/* ============================================================
   上海既兴工业装备有限公司 — 官网样式
   设计语言：技术图纸 / 计量检测报告美学
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --ink-900: #0a1c33;
  --ink-800: #0e2745;
  --ink-700: #14325a;
  --accent: #2e8fd6;
  --accent-dark: #1f6fae;
  --steel-600: #5b6673;
  --steel-500: #7d8794;
  --steel-300: #c4cbd3;
  --steel-200: #dde2e7;
  --steel-100: #eef1f4;
  --white: #ffffff;
  --text: #1d2b3a;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", "Roboto Mono",
    Menlo, monospace;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --radius: 4px;
  --header-h: 68px;
  --maxw: 1180px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.25s var(--ease-out),
    border-color 0.25s var(--ease-out), color 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
  white-space: nowrap;
}

.btn svg {
  transition: transform 0.25s var(--ease-out);
}

.btn:hover svg {
  transform: translateX(3px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-block {
  width: 100%;
}

/* ---------- 区块与标题 ---------- */
.section {
  padding: 104px 0;
}

.section-alt {
  background: var(--steel-100);
}

.section-dark {
  background: var(--ink-900);
}

.section-head {
  max-width: 680px;
  margin-bottom: 56px;
}

.section-label {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 18px;
}

.section-label-light {
  color: #5aa9e2;
}

.index-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.section-dark .section-title {
  color: #fff;
}

.section-desc {
  margin-top: 14px;
  font-size: 16px;
  color: var(--steel-600);
}

.section-desc-light {
  color: #aebccb;
}

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s var(--ease-out),
    border-color 0.3s var(--ease-out);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom-color: var(--steel-200);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  transition: color 0.3s var(--ease-out);
}

.site-header.scrolled .brand {
  color: var(--ink-900);
}

.brand-mark {
  flex: none;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong {
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* 双公司联合标识：默认全称，窄屏切换为简称，避免与右侧导航挤压 */
.brand-names {
  display: inline-flex;
  align-items: baseline;
}

.brand-names i {
  font-style: normal;
  color: var(--accent);
  font-weight: 600;
  margin: 0 1px;
}

.brand-name-short {
  display: none;
}

.brand-text em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--accent);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.main-nav > a {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  padding: 6px 0;
  transition: color 0.25s var(--ease-out);
}

.site-header.scrolled .main-nav > a {
  color: var(--steel-600);
}

.main-nav > a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s var(--ease-out);
}

.main-nav > a:hover,
.main-nav > a.active {
  color: var(--accent);
}

.main-nav > a:hover::after,
.main-nav > a.active::after {
  width: 100%;
}

.main-nav .nav-cta {
  padding: 9px 22px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius);
  color: #fff;
}

.main-nav .nav-cta::after {
  display: none;
}

.site-header.scrolled .main-nav .nav-cta {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}

.main-nav .nav-cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 42px;
  height: 42px;
  padding: 0 9px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: #fff;
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}

.site-header.scrolled .nav-toggle {
  border-color: var(--steel-300);
}

.site-header.scrolled .nav-toggle span {
  background: var(--ink-900);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--ink-900);
  overflow: hidden;
  padding: var(--header-h) 0 72px;
}

/* 坐标网格 */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.045) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 85% 80% at 70% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(
    ellipse 85% 80% at 70% 40%,
    #000 30%,
    transparent 75%
  );
}

.hero-vignette {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    var(--ink-900) 38%,
    rgba(10, 28, 51, 0.72) 62%,
    rgba(10, 28, 51, 0.35) 100%
  );
}

/* Hero 双列：左侧文案 55% / 右侧产品展示卡 45%，两列共享同一垂直中线 */
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(0, 1fr);
  align-items: center;
  column-gap: clamp(36px, 4vw, 64px);
  width: 100%;
}

.hero-copy {
  grid-column: 1;
  min-width: 0;
}

/* 右列产品卡按图片自然比例显示，整体在右列垂直居中 */
.hero-product-card {
  grid-column: 2;
  margin: 0;
  width: 100%;
  justify-self: center;
  align-self: center;
}

/* 产品展示卡：浅色渐变面板 + 发丝边框 + 冷光投影，让白底实机图融入深色 Hero */
.hero-card-media {
  position: relative;
  background: linear-gradient(160deg, #ffffff 0%, #eef2f6 78%, #e3e9f0 100%);
  border: 1px solid rgba(159, 180, 210, 0.55);
  border-radius: 4px;
  aspect-ratio: 820 / 877;
  padding: 7% 9%;
  box-shadow:
    0 34px 70px -28px rgba(0, 0, 0, 0.62),
    0 0 0 1px rgba(46, 143, 214, 0.08),
    0 0 64px -18px rgba(46, 143, 214, 0.5);
  overflow: hidden;
  transition:
    transform 0.5s var(--ease-out),
    box-shadow 0.5s var(--ease-out);
}

.hero-product-card:hover .hero-card-media {
  transform: translateY(-5px);
  box-shadow:
    0 42px 82px -30px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(46, 143, 214, 0.22),
    0 0 80px -16px rgba(46, 143, 214, 0.6);
}

.hero-card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

/* 底部蓝色渐隐遮罩，模拟反射光带，避免白图与面板底边生硬切割 */
.hero-card-fade {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 30%;
  background: linear-gradient(
    180deg,
    rgba(46, 143, 214, 0) 0%,
    rgba(46, 143, 214, 0.1) 72%,
    rgba(46, 143, 214, 0.2) 100%
  );
  pointer-events: none;
}

/* 面板底部测量冷光线 */
.hero-card-media::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.65;
}

/* 型号规格条：等宽参数，紧贴卡片下缘（12px），强化检测报告感 */
.hero-card-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  padding: 0 4px;
}

