/* ============================================================
   群英机械 · 视觉系统
   方向：焦作的重型机械车间 —— 铸铁、钢板、图纸与出厂铭牌
   ============================================================ */

:root {
  /* 铸铁与钢板 */
  --iron: #14181b;
  --iron-2: #1b2126;
  --steel: #232c34;
  --steel-2: #2e3941;

  /* 图纸纸面 */
  --paper: #e6e5e0;
  --paper-2: #dedcd6;
  --paper-3: #f2f1ed;

  /* 字色 */
  --ink: #1a1f23;
  --ink-soft: #4a545b;
  --ash: #7c868d;
  --mist: #c6cfd5;

  /* 炉火橙：全站唯一强调色 */
  --flame: #c04c1b;
  --flame-deep: #a33d13;

  --line-dark: rgba(198, 209, 216, 0.16);
  --line-light: rgba(26, 31, 35, 0.14);

  --wrap: 1240px;
  --gut: clamp(18px, 4vw, 56px);

  --f-display: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --f-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --f-mono: "JetBrains Mono", "Cascadia Mono", "Consolas", monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 900;
  letter-spacing: 0.01em;
  line-height: 1.18;
  margin: 0;
  text-wrap: pretty;
}

p { margin: 0; text-wrap: pretty; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

/* ================= 顶栏与头部 ================= */

.topbar {
  background: var(--iron);
  color: var(--mist);
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--line-dark);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 40px;
  padding-top: 6px;
  padding-bottom: 6px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.topbar a { display: inline-flex; align-items: center; gap: 7px; }
.topbar a:hover { color: #fff; }

.topbar .ico { width: 13px; height: 13px; stroke: currentColor; fill: none; stroke-width: 1.6; }

#lang-btn {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--iron);
  background: var(--mist);
  border: 0;
  padding: 5px 12px;
  cursor: pointer;
  min-height: 28px;
}

#lang-btn:hover { background: #fff; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(20, 24, 27, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-dark);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-stuck { background: rgba(20, 24, 27, 0.99); box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  min-height: 78px;
}

.brand-lockup { display: flex; align-items: center; gap: 12px; color: #fff; }

.emblem {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--flame);
  color: #fff;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.02em;
  position: relative;
}

.emblem::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(255, 255, 255, 0.42);
}

.brand-text { display: grid; gap: 2px; }

.brand-name {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: 0.06em;
  line-height: 1.1;
  color: #fff;
}

.brand-sub {
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ash);
}

#nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

#nav-links a {
  position: relative;
  padding: 10px 13px;
  color: var(--mist);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.03em;
  white-space: nowrap;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

#nav-links a:hover { color: #fff; }

#nav-links a.is-on { color: #fff; }

#nav-links a.is-on::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 2px;
  height: 2px;
  background: var(--flame);
}

.header-tel {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line-dark);
  padding: 9px 14px;
  color: #fff;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.header-tel:hover { border-color: var(--flame); }
.header-tel .ico { width: 14px; height: 14px; stroke: var(--flame); fill: none; stroke-width: 1.6; }

#menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-dark);
  background: transparent;
  cursor: pointer;
  padding: 0;
  place-items: center;
}

#menu-btn span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: #fff;
  position: relative;
}

#menu-btn span::before, #menu-btn span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1.5px;
  background: #fff;
}

#menu-btn span::before { top: -6px; }
#menu-btn span::after { top: 6px; }

/* ================= 按钮 ================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 22px;
  min-height: 48px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease;
  font-family: var(--f-body);
}

.btn .ico,
.btn svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.7; }

.btn-solid { background: var(--flame); color: #fff; }
.btn-solid:hover { background: var(--flame-deep); }

.btn-ghost { border-color: rgba(255, 255, 255, 0.34); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, 0.06); }

.btn-line { border-color: var(--line-light); color: var(--ink); }
.btn-line:hover { border-color: var(--ink); }

