/* ==========================================================================
   Changzhou Anchu Welding Equipment Co., Ltd. — site stylesheet
   Single-page company website. No build step, no external dependencies.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --ink: #0a111d;
  --ink-soft: #101b2b;
  --ink-lift: #16243a;
  --paper: #ffffff;
  --cloud: #f5f7fa;
  --cloud-deep: #eaeef4;
  --line: #e2e7ef;
  --line-strong: #cfd7e3;
  --text: #16202f;
  --muted: #5a6a7f;
  --copper: #ba6835;
  --copper-bright: #d9924f;
  --copper-soft: #f8efe7;
  --copper-ink: #8c4a1f;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-xs: 0 1px 2px rgba(12, 20, 32, .06);
  --shadow-sm: 0 1px 2px rgba(12, 20, 32, .05), 0 10px 26px -18px rgba(12, 20, 32, .35);
  --shadow-md: 0 28px 60px -34px rgba(10, 17, 29, .45);
  --shell: 1200px;
  --font-sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Consolas", "Menlo", monospace;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img { height: auto; }

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: -.02em;
  font-weight: 650;
  color: var(--ink);
}

h1 { font-size: clamp(2.1rem, 4.4vw, 3.5rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.7rem, 3vw, 2.5rem); }
h3 { font-size: 1.075rem; letter-spacing: -.01em; }
h4 { font-size: .98rem; }

p { margin: 0; }

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

ul, ol, dl, dd, dt, figure, figcaption, blockquote { margin: 0; padding: 0; }
ul, ol { list-style: none; }

button,
input,
textarea,
select { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--copper-bright);
  outline-offset: 3px;
  border-radius: 4px;
}

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.cn { font-family: var(--font-sans); color: var(--muted); display: block; font-size: .92em; letter-spacing: .01em; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px; left: 16px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--ink);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- Layout helpers ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

.section { padding-block: clamp(64px, 8vw, 118px); }
.section-alt { background: var(--cloud); border-block: 1px solid var(--line); }

.section-dark {
  background: var(--ink);
  color: #cfd8e4;
  background-image:
    radial-gradient(900px 420px at 12% -10%, rgba(217, 146, 79, .16), transparent 70%),
    linear-gradient(180deg, #0a111d 0%, #0d1726 60%, #0a111d 100%);
}
.section-dark h2,
.section-dark h3,
.section-dark h4 { color: #fff; }
.section-dark .section-lede { color: #a9b6c7; }

.section-head {
  max-width: 60ch;
  margin-bottom: clamp(36px, 4.5vw, 60px);
}
.section-head h2 { margin-bottom: 16px; }
.section-lede {
  color: var(--muted);
  font-size: 1.045rem;
  max-width: 62ch;
}
.section-head-row {
  max-width: none;
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  align-items: flex-end;
  justify-content: space-between;
}
.section-head-row > div:first-child { max-width: 62ch; }

.eyebrow {
  margin-bottom: 14px;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--copper);
}
.eyebrow-light { color: var(--copper-bright); }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: .95rem;
  font-weight: 620;
  letter-spacing: .005em;
  cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
    background-color .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--copper-bright), var(--copper));
  color: #1b0f06;
  box-shadow: 0 12px 28px -16px rgba(186, 104, 53, .75);
}
.btn-primary:hover { box-shadow: 0 16px 34px -14px rgba(186, 104, 53, .8); }

.btn-ghost {
  background: rgba(255, 255, 255, .04);
  border-color: rgba(255, 255, 255, .28);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255, 255, 255, .1); border-color: rgba(255, 255, 255, .5); }

.btn-sm { padding: 10px 20px; font-size: .87rem; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 620;
  font-size: .93rem;
  color: var(--copper-ink);
}
.link-arrow::after { content: "→"; transition: transform .18s var(--ease); }
.link-arrow:hover::after { transform: translateX(4px); }
.section-dark .link-arrow { color: var(--copper-bright); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 17, 29, .82);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid rgba(255, 255, 255, .09);
  transition: background-color .25s var(--ease), box-shadow .25s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(10, 17, 29, .96);
  box-shadow: 0 18px 40px -30px rgba(0, 0, 0, .9);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 74px;
}

.brand { display: inline-flex; align-items: center; gap: 12px; margin-right: auto; }
.brand-mark {
  display: inline-flex;
  width: 38px; height: 38px;
  color: var(--copper-bright);
}
.brand-mark svg { width: 100%; height: 100%; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong {
  font-size: 1.06rem;
  font-weight: 750;
  letter-spacing: .16em;
  color: #fff;
}
.brand-text small {
  font-size: .66rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: #93a2b6;
}

