; }
.sch-now-badge.t-life  { background: var(--ln-hair) !important;                                     color: var(--fg-2) !important; }
.sch-now-badge.t-fun   { background: color-mix(in srgb, var(--danger) 20%, transparent) !important; color: var(--danger) !important; }
.sch-now-badge.t-idle  { background: transparent !important; color: var(--muted) !important; border: 1px solid var(--ln-hair) !important; }

.sch-now-name {
  font-family: var(--font-display) !important;
  font-size: var(--fs-h4) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: -0.016em !important;
  color: var(--fg) !important;
}

.sch-now-range {
  margin-left: auto;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: 0 !important;
  color: var(--muted) !important;
  border: none !important;
  background: var(--ln-hair) !important;
  border-radius: var(--r-pill) !important;
  padding: 5px 12px !important;
}

/* 主时钟：从高饱和黄 + 发光，改为克制的白色等宽大字 */
.sch-clock {
  position: relative;
  z-index: 1;
  display: flex !important;
  justify-content: center;
  align-items: baseline;
  padding: 34px 0 18px !important;
  font-family: var(--font-display) !important;
  font-weight: var(--fw-semi) !important;
  font-size: clamp(48px, 7.2vw, 92px) !important;
  line-height: 1 !important;
  letter-spacing: -0.045em !important;
  color: var(--fg) !important;
  text-shadow: none !important;
  font-variant-numeric: tabular-nums;
  user-select: none;
}
.sch-clock .d { display: inline-block; min-width: 0.6em !important; text-align: center; }
.sch-clock .d.shift { animation: sch-digit 0.22s var(--ease) !important; }
/* 冒号：去掉 1s 闪烁（长时间盯着非常疲劳），改为静态弱化 */
.sch-clock .c {
  color: var(--muted-2) !important;
  opacity: 0.5 !important;
  padding: 0 0.015em !important;
  animation: none !important;
}

.sch-sub {
  text-align: center;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-eyebrow) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: var(--ls-eyebrow) !important;
  color: var(--muted) !important;
  margin-top: 4px !important;
}

/* 进度：危险条纹 → 细线 + 系统蓝渐变 */
.sch-progress {
  position: relative;
  height: 6px !important;
  margin-top: 26px !important;
  border: none !important;
  border-radius: var(--r-pill) !important;
  background: var(--ln-hair) !important;
  overflow: visible !important;
  z-index: 1;
}
.sch-progress-bar {
  height: 100% !important;
  border-radius: var(--r-pill) !important;
  background: linear-gradient(90deg, var(--accent-press), var(--accent)) !important;
  background-image: linear-gradient(90deg, var(--accent-press), var(--accent)) !important;
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 50%, transparent) !important;
  transition: width var(--t-slow) linear !important;
}
.sch-progress-spark {
  position: absolute;
  top: 50%;
  width: 9px !important;
  height: 9px !important;
  margin: -4.5px 0 0 -4.5px !important;
  border-radius: 50% !important;
  background: #fff !important;
  box-shadow: 0 0 10px 2px color-mix(in srgb, var(--accent) 70%, transparent) !important;
  transition: left var(--t-slow) linear !important;
}

.sch-meta {
  display: flex !important;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium);
  letter-spacing: 0 !important;
  color: var(--muted-2) !important;
  margin-top: 16px !important;
  position: relative;
  z-index: 1;
}

/* ---------- 打卡区 / 课表 ---------- */
.sch-checkin-card,
.sch-note-card {
  background: var(--surface) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-lg) !important;
  box-shadow: none !important;
  padding: 26px 28px !important;
}
.sch-note-card textarea {
  background: var(--bg) !important;
  border: 1px solid var(--ln-hair) !important;
  border-radius: var(--r-md) !important;
}

/* 时段标签：实心高饱和块 → 低饱和药丸 */
.sch-tag {
  font-family: var(--font-sans) !important;
  font-size: 11.5px !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: 0.01em !important;
  border-radius: var(--r-pill) !important;
  padding: 3px 10px !important;
  border: none !important;
}
.sch-tag-study { background: color-mix(in srgb, var(--accent) 18%, transparent) !important; color: var(--accent) !important; }
.sch-tag-rest  { background: color-mix(in srgb, var(--ok) 18%, transparent) !important;     color: var(--ok) !important; }
.sch-tag-life  { background: var(--ln-hair) !important;                                     color: var(--fg-2) !important; }
.sch-tag-fun   { background: color-mix(in srgb, var(--danger) 18%, transparent) !important; color: var(--danger) !important; }

/* 课表 */
.sch-table { border-collapse: collapse !important; }
.sch-table th {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-semi) !important;
  letter-spacing: 0.02em !important;
  color: var(--muted) !important;
  border: none !important;
  border-bottom: 1px solid var(--ln-hair) !important;
  padding: 0 14px 12px !important;
}
.sch-table td {
  border: none !important;
  border-bottom: 1px solid var(--ln-hair) !important;
  padding: 15px 14px !important;
  color: var(--fg-2) !important;
}
.sch-table .sch-time {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium);
  color: var(--muted) !important;
  font-variant-numeric: tabular-nums;
}
/* 当前行：从黄色高亮改为左侧强调线 + 淡蓝底 */
.sch-table tr.now td {
  background: var(--accent-soft) !important;
  color: var(--fg) !important;
}
.sch-table tr.now td:first-child {
  box-shadow: inset 2px 0 0 var(--accent);
  animation: none !important;
}

