/* ==========================================================================
   Sontheimer 中国站 —— 工业开关工作台的视觉语言
   红 = 动作/当前，海军蓝 = 结构与正文，浅灰 = 工作面，细线 = 技术图纸
   ========================================================================== */

@font-face {
  font-family: "Inter";
  src: url("/static/fonts/inter-latin.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Merriweather Sans";
  src: url("/static/fonts/merriweather-sans-latin.woff2") format("woff2");
  font-weight: 300 800;
  font-style: normal;
  font-display: swap;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
}

::selection { background: var(--red); color: var(--white); }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--white); padding: 10px 16px;
}
.skip:focus { top: 12px; }

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

/* ── 通用排版 ───────────────────────────────────────────── */
h1, h2, h3, .display {
  font-family: var(--font-display);
  text-wrap: balance;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.18;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--red);
  line-height: 1.4;
}
.eyebrow::before {
  content: ""; width: 26px; height: 1px; background: currentColor; flex: none;
}
.eyebrow--light { color: var(--white); }

.text-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 600; color: var(--ink);
  border-bottom: 1px solid var(--ink); padding-bottom: 3px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.text-link:hover { color: var(--red); border-color: var(--red); }

.source-note {
  overflow-wrap: anywhere;
  font-size: 12px; color: var(--muted-2); line-height: 1.7; margin-top: 14px;
}
.source-note a { color: var(--muted); text-decoration: underline; text-underline-offset: 3px; }
.source-note a:hover { color: var(--red); }

.body-copy { font-size: 16px; line-height: 1.85; color: var(--muted); }
.body-copy p + p { margin-top: 1em; }
.body-copy h2 {
  color: var(--ink); font-size: clamp(20px, 2.2vw, 26px);
  margin: 2em 0 .6em;
}
.body-copy h2:first-child { margin-top: 0; }
.body-copy a { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.body-copy a:hover { color: var(--red); }

/* ── 按钮 ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 12px 22px; border: 1px solid transparent; border-radius: var(--radius);
  font-size: 14px; font-weight: 600; line-height: 1.4; cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
  white-space: nowrap;
}
.btn--primary { background: var(--red); color: var(--white); }
.btn--primary:hover { background: var(--red-dark); }
.btn--ghost { background: transparent; border-color: var(--line-2); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); background: var(--ink); color: var(--white); }
.btn--lg { padding: 15px 28px; font-size: 15px; }

.icon-btn {
  width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); border-radius: var(--radius); background: transparent;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.icon-btn svg { width: 19px; height: 19px; fill: none; stroke: var(--ink); stroke-width: 1.6; }
.icon-btn:hover { background: var(--paper-2); border-color: var(--line-2); }

/* ── 顶部条 / 页头 ──────────────────────────────────────── */
.topbar {
  background: var(--ink); color: var(--white-70);
  font-size: 12px; letter-spacing: 0.01em;
}
.topbar__inner {
  display: flex; justify-content: space-between; gap: 20px; align-items: center;
  min-height: 34px;
}
.topbar__links { display: flex; gap: 22px; flex: none; }
.topbar__links a:hover { color: var(--white); }

.header {
  position: sticky; top: 0; z-index: 50;
  background: var(--white-96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(8px);
}
.header__inner {
  display: flex; align-items: center; gap: 34px; min-height: 76px;
}
.logo { display: inline-flex; align-items: center; gap: 12px; flex: none; }
.logo img { width: 176px; height: auto; }
.logo__cn {
  font-size: 11px; letter-spacing: 0.14em; color: var(--muted);
  border-left: 1px solid var(--line-2); padding-left: 12px; line-height: 1.2;
}
.nav { display: flex; align-items: stretch; gap: 2px; margin-left: auto; }
.nav__link {
  position: relative; padding: 26px 13px 24px; font-size: 14px; font-weight: 500;
  color: var(--muted); transition: color .18s var(--ease);
}
.nav__link::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: -1px;
  height: 2px; background: var(--red); transform: scaleX(0); transform-origin: left;
  transition: transform .2s var(--ease);
}
.nav__link:hover { color: var(--ink); }
.nav__link.is-active { color: var(--ink); font-weight: 600; }
.nav__link.is-active::after { transform: scaleX(1); }
.header__actions { display: flex; align-items: center; gap: 10px; flex: none; }
.header__cta { padding: 10px 18px; }
.menu-btn { display: none; }

/* ── 首页 hero ──────────────────────────────────────────── */
.hero { padding: clamp(48px, 7vw, 92px) 0 0; border-bottom: 1px solid var(--line); }
.hero__grid {
  display: grid; grid-template-columns: 1.03fr .97fr; gap: clamp(30px, 5vw, 72px);
  align-items: center;
}
.hero h1 {
  white-space: pre-line;
  font-size: clamp(44px, 5.6vw, 78px);
  letter-spacing: -0.035em; line-height: 1.04;
  margin: 22px 0 24px;
}
.hero__lead { font-size: 17px; line-height: 1.85; color: var(--muted); max-width: 560px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 20px; }
.hero__proof { font-size: 12px; color: var(--muted-2); letter-spacing: 0.02em; }

