/* Shared layout */
:root {
  --ink: #17212b;
  --muted: #5c6873;
  --paper: #ffffff;
  --soft: #f3f6f7;
  --line: #d9e1e4;
  --primary: #087f72;
  --primary-dark: #075f58;
  --secondary: #c86355;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }
.section-inner, .header-inner, .hero-inner, .footer-inner { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
.site-header { position: relative; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.97); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 800; }
.brand img { border-radius: 8px; }
.main-nav { display: flex; align-items: center; gap: 30px; color: #3f4d57; font-size: 15px; }
.main-nav a { position: relative; }
.main-nav a:not(.nav-download)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 2px; background: var(--primary); transition: right .2s ease; }
.main-nav a:hover::after, .main-nav a.active::after { right: 0; }
.nav-download, .button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; border-radius: 6px; padding: 0 22px; font-weight: 700; }
.nav-download, .button.primary { color: #fff; background: var(--primary); }
.nav-download:hover, .button.primary:hover { background: var(--primary-dark); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 0; background: transparent; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--ink); }
.hero { overflow: hidden; background: var(--soft); border-bottom: 1px solid var(--line); }
.hero-inner { min-height: 650px; display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(380px, .98fr); align-items: center; gap: 72px; padding-block: 52px; }
.eyebrow, .section-kicker, .section-heading > span, .download-band span, .page-hero .eyebrow { display: block; color: var(--primary); font-size: 12px; line-height: 1.3; font-weight: 800; letter-spacing: 0; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 610px; margin: 18px 0 20px; font-size: clamp(42px, 5vw, 68px); line-height: 1.08; letter-spacing: 0; }
.hero-copy > p { max-width: 620px; margin-bottom: 28px; color: #46545f; font-size: 18px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; }
.text-link { color: var(--primary-dark); font-weight: 700; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.hero-facts span { border: 1px solid #cbd6d8; border-radius: 999px; padding: 4px 12px; background: #fff; color: #435159; font-size: 13px; }
.hero-media { position: relative; height: 530px; display: flex; align-items: center; justify-content: center; padding: 24px 62px 24px 30px; }
.hero-media > img { width: auto; max-width: 350px; max-height: 480px; border: 8px solid #fff; border-radius: 18px; box-shadow: 0 18px 50px rgba(28, 49, 56, .16); }
.media-index { position: absolute; left: 0; top: 28px; display: grid; gap: 3px; color: var(--muted); }
.media-index span { font-size: 11px; font-weight: 800; writing-mode: vertical-rl; }
.media-index strong { color: var(--primary); font-size: 30px; }
.media-note { position: absolute; right: 0; bottom: 42px; width: 210px; padding: 16px 18px; border-left: 3px solid var(--secondary); background: #fff; box-shadow: 0 10px 30px rgba(27,47,54,.11); color: #3d4a53; font-size: 13px; }
.task-ledger { border-bottom: 1px solid var(--line); background: #fff; }
.task-ledger .section-inner { min-height: 72px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: center; }
.task-ledger span { padding: 8px 22px; border-right: 1px solid var(--line); text-align: center; font-weight: 700; }
.task-ledger span:first-child { border-left: 1px solid var(--line); }
.content-section { padding: 92px 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 38px; border-bottom: 1px solid var(--line); padding-bottom: 20px; }
.section-heading h2 { margin: 0; font-size: 36px; line-height: 1.2; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-card { min-height: 250px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.feature-card > span { color: var(--secondary); font-size: 13px; font-weight: 800; }
.feature-card h3 { margin: 42px 0 10px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 15px; }
.gallery-section { background: #edf2f2; }
.gallery-grid { min-height: 620px; display: grid; grid-template-columns: 1.2fr .8fr .8fr; align-items: center; gap: 32px; }
.shot-card { margin: 0; }
.shot-card img { width: auto; max-width: 100%; max-height: 520px; margin-inline: auto; border: 7px solid #fff; border-radius: 14px; box-shadow: 0 15px 40px rgba(24,44,51,.13); }