.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a {
  position: relative;
  padding: 10px 14px;
  border-radius: 999px;
  font-size: .92rem;
  font-weight: 560;
  color: #c7d2e0;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}
.site-nav a:hover { color: #fff; background: rgba(255, 255, 255, .07); }

.header-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 12px;
  background: rgba(255, 255, 255, .04);
  cursor: pointer;
}
.nav-toggle-bars { display: grid; gap: 4px; justify-items: center; }
.nav-toggle-bars i {
  display: block;
  width: 17px; height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: #c9d4e2;
  padding-block: clamp(56px, 7vw, 96px) clamp(56px, 7vw, 104px);
  background-image:
    radial-gradient(760px 520px at 82% 8%, rgba(217, 146, 79, .2), transparent 68%),
    radial-gradient(620px 420px at 6% 96%, rgba(64, 116, 168, .18), transparent 70%),
    linear-gradient(180deg, #0a111d, #0d1929 55%, #0a111d);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  top: -180px; right: -120px;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(217, 146, 79, .28), transparent 62%);
  filter: blur(10px);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.hero-copy h1 { color: #fff; margin-bottom: 20px; max-width: 22ch; }
.lede {
  color: #b3c0d1;
  font-size: 1.06rem;
  max-width: 60ch;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

.hero-facts {
  display: grid;
  gap: 18px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, .12);
}
.hero-facts li { display: grid; gap: 2px; }
.hero-facts span {
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #8393a8;
}
.hero-facts strong {
  font-size: .98rem;
  font-weight: 600;
  color: #eaf0f7;
}

.hero-figure {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .16);
  box-shadow: 0 40px 80px -50px rgba(0, 0, 0, .95);
  background: #0f1a2a;
}
.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}
.hero-figure figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 22px 22px 20px;
  font-size: .84rem;
  line-height: 1.5;
  color: #e6ecf4;
  background: linear-gradient(to top, rgba(6, 11, 19, .95), rgba(6, 11, 19, .65) 55%, transparent);
}

/* ---------- Identity strip ---------- */
.identity {
  background: var(--ink-soft);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  padding-block: clamp(28px, 3.4vw, 44px);
}
.identity-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}
.identity-grid div { display: grid; gap: 6px; align-content: start; }
.identity-grid dt {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--copper-bright);
}
.identity-grid dd {
  font-size: .95rem;
  color: #dbe3ee;
  line-height: 1.5;
}
.identity-grid dd .cn { color: #93a2b6; margin-top: 4px; }

/* ---------- Product lines ---------- */
.line-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 2.4vw, 30px);
}

.line-card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.line-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
}

.line-media { position: relative; background: var(--cloud-deep); overflow: hidden; }
.line-media img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  transition: transform .4s var(--ease);
}
.line-card:hover .line-media img { transform: scale(1.035); }

.line-media-icon {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 11;
  background:
    radial-gradient(320px 200px at 70% 20%, rgba(217, 146, 79, .18), transparent 70%),
    linear-gradient(150deg, #f7f9fc, #e9eef5);
}
.icon-badge {
  display: grid;
  place-items: center;
  width: 92px; height: 92px;
  border-radius: 50%;
  color: var(--copper);
  background: #fff;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-sm);
}
.icon-badge svg { width: 46px; height: 46px; }

.line-body { padding: 24px 24px 26px; display: grid; gap: 12px; }
.line-body p { color: var(--muted); font-size: .95rem; }

.part-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.part-chips li {
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--cloud);
  font-family: var(--font-mono);
  font-size: .76rem;
  color: #3f4c5e;
  letter-spacing: -.01em;
}

/* ---------- Sourcing band ---------- */
.sourcing-band {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "icon copy"
    "icon chips";
  gap: 6px clamp(20px, 2.4vw, 32px);
  align-items: center;
  margin-top: clamp(24px, 2.8vw, 34px);
  padding: clamp(24px, 3vw, 34px);
  border: 1px solid #ecd9c9;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--copper-soft), #fdf8f3 60%, #fff);
  box-shadow: var(--shadow-xs);
}
.sourcing-icon {
  grid-area: icon;
  display: grid;
  place-items: center;
  width: 68px; height: 68px;
  border-radius: 50%;
  color: var(--copper);
  background: #fff;
  border: 1px solid #eadbcd;
  box-shadow: var(--shadow-xs);
}
.sourcing-icon svg { width: 34px; height: 34px; }
.sourcing-copy { grid-area: copy; }
.sourcing-copy h3 { margin-bottom: 6px; color: var(--ink); }
.sourcing-copy p { color: var(--copper-ink); font-size: .95rem; max-width: 78ch; }
.sourcing-chips { grid-area: chips; margin-top: 12px; }
.sourcing-chips li { background: #fff; border-color: #ecd9c9; color: var(--copper-ink); }

