/* =====================================================================
   家庭教育场景卡库 · 全局样式
   设计语言：莫兰迪低饱和 · 优雅克制 · 柔和过渡 · 大量留白
   ===================================================================== */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* —— 莫兰迪配色（严格按视觉规范定义） —— */
  --c-primary: #994882;
  --c-accent: #ab5f72;
  --c-cta: #5eba45;
  --c-bg: #fbf8fb;
  --c-surface: #ffffff;
  --c-text: #2c1b27;
  --c-text-secondary: #7a5c72;
  --c-border: #e6dbe3;

  /* 由规范色板派生的柔和浅底与深一档文字色（仅作填充/强调，色相源于规范色） */
  --c-primary-soft: rgba(153, 72, 130, 0.08);
  --c-primary-mid: rgba(153, 72, 130, 0.16);
  --c-primary-deep: #7d3a6b;
  --c-accent-soft: rgba(171, 95, 114, 0.10);
  --c-accent-deep: #8f4c5e;
  --c-cta-soft: rgba(94, 186, 69, 0.10);
  --c-cta-deep: #3f6f31;
  --c-cta-border: rgba(94, 186, 69, 0.5);

  --radius: 14px;
  --font-serif: 'Noto Serif SC', 'Songti SC', Georgia, 'Times New Roman', serif;
  --font-sans: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;

  --shadow-soft: 0 1px 2px rgba(44, 27, 39, 0.04), 0 14px 34px -18px rgba(44, 27, 39, 0.14);
  --shadow-hover: 0 2px 6px rgba(44, 27, 39, 0.06), 0 24px 48px -20px rgba(44, 27, 39, 0.2);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* —— 极淡噪点，全页覆盖，克制而不喧宾 —— */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='180'%20height='180'%3E%3Cfilter%20id='n'%3E%3CfeTurbulence%20type='fractalNoise'%20baseFrequency='0.82'%20numOctaves='2'%20stitchTiles='stitch'/%3E%3CfeColorMatrix%20type='saturate'%20values='0'/%3E%3C/filter%3E%3Crect%20width='100%25'%20height='100%25'%20filter='url(%23n)'%20opacity='0.04'/%3E%3C/svg%3E");
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--c-primary-mid); color: var(--c-text); }

:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: min(1180px, 92%);
  margin-inline: auto;
}
.container.narrow { width: min(860px, 92%); }

main { flex: 1; position: relative; z-index: 1; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius) 0;
  z-index: 100;
  font-size: 14px;
}
.skip-link:focus { left: 0; }

/* =====================================================================
   页头
   ===================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 248, 251, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 0;
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  display: grid;
  place-items: center;
  box-shadow: 0 6px 14px -8px rgba(153, 72, 130, 0.7);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-text);
}

.main-nav { display: flex; align-items: center; gap: 6px; }

.nav-link {
  position: relative;
  padding: 8px 15px;
  font-size: 14.5px;
  color: var(--c-text-secondary);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: color 0.22s ease, background 0.22s ease;
}
.nav-link:hover { color: var(--c-primary); background: var(--c-primary-soft); }
.nav-link.active { color: var(--c-primary); background: var(--c-primary-soft); font-weight: 600; }

.fav-count {
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--c-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  line-height: 18px;
  text-align: center;
}

/* =====================================================================
   视图切换
   ===================================================================== */
.view { animation: view-in 0.45s ease both; }
.view[hidden] { display: none; }

@keyframes view-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* =====================================================================
   首页英雄区
   ===================================================================== */
.hero {
  position: relative;
  padding: 78px 0 48px;
  text-align: center;
  overflow: hidden;
}

/* 极淡的一抹主色光晕 + 温柔侧光，克制的装饰 */
.hero::before {
  content: "";
  position: absolute;
  top: -160px;
  left: 50%;
  transform: translateX(-50%);
  width: 720px;
  height: 420px;
  background: radial-gradient(closest-side, rgba(153, 72, 130, 0.07), transparent 72%);
  pointer-events: none;
  z-index: -1;
}
.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -120px;
  width: 360px;
  height: 360px;
  background: radial-gradient(closest-side, rgba(171, 95, 114, 0.06), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

.hero-eyebrow {
  font-size: 12px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--c-text-secondary);
}