.shot-card figcaption { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; border-top: 1px solid #cbd6d8; padding-top: 12px; color: #52616a; font-size: 13px; }
.shot-card figcaption span { color: var(--primary); font-weight: 800; }
.deep-section { background: #fff; }
.deep-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; align-items: start; }
.deep-grid h2 { margin: 12px 0 18px; font-size: 36px; }
.deep-copy { color: var(--muted); }
.deep-grid ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.deep-grid li { display: grid; grid-template-columns: 100px 1fr; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.deep-grid li strong { color: var(--primary); }
.deep-grid li span { color: #4e5c65; }
.links-section { padding-top: 0; }
.link-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.link-grid a { min-height: 180px; display: grid; align-content: space-between; padding: 28px; border: 1px solid var(--line); border-radius: 8px; background: var(--soft); }
.link-grid span { color: var(--muted); font-size: 13px; }
.link-grid strong { font-size: 22px; }
.link-grid em { color: var(--primary); font-style: normal; font-weight: 700; }
.faq-preview { background: #fafbfb; }
.preview-list { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.preview-list article { border-left: 3px solid var(--primary); padding: 4px 22px; }
.preview-list h3 { margin-bottom: 8px; }
.preview-list p { margin: 0; color: var(--muted); font-size: 14px; }
.download-band { background: var(--primary-dark); color: #fff; }
.download-band .section-inner { min-height: 180px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.download-band span { color: #bfe5df; }
.download-band h2 { margin: 8px 0 0; font-size: 32px; }
.button.light { background: #fff; color: var(--primary-dark); }
.site-footer { padding: 48px 0; background: #111b21; color: #d9e1e4; text-align: center; }
.footer-inner { display: grid; justify-items: center; gap: 18px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; }
.footer-brand img { border-radius: 7px; }
.site-footer nav { display: flex; gap: 24px; font-size: 14px; }
.site-footer p { max-width: 800px; margin: 0; color: #bdc7cc; font-size: 13px; text-align: center; }
.site-footer small { color: #8f9da4; text-align: center; }
/* Internal pages */
.page-hero { padding: 88px 0 70px; border-bottom: 1px solid var(--line); background: var(--soft); }
.page-hero h1 { max-width: 780px; margin: 18px 0; font-size: clamp(38px, 5vw, 60px); line-height: 1.12; }
.page-hero p { max-width: 760px; margin: 0; color: var(--muted); font-size: 18px; }
.guide-layout, .faq-layout { display: grid; grid-template-columns: 290px 1fr; gap: 70px; padding-block: 80px; }
.guide-layout aside, .faq-layout aside { align-self: start; position: sticky; top: 28px; border-top: 3px solid var(--primary); padding-top: 20px; }
.guide-layout aside p, .faq-layout aside p { color: var(--muted); }
.guide-steps { border-top: 1px solid var(--line); }
.guide-steps section { display: grid; grid-template-columns: 68px 1fr; gap: 22px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.guide-steps section > span { color: var(--secondary); font-weight: 800; }
.guide-steps h2 { margin-bottom: 10px; font-size: 25px; }
.guide-steps p { margin: 0; color: #4c5a63; }
.safety-panel { padding: 64px 0; background: #e8f2f0; }
.safety-panel .section-inner { display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; }
.safety-panel ul { margin: 0; padding-left: 22px; }
.safety-panel li { margin-bottom: 12px; }
.next-panel { padding-block: 76px; }
.next-panel p { max-width: 800px; color: var(--muted); }
.faq-layout aside h2 { margin: 12px 0; font-size: 30px; }
.faq-layout aside > span { color: var(--secondary); font-size: 12px; font-weight: 800; }
.faq-layout aside a { color: var(--primary); font-weight: 700; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; font-size: 18px; font-weight: 700; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--primary); font-size: 24px; transition: transform .2s ease; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details > div { padding: 0 46px 24px 0; color: var(--muted); }
/* Variant systems */
.variant-shelf { --primary:#355d8c; --primary-dark:#27486f; --secondary:#9d6a3a; --soft:#f3f5f8; }
.variant-shelf .hero-inner { grid-template-columns: .9fr 1.1fr; }
.variant-shelf .hero-media { justify-content: end; }
.variant-shelf .hero-media > img { transform: rotate(2deg); }
.variant-shelf .feature-grid { grid-template-columns: 1fr 1fr; gap: 18px; border: 0; }
