/* ============================================================
   云泉约牧场 — 企业官网样式
   白底深字，清洁自然风格
   ============================================================ */

:root {
  --color-primary:   #2d5a27;   /* 山野深绿 */
  --color-accent:    #6a9e5f;   /* 草地绿 */
  --color-text:      #1a1a1a;
  --color-muted:     #555555;
  --color-bg:        #ffffff;
  --color-bg-light:  #f7f9f5;
  --color-border:    #e2e8df;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --transition: 0.25s ease;
  --max-w: 1160px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

/* ── 容器 ─────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── 顶部导航 ──────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.site-nav ul {
  display: flex;
  gap: 36px;
  list-style: none;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
}

/* 汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ── 通用区块 ──────────────────────────────────────────────── */
.section {
  padding: 80px 0;
}

.section-light {
  background: var(--color-bg-light);
}

.section-title {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 680px;
  margin-bottom: 40px;
  line-height: 1.9;
}

/* ── 英雄区 ────────────────────────────────────────────────── */
.hero {
  min-height: 520px;
  display: flex;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(45,90,39,0.72) 0%, rgba(106,158,95,0.55) 100%),
    url("assets/images/hero-bg.jpg") center / cover no-repeat;
  color: #fff;
}

.hero-content {
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  margin-bottom: 36px;
  opacity: 0.92;
  letter-spacing: 0.08em;
}

.btn-primary {
  display: inline-block;
  padding: 14px 40px;
  background: var(--color-bg);
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ── 图片网格 ──────────────────────────────────────────────── */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.image-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.image-grid img:hover {
  transform: scale(1.03);
}

/* 图片加载失败替代区 */
.image-grid img[data-error] {
  background: var(--color-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── 配送卡片 ──────────────────────────────────────────────── */
.delivery-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.card p {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ── 订奶联系 ──────────────────────────────────────────────── */
.order-block {
  text-align: center;
}

.contact-info {
  margin-top: 24px;
}

.phone-link {
  display: inline-block;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.06em;
  border-bottom: 3px solid var(--color-accent);
  padding-bottom: 4px;
  transition: color var(--transition);
}

.phone-link:hover {
  color: var(--color-accent);
}

.contact-note {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ── 页脚 ──────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.85);
  padding: 40px 0;
  text-align: center;
}

.footer-brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: 8px;
}

.footer-address {
  font-size: 0.9rem;
  margin-bottom: 8px;
  opacity: 0.75;
}

.footer-copy {
  font-size: 0.85rem;
  opacity: 0.7;
}

.footer-copy a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-copy a:hover {
  color: #fff;
  text-decoration: underline;
}

/* ── 响应式 @media ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: 56px 0; }

  .section-title { font-size: 1.5rem; }

  .hero { min-height: 380px; }

  /* 导航折叠 */
  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    display: none;
    padding: 16px 24px;
  }

  .site-nav.open { display: block; }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav ul li a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
  }

  .site-nav ul li:last-child a { border-bottom: none; }

  /* 图片单列 */
  .image-grid {
    grid-template-columns: 1fr;
  }

  /* 卡片单列 */
  .delivery-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-inner { height: 56px; }
  .site-nav { top: 56px; }

  .btn-primary { padding: 12px 28px; font-size: 0.95rem; }
}