/* =====================================================================
   瑟梵门窗 · 前端样式（多页 + 手机端适配）
   配色：Logo 青绿 #2ab5c8 + 橙黄 #f5a623 + 深空 #0d1218
   ===================================================================== */
:root {
  --cyan: #2ab5c8;
  --cyan-dark: #1f9aa8;
  --orange: #f5a623;
  --orange-dark: #d68a0e;
  --dark: #0d1218;
  --dark-2: #151d26;
  --dark-3: #1e2933;
  --light: #f8fafb;
  --light-2: #eef2f5;
  --ink: #111827;
  --ink-soft: #6b7280;
  --line: rgba(255, 255, 255, 0.12);
  --line-dark: #e5e7eb;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 14px 40px rgba(13, 18, 24, 0.1);
  --shadow-lg: 0 24px 70px rgba(13, 18, 24, 0.16);
  --maxw: 1200px;
  --header-h: 80px;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body { margin: 0; font-family: var(--sans); color: var(--ink); background: var(--light); line-height: 1.8; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.25; margin: 0 0 .5em; font-weight: 700; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
@media (min-width: 1600px) {
  .container { max-width: 1440px; }
}
@media (min-width: 2200px) {
  .container { max-width: 1680px; }
}
.skip-link { position: absolute; left: -999px; top: 0; z-index: 1000; background: var(--cyan); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }

/* ===== Header ===== */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 50; height: var(--header-h); transition: background .35s, backdrop-filter .35s, box-shadow .35s; }
.site-header.is-scrolled { background: rgba(13, 18, 24, 0.92); backdrop-filter: blur(14px); box-shadow: 0 4px 30px rgba(0,0,0,.15); }
.page-article .site-header { background: rgba(13, 18, 24, 0.92); backdrop-filter: blur(14px); box-shadow: 0 4px 30px rgba(0,0,0,.15); }
.page-about .page-hero-sub,
.page-about .ab-text,
.page-about .value-card p { white-space: pre-line; }
.nav { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand-logo { height: 46px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { color: rgba(255,255,255,.82); font-size: .95rem; font-weight: 400; letter-spacing: 1px; position: relative; padding: 4px 0; transition: color .25s; }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px; background: var(--cyan); transition: width .3s; }
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a.active::after, .nav-links a:hover::after { width: 100%; }
.nav-toggle { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 44px; height: 44px; background: transparent; border: 1px solid rgba(255,255,255,.25); border-radius: 10px; cursor: pointer; }
.nav-toggle span { display: block; height: 2px; width: 20px; margin: 0 auto; background: #fff; transition: transform .25s, opacity .25s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 32px; border-radius: 999px; font-weight: 600; font-size: 1rem; cursor: pointer; border: 1px solid transparent; transition: transform .25s, box-shadow .25s, background .25s, border-color .25s; }
.btn-primary { background: var(--cyan); color: #fff; box-shadow: 0 8px 24px rgba(42,181,200,.28); }
.btn-primary:hover { background: var(--cyan-dark); transform: translateY(-2px); box-shadow: 0 12px 32px rgba(42,181,200,.35); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); transform: translateY(-2px); }
.btn-ghost-dark { background: transparent; color: var(--ink); border: 1px solid var(--line-dark); }
.btn-ghost-dark:hover { border-color: var(--cyan); color: var(--cyan-dark); }
.btn-dark { background: #2b3138; color: #fff; border-color: rgba(255,255,255,.18); }
.btn-dark:hover { background: #3a424b; transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0,0,0,.3); }
.center-cta { text-align: center; margin-top: 46px; }
.center-cta-block { text-align: center; max-width: 760px; margin: 0 auto; }

/* ===== Sections ===== */
.section { padding: 88px 0; }
.section--flush { padding-top: 72px; padding-bottom: 72px; }
@media (min-width: 1600px) {
  .section { padding: 104px 0; }
}
.section-alt { background: #fff; }
.section-dark { background: var(--dark); color: #fff; }
.eyebrow { color: var(--cyan-dark); font-weight: 700; letter-spacing: 4px; font-size: .78rem; text-transform: uppercase; margin: 0 0 12px; }
.eyebrow-light { color: var(--cyan); }
.section-title { font-size: clamp(1.7rem, 4vw, 2.8rem); margin-bottom: 20px; }
.section-title-light { color: #fff; }
.lead { color: var(--ink-soft); max-width: 680px; margin: 0 0 46px; font-size: 1.08rem; }
.lead-light { color: rgba(255,255,255,.72); }

