/* ============ 基础与变量 ============ */
:root {
  --navy-900: #081D33;
  --navy-800: #0C2F52;
  --navy-700: #14406B;
  --navy-600: #1B5083;
  --orange-500: #F25C22;
  --orange-400: #FF7A3D;
  --orange-600: #D64A10;
  --bg: #F5F6F8;
  --bg-alt: #EEF1F5;
  --ink: #16233A;
  --ink-soft: #4A5870;
  --line: #E2E6EC;
  --white: #FFFFFF;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(8, 29, 51, .08);
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Oswald", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============ 视图切换 ============ */
.view { display: none; }
.view.active { display: block; }

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 29, 51, .96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 68px;
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }

.brand-mark { display: inline-flex; flex-shrink: 0; }

.brand-mark img {
  display: block;
  width: auto;
  height: 42px;
}

.footer-logo {
  display: block;
  width: auto;
  height: 40px;
  margin-bottom: 12px;
}

.brand-text { line-height: 1.15; min-width: 0; }

.brand-cn {
  display: block;
  color: var(--white);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 1em;
  white-space: nowrap;
}

.brand-en {
  display: block;
  margin-top: 10px;
  color: var(--orange-400);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  white-space: nowrap;
}

.main-nav { display: flex; align-items: center; gap: 8px; }

.main-nav a {
  color: rgba(255, 255, 255, .78);
  padding: 8px 14px;
  font-size: 15px;
  border-radius: 6px;
  transition: color .2s, background .2s;
}

.main-nav a:hover, .main-nav a.active { color: var(--white); background: rgba(255, 255, 255, .1); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.lang-switch {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--white);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}

.lang-switch:hover { border-color: var(--orange-400); background: rgba(255, 122, 61, .12); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle span { display: block; height: 2px; width: 100%; background: var(--white); border-radius: 2px; transition: transform .25s, opacity .25s; }

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ 通用区块 ============ */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }

.section-head { max-width: 720px; margin-bottom: 40px; }

.section-kicker {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange-500);
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 900;
  color: var(--navy-900);
  letter-spacing: .02em;
}

.section-sub { margin-top: 12px; color: var(--ink-soft); line-height: 1.8; }

/* 按钮 */
.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .2s, background .2s, border-color .2s, color .2s;
}

.btn-primary { background: var(--orange-500); color: var(--white); }
.btn-primary:hover { background: var(--orange-600); transform: translateY(-1px); }

.btn-ghost { border-color: rgba(255, 255, 255, .65); color: var(--white); background: transparent; }
.btn-ghost:hover { border-color: var(--orange-400); color: var(--orange-400); }

.btn-block { width: 100%; }

/* 卡片 */
.grid { display: grid; gap: 20px; }

.grid-4 { grid-template-columns: 1fr; }

.grid-2 { grid-template-columns: 1fr; }
.grid-2 .card-span { grid-column: 1 / -1; }

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}

.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(242, 92, 34, .35); }

.card-icon {
  display: inline-flex;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(242, 92, 34, .1);
  color: var(--orange-500);
  margin-bottom: 16px;
}

.card-icon svg { width: 26px; height: 26px; fill: currentColor; }

.card h3 { font-size: 18px; font-weight: 700; color: var(--navy-900); margin-bottom: 8px; }

.card p { font-size: 14.5px; color: var(--ink-soft); }

.card-img { padding: 0; overflow: hidden; display: flex; flex-direction: column; }

.card-media { aspect-ratio: 4 / 3; overflow: hidden; }

.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }

.card-img:hover .card-media img { transform: scale(1.04); }

.card-body { padding: 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }

.card-link { color: var(--orange-500); font-weight: 700; font-size: 14px; margin-top: auto; }
.card-link:hover { color: var(--orange-600); text-decoration: underline; }

.card-wide .card-media { aspect-ratio: 16 / 9; }

.demo-note { font-size: 13px; color: var(--ink-soft); margin-top: 14px; }

/* ============ 首页 Hero ============ */
.hero { position: relative; min-height: 78vh; display: flex; align-items: center; overflow: hidden; }

.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(8, 29, 51, .94) 0%, rgba(8, 29, 51, .78) 45%, rgba(8, 29, 51, .35) 100%);
}

.hero-content { position: relative; z-index: 1; padding: 90px 20px; }

.hero-kicker {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--orange-400);
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(34px, 6.5vw, 60px);
  font-weight: 900;
  line-height: 1.12;
  color: var(--white);
  letter-spacing: .03em;
  display: flex;
  flex-wrap: wrap;
  gap: 0 14px;
}