.hero__plate {
  position: relative; aspect-ratio: 1 / 1.02;
  background:
    linear-gradient(to right, var(--ink-08) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(to bottom, var(--ink-08) 1px, transparent 1px) 0 0 / 44px 44px,
    var(--paper-2);
  border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.hero__plate::after {
  content: ""; position: absolute; inset: 18px; border: 1px solid var(--ink-08); pointer-events: none;
}
.hero__plate img {
  width: auto; max-width: 74%; max-height: 100%; height: auto; object-fit: contain;
  filter: drop-shadow(0 26px 30px var(--ink-16));
}
.hero__index {
  position: absolute; top: 22px; left: 24px; z-index: 2;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em;
  color: var(--ink); background: var(--white); padding: 4px 8px; border: 1px solid var(--line);
}
.hero__caption {
  display: flex; justify-content: space-between; margin-top: 10px;
  font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-2);
}
.hero__stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); margin-top: clamp(40px, 6vw, 76px);
}
.stat { padding: 24px 0 26px; border-right: 1px solid var(--line); padding-right: 20px; }
.stat:last-child { border-right: 0; }
.stat strong {
  display: block; font-family: var(--font-display); font-size: clamp(28px, 3vw, 38px);
  line-height: 1; letter-spacing: -0.03em;
}
.stat span { display: block; margin-top: 8px; font-size: 12px; color: var(--muted); }

/* ── 区块 ───────────────────────────────────────────────── */
.section { padding: var(--section-y) 0; }
.section--tight { padding: calc(var(--section-y) * .72) 0; }
.section--paper { background: var(--paper-2); border-block: 1px solid var(--line); }
.section__head {
  display: grid; grid-template-columns: 1.25fr .75fr; gap: 40px;
  align-items: end; margin-bottom: 44px;
}
.section__head h2 { font-size: clamp(28px, 3.4vw, 44px); margin-top: 16px; max-width: 18em; }
.section__head p { color: var(--muted); font-size: 15px; line-height: 1.85; max-width: 42em; }
.section__head--compact { margin-bottom: 28px; align-items: center; }
.section__head--compact h2 { font-size: clamp(24px, 2.6vw, 34px); margin-top: 10px; }

.subhead {
  display: flex; justify-content: space-between; align-items: end; gap: 24px;
  margin-bottom: 28px; padding-bottom: 14px; border-bottom: 1px solid var(--line);
}
.subhead h2 { font-size: clamp(22px, 2.4vw, 30px); }
.subhead > span, .subhead__note { font-size: 12px; color: var(--muted-2); }
.subhead .text-link { margin-bottom: 3px; font-size: 13px; }

/* ── 产品线入口 ─────────────────────────────────────────── */
.entry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.entry-card {
  display: flex; flex-direction: column; justify-content: space-between;
  background: var(--paper-2); border: 1px solid var(--line);
  min-height: 300px; overflow: hidden;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.entry-card:hover { border-color: var(--ink); background: var(--white); }
.entry-card--wide { grid-column: 1 / -1; flex-direction: row; min-height: 320px; }
.entry-card__text { padding: 34px 34px 28px; display: flex; flex-direction: column; flex: 1; }
.entry-card__no {
  font-family: var(--font-mono); font-size: 11px; color: var(--red); letter-spacing: 0.1em;
}
.entry-card__de {
  margin-top: 18px; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted-2);
}
.entry-card h3 { font-size: clamp(26px, 2.8vw, 38px); margin: 6px 0 10px; }
.entry-card p { color: var(--muted); font-size: 14px; line-height: 1.8; max-width: 40em; }
.entry-card__count {
  margin-top: auto;
  padding-top: 22px; font-size: 13px; font-weight: 600; color: var(--red);
  display: inline-flex; gap: 8px;
}
.entry-card__img {
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(circle at 50% 50%, var(--white-90), var(--transparent) 62%),
    var(--media-bg);
  padding: 20px;
}
.entry-card--wide .entry-card__img { width: 44%; flex: none; border-left: 1px solid var(--line); }
.entry-card__img img { width: auto; height: auto; max-width: 100%; max-height: 100%; object-fit: contain; }
.entry-card:not(.entry-card--wide) .entry-card__img { flex: none; height: 230px; }
.entry-card:not(.entry-card--wide) .entry-card__img img { max-width: 260px; }

.current-rail {
  display: flex; align-items: center; gap: 26px; flex-wrap: wrap;
  margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--line);
}
.current-rail__label { font-size: 12px; color: var(--muted-2); letter-spacing: 0.04em; }
.current-rail__chips { display: flex; flex-wrap: wrap; gap: 8px; }
.current-rail__chips a {
  display: inline-flex; align-items: baseline; gap: 8px;
  border: 1px solid var(--line); padding: 6px 11px; background: var(--white);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.current-rail__chips a:hover { border-color: var(--red); color: var(--red); }
.current-rail__chips b { font-size: 13px; }
.current-rail__chips span { font-size: 11px; color: var(--muted-2); }

/* ── 系列卡 ─────────────────────────────────────────────── */
.series-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.series-card {
  background: var(--paper); padding: 26px 24px 22px;
  display: flex; flex-direction: column; min-height: 196px;
  transition: background .18s var(--ease);
}
.series-card:hover { background: var(--paper-2); }
.series-card__tag {
  font-family: var(--font-mono); font-size: 11px; color: var(--red); letter-spacing: 0.04em;
}
.series-card h3 { font-size: 19px; margin: 12px 0 10px; }
.series-card p { font-size: 13px; color: var(--muted); line-height: 1.75; flex: 1; }
.series-card__meta {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  margin-top: 20px; padding-top: 12px; border-top: 1px solid var(--line);
  font-size: 11px; color: var(--muted-2);
}
.series-card--acc { background: var(--ink); color: var(--white); }
.series-card--acc:hover { background: var(--ink-2); }
.series-card--acc p { color: var(--white-70); }
.series-card--acc .series-card__tag { color: var(--white); }
.series-card--acc .series-card__meta { border-color: var(--white-18); color: var(--white-50); }
.series-grid--tight { grid-template-columns: repeat(3, 1fr); }

