:root {
  --primary: #0b3d62;
  --primary-dark: #07233a;
  --primary-deeper: #051a2c;
  --primary-light: #12507f;
  --accent: #e85d15;
  --accent-dark: #c94b0c;
  --accent-glow: rgba(232, 93, 21, .35);
  --bg: #ffffff;
  --bg-alt: #f5f7f9;
  --bg-soft: #eaeef2;
  --text: #1a2633;
  --muted: #5a6b7c;
  --border: #d9e0e6;
  --shadow-sm: 0 2px 8px rgba(7, 35, 58, .06);
  --shadow-md: 0 10px 28px rgba(7, 35, 58, .10);
  --shadow-lg: 0 22px 52px rgba(7, 35, 58, .16);
  --radius: 14px;
  --radius-sm: 9px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: "IBM Plex Sans", "Segoe UI", Arial, "Noto Sans SC", sans-serif; color: var(--text); line-height: 1.75; font-size: 20px; background: var(--bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .18s ease; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }

/* ===== Accessibility & interaction polish (taste audit 2026-09-03) ===== */
.skip-link { position: absolute; left: -9999px; top: 0; background: #fff; color: var(--primary); padding: 12px 20px; font-weight: 600; z-index: 300; box-shadow: var(--shadow-md); border-radius: 0 0 9px 0; }
.skip-link:focus { left: 0; }
a:focus-visible, .btn:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.btn:active, .cta-nav:active { transform: translateY(0) scale(.97); }
.hero h1, .section-title, .card h3, .feature h3, .proc-body h3, .page-hero h1, .cta-band h2 { text-wrap: balance; }
.prose th, .prose td, .hero-strip-item strong, .proc-no { font-variant-numeric: tabular-nums; }
.f-icon { color: var(--accent); }
.f-icon svg { width: 46px; height: 46px; display: block; }
.f-ico { width: 1.15em; height: 1.15em; vertical-align: -.18em; margin-right: .35em; }
.contact-item h3 { display: flex; align-items: center; }
.contact-item h3 .f-ico { color: var(--accent); }

/* Reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Header ===== */
.site-header { position: sticky; top: 0; background: #ffffff; border-bottom: 1px solid var(--border); z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 78px; flex-wrap: nowrap; gap: 16px; max-width: 1320px; }
.logo { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 1.35rem; color: var(--primary); letter-spacing: .2px; white-space: nowrap; flex-shrink: 0; }
.logo img { height: 46px; }
.main-nav { display: flex; align-items: center; gap: 18px; flex-wrap: nowrap; }
.main-nav a { color: var(--text); font-size: 1.05rem; font-weight: 500; position: relative; padding: 6px 0; white-space: nowrap; }
.main-nav a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 3px; background: var(--accent); transition: width .25s ease; border-radius: 3px; }
.main-nav a:hover { color: var(--accent); }
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }
.main-nav a.active { color: var(--accent); }
.cta-nav { background: var(--accent); color: #fff !important; padding: 12px 20px; border-radius: 8px; font-weight: 600; font-size: 1.05rem; box-shadow: 0 4px 16px var(--accent-glow); white-space: nowrap; flex-shrink: 0; }
.cta-nav::after { display: none; }
.cta-nav:hover { background: var(--accent-dark); transform: translateY(-2px); }

/* ===== Hero ===== */
.hero { position: relative; min-height: 620px; display: flex; align-items: center; color: #fff; overflow: hidden; background: var(--primary-deeper); }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center 30%; }
.hero-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(3,16,28,.92) 0%, rgba(5,26,44,.78) 45%, rgba(5,26,44,.40) 100%); }
.hero-inner { position: relative; z-index: 2; padding: 90px 24px; max-width: 1200px; margin: 0 auto; width: 100%; }
.hero-badge { display: inline-flex; align-items: center; gap: 9px; background: var(--primary); border: 1px solid rgba(255,255,255,.28); border-radius: 50px; padding: 10px 22px; font-size: 1.05rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; color: #ffd9c2; margin-bottom: 28px; }
.hero-badge::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }
.hero h1 { font-size: 3.8rem; max-width: 880px; line-height: 1.12; font-weight: 700; letter-spacing: -1px; }
.hero h1 em { font-style: normal; color: #ffb37d; }
.hero-sub { margin: 26px 0 40px; font-size: 1.5rem; color: #cfe0ea; max-width: 700px; line-height: 1.6; }
.hero-cta { display: flex; gap: 18px; flex-wrap: wrap; }

/* ===== Buttons ===== */
.btn { display: inline-block; padding: 18px 40px; border-radius: 9px; font-weight: 600; font-size: 1.25rem; transition: all .22s ease; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 22px var(--accent-glow); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-3px); box-shadow: 0 12px 30px var(--accent-glow); }
.btn-ghost { border: 2px solid #fff; color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.14); transform: translateY(-3px); }

