/* =========================================================
   畔达工业科技 · 官网原型样式表
   ========================================================= */

:root {
  --c-ink: #0B1526;
  --c-body: #43525F;
  --c-muted: #7A8894;
  --c-line: #E4E9F0;
  --c-line-soft: #EFF3F8;
  --c-bg: #FFFFFF;
  --c-soft: #F6F9FC;
  --c-navy: #071A2F;
  --c-navy-2: #0C2743;
  --c-brand: #0E4FD1;
  --c-brand-deep: #0A3BA6;
  --c-brand-soft: #EAF1FE;
  --c-cyan: #00B6C9;
  --c-cyan-soft: #E4F9FB;

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;

  --sh-sm: 0 1px 2px rgba(11, 21, 38, .05), 0 6px 16px rgba(11, 21, 38, .04);
  --sh-md: 0 10px 34px rgba(11, 21, 38, .09);
  --sh-lg: 0 24px 70px rgba(7, 26, 47, .16);

  --maxw: 1180px;
  --nav-h: 72px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--c-body);
  background: var(--c-bg);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--c-ink);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.015em;
}
h1 { font-size: clamp(2.1rem, 4.2vw, 3.3rem); line-height: 1.16; letter-spacing: -.025em; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); }
h3 { font-size: 1.125rem; }
h4 { font-size: 1rem; }

p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul { margin: 0; padding: 0; list-style: none; }

/* ---------------- Layout ---------------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.section { padding: 96px 0; }
.section--soft { background: var(--c-soft); }
.section--tight { padding: 66px 0; }
.section-head { max-width: 720px; margin-bottom: 50px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 + p { margin-top: 15px; font-size: 1.02rem; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .76rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--c-brand); margin-bottom: 15px;
}
.eyebrow::before {
  content: ""; width: 22px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--c-brand), var(--c-cyan));
}
.section-head--center .eyebrow::before { display: none; }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 24px; border-radius: 999px;
  font-size: .95rem; font-weight: 600; font-family: inherit;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: .22s ease;
}
.btn svg { width: 17px; height: 17px; }
.btn--primary { background: var(--c-brand); color: #fff; box-shadow: 0 8px 20px rgba(14, 79, 209, .24); }
.btn--primary:hover { background: var(--c-brand-deep); transform: translateY(-1px); box-shadow: 0 12px 26px rgba(14, 79, 209, .3); }
.btn--ghost { border-color: rgba(255,255,255,.3); color: #fff; background: rgba(255,255,255,.07); }
.btn--ghost:hover { background: rgba(255,255,255,.15); border-color: rgba(255,255,255,.5); }
.btn--outline { border-color: var(--c-line); color: var(--c-ink); background: #fff; }
.btn--outline:hover { border-color: var(--c-brand); color: var(--c-brand); }
.btn--sm { padding: 9px 17px; font-size: .86rem; }

/* ---------------- Header ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-line-soft);
}
.nav { height: var(--nav-h); display: flex; align-items: center; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand__logo { height: 44px; width: auto; display: block; }
.brand__logo--light { height: 46px; }
.brand__mark {
  width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--c-brand) 0%, #1C6BE8 55%, var(--c-cyan) 100%);
  display: grid; place-items: center;
  box-shadow: 0 6px 14px rgba(14, 79, 209, .28);
}
.brand__mark svg { width: 20px; height: 20px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__cn { font-size: 1rem; font-weight: 700; color: var(--c-ink); letter-spacing: .02em; }
.brand__en { font-size: .62rem; letter-spacing: .18em; color: var(--c-muted); text-transform: uppercase; }

