/* =====================================================
   Yueyang Technology — Global Stylesheet
   Industrial catalogue design language
   ===================================================== */

:root {
  --paper: #FAFAF7;
  --white: #FFFFFF;
  --ink: #12181A;
  --ink-soft: #4C5654;
  --ink-mute: #8E9894;
  --ink-faint: #B0B8B4;
  --green: #1D5C46;
  --green-soft: #7FBFA3;
  --line: #E4E5DE;
  --line-strong: #D3D5CC;
  --dark: #12181A;
  --dark-2: #0C1011;
  --dark-line: #262E2B;
  --dark-text: #A9B3AE;
  --dark-head: #F4F6F3;
  --radius: 2px;
  --pad-x: clamp(20px, 5vw, 64px);
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --sans: "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --disp: "Archivo", "Arial Black", sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: 1440px; margin: 0 auto; padding: 0 var(--pad-x); }

/* ---------- typography ---------- */
h1, h2, h3 { font-family: var(--disp); font-weight: 700; letter-spacing: -0.02em; line-height: 1.12; }
.h1 { font-size: clamp(34px, 4.4vw, 64px); letter-spacing: -0.035em; }
.h2 { font-size: clamp(26px, 3vw, 42px); letter-spacing: -0.03em; }
.h3 { font-size: clamp(20px, 2.2vw, 28px); }
.lead { font-size: clamp(16px, 1.4vw, 18px); color: var(--ink-soft); line-height: 1.65; }

.eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 10.5px; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase; color: #C8202C;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: #C8202C; }
.eyebrow--bare::before { display: none; }

/* 导航 Contact 旁红色小字（24h Response） */
.nav-flag {
  color: #C8202C;
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-left: 6px;
  position: relative;
  top: -6px;
  white-space: nowrap;
}
@media (max-width: 860px) {
  .nav-flag { display: none; }
}

.mono-label {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-mute);
}

/* ---------- announcement bar ---------- */
.announce {
  display: block;
  background: var(--ink); color: #DCE4DF;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.18em;
  text-align: center; padding: 10px 16px; text-transform: uppercase;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.96); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; gap: 24px;
}
.brand { display: grid; grid-template-columns: auto auto; grid-template-rows: auto auto; column-gap: 11px; align-items: center; line-height: 1.15; }
.brand__mark { grid-row: 1 / span 2; grid-column: 1; width: 40px; height: 40px; }
.brand__word { grid-column: 2; font-family: var(--disp); font-weight: 800; font-size: 21px; letter-spacing: 0.06em; }
.brand__sub { grid-column: 2; font-family: var(--mono); font-size: 8px; letter-spacing: 0.16em; color: var(--ink-mute); margin-top: 2px; }

.main-nav { display: flex; gap: 32px; }
.main-nav a {
  font-size: 14.5px; font-weight: 500; color: var(--ink-soft);
  padding: 6px 0; border-bottom: 2px solid transparent; transition: color .15s;
}
.main-nav a:hover { color: var(--ink); }
.main-nav a.is-active { color: var(--ink); border-bottom-color: var(--green); }

/* dropdown (Products) */
.nav-item { position: relative; display: flex; align-items: center; }
.nav-item.has-drop > a::after { content: "\25BE"; font-size: 8px; margin-left: 5px; color: var(--ink-soft); }
.drop-toggle { display: none; }
.drop {
  position: absolute; top: calc(100% + 12px); left: -18px; min-width: 252px;
  background: #fff; border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 18px 40px rgba(18,24,26,.12); padding: 8px;
  display: flex; flex-direction: column;
  opacity: 0; visibility: hidden; transform: translateY(6px);
  transition: opacity .16s ease .12s, transform .16s ease .12s, visibility 0s .3s;
  z-index: 70;
}
.drop::before { content: ""; position: absolute; top: -14px; left: 0; right: 0; height: 14px; }
.nav-item.has-drop:hover .drop,
.nav-item.has-drop:focus-within .drop {
  opacity: 1; visibility: visible; transform: none;
  transition: opacity .16s ease .1s, transform .16s ease .1s;
}
.drop a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 5px; border-bottom: none;
  font-size: 13.5px; font-weight: 500; color: var(--ink-soft); white-space: nowrap;
}
.drop a:hover { background: var(--paper); color: var(--ink); }
.drop a .no { font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; color: #C8202C; }
.drop a.drop-all {
  margin-top: 4px; border-top: 1px solid var(--line); border-radius: 0 0 5px 5px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink);
}

