/* ==========================================================================
   华辰精密制造 - 企业官网全局样式
   清新科技 · 居中极简骨架
   （透明导航覆盖 Hero + 全屏居中 Hero + 纯文字居中简介 +
     大圆角产品卡 + 圆形优势图标 + 分栏 CTA + 4 列页脚）
   ========================================================================== */

:root {
  --color-primary: #2e8b57;       /* 青绿 */
  --color-primary-dark: #1f5c3d;  /* 深绿 */
  --color-primary-light: #4fb47a; /* 亮绿 */
  --color-navy: #14321f;          /* 深墨绿 */
  --color-mint: #a8e9c6;          /* 浅薄荷绿高亮 */

  --color-text: #2b3a34;
  --color-text-light: #66786f;
  --color-border: #dcebe2;
  --color-bg: #ffffff;
  --color-bg-alt: #f3faf5;
  --color-bg-mint: #e8f7ef;       /* 浅绿缩略图底 */

  --font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
                 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;

  --container-max: 1200px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 10px rgba(20, 50, 31, 0.06);
  --shadow-md: 0 10px 30px rgba(20, 50, 31, 0.12);
  --shadow-lg: 0 18px 46px rgba(20, 50, 31, 0.16);
  --transition: 0.28s ease;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { color: var(--color-navy); line-height: 1.3; font-weight: 700; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section--alt { background: var(--color-bg-alt); }

.section-head { text-align: center; margin-bottom: 52px; }
.section-head .eyebrow {
  display: inline-block; font-size: 14px; letter-spacing: 3px;
  color: var(--color-primary-dark); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: 34px; margin-bottom: 16px; }
.section-head p { color: var(--color-text-light); max-width: 640px; margin: 0 auto; font-size: 16px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 13px 32px; border-radius: 50px;
  font-size: 15px; font-weight: 600; line-height: 1; cursor: pointer;
  border: 2px solid transparent; transition: all var(--transition); text-align: center;
}
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn--accent { background: var(--color-primary-dark); color: #fff; }
.btn--accent:hover { background: var(--color-navy); color: #fff; }
.btn--outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.85); }
.btn--ghost:hover { background: #fff; color: var(--color-navy); border-color: #fff; }
.btn--light { background: #fff; color: var(--color-navy); }
.btn--light:hover { background: var(--color-bg-alt); color: var(--color-navy); }

/* ==========================================================================
   透明导航（覆盖在深绿 Hero / 内页 Banner 之上）
   ========================================================================== */
.site-header--transparent {
  position: absolute; top: 0; left: 0; width: 100%; z-index: 100;
  background: transparent;
}
.site-header__inner {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  height: 88px; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; color: #fff; font-weight: 700; font-size: 21px; justify-self: start; }
.brand__logo {
  width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 21px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.18);
}
.brand small { display: block; font-size: 10px; font-weight: 400; color: rgba(255,255,255,0.7); letter-spacing: 1.5px; }

.main-nav { justify-self: center; }
.main-nav ul { display: flex; gap: 38px; }
.main-nav a {
  display: block; color: rgba(255,255,255,0.92); font-size: 16px; font-weight: 500;
  padding: 8px 0; position: relative;
}
.main-nav a::after {
  content: ""; position: absolute; left: 50%; bottom: 0; width: 0; height: 2px;
  border-radius: 2px; background: var(--color-mint); transition: all var(--transition);
  transform: translateX(-50%);
}
.main-nav a:hover, .main-nav a.is-active { color: #fff; }
.main-nav a:hover::after, .main-nav a.is-active::after { width: 100%; }

.header-cta {
  justify-self: end; white-space: nowrap; padding: 10px 26px; border-radius: 50px;
  border: 2px solid rgba(255,255,255,0.85); color: #fff; font-size: 15px; font-weight: 600;
  transition: all var(--transition);
}
.header-cta:hover { background: #fff; color: var(--color-navy); }