.nav__links { display: flex; align-items: center; gap: 22px; margin-left: 6px; }
.nav__links a {
  position: relative; font-size: .9rem; font-weight: 500;
  color: var(--c-body); padding: 6px 0; transition: color .2s; white-space: nowrap;
}
.nav__links a:hover { color: var(--c-brand); }
.nav__links a.is-active { color: var(--c-ink); font-weight: 600; }
.nav__links a.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -3px;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--c-brand), var(--c-cyan));
}
.nav__actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.lang-link {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 40px; height: 32px; padding: 0 12px;
  border: 1px solid var(--c-line); border-radius: 999px;
  font-size: .78rem; font-weight: 600; color: var(--c-body);
  letter-spacing: .02em; transition: .18s; white-space: nowrap;
}
.lang-link:hover { border-color: var(--c-brand); color: var(--c-brand); background: var(--c-brand-soft); }
.lang-link.is-on { background: var(--c-ink); border-color: var(--c-ink); color: #fff; }
.nav__toggle {
  display: none; width: 40px; height: 40px; border: 1px solid var(--c-line);
  border-radius: 10px; background: #fff; cursor: pointer; padding: 0;
  align-items: center; justify-content: center; color: var(--c-ink);
}
.nav__toggle svg { width: 20px; height: 20px; }

/* ---------------- Hero ---------------- */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(120% 130% at 82% 8%, #123C6B 0%, transparent 55%),
              radial-gradient(90% 100% at 10% 90%, #0B3A6E 0%, transparent 60%),
              var(--c-navy);
  color: rgba(255,255,255,.78);
  padding: 92px 0 100px;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  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: 64px 64px;
  mask-image: radial-gradient(75% 65% at 50% 40%, #000 20%, transparent 78%);
}
.hero__grid {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.02fr .98fr; gap: 56px; align-items: center;
}
.hero h1 { color: #fff; }
.hero h1 em {
  font-style: normal;
  background: linear-gradient(96deg, #62C8FF 0%, #4FE3D0 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__lead { margin-top: 22px; font-size: 1.06rem; line-height: 1.85; max-width: 520px; color: rgba(255,255,255,.75); }
.hero__actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero__meta {
  margin-top: 42px; display: flex; gap: 34px; flex-wrap: wrap;
  padding-top: 26px; border-top: 1px solid rgba(255,255,255,.12);
}
.hero__meta div strong { display: block; font-size: 1.35rem; color: #fff; font-weight: 700; letter-spacing: -.02em; }
.hero__meta div span { font-size: .8rem; color: rgba(255,255,255,.55); }

.hero__visual {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  background: linear-gradient(160deg, rgba(19,52,88,.96), rgba(8,27,47,.98));
  border: 1px solid rgba(120,180,255,.22);
  box-shadow: var(--sh-lg);
  padding: 22px;
}
.hero__visual-top {
  display: flex; align-items: center; justify-content: space-between;
  font-size: .76rem; color: rgba(255,255,255,.6); letter-spacing: .04em; margin-bottom: 14px;
}
.dot-live { display: inline-flex; align-items: center; gap: 7px; color: #6FE9D4; font-weight: 600; }
.dot-live i {
  width: 7px; height: 7px; border-radius: 50%; background: #4FE3D0;
  box-shadow: 0 0 0 4px rgba(79,227,208,.16); animation: pulse 2.2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
.hero__visual svg { width: 100%; height: auto; }
.hero__visual-legend {
  display: flex; align-items: center; gap: 10px; margin-top: 14px;
  font-size: .72rem; color: rgba(255,255,255,.55);
}
.legend-bar {
  flex: 1; height: 6px; border-radius: 4px;
  background: linear-gradient(90deg, #1B5FA8, #2FB6C8, #7CE0A8, #F2D06B, #E8734A);
}

/* ---------------- Metrics strip ---------------- */
.metrics { background: #fff; border-bottom: 1px solid var(--c-line-soft); }
.metrics__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.metric { padding: 34px 26px; border-right: 1px solid var(--c-line-soft); }
.metric:last-child { border-right: 0; }
.metric strong {
  display: block; font-size: 1.9rem; letter-spacing: -.03em; color: var(--c-ink);
  font-weight: 700; line-height: 1.2;
}
.metric strong small { font-size: .9rem; font-weight: 600; color: var(--c-brand); margin-left: 4px; letter-spacing: 0; }
.metric span { font-size: .86rem; color: var(--c-muted); }