.variant-shelf .feature-card { min-height: 190px; border: 1px solid var(--line); border-radius: 8px; }
.variant-shelf .feature-card h3 { margin-top: 22px; }
.variant-shelf .gallery-grid { grid-template-columns: repeat(3,1fr); }
.variant-timeline { --primary:#496b43; --primary-dark:#355131; --secondary:#a45b52; --soft:#f5f6f2; }
.variant-timeline .task-ledger .section-inner { counter-reset: steps; }
.variant-timeline .task-ledger span { text-align: left; }
.variant-timeline .feature-grid { display: block; border: 0; }
.variant-timeline .feature-card { min-height: 0; display: grid; grid-template-columns: 70px 230px 1fr; align-items: center; border: 0; border-top: 1px solid var(--line); padding: 24px 0; }
.variant-timeline .feature-card h3, .variant-timeline .feature-card p { margin: 0; }
.variant-workspace { --primary:#345f73; --primary-dark:#254957; --secondary:#9b5c49; --soft:#f1f5f6; }
.variant-workspace .hero-media { border-left: 1px solid var(--line); }
.variant-workspace .feature-grid { grid-template-columns: repeat(2,1fr); }
.variant-workspace .feature-card { display: grid; grid-template-columns: 50px 1fr; column-gap: 18px; min-height: 190px; }
.variant-workspace .feature-card h3 { margin: 0; }
.variant-workspace .feature-card p { grid-column: 2; }
.variant-workspace .gallery-grid { grid-template-columns: .8fr 1.2fr .8fr; }
@media (max-width: 900px) {
  .main-nav { position: absolute; left: 24px; right: 24px; top: 68px; display: none; padding: 20px; border: 1px solid var(--line); background: #fff; box-shadow: 0 14px 30px rgba(22,34,42,.12); }
  .main-nav.open { display: grid; gap: 18px; }
  .menu-toggle { display: block; }
  .hero-inner, .variant-shelf .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 22px; padding-block: 46px; }
  .hero-media { height: 440px; order: 2; padding: 20px 42px; }
  .hero-media > img { max-height: 390px; }
  .media-note { width: 190px; bottom: 18px; }
  .feature-grid, .variant-shelf .feature-grid, .variant-workspace .feature-grid { grid-template-columns: repeat(2,1fr); }
  .gallery-grid, .variant-shelf .gallery-grid, .variant-workspace .gallery-grid { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; min-height: 0; }
  .deep-grid { grid-template-columns: 1fr; gap: 34px; }
  .guide-layout, .faq-layout { grid-template-columns: 1fr; gap: 34px; }
  .guide-layout aside, .faq-layout aside { position: static; }
}
@media (max-width: 640px) {
  .section-inner, .header-inner, .hero-inner, .footer-inner { width: min(100% - 32px, var(--container)); }
  .header-inner { min-height: 68px; }
  .hero-inner { padding-block: 34px 26px; }
  .hero h1 { margin-block: 14px 16px; font-size: 39px; line-height: 1.12; }
  .hero-copy > p { margin-bottom: 20px; font-size: 16px; }
  .hero-facts { margin-top: 20px; }
  .hero-media { height: 280px; padding: 10px 30px; }
  .hero-media > img { max-height: 250px; border-width: 5px; }
  .media-index { top: 10px; }
  .media-note { display: none; }
  .task-ledger .section-inner { grid-template-columns: repeat(2,1fr); }
  .task-ledger span { min-height: 48px; display: grid; place-items: center; border-bottom: 1px solid var(--line); font-size: 13px; }
  .content-section { padding: 62px 0; }
  .section-heading { align-items: start; flex-direction: column; margin-bottom: 28px; }
  .section-heading h2, .deep-grid h2 { font-size: 30px; }
  .feature-grid, .variant-shelf .feature-grid, .variant-workspace .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 190px; }
  .variant-timeline .feature-card { grid-template-columns: 50px 1fr; }
  .variant-timeline .feature-card p { grid-column: 2; margin-top: 8px; }
  .gallery-grid, .variant-shelf .gallery-grid, .variant-workspace .gallery-grid { grid-template-columns: repeat(3, minmax(0,1fr)); align-items: end; gap: 8px; }
  .shot-card img { max-height: 290px; border-width: 3px; border-radius: 6px; }
  .shot-card figcaption { display: block; font-size: 11px; }
  .shot-card figcaption span { display: block; }
  .link-grid, .preview-list { grid-template-columns: 1fr; }
  .download-band .section-inner { min-height: 210px; align-items: start; justify-content: center; flex-direction: column; }
  .download-band h2 { font-size: 28px; }
  .page-hero { padding: 62px 0 52px; }
  .page-hero h1 { font-size: 38px; }
  .guide-layout, .faq-layout { padding-block: 56px; }
  .guide-steps section { grid-template-columns: 42px 1fr; }
  .safety-panel .section-inner { grid-template-columns: 1fr; gap: 24px; }
  .faq-list summary { min-height: 78px; font-size: 16px; }
}