/* ── 为什么 ─────────────────────────────────────────────── */
.why__grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: clamp(40px, 6vw, 90px); }
.why__intro { position: sticky; top: 110px; align-self: start; }
.why__intro h2 { font-size: clamp(30px, 3.6vw, 46px); margin: 16px 0 18px; }
.why__intro p { color: var(--muted); max-width: 32em; }
.why__intro .text-link { margin-top: 26px; }
.feature {
  display: grid; grid-template-columns: 54px 1fr; gap: 20px;
  padding: 24px 0; border-top: 1px solid var(--line);
}
.feature:last-child { border-bottom: 1px solid var(--line); }
.feature__k { font-family: var(--font-mono); font-size: 12px; color: var(--red); padding-top: 5px; }
.feature h3 { font-size: 19px; margin-bottom: 7px; }
.feature p { font-size: 14px; color: var(--muted); line-height: 1.8; }

/* ── 数字带 ─────────────────────────────────────────────── */
.numbers { background: var(--ink); color: var(--white); padding: var(--section-y) 0; }
.numbers__head { display: block; margin-bottom: 44px; }
.numbers__head h2 { font-size: clamp(26px, 3vw, 38px); margin-top: 14px; }
.numbers__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--white-16); }
.number { background: var(--ink); padding: 26px 24px 30px; }
.number strong { font-family: var(--font-display); font-size: clamp(34px, 4vw, 54px); line-height: 1; letter-spacing: -0.03em; }
.number__unit { display: inline-block; margin-left: 6px; font-size: 12px; color: var(--white-50); }
.number p { margin-top: 12px; font-size: 12px; color: var(--white-70); line-height: 1.6; }
.numbers__source { margin-top: 22px; font-size: 11px; color: var(--white-50); }

/* ── 应用卡 ─────────────────────────────────────────────── */
.app-grid { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 1fr; gap: 18px; }
.app-card { display: flex; flex-direction: column; border: 1px solid var(--line); background: var(--white); transition: border-color .18s var(--ease); }
.app-card:hover { border-color: var(--ink); }
.app-card figure { aspect-ratio: 4 / 3; overflow: hidden; background: var(--paper-2); }
.app-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.app-card:hover img { transform: scale(1.035); }
.app-card__body { padding: 18px 18px 20px; display: flex; flex-direction: column; flex: 1; }
.app-card__k { font-family: var(--font-mono); font-size: 10px; color: var(--red); }
.app-card h2, .app-card h3 { font-size: 18px; margin: 8px 0 8px; }
.app-card p { font-size: 13px; color: var(--muted); line-height: 1.7; flex: 1; }
.app-card__more { margin-top: 14px; font-size: 12px; font-weight: 600; color: var(--ink); }
.app-card:hover .app-card__more { color: var(--red); }
.app-grid--index { grid-template-columns: repeat(4, 1fr); }

/* ── 定制 ───────────────────────────────────────────────── */
.custom__grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: clamp(34px, 5vw, 72px); align-items: center; }
.custom__media { position: relative; }
.custom__media img { width: 100%; aspect-ratio: 4 / 3.2; object-fit: cover; filter: saturate(.9); }
.custom__caption {
  position: absolute; left: 0; bottom: 0; background: var(--ink); color: var(--white);
  font-size: 12px; padding: 10px 14px; max-width: 80%;
}
.custom__copy h2 { font-size: clamp(28px, 3.4vw, 42px); margin: 16px 0 18px; }
.custom__copy > p { color: var(--muted); font-size: 15px; }
.check-list { margin: 24px 0 28px; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 26px; font-size: 14px; color: var(--ink); line-height: 1.6; }
.check-list li::before {
  content: ""; position: absolute; left: 0; top: .55em; width: 12px; height: 2px;
  background: var(--red);
}

/* ── 资料/知识入口 ──────────────────────────────────────── */
.res-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.res-card {
  border: 1px solid var(--line); background: var(--white); padding: 36px;
  display: flex; flex-direction: column; align-items: flex-start; min-height: 300px;
  transition: border-color .18s var(--ease);
}
.res-card:hover { border-color: var(--ink); }
.res-card h2 { font-size: clamp(24px, 2.6vw, 32px); margin: 16px 0 14px; max-width: 15em; }
.res-card p { color: var(--muted); font-size: 14px; flex: 1; max-width: 34em; }
.res-card .text-link { margin-top: 28px; }
.res-card--dark { background: var(--ink); border-color: var(--ink); color: var(--white); }
.res-card--dark p { color: var(--white-70); }
.res-card--dark .text-link { color: var(--white); border-color: var(--white-50); }
.res-card--dark .text-link:hover { color: var(--white); border-color: var(--white); }

/* ── CTA 带 ─────────────────────────────────────────────── */
.cta-band { background: var(--ink); color: var(--white); padding: clamp(48px, 6vw, 76px) 0; }
.cta-band__inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.cta-band h2 { font-size: clamp(30px, 3.8vw, 48px); margin-top: 14px; line-height: 1.15; }
.cta-band__side p { color: var(--white-70); font-size: 15px; max-width: 40em; }
.cta-band__actions { display: flex; align-items: center; gap: 24px; margin-top: 24px; flex-wrap: wrap; }
.cta-band__phone { font-family: var(--font-display); font-size: 22px; letter-spacing: .01em; }
.cta-band__phone:hover { color: var(--red-soft); }