.header-actions { display: flex; align-items: center; gap: 18px; }
.header-actions .lang { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-soft); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: var(--radius); border: 1px solid transparent;
  font-size: 14px; font-weight: 600; line-height: 1; cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  white-space: nowrap;
}
.btn--dark { background: var(--ink); color: #fff; }
.btn--dark:hover { background: var(--green); }
.btn--ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn--ghost:hover { border-color: var(--ink); }
/* 深色区块里的描边按钮：反白，否则文字看不见 */
.section--dark .btn--ghost { border-color: rgba(255, 255, 255, 0.3); color: var(--dark-head); }
.section--dark .btn--ghost:hover { border-color: var(--dark-head); background: rgba(255, 255, 255, 0.08); }
.btn--green { background: var(--green); color: #fff; }
.btn--green:hover { background: #164836; }
.btn--sm { padding: 10px 18px; font-size: 13px; }

.nav-toggle { display: none; background: none; border: 1px solid var(--line-strong); border-radius: 2px; width: 40px; height: 36px; cursor: pointer; position: relative; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 9px; right: 9px; height: 2px; background: var(--ink);
}
.nav-toggle span { top: 17px; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

/* ---------- hero ---------- */
.hero { padding: clamp(48px, 7vw, 88px) 0 0; }
.hero__grid { display: grid; grid-template-columns: 1.22fr 0.78fr; gap: clamp(32px, 5vw, 64px); align-items: start; }
.hero h1 { margin: 22px 0 20px; }
/* 首页主标题收一档字号，保证固定两行不孤行 */
.hero .h1 { font-size: clamp(34px, 3.5vw, 50px); }
@media (max-width: 860px) {
  .hero .h1 br { display: none; } /* 手机端去掉强制断行，自然换行 */
}
.hero .lead { max-width: 560px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.figure { display: flex; flex-direction: column; gap: 10px; }
.figure__img {
  border: 1px solid #E0E1DA; border-radius: var(--radius);
  overflow: hidden; background: var(--paper);
}
.figure__img img { width: 100%; height: 100%; object-fit: cover; }
.figure figcaption, .figcap {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.12em;
  color: var(--ink-mute); text-transform: uppercase;
}
.figcap::before { content: ""; width: 8px; height: 1px; background: #B9C0BC; }

/* spec strip under hero */
.spec-strip { border-top: 1px solid var(--line); margin-top: clamp(40px, 6vw, 72px); }
.spec-strip__grid { display: grid; grid-template-columns: repeat(4, 1fr); padding: 26px 0 30px; }
.spec-strip__cell { padding: 0 32px; border-left: 1px solid var(--line); }
.spec-strip__cell:first-child { padding-left: 0; border-left: none; }
.spec-strip__cell .v { font-family: var(--disp); font-weight: 600; font-size: clamp(15px, 1.3vw, 19px); margin-top: 6px; letter-spacing: -0.01em; }
.spec-strip__cell .l { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.14em; color: #C8202C; text-transform: uppercase; }

/* ---------- sections ---------- */
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section--paper { background: var(--paper); }
.section--dark { background: var(--dark); color: var(--dark-head); }
.section--dark .lead { color: var(--dark-text); }

.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; margin-bottom: clamp(28px, 4vw, 48px); }
.section-head .h2 { margin-top: 14px; }
.section-head .side-note { font-family: var(--mono); font-size: 9.5px; letter-spacing: .13em; color: var(--ink-faint); text-transform: uppercase; white-space: nowrap; }
.section--dark .side-note { color: #63706A; }