/* ===== Hero ===== */
.hero { position: relative; min-height: 100dvh; display: flex; align-items: center; justify-content: center; overflow: hidden; background: var(--dark); }
.hero-media { position: absolute; inset: 0; z-index: 0; background-size: cover; background-position: center; background-repeat: no-repeat; }
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
/* 尊重「减少动态」系统偏好：关闭视频自动播放与网格动画，改用海报/渐变静态背景 */
@media (prefers-reduced-motion: reduce) {
  .hero-bg { display: none !important; }
  .hero-grid { animation: none; }
  .scroll-line { animation: none; }
}
.hero-media::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(135deg, rgba(10,14,18,.55), rgba(17,24,32,.35) 45%, rgba(24,33,43,.5)),
    radial-gradient(1200px 600px at 70% -10%, rgba(42,181,200,.22), transparent 55%),
    radial-gradient(900px 500px at 20% 110%, rgba(245,166,35,.14), transparent 50%);
}
.hero-overlay { position: absolute; inset: 0; z-index: 1; background: rgba(13,18,24,.25); }
.hero-grid { position: absolute; inset: 0; z-index: 0; opacity: .12; background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px); background-size: 80px 80px; transform: perspective(800px) rotateX(60deg) scale(1.6) translateY(-120px); transform-origin: center top; animation: gridMove 20s linear infinite; }
@keyframes gridMove { 0% { background-position: 0 0; } 100% { background-position: 80px 80px; } }
.hero-content { position: relative; z-index: 2; text-align: center; max-width: 900px; padding: 0 24px; }
.hero-eyebrow { color: var(--cyan); letter-spacing: 5px; font-size: .85rem; font-weight: 700; margin: 0 0 18px; text-transform: uppercase; }
.hero-title { color: #fff; font-size: clamp(2.4rem, 7vw, 5rem); font-weight: 900; letter-spacing: 2px; margin-bottom: 22px; }
.hero-title .line { display: block; width: 80px; height: 3px; background: linear-gradient(90deg, var(--cyan), var(--orange)); margin: 24px auto 0; border-radius: 3px; }
.hero-sub { color: rgba(255,255,255,.82); font-size: .9rem; letter-spacing: 1px; margin-bottom: 18px; }
.hero-actions { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.hero-actions-row1 { display: flex; gap: 16px; }
@media (min-width: 721px) {
  .hero-actions .btn { min-width: 12.5em; }
}
@media (max-width: 720px) {
  .hero-actions { width: fit-content; margin: 0 auto; }
  .hero-actions-row2 { width: 100%; }
}
.hero-scroll { position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%); z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 8px; color: rgba(255,255,255,.45); font-size: .7rem; letter-spacing: 3px; }
.scroll-line { width: 1px; height: 48px; background: linear-gradient(to bottom, var(--cyan), transparent); animation: scrollLine 1.8s ease-in-out infinite; }
@keyframes scrollLine { 0%,100% { transform: scaleY(0); transform-origin: top; } 50% { transform: scaleY(1); transform-origin: top; } 51% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ===== Page hero (内页) ===== */
.page-hero { position: relative; z-index: 2; padding: calc(var(--header-h) + 80px) 0 104px; background-color: #0a0e12; color: #fff; text-align: center; overflow: hidden; }
/* 可选实拍底图：压在暗化渐变之下，仅作轻量底纹（由 EJS 在 heroes 字段存在时注入） */
.page-hero-bg { position: absolute; inset: 0; z-index: 0; background-size: cover; background-position: center; background-repeat: no-repeat; }
.page-hero::before { content: ""; position: absolute; inset: 0; z-index: 1; background: radial-gradient(1000px 420px at 50% -20%, rgba(42,181,200,.14), transparent 55%), linear-gradient(to bottom, rgba(10,14,18,.93) 0%, rgba(10,14,18,.66) 45%, rgba(10,14,18,.46) 100%); }
/* 细颗粒纹理：让纯色/渐变 Hero 也有质感，不显空 */
.page-hero::after { content: ""; position: absolute; inset: 0; z-index: 2; pointer-events: none; opacity: .07; mix-blend-mode: soft-light; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); background-size: 180px 180px; }
.page-hero .container { position: relative; z-index: 3; }
.page-hero-title { color: #fff; font-size: clamp(2rem, 5vw, 3.2rem); text-shadow: 0 2px 20px rgba(0,0,0,.45); }
.page-hero-sub { color: rgba(255,255,255,.72); max-width: 640px; margin: 14px auto 0; }

/* ===== Pillars ===== */
.intro-head { max-width: 760px; }
.pillar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 50px; }
.pillar-card { background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 26px; transition: transform .3s, background .3s, border-color .3s; }
.pillar-card:hover { transform: translateY(-6px); background: rgba(255,255,255,.07); border-color: rgba(42,181,200,.45); }
.pillar-icon { display: block; width: 44px; height: 44px; line-height: 44px; text-align: center; border-radius: 50%; background: linear-gradient(135deg, var(--cyan), var(--cyan-dark)); color: #fff; font-weight: 700; margin-bottom: 18px; font-size: 1.1rem; }
.pillar-card h3 { color: #fff; font-size: 1.25rem; margin-bottom: 10px; }
.pillar-card p { color: rgba(255,255,255,.65); margin: 0; font-size: .95rem; }

/* ===== Product series (首页卡片) ===== */
.series-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.series-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--line-dark); transition: transform .35s, box-shadow .35s; }
.series-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.series-visual { position: relative; height: 220px; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); overflow: hidden; }
.series-visual img, .series-visual .img-ph { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.series-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to top, rgba(13,18,24,.7), transparent); z-index: 1; }
.series-label { position: relative; z-index: 2; display: flex; align-items: center; justify-content: center; height: 100%; font-family: var(--serif); font-size: 2.4rem; color: rgba(255,255,255,.9); font-weight: 900; letter-spacing: 4px; transition: color .35s; text-shadow: 0 2px 20px rgba(0,0,0,.4); }
.series-card:hover .series-label { color: var(--cyan); }
.series-body { padding: 26px 24px; }
.series-body h3 { font-size: 1.35rem; margin-bottom: 10px; }
.series-body p { color: var(--ink-soft); font-size: .96rem; margin: 0 0 16px; }
.series-link { color: var(--cyan-dark); font-weight: 600; font-size: .92rem; transition: color .25s; }
.series-link:hover { color: var(--cyan); }

/* ===== 产品页 详情行 ===== */
.series-detail { display: flex; flex-direction: column; gap: 64px; }
.series-row { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.series-row.reverse .series-row-media { order: 2; }
.series-row-media { position: relative; min-height: 360px; border-radius: var(--radius); overflow: hidden; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); box-shadow: var(--shadow); }
.series-row-media img, .series-row-media .img-ph { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.series-row-label { color: var(--cyan-dark); font-weight: 700; letter-spacing: 3px; font-size: .8rem; text-transform: uppercase; }
.series-row-body h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 10px 0 16px; }
.series-row-body p { color: var(--ink-soft); margin: 0; }