/* 时段切换标签页 → 分段控件 */
.sch-tabs {
  display: inline-flex !important;
  gap: 2px !important;
  padding: 2px;
  border-radius: var(--r-pill);
  background: var(--surface);
  border: 1px solid var(--ln-hair);
}
.sch-tabs button {
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xs) !important;
  font-weight: var(--fw-medium) !important;
  letter-spacing: 0 !important;
  padding: 8px 16px !important;
  border-radius: var(--r-pill) !important;
  border: none !important;
  background: none !important;
  color: var(--muted) !important;
  cursor: pointer;
}
.sch-tabs button:hover { color: var(--fg) !important; border: none !important; }
.sch-tabs button.active {
  background: var(--bg) !important;
  color: var(--fg) !important;
  font-weight: var(--fw-semi) !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18) !important;
}

/* ============================================================
   12. 图像与氛围
   ============================================================ */
/* 图片：圆角 + 裁剪，Apple 式媒体处理 */
.section-inner img:not(.no-round), .page-hero img { border-radius: var(--r-lg); display: block; }

/* 章节之间的细分隔线 */
.section + .section { position: relative; }
.section + .section::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: min(var(--container), calc(100% - var(--gutter) * 2));
  height: 1px;
  background: var(--ln-hair);
}

/* ============================================================
   13. 动效
   ============================================================ */
/* 失败安全：默认完全可见；只有 JS 就绪（html.ae-motion）才启用隐藏态 */
html.ae-motion .ae-reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--t-reveal) var(--ease), transform var(--t-reveal) var(--ease);
  transition-delay: var(--ae-delay, 0ms);
}
html.ae-motion .ae-reveal.ae-in { opacity: 1; transform: none; }

html.ae-motion .ae-kinetic {
  opacity: 0;
  transform: translateY(26px);
  letter-spacing: 0.01em;
}
html.ae-motion .ae-kinetic.ae-in {
  opacity: 1;
  transform: none;
  letter-spacing: var(--ls-display);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease),
    letter-spacing 1000ms var(--ease);
}

/* 媒体缩放揭示（Apple 产品图签名动效） */
.ae-media { overflow: hidden; border-radius: var(--r-lg); }
.ae-media > img, .ae-media > video {
  transform: scale(1.06);
  transition: transform 1100ms var(--ease);
  will-change: transform;
}
.ae-media.ae-in > img, .ae-media.ae-in > video { transform: scale(1); }

/* 卡片指针反馈的容器基础 */
.nc-card, .subject-card, .chapter-card { will-change: transform; }

/* 切换外观的瞬间关闭过渡，避免整页渐变闪烁 */
html.ae-theme-swap,
html.ae-theme-swap *,
html.ae-theme-swap *::before,
html.ae-theme-swap *::after {
  transition: none !important;
  animation: none !important;
}

/* 影像条视差位移（由 motion.js 写入 --ae-shift） */
.manifesto::before {
  transform: translate3d(0, var(--ae-shift, 0px), 0) scale(1.06);
  will-change: transform;
}

/* 顶部滚动进度条 */
.ae-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--accent-press), var(--accent), color-mix(in srgb, var(--brand) 70%, transparent));
  z-index: 9999;
  pointer-events: none;
  will-change: transform;
}

/* ============================================================
   14. 响应式
   ============================================================ */
@media (max-width: 1023px) {
  :root { --section-y: 84px; }
  .nav-menu { display: none !important; }
  .nav-burger { display: inline-grid !important; }
  .hero-inner { grid-template-columns: minmax(0, 1fr); min-height: 0; gap: 40px; }
  .nc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
  .subject-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
  .mega-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  :root { --section-y: 64px; --gutter: 16px; --fs-body: 16px; }
  .nav-inner { gap: 10px; }
  .nav-logo { font-size: 14px !important; }
  .nc-grid, .subject-grid { grid-template-columns: minmax(0, 1fr) !important; }
  .nc-card { min-height: 0; padding: 26px 22px 24px !important; }
  .nc-icon { margin-bottom: 24px; }
  .subject-card { padding: 26px 22px 24px !important; }
  .card-icon { margin-bottom: 20px; }
  .hero-inner { padding-top: 56px; padding-bottom: 56px; }
  .page-hero { padding-top: 64px !important; }
  .section-head { text-align: left; }
  .section-head p { margin-left: 0; margin-right: 0; }
  .mega-grid, .mega-cols { grid-template-columns: 1fr; }
  .footer-nav { gap: 8px 18px; }
  .btn-primary, .btn-ghost { min-height: 44px; }
  /* 手机端隐藏主题切换图标（改由抽屉与页脚承担），避免导航过挤 */
  .nav-actions > .ae-theme-toggle { display: none !important; }
}

/* ============================================================
   15. 无障碍：尊重「减弱动态效果」
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html.ae-motion .ae-reveal,
  html.ae-motion .ae-kinetic { opacity: 1 !important; transform: none !important; letter-spacing: normal !important; }
  .ae-media > img, .ae-media > video { transform: none !important; }
  .ae-progress { display: none !important; }
  .manifesto::before { transform: none !important; }
}

/* 强制对比度模式 */
@media (prefers-contrast: more) {
  :root { --ln-hair: rgba(255, 255, 255, 0.28); --muted: #c7c7cc; }
  html[data-theme="light"] { --ln-hair: rgba(0, 0, 0, 0.3); --muted: #424245; }
}