/* ---------- product cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.p-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: transform .18s, box-shadow .18s; }
.p-card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(18,24,26,.08); }
.p-card__media { aspect-ratio: 41/30; overflow: hidden; background: var(--paper); }
.p-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s; }
.p-card:hover .p-card__media img { transform: scale(1.03); }
.p-card__body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.p-card__meta { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; }
.p-card__meta .idx { color: #9AA29E; }
.p-card__meta .tag { color: var(--green); font-weight: 500; }
.p-card__name { font-family: var(--disp); font-weight: 600; font-size: 17px; line-height: 1.3; }
.p-card__spec { font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; color: var(--ink-mute); text-transform: uppercase; }
.p-card__desc { font-size: 13.5px; color: var(--ink-soft); line-height: 1.55; }

/* ---------- dark spec table ---------- */
.spec-split { display: grid; grid-template-columns: 1fr 540px; gap: clamp(40px, 6vw, 80px); align-items: start; }
.spec-table { width: 100%; }
.spec-table__row { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 17px 0; border-bottom: 1px solid var(--dark-line); }
.spec-table__row:first-of-type { border-top: 1px solid var(--dark-line); }
.spec-table__k { font-family: var(--mono); font-size: 10px; letter-spacing: .13em; color: #8E9A94; text-transform: uppercase; }
.spec-table__v { font-family: var(--mono); font-size: 12.5px; color: #E6EBE7; text-align: right; }
.spec-table--light .spec-table__row { border-color: var(--line); }
.spec-table--light .spec-table__row:first-of-type { border-top-color: var(--line); }
.spec-table--light .spec-table__k { color: var(--ink-mute); }
.spec-table--light .spec-table__v { color: var(--ink); }

.cap-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: clamp(32px, 5vw, 56px); }
.cap-list .k { font-family: var(--mono); font-size: 9.5px; font-weight: 500; letter-spacing: .15em; color: var(--green-soft); text-transform: uppercase; }
.cap-list .t { font-size: 14px; color: #8E9A94; line-height: 1.6; margin-top: 6px; }

/* ---------- stats ---------- */
.stats { border-top: 1px solid var(--line); }
.stats--dark { border-top-color: var(--dark-line); }
.stats__grid { display: flex; justify-content: space-between; gap: 24px; padding: 30px 0 0; flex-wrap: wrap; }
.stat .v { font-family: var(--disp); font-weight: 700; font-size: clamp(28px, 3vw, 40px); letter-spacing: -0.03em; }
.stat .l { font-family: var(--mono); font-size: 9.5px; letter-spacing: .14em; color: #C8202C; margin-top: 6px; text-transform: uppercase; }
.stats--dark .stat .v { color: var(--dark-head); }
.stats--dark .stat .l { color: #63706A; }

/* ---------- features / steps ---------- */
.feat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px clamp(24px, 4vw, 60px); }
.feat .idx { font-family: var(--mono); font-size: 10px; font-weight: 500; letter-spacing: .14em; color: #C8202C; }
.feat .t { font-family: var(--disp); font-weight: 600; font-size: 17px; margin-top: 8px; }
.feat .x { font-size: 14px; color: var(--ink-soft); line-height: 1.62; margin-top: 6px; max-width: 60ch; }
.feat-grid--3 { grid-template-columns: repeat(3, 1fr); }

/* 首页 hero 下的三个关键数字 */
.hero-stats {
  display: flex; flex-wrap: wrap; gap: 18px 56px;
  margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line);
}
.hero-stats b {
  display: block; font-family: var(--disp); font-weight: 700;
  font-size: clamp(22px, 2vw, 28px); letter-spacing: -0.03em; color: var(--ink);
}
.hero-stats span {
  display: block; margin-top: 4px;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: #C8202C;
}