.nav-toggle {
  display: none; background: none; border: none; cursor: pointer; width: 42px; height: 42px;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px; justify-self: end;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: #fff; transition: all var(--transition); }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   首页 Hero —— 全屏居中
   ========================================================================== */
.hero--center {
  position: relative; color: #fff; overflow: hidden; text-align: center;
  min-height: 80vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, #14321f 0%, #1f5c3d 48%, #2e8b57 100%);
  padding: 170px 0 80px;
}
.hero--center::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(circle at 18% 24%, rgba(168,233,198,0.16) 0, transparent 42%),
    radial-gradient(circle at 82% 74%, rgba(255,255,255,0.10) 0, transparent 46%),
    radial-gradient(circle at 50% 110%, rgba(79,180,122,0.28) 0, transparent 50%);
}
.hero__inner { position: relative; width: 100%; max-width: 900px; margin: 0 auto; }
.hero__eyebrow {
  display: inline-block; font-size: 14px; letter-spacing: 4px; text-transform: uppercase;
  color: var(--color-mint); margin-bottom: 22px;
}
.hero--center h1 { color: #fff; font-size: 58px; letter-spacing: 2px; margin-bottom: 24px; }
.hero__sub { font-size: 18px; color: rgba(255,255,255,0.88); max-width: 660px; margin: 0 auto 36px; }
.hero__actions { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; }

.hero__phone { margin-top: 38px; }
.hero__phone a {
  color: var(--color-mint); font-size: 44px; font-weight: 800; letter-spacing: 1px;
  display: inline-flex; align-items: center; gap: 10px; line-height: 1; text-shadow: 0 2px 18px rgba(0,0,0,0.25);
}
.hero__phone a:hover { color: #fff; }

.hero__stats {
  margin-top: 46px; padding-top: 34px; border-top: 1px solid rgba(255,255,255,0.22);
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.hero__stats .stat strong { display: block; font-size: 34px; color: #fff; font-weight: 800; }
.hero__stats .stat span { font-size: 14px; color: rgba(255,255,255,0.72); }

/* ==========================================================================
   公司简介 —— 纯文字居中 + 4 核心数字
   ========================================================================== */
.about-center { text-align: center; max-width: 900px; margin: 0 auto; }
.about-center h2 { font-size: 36px; margin-bottom: 22px; }
.about-center .lead { font-size: 18px; color: var(--color-text); max-width: 760px; margin: 0 auto 18px; }
.about-center p { color: var(--color-text-light); max-width: 720px; margin: 0 auto 16px; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; margin-top: 52px; }
.stat-tile { text-align: center; padding: 8px; }
.stat-tile strong { display: block; font-size: 44px; color: var(--color-primary); font-weight: 800; line-height: 1.1; }
.stat-tile span { display: block; margin-top: 8px; font-size: 15px; color: var(--color-text-light); }

/* ==========================================================================
   产品 —— 3 列大圆角卡片（浅绿缩略图在上）
   ========================================================================== */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.product-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm); scroll-margin-top: 120px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.product-card__thumb {
  height: 200px; background: linear-gradient(135deg, #f0fbf5 0%, #d7f0e1 100%);
  display: flex; align-items: center; justify-content: center; font-size: 64px; color: var(--color-primary); position: relative;
}
.product-card__thumb::after {
  content: "产品图"; position: absolute; right: 14px; bottom: 12px; font-size: 11px; color: #5f7a6a;
  background: rgba(255,255,255,0.8); padding: 3px 10px; border-radius: 12px;
}
.product-card__body { padding: 28px 26px 30px; text-align: center; }
.product-card__body h3 { font-size: 20px; margin-bottom: 12px; }
.product-card__body p { font-size: 14px; color: var(--color-text-light); margin-bottom: 20px; }
.product-card__body .btn { padding: 10px 26px; font-size: 14px; }