.btn-full { width: 100%; }

.sec-foot { margin-top: 38px; }

/* ================= 首页主视觉 ================= */

.hero {
  position: relative;
  background: var(--paper-3);
  color: var(--ink);
  overflow: hidden;
  border-bottom: 1px solid var(--line-light);
}

/* 图纸网格：极浅的方网格，给浅色底一点工业底纹 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(26, 31, 35, 0.042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 31, 35, 0.042) 1px, transparent 1px);
  background-size: 68px 68px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 72px) var(--gut) clamp(34px, 4vw, 58px);
  display: grid;
  grid-template-columns: 1.04fr 0.96fr;
  gap: clamp(26px, 4vw, 58px);
  align-items: center;
}

.hero-text { max-width: 40ch; }

.hero-media { position: relative; }

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3.2;
  object-fit: cover;
  object-position: center 46%;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(26, 31, 35, 0.2);
  pointer-events: none;
}

.hero-plate {
  position: absolute !important;
  left: 0;
  bottom: 0;
  max-width: 78%;
  padding: 13px 17px;
  gap: 7px;
  z-index: 2;
}

.hero-plate .plate-v { font-size: 11px; }
.hero-plate .plate-k { font-size: 8.5px; }

.hero-kicker {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--flame);
  border-left: 2px solid var(--flame);
  padding-left: 12px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(34px, 4.2vw, 60px);
  letter-spacing: 0.015em;
  max-width: 14ch;
  margin-bottom: 22px;
  color: var(--ink);
}

.hero-lead {
  max-width: 46ch;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.1vw, 16.5px);
  line-height: 1.85;
}

.hero-cta { display: flex; gap: 12px; margin-top: 30px; flex-wrap: wrap; }

.hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-light);
  background: rgba(255, 255, 255, 0.66);
  width: 100%;
}

.stat {
  padding: 20px var(--gut);
  display: grid;
  gap: 4px;
  border-right: 1px solid var(--line-light);
}

.stat:last-child { border-right: 0; }

.stat-v { font-family: var(--f-mono); font-size: clamp(18px, 1.8vw, 24px); font-weight: 500; color: var(--ink); letter-spacing: -0.01em; }
.stat-l { font-size: 12px; color: var(--ash); letter-spacing: 0.04em; }

/* ================= 区块 ================= */

.sec { padding: clamp(56px, 7vw, 104px) var(--gut); }
.sec-tight { padding-top: 10px; }

.sec-head { max-width: 720px; margin-bottom: clamp(32px, 4vw, 54px); }

.kicker {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--flame);
  margin-bottom: 14px;
}

.sec-head h2, .split-text h2, .contact-info h2, .inquiry h2 {
  font-size: clamp(27px, 3vw, 40px);
  margin-bottom: 14px;
}

.sec-sub, .page-lead {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 60ch;
}

.about-intro { color: var(--ink-soft); margin-bottom: 30px; }

/* ================= 铭牌（签名元素） ================= */

.plate {
  position: relative;
  background:
    radial-gradient(circle at 13px 13px, rgba(198, 209, 216, 0.85) 0 1.7px, rgba(0, 0, 0, 0) 2.2px),
    radial-gradient(circle at calc(100% - 13px) 13px, rgba(198, 209, 216, 0.85) 0 1.7px, rgba(0, 0, 0, 0) 2.2px),
    radial-gradient(circle at 13px calc(100% - 13px), rgba(198, 209, 216, 0.85) 0 1.7px, rgba(0, 0, 0, 0) 2.2px),
    radial-gradient(circle at calc(100% - 13px) calc(100% - 13px), rgba(198, 209, 216, 0.85) 0 1.7px, rgba(0, 0, 0, 0) 2.2px),
    linear-gradient(168deg, #313c44 0%, #222a31 52%, #1b2228 100%);
  border: 1px solid rgba(255, 255, 255, 0.11);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.09), inset 0 -1px 0 rgba(0, 0, 0, 0.5), 0 14px 30px rgba(0, 0, 0, 0.14);
  padding: 18px 20px;
  display: grid;
  gap: 10px;
}