/* ===== Technology ===== */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tech-card { background: #fff; border: 1px solid var(--line-dark); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .3s, box-shadow .3s; }
.tech-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.tech-no { display: block; font-family: var(--serif); font-size: 2.8rem; font-weight: 900; color: var(--cyan); opacity: .22; padding: 22px 24px 0; line-height: 1; }
.tech-info { padding: 6px 24px 22px; }
.tech-info h3 { font-size: 1.3rem; margin-bottom: 8px; }
.tech-info p { color: var(--ink-soft); margin: 0; font-size: .95rem; }
.tech-img { position: relative; width: 100%; height: 170px; border-top: 1px solid var(--line-dark); background: var(--light-2); overflow: hidden; }
img.tech-img { object-fit: cover; display: block; }
.img-ph.tech-img { display: flex; align-items: center; justify-content: center; color: var(--ink-soft); font-size: .85rem; }

/* 深色页中的核心技术卡片（如产品页） */
.section-dark .tech-card { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.12); box-shadow: 0 10px 30px rgba(0,0,0,.25); }
.section-dark .tech-info h3 { color: #fff; }
.section-dark .tech-info p { color: rgba(255,255,255,.65); }
.section-dark .tech-img { border-color: rgba(255,255,255,.12); background: rgba(255,255,255,.04); }
.section-dark .img-ph.tech-img { color: rgba(255,255,255,.55); }

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-visual { position: relative; min-height: 460px; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.about-visual img, .about-visual .img-ph { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.about-visual::before { content: ""; position: absolute; width: 200%; height: 200%; z-index: 1; background: repeating-linear-gradient(45deg, rgba(42,181,200,.05) 0 2px, transparent 2px 24px); animation: rotateBg 30s linear infinite; pointer-events: none; }
@keyframes rotateBg { 0% { transform: rotate(0); } 100% { transform: rotate(360deg); } }
.about-content p { color: var(--ink-soft); margin: 0 0 18px; }
.about-values { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.about-values span { display: inline-block; padding: 8px 18px; border: 1px solid var(--cyan); color: var(--cyan-dark); border-radius: 999px; font-size: .9rem; font-weight: 500; }

/* ===== Values ===== */
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.value-card { background: rgba(255,255,255,.03); border: 1px solid var(--line); border-radius: var(--radius); padding: 36px 28px; transition: transform .3s, border-color .3s; }
.value-card:hover { transform: translateY(-6px); border-color: var(--orange); }
.value-card h3 { color: #fff; font-size: 1.4rem; margin-bottom: 12px; }
.value-card h3::before { content: "·"; color: var(--orange); margin-right: 8px; }
.value-card p { color: rgba(255,255,255,.65); margin: 0; font-size: .95rem; }

/* ===== Cases ===== */
/* 案例网格：统一用 aspect-ratio，保证常规图与宽图比例一致、四周间距完全相等 */
.cases-grid { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: auto; gap: 16px; }
.case-item { position: relative; aspect-ratio: 4 / 3; background: var(--light-2); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); content-visibility: auto; contain-intrinsic-size: auto 240px; }
.case-item.wide { grid-column: span 2; aspect-ratio: 8 / 3; }
.case-item img, .case-item .img-ph { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.3,1); backface-visibility: hidden; will-change: transform; }
.case-item:hover img { transform: scale(1.04); }
.case-cap { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: 28px 18px 16px; background: linear-gradient(to top, rgba(13,18,24,.84), rgba(13,18,24,0)); color: #fff; display: flex; flex-direction: column; gap: 2px; }
.case-cap strong { font-family: var(--serif); font-size: 1.02rem; }
.case-cap span { font-size: .8rem; color: rgba(255,255,255,.74); }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.contact-lead { color: var(--ink-soft); font-size: 1.1rem; margin: 0 0 30px; }
.contact-cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.contact-card { background: #fff; border: 1px solid var(--line-dark); border-radius: var(--radius); padding: 26px 24px; display: flex; flex-direction: column; gap: 12px; box-shadow: var(--shadow); transition: transform .3s, box-shadow .3s; }
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.cc-label { color: var(--cyan-dark); font-weight: 700; letter-spacing: 2px; font-size: .8rem; }
.cc-value { color: var(--ink); font-weight: 600; font-size: 1.15rem; font-family: var(--serif); }
.cc-qr { width: 124px; height: 124px; border-radius: 12px; overflow: hidden; border: 1px solid var(--line-dark); background: #fff; }
.cc-qr img { width: 100%; height: 100%; object-fit: cover; }
.cc-qr-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; background: repeating-linear-gradient(45deg, #f3f6f8, #f3f6f8 10px, #eef2f5 10px, #eef2f5 20px); color: var(--ink-soft); text-align: center; }
.cc-qr-empty span { font-size: .85rem; font-weight: 700; color: var(--ink); }
.cc-qr-empty small { font-size: .72rem; color: #9aa3ad; }
.contact-form { background: var(--dark); color: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 30px; box-shadow: var(--shadow); }
.contact-form h3 { color: #fff; font-size: 1.35rem; margin-bottom: 20px; }
.contact-form label { display: block; color: rgba(255,255,255,.65); font-size: .9rem; margin: 16px 0 6px; }
.contact-form .req { color: var(--orange); }
.contact-form input, .contact-form textarea { width: 100%; padding: 13px 15px; border-radius: var(--radius-sm); border: 1px solid rgba(255,255,255,.14); background: rgba(255,255,255,.05); color: #fff; font-family: inherit; font-size: .95rem; resize: vertical; transition: border-color .25s; }
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--cyan); }
.contact-form .btn { width: 100%; margin-top: 20px; }
.form-note { min-height: 1.3em; margin: 12px 0 0; font-size: .9rem; color: var(--cyan); }