.hero-title-accent { color: var(--orange-400); }

.hero-sub {
  margin-top: 20px;
  max-width: 560px;
  font-size: clamp(15px, 2.2vw, 17px);
  color: rgba(255, 255, 255, .85);
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

/* ============ 数据速览 ============ */
.stats-section { background: var(--navy-900); }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px 20px;
}

.stat { text-align: center; }

.stat-num {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 46px);
  font-weight: 700;
  color: var(--orange-400);
  line-height: 1.1;
}

.stat-label { margin-top: 6px; font-size: 14px; color: rgba(255, 255, 255, .7); }

.stats-section .demo-note { color: rgba(255, 255, 255, .5); text-align: center; }

/* ============ 深色横幅（质量） ============ */
.band-dark { background: var(--navy-800); }

.band-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.band-media { border-radius: var(--radius); overflow: hidden; }
.band-media img { width: 100%; height: 100%; object-fit: cover; }

.band-content h2 {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 14px;
}

.band-content p { color: rgba(255, 255, 255, .82); margin-bottom: 18px; }

.band-dark .section-kicker { color: var(--orange-400); }

/* ============ CTA ============ */
.section-cta { padding-top: 0; }

.cta-box {
  background: linear-gradient(120deg, var(--orange-500), var(--orange-600));
  border-radius: var(--radius);
  padding: 44px 32px;
  text-align: center;
  color: var(--white);
}

.cta-box h2 { font-size: clamp(22px, 4vw, 30px); font-weight: 900; margin-bottom: 10px; }

.cta-box p { opacity: .92; margin-bottom: 22px; }

.cta-box .btn { background: var(--navy-900); color: var(--white); border-color: var(--navy-900); }
.cta-box .btn:hover { background: var(--navy-800); }

/* ============ 页头（内页） ============ */
.page-head { background: var(--navy-900); padding: 72px 0 56px; }

.page-kicker {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--orange-400);
  margin-bottom: 12px;
}

.page-head h1 { font-size: clamp(30px, 5vw, 46px); font-weight: 900; color: var(--white); letter-spacing: .02em; }

.page-head p:last-child { margin-top: 12px; font-size: 15.5px; color: rgba(255, 255, 255, .75); max-width: 640px; }

/* ============ 产品页 ============ */
.product-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.product-block:first-child { padding-top: 8px; }

.product-media { border-radius: var(--radius); overflow: hidden; }
.product-media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; }

.product-info h2 { font-size: 24px; font-weight: 900; color: var(--navy-900); margin-bottom: 12px; }

.product-info p { color: var(--ink-soft); margin-bottom: 14px; }

.check-list { display: grid; gap: 8px; }

.check-list li {
  position: relative;
  padding-left: 26px;
  font-size: 14.5px;
  color: var(--ink);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: rgba(242, 92, 34, .14);
  border: 2px solid var(--orange-500);
}

/* 规格表 */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }

.spec-table { width: 100%; min-width: 1000px; border-collapse: collapse; table-layout: fixed; }

.spec-table th, .spec-table td { padding: 10px 12px; text-align: left; }

.spec-table th {
  background: var(--navy-800);
  color: var(--white);
  font-size: 13px;
  font-weight: 700;
}

.spec-table td { font-size: 13px; color: var(--ink); border-top: 1px solid var(--line); }

.spec-table tr:nth-child(even) td { background: #F8FAFC; }

.spec-table th:nth-child(1) { width: 5%; }
.spec-table th:nth-child(2) { width: 12%; }
.spec-table th:nth-child(3) { width: 14%; }
.spec-table th:nth-child(4) { width: 14%; }
.spec-table th:nth-child(5) { width: 10%; }
.spec-table th:nth-child(6) { width: 12%; }
.spec-table th:nth-child(7) { width: 15%; }
.spec-table th:nth-child(8) { width: 18%; }

/* 等级对照表（4 列） */
.grade-table { min-width: 760px; }
.grade-table th:nth-child(1) { width: 12%; }
.grade-table th:nth-child(2) { width: 26%; }
.grade-table th:nth-child(3) { width: 32%; }
.grade-table th:nth-child(4) { width: 30%; }

/* ============ 工艺页 ============ */
.route-grid { display: grid; grid-template-columns: 1fr; gap: 18px; margin-top: 8px; }

.route-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow);
}

.route-num {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  color: var(--orange-500);
  line-height: 1;
}