/* ===== Hero trust strip ===== */
.hero-strip { background: var(--primary-deeper); border-top: 1px solid rgba(255,255,255,.10); }
.hero-strip-inner { display: flex; flex-wrap: wrap; justify-content: center; gap: 20px; padding: 34px 24px; max-width: 1200px; margin: 0 auto; }
.hero-strip-item { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 4px; color: #c8d9e4; font-size: 1.15rem; font-weight: 500; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.18); border-radius: 12px; padding: 18px 26px; flex: 1 1 220px; max-width: 280px; } /* 数值上/说明下(2026-09-03 用户要求,原左右排) */
.hero-strip-item strong { color: #fff; font-size: 1.6rem; font-weight: 700; white-space: nowrap; }

/* ===== Sections ===== */
.section { padding: 92px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: 2.9rem; text-align: center; color: var(--primary); font-weight: 700; letter-spacing: -.5px; margin-bottom: 14px; }
.section-title::after { content: ""; display: block; width: 76px; height: 4px; background: var(--accent); margin: 18px auto 0; border-radius: 4px; }
.section-sub { text-align: center; color: var(--muted); margin: 18px auto 52px; max-width: 760px; font-size: 1.3rem; }

/* ===== Cards ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: all .25s ease; color: var(--text); box-shadow: var(--shadow-sm); }
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); border-color: transparent; }
.card img { height: 210px; width: 100%; object-fit: cover; transition: transform .5s ease; }
.card:hover img { transform: scale(1.05); }
.card h3 { font-size: 1.45rem; padding: 20px 22px 8px; color: var(--primary); font-weight: 600; }
.card p { padding: 0 22px 22px; color: var(--muted); font-size: 1.15rem; }
.card-more { height: 210px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; background: linear-gradient(160deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; }
.card-more .plus { font-size: 3rem; font-weight: 300; color: var(--accent); line-height: 1; }
.card-more span { font-size: 1.15rem; font-weight: 500; color: #c8d9e4; }

/* ===== Features ===== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 30px; margin-top: 40px; }
/* Why Longrui 4 卡一行(2026-09-03 用户要求;窄屏自动回退 2 列/1 列) */
.feature-grid-4up { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.feature-grid-4up .feature { padding: 26px 22px; }
@media (max-width: 1180px){ .feature-grid-4up { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; } .feature-grid-4up .feature { padding: 30px 26px; } }
@media (max-width: 620px){ .feature-grid-4up { grid-template-columns: 1fr; } }
.feature { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 34px 30px; transition: all .22s ease; box-shadow: var(--shadow-sm); }
.feature:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.feature .f-icon { font-size: 2.2rem; margin-bottom: 16px; display: block; }
.feature h3 { color: var(--primary); font-size: 1.45rem; margin-bottom: 12px; font-weight: 600; }
.feature p { color: var(--muted); font-size: 1.18rem; line-height: 1.7; }

/* ===== Video ===== */
.video-wrap { max-width: 900px; margin: 0 auto; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); border: 1px solid var(--border); }
.video-wrap video { width: 100%; display: block; }

/* ===== CTA band ===== */
.cta-band { background: linear-gradient(120deg, var(--primary-deeper) 0%, var(--primary) 55%, var(--primary-light) 100%); color: #fff; padding: 80px 0; }
.cta-band h2 { font-size: 2.9rem; font-weight: 700; letter-spacing: -.5px; }
.cta-band p { margin: 16px 0 32px; color: #c4d6e1; font-size: 1.35rem; }
.cta-band .btn-primary { background: #fff; color: var(--primary); box-shadow: 0 8px 26px rgba(0,0,0,.25); }
.cta-band .btn-primary:hover { background: #f0f4f7; }

/* ===== Page hero (inner pages) ===== */
.page-hero { background: linear-gradient(120deg, var(--primary-deeper) 0%, var(--primary) 65%, var(--primary-light) 100%); color: #fff; padding: 70px 0; }
.page-hero h1 { font-size: 2.7rem; font-weight: 700; letter-spacing: -.5px; }
.page-hero p { color: #c4d6e1; margin-top: 14px; max-width: 800px; font-size: 1.2rem; }