/* ── 页头通用 ───────────────────────────────────────────── */
.page-head { padding: clamp(34px, 5vw, 62px) 0 clamp(38px, 5vw, 64px); background: var(--paper-2); border-bottom: 1px solid var(--line); }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 11px; color: var(--muted-2); margin-bottom: 28px; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--red); }
.crumbs span { color: var(--line-strong); }
.page-head h1 { font-size: clamp(36px, 4.6vw, 60px); margin: 14px 0 18px; letter-spacing: -0.03em; white-space: pre-line; }
.page-head__grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: clamp(30px, 5vw, 70px); align-items: end; }
.page-head__lead { font-size: 17px; line-height: 1.85; color: var(--muted); max-width: 46em; }
.page-head__body { font-size: 14px; color: var(--muted); line-height: 1.85; margin-top: 16px; }
.page-head__facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; border-top: 1px solid var(--line-2); padding-top: 18px; }
.page-head__facts dt { font-size: 11px; color: var(--muted-2); letter-spacing: .04em; }
.page-head__facts dd { font-family: var(--font-display); font-size: 30px; line-height: 1.1; margin-top: 4px; }
.page-head__media { background: var(--media-bg); border: 1px solid var(--line); padding: 26px; display: flex; align-items: center; justify-content: center; }
.page-head__media img { width: 100%; max-width: 320px; height: auto; object-fit: contain; }

/* ── 产品分类卡 ─────────────────────────────────────────── */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.cat-card {
  position: relative; border: 1px solid var(--line); background: var(--white); padding: 30px;
  min-height: 250px; display: flex; flex-direction: column; transition: border-color .18s var(--ease), background .18s var(--ease);
}
.cat-card:hover { border-color: var(--ink); background: var(--paper-2); }
.cat-card__de { font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--red); }
.cat-card h2 { font-size: clamp(24px, 2.4vw, 30px); margin: 14px 0 10px; }
.cat-card p { font-size: 13px; color: var(--muted); line-height: 1.75; }
.cat-card__meta { margin-top: auto; padding-top: 22px; font-size: 11px; color: var(--muted-2); }
.cat-card__arrow { position: absolute; right: 28px; top: 28px; font-size: 18px; color: var(--muted-2); transition: transform .2s var(--ease), color .2s var(--ease); }
.cat-card:hover .cat-card__arrow { color: var(--red); transform: translateX(4px); }

/* ── 筛选与产品网格 ─────────────────────────────────────── */
.filterbar {
  display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 12px; align-items: end;
  border: 1px solid var(--line); background: var(--white); padding: 18px; margin-bottom: 18px;
}
.filterbar--cat { grid-template-columns: 2fr 1fr auto; }
.filterbar--series { grid-template-columns: 2fr auto; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field > span { font-size: 11px; color: var(--muted-2); letter-spacing: .04em; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid var(--line-2); border-radius: var(--radius);
  background: var(--white); padding: 11px 12px; font-size: 14px; min-height: 44px;
  transition: border-color .18s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--ink); outline: none; }
.field textarea { min-height: 150px; resize: vertical; line-height: 1.7; }
.filterbar__reset { min-height: 44px; }
.resultbar {
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  font-size: 12px; color: var(--ink); margin: 8px 0 22px; padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.resultbar__hint { color: var(--muted-2); }

.pgrid { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 1fr; gap: 14px; }
.pcard { border: 1px solid var(--line); background: var(--white); transition: border-color .18s var(--ease); }
.pcard:hover { border-color: var(--ink); }
.pcard__link { display: flex; flex-direction: column; height: 100%; }
.pcard__fig {
  position: relative; aspect-ratio: 4 / 3; background: var(--media-bg);
  display: flex; align-items: center; justify-content: center; padding: 16px;
  border-bottom: 1px solid var(--line); overflow: hidden;
}
.pcard__fig img { width: 100%; height: 100%; object-fit: contain; transition: transform .35s var(--ease); }
.pcard:hover .pcard__fig img { transform: scale(1.03); }
.pcard__art {
  position: absolute; top: 8px; right: 8px; font-family: var(--font-mono);
  font-size: 10px; color: var(--muted); background: var(--white); border: 1px solid var(--line);
  padding: 2px 5px;
}
.pcard__body { padding: 14px 15px 16px; display: flex; flex-direction: column; flex: 1; }
.pcard__series { font-family: var(--font-mono); font-size: 10px; color: var(--red); letter-spacing: .05em; }
.pcard__name { font-size: 14px; line-height: 1.45; margin: 6px 0 6px; font-family: var(--font-body); font-weight: 600; letter-spacing: 0; }
.pcard__tag { font-size: 11px; color: var(--muted); line-height: 1.6; flex: 1; }
.pcard__more { margin-top: 12px; font-size: 11px; color: var(--muted-2); }
.pcard:hover .pcard__more { color: var(--red); }
.pgrid--related { grid-template-columns: repeat(4, 1fr); }

.empty { border: 1px dashed var(--line-2); padding: 48px; text-align: center; margin-top: 24px; }
.empty h3 { font-size: 22px; margin-bottom: 8px; }
.empty p { color: var(--muted); font-size: 14px; }
.empty a { text-decoration: underline; text-underline-offset: 3px; }
.load-more-wrap { text-align: center; margin-top: 30px; }
.is-hidden { display: none !important; }

/* ── 系列页概览 ─────────────────────────────────────────── */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.chip {
  display: inline-flex; align-items: center; border: 1px solid var(--line-2);
  background: var(--white); padding: 5px 10px; font-size: 12px; color: var(--ink);
}
.chips--links .chip:hover { border-color: var(--red); color: var(--red); }
.page-head__actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.spec-overview { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(30px, 5vw, 70px); }
.spec-overview__main h2 { font-size: clamp(26px, 3vw, 36px); margin: 14px 0 22px; }
.spec-overview__table { border-top: 1px solid var(--line); }
.spec-overview__table > div { display: grid; grid-template-columns: 150px 1fr; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.spec-overview__table dt { font-size: 12px; color: var(--muted-2); }
.spec-overview__table dd { font-size: 13px; color: var(--ink); }
.spec-overview__table dd a { text-decoration: underline; text-underline-offset: 3px; }