.plate-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  padding-bottom: 8px;
}

.plate-row:last-child { border-bottom: 0; padding-bottom: 0; }

.plate-k {
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8b979f;
  white-space: nowrap;
}

.plate-v {
  font-family: var(--f-mono);
  font-size: 12.5px;
  color: #e7ebed;
  text-align: right;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.55);
  letter-spacing: 0.01em;
}

.plate-sm { padding: 12px 14px; gap: 7px; }
.plate-sm .plate-v { font-size: 11px; }
.plate-sm .plate-k { font-size: 8.5px; letter-spacing: 0.13em; }

.plate-lg { padding: 24px 26px; gap: 13px; }
.plate-lg .plate-v { font-size: 14px; }
.plate-lg .plate-k { font-size: 10px; }

/* ================= 分类条 ================= */

.cat-strip, .filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}

.cat-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 0 16px;
  min-height: 44px;
  border: 1px solid var(--line-light);
  font-size: 14px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.34);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.cat-chip:hover { border-color: var(--ink); color: var(--ink); }
.cat-chip.is-on { background: var(--iron); border-color: var(--iron); color: #fff; }

.cat-code { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.12em; color: var(--flame); }
.cat-chip.is-on .cat-code { color: #e88860; }

/* ================= 卡片网格 ================= */

.grid { display: grid; gap: clamp(16px, 2vw, 26px); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.prod-card {
  display: block;
  background: var(--paper-3);
  border: 1px solid var(--line-light);
  transition: transform 0.26s ease, box-shadow 0.26s ease, border-color 0.26s ease;
}

.prod-card:hover {
  transform: translateY(-3px);
  border-color: rgba(26, 31, 35, 0.35);
  box-shadow: 0 18px 38px rgba(20, 24, 27, 0.13);
}

.prod-card-img { aspect-ratio: 4 / 3; overflow: hidden; background: var(--paper-2); }
.prod-card-img img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.94) contrast(1.02); transition: transform 0.5s ease; }
.prod-card:hover .prod-card-img img { transform: scale(1.03); }

.prod-card-body { padding: 20px 20px 22px; display: grid; gap: 10px; }
.prod-card-body h3 { font-size: 19px; letter-spacing: 0.01em; }
.prod-card-tag { font-size: 13px; color: var(--ink-soft); line-height: 1.6; min-height: 3.2em; }

/* ================= 图文分栏 ================= */

.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(24px, 4vw, 60px); align-items: center; }
.split-wide { grid-template-columns: 1.15fr 1fr; }
.split-media { position: relative; }
.split-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.split-media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(26, 31, 35, 0.16);
  pointer-events: none;
}
.split-text p { color: var(--ink-soft); margin-bottom: 16px; }

.about-band { background: var(--paper-2); }

/* ================= 案例 ================= */

.case-card { display: block; }
.case-img { position: relative; overflow: hidden; aspect-ratio: 16 / 11; background: var(--iron); }
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.case-card:hover .case-img img { transform: scale(1.04); }

.case-tag {
  position: absolute;
  left: 0;
  bottom: 0;
  background: var(--flame);
  color: #fff;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 6px 12px;
}

.case-tag-plain { position: static; display: inline-block; margin-bottom: 14px; }

.case-card h3 { font-size: 20px; margin-top: 16px; }
.case-card p { font-size: 13.5px; color: var(--ink-soft); margin-top: 8px; }

.case-row {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
  padding: clamp(28px, 4vw, 52px) 0;
  border-top: 1px solid var(--line-light);
}

.case-row.is-flip .case-row-img { order: 2; }
.case-row-img img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.case-row-text h2 { font-size: clamp(23px, 2.4vw, 32px); margin-bottom: 12px; }
.case-meta { font-family: var(--f-mono); font-size: 12px; letter-spacing: 0.04em; color: var(--flame); margin-bottom: 16px; }
.case-row-text p { color: var(--ink-soft); font-size: 15px; margin-bottom: 22px; }