/* ==========================================================================
   核心优势 —— 4 列 · 圆形浅绿底图标
   ========================================================================== */
.grid { display: grid; gap: 28px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.advantage-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 38px 26px; text-align: center; box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.advantage-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.advantage-card__icon {
  width: 76px; height: 76px; margin: 0 auto 22px; border-radius: 50%;
  background: var(--color-bg-mint); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center; font-size: 34px;
}
.advantage-card h3 { font-size: 20px; margin-bottom: 12px; }
.advantage-card p { color: var(--color-text-light); font-size: 15px; }

/* ==========================================================================
   新闻 —— 卡片矩阵 3 列
   ========================================================================== */
.news-grid--3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.news-matrix {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.news-matrix:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.news-matrix__thumb {
  height: 140px; background: linear-gradient(135deg, #f0fbf5, #d7f0e1);
  display: flex; align-items: center; justify-content: center; font-size: 46px; color: var(--color-primary);
}
.news-matrix__body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.news-matrix__meta { font-size: 12px; color: var(--color-text-light); margin-bottom: 10px; }
.news-matrix__meta .tag { background: var(--color-bg-mint); color: var(--color-primary-dark); border-radius: 20px; padding: 3px 12px; margin-right: 10px; }
.news-matrix h3 { font-size: 16px; line-height: 1.55; margin-bottom: 10px; }
.news-matrix h3 a { color: var(--color-navy); }
.news-matrix h3 a:hover { color: var(--color-primary); }
.news-matrix p { font-size: 13px; color: var(--color-text-light); margin-top: auto; }

/* 首页双列新闻预览 */
.news-grid--2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }

/* ==========================================================================
   内页 Banner（透明导航的深绿底）
   ========================================================================== */
.page-banner {
  position: relative; background: linear-gradient(160deg, #14321f 0%, #1f5c3d 50%, #2e8b57 100%);
  color: #fff; padding: 170px 0 90px; text-align: center; overflow: hidden;
}
.page-banner::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(circle at 22% 26%, rgba(168,233,198,0.16) 0, transparent 42%),
    radial-gradient(circle at 80% 78%, rgba(255,255,255,0.10) 0, transparent 46%);
}
.page-banner .container { position: relative; }
.page-banner h1 { color: #fff; font-size: 40px; margin-bottom: 14px; letter-spacing: 1px; }
.page-banner p { color: rgba(255,255,255,0.84); max-width: 640px; margin: 0 auto; font-size: 16px; }

/* 品牌/电话 显眼展示 */
.banner-contact { margin-top: 30px; display: flex; align-items: center; justify-content: center; gap: 26px; flex-wrap: wrap; }
.banner-contact .brand-name { color: #fff; font-size: 19px; font-weight: 600; letter-spacing: 1px; }
.banner-phone { color: var(--color-mint); font-size: 34px; font-weight: 800; letter-spacing: 1px; display: inline-flex; align-items: center; gap: 8px; line-height: 1; }
.banner-phone:hover { color: #fff; }

/* ==========================================================================
   面包屑
   ========================================================================== */
.breadcrumb { font-size: 14px; color: var(--color-text-light); padding: 20px 0; border-bottom: 1px solid var(--color-border); }
.breadcrumb a { color: var(--color-text-light); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { margin: 0 8px; color: #bcd3c6; }
.breadcrumb .current { color: var(--color-navy); font-weight: 600; }

