/* =========================================================
   CCVB · site.css
   完整版：CSS 变量 + 暗/亮主题 + 4 块张力区 + 阅读进度 + a11y
   ========================================================= */

/* ---------- 设计令牌（暗色 / 默认） ---------- */
:root,
[data-theme="dark"] {
  /* 中性色 */
  --color-bg:       #050505;
  --color-bg-soft:  #0a0a0a;
  --color-bg-card:  #0f172a;
  --color-ink:      #f5f5f5;
  --color-text:     #cbd5e1;
  --color-muted:    #94a3b8;
  --color-line:     rgba(255,255,255,.10);

  /* 4 块强调色（与张力叙事一致） */
  --accent-curiosity: #5b8def;
  --accent-courage:   #ef4444;
  --accent-vitality:  #f59e0b;
  --accent-belief:    #14b8a6;

  /* 渐变（hero 用） */
  --hero-gradient: linear-gradient(120deg, #5b8def, #ef4444 50%, #f59e0b 90%);

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.5);
  --shadow-md: 0 6px 20px rgba(0,0,0,.6);
  --shadow-lg: 0 20px 50px rgba(0,0,0,.7);

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  /* 字体栈 */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  /* 展示字体：几何特粗无衬线，用于品牌字标，增强张力与国际感（按系统本地取，不依赖网络） */
  --font-display: "Arial Black", "Avenir Next Heavy", "Avenir Next",
                  "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Consolas", monospace;
}

/* ---------- 亮色主题 ---------- */
[data-theme="light"] {
  --color-bg:       #fafafa;
  --color-bg-soft:  #f1f5f9;
  --color-bg-card:  #ffffff;
  --color-ink:      #0f172a;
  --color-text:     #334155;
  --color-muted:    #64748b;
  --color-line:     rgba(15,23,42,.10);

  --accent-curiosity: #3b6fd6;
  --accent-courage:   #dc2626;
  --accent-vitality:  #d97706;
  --accent-belief:    #0d9488;

  --hero-gradient: linear-gradient(120deg, #3b6fd6, #dc2626 50%, #d97706 90%);

  --shadow-sm: 0 1px 2px rgba(15,23,42,.06);
  --shadow-md: 0 6px 20px rgba(15,23,42,.08);
  --shadow-lg: 0 20px 50px rgba(15,23,42,.12);
}

/* ---------- 跟随系统（默认仍是暗色） ---------- */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background .3s ease, color .3s ease;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ---------- 可访问性：Skip Link ---------- */
.skip-link {
  position: absolute;
  top: -100px; left: 16px;
  z-index: 1000;
  padding: 12px 20px;
  background: var(--color-ink);
  color: var(--color-bg);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: top .2s;
}
.skip-link:focus { top: 16px; outline: 3px solid var(--accent-curiosity); outline-offset: 2px; }

/* ---------- 可访问性：Focus 样式 ---------- */
*:focus-visible {
  outline: 3px solid var(--accent-curiosity);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 阅读进度条 ---------- */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 3px;
  background: var(--hero-gradient);
  z-index: 200;
  transition: width .1s linear;
  will-change: width;
}

/* ---------- 顶部导航（统一） ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 32px;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background .3s, box-shadow .25s;
}
.nav.scrolled { border-color: var(--color-line); box-shadow: var(--shadow-sm); }
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 23px;
  letter-spacing: .3em;
  line-height: 1;
  text-transform: uppercase;
  color: var(--color-ink);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  position: relative;
  padding: 6px 0;
  transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-ink); }
.nav-links a.active::after {
  content: ""; position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--color-ink);
}
.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--color-ink);
  color: var(--color-bg) !important;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  transition: transform .2s;
}
.nav-cta:hover { transform: translateY(-1px); }