@media (max-width: 640px) {
  .sourcing-band {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "icon" "copy" "chips";
    justify-items: start;
  }
}

/* ---------- Gallery ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: #fff;
  font-size: .86rem;
  font-weight: 580;
  color: #3f4c5e;
  cursor: pointer;
  transition: all .18s var(--ease);
}
.chip:hover { border-color: var(--copper); color: var(--copper-ink); }
.chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 24px);
}

.gallery-card[hidden] { display: none; }

.gallery-trigger {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
  cursor: zoom-in;
  text-align: left;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.gallery-trigger:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
}
.gallery-trigger picture { display: block; background: var(--cloud-deep); }
.gallery-trigger img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  transition: transform .4s var(--ease);
}
.gallery-trigger:hover img { transform: scale(1.04); }

.gallery-caption {
  display: grid;
  gap: 3px;
  padding: 14px 16px 16px;
  border-top: 1px solid var(--line);
}
.gallery-caption strong { font-size: .92rem; font-weight: 620; color: var(--ink); }
.gallery-caption .mono { font-size: .78rem; color: var(--copper-ink); }

/* ---------- Specifications ---------- */
.spec-layout {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(24px, 3.4vw, 48px);
  align-items: start;
  margin-bottom: clamp(36px, 4vw, 56px);
}
.spec-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-xs);
}
.spec-figure img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
.spec-figure figcaption {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--line);
  font-size: .86rem;
  color: var(--muted);
}

.spec-side { display: grid; gap: 20px; }
.spec-panel,
.spec-note {
  padding: clamp(22px, 2.4vw, 30px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--cloud);
}
.spec-panel h3,
.spec-note h3 { margin-bottom: 14px; }
.spec-note { background: var(--copper-soft); border-color: #ecd9c9; }
.spec-note p { color: var(--copper-ink); font-size: .95rem; }

.tick-list { display: grid; gap: 12px; }
.tick-list li {
  position: relative;
  padding-left: 28px;
  font-size: .95rem;
  color: #3f4c5e;
  line-height: 1.5;
}
.tick-list li::before {
  content: "";
  position: absolute;
  left: 0; top: .45em;
  width: 14px; height: 8px;
  border-left: 2px solid var(--copper);
  border-bottom: 2px solid var(--copper);
  transform: rotate(-45deg);
}
.tick-list strong { color: var(--ink); font-weight: 640; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-xs);
  -webkit-overflow-scrolling: touch;
}
.parts-table { width: 100%; min-width: 720px; border-collapse: collapse; }
.parts-table caption {
  padding: 18px 20px;
  text-align: left;
  font-size: .82rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}
.parts-table th,
.parts-table td {
  padding: 13px 20px;
  text-align: left;
  font-size: .92rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.parts-table thead th {
  position: sticky;
  top: 0;
  background: var(--cloud);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #4a586b;
  font-weight: 700;
}
.parts-table tbody th { font-weight: 600; color: var(--ink); }
.parts-table tbody td { color: #465367; }
.parts-table tbody tr:nth-child(even) { background: #fafbfd; }
.parts-table tbody tr:hover { background: var(--copper-soft); }
.parts-table tbody tr:last-child th,
.parts-table tbody tr:last-child td { border-bottom: 0; }

.table-footnote {
  margin-top: 16px;
  font-size: .84rem;
  color: var(--muted);
  max-width: 82ch;
}
.table-wrap-spaced { margin-top: clamp(28px, 3.4vw, 44px); }

/* ---------- Capability ---------- */
.capability-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  gap: clamp(28px, 4vw, 60px);
  align-items: start;
}

.capability-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 28px; }
.capability-list li {
  padding-top: 18px;
  border-top: 2px solid rgba(217, 146, 79, .5);
}
.capability-list h3 { color: #fff; margin-bottom: 8px; font-size: 1rem; }
.capability-list p { color: #9fb0c4; font-size: .92rem; }