/* ---------------- Cards ---------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.card {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--r-md); padding: 30px;
  transition: .25s ease;
}
.card:hover { border-color: #C9D8EE; box-shadow: var(--sh-md); transform: translateY(-2px); }
.card__icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--c-brand-soft); color: var(--c-brand); margin-bottom: 20px;
}
.card__icon svg { width: 23px; height: 23px; }
.card h3 { margin-bottom: 10px; }
.card p { font-size: .93rem; line-height: 1.8; }
.card__num {
  font-size: .74rem; font-weight: 700; letter-spacing: .1em;
  color: #B9C6D4; margin-bottom: 14px;
}

/* ---------------- Product ---------------- */
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.product {
  display: grid; grid-template-columns: 150px 1fr; gap: 24px; align-items: center;
  padding: 26px; border: 1px solid var(--c-line); border-radius: var(--r-md);
  background: #fff; transition: .25s ease;
}
.product:hover { border-color: #C9D8EE; box-shadow: var(--sh-md); }
.product__thumb {
  aspect-ratio: 1; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(150deg, #F2F7FF, #E8F1FD);
  border: 1px solid #E1EBF9;
}
.product__thumb svg { width: 62%; height: 62%; }
.product__tag {
  display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .06em;
  color: var(--c-brand); background: var(--c-brand-soft);
  padding: 3px 9px; border-radius: 5px; margin-bottom: 10px;
}
.product h3 { font-size: 1.05rem; margin-bottom: 8px; }
.product p { font-size: .9rem; line-height: 1.75; }
.product__specs { margin-top: 14px; display: flex; gap: 18px; flex-wrap: wrap; }
.product__specs li { font-size: .8rem; color: var(--c-muted); }
.product__specs b { color: var(--c-ink); font-weight: 600; }

/* ---------------- Scene / Solutions ---------------- */
.scene {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px;
}
.scene__card {
  position: relative; overflow: hidden; border-radius: var(--r-md);
  background: #fff; border: 1px solid var(--c-line); padding: 32px;
}
.scene__card--wide {
  grid-column: span 2; display: grid; grid-template-columns: 1fr .85fr;
  gap: 40px; align-items: center; background: linear-gradient(120deg, #0A2A4A, #0E3B66); border: 0; color: rgba(255,255,255,.72);
}
.scene__card--wide h3, .scene__card--wide h2 { color: #fff; }
.scene__card h3 { margin-bottom: 10px; }
.scene__card p { font-size: .93rem; line-height: 1.8; }
.scene__card--wide p { color: rgba(255,255,255,.72); }
.scene__list { margin-top: 20px; display: grid; gap: 10px; }
.scene__list li { display: flex; gap: 9px; font-size: .89rem; align-items: flex-start; }
.scene__list li::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0;
  margin-top: 9px; background: var(--c-cyan);
}
.scene__card--wide .scene__list li { color: rgba(255,255,255,.8); }

/* ---------------- Dark platform block ---------------- */
.platform { background: var(--c-navy); color: rgba(255,255,255,.72); overflow: hidden; }
.platform__grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 56px; align-items: center; }
.platform h2 { color: #fff; }
.platform .eyebrow { color: #6FE9D4; }
.platform .eyebrow::before { background: linear-gradient(90deg, #4FE3D0, #62C8FF); }
.platform__list { margin-top: 26px; display: grid; gap: 14px; }
.platform__list li { display: flex; gap: 12px; font-size: .93rem; }
.platform__list svg { width: 18px; height: 18px; color: #4FE3D0; flex-shrink: 0; margin-top: 4px; }
.dash-mock {
  background: #0C2138; border: 1px solid rgba(120,180,255,.18);
  border-radius: var(--r-md); padding: 18px; box-shadow: var(--sh-lg);
}
.dash-mock__bar { display: flex; gap: 6px; margin-bottom: 16px; }
.dash-mock__bar i { width: 9px; height: 9px; border-radius: 50%; background: rgba(255,255,255,.16); }
.dash-mock__kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 14px; }
.kpi-mini { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.07); border-radius: 9px; padding: 12px; }
.kpi-mini span { font-size: .68rem; color: rgba(255,255,255,.5); display: block; }
.kpi-mini b { font-size: 1.15rem; color: #fff; letter-spacing: -.02em; }
.kpi-mini b em { font-style: normal; font-size: .62rem; color: #4FE3D0; margin-left: 5px; }