/* ── 产品详情 ───────────────────────────────────────────── */
.product { padding: clamp(28px, 4vw, 48px) 0 var(--section-y); }
.product__grid { display: grid; grid-template-columns: 1.02fr .98fr; gap: clamp(30px, 5vw, 64px); align-items: start; }
.product__media { background: var(--media-bg); border: 1px solid var(--line); padding: clamp(24px, 4vw, 48px); }
.product__media img { display: block; width: auto; max-width: 100%; height: auto; max-height: 560px; margin: 0 auto; object-fit: contain; }
.product__media figcaption { display: flex; justify-content: space-between; gap: 16px; margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 11px; color: var(--muted-2); }
.product__buy h1 { word-break: keep-all; font-size: clamp(30px, 3.4vw, 44px); margin: 14px 0 12px; letter-spacing: -0.03em; }
.product__tag { font-size: 15px; color: var(--muted); line-height: 1.7; }
.product__art { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 18px 0 22px; font-size: 12px; color: var(--muted-2); }
.product__art b { color: var(--ink); font-family: var(--font-mono); font-weight: 500; }
.key-specs { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); margin-bottom: 26px; }
.key-specs > div { padding: 12px 0; border-bottom: 1px solid var(--line); }
.key-specs > div:nth-child(odd) { padding-right: 16px; }
.key-specs dt { font-size: 11px; color: var(--muted-2); }
.key-specs dd { font-size: 14px; margin-top: 2px; }
.product__actions { display: flex; flex-wrap: wrap; gap: 10px; }
.product__note { margin-top: 18px; font-size: 12px; color: var(--muted-2); line-height: 1.7; }
.product__desc-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: clamp(30px, 5vw, 70px); }
.product__desc h2 { font-size: clamp(26px, 3vw, 36px); margin: 14px 0 20px; }
.product__points { border-left: 1px solid var(--line); padding-left: 32px; }
.product__points h3 { font-size: 15px; margin-bottom: 18px; }
.product__points .check-list { margin-bottom: 22px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--white); }
.spec-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.spec-table caption { text-align: left; font-size: 11px; color: var(--muted-2); padding: 12px 16px; border-bottom: 1px solid var(--line); }
.spec-table th, .spec-table td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--line); font-size: 13px; vertical-align: top; }
.spec-table thead th { font-size: 11px; letter-spacing: .05em; color: var(--muted-2); background: var(--paper-2); font-weight: 500; }
.spec-table tbody th { font-weight: 500; color: var(--muted); width: 24%; }
.spec-table tbody td:last-child { font-family: var(--font-mono); font-size: 12px; color: var(--muted-2); }
.spec-table tr.is-missing td { color: var(--muted-2); }
.data-note { margin-top: 24px; border-left: 2px solid var(--red); padding: 4px 0 4px 22px; max-width: 70em; }
.data-note h3 { font-size: 14px; margin-bottom: 8px; }
.data-note p { font-size: 13px; color: var(--muted); line-height: 1.8; }
.data-note a { text-decoration: underline; text-underline-offset: 3px; }

/* ── 应用详情 ───────────────────────────────────────────── */
.app-hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(30px, 5vw, 64px); align-items: center; margin-top: 6px; }
.app-hero__media { aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--line); }
.app-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.app-hero__copy h1 { font-size: clamp(34px, 4.4vw, 56px); margin: 14px 0 16px; }
.app-body { display: grid; grid-template-columns: 1.35fr .65fr; gap: clamp(30px, 5vw, 70px); }
.app-body .body-copy p { font-size: 16px; }
.callout { margin-top: 26px; background: var(--paper-2); border-left: 2px solid var(--red); padding: 18px 20px; font-size: 14px; color: var(--ink); line-height: 1.75; }
.app-aside { border-top: 2px solid var(--ink); padding-top: 20px; }
.app-aside h2 { font-size: 16px; margin-bottom: 14px; }
.app-aside .btn { margin-top: 22px; width: 100%; }
.link-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.link-list li { background: var(--white); }
.link-list a { display: flex; flex-direction: column; gap: 3px; padding: 12px 14px; }
.link-list a:hover { background: var(--paper-2); }
.link-list b { font-size: 14px; color: var(--ink); }
.link-list span { font-size: 11px; color: var(--muted-2); line-height: 1.5; }
.link-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.link-card { border: 1px solid var(--line); background: var(--white); padding: 24px; transition: border-color .18s var(--ease); }
.link-card:hover { border-color: var(--ink); }
.link-card h3 { font-size: 19px; margin: 10px 0 8px; }
.link-card p { font-size: 13px; color: var(--muted); line-height: 1.7; }
.split-note { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(30px, 5vw, 70px); }
.split-note h2 { font-size: clamp(26px, 3vw, 36px); margin-top: 14px; }
.split-note p { font-size: 15px; color: var(--muted); line-height: 1.85; }
.split-note p + p { margin-top: 1em; }