/* 首页四步合作流程 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.steps .no {
  font-family: var(--mono); font-size: 10px; font-weight: 500;
  letter-spacing: 0.14em; color: #C8202C;
  border-top: 2px solid #C8202C; padding-top: 14px;
}
.steps .t { font-family: var(--disp); font-weight: 600; font-size: 17px; margin-top: 10px; }
.steps .x { font-size: 14px; color: var(--ink-soft); line-height: 1.62; margin-top: 6px; }
.fig-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 44px; }
.feat--rule { border-top: 1px solid var(--line-strong); padding-top: 18px; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step { border-top: 1px solid var(--line-strong); padding-top: 16px; }
.step .num { font-family: var(--disp); font-weight: 700; font-size: 24px; color: var(--green); letter-spacing: -0.02em; }
.step .t { font-family: var(--disp); font-weight: 600; font-size: 16.5px; margin-top: 10px; }
.step .x { font-size: 13.5px; color: var(--ink-soft); line-height: 1.6; margin-top: 6px; }

/* ---------- QA table (dark) ---------- */
.qa-rows { display: flex; flex-direction: column; }
.qa-row { display: flex; gap: clamp(20px, 3vw, 40px); padding: 20px 0; border-bottom: 1px solid var(--dark-line); align-items: baseline; }
.qa-row:first-child { border-top: 1px solid var(--dark-line); }
.qa-row .k { font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: .13em; color: var(--green-soft); min-width: 180px; text-transform: uppercase; }
.qa-row .v { font-size: 13.5px; color: #8E9A94; line-height: 1.6; }

/* ---------- product list page ---------- */
.prod-row { border-top: 1px solid var(--line); padding: clamp(28px, 4vw, 40px) 0; display: grid; grid-template-columns: 240px 1fr 300px; gap: clamp(24px, 4vw, 48px); }
.prod-row__media { display: block; }
.prod-row__media img { width: 100%; aspect-ratio: 41/30; object-fit: cover; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); transition: transform .35s; }
.prod-row__media:hover img { transform: scale(1.03); }
.prod-row:last-of-type { border-bottom: 1px solid var(--line); }
.prod-row .ix { font-family: var(--mono); font-size: 9.5px; font-weight: 500; letter-spacing: .15em; color: #C8202C; text-transform: uppercase; }
.prod-row .nm { font-family: var(--disp); font-weight: 700; font-size: clamp(21px, 2vw, 27px); letter-spacing: -0.02em; margin-top: 10px; }
.prod-row .ds { font-size: 14.5px; color: var(--ink-soft); margin-top: 10px; max-width: 64ch; }
.prod-row .quick { display: flex; flex-direction: column; gap: 9px; padding-top: 4px; }
.prod-row .quick span { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; }
.prod-row .quick span:first-child { color: var(--ink); }
.prod-row .quick span + span { color: var(--ink-soft); }
.prod-row a.rowlink { display: inline-flex; align-items: center; gap: 8px; margin-top: 14px; font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; color: var(--ink); text-transform: uppercase; }
.prod-row a.rowlink:hover { color: var(--green); }

/* ---------- product detail hero ---------- */
.crumb { background: var(--paper); border-bottom: 1px solid var(--line); }
.crumb .container { padding-top: 14px; padding-bottom: 14px; font-family: var(--mono); font-size: 9.5px; letter-spacing: .13em; color: var(--ink-mute); text-transform: uppercase; }
.crumb a { color: var(--ink-mute); }
.crumb a:hover { color: var(--ink); }
.crumb .sep { margin: 0 10px; color: var(--line-strong); }

.pd-hero { padding: clamp(40px, 5vw, 64px) 0 clamp(40px, 5vw, 64px); }
.pd-hero__grid { display: grid; grid-template-columns: 1fr 500px; gap: clamp(32px, 5vw, 64px); align-items: start; }
.pd-hero .tagline { font-size: 19px; font-weight: 500; color: var(--green); margin-top: 4px; }
.pd-hero .intro { font-size: 15.5px; color: var(--ink-soft); line-height: 1.7; margin-top: 16px; }
.key-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 18px; margin-top: 26px; }
.key-specs .cell { border-top: 1px solid var(--line); padding-top: 8px; }
.key-specs .k { font-family: var(--mono); font-size: 9px; letter-spacing: .14em; color: #C8202C; text-transform: uppercase; }
.key-specs .v { font-family: var(--disp); font-weight: 500; font-size: 15px; margin-top: 4px; }
.pd-hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.pd-figure { position: relative; }
.pd-figure img { aspect-ratio: 5/4; }