/* ===== Content blocks ===== */
.prose { max-width: 920px; margin: 0 auto; padding: 64px 24px; }
.prose h2 { color: var(--primary); margin: 44px 0 16px; font-size: 1.9rem; font-weight: 700; letter-spacing: -.3px; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { margin-bottom: 16px; line-height: 1.8; font-size: 1.2rem; }
.prose ul { padding-left: 26px; margin-bottom: 16px; }
.prose table { width: 100%; border-collapse: collapse; margin: 24px 0; border-radius: var(--radius-sm); overflow: hidden; box-shadow: var(--shadow-sm); }
.prose th, .prose td { border: 1px solid var(--border); padding: 14px 18px; text-align: left; font-size: 1.15rem; }
.prose th { background: var(--primary); color: #fff; font-weight: 600; }
.prose tr:nth-child(even) td { background: var(--bg-alt); }
.prose blockquote { border-left: 5px solid var(--accent); background: var(--bg-alt); padding: 18px 24px; margin: 24px 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-style: italic; font-size: 1.1rem; }

/* ===== Cert grid ===== */
.cert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 26px; }
.cert { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; text-align: center; transition: all .22s ease; box-shadow: var(--shadow-sm); }
.cert:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.cert img { max-height: 210px; margin: 0 auto 16px; object-fit: contain; }
.cert h3 { font-size: 1.15rem; color: var(--primary); font-weight: 600; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-item { margin-bottom: 26px; padding: 26px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-sm); }
.contact-item h3 { color: var(--primary); font-size: 1.2rem; margin-bottom: 8px; font-weight: 600; }
.contact-item p { color: var(--muted); font-size: 1.1rem; word-break: break-word; }
.inquiry-form label { display: block; font-weight: 600; margin: 18px 0 8px; font-size: 1.1rem; }
.inquiry-form input, .inquiry-form textarea { width: 100%; padding: 15px 17px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-family: inherit; font-size: 1.1rem; transition: border-color .18s ease, box-shadow .18s ease; background: var(--bg-alt); }
.inquiry-form input:focus, .inquiry-form textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(11,61,98,.10); background: #fff; }

/* ===== Footer ===== */
.site-footer { background: #07182a; color: #8fa7b8; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 2fr; gap: 40px; }
.site-footer h4 { color: #fff; margin-bottom: 18px; font-size: 1.2rem; font-weight: 600; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 10px; }
.site-footer a { color: #8fa7b8; font-size: 1.05rem; }
.site-footer a:hover { color: #fff; }
.site-footer .footer-grid p { line-height: 1.8; font-size: 1.05rem; }
.copyright { border-top: 1px solid rgba(255,255,255,.09); margin-top: 48px; padding: 22px 24px; font-size: .95rem; text-align: center; color: #6e8799; }

/* ===== Gallery ===== */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; margin: 28px 0; }
.gallery-item { margin: 0; }
.gallery-item img { width: 100%; height: 220px; object-fit: cover; border-radius: var(--radius-sm); border: 1px solid var(--border); transition: transform .25s ease, box-shadow .25s ease; }
.gallery-item img:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.gallery-item figcaption { font-size: .92rem; color: var(--muted); text-align: center; margin-top: 8px; }

/* ===== Responsive ===== */
@media (max-width: 1180px) {
  .main-nav { gap: 10px; }
  .main-nav a { font-size: .96rem; }
  .logo { font-size: 1.2rem; }
  .logo img { height: 42px; }
  .cta-nav { padding: 10px 16px; font-size: .96rem; }
}
@media (max-width: 1050px) {
  /* 窄屏:logo 独占一行,导航整行换到下方(不丢项不截断) */
  .header-inner { flex-wrap: wrap; height: auto; row-gap: 4px; padding: 12px 24px; }
  .main-nav { width: 100%; justify-content: flex-end; gap: 16px; overflow-x: auto; }
  .main-nav a { font-size: .95rem; }
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 800px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2.2rem; }
  .hero-sub { font-size: 1.15rem; }
  .hero { min-height: 520px; }
  .hero-inner { padding: 70px 24px; }
  .section { padding: 64px 0; }
  .section-title { font-size: 1.9rem; }
  .main-nav { gap: 14px; font-size: .98rem; }
  .header-inner { height: 70px; flex-wrap: wrap; padding: 8px 24px; }
  .hero-strip-inner { flex-direction: column; gap: 14px; }
  body { font-size: 16px; }
}