.case-hero img { width: 100%; aspect-ratio: 21 / 9; object-fit: cover; }
.case-body { margin-top: 30px; max-width: 76ch; font-size: 16.5px; line-height: 1.9; color: var(--ink-soft); }

/* ================= 新闻 ================= */

.news-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line-light); }

.news-list li { border-bottom: 1px solid var(--line-light); }

.news-list a {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  align-items: baseline;
  gap: 20px;
  padding: 20px 0;
  transition: background 0.2s ease, padding 0.2s ease;
}

.news-list a:hover { background: rgba(255, 255, 255, 0.5); padding-left: 12px; padding-right: 12px; }

.news-date { font-family: var(--f-mono); font-size: 12px; color: var(--ash); letter-spacing: 0.04em; }
.news-title { font-family: var(--f-display); font-weight: 700; font-size: clamp(16px, 1.4vw, 19px); line-height: 1.5; }
.news-tag { font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.1em; color: var(--flame); border: 1px solid rgba(192, 76, 27, 0.36); padding: 3px 9px; white-space: nowrap; }

.news-list-lg a { grid-template-columns: 120px 1fr auto; padding: 26px 0; }
.news-list-lg .news-title { font-size: clamp(18px, 1.7vw, 23px); }

.article { max-width: 74ch; }
.article p { font-size: 17px; line-height: 1.95; color: var(--ink-soft); }

/* ================= 页头 ================= */

.page-head { padding-top: clamp(44px, 6vw, 76px); padding-bottom: clamp(20px, 3vw, 34px); }
.page-head-sm { padding-top: clamp(34px, 4vw, 52px); }
.page-head h1 { font-size: clamp(30px, 4vw, 54px); margin-bottom: 16px; max-width: 20ch; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ash);
  margin-bottom: 18px;
  min-height: 32px;
}

.back-link:hover { color: var(--flame); }

/* ================= 能力 / 时间轴 / 专利 ================= */

.cap-card {
  background: var(--paper-3);
  border: 1px solid var(--line-light);
  border-top: 2px solid var(--iron);
  padding: 26px 24px 28px;
}

.cap-n { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--flame); display: block; margin-bottom: 12px; }
.cap-card h3 { font-size: 20px; margin-bottom: 10px; }
.cap-card p { color: var(--ink-soft); font-size: 14.5px; }

.timeline { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line-light); }

.timeline li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 26px;
  padding: 0 0 26px 28px;
  position: relative;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 11px;
  width: 7px;
  height: 7px;
  background: var(--flame);
}

.tl-year { font-family: var(--f-mono); font-size: 13px; letter-spacing: 0.03em; color: var(--ink); }
.tl-text { color: var(--ink-soft); font-size: 15px; }

.patent-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-light); border: 1px solid var(--line-light); }

.patent-item {
  background: var(--paper-3);
  padding: 20px 22px 22px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.patent-idx { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.14em; color: var(--flame); }
.patent-item p { font-size: 15px; font-weight: 500; line-height: 1.5; }
.patent-no { font-family: var(--f-mono); font-size: 10.5px; color: var(--ash); letter-spacing: 0.04em; }

.export-block {
  margin-top: 40px;
  padding: 30px 28px;
  background: var(--iron);
  color: var(--mist);
  display: grid;
  gap: 12px;
  max-width: 900px;
}

.export-block h3 { color: #fff; font-size: 20px; }
.export-block p { font-size: 15px; line-height: 1.85; color: var(--mist); }

/* ================= 产品详情 ================= */

.detail-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(20px, 3vw, 40px); align-items: start; }
.detail-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--paper-2); }
.detail-side { display: grid; gap: 16px; }

.detail-blocks { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 3vw, 40px); margin-top: clamp(34px, 5vw, 60px); }