/* ── 选型器 ─────────────────────────────────────────────── */
.steps { display: grid; gap: 12px; border-top: 1px solid var(--line-2); padding-top: 18px; }
.steps li { display: grid; grid-template-columns: 34px 1fr; gap: 10px; font-size: 13px; color: var(--muted); line-height: 1.65; }
.steps b { font-family: var(--font-mono); color: var(--red); font-weight: 500; font-size: 11px; padding-top: 4px; }
.selector { border: 1px solid var(--line); background: var(--white); padding: 22px; }
.selector__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.selector__actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }
.selector__count { margin-left: auto; font-size: 12px; color: var(--muted-2); }
.selector__results-head { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; margin: 40px 0 18px; }
.selector__results-head h2 { font-size: 24px; }
.selector__results-head p { font-size: 12px; color: var(--muted-2); }
.sel-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.sel-card { display: grid; grid-template-columns: 92px 1fr; border: 1px solid var(--line); background: var(--white); min-height: 118px; transition: border-color .18s var(--ease); }
.sel-card:hover { border-color: var(--ink); }
.sel-card figure { background: var(--media-bg); display: flex; align-items: center; justify-content: center; padding: 8px; border-right: 1px solid var(--line); }
.sel-card img { width: 100%; height: 100%; max-height: 100px; object-fit: contain; }
.sel-card div { padding: 12px 14px; }
.sel-card span { font-family: var(--font-mono); font-size: 10px; color: var(--red); }
.sel-card h3 { font-size: 13px; font-family: var(--font-body); font-weight: 600; margin: 3px 0 4px; line-height: 1.4; }
.sel-card p { font-size: 10.5px; color: var(--muted); line-height: 1.5; }
.sel-card em { display: block; margin-top: 6px; font-style: normal; font-family: var(--font-mono); font-size: 10px; color: var(--muted-2); }

/* ── 资料下载 ───────────────────────────────────────────── */
.dl-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.dl-item { display: grid; grid-template-columns: 54px 1fr auto; gap: 20px; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--line); }
.dl-item__icon { width: 44px; height: 54px; border: 1px solid var(--line-2); display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: 9px; color: var(--red); background: var(--white); }
.dl-item__body h3 { font-size: 16px; font-family: var(--font-body); font-weight: 600; }
.dl-item__body p { font-size: 12px; color: var(--muted); margin: 3px 0 5px; }
.dl-item__meta { font-family: var(--font-mono); font-size: 10px; color: var(--muted-2); }
.dl-item__actions { display: flex; align-items: center; gap: 14px; }
.dl-item__src { font-size: 11px; color: var(--muted-2); text-decoration: underline; text-underline-offset: 3px; }
.dl-item__src:hover { color: var(--red); }

/* ── 知识 ───────────────────────────────────────────────── */
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.article-card { border: 1px solid var(--line); background: var(--white); padding: 26px; display: flex; flex-direction: column; min-height: 260px; transition: border-color .18s var(--ease); }
.article-card:hover { border-color: var(--ink); }
.article-card__tag { font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--red); }
.article-card h2, .article-card h3 { font-size: 20px; margin: 12px 0 10px; line-height: 1.35; }
.article-card p { font-size: 13px; color: var(--muted); line-height: 1.75; flex: 1; }
.article-card__meta { margin-top: 20px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 11px; color: var(--muted-2); }
.article-grid--small { grid-template-columns: repeat(4, 1fr); }
.faq { display: grid; grid-template-columns: .55fr 1.45fr; gap: clamp(30px, 5vw, 70px); }
.faq__head h2 { font-size: 32px; margin: 14px 0 10px; }
.faq__head p { font-size: 14px; color: var(--muted); }
.faq__item { border-top: 1px solid var(--line); }
.faq__item:last-child { border-bottom: 1px solid var(--line); }
.faq__item summary { cursor: pointer; padding: 18px 0; font-size: 15px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 20px; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; color: var(--red); font-size: 18px; line-height: 1; }
.faq__item[open] summary::after { content: "–"; }
.faq__item p { padding: 0 0 20px; font-size: 14px; color: var(--muted); line-height: 1.85; max-width: 58em; }

.article-head { max-width: 60em; }
.article-head h1 { font-size: clamp(32px, 4vw, 52px); margin: 14px 0 18px; }
.article-head__meta { display: block; margin-top: 18px; font-size: 12px; color: var(--muted-2); }
.article-body { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr); gap: clamp(30px, 5vw, 70px); align-items: start; }
.article-body .body-copy { max-width: 46em; }
.article-body .body-copy h2 { border-top: 1px solid var(--line); padding-top: 18px; }
.article-aside { border-top: 2px solid var(--ink); padding-top: 20px; position: sticky; top: 110px; }
.article-aside h2 { font-size: 14px; margin-bottom: 12px; }
.article-aside .btn { width: 100%; margin-top: 20px; }
.source-list { display: grid; gap: 12px; margin-top: 14px; }
.source-list li { border-top: 1px solid var(--line); padding-top: 12px; }
.source-list a { font-size: 13px; font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
.source-list span { display: block; font-family: var(--font-mono); font-size: 10px; color: var(--muted-2); margin-top: 3px; word-break: break-all; }

/* ── 关于 ───────────────────────────────────────────────── */
.about-hero { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(30px, 5vw, 64px); align-items: center; }
.about-hero h1 { font-size: clamp(42px, 5.2vw, 70px); margin: 16px 0 20px; letter-spacing: -0.035em; }
.about-hero__media { aspect-ratio: 4 / 3.4; overflow: hidden; border: 1px solid var(--line); }
.about-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.about-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 34px; border-top: 1px solid var(--line-2); padding-top: 18px; }
.about-stats strong { display: block; font-family: var(--font-display); font-size: 26px; line-height: 1; }
.about-stats span { display: block; font-size: 11px; color: var(--muted-2); margin-top: 5px; }
.about-body > *, .article-body > *, .product__desc-grid > *, .contact-grid > *, .app-body > *, .legal-body > *, .split-note > * { min-width: 0; }
.about-body { display: grid; grid-template-columns: 1.4fr .6fr; gap: clamp(30px, 5vw, 70px); align-items: start; }
.about-aside { border-top: 2px solid var(--ink); padding-top: 20px; }
.about-aside h2 { font-size: 13px; margin: 22px 0 12px; color: var(--muted-2); letter-spacing: .04em; }
.about-aside h2:first-child { margin-top: 0; }
.facts { display: grid; gap: 10px; }
.facts > div { display: grid; grid-template-columns: 58px 1fr; gap: 10px; font-size: 12px; }
.facts dt { color: var(--muted-2); }
.facts dd { color: var(--ink); }
.facts a { text-decoration: underline; text-underline-offset: 3px; }
.value-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.value { background: var(--white); padding: 24px 20px; }
.value > span { font-family: var(--font-mono); font-size: 11px; color: var(--red); }
.value h3 { font-size: 17px; margin: 12px 0 8px; }
.value p { font-size: 12px; color: var(--muted); line-height: 1.7; }
.gallery { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 14px; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; height: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.gallery figure:first-child img { aspect-ratio: 4 / 3.4; }
.gallery figcaption { font-size: 11px; color: var(--muted-2); margin-top: 7px; }