.hero-title {
  margin-top: 24px;
  font-family: var(--font-serif);
  font-size: clamp(31px, 5.2vw, 48px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.hero-rule {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 26px auto 0;
  width: 120px;
}
.hero-rule::before,
.hero-rule::after {
  content: "";
  height: 1px;
  width: 46px;
  background: var(--c-border);
}
.hero-rule span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-primary);
  opacity: 0.65;
}

.hero-lead {
  max-width: 660px;
  margin: 22px auto 0;
  font-size: 15.5px;
  color: var(--c-text-secondary);
}

.hero-stats {
  display: flex;
  justify-content: center;
  margin-top: 44px;
  border-top: 1px solid var(--c-border);
}
.hero-stat {
  padding: 24px 46px;
  border-left: 1px solid var(--c-border);
}
.hero-stat:first-child { border-left: 0; }
.hero-stat b {
  display: block;
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1.2;
}
.hero-stat span {
  font-size: 12.5px;
  color: var(--c-text-secondary);
  letter-spacing: 0.06em;
}

/* =====================================================================
   子页面头部（收藏夹 / 关于）
   ===================================================================== */
.page-head {
  padding: 64px 0 30px;
  text-align: center;
}
.page-eyebrow {
  font-size: 12px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--c-text-secondary);
}
.page-title {
  margin-top: 18px;
  font-family: var(--font-serif);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: 0.03em;
}
.page-lead {
  margin: 14px auto 0;
  max-width: 560px;
  font-size: 15px;
  color: var(--c-text-secondary);
}

/* =====================================================================
   筛选工具栏
   ===================================================================== */
.toolbar {
  padding: 28px 30px 22px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  box-shadow: var(--shadow-soft);
}

.toolbar-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 8px 0;
}
.toolbar-row + .toolbar-row { border-top: 1px dashed var(--c-border); margin-top: 8px; }

.toolbar-label {
  flex: 0 0 auto;
  width: 58px;
  padding-top: 9px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--c-text-secondary);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.chip {
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text-secondary);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 13.5px;
  line-height: 1.4;
  transition: border-color 0.22s ease, color 0.22s ease, background 0.22s ease, box-shadow 0.22s ease, transform 0.15s ease;
}
.chip:hover:not(.active) { border-color: var(--c-primary); color: var(--c-primary); }
.chip:active { transform: scale(0.97); }
.chip.active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
  box-shadow: 0 8px 16px -10px rgba(153, 72, 130, 0.65);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 1;
  max-width: 420px;
  padding: 8px 14px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  color: var(--c-text-secondary);
  background: var(--c-bg);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}
.search-box:focus-within {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-soft);
}
.search-box input {
  flex: 1;
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: 14px;
  color: var(--c-text);
  outline: none;
}
.search-box input::placeholder { color: var(--c-text-secondary); opacity: 0.7; }
.search-box input::-webkit-search-cancel-button { -webkit-appearance: none; }

/* =====================================================================
   结果行
   ===================================================================== */
.result-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-top: 40px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-border);
}
.result-line h2 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.result-count {
  font-size: 13px;
  color: var(--c-text-secondary);
}

/* =====================================================================
   卡片瀑布流（CSS Grid 分栏 + JS 均衡分配）
   ===================================================================== */
.gallery { padding: 28px 0 96px; }

.grid {
  display: grid;
  grid-template-columns: repeat(var(--cols, 3), 1fr);
  gap: 24px;
  align-items: start;
}

.grid-col {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

/* —— 卡片本体 —— */
.card {
  display: flex;
  flex-direction: column;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px);
  animation: card-in 0.55s ease forwards;
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(153, 72, 130, 0.35);
}

@keyframes card-in {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  padding: 18px 20px 0;
}

.card-chips { display: flex; flex-wrap: wrap; gap: 7px; }

.chip-type {
  background: var(--c-primary-soft);
  border-color: transparent;
  color: var(--c-primary);
  font-size: 12px;
  padding: 4px 11px;
}
.chip-age {
  background: transparent;
  color: var(--c-text-secondary);
  font-size: 12px;
  padding: 4px 11px;
}