/* ---------------- Cases ---------------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case {
  border: 1px solid var(--c-line); border-radius: var(--r-md); overflow: hidden; background: #fff;
  transition: .25s ease;
}
.case:hover { box-shadow: var(--sh-md); transform: translateY(-2px); }
.case__top {
  height: 132px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0C3054, #14568C);
  display: grid; place-items: center;
}
.case__top svg { width: 100%; height: 100%; }
.case__body { padding: 22px; }
.case__body h3 { font-size: 1rem; margin-bottom: 8px; }
.case__body p { font-size: .88rem; line-height: 1.75; }
.case__meta { margin-top: 14px; font-size: .78rem; color: var(--c-muted); display: flex; gap: 12px; }

/* ---------------- FAQ ---------------- */
.faq { max-width: 860px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--c-line); }
.faq__q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 24px 44px 24px 0; position: relative; font-family: inherit;
  font-size: 1rem; font-weight: 600; color: var(--c-ink); line-height: 1.6;
}
.faq__q::after {
  content: "+"; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-size: 1.35rem; font-weight: 400; color: var(--c-brand); transition: .25s;
}
.faq__item.is-open .faq__q::after { transform: translateY(-50%) rotate(45deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .32s ease; }
.faq__a p { padding: 0 44px 24px 0; font-size: .94rem; }
.faq__item.is-open .faq__a { max-height: 320px; }

/* ---------------- CTA band ---------------- */
.cta-band {
  position: relative; overflow: hidden; border-radius: var(--r-lg);
  background: linear-gradient(112deg, #0B2B4C 0%, #0E4FD1 100%);
  padding: 56px; color: rgba(255,255,255,.78);
  display: grid; grid-template-columns: 1fr auto; gap: 36px; align-items: center;
}
.cta-band h2 { color: #fff; }
.cta-band p { margin-top: 10px; font-size: .96rem; }
.cta-band__actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------------- Page head (inner) ---------------- */
.page-head {
  background: var(--c-soft); border-bottom: 1px solid var(--c-line-soft);
  padding: 56px 0 54px;
}
.crumb { font-size: .82rem; color: var(--c-muted); display: flex; gap: 8px; align-items: center; }
.crumb a:hover { color: var(--c-brand); }
.crumb span { opacity: .45; }
.page-head h1 { margin-top: 14px; font-size: clamp(1.8rem, 3.2vw, 2.5rem); }
.page-head p { margin-top: 14px; max-width: 660px; font-size: 1rem; }

/* ---------------- Forms ---------------- */
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: span 2; }
.field label { font-size: .86rem; font-weight: 600; color: var(--c-ink); }
.field label i { color: #D64545; font-style: normal; margin-left: 3px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--c-line); border-radius: 10px;
  font-family: inherit; font-size: .94rem; color: var(--c-ink); background: #fff;
  transition: .2s; outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--c-brand); box-shadow: 0 0 0 3px rgba(14,79,209,.1);
}
.field textarea { resize: vertical; min-height: 108px; line-height: 1.7; }
.field small { font-size: .76rem; color: var(--c-muted); }

.contact-panel {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 0;
  border: 1px solid var(--c-line); border-radius: var(--r-lg); overflow: hidden; background: #fff;
}
.contact-info { background: linear-gradient(160deg, #0A2A4A, #0E3E6C); color: rgba(255,255,255,.75); padding: 44px; }
.contact-info h2 { color: #fff; font-size: 1.5rem; }
.contact-info__list { margin-top: 30px; display: grid; gap: 22px; }
.contact-info__list li { display: flex; gap: 13px; font-size: .92rem; }
.contact-info__list svg { width: 18px; height: 18px; color: #6FE9D4; flex-shrink: 0; margin-top: 3px; }
.contact-info__list b { display: block; color: #fff; font-size: .84rem; font-weight: 600; margin-bottom: 2px; }
.contact-form { padding: 44px; }