.capability-photos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.capability-photos figure { overflow: hidden; border-radius: var(--radius); background: var(--ink-lift); }
.capability-photos figure:first-child { grid-row: span 2; }
.capability-photos img {
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform .5s var(--ease);
}
.capability-photos figure:first-child img { aspect-ratio: 3 / 4; }
.capability-photos figure:hover img { transform: scale(1.04); }
.capability-photos figcaption {
  padding: 12px 16px 14px;
  font-size: .8rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: #93a2b6;
  border-top: 1px solid rgba(255, 255, 255, .08);
}

.process {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 20px;
  margin-top: clamp(40px, 5vw, 64px);
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, .12);
}
.process li { display: grid; gap: 8px; align-content: start; }
.process .step {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--copper-bright);
}
.process h4 { color: #fff; font-size: .95rem; }
.process p { color: #93a2b6; font-size: .86rem; line-height: 1.5; }

/* ---------- Quality & compliance ---------- */
.quality-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
  gap: clamp(24px, 3.4vw, 48px);
  align-items: start;
}
.doc-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.doc-card {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-xs);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.doc-card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.doc-card h3 { margin-bottom: 8px; font-size: 1rem; }
.doc-card p { font-size: .91rem; color: var(--muted); }

.verify-card {
  padding: clamp(24px, 2.6vw, 32px);
  border-radius: var(--radius);
  background: var(--ink);
  color: #c5d0de;
  box-shadow: var(--shadow-md);
}
.verify-card h3 { color: #fff; margin-bottom: 18px; }
.verify-list { display: grid; gap: 14px; }
.verify-list div { display: grid; gap: 3px; }
.verify-list dt {
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--copper-bright);
}
.verify-list dd { font-size: .92rem; line-height: 1.5; }
.verify-list dd .cn,
.verify-list dd.cn { color: #9fb0c4; }
.verify-note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .14);
  font-size: .87rem;
  color: #a9b6c7;
  line-height: 1.55;
}
.verify-note strong { color: #fff; }
.verify-note a { color: var(--copper-bright); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Company ---------- */
.company-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(28px, 4vw, 60px);
  align-items: start;
}
.company-copy { display: grid; gap: 18px; max-width: 66ch; }
.company-copy p { color: #3f4c5e; }

.company-side { display: grid; gap: 20px; }
.trade-card,
.stat-card {
  padding: clamp(22px, 2.4vw, 30px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow-xs);
}
.trade-card h3,
.stat-card h3 { margin-bottom: 18px; }
.trade-card dl { display: grid; gap: 14px; }
.trade-card dl div {
  display: grid;
  grid-template-columns: minmax(0, 9rem) minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.trade-card dl div:last-child { border-bottom: 0; padding-bottom: 0; }
.trade-card dt { font-size: .85rem; font-weight: 650; color: var(--ink); }
.trade-card dd { font-size: .92rem; color: var(--muted); }

/* ---------- Contact ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(26px, 3.6vw, 52px);
  align-items: start;
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 3vw, 36px);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .035);
  border: 1px solid rgba(255, 255, 255, .13);
}
.field-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.field { display: grid; gap: 8px; }
.field label {
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #9fb0c4;
  font-weight: 620;
}
.field .req { color: var(--copper-bright); }
.field input,
.field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, .16);
  background: rgba(8, 13, 22, .6);
  color: #eef3f8;
  font-size: .96rem;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder,
.field textarea::placeholder { color: #6d7d92; }
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--copper-bright);
  background: rgba(8, 13, 22, .85);
}
.field.has-error input,
.field.has-error textarea { border-color: #e0755a; }

.form-hint { font-size: .84rem; color: #8d9cb0; }
.form-hint .mono { color: var(--copper-bright); }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.form-status { font-size: .86rem; color: var(--copper-bright); }
.form-status.is-error { color: #ef8a70; }

.contact-side { display: grid; gap: 18px; }
.contact-block {
  padding: clamp(22px, 2.4vw, 28px);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, .13);
  background: rgba(255, 255, 255, .035);
}
.contact-block h3 { color: #fff; margin-bottom: 14px; }
.contact-block p { color: #b3c0d1; font-size: .95rem; }
.contact-block .cn { margin-top: 8px; color: #8d9cb0; }
.contact-block .link-arrow { margin-top: 14px; }

.contact-list { display: grid; gap: 14px; }
.contact-list div { display: grid; gap: 3px; }
.contact-list dt {
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--copper-bright);
}
.contact-list dd { font-size: .95rem; color: #dbe3ee; }
.contact-list a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: rgba(217, 146, 79, .5); }
.contact-list a:hover { color: #fff; }
.small-print { margin-top: 16px; font-size: .78rem; color: #7d8da5; }