.fav-btn {
  flex: 0 0 auto;
  background: none;
  border: 0;
  padding: 6px;
  line-height: 0;
  border-radius: 999px;
  color: var(--c-text-secondary);
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.fav-btn:hover { background: var(--c-accent-soft); transform: scale(1.1); }
.fav-btn svg { width: 20px; height: 20px; }
.fav-btn svg path {
  fill: transparent;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linejoin: round;
  transition: fill 0.25s ease;
}
.fav-btn.is-fav { color: var(--c-accent); }
.fav-btn.is-fav svg path { fill: var(--c-accent); }
.fav-btn.pop { animation: heart-pop 0.4s ease; }

@keyframes heart-pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.4) rotate(-10deg); }
  70% { transform: scale(0.9); }
  100% { transform: scale(1); }
}

.card-title {
  margin: 14px 20px 6px;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.card-desc {
  margin: 0 20px;
  font-size: 14px;
  color: var(--c-text-secondary);
}

/* —— 卡片内容块 —— */
.block {
  margin: 14px 20px 0;
  border-radius: 12px;
  padding: 12px 14px;
}
.block-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
}
.block-title svg { width: 14px; height: 14px; flex: 0 0 auto; }
.block-text { margin-top: 6px; font-size: 14px; line-height: 1.8; }

.block-wrong {
  background: var(--c-accent-soft);
  border: 1px solid rgba(171, 95, 114, 0.16);
}
.block-wrong .block-title { color: var(--c-accent-deep); }
.block-wrong .block-text { color: var(--c-text-secondary); }

.block-right {
  background: var(--c-cta-soft);
  border-left: 3px solid var(--c-cta);
  border-radius: 4px 12px 12px 4px;
}
.block-right .block-title { color: var(--c-cta-deep); }
.block-right .block-text {
  color: var(--c-cta-deep);
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.85;
}

.block-psych {
  background: var(--c-primary-soft);
  border: 1px dashed var(--c-primary-mid);
}
.block-psych .block-title { color: var(--c-primary); }
.block-psych .block-text { color: var(--c-text-secondary); }

/* —— 要点回顾 —— */
.card-tips {
  margin: 16px 20px 0;
  border-top: 1px dashed var(--c-border);
  padding-top: 12px;
}
.tips-title {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--c-text-secondary);
}
.tips-list {
  list-style: none;
  margin-top: 8px;
  display: grid;
  gap: 6px;
}
.tips-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.7;
}
.tips-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.78em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-primary);
  opacity: 0.55;
}

/* —— 卡片底部 —— */
.card-foot {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 20px;
  border-top: 1px solid var(--c-border);
  background: #fcf9fc;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  line-height: 1.2;
  padding: 10px 20px;
  transition: transform 0.18s ease, box-shadow 0.22s ease, background 0.22s ease, border-color 0.22s ease, color 0.22s ease;
}
.btn:active { transform: scale(0.97); }

.btn-copy {
  background: var(--c-cta-soft);
  border-color: var(--c-cta-border);
  color: var(--c-cta-deep);
  font-size: 13px;
  padding: 8px 16px;
}
.btn-copy svg { width: 15px; height: 15px; }
.btn-copy:hover { background: var(--c-cta); border-color: var(--c-cta); color: #fff; box-shadow: 0 10px 18px -12px rgba(94, 186, 69, 0.8); }
.btn-copy.done { background: var(--c-cta); border-color: var(--c-cta); color: #fff; }

.btn-fav {
  background: none;
  border: 0;
  font-size: 13px;
  color: var(--c-text-secondary);
  padding: 8px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease, background 0.2s ease;
}
.btn-fav:hover { color: var(--c-accent); background: var(--c-accent-soft); }
.btn-fav.is-fav { color: var(--c-accent); font-weight: 600; }

.btn-outline {
  background: var(--c-surface);
  border-color: var(--c-border);
  color: var(--c-text-secondary);
}
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }

.btn-cta {
  background: var(--c-cta);
  border-color: var(--c-cta);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 12px 22px -14px rgba(94, 186, 69, 0.85);
}
.btn-cta:hover { background: #4f9c3b; box-shadow: 0 16px 28px -14px rgba(94, 186, 69, 0.9); }

/* =====================================================================
   空状态
   ===================================================================== */
.empty-state {
  text-align: center;
  padding: 72px 24px;
  border: 1px dashed var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  box-shadow: var(--shadow-soft);
}
.empty-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(153, 72, 130, 0.14), transparent 60%),
    var(--c-primary-soft);
  border: 1px solid var(--c-primary-mid);
  position: relative;
}
.empty-mark::before,
.empty-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border: 1.5px solid var(--c-primary);
  border-radius: 999px;
  opacity: 0.55;
}
.empty-mark::before { width: 22px; height: 22px; }
.empty-mark::after { width: 34px; height: 34px; }