.route-card h3 { font-size: 20px; font-weight: 900; color: var(--navy-900); }

.route-chain {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--white);
  background: linear-gradient(120deg, var(--navy-800), var(--navy-700));
  border-radius: 8px;
  padding: 10px 14px;
  letter-spacing: .02em;
}

.route-level { font-size: 14px; font-weight: 700; color: var(--orange-500); }

.route-grades { font-size: 13.5px; color: var(--ink-soft); }

.route-desc { font-size: 14px; color: var(--ink-soft); line-height: 1.7; }

.proc-grid { display: grid; grid-template-columns: 1fr; gap: 18px; margin-top: 8px; }

.proc-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.proc-card h3 {
  font-size: 17px;
  font-weight: 900;
  color: var(--navy-900);
  padding-left: 12px;
  border-left: 3px solid var(--orange-500);
  margin-bottom: 10px;
}

.proc-card p { font-size: 14px; color: var(--ink-soft); line-height: 1.75; }

.proc-grid .proc-span { grid-column: 1 / -1; }

.mt { margin-top: 14px; }

/* ============ 关于页 ============ */
.about-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}

.about-text h2 { font-size: 24px; font-weight: 900; color: var(--navy-900); margin-bottom: 14px; }

.about-text p { color: var(--ink-soft); margin-bottom: 12px; }

.about-media { border-radius: var(--radius); overflow: hidden; display: grid; grid-template-columns: 1fr; gap: 12px; }
.about-media img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: var(--radius); }
.about-media img:nth-child(3) { grid-column: 1 / -1; }

/* 企业荣誉和知识产权 */
.honors-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.honor-card { background: #fff; border: 1px solid var(--line, #e5e9f0); border-radius: var(--radius); padding: 30px 26px; text-align: center; box-shadow: 0 6px 20px rgba(10, 32, 64, 0.06); }
.honor-icon { display: inline-flex; align-items: center; justify-content: center; width: 64px; height: 64px; border-radius: 50%; background: rgba(241, 122, 13, 0.12); color: var(--orange, #f17a0d); margin-bottom: 18px; }
.honor-icon svg { width: 34px; height: 34px; fill: currentColor; }
.honor-card h3 { font-size: 19px; font-weight: 800; color: var(--navy-900); margin-bottom: 10px; }
.honor-card p { color: var(--ink-soft); font-size: 14.5px; line-height: 1.7; }
@media (min-width: 640px) { .honors-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .honors-grid { grid-template-columns: repeat(3, 1fr); } }

/* 工艺页：金相/磷化配图 */
.proc-figure { margin: 26px auto 0; max-width: 860px; }
.proc-figure img { width: 100%; border-radius: var(--radius); box-shadow: 0 10px 30px rgba(10, 32, 64, 0.12); }
.proc-figure figcaption { margin-top: 12px; text-align: center; color: var(--ink-soft); font-size: 14px; line-height: 1.6; }
.proc-term-en { display: block; margin-top: 6px; font-family: var(--font-display); letter-spacing: .06em; }
.proc-phos { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: center; max-width: 960px; margin: 0 auto; }
.proc-phos .proc-figure { margin: 0; max-width: 460px; width: 100%; }
.proc-phos .proc-figure img { max-height: 560px; object-fit: cover; }
.proc-phos-text p { color: var(--ink-soft); line-height: 1.8; }
@media (min-width: 768px) { .proc-phos { grid-template-columns: 0.9fr 1.1fr; } }