/* ── 联系 ───────────────────────────────────────────────── */
.contact-quick { display: grid; gap: 12px; border-top: 1px solid var(--line-2); padding-top: 16px; }
.contact-quick > a, .contact-quick > div { display: grid; grid-template-columns: 74px 1fr; gap: 12px; font-size: 13px; }
.contact-quick span { color: var(--muted-2); font-size: 12px; padding-top: 3px; }
.contact-quick b { font-weight: 500; color: var(--ink); font-size: 13.5px; }
.contact-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: clamp(30px, 5vw, 70px); align-items: start; }
.contact-form-wrap h2 { font-size: clamp(26px, 3vw, 34px); }
.contact-form__lead { color: var(--muted); font-size: 14px; margin: 10px 0 26px; }
.enquiry { display: grid; gap: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 12px; color: var(--muted); line-height: 1.65; }
.consent input { margin-top: 3px; flex: none; width: 16px; height: 16px; accent-color: var(--red); }
.honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form-status { font-size: 13px; color: var(--muted); }
.form-status.is-ok { color: var(--success); }
.form-status.is-error { color: var(--red); }
.form-note { font-size: 11px; color: var(--muted-2); }
.form-note a { text-decoration: underline; text-underline-offset: 3px; }
.contact-side { border-top: 2px solid var(--ink); padding-top: 20px; }
.contact-side__photo { margin-bottom: 24px; }
.contact-side__photo img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: 50% 20%; }
.contact-side h2 { font-size: 12px; letter-spacing: .06em; color: var(--muted-2); margin: 22px 0 8px; }
.contact-side h2:first-of-type { margin-top: 0; }
.contact-side p { font-size: 13px; color: var(--muted); line-height: 1.75; }
.contact-side p + p { margin-top: 6px; }
.contact-side b { color: var(--ink); }
.contact-side a { text-decoration: underline; text-underline-offset: 3px; }

/* ── 搜索 ───────────────────────────────────────────────── */
.search-head { max-width: 60em; }
.search-head h1 { font-size: clamp(38px, 4.6vw, 58px); margin: 14px 0 20px; }
.search-form { display: flex; gap: 10px; margin-top: 22px; max-width: 720px; }
.search-form input { flex: 1; min-height: 52px; padding: 12px 16px; border: 1px solid var(--line-2); background: var(--white); font-size: 15px; }
.search-form input:focus { border-color: var(--ink); outline: none; }
.search-hint { margin-top: 12px; font-size: 12px; color: var(--muted-2); }
.search-results { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.search-results:empty { display: none; }
.sr-item { background: var(--white); padding: 16px 18px; display: grid; grid-template-columns: 110px 1fr; gap: 18px; }
.sr-item:hover { background: var(--paper-2); }
.sr-item__type { font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--red); padding-top: 3px; }
.sr-item h3 { font-size: 16px; font-family: var(--font-body); font-weight: 600; }
.sr-item p { font-size: 12px; color: var(--muted); margin-top: 3px; line-height: 1.6; }
.sr-item code { font-family: var(--font-mono); font-size: 10px; color: var(--muted-2); margin-top: 4px; display: block; }
.search-default { margin-top: 56px; }
.search-default h2 { font-size: 20px; margin: 28px 0 16px; }
.search-default h2:first-child { margin-top: 0; }

/* ── 法务 / 404 ─────────────────────────────────────────── */
.page-head--legal h1 { font-size: clamp(34px, 4vw, 50px); }
.legal-body { display: grid; grid-template-columns: 1.4fr .6fr; gap: clamp(30px, 5vw, 70px); align-items: start; }
.legal-body .body-copy { max-width: 52em; }
.legal-aside { border-top: 2px solid var(--ink); padding-top: 18px; }
.legal-aside h2 { font-size: 13px; color: var(--muted-2); margin-bottom: 10px; }
.legal-aside p { font-size: 13px; color: var(--muted); }
.legal-aside a { text-decoration: underline; text-underline-offset: 3px; }
.page-head--404 { padding: clamp(64px, 10vw, 140px) 0; }
.page-head--404 h1 { font-size: clamp(40px, 6vw, 76px); }
.link-cards--404 { margin-top: 46px; max-width: 900px; }

/* ── 页脚 ───────────────────────────────────────────────── */
.footer { background: var(--ink); color: var(--white); padding: 64px 0 24px; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; }
.footer__brand img { filter: invert(1); width: 176px; height: auto; margin-bottom: 20px; }
.footer__brand p { font-size: 13px; color: var(--white-70); line-height: 1.8; max-width: 34em; }
.footer__operator { margin-top: 10px; font-size: 11px !important; color: var(--white-50) !important; }
.footer__col h4 { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--white-50); margin: 0 0 16px; font-weight: 500; }
.footer__col a, .footer__col span { display: block; font-size: 13px; color: var(--white-70); padding: 4px 0; }
.footer__col a:hover { color: var(--white); }
.footer__bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px;
  margin-top: 54px; padding-top: 20px; border-top: 1px solid var(--white-16);
  font-size: 10.5px; color: var(--white-50);
}
.footer__legal { display: flex; gap: 18px; }
.footer__legal a:hover { color: var(--white); }