/* ===== Footer ===== */
.site-footer { background: #080b0e; color: rgba(255,255,255,.55); padding: 60px 0 28px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; flex-wrap: wrap; padding-bottom: 30px; border-bottom: 1px solid var(--line); }
.footer-logo { height: 44px; width: auto; margin-bottom: 12px; }
.footer-slogan { font-family: var(--serif); color: #fff; font-size: 0.98rem; letter-spacing: 2px; margin: 0; }
.footer-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-nav a { color: rgba(255,255,255,.55); font-size: .92rem; transition: color .25s; }
.footer-nav a:hover { color: var(--cyan); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding-top: 22px; font-size: .82rem; }
.footer-bottom a { color: rgba(255,255,255,.55); }
.footer-bottom a:hover { color: var(--cyan); }
.beian-todo { color: var(--orange); }

/* ===== 图片占位（无图时） ===== */
.img-ph { display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.5); font-size: .85rem; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); }

/* ===== 404 ===== */
.notfound { padding: 160px 0 120px; text-align: center; }

/* ===== Reveal animations ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 1020px) {
  .pillar-grid, .series-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .series-row { grid-template-columns: 1fr; gap: 24px; }
  .series-row.reverse .series-row-media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 720px) {
  :root { --header-h: 70px; }
  .brand-logo { height: 38px; }
  .section { padding: 70px 0; }
  .nav-links { position: fixed; top: var(--header-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: rgba(13,18,24,.97); backdrop-filter: blur(12px); padding: 10px 24px 24px; transform: translateY(-10px); opacity: 0; pointer-events: none; transition: transform .25s, opacity .25s; border-bottom: 1px solid var(--line); }
  .nav-links.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line); color: rgba(255,255,255,.85); }
  .nav-links a::after { display: none; }
  .nav-toggle { display: flex; }
  .hero-title { font-size: 2.8rem; width: 240px; margin-left: auto; margin-right: auto; }
  .hero-title .line { margin-top: 18px; }
  .pillar-grid, .series-grid, .tech-grid, .value-grid, .cases-grid { grid-template-columns: 1fr; }
  .case-item.wide { grid-column: span 1; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 480px) {
  .hero-actions .btn { font-size: .93rem; padding: 13px 26px; }
}

@media (max-width: 380px) {
  .container { padding: 0 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .hero-grid, .scroll-line, .about-visual::before { animation: none; }
}

/* ===== About blocks（块式多变布局） ===== */
.about-block { position: relative; overflow: hidden; }
.ab-title { font-size: clamp(1.8rem, 3.4vw, 2.6rem); line-height: 1.18; margin: 0 0 18px; color: var(--ink); }
.ab-title span { display: block; }
.ab-title-2 { color: var(--cyan-dark); }
.ab-text { color: var(--ink-soft); font-size: 1.05rem; margin: 0 0 22px; }

/* band：大背景图 + 白底内容卡（无整图遮罩） */
.about-block--band { min-height: 62vh; display: flex; align-items: center; padding: 92px 0; }
.ab-band-bg { position: absolute; inset: 0; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); background-size: cover; background-position: center; }
.about-block--band .container { position: relative; z-index: 1; }
.ab-panel { background: #fff; border-radius: var(--radius); padding: 48px 46px; max-width: 560px; box-shadow: var(--shadow-lg); }

/* split：左图右文 / 右图左文 */
.about-block--split, .about-block--split-reverse { padding: 96px 0; }
.ab-split { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.ab-media { position: relative; min-height: 460px; border-radius: var(--radius); overflow: hidden; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); box-shadow: var(--shadow); }
.ab-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
/* split-reverse：图在右、字在左 */
.about-block--split-reverse .ab-media { order: 2; }
.about-block--split-reverse .ab-body { order: 1; }
/* 透明合图（如供应商 logo 合图）：无边框/无背景/无阴影，保持原始透明效果，不被压窄 */
.ab-media--naked { min-height: 0; border-radius: 0; overflow: visible; background: none; box-shadow: none; }
.ab-media--naked img { position: static; width: 100%; height: auto; object-fit: contain; filter: drop-shadow(0 12px 34px rgba(13,18,24,.16)); }

/* center：居中留白 */
.about-block--center { padding: 104px 0; background: var(--light-2); text-align: center; }
.ab-center { max-width: 760px; margin: 0 auto; }
.ab-title--center span { display: block; }
/* center 可选透明底图（如供应商合图） */
.ab-center-media { margin: 0 auto 30px; max-width: 520px; }
.ab-center-media img { width: 100%; height: auto; display: block; filter: drop-shadow(0 12px 34px rgba(13,18,24,.18)); }


/* ===== 产品中心（电商感：悬浮换背景 + 4:3 清单 + 可拖动长图详情） ===== */
.section-cat { position: relative; z-index: 1; padding: calc(var(--header-h) + 64px) 0 72px; overflow: hidden; isolation: isolate; background: #0d1118; }
.cat-bg { position: absolute; top: 0; left: 0; width: 100%; height: calc(100vw * 9 / 16); max-height: 92vh; min-height: 560px; z-index: 0; background-size: cover; background-position: center; background-repeat: no-repeat; transition: background-image .25s ease; }
.cat-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(8,11,14,.82) 0%, rgba(8,11,14,.30) 42%, rgba(8,11,14,.92) 100%); }
.cat-hero { position: relative; z-index: 2; text-align: center; }
.cat-nav { position: relative; z-index: 2; display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; margin-top: 28px; margin-bottom: 50px; }
.cat-tab { position: relative; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.28); border-radius: 999px; padding: 16px 34px; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px; backdrop-filter: blur(6px); transition: transform .25s, border-color .25s, background .25s, box-shadow .25s; }
.cat-tab .cat-tab-label { font-family: var(--serif); font-size: 1.5rem; font-weight: 900; color: #fff; letter-spacing: 2px; line-height: 1.1; text-shadow: 0 2px 10px rgba(0,0,0,.45); }
.cat-tab .cat-tab-name { font-size: .76rem; color: rgba(255,255,255,.82); letter-spacing: 1px; }
.cat-tab:hover { border-color: var(--cyan); transform: translateY(-2px); }
.cat-tab.active { background: rgba(42,181,200,.92); border-color: var(--cyan); box-shadow: 0 10px 26px rgba(42,181,200,.35); }
.cat-tab.active .cat-tab-label, .cat-tab.active .cat-tab-name { color: #fff; }

