/* 牵伴宠物科技官网 —— 科技感 × 人文暖色 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&family=Sora:wght@400;500;600;700&display=swap');

:root {
  --color-primary: #d97706;
  --color-primary-dark: #b45309;
  --color-primary-soft: rgba(217, 119, 6, 0.12);
  --color-accent: #ea580c;
  --color-bg: #f4f1ec;
  --color-bg-deep: #ebe6df;
  --color-surface: #ffffff;
  --color-text: #1c1917;
  --color-text-muted: #78716c;
  --color-border: #e4ddd3;
  --color-line: rgba(217, 119, 6, 0.18);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 0 rgba(28, 25, 23, 0.04), 0 8px 24px rgba(28, 25, 23, 0.04);
  --font-sans: 'Sora', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --font-display: 'Sora', 'Noto Sans SC', sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background:
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-deep) 100%);
  color: var(--color-text);
  line-height: 1.65;
  letter-spacing: 0.01em;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    linear-gradient(var(--color-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
  opacity: 0.7;
}

a { color: var(--color-primary-dark); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--color-accent); }
img, svg { max-width: 100%; vertical-align: middle; }
.container { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 241, 236, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.brand:hover { color: var(--color-text); }
.brand-icon { width: 26px; height: 26px; fill: var(--color-primary); }
.site-nav { display: flex; flex-wrap: wrap; gap: 2px; }
.site-nav a {
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
}
.site-nav a:hover { background: var(--color-primary-soft); color: var(--color-text); }
.site-nav a.active {
  background: var(--color-text);
  color: #fff;
  font-weight: 600;
}

/* 首屏 */
.hero {
  position: relative;
  text-align: left;
  padding: 72px 0 56px;
  overflow: hidden;
}
.hero .container { position: relative; }
.hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 400px);
  gap: 40px;
  align-items: center;
}
.hero-copy p { max-width: 36em; }

/* 配图位：把同名文件放到 images/ 即可替换占位 */
.media-slot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(217, 119, 6, 0.4);
  background:
    linear-gradient(160deg, rgba(217, 119, 6, 0.1) 0%, transparent 55%),
    repeating-linear-gradient(-45deg, transparent, transparent 10px, rgba(28, 25, 23, 0.03) 10px, rgba(28, 25, 23, 0.03) 20px);
}
.media-slot::before {
  content: attr(data-hint);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  pointer-events: none;
  white-space: pre-line;
}
.media-slot img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-slot--portrait { aspect-ratio: 4 / 5; }
.media-slot--landscape { aspect-ratio: 16 / 10; }
.media-slot--wide { aspect-ratio: 21 / 9; }
.media-slot--scene { aspect-ratio: 16 / 9; margin-top: 8px; }

.hero.hero-compact .media-slot--wide { margin-top: 24px; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  margin: 0 0 18px;
}
.hero-eyebrow::before {
  content: '';
  width: 18px;
  height: 2px;
  background: var(--color-primary);
}
.hero-dog {
  width: 120px;
  height: 120px;
  margin-bottom: 8px;
  filter: drop-shadow(0 8px 20px rgba(217, 119, 6, 0.25));
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0 0 12px;
}
.hero .slogan {
  font-size: 18px;
  color: var(--color-primary-dark);
  font-weight: 500;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.hero p {
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 0 28px;
  font-size: 15px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-text);
  color: #fff;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  border: 1px solid var(--color-text);
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: border-color .15s ease, color .15s ease;
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

/* 区块与卡片 */
.section { padding: 48px 0; }
.section-head { margin-bottom: 28px; }
.section-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.section-sub {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 15px;
  max-width: 480px;
}
.section-title + .section-sub { margin-top: 0; }

.grid { display: grid; gap: 14px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 22px 22px 22px 24px;
  position: relative;
  transition: border-color .15s ease, transform .15s ease;
}
.card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 2px;
  background: var(--color-primary);
  opacity: 0.55;
}
.card:hover {
  border-color: rgba(217, 119, 6, 0.45);
  transform: translateY(-2px);
}
.card .icon {
  width: 36px;
  height: 36px;
  fill: var(--color-primary);
  margin-bottom: 12px;
  opacity: 0.9;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.6;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 14px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-primary-dark);
}
.card-stack { display: flex; flex-direction: column; gap: 14px; max-width: 720px; }
.card-stack .card { margin: 0; }

.notice {
  background: var(--color-primary-soft);
  border: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  text-align: left;
  margin-bottom: 28px;
  font-size: 14px;
  color: var(--color-text);
}

/* 训练阶段 */
.stage-flow { display: flex; flex-direction: column; gap: 10px; max-width: 640px; }
.stage-item { display: flex; align-items: flex-start; gap: 14px; }
.stage-num {
  flex: 0 0 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  font-family: var(--font-display);
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.02em;
}
.stage-item .card { flex: 1; }
.stage-item h3 { margin: 0 0 6px; font-size: 15px; }
.stage-item p { margin: 0; color: var(--color-text-muted); font-size: 14px; }
.stage-arrow { text-align: center; fill: var(--color-primary); height: 18px; opacity: 0.7; }

/* FAQ */
details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  transition: border-color .15s ease;
}
details[open] { border-color: rgba(217, 119, 6, 0.4); }
summary {
  cursor: pointer;
  font-weight: 600;
  padding: 16px 18px;
  font-size: 15px;
  list-style: none;
  letter-spacing: -0.01em;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: '+';
  float: right;
  color: var(--color-primary);
  font-weight: 500;
  font-family: var(--font-display);
}
details[open] summary::after { content: '−'; }
details p {
  margin: 0;
  padding: 0 18px 16px;
  color: var(--color-text-muted);
  font-size: 14px;
}

/* 页脚 */
.site-footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.55);
  margin-top: 56px;
  padding: 36px 0;
  text-align: left;
  font-size: 13px;
}
.site-footer a { color: rgba(255, 255, 255, 0.7); }
.site-footer a:hover { color: #fff; }
.footer-nav { margin-bottom: 12px; }
.footer-nav a { margin: 0 10px 0 0; }
.site-footer .beian {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 14px;
  margin-top: 4px;
}
.site-footer .icp,
.site-footer .gongan {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 13px;
}
.site-footer .gongan img {
  width: 16px;
  height: 18px;
  flex-shrink: 0;
}
.site-footer p { margin: 0 0 4px; }

/* 居中型子页首屏（训练/FAQ 等） */
.hero.hero-compact {
  padding: 48px 0 32px;
  text-align: left;
}
.hero.hero-compact h1 { font-size: clamp(26px, 4vw, 34px); }

/* 移动端 */
@media (max-width: 800px) {
  .hero-split { grid-template-columns: 1fr; gap: 28px; }
  .media-slot--portrait { aspect-ratio: 16 / 10; }
}
@media (max-width: 600px) {
  .header-inner { justify-content: flex-start; }
  .site-nav { width: 100%; }
  .hero { padding: 48px 0 40px; }
  .section-title { font-size: 22px; }
}