.empty-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--c-text);
}
.empty-desc {
  margin: 10px auto 0;
  max-width: 380px;
  font-size: 14px;
  color: var(--c-text-secondary);
}
.empty-state .btn,
.empty-state .btn-cta {
  margin-top: 24px;
}

/* =====================================================================
   关于页
   ===================================================================== */
.about-body { padding: 8px 0 96px; }
.about-intro { font-size: 15.5px; color: var(--c-text-secondary); }

.about-body h2 {
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--c-primary);
  line-height: 1.4;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.principle {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 24px 22px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.principle:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.principle-num {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-primary);
  opacity: 0.8;
}
.principle h3 {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
}
.principle p { margin-top: 8px; font-size: 13.5px; color: var(--c-text-secondary); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.step {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.step-num {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--c-accent);
  opacity: 0.85;
}
.step h3 { margin-top: 8px; font-family: var(--font-serif); font-size: 16px; font-weight: 600; }
.step p { margin-top: 8px; font-size: 13.5px; color: var(--c-text-secondary); }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.stat-box {
  text-align: center;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 16px;
  box-shadow: var(--shadow-soft);
}
.stat-box strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 700;
  color: var(--c-primary);
}
.stat-box span { font-size: 12.5px; color: var(--c-text-secondary); letter-spacing: 0.06em; }

.note-box {
  margin-top: 46px;
  background: var(--c-primary-soft);
  border: 1px solid var(--c-primary-mid);
  border-radius: var(--radius);
  padding: 20px 24px;
  font-size: 14px;
  color: var(--c-text-secondary);
}
.note-box strong { color: var(--c-primary); }

.about-cta { margin-top: 34px; text-align: center; }

/* =====================================================================
   页脚
   ===================================================================== */
.site-footer {
  border-top: 1px solid var(--c-border);
  padding: 38px 0 32px;
  text-align: center;
  position: relative;
  z-index: 1;
  background: var(--c-bg);
}
.footer-note {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--c-text);
  letter-spacing: 0.04em;
}
.footer-nav {
  margin-top: 14px;
  display: flex;
  justify-content: center;
  gap: 26px;
  font-size: 13px;
}
.footer-nav a { color: var(--c-text-secondary); transition: color 0.2s ease; }
.footer-nav a:hover { color: var(--c-primary); }
.footer-legal { margin-top: 14px; font-size: 12px; color: var(--c-text-secondary); opacity: 0.85; }

/* =====================================================================
   Toast
   ===================================================================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%) translateY(12px);
  z-index: 90;
  background: var(--c-text);
  color: #fdf8fb;
  font-size: 14px;
  padding: 11px 22px;
  border-radius: 999px;
  box-shadow: 0 18px 40px -14px rgba(44, 27, 39, 0.5);
  opacity: 0;
  transition: opacity 0.28s ease, transform 0.28s ease;
  pointer-events: none;
  max-width: min(88vw, 480px);
  text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* =====================================================================
   响应式
   ===================================================================== */
@media (max-width: 980px) {
  .principles { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr 1fr; }
  .hero-stat { padding: 20px 30px; }
}

@media (max-width: 720px) {
  .header-inner { flex-direction: column; gap: 10px; padding: 14px 0; }
  .hero { padding: 56px 0 40px; }
  .page-head { padding: 48px 0 24px; }
  .toolbar { padding: 20px 18px 16px; }
  .toolbar-row { flex-direction: column; gap: 8px; }
  .toolbar-label { width: auto; padding-top: 0; }
  .search-box { max-width: none; }
  .result-line { flex-direction: column; gap: 4px; margin-top: 30px; }
  .hero-stats { flex-wrap: wrap; }
  .hero-stat { border-left: 0; padding: 16px 26px; }
  .principles { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
  .gallery { padding-bottom: 64px; }
}

@media (max-width: 480px) {
  .brand-name { font-size: 15.5px; }
  .nav-link { padding: 7px 11px; font-size: 13.5px; }
  .stats { grid-template-columns: 1fr; }
  .stat-box { padding: 18px 12px; }
}

/* =====================================================================
   动效偏好
   ===================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .card { opacity: 1; transform: none; }
}