/* 企业文化页 */
.culture-mv-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.culture-mv-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px; text-align: center; }
.culture-mv-icon { display: inline-flex; align-items: center; justify-content: center; width: 64px; height: 64px; border-radius: 50%; background: rgba(241, 122, 13, 0.12); margin-bottom: 16px; }
.culture-mv-icon svg { width: 30px; height: 30px; fill: #f17a0d; }
.culture-mv-card h2 { font-size: 21px; margin-bottom: 10px; }
.culture-mv-card p { color: var(--ink-soft); line-height: 1.75; }
.culture-values-grid { display: grid; grid-template-columns: 1fr; gap: 18px; }
.culture-value-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; }
.culture-value-icon { display: inline-flex; align-items: center; justify-content: center; width: 52px; height: 52px; border-radius: 50%; background: #f17a0d; margin-bottom: 14px; }
.culture-value-icon svg { width: 25px; height: 25px; fill: #fff; }
.culture-value-card h3 { font-size: 18px; margin-bottom: 8px; }
.culture-value-card p { color: var(--ink-soft); font-size: 14.5px; line-height: 1.7; }
.culture-team-band { background: var(--navy-900); border-radius: var(--radius); padding: 40px 32px; text-align: center; }
.culture-team-band h2 { color: #fff; font-size: 23px; margin-bottom: 12px; }
.culture-team-band p { color: rgba(255,255,255,0.78); line-height: 1.8; max-width: 760px; margin: 0 auto; }
.culture-carousel { margin-top: 30px; }
.carousel-viewport { position: relative; background: var(--navy-900); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.carousel-slide { display: none; margin: 0; }
.carousel-slide.active { display: block; }
.carousel-slide img { width: 100%; height: 320px; display: block; object-fit: contain; background: var(--navy-900); }
.carousel-arrow { position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(255,255,255,.88); display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 2; }
.carousel-arrow svg { width: 22px; height: 22px; fill: var(--navy-900); }
.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }
.carousel-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 14px; }
.carousel-dots { display: flex; flex-wrap: wrap; gap: 8px; min-width: 0; }
.carousel-dot { width: 9px; height: 9px; padding: 0; border: 0; border-radius: 50%; background: #c5ccd6; cursor: pointer; }
.carousel-dot.active { background: var(--orange-500); }
.carousel-counter { font-family: var(--font-display); font-size: 14px; color: var(--ink-soft); white-space: nowrap; }
@media (min-width: 640px) { .culture-values-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) { .culture-mv-grid { grid-template-columns: repeat(2, 1fr); } .carousel-slide img { height: 480px; } }
@media (min-width: 1024px) { .culture-values-grid { grid-template-columns: repeat(4, 1fr); } }

/* 公司简介 · 实力数据 */
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.about-stat {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-stat strong {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--orange-500);
  line-height: 1.1;
}

.about-stat span { font-size: 12.5px; color: var(--ink-soft); }

/* 时间轴 */
.timeline { display: grid; gap: 0; margin-top: 8px; }

.timeline-item {
  position: relative;
  padding: 0 0 34px 30px;
  border-left: 2px solid rgba(242, 92, 34, .35);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange-500);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--orange-500);
}

.timeline-time {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--orange-500);
  margin-bottom: 4px;
}

.timeline-item h3 { font-size: 17px; font-weight: 700; color: var(--navy-900); margin-bottom: 4px; }

.timeline-item p { font-size: 14px; color: var(--ink-soft); }

/* ============ 联系页 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.contact-info h2, .contact-form-wrap h2 { font-size: 22px; font-weight: 900; color: var(--navy-900); margin-bottom: 16px; }

.contact-list { display: grid; gap: 18px; margin-top: 8px; }

.contact-list li { display: flex; gap: 14px; align-items: flex-start; }

.contact-list .card-icon { margin-bottom: 0; flex-shrink: 0; width: 42px; height: 42px; }

.contact-label { display: block; font-size: 13px; font-weight: 700; color: var(--navy-700); letter-spacing: .05em; }

.contact-list p { font-size: 15px; color: var(--ink); margin-top: 2px; }

.contact-form-wrap {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
}

.contact-form { display: grid; gap: 16px; }
.form-honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-row { display: grid; grid-template-columns: 1fr; gap: 16px; }

.form-field { display: grid; gap: 6px; }

.form-field label { font-size: 14px; font-weight: 700; color: var(--navy-800); }

.form-field input, .form-field select, .form-field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--font-cn);
  font-size: 15px;
  color: var(--ink);
  background: #FBFCFD;
  transition: border-color .2s, box-shadow .2s;
}

.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--orange-500);
  box-shadow: 0 0 0 3px rgba(242, 92, 34, .15);
  background: var(--white);
}

/* ============ 页脚 ============ */
.site-footer { background: var(--navy-900); color: rgba(255, 255, 255, .75); padding: 48px 0 24px; }

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  align-items: start;
}

.footer-name { font-size: 20px; font-weight: 900; color: var(--white); letter-spacing: .1em; }

.footer-en { font-family: var(--font-display); font-size: 11px; letter-spacing: .2em; color: rgba(255, 255, 255, .5); margin-top: 2px; }

.footer-brand p:last-child { font-size: 14px; margin-top: 10px; color: var(--orange-400); }

.footer-nav { display: grid; gap: 10px; align-content: start; }

.footer-nav a { font-size: 14.5px; color: rgba(255, 255, 255, .75); }
.footer-nav a:hover { color: var(--orange-400); }

.footer-contact { display: grid; gap: 8px; align-content: start; }
.footer-contact p { font-size: 14px; }

.footer-bottom { padding-top: 20px; font-size: 13px; color: rgba(255, 255, 255, .5); }