/* ── 响应式 ─────────────────────────────────────────────── */
@media (max-width: 1180px) {
  .nav__link { padding-inline: 9px; font-size: 13px; }
  .header__inner { gap: 20px; }
  .pgrid { grid-template-columns: repeat(3, 1fr); }
  .app-grid, .app-grid--index { grid-template-columns: repeat(3, 1fr); }
  .series-grid { grid-template-columns: repeat(3, 1fr); }
  .value-grid { grid-template-columns: repeat(3, 1fr); }
  .article-grid--small { grid-template-columns: repeat(2, 1fr); }
  .sel-grid { grid-template-columns: repeat(2, 1fr); }
  .selector__grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
  .header__cta { display: none; }
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { max-width: 640px; width: 100%; }
  .hero__plate { aspect-ratio: 16 / 11; }
  .hero__plate img { width: auto; max-width: 58%; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(3), .stat:nth-child(4) { border-top: 1px solid var(--line); }
  .entry-card--wide { flex-direction: column; }
  .entry-card--wide .entry-card__img { width: 100%; border-left: 0; border-top: 1px solid var(--line); }
  .why__grid, .faq, .contact-grid, .about-body, .legal-body, .article-body, .app-body, .product__desc-grid, .split-note { grid-template-columns: 1fr; }
  .why__intro, .article-aside { position: static; }
  .product__points { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 22px; }
  .numbers__grid { grid-template-columns: repeat(2, 1fr); }
  .page-head__grid { grid-template-columns: 1fr; }
  .page-head__facts { max-width: 560px; }
  .product__grid { grid-template-columns: 1fr; }
  .product__media { max-width: 680px; }
  .spec-overview { grid-template-columns: 1fr; }
  .app-hero { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-side { max-width: 640px; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .menu-btn {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 40px; height: 40px; border: 1px solid var(--line); background: transparent; cursor: pointer;
  }
  .menu-btn span { display: block; width: 18px; height: 1.5px; background: var(--ink); margin-inline: auto; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: var(--white); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 8px var(--gutter) 18px; gap: 0;
  }
  .nav.is-open { display: flex; }
  .nav__link { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
  .nav__link::after { display: none; }
  .logo img { width: 150px; }
  .header__inner { min-height: 66px; }
  .hero h1 { font-size: clamp(40px, 9vw, 60px); }
  .entry-grid, .cat-grid, .res-grid, .link-cards { grid-template-columns: 1fr; }
  .entry-card--wide .entry-card__img { height: 230px; }
  .pgrid, .pgrid--related { grid-template-columns: repeat(2, 1fr); }
  .app-grid, .app-grid--index { grid-template-columns: repeat(2, 1fr); }
  .series-grid, .series-grid--tight { grid-template-columns: repeat(2, 1fr); }
  .section__head { grid-template-columns: 1fr; gap: 16px; }
  .numbers__head { flex-direction: column; align-items: flex-start; }
  .custom__grid, .about-hero { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .article-grid, .article-grid--small { grid-template-columns: 1fr 1fr; }
  .selector__grid { grid-template-columns: repeat(2, 1fr); }
  .sel-grid { grid-template-columns: 1fr; }
  .filterbar, .filterbar--cat, .filterbar--series { grid-template-columns: 1fr 1fr; }
  .filterbar .field--search { grid-column: 1 / -1; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .cta-band__inner { grid-template-columns: 1fr; gap: 26px; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .dl-item { grid-template-columns: 44px 1fr; }
  .dl-item__actions { grid-column: 2; justify-content: flex-start; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .topbar__note { display: none; }
  .topbar__inner { justify-content: center; }
  .hero { padding-top: 36px; }
  .hero h1 { font-size: clamp(36px, 11vw, 48px); }
  .hero__lead { font-size: 15.5px; }
  .hero__stats { grid-template-columns: 1fr 1fr; }
  .stat { padding-right: 14px; }
  .logo__cn { display: none; }
  .pgrid, .pgrid--related { grid-template-columns: 1fr 1fr; gap: 8px; }
  .pcard__body { padding: 10px 11px 12px; }
  .pcard__name { font-size: 12.5px; }
  .pcard__tag { font-size: 10px; }
  .pcard__fig { padding: 10px; }
  .app-grid, .app-grid--index { grid-template-columns: 1fr; }
  .series-grid, .series-grid--tight { grid-template-columns: 1fr; }
  .article-grid, .article-grid--small { grid-template-columns: 1fr; }
  .filterbar, .filterbar--cat, .filterbar--series { grid-template-columns: 1fr; }
  .selector__grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__contact { grid-column: auto; }
  .footer__bottom { flex-direction: column; }
  .gallery { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .chips { gap: 6px; }
  .page-head__actions .btn, .hero__actions .btn { width: 100%; }
  .cta-band__actions { flex-direction: column; align-items: flex-start; }
  .product__actions .btn { width: 100%; }
  .search-form { flex-direction: column; }
  .search-form .btn { width: 100%; }
  .sr-item { grid-template-columns: 1fr; gap: 4px; }
  .bottom { padding-bottom: 24px; }
  .dl-item__actions { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

/* CJK 排版：标题避免单字成行，正文避免孤行 */
h1, h2, h3, h4 { text-wrap: balance; }
p { text-wrap: pretty; }