/* ---------- Footer ---------- */
.site-footer {
  background: #070d16;
  color: #93a2b6;
  padding-block: clamp(48px, 5vw, 72px) 32px;
  border-top: 1px solid rgba(255, 255, 255, .08);
}
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: clamp(28px, 4vw, 64px);
}
.footer-brand .brand-mark { width: 34px; height: 34px; margin-bottom: 14px; }
.footer-brand p { font-size: .9rem; line-height: 1.7; }
.footer-brand strong { color: #fff; font-weight: 620; }
.footer-brand .cn { color: #8494aa; }
.footer-brand .mono { color: #b3c0d1; }

.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.footer-nav h3 {
  margin-bottom: 14px;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #fff;
}
.footer-nav ul { display: grid; gap: 10px; }
.footer-nav li { font-size: .88rem; }
.footer-nav a:hover { color: #fff; text-decoration: underline; text-underline-offset: 3px; }

.footer-bottom {
  margin-top: clamp(32px, 4vw, 52px);
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  display: grid;
  gap: 12px;
}
.footer-bottom p { font-size: .82rem; }
.disclaimer { color: #6f7f95; max-width: 96ch; line-height: 1.6; }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(8px, 2vw, 24px);
  padding: clamp(16px, 3vw, 40px);
  background: rgba(5, 9, 16, .93);
  backdrop-filter: blur(6px);
}
.lightbox[hidden] { display: none; }
.lightbox-figure {
  display: grid;
  gap: 14px;
  justify-items: center;
  max-height: 100%;
}
.lightbox-figure img {
  max-width: 100%;
  max-height: min(74vh, 780px);
  width: auto;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, .14);
  background: #0d1522;
}
.lightbox-figure figcaption {
  display: grid;
  gap: 4px;
  text-align: center;
  color: #93a2b6;
  font-size: .88rem;
}
.lightbox-figure strong { color: #fff; font-size: 1rem; }
.lightbox-close {
  position: absolute;
  top: 18px; right: 22px;
  width: 44px; height: 44px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 50%;
  background: rgba(255, 255, 255, .06);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}
.lightbox-nav {
  width: 52px; height: 52px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 50%;
  background: rgba(255, 255, 255, .06);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color .18s var(--ease);
}
.lightbox-nav:hover,
.lightbox-close:hover { background: rgba(255, 255, 255, .16); }

body.is-locked { overflow: hidden; }

/* ---------- Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .btn, .line-card, .gallery-trigger, .line-media img, .capability-photos img { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .line-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .process { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
  .identity-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 84px; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    display: grid;
    gap: 4px;
    padding: 14px clamp(20px, 4vw, 40px) 22px;
    background: rgba(9, 15, 25, .98);
    border-bottom: 1px solid rgba(255, 255, 255, .1);
    box-shadow: 0 30px 60px -40px rgba(0, 0, 0, .95);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .site-nav a { padding: 13px 8px; border-bottom: 1px solid rgba(255, 255, 255, .07); border-radius: 0; font-size: 1rem; }

  .hero-inner { grid-template-columns: minmax(0, 1fr); }
  .hero-figure { max-width: 520px; }
  .hero-copy h1 { max-width: none; }
  .spec-layout,
  .capability-layout,
  .quality-layout,
  .company-layout,
  .contact-layout,
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  body { font-size: 16px; }
  .gallery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .capability-list { grid-template-columns: minmax(0, 1fr); }
  .process { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc-grid { grid-template-columns: minmax(0, 1fr); }
  .field-row { grid-template-columns: minmax(0, 1fr); }
  .trade-card dl div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .lightbox { grid-template-columns: minmax(0, 1fr); justify-items: center; }
  .lightbox-nav { display: none; }
  .lightbox-figure img { max-height: 62vh; }
}

@media (max-width: 520px) {
  .line-grid { grid-template-columns: minmax(0, 1fr); }
  .gallery-grid { grid-template-columns: minmax(0, 1fr); }
  .identity-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .btn { width: 100%; }
  .hero-actions { flex-direction: column; }
  .header-actions .btn { display: none; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .lightbox, .hero-actions, .filter-bar, .contact-form { display: none !important; }
  body { color: #000; font-size: 11pt; }
  .section, .hero { padding-block: 12pt; }
  .section-dark, .hero, .site-footer { background: #fff !important; color: #000 !important; }
  .section-dark h2, .section-dark h3, .hero h1, .footer-brand strong { color: #000 !important; }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}