.opt-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(40px, 6vw, 80px); align-items: start; }
.opt-list { display: flex; flex-direction: column; gap: 22px; }
.opt .k { font-family: var(--mono); font-size: 9px; letter-spacing: .14em; color: #C8202C; text-transform: uppercase; }
.opt .v { font-size: 14px; color: var(--ink-soft); line-height: 1.65; margin-top: 5px; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--dark); color: var(--dark-head); }
.cta-band .container { display: flex; justify-content: space-between; align-items: center; gap: 40px; padding-top: clamp(40px, 5vw, 56px); padding-bottom: clamp(40px, 5vw, 56px); }
.cta-band h2 { font-size: clamp(22px, 2.4vw, 28px); letter-spacing: -0.02em; }
.cta-band .meta { font-family: var(--mono); font-size: 9.5px; letter-spacing: .13em; color: var(--green-soft); margin-top: 12px; text-transform: uppercase; }

/* QC 检测图三联 */
.qc-shots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 36px; }
.qc-shot { margin: 0; }
.qc-shot img { width: 100%; aspect-ratio: 41 / 30; object-fit: cover; border-radius: 6px; border: 1px solid var(--line); display: block; }
.qc-shot figcaption { font-family: var(--mono); font-size: 9px; letter-spacing: .14em; color: #C8202C; text-transform: uppercase; margin-top: 10px; }
.qc-shot--ph .ph { width: 100%; aspect-ratio: 41 / 30; border-radius: 6px; border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; }
.qc-shot--ph .ph::after { content: ""; width: 34px; height: 34px; border-radius: 50%; background: rgba(18, 24, 26, 0.10); }
.qc-shot--ph:nth-child(1) .ph { background: linear-gradient(135deg, #E9EBE4, #DCE0D6); }
.qc-shot--ph:nth-child(2) .ph { background: linear-gradient(135deg, #E3E8E4, #D3DCD4); }
.qc-shot--ph:nth-child(3) .ph { background: linear-gradient(135deg, #E6EAE9, #D6DEE0); }

/* quality control tests */
.qc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 32px; margin-top: 40px; }
.qc-test { border-top: 1px solid var(--line-strong); padding-top: 16px; }
.qc-test .no { font-family: var(--mono); font-size: 10px; font-weight: 500; letter-spacing: .15em; color: #C8202C; }
.qc-test .t { font-family: var(--disp); font-weight: 600; font-size: 16.5px; margin-top: 8px; }
.qc-test .x { font-size: 13.5px; color: var(--ink-soft); line-height: 1.6; margin-top: 6px; }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 380px 1fr; gap: clamp(40px, 6vw, 80px); align-items: start; }
.c-item { margin-bottom: 26px; }
.c-item .k { font-family: var(--mono); font-size: 9px; letter-spacing: .14em; color: #C8202C; text-transform: uppercase; }
.c-item .v { font-family: var(--disp); font-weight: 600; font-size: 18px; margin-top: 5px; }
.c-item .n { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }

.qform { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 32px 34px; }
.qform h3 { font-size: 22px; letter-spacing: -0.02em; }
.qform .sub { font-size: 13.5px; color: var(--ink-soft); margin-top: 6px; }
.qform .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 16px; }
.qform .field { display: flex; flex-direction: column; gap: 7px; margin-top: 16px; }
.qform label { font-family: var(--mono); font-size: 9px; letter-spacing: .14em; color: var(--ink-mute); text-transform: uppercase; }
.qform input, .qform textarea {
  font-family: var(--sans); font-size: 14px; color: var(--ink);
  border: 1px solid #DCDDD5; border-radius: var(--radius); background: #fff;
  padding: 12px; width: 100%;
}
.qform input:focus, .qform textarea:focus { outline: none; border-color: var(--green); }
.qform textarea { min-height: 96px; resize: vertical; }
.qform .chips { display: flex; flex-wrap: wrap; gap: 8px; }
.qform .chips label {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--sans); font-size: 12.5px; letter-spacing: 0; text-transform: none; color: var(--ink);
  border: 1px solid #DCDDD5; background: #fff; border-radius: 2px; padding: 8px 12px; cursor: pointer;
}
.qform .chips input { width: auto; accent-color: var(--green); }
.qform .submit { width: 100%; margin-top: 20px; padding: 16px; }
.qform .hp { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* ---------- FAQ ---------- */
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px 20px; }
.faq .q { font-family: var(--disp); font-weight: 600; font-size: 16px; }
.faq .a { font-size: 13.5px; color: var(--ink-soft); line-height: 1.65; margin-top: 8px; max-width: 62ch; }