.detail-block h3 { font-size: 18px; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid var(--line-light); }

.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table tr { border-bottom: 1px solid var(--line-light); }
.spec-table td { padding: 12px 0; }
.spec-table td:first-child { color: var(--ink-soft); width: 52%; }
.spec-table td:last-child { font-family: var(--f-mono); font-size: 13px; text-align: right; }

.dot-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.dot-list li { display: grid; grid-template-columns: 14px 1fr; gap: 10px; font-size: 14.5px; color: var(--ink-soft); line-height: 1.72; }
.dot-list li::before { content: ""; width: 6px; height: 6px; margin-top: 9px; background: var(--flame); }

.detail-block p { color: var(--ink-soft); font-size: 14.5px; }

.related { margin-top: clamp(44px, 6vw, 76px); }
.related h3 { font-size: 18px; margin-bottom: 20px; }

/* ================= 服务 FAQ ================= */

.faq { border-top: 1px solid var(--line-light); max-width: 900px; }

.faq-item { border-bottom: 1px solid var(--line-light); }

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 0;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: var(--f-body);
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  min-height: 60px;
}

.faq-q:hover { color: var(--flame); }

.faq-sign {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.faq-sign::before, .faq-sign::after {
  content: "";
  position: absolute;
  background: var(--flame);
}

.faq-sign::before { left: 0; top: 6.2px; width: 14px; height: 1.6px; }
.faq-sign::after { left: 6.2px; top: 0; width: 1.6px; height: 14px; transition: transform 0.2s ease; }
.faq-q[aria-expanded="true"] .faq-sign::after { transform: rotate(90deg); }

.faq-a { padding: 0 0 22px; }
.faq-a p { color: var(--ink-soft); font-size: 15px; max-width: 72ch; }

/* ================= 联系 ================= */

.contact-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(26px, 4vw, 56px); align-items: start; }

.contact-info { display: grid; gap: 18px; justify-items: start; }

.big-tel {
  font-family: var(--f-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.2;
  border-bottom: 2px solid var(--flame);
  padding-bottom: 4px;
}

.big-tel:hover { color: var(--flame); }

.contact-info .plate { width: 100%; }

.inquiry {
  background: var(--paper-3);
  border: 1px solid var(--line-light);
  border-top: 3px solid var(--iron);
  padding: clamp(22px, 3vw, 40px);
  display: grid;
  gap: 16px;
}

.form-sub { color: var(--ink-soft); font-size: 14.5px; margin-bottom: 4px; }

.field { display: grid; gap: 7px; }
.field span { font-size: 13px; color: var(--ink-soft); letter-spacing: 0.02em; }

.field input, .field select, .field textarea {
  font-family: var(--f-body);
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid rgba(26, 31, 35, 0.18);
  padding: 11px 13px;
  min-height: 46px;
  border-radius: 0;
  width: 100%;
}

.field textarea { resize: vertical; min-height: 108px; line-height: 1.65; }

.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--flame);
  outline-offset: 1px;
  border-color: var(--flame);
}

.form-note { font-size: 12.5px; color: var(--ash); line-height: 1.7; }
.form-msg { font-size: 13.5px; min-height: 1.4em; }
.form-msg.is-ok { color: #1f6b3f; }
.form-msg.is-err { color: var(--flame-deep); }

/* ================= CTA 带 ================= */

.cta-band {
  background: var(--paper-2);
  color: var(--ink);
  padding: clamp(42px, 6vw, 74px) 0;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  position: relative;
}

.cta-band::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--flame);
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-inner h2 { font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 8px; color: var(--ink); }
.cta-inner p { color: var(--ink-soft); font-size: 15px; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ================= 页脚 ================= */

.site-footer { background: var(--iron); color: var(--mist); border-top: 1px solid var(--line-dark); }

.foot-grid {
  display: grid;
  grid-template-columns: 1.6fr 0.8fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(44px, 5vw, 68px) var(--gut) clamp(30px, 4vw, 44px);
}