.prod-wrap { position: relative; z-index: 1; }
.prod-panel { display: none; }
.prod-panel.active { display: block; animation: prodFade .4s ease; }
@keyframes prodFade { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.prod-head { max-width: 760px; margin-bottom: 34px; color: #fff; }
.prod-head .series-row-label { color: var(--cyan); font-weight: 700; letter-spacing: 2px; }
.prod-series-title { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 8px 0 12px; color: #fff; }
.prod-series-desc { color: rgba(255,255,255,.82); margin: 0; text-shadow: 0 1px 8px rgba(0,0,0,.4); }

.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.prod-card { background: #fff; border: 1px solid rgba(255,255,255,.5); border-radius: var(--radius); overflow: hidden; cursor: pointer; text-align: left; padding: 0; box-shadow: var(--shadow); transition: transform .3s, box-shadow .3s, border-color .3s; display: flex; flex-direction: column; }
.prod-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--cyan); }
.prod-thumb { position: relative; display: block; aspect-ratio: 4 / 3; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); overflow: hidden; }
.prod-thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.prod-card:hover .prod-thumb img { transform: scale(1.05); }
.prod-name { display: block; padding: 16px 18px 4px; font-family: var(--serif); font-weight: 700; font-size: 1.02rem; color: var(--ink); }
.prod-more { display: block; padding: 0 18px 18px; color: var(--cyan-dark); font-size: .85rem; font-weight: 600; }

/* 详情长图弹层（可拖动 / 滚动，多图竖排，不锁高度） */
.prod-modal { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 30px; }
.prod-modal[hidden] { display: none; }
.prod-modal-backdrop { position: absolute; inset: 0; background: rgba(8,11,14,.82); backdrop-filter: blur(4px); }
.prod-modal-box { position: relative; z-index: 1; background: #fff; border-radius: var(--radius); overflow: hidden; max-width: 920px; width: 100%; max-height: 92vh; display: flex; flex-direction: column; box-shadow: var(--shadow-lg); }
.pm-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 20px 26px 14px; border-bottom: 1px solid var(--line-dark); }
.pm-series { display: block; color: var(--cyan-dark); font-weight: 700; letter-spacing: 2px; font-size: .78rem; }
.pm-head h3 { font-size: 1.4rem; margin: 4px 0 0; color: var(--ink); }
.prod-modal-close { flex: none; width: 40px; height: 40px; border-radius: 50%; border: none; background: rgba(13,18,24,.06); color: var(--ink); font-size: 1.5rem; line-height: 1; cursor: pointer; transition: background .25s; }
.prod-modal-close:hover { background: rgba(13,18,24,.14); }
.pm-scroll { overflow-y: auto; max-height: calc(92vh - 132px); padding: 18px; cursor: grab; -webkit-overflow-scrolling: touch; display: flex; flex-direction: column; gap: 14px; }
.pm-scroll.dragging { cursor: grabbing; }
.pm-scroll img { width: 100%; height: auto; display: block; border-radius: 8px; user-select: none; -webkit-user-drag: none; }
.pm-hint { text-align: center; font-size: .8rem; color: var(--ink-soft); margin: 0 0 2px; }
.pm-foot { padding: 14px 26px 20px; border-top: 1px solid var(--line-dark); text-align: center; }

/* ===== 新增组件响应式 ===== */
@media (max-width: 1020px) {
  .contact-cards { grid-template-columns: 1fr 1fr; }
  .ab-split { grid-template-columns: 1fr; gap: 28px; }
  .about-block--split.is-reverse .ab-media { order: 0; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .contact-cards { grid-template-columns: 1fr; }
  .about-block--band { min-height: auto; padding: 64px 0; }
  .ab-panel { padding: 32px 26px; }
  .about-block--split { padding: 64px 0; }
  .ab-media { min-height: 300px; }
  .about-block--center { padding: 70px 0; }
  .cat-nav { gap: 10px; margin-bottom: 34px; }
  .cat-tab { padding: 12px 22px; }
  .cat-tab .cat-tab-label { font-size: 1.2rem; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .prod-modal { padding: 14px; }
  .pm-head { padding: 18px 18px 12px; }
  .pm-scroll { padding: 12px; }
}
@media (max-width: 460px) {
  .prod-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .prod-panel.active { animation: none; }
  .prod-card:hover .prod-thumb img { transform: none; }
}

/* ===== 新闻资讯（2×N 图文列表 + 文章详情） ===== */
.news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.news-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line-dark); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .3s, box-shadow .3s, border-color .3s; color: inherit; }
.news-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--cyan); }
.news-thumb { position: relative; display: block; aspect-ratio: 16 / 9; background: linear-gradient(135deg, var(--dark-2), var(--dark-3)); overflow: hidden; }
.news-thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.news-card:hover .news-thumb img { transform: scale(1.04); }
.news-thumb .img-ph { position: absolute; inset: 0; }
.news-body { display: flex; flex-direction: column; gap: 10px; padding: 24px 26px 28px; flex: 1; }
.news-date { color: var(--cyan-dark); font-size: .8rem; font-weight: 600; letter-spacing: 1px; }
.news-title { font-family: var(--serif); font-size: 1.32rem; line-height: 1.4; color: var(--ink); }
.news-summary { color: var(--ink-soft); font-size: .95rem; margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-more { margin-top: auto; padding-top: 6px; color: var(--cyan-dark); font-size: .88rem; font-weight: 600; }