/* ---------- news ---------- */
.news-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px 20px; }
.news-card { border-top: 1px solid var(--line-strong); padding-top: 18px; display: flex; flex-direction: column; gap: 8px; }
.news-card .date { font-family: var(--mono); font-size: 9.5px; letter-spacing: .13em; color: #C8202C; text-transform: uppercase; }
.news-card h3 { font-size: 19px; letter-spacing: -0.015em; line-height: 1.3; }
.news-card h3 a:hover { color: var(--green); }
.news-card .ex { font-size: 14px; color: var(--ink-soft); line-height: 1.6; }
.news-card .more { font-family: var(--mono); font-size: 10px; letter-spacing: .14em; color: var(--green); text-transform: uppercase; }
.news-thumb {
  display: block; margin: 4px 0 2px;
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; aspect-ratio: 4 / 1; background: var(--paper);
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .35s ease; }
.news-thumb:hover img { transform: scale(1.04); }

/* 文章详情页配图 */
.article-fig {
  margin: 26px 0 10px; border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; background: var(--paper);
}
.article-fig img { width: 100%; display: block; }
.article img { max-width: 100%; max-height: 760px; width: auto; height: auto; display: block; margin: 22px auto; border: 1px solid var(--line); border-radius: var(--radius); }

.article { max-width: 760px; margin: 0 auto; }
.article .date { font-family: var(--mono); font-size: 10px; letter-spacing: .13em; color: #C8202C; text-transform: uppercase; }
.article h1 { font-size: clamp(28px, 3.4vw, 42px); margin: 14px 0 24px; }
.article p { font-size: 16px; line-height: 1.75; color: #2A3230; margin-bottom: 20px; }
.article h2 { font-size: 23px; margin: 36px 0 14px; letter-spacing: -0.02em; }
.article ul { list-style: disc; padding-left: 22px; margin-bottom: 20px; }
.article li { font-size: 15.5px; line-height: 1.7; color: #2A3230; margin-bottom: 6px; }
.article strong { color: var(--ink); }
.article .backlink { display: inline-flex; gap: 8px; align-items: center; font-family: var(--mono); font-size: 10.5px; letter-spacing: .13em; color: var(--ink); text-transform: uppercase; margin-bottom: 0; margin-right: 16px; }
.article .backlink:hover { color: var(--green); }
.article .date { margin-right: 0; }
.article .backlink + .date::before { content: "/"; margin-right: 16px; color: var(--ink-faint); }
.article .related { border-top: 1px solid var(--line); margin-top: 44px; padding-top: 24px; }
.article .related .k { font-family: var(--mono); font-size: 9.5px; letter-spacing: .15em; color: var(--green); text-transform: uppercase; margin-bottom: 12px; }
.article .related a { display: block; font-family: var(--disp); font-weight: 600; font-size: 15.5px; margin-bottom: 8px; }
.article .related a:hover { color: var(--green); }