/* 主题切换器 */
.theme-toggle {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  color: var(--color-muted);
  transition: color .2s, background .2s;
}
.theme-toggle:hover { color: var(--color-ink); background: var(--color-line); }
.theme-toggle svg { width: 18px; height: 18px; }
[data-theme="dark"] .theme-toggle .icon-sun,
:root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
:root:not([data-theme="dark"]) .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
:root:not([data-theme="light"]) .theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* 移动端汉堡 */
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block; width: 22px; height: 2px;
  background: var(--color-ink);
  position: relative;
  transition: transform .25s;
}
.nav-toggle span::before { content: ""; position: absolute; top: -7px; left: 0; }
.nav-toggle span::after  { content: ""; position: absolute; top:  7px; left: 0; }
.nav-toggle.is-open span { background: transparent; }
.nav-toggle.is-open span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span::after  { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav { padding: 0 20px; }
  .nav-links {
    position: absolute;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    padding: 8px 0;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 14px 24px; }
  .nav-links a.active::after { display: none; }
  .nav-cta-wrap { display: none; }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 120px 32px 64px;
  background: var(--color-bg);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, color-mix(in srgb, var(--color-ink) 6%, transparent), transparent 60%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 2; max-width: 1280px; margin: 0 auto; width: 100%; }
.hero-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 64px;
}
.hero-mid { position: relative; }
.brand-wordmark {
  font-family: var(--font-display);
  font-size: clamp(64px, 11vw, 190px);
  font-weight: 900;
  line-height: .9;
  letter-spacing: -.015em;
  text-transform: uppercase;
  background: linear-gradient(115deg, var(--accent-curiosity) 0%, var(--accent-courage) 36%, var(--accent-vitality) 66%, var(--accent-belief) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 8px;
  filter: drop-shadow(0 10px 30px rgba(0,0,0,.18));
}
.hero-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--accent-curiosity);
  background: color-mix(in srgb, var(--accent-curiosity) 12%, transparent);
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
}
.hero-mid h1 {
  font-size: clamp(40px, 6vw, 96px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--color-ink);
  max-width: 900px;
}
.hero-mid h1 em {
  font-style: italic;
  font-weight: 300;
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  margin-top: 24px;
  max-width: 600px;
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--color-muted);
  line-height: 1.6;
}
.hero-actions {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.hero-foot {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  position: relative;
  z-index: 2;
  margin-top: 80px;
}
.hero-scroll {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero-scroll::before { content: "↓"; animation: bob 1.6s ease-in-out infinite; }
@keyframes bob { 0%,100% { transform: translateY(0); opacity: .6; } 50% { transform: translateY(4px); opacity: 1; } }
.hero-meta {
  display: flex;
  gap: 36px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero-meta .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-curiosity); }

@media (max-width: 768px) {
  .hero { padding: 96px 20px 48px; }
  .hero-foot { flex-direction: column; align-items: flex-start; gap: 16px; }
  .hero-meta { gap: 16px; }
  .brand-wordmark { font-size: clamp(52px, 22vw, 120px); }
}

/* ---------- 通用 Block（全屏张力区） ---------- */
.block {
  position: relative;
  min-height: 100vh;
  padding: 120px 32px 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  isolation: isolate;
}
@media (max-width: 768px) { .block { padding: 96px 20px 64px; } }

.block-ghost {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 0;
  pointer-events: none;
}
.block-ghost span {
  font-size: clamp(220px, 38vw, 640px);
  font-weight: 900;
  line-height: .85;
  letter-spacing: -.05em;
  color: currentColor;
  opacity: .04;
  white-space: nowrap;
  text-transform: uppercase;
  user-select: none;
  transform: translateY(-2%);
}

.block-num {
  position: absolute;
  top: 96px; left: 32px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--color-muted);
  z-index: 2;
}
@media (max-width: 768px) { .block-num { top: 80px; left: 20px; } }

.block-side {
  position: absolute;
  right: 32px;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: right center;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .35em;
  text-transform: uppercase;
  color: var(--color-muted);
  white-space: nowrap;
  z-index: 2;
}
@media (max-width: 768px) { .block-side { display: none; } }

.block-arrow {
  position: absolute;
  bottom: 32px; left: 32px;
  font-size: 11px;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--color-muted);
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 8px;
}
.block-arrow::before {
  content: "↓";
  display: inline-block;
  animation: bob 1.6s ease-in-out infinite;
}
@media (max-width: 768px) { .block-arrow { left: 20px; bottom: 24px; } }

.block-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}
.block-eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 32px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .8s .1s ease, transform .8s .1s ease;
}
.block-word {
  font-size: clamp(72px, 14vw, 220px);
  font-weight: 900;
  line-height: .85;
  letter-spacing: -.045em;
  color: #fff;
  margin-bottom: 48px;
  position: relative;
  overflow: hidden;
}
[data-theme="light"] .block-word { color: var(--color-ink); }
.block-word > span {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1s cubic-bezier(.16, 1, .3, 1);
}
.block-word > span:nth-child(1) { transition-delay: .1s; }
.block-word > span:nth-child(2) { transition-delay: .25s; }
.block-word > span:nth-child(3) { transition-delay: .4s; }
.block-word .dot {
  color: var(--accent);
  margin-left: 8px;
}
.block-manifesto {
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 400;
  line-height: 1.35;
  color: #fff;
  max-width: 760px;
  margin-bottom: 18px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s .55s ease, transform .9s .55s ease;
}
[data-theme="light"] .block-manifesto { color: var(--color-ink); }
.block-cn {
  font-size: clamp(15px, 1.2vw, 17px);
  color: var(--color-muted);
  letter-spacing: .04em;
  max-width: 640px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s .7s ease, transform .9s .7s ease;
}
.block.is-visible .block-eyebrow,
.block.is-visible .block-manifesto,
.block.is-visible .block-cn { opacity: 1; transform: none; }
.block.is-visible .block-word > span { transform: translateY(0); }