/* 文章详情 */
.article { padding: calc(var(--header-h) + 60px) 0 96px; background: #fff; }
.article-inner { max-width: 820px; }
.article-back { display: inline-block; color: var(--cyan-dark); font-weight: 600; font-size: .9rem; margin-bottom: 22px; }
.article-date { color: var(--cyan-dark); font-size: .85rem; font-weight: 600; letter-spacing: 1px; margin: 0 0 8px; }
.article-title { font-size: clamp(1.8rem, 4vw, 2.8rem); line-height: 1.3; color: var(--ink); margin-bottom: 16px; }
.article-lead { font-size: 1.08rem; color: var(--ink-soft); margin: 0 0 30px; padding-left: 16px; border-left: 3px solid var(--cyan); }
.article-hero { margin: 0 0 30px; border-radius: var(--radius); overflow: hidden; }
.article-hero img { width: 100%; height: auto; display: block; }
.article-content p { font-size: 1.05rem; line-height: 2; color: #2b3440; margin: 0 0 22px; }
.article-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 14px 0 34px; }
.article-gallery img { width: 100%; height: auto; border-radius: var(--radius-sm); display: block; }
.article-source { color: var(--ink-soft); font-size: .9rem; margin: 6px 0 0; }
.article-brand { margin-top: 44px; }
.article-brand-inner { background: linear-gradient(135deg, var(--dark), #15202b); color: #fff; border-radius: var(--radius); padding: 38px 34px; box-shadow: var(--shadow); }
.article-brand-eyebrow { color: var(--cyan); letter-spacing: 3px; font-size: .76rem; font-weight: 700; text-transform: uppercase; margin: 0 0 10px; }
.article-brand-title { color: #fff; font-size: 1.45rem; margin: 0 0 12px; }
.article-brand-desc { color: rgba(255,255,255,.72); margin: 0 0 24px; font-size: 1rem; line-height: 1.9; }
.article-brand-actions { display: flex; gap: 14px; flex-wrap: wrap; }

@media (max-width: 720px) {
  .news-grid { grid-template-columns: 1fr; gap: 20px; }
  .article { padding-top: calc(var(--header-h) + 40px); }
  .article-gallery { grid-template-columns: 1fr; }
}

/* ===== 如何选窗（choose）— 多变版式 ===== */
.choose-lead { max-width: 860px; margin: 0 auto; text-align: center; font-size: clamp(1.05rem, 1.4vw, 1.25rem); color: var(--ink-soft); line-height: 1.9; }
.choose-head { text-align: center; margin-bottom: 36px; }
.choose-head .series-row-label, .choose-sub { color: var(--cyan); }
/* choose 页复用了产品中心的标题/描述类（原设计为深色背景白字），此处改回浅色背景下的暗字 */
.choose-head .prod-series-title, .choose-fig-text .prod-series-title { color: var(--ink); }
.choose-fig-text .prod-series-desc { color: var(--ink-soft); text-shadow: none; }
.choose-sub { text-align: center; color: var(--ink-soft); margin: -18px auto 30px; max-width: 760px; }

/* 三卡 / 五卡 */
.choose-cards { display: grid; gap: 22px; }
.choose-cards--3 { grid-template-columns: repeat(3, 1fr); }
.choose-cards--5 { grid-template-columns: repeat(5, 1fr); }
.ccard { background: #fff; border: 1px solid var(--line-dark); border-radius: var(--radius); padding: 30px 26px; box-shadow: var(--shadow); transition: transform .3s, box-shadow .3s, border-color .3s; }
.ccard:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(42,181,200,.5); }
.ccard-no { font-family: var(--serif); font-size: 2.4rem; font-weight: 900; color: var(--cyan); opacity: .22; display: block; line-height: 1; margin-bottom: 6px; }
.ccard h3 { font-size: 1.2rem; margin-bottom: 10px; color: var(--ink); }
.ccard p { color: var(--ink-soft); margin: 0; font-size: .95rem; line-height: 1.7; }

/* 图文左右交错 */
.choose-twocol { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: center; }
.choose-twocol.is-reverse .choose-fig { order: 2; }
.choose-fig { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: var(--light-2); min-height: 320px; }
.choose-fig-img { width: 100%; height: 100%; min-height: 320px; object-fit: cover; display: block; }
.choose-fig-ph { min-height: 320px; }
.choose-fig-text .series-row-label { color: var(--cyan); }
.choose-list { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.choose-list li { position: relative; padding-left: 18px; color: var(--ink-soft); line-height: 1.7; }
.choose-list li::before { content: ""; position: absolute; left: 0; top: 11px; width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); }
.choose-list--center { max-width: 720px; margin: 0 auto; text-align: left; }

/* 2x2 网格（四种原因） */
.choose-grid4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 40px; }
.g4 { background: var(--light-2); border: 1px solid var(--line-dark); border-radius: var(--radius); padding: 24px 22px; }
.g4-no { font-family: var(--serif); font-size: 1.6rem; font-weight: 900; color: var(--cyan); opacity: .5; margin-right: 8px; }
.g4 h4 { display: inline; font-size: 1.1rem; color: var(--ink); }
.g4 p { color: var(--ink-soft); margin: 10px 0 0; font-size: .92rem; line-height: 1.7; }

/* 三柱（不可能三角） */
.choose-pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 36px; }
.pillar { background: linear-gradient(160deg, #16212b, #0c1116); border: 1px solid rgba(42,181,200,.30); border-radius: var(--radius); padding: 34px 26px; text-align: center; cursor: pointer; transition: border-color .25s, box-shadow .25s, opacity .25s, transform .25s; }
.pillar:hover { transform: translateY(-2px); border-color: rgba(42,181,200,.6); }
.pillar.is-active { border-color: var(--cyan); box-shadow: 0 0 0 1px rgba(42,181,200,.45), 0 14px 34px rgba(0,0,0,.45); }
.pillar.is-dim { opacity: .5; }
.pillar-ic { display: inline-flex; width: 52px; height: 52px; align-items: center; justify-content: center; border-radius: 50%; background: rgba(42,181,200,.16); color: var(--cyan); font-size: 1.4rem; margin-bottom: 14px; }
.pillar h3 { font-size: 1.2rem; margin-bottom: 10px; color: #fff; }
.pillar p { color: rgba(255,255,255,.72); margin: 0; font-size: .95rem; line-height: 1.7; }
.choose-note { text-align: center; color: var(--ink-soft); margin: 28px auto 0; max-width: 640px; }