/* ============ 视频页 ============ */
.video-stage { max-width: 960px; margin: 0 auto; }

.video-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--navy-900);
  box-shadow: var(--shadow);
}

.video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-cover {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  padding: 24px;
  background: linear-gradient(150deg, rgba(8, 29, 51, .55) 0%, rgba(8, 29, 51, .35) 100%);
  cursor: pointer;
  transition: background .3s;
}

.video-cover:hover { background: linear-gradient(150deg, rgba(8, 29, 51, .7) 0%, rgba(8, 29, 51, .5) 100%); }

.video-cover-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: var(--orange-500);
  color: var(--white);
  box-shadow: 0 8px 24px rgba(242, 92, 34, .45);
  transition: transform .25s, background .25s;
}

.video-cover:hover .video-cover-btn { transform: scale(1.06); background: var(--orange-600); }

.video-cover.hidden { display: none; }

.video-cover-btn svg { width: 34px; height: 34px; fill: currentColor; transform: translateX(2px); }

.video-cover-title { font-size: 20px; font-weight: 900; color: var(--white); }

.video-cover-sub { font-size: 14px; color: rgba(255, 255, 255, .85); max-width: 440px; }

.video-desc { max-width: 760px; margin: 36px auto 0; text-align: center; }

.video-desc h2 { font-size: 22px; font-weight: 900; color: var(--navy-900); margin-bottom: 10px; }

.video-desc p { color: var(--ink-soft); font-size: 15px; }

/* ============ Toast ============ */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 20px);
  background: var(--navy-800);
  color: var(--white);
  padding: 14px 24px;
  border-radius: 8px;
  font-size: 14.5px;
  box-shadow: 0 12px 32px rgba(8, 29, 51, .3);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s, transform .3s;
  max-width: 90vw;
  text-align: center;
  z-index: 200;
}

.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============ 断点：≥768px ============ */
@media (min-width: 768px) {
  .container { padding: 0 32px; }
  .section { padding: 88px 0; }

  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .stats-grid { grid-template-columns: repeat(3, 1fr); }

  .band-inner { grid-template-columns: 1.1fr 1fr; }
  .band-media { aspect-ratio: auto; height: 100%; }
  .band-media img { height: 100%; min-height: 340px; }

  .product-block { grid-template-columns: 1fr 1fr; gap: 40px; }
  .product-block-reverse .product-media { order: 2; }

  .about-intro { grid-template-columns: 1.05fr 1fr; gap: 44px; }
  .about-intro .about-media { grid-template-columns: 1fr 1fr; }
  .about-intro-reverse .about-media { order: -1; grid-template-columns: 1fr 1fr; }

  .contact-grid { grid-template-columns: 1fr 1.2fr; gap: 48px; }

  .form-row { grid-template-columns: 1fr 1fr; }

  .footer-grid { grid-template-columns: 1.2fr 1fr 1.2fr; }
}

/* ============ 断点：768–1023px 中屏压缩头部，避免品牌小字与导航重叠 ============ */
@media (min-width: 768px) and (max-width: 1023px) {
  .header-inner { gap: 10px; }
  .brand { gap: 8px; }
  .brand-cn { font-size: 17px; letter-spacing: .4em; }
  .brand-en { font-size: 9.5px; letter-spacing: .14em; }
  .main-nav { gap: 4px; }
  .main-nav a { padding: 8px 8px; font-size: 13px; }
}

/* ============ 断点：≥1024px ============ */
@media (min-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .route-grid { grid-template-columns: repeat(2, 1fr); }
  .proc-grid { grid-template-columns: repeat(2, 1fr); }

  .hero { min-height: 82vh; }

  .main-nav a { padding: 9px 18px; }
}

/* ============ 移动端导航 ============ */
@media (max-width: 767px) {
  .nav-toggle { display: flex; }

  .brand-cn { letter-spacing: .25em; }

  .brand-en {
    white-space: normal;
    line-height: 1.25;
    font-size: 9px;
    letter-spacing: .12em;
    max-width: 190px;
  }

  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--navy-900);
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px 20px 22px;
    border-bottom: 1px solid rgba(255, 255, 255, .1);
    display: none;
  }

  .main-nav.open { display: flex; }

  .main-nav a { padding: 14px 10px; font-size: 16px; border-bottom: 1px solid rgba(255, 255, 255, .06); border-radius: 0; }

  .hero { min-height: 86vh; }
  .hero-content { padding: 70px 20px; }

  .cta-box { padding: 36px 22px; }
}