/* ---------------- Footer ---------------- */
.footer { background: #061526; color: rgba(255,255,255,.55); padding: 62px 0 26px; font-size: .9rem; }
.footer__grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; }
.footer .brand__cn { color: #fff; }
.footer .brand__en { color: rgba(255,255,255,.4); }
.footer__desc { margin-top: 18px; font-size: .88rem; line-height: 1.85; max-width: 300px; }
.footer h4 { color: #fff; font-size: .88rem; margin-bottom: 16px; letter-spacing: .02em; }
.footer__links { display: grid; gap: 10px; }
.footer__links a { font-size: .87rem; transition: color .2s; }
.footer__links a:hover { color: #fff; }
.footer__bottom {
  margin-top: 48px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.08);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .8rem;
}
.footer__note { opacity: .6; }
.footer__icp { margin-left: 16px; opacity: .7; transition: opacity .2s, color .2s; }
.footer__icp:hover { opacity: 1; color: #fff; }

/* ---------------- Misc ---------------- */
.badge-proto {
  display: inline-flex; align-items: center; gap: 7px; font-size: .75rem;
  color: #8A6516; background: #FFF6E0; border: 1px solid #F5E2B0;
  padding: 4px 11px; border-radius: 999px; font-weight: 600;
}
.tag {
  display: inline-block; font-size: .76rem; font-weight: 600; color: var(--c-brand);
  background: var(--c-brand-soft); padding: 4px 11px; border-radius: 6px;
}
.article-row {
  display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center;
  padding: 26px 0; border-bottom: 1px solid var(--c-line);
}
.article-row h3 { font-size: 1.05rem; margin: 8px 0 8px; }
.article-row p { font-size: .9rem; max-width: 720px; }
.article-row:hover h3 { color: var(--c-brand); }

.quote {
  border-left: 3px solid var(--c-cyan); padding-left: 22px;
  font-size: 1.08rem; line-height: 1.85; color: var(--c-ink);
}

.table-spec { width: 100%; border-collapse: collapse; font-size: .9rem; }
.table-spec th, .table-spec td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--c-line); }
.table-spec th { width: 32%; color: var(--c-muted); font-weight: 500; background: #FAFCFF; }
.table-spec td { color: var(--c-ink); }

/* ---------------- Responsive ---------------- */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 68px 0 76px; }
  .platform__grid { grid-template-columns: 1fr; gap: 40px; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 34px; }
  .cta-band { grid-template-columns: 1fr; padding: 42px; }
  .scene__card--wide { grid-template-columns: 1fr; }
  .product { grid-template-columns: 110px 1fr; gap: 18px; }
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__toggle { display: inline-flex; }
  .nav { gap: 16px; }
  .nav__actions .btn--primary { display: none; }
  .nav.is-open .nav__links {
    display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
    position: absolute; left: 0; right: 0; top: var(--nav-h);
    background: #fff; padding: 14px 28px 22px; border-bottom: 1px solid var(--c-line);
    box-shadow: var(--sh-md);
  }
  .nav.is-open .nav__links a { width: 100%; padding: 11px 0; border-bottom: 1px solid var(--c-line-soft); }
  .metrics__grid { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(1), .metric:nth-child(2) { border-bottom: 1px solid var(--c-line-soft); }
  .grid-3, .grid-4, .case-grid { grid-template-columns: 1fr 1fr; }
  .section { padding: 68px 0; }
  .contact-panel { grid-template-columns: 1fr; }
  .scene { grid-template-columns: 1fr; }
  .scene__card--wide { grid-column: span 1; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .section { padding: 54px 0; }
  .grid-3, .grid-4, .grid-2, .case-grid, .product-grid, .form-grid { grid-template-columns: 1fr; }
  .field--full { grid-column: span 1; }
  .product { grid-template-columns: 84px 1fr; }
  .hero__meta { gap: 22px; }
  .hero__meta div strong { font-size: 1.15rem; }
  .metrics__grid { grid-template-columns: 1fr 1fr; }
  .metric { padding: 24px 18px; }
  .metric strong { font-size: 1.4rem; }
  .footer__grid { grid-template-columns: 1fr; }
  .cta-band { padding: 30px; }
  .contact-form, .contact-info { padding: 28px; }
  .article-row { grid-template-columns: 1fr; }
}

/* 进场动画：class 驱动，JS 未执行或观察器未触发时内容依然可见 */
.is-reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.is-reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .is-reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}