/* 三角可视化（不可能三角）— 左侧卡片 + 右侧白底三角 */
.tri-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin-top: 34px; }
.choose-pillars--side { display: flex; flex-direction: column; gap: 16px; margin-top: 0; }
.choose-pillars--side .pillar { display: flex; align-items: flex-start; gap: 18px; text-align: left; padding: 34px 24px; }
.choose-pillars--side .pillar-ic { width: 52px; height: 52px; flex: 0 0 52px; margin-bottom: 0; font-size: 1.4rem; }
.choose-pillars--side .pillar h3 { font-size: 1.18rem; margin: 0 0 8px; }
.choose-pillars--side .pillar p { font-size: 1rem; line-height: 1.7; }
.tri-stage { border-radius: var(--radius); padding: 22px; }
.tri-stage--light { background: transparent; border: none; }
.tri-svg { width: 100%; height: auto; display: block; }
.tri-poly { fill: rgba(42,181,200,.06); stroke: var(--cyan); stroke-width: 2; }
.tri-median { stroke: rgba(13,17,24,.12); stroke-width: 1; stroke-dasharray: 4 5; }
.vtx-dot { fill: var(--cyan); opacity: .9; transition: .3s; }
.vtx-lbl { fill: var(--ink); font-size: 15px; font-weight: 700; text-anchor: middle; transition: .3s; }
.tri-center { fill: none; stroke: rgba(13,17,24,.22); stroke-width: 1.5; stroke-dasharray: 3 4; }
.tri-center-lbl { fill: var(--ink-soft); font-size: 12px; text-anchor: middle; }
.pt-dot { fill: var(--cyan); opacity: .45; transition: .3s; }
.pt-halo { fill: var(--cyan); opacity: 0; transition: .3s; }
.pt-lbl { fill: var(--ink); font-size: 12.5px; font-weight: 600; text-anchor: middle; opacity: 0; transition: .3s; }
/* 高亮：品质+服务 */
.tri-svg--light[data-active="qs"] .pt-qs .pt-dot { fill: var(--cyan-dark); opacity: 1; }
.tri-svg--light[data-active="qs"] .pt-qs .pt-halo { opacity: .22; }
.tri-svg--light[data-active="qs"] .pt-qs .pt-lbl { opacity: 1; }
.tri-svg--light[data-active="qs"] .v-q .vtx-dot, .tri-svg--light[data-active="qs"] .v-s .vtx-dot { fill: var(--cyan-dark); }
.tri-svg--light[data-active="qs"] .pt-sa, .tri-svg--light[data-active="qs"] .pt-qa, .tri-svg--light[data-active="qs"] .v-a { opacity: .35; }
/* 高亮：服务+实惠 */
.tri-svg--light[data-active="sa"] .pt-sa .pt-dot { fill: var(--cyan-dark); opacity: 1; }
.tri-svg--light[data-active="sa"] .pt-sa .pt-halo { opacity: .22; }
.tri-svg--light[data-active="sa"] .pt-sa .pt-lbl { opacity: 1; }
.tri-svg--light[data-active="sa"] .v-s .vtx-dot, .tri-svg--light[data-active="sa"] .v-a .vtx-dot { fill: var(--cyan-dark); }
.tri-svg--light[data-active="sa"] .pt-qs, .tri-svg--light[data-active="sa"] .pt-qa, .tri-svg--light[data-active="sa"] .v-q { opacity: .35; }
/* 高亮：品质+实惠 */
.tri-svg--light[data-active="qa"] .pt-qa .pt-dot { fill: var(--cyan-dark); opacity: 1; }
.tri-svg--light[data-active="qa"] .pt-qa .pt-halo { opacity: .22; }
.tri-svg--light[data-active="qa"] .pt-qa .pt-lbl { opacity: 1; }
.tri-svg--light[data-active="qa"] .v-q .vtx-dot, .tri-svg--light[data-active="qa"] .v-a .vtx-dot { fill: var(--cyan-dark); }
.tri-svg--light[data-active="qa"] .pt-qs, .tri-svg--light[data-active="qa"] .pt-sa, .tri-svg--light[data-active="qa"] .v-s { opacity: .35; }

/* 各类提示框 */
.choose-callout { border-radius: var(--radius); padding: 34px 32px; }
.choose-callout.is-warn { background: rgba(255,107,74,.08); border: 1px solid rgba(255,107,74,.35); }
.choose-callout.is-good { background: rgba(42,181,200,.08); border: 1px solid rgba(42,181,200,.35); margin-top: 34px; }
.choose-callout.is-advice { background: none; border: none; box-shadow: none; padding: 0; }
.is-advice .cc-title { text-align: center; }
.advice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 24px; }
.advice-card { background: linear-gradient(160deg, #eaf6f8, #e0f0f3); border: 1px solid rgba(42,181,200,.28); border-radius: var(--radius); padding: 30px 26px; }
.advice-no { display: block; font-size: 1.7rem; font-weight: 900; color: var(--cyan-dark); margin-bottom: 12px; line-height: 1; }
.advice-card p { margin: 0; color: var(--ink); line-height: 1.85; font-size: .97rem; }
.cc-title { font-size: 1.25rem; margin: 0 0 18px; color: var(--ink); }
.is-warn .cc-title { color: #d9623e; }
.cc-warn-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cc-warn-grid > div { display: flex; gap: 10px; }
.cc-warn-no { color: #e0764f; font-weight: 900; font-size: 1.1rem; }
.cc-warn-grid p { margin: 0; color: var(--ink-soft); font-size: .94rem; line-height: 1.7; }
.cc-good-text { margin: 0; color: var(--ink); font-size: 1.02rem; line-height: 1.9; }