.divider-line {
  width: 64px; height: 2px;
  background: var(--accent);
  margin: 56px 0 32px;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 1s .85s cubic-bezier(.16, 1, .3, 1);
}
.block.is-visible .divider-line { transform: scaleX(1); }

/* ---------- 4 块独立色调 ---------- */

/* 1. Curiosity */
.block-curiosity {
  background: radial-gradient(ellipse at 30% 40%, #0e1a3d 0%, #050816 70%);
  color: var(--accent-curiosity);
  --accent: var(--accent-curiosity);
}
.block-curiosity::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(2px 2px at 12% 22%, rgba(255,255,255,.7), transparent 60%),
    radial-gradient(1.5px 1.5px at 35% 78%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(2px 2px at 68% 30%, rgba(255,255,255,.6), transparent 60%),
    radial-gradient(1px 1px at 82% 64%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(1.5px 1.5px at 50% 50%, rgba(255,255,255,.4), transparent 60%);
  z-index: 0;
}

/* 2. Courage */
.block-courage {
  background: radial-gradient(ellipse at 70% 50%, #4a0a0a 0%, #1a0303 70%);
  color: var(--accent-courage);
  --accent: var(--accent-courage);
}
.block-courage::after {
  content: ""; position: absolute;
  left: -10%; right: -10%;
  top: 35%; height: 30%;
  background: linear-gradient(180deg, transparent, rgba(239,68,68,.35), transparent);
  filter: blur(40px);
  z-index: 0;
}

/* 3. Vitality */
.block-vitality {
  background: radial-gradient(ellipse at 50% 30%, #2d1d05 0%, #0e0900 80%);
  color: var(--accent-vitality);
  --accent: var(--accent-vitality);
}
.block-vitality .block-ghost span {
  background: linear-gradient(180deg, rgba(245,158,11,.18), rgba(245,158,11,.02));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 1;
}

/* 4. Belief */
.block-belief {
  background: radial-gradient(ellipse at 50% 45%, #08383a 0%, #021214 80%);
  color: var(--accent-belief);
  --accent: var(--accent-belief);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all .2s;
  white-space: nowrap;
  cursor: pointer;
}
.btn-primary {
  background: var(--color-ink);
  color: var(--color-bg);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-line);
}
.btn-ghost:hover { border-color: var(--color-ink); }
.btn-lg { padding: 16px 32px; font-size: 16px; }

/* ---------- 卡片（关于/服务页） ---------- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all .3s;
}
.card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.card-icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent-curiosity) 10%, transparent);
  color: var(--accent-curiosity);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: 22px;
}
.card h3 { font-size: 19px; font-weight: 600; margin-bottom: 8px; color: var(--color-ink); }
.card p { font-size: 15px; color: var(--color-muted); line-height: 1.65; }

/* ---------- Section（多页通用） ---------- */
.section { padding: 96px 0; }
@media (max-width: 768px) { .section { padding: 64px 0; } }
.section .container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 768px) { .section .container { padding: 0 20px; } }
.sec-head { max-width: 720px; margin-bottom: 56px; }
.sec-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--accent-curiosity);
  margin-bottom: 14px;
}
.sec-head h2 {
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.2;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--color-ink);
}
.sec-head p {
  margin-top: 16px;
  font-size: 17px;
  color: var(--color-muted);
  line-height: 1.6;
}
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- 品牌价值区（首页可编辑区块 type=values） ---------- */
.brand-values {
  padding: 120px 0;
  border-top: 1px solid var(--color-line);
}
.brand-values .container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 768px) { .brand-values { padding: 72px 0; } .brand-values .container { padding: 0 20px; } }
.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
@media (max-width: 960px) { .values-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .values-grid { grid-template-columns: 1fr; } }
.value-card {
  position: relative;
  padding: 32px 26px 30px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-bg-soft);
  overflow: hidden;
  transition: transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.value-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: var(--card-accent, var(--accent-curiosity));
}
.value-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-accent, var(--accent-curiosity));
  box-shadow: var(--shadow-md);
}
.value-card[data-accent="curiosity"] { --card-accent: var(--accent-curiosity); }
.value-card[data-accent="courage"]   { --card-accent: var(--accent-courage); }
.value-card[data-accent="vitality"]  { --card-accent: var(--accent-vitality); }
.value-card[data-accent="belief"]    { --card-accent: var(--accent-belief); }
.value-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--card-accent, var(--accent-curiosity));
  margin-bottom: 18px;
}
.value-word {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.1;
  color: var(--color-ink);
}
.value-zh {
  margin-top: 4px;
  font-size: 14px;
  letter-spacing: .18em;
  color: var(--color-muted);
}
.value-desc {
  margin-top: 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text);
}