/* ---------- footer ---------- */
.site-footer { background: var(--dark-2); color: var(--dark-text); overflow: hidden; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: clamp(28px, 4vw, 64px); padding: clamp(48px, 6vw, 72px) 0 48px; }
.site-footer .brand__word { color: var(--dark-head); }
.footer-group .k { font-family: var(--mono); font-size: 9.5px; letter-spacing: .16em; color: #4E5952; text-transform: uppercase; margin-bottom: 14px; }
.footer-group a, .footer-group span { display: block; font-size: 13px; color: var(--dark-text); margin-bottom: 10px; line-height: 1.5; }
.footer-group a:hover { color: #fff; }
.footer-group .who { color: var(--dark-head); font-weight: 600; }
.footer-social { display: flex; gap: 9px; margin-top: 18px; }
.footer-social a {
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%; margin: 0;
  border: 1px solid #2C3533; background: #1A2120; transition: .18s;
}
.footer-social a:hover { background: var(--green); border-color: var(--green); }
.footer-social svg { width: 16px; height: 16px; fill: var(--dark-text); transition: .18s; }
.footer-social a:hover svg { fill: #fff; }
.footer-bottom { border-top: 1px solid #222A28; }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 16px; padding-top: 20px; padding-bottom: 20px; font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; color: #4E5952; text-transform: uppercase; flex-wrap: wrap; }
.footer-giant { font-family: var(--disp); font-weight: 800; font-size: clamp(80px, 14vw, 208px); letter-spacing: -0.02em; line-height: 0.78; text-align: center; color: #161D1E; user-select: none; margin-bottom: -0.12em; }

/* WhatsApp float */
.wa-float {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 56px; height: 56px; border-radius: 50%;
  background: #25D366; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 20px rgba(0,0,0,.25); transition: transform .15s;
}
.wa-float:hover { transform: scale(1.06); }
.wa-float svg { width: 30px; height: 30px; fill: #fff; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-split { grid-template-columns: 1fr; }
  .pd-hero__grid { grid-template-columns: 1fr; }
  .pd-figure img { aspect-ratio: 16/10; }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 28px 20px; }
  .qc-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 28px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .opt-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .main-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; gap: 0; padding: 8px 0;
    box-shadow: 0 12px 30px rgba(18,24,26,.08);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px var(--pad-x); border-bottom: none; border-top: 1px solid var(--line); }
  .nav-item { display: block; }
  .nav-item.has-drop > a { display: inline-block; }
  .nav-item.has-drop > a::after { content: none; }
  .drop-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 34px; height: 34px; margin-left: 8px; vertical-align: middle;
    background: none; border: 1px solid var(--line-strong); border-radius: 4px;
    font-size: 12px; color: var(--ink-soft); cursor: pointer;
  }
  .drop {
    position: static; display: none; min-width: 0; padding: 0 0 4px;
    background: transparent; border: none; box-shadow: none;
    opacity: 1; visibility: visible; transform: none;
  }
  .drop::before { content: none; }
  .drop.open { display: flex; }
  .drop a { padding: 11px var(--pad-x) 11px 40px; border-radius: 0; border-top: none; font-size: 13px; }
  .drop a.drop-all { padding-left: 40px; }
  .nav-toggle { display: block; }
  .header-actions .lang { display: none; }
  .hero__grid { grid-template-columns: 1fr; }
  .spec-strip__grid { grid-template-columns: 1fr 1fr; gap: 20px 0; }
  .spec-strip__cell { padding: 0 20px; }
  .spec-strip__cell:nth-child(odd) { padding-left: 0; border-left: none; }
  .spec-strip__cell:nth-child(n+3) { border-top: 1px solid var(--line); padding-top: 18px; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .prod-row { grid-template-columns: 1fr; }
  .faq-grid, .news-grid, .feat-grid, .qc-shots { grid-template-columns: 1fr; }
  .feat-grid--3, .steps, .fig-row { grid-template-columns: 1fr; gap: 22px; }
  .hero-stats { gap: 14px 32px; }
  .qc-grid { grid-template-columns: 1fr; gap: 22px; }
  .cap-list { grid-template-columns: 1fr; gap: 22px; }
  .cta-band .container { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .card-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .key-specs { grid-template-columns: 1fr 1fr; }
  .qform .row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .stats__grid { gap: 20px 32px; }
  .wa-float { right: 14px; bottom: 14px; width: 50px; height: 50px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto; }
}