/* 对比（经销商 vs 厂家） */
.choose-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; max-width: 880px; margin: 0 auto; }
.cmp { border-radius: var(--radius); padding: 30px 28px; border: 1px solid var(--line-dark); background: #fff; box-shadow: var(--shadow); }
.cmp--b { background: rgba(42,181,200,.06); border-color: rgba(42,181,200,.35); }
.cmp h3 { font-size: 1.2rem; margin: 0 0 12px; color: var(--ink); }
.cmp p { margin: 0; color: var(--ink-soft); line-height: 1.8; }
.cmp .hl { color: var(--cyan-dark); font-weight: 700; }

/* 收尾 */
.choose-outro { color: rgba(255,255,255,.78); max-width: 620px; margin: 14px auto 26px; line-height: 1.8; }

/* 响应式：如何选窗 */
@media (max-width: 980px) {
  .choose-cards--5 { grid-template-columns: repeat(2, 1fr); }
  .choose-pillars { grid-template-columns: 1fr; }
  .cc-warn-grid { grid-template-columns: 1fr; }
  .advice-grid { grid-template-columns: 1fr; }
  .tri-wrap { grid-template-columns: 1fr; gap: 24px; }
  .choose-pillars--side { flex-direction: row; flex-wrap: wrap; }
  .choose-pillars--side .pillar { flex: 1 1 260px; }
}
@media (max-width: 760px) {
  .choose-twocol { grid-template-columns: 1fr; gap: 24px; }
  .choose-twocol.is-reverse .choose-fig { order: 0; }
  .choose-grid4 { grid-template-columns: 1fr; }
  .choose-cards--3 { grid-template-columns: 1fr; }
  .choose-cards--5 { grid-template-columns: 1fr; }
  .choose-compare { grid-template-columns: 1fr; }
}

/* ===== 选窗 11 问（qa 页） ===== */
.qa-hero { position: relative; }
.qa-hero-mark { position: absolute; top: -150px; right: -130px; z-index: 1; font-family: "SimHei","Microsoft YaHei","Heiti SC",sans-serif; font-weight: 900; font-size: 640px; line-height: 1; color: rgba(42,181,200,.12); transform: rotate(45deg); transform-origin: center; pointer-events: none; user-select: none; }

.qa-dir-head { max-width: 760px; margin-bottom: 34px; }
.qa-dir-head .series-row-label { color: var(--cyan); }
.qa-dir-head .prod-series-title { color: var(--ink); }
.qa-dir-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.qa-dir-card { display: flex; align-items: center; gap: 14px; background: #fff; border: 1px solid var(--line-dark); border-radius: var(--radius-sm); padding: 16px 20px; transition: transform .25s, border-color .25s, box-shadow .25s; }
.qa-dir-card:hover { transform: translateY(-3px); border-color: var(--cyan); box-shadow: var(--shadow); }
.qa-dir-no { flex: 0 0 auto; width: 34px; height: 34px; border-radius: 50%; background: var(--cyan); color: #fff; font-weight: 700; font-size: 1rem; display: flex; align-items: center; justify-content: center; }
.qa-dir-t { color: var(--ink); font-size: 1.02rem; font-weight: 500; }

.qa-list .container { max-width: 880px; }
.qa-item { background: #fff; border: 1px solid var(--line-dark); border-radius: var(--radius-sm); margin-bottom: 14px; overflow: hidden; box-shadow: 0 6px 20px rgba(13,18,24,.05); transition: border-color .3s, box-shadow .3s; }
.qa-item.qa-flash { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(42,181,200,.18); }
.qa-q { display: flex; align-items: center; gap: 14px; padding: 20px 22px; cursor: pointer; list-style: none; }
.qa-q::-webkit-details-marker { display: none; }
.qa-q-no { flex: 0 0 auto; width: 32px; height: 32px; border-radius: 50%; background: var(--cyan); color: #fff; font-weight: 700; font-size: .95rem; display: flex; align-items: center; justify-content: center; }
.qa-q-t { flex: 1; font-family: var(--serif); font-size: 1.18rem; font-weight: 700; color: var(--ink); }
.qa-q-ico { flex: 0 0 auto; width: 16px; height: 16px; position: relative; }
.qa-q-ico::before, .qa-q-ico::after { content: ""; position: absolute; background: var(--cyan-dark); border-radius: 2px; transition: transform .3s; }
.qa-q-ico::before { left: 0; right: 0; top: 7px; height: 2px; }
.qa-q-ico::after { top: 0; bottom: 0; left: 7px; width: 2px; }
.qa-item[open] .qa-q-ico::after { transform: scaleY(0); }
.qa-a { padding: 0 22px 24px 68px; color: var(--ink-soft); }
.qa-a-q { color: var(--ink); font-weight: 600; margin: 0 0 12px; font-size: 1.02rem; }
.qa-a-body p { margin: 0 0 12px; line-height: 1.9; }
.qa-a-body ul { margin: 0 0 12px; padding-left: 20px; }
.qa-a-body li { margin: 0 0 8px; line-height: 1.8; }
.qa-a-body b { color: var(--ink); }

@media (max-width: 1020px) { .qa-dir-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) {
  .qa-dir-grid { grid-template-columns: 1fr; }
  .qa-hero-mark { font-size: 320px; top: -90px; right: -90px; transform: rotate(45deg); }
  .qa-a { padding-left: 22px; }
  .qa-q { padding: 16px 18px; }
}