.brand-mark {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.08em;
  color: #fff;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark span { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.2em; color: var(--flame); }

.foot-brand p { font-size: 13.5px; color: var(--mist); margin-top: 12px; }
.foot-en { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.06em; color: var(--ash); }
.foot-note { color: var(--ash) !important; font-size: 12px !important; margin-top: 18px !important; line-height: 1.75; max-width: 40ch; }

.foot-col h4 {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ash);
  margin-bottom: 16px;
  font-weight: 400;
}

.foot-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.foot-col ul a { font-size: 14px; color: var(--mist); }
.foot-col ul a:hover { color: #fff; }
.foot-col p { font-size: 13.5px; color: var(--mist); margin-bottom: 12px; line-height: 1.7; }
.foot-col p a { font-family: var(--f-mono); font-size: 13px; }

.foot-bar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line-dark);
  padding-top: 18px;
  padding-bottom: 24px;
  font-size: 12px;
  color: var(--ash);
}

/* ================= 滚动出现 ================= */

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.62s ease, transform 0.62s cubic-bezier(0.22, 0.61, 0.36, 1);
}

[data-reveal].is-in { opacity: 1; transform: none; }

/* ================= 响应式 ================= */

@media (max-width: 1080px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .patent-grid { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .header-tel { display: none; }
}

@media (max-width: 860px) {
  .split, .split-wide, .case-row, .detail-grid, .contact-grid, .detail-blocks, .cta-inner, .hero-inner {
    grid-template-columns: 1fr;
  }
  .case-row.is-flip .case-row-img { order: 0; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 18px var(--gut); }
  .hero-text { max-width: none; }
  .hero-media { order: -1; }
  .hero-media img { aspect-ratio: 16 / 10; }
  .hero-plate { max-width: 88%; }
  .news-list a { grid-template-columns: 100px 1fr; }
  .news-tag { display: none; }
  .foot-grid { grid-template-columns: 1fr; }
  .patent-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  #menu-btn { display: grid; }

  #nav-links {
    position: fixed;
    top: 106px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--iron);
    border-bottom: 1px solid var(--line-dark);
    padding: 8px var(--gut) 18px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.24s ease, transform 0.24s ease;
    max-height: calc(100vh - 130px);
    overflow-y: auto;
  }

  .site-header.nav-open #nav-links { opacity: 1; transform: none; pointer-events: auto; }

  #nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line-dark); min-height: 50px; }
  #nav-links a.is-on::after { left: 0; right: auto; width: 22px; bottom: 8px; }

  .brand-sub { font-size: 8.5px; letter-spacing: 0.12em; }
  .header-inner { min-height: 66px; gap: 14px; }
  .topbar-inner { font-size: 10.5px; }
  .topbar-left { gap: 14px; }
  .hero-inner { padding-top: 56px; padding-bottom: 36px; }
  .hero h1 { max-width: none; font-size: clamp(30px, 8vw, 42px); }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: 88px 1fr; gap: 16px; }
  .news-list a { grid-template-columns: 1fr; gap: 8px; }
  .big-tel { font-size: clamp(22px, 7vw, 30px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ================= 焦点可见 ================= */

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 3px;
}

/* ================= English site typography overrides ================= */

body { letter-spacing: 0.005em; }

h2, h3, .page-head h1 { letter-spacing: 0; }

.hero h1 {
  max-width: 19ch;
  font-size: clamp(30px, 3.9vw, 55px);
  line-height: 1.14;
  letter-spacing: 0;
}

.hero-lead { max-width: 52ch; }

.hero-kicker { letter-spacing: 0.2em; }

.page-head h1 { max-width: 26ch; }

/* 语言按钮在英文站是链接（返回中文站） */
#lang-btn {
  display: inline-block;
  text-decoration: none;
  line-height: 1;
  padding: 7px 12px;
}

.brand-name { letter-spacing: 0.12em; }

.foot-en { letter-spacing: 0.08em; }