/* ==========================================================================
   分页
   ========================================================================== */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin-top: 48px; flex-wrap: wrap; }
.pagination a, .pagination span {
  display: inline-flex; align-items: center; justify-content: center; min-width: 42px; height: 42px;
  padding: 0 15px; border-radius: 50px; border: 1px solid var(--color-border); color: var(--color-text);
  background: #fff; font-size: 14px; transition: all var(--transition);
}
.pagination a:hover { border-color: var(--color-primary); color: var(--color-primary); }
.pagination .is-current { background: var(--color-primary); border-color: var(--color-primary); color: #fff; font-weight: 700; }
.pagination .is-disabled { opacity: 0.4; pointer-events: none; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq { max-width: 820px; margin: 0 auto; }
.faq__item { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 14px; background: #fff; overflow: hidden; box-shadow: var(--shadow-sm); }
.faq__question {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 20px 26px; font-size: 16px; font-weight: 600; color: var(--color-navy);
  background: none; border: none; cursor: pointer; text-align: left; font-family: inherit;
}
.faq__question::after { content: "+"; font-size: 26px; line-height: 1; color: var(--color-primary); font-weight: 400; transition: transform var(--transition); flex-shrink: 0; }
.faq__item.is-open .faq__question::after { content: "−"; }
.faq__answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq__answer p { padding: 0 26px 22px; color: var(--color-text-light); font-size: 15px; }
.faq__item.is-open .faq__answer { max-height: 400px; }

/* ==========================================================================
   CTA —— 分栏：左标题+描述 / 右联系信息卡片
   ========================================================================== */
.cta { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); color: #fff; padding: 76px 0; }
.cta__inner { display: grid; grid-template-columns: 1.35fr 1fr; gap: 56px; align-items: center; }
.cta__left h2 { color: #fff; font-size: 34px; margin-bottom: 16px; }
.cta__left p { color: rgba(255,255,255,0.85); font-size: 16px; max-width: 480px; }

.cta-card {
  background: #fff; color: var(--color-text); border-radius: var(--radius-lg);
  padding: 34px 32px; box-shadow: var(--shadow-lg);
}
.cta-card__title { font-size: 13px; letter-spacing: 2px; color: var(--color-text-light); text-transform: uppercase; margin-bottom: 18px; }
.cta-card__phone a { color: var(--color-primary-dark); font-size: 32px; font-weight: 800; line-height: 1.1; display: inline-flex; align-items: center; gap: 8px; }
.cta-card__phone a:hover { color: var(--color-primary); }
.cta-card__list { margin: 20px 0 26px; }
.cta-card__list li { display: flex; align-items: flex-start; gap: 10px; padding: 8px 0; color: var(--color-text-light); font-size: 15px; }
.cta-card__list li a { color: var(--color-text-light); }
.cta-card__list li a:hover { color: var(--color-primary); }

/* ==========================================================================
   页脚 —— 4 列
   ========================================================================== */
.site-footer { background: var(--color-navy); color: rgba(255,255,255,0.75); padding: 68px 0 0; font-size: 14px; }
.site-footer a { color: rgba(255,255,255,0.75); }
.site-footer a:hover { color: var(--color-mint); }
.site-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 44px; padding-bottom: 50px; }
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 22px; }
.site-footer ul li { margin-bottom: 11px; }
.site-footer__about .brand { margin-bottom: 4px; }
.site-footer__about p { margin-top: 18px; max-width: 300px; line-height: 1.8; }
.site-footer__contact li { display: flex; gap: 10px; margin-bottom: 14px; }
.site-footer__contact .phone a { color: var(--color-mint); font-size: 22px; font-weight: 800; }
.site-footer__contact .phone a:hover { color: #fff; }

.friend-links { border-top: 1px solid rgba(255,255,255,0.12); padding: 30px 0; }
.friend-links h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.friend-links ul { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.friend-links li a { font-size: 13px; color: rgba(255,255,255,0.55); }
.friend-links li a:hover { color: var(--color-mint); }

.footer-resources { border-top: 1px solid rgba(255,255,255,0.12); padding: 20px 0; display: flex; align-items: center; gap: 12px 26px; flex-wrap: wrap; font-size: 14px; color: rgba(255,255,255,0.65); }
.footer-resources__label { color: #fff; font-weight: 600; }
.footer-resources a { color: var(--color-mint); font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.footer-resources a:hover { color: #fff; text-decoration: underline; }