/* ===== Manufacturing Process page ===== */
.prose-wide { max-width: 1180px; }
.prose-wide > p { max-width: 920px; }
.proc-intro { font-size: 1.25rem; color: var(--muted); }
.proc-list { margin-top: 20px; }
.proc-step { display: flex; align-items: center; gap: 56px; margin: 64px 0; flex-wrap: wrap; }
.proc-step:nth-child(even) { flex-direction: row-reverse; }
.proc-step.proc-big { flex-direction: column; align-items: stretch; gap: 8px; }
.proc-step.proc-big .proc-body { max-width: 940px; margin: 0 auto; text-align: center; flex-basis: auto; }
.proc-step.proc-big .proc-media { max-width: none; width: 100%; flex-basis: auto; margin-top: 18px; }
.proc-step.proc-big .proc-imgs img { flex: 1 1 46%; min-width: 300px; max-height: 620px; }
.proc-media { flex: 1 1 480px; max-width: 660px; min-width: 300px; }
.proc-media img { width: auto; max-width: 100%; height: auto; max-height: 520px; margin: 0 auto; border-radius: var(--radius-sm); box-shadow: var(--shadow-md); border: 1px solid var(--border); }
.proc-imgs { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.proc-imgs img { flex: 1 1 0; min-width: 0; max-height: 400px; object-fit: contain; }
.proc-body { flex: 1 1 380px; min-width: 300px; }
.proc-no { display: block; font-size: 3.3rem; font-weight: 800; line-height: 1; color: transparent; -webkit-text-stroke: 2px var(--accent); margin-bottom: 12px; letter-spacing: 1px; }
.proc-body h3 { font-size: 1.9rem; color: var(--primary); font-weight: 700; margin: 0 0 12px; letter-spacing: -.3px; }
.proc-body p { font-size: 1.2rem; line-height: 1.8; color: var(--muted); margin: 0; }
.proc-cta { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 40px; text-align: center; margin-top: 20px; }
.proc-cta p { font-size: 1.25rem; color: var(--muted); margin-bottom: 22px; }
@media (max-width: 900px) {
  .proc-step { gap: 28px; margin: 48px 0; }
  .proc-no { font-size: 2.6rem; }
  .proc-media img { max-height: 380px; }
}

/* ===== Motion enhancement (taste audit 2026-09-03, dial up) ===== */
/* Hero entry: 加载时逐段上浮入场(纯 CSS stagger,无需 JS) */
.hero-inner > * { animation: heroIn .9s cubic-bezier(.16,1,.3,1) both; }
.hero-inner > *:nth-child(1) { animation-delay: .1s; }
.hero-inner > *:nth-child(2) { animation-delay: .25s; }
.hero-inner > *:nth-child(3) { animation-delay: .5s; }
.hero-inner > *:nth-child(4) { animation-delay: .68s; }
@keyframes heroIn { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: none; } }
/* 内页 page-hero 标题入场 */
.page-hero > .container > * { animation: heroIn .8s cubic-bezier(.16,1,.3,1) both; }
.page-hero > .container > *:nth-child(2) { animation-delay: .18s; }

/* 卡片网格错落级联(现有 reveal 之上加 stagger delay) */
.card-grid > .reveal:nth-child(2), .feature-grid > .reveal:nth-child(2) { transition-delay: .08s; }
.card-grid > .reveal:nth-child(3), .feature-grid > .reveal:nth-child(3) { transition-delay: .16s; }
.card-grid > .reveal:nth-child(4), .feature-grid > .reveal:nth-child(4) { transition-delay: .24s; }
.card-grid > .reveal:nth-child(5), .feature-grid > .reveal:nth-child(5) { transition-delay: .32s; }
.card-grid > .reveal:nth-child(6), .feature-grid > .reveal:nth-child(6) { transition-delay: .4s; }

/* 滚动驱动动画(Chrome/Edge/Firefox/Safari 26+ 支持,不支持则优雅无动画) */
@supports (animation-timeline: view()) {
  /* hero 背景视差:滚出时背景慢速上移+微放大,比内容慢 = 纵深 */
  .hero-bg { animation: bgParallax linear both; animation-timeline: view(); animation-range: exit -8% exit 60%; }
  /* hero 内容滚出渐隐 */
  .hero { animation: heroExit linear both; animation-timeline: view(); animation-range: exit 0% exit 45%; }
  /* 文章区块逐块亮起(滚到哪亮到哪) */
  .prose > * { animation: riseIn linear both; animation-timeline: view(); animation-range: entry 0% entry 55%; }
}
@keyframes bgParallax { from { transform: scale(1.02); } to { transform: scale(1.09) translateY(110px); } }
@keyframes heroExit { to { opacity: 0; } }
@keyframes riseIn { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

/* 无障碍:用户系统开了「减少动态效果」则全部静止 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-delay: 0s !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}
/* 打印时所有动画元素直接可见 */
@media print {
  .reveal, .hero-inner > *, .page-hero > .container > *, .prose > * { opacity: 1 !important; transform: none !important; animation: none !important; }
}

/* 2026-09-03c: footer 文字标签(C2 采纳)/ 卡片序号(C6 采纳) */
.f-label{font-weight:600;letter-spacing:.02em;margin-right:.35em}
.f-no{display:block;font-size:.8rem;font-weight:600;letter-spacing:.18em;color:var(--accent,#e85d15);margin-bottom:.35rem}