/* ---------- 行动号召（首页可编辑区块 type=cta） ---------- */
.home-cta {
  padding: 104px 0;
  text-align: center;
  border-top: 1px solid var(--color-line);
  background: var(--color-bg-soft);
}
.home-cta .container { max-width: 820px; margin: 0 auto; padding: 0 32px; }
.home-cta h2 {
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--color-ink);
}
.home-cta p {
  margin-top: 16px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-muted);
}
.home-cta-actions {
  margin-top: 34px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 数字条（首页可编辑区块 type=stats） ---------- */
.home-stats { padding: 96px 0; border-top: 1px solid var(--color-line); }
.home-stats .container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.home-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
@media (max-width: 860px) { .home-stats-grid { grid-template-columns: repeat(2, 1fr); } }
.home-stat-num {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--color-ink);
}
.home-stat-label {
  margin-top: 10px;
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--color-muted);
}

/* ---------- 分享浮窗 ---------- */
.share-float {
  position: fixed;
  right: 24px; bottom: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 8px;
  box-shadow: var(--shadow-md);
}
.share-float button {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  color: var(--color-muted);
  transition: color .2s, background .2s, transform .2s;
  font-size: 16px;
}
.share-float button:hover {
  color: var(--color-ink);
  background: var(--color-line);
  transform: scale(1.08);
}
.share-float .label-tip {
  position: absolute;
  right: 56px;
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}
.share-float button:hover .label-tip { opacity: 1; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(8px);
  z-index: 100;
  padding: 12px 20px;
  background: var(--color-ink);
  color: var(--color-bg);
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: opacity .25s, transform .25s;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-soft);
  color: var(--color-muted);
  padding: 80px 0 32px;
  border-top: 1px solid var(--color-line);
}
.footer .container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-line);
}
@media (max-width: 880px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand p {
  margin-top: 16px;
  max-width: 320px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.6;
}
.footer h4 {
  color: var(--color-ink);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: .04em;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { font-size: 14px; color: var(--color-muted); transition: color .2s; }
.footer a:hover { color: var(--color-ink); }
.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--color-muted);
}
.footer-bottom .links { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- 表单（联系 / 订阅） ---------- */
.form-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}
@media (max-width: 640px) { .form-card { padding: 28px; } }
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.field label .req { color: var(--accent-courage); margin-left: 2px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink);
  font: inherit;
  font-size: 15px;
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent-curiosity);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-curiosity) 20%, transparent);
}
.field textarea { min-height: 130px; resize: vertical; line-height: 1.6; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }
.form-msg {
  display: none;
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
}
.form-msg.ok  { display: block; background: color-mix(in srgb, #10b981 12%, transparent); color: #059669; border: 1px solid color-mix(in srgb, #10b981 30%, transparent); }
.form-msg.err { display: block; background: color-mix(in srgb, var(--accent-courage) 12%, transparent); color: var(--accent-courage); border: 1px solid color-mix(in srgb, var(--accent-courage) 30%, transparent); }
[data-theme="dark"] .form-msg.ok  { color: #6ee7b7; }
[data-theme="dark"] .form-msg.err { color: #fca5a5; }

/* ---------- Loading 占位 ---------- */
.is-loading .block-content > *,
.is-loading .hero-mid > *,
.is-loading .footer > * { visibility: hidden; }
.is-loading::after {
  content: "Loading…";
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 12px;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--color-muted);
  z-index: 300;
  pointer-events: none;
  background: var(--color-bg);
}

/* ---------- 时间线（关于页） ---------- */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ""; position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 2px;
  background: var(--color-line);
}
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
  content: ""; position: absolute;
  left: -28px; top: 6px;
  width: 12px; height: 12px;
  background: var(--accent-curiosity);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--color-bg), 0 0 0 5px var(--accent-curiosity);
}
.timeline-year {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-curiosity);
  letter-spacing: .04em;
}
.timeline-item h3 {
  margin-top: 6px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}
.timeline-item p { margin-top: 6px; font-size: 15px; color: var(--color-muted); }

/* ---------- 错误页（404） ---------- */
.error-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 120px 32px 80px;
  text-align: center;
  background: var(--color-bg);
}
.error-page .num {
  font-size: clamp(120px, 22vw, 280px);
  font-weight: 900;
  line-height: .85;
  letter-spacing: -.04em;
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.error-page h1 {
  margin-top: 16px;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 700;
  color: var(--color-ink);
}
.error-page p {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
  max-width: 480px;
}
.error-page .actions {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Reveal 动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 工具类 ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}