.site-footer__bottom { border-top: 1px solid rgba(255,255,255,0.12); padding: 22px 0; font-size: 13px; color: rgba(255,255,255,0.55); }
.site-footer__bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ==========================================================================
   文章（新闻详情）
   ========================================================================== */
.article { max-width: 820px; margin: 0 auto; }
.article__header { text-align: center; margin-bottom: 40px; }
.article__header h1 { font-size: 32px; margin-bottom: 16px; }
.article__meta { color: var(--color-text-light); font-size: 14px; }
.article__meta span { margin: 0 10px; }
.article__body h2 { font-size: 24px; margin: 36px 0 16px; }
.article__body h3 { font-size: 19px; margin: 26px 0 12px; }
.article__body p { margin-bottom: 18px; color: var(--color-text); }
.article__body ul { margin: 0 0 18px 22px; list-style: disc; color: var(--color-text); }
.article__body ul li { margin-bottom: 8px; }
.article__footer { margin-top: 48px; padding: 24px; background: var(--color-bg-alt); border-radius: var(--radius); text-align: center; }
.article-phone { margin-top: 14px; font-size: 20px; font-weight: 700; }
.article-phone a { color: var(--color-primary-dark); }
.article-phone a:hover { color: var(--color-primary); }

/* ==========================================================================
   企业文化（about 页）
   ========================================================================== */
.culture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.culture-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 38px 30px; text-align: center; box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.culture-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.culture-card__icon {
  width: 68px; height: 68px; margin: 0 auto 22px; border-radius: 50%;
  background: var(--color-bg-mint); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center; font-size: 30px;
}
.culture-card h3 { font-size: 20px; margin-bottom: 12px; }
.culture-card p { color: var(--color-text-light); font-size: 15px; }

/* ==========================================================================
   联系方式（about 页）
   ========================================================================== */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.contact-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 30px; text-align: center; box-shadow: var(--shadow-sm);
}
.contact-card__icon {
  width: 56px; height: 56px; margin: 0 auto 18px; border-radius: 50%;
  background: var(--color-bg-mint); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center; font-size: 24px;
}
.contact-card h3 { font-size: 17px; margin-bottom: 10px; }
.contact-card p { color: var(--color-text-light); font-size: 14px; line-height: 1.7; }
.contact-card a { color: var(--color-primary-dark); font-weight: 600; }
.contact-card a:hover { color: var(--color-primary); }

/* ==========================================================================
   返回顶部
   ========================================================================== */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; width: 48px; height: 48px; border-radius: 50%;
  background: var(--color-primary-dark); color: #fff; border: none; cursor: pointer; font-size: 20px;
  box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transition: all var(--transition); z-index: 90;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--color-primary); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 992px) {
  .header-cta { display: none; }
  .site-header__inner { grid-template-columns: 1fr auto; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .news-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .news-grid--2 { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .hero--center h1 { font-size: 44px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .culture-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .cta__inner { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 27px; }
  .site-header__inner { height: 72px; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute; top: 72px; left: 0; right: 0; background: var(--color-navy);
    box-shadow: var(--shadow-md); max-height: 0; overflow: hidden; transition: max-height var(--transition);
    border-radius: 0 0 16px 16px;
  }
  .main-nav.is-open { max-height: 420px; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 12px 24px; }
  .main-nav a { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.12); }
  .main-nav a::after { display: none; }
  .hero--center { min-height: 88vh; padding: 120px 0 60px; }
  .hero--center h1 { font-size: 34px; }
  .hero__sub { font-size: 16px; }
  .hero__phone a { font-size: 30px; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .about-center h2 { font-size: 27px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .news-grid--2, .news-grid--3 { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .site-footer__bottom .container { justify-content: center; text-align: center; }
  .article__header h1 { font-size: 26px; }
  .product-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .culture-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .page-banner { padding: 130px 0 60px; }
  .page-banner h1 { font-size: 30px; }
  .banner-phone { font-size: 26px; }
}