.hero-card-name {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: #dce8f4;
}

.hero-card-spec {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: #7e93b2;
  text-align: right;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.18em;
  color: #7fa6c9;
  padding: 7px 14px;
  border: 1px solid rgba(126, 147, 178, 0.4);
  border-radius: 2px;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(36px, 5.2vw, 54px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: #fff;
  max-width: 640px;
}

.accent-text {
  position: relative;
  color: transparent;
  background: linear-gradient(90deg, #6fb8ec, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-sub {
  margin-top: 16px;
  max-width: 560px;
  font-size: 16.5px;
  line-height: 1.8;
  color: #b3c1d1;
}

.hero-partner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px 8px;
  margin-top: 24px;
  max-width: 560px;
}

.hero-partner span {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #dce7f1;
  padding: 7px 14px;
  border: 1px solid rgba(126, 147, 178, 0.4);
  border-radius: 2px;
  background: rgba(10, 28, 51, 0.5);
}

.hero-partner i {
  font-style: normal;
  color: var(--accent);
  font-size: 15px;
  margin: 0 4px;
}

.hero-partner em {
  font-style: normal;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: #8fa6c0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

.hero-specs {
  display: flex;
  gap: 0;
  margin-top: 32px;
  border-top: 1px solid rgba(126, 147, 178, 0.28);
  max-width: 560px;
}

.hero-specs div {
  flex: 1;
  padding: 16px 24px 0 0;
}

.hero-specs div + div {
  padding-left: 24px;
  border-left: 1px solid rgba(126, 147, 178, 0.28);
}

.hero-specs dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #7188a4;
  margin-bottom: 6px;
}

.hero-specs dd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 600;
  color: #e4ecf4;
}

.hero-specs-note {
  margin-top: 14px;
  font-size: 12px;
  color: #7188a4;
  letter-spacing: 0.02em;
}

.hero-scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: #627a97;
  z-index: 2;
}

.hero-scroll span {
  width: 1px;
  height: 42px;
  background: linear-gradient(var(--accent), transparent);
  animation: scrollHint 1.8s var(--ease-out) infinite;
  transform-origin: top;
}

@keyframes scrollHint {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  45% {
    transform: scaleY(1);
    transform-origin: top;
  }
  55% {
    transform: scaleY(1);
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

/* ============================================================
   核心优势
   ============================================================ */
.card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--steel-300);
  border-radius: var(--radius);
  transition: border-color 0.3s var(--ease-out),
    transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.advantage-card {
  padding: 34px 26px 32px;
  overflow: hidden;
}

.advantage-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 14px 34px -18px rgba(10, 28, 51, 0.25);
}

/* 角部准星标记 */
.card-corner {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 14px;
  height: 14px;
  opacity: 0.5;
}

.card-corner::before,
.card-corner::after {
  content: "";
  position: absolute;
  background: var(--steel-500);
  transition: background-color 0.3s var(--ease-out);
}

.card-corner::before {
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
}

.card-corner::after {
  top: 50%;
  left: 0;
  height: 1px;
  width: 100%;
}

.advantage-card:hover .card-corner::before,
.advantage-card:hover .card-corner::after {
  background: var(--accent);
}

.card-icon {
  color: var(--ink-800);
  margin-bottom: 22px;
  transition: color 0.3s var(--ease-out);
}

.advantage-card:hover .card-icon {
  color: var(--accent);
}

.advantage-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-900);
  margin-bottom: 12px;
}

.advantage-card p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel-600);
}

/* ============================================================
   产品中心
   ============================================================ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.product-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 18px 40px -22px rgba(10, 28, 51, 0.3);
}

.product-visual {
  position: relative;
  background: var(--steel-100);
  border-bottom: 1px solid var(--steel-200);
  padding: 24px 20px 8px;
}

.product-visual svg {
  width: 100%;
  height: auto;
}

/* Polar7106 真实渲染图（figure 承载）*/
.product-photo {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #fff;
  aspect-ratio: 16 / 9;
  display: block;
}

.product-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.product-photo figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 16px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #fff;
  background: linear-gradient(transparent, rgba(10, 28, 51, 0.82));
}

.product-photo .product-tag {
  top: 0;
}

/* 图片位预留容器（Polar121510 / 定制机型）*/
.visual-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 190px;
}

.product-visual-custom {
  background: repeating-linear-gradient(
    45deg,
    var(--steel-100),
    var(--steel-100) 12px,
    #e7ebef 12px,
    #e7ebef 24px
  );
}

.product-tag {
  position: absolute;
  top: 14px;
  left: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  padding: 4px 10px 4px 12px;
  color: #fff;
  background: var(--ink-800);
  border-radius: 0 2px 2px 0;
}

.product-tag-lg {
  background: var(--ink-900);
}

.product-tag-custom {
  background: var(--accent-dark);
}

.product-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 26px 24px 24px;
}

.product-name {
  font-size: 21px;
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.35;
}

.product-name small {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--steel-500);
  margin-top: 2px;
}

.product-desc {
  margin-top: 12px;
  font-size: 14.5px;
  color: var(--steel-600);
  line-height: 1.75;
}

.spec-table {
  margin-top: 20px;
  border-top: 1px solid var(--steel-200);
}

.spec-table div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--steel-200);
}

.spec-table dt {
  font-size: 12.5px;
  color: var(--steel-500);
  letter-spacing: 0.04em;
  flex: none;
}

.spec-table dd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-800);
  text-align: right;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-dark);
}

.product-link svg {
  transition: transform 0.25s var(--ease-out);
}

.product-link:hover svg {
  transform: translateX(4px);
}

/* ============================================================
   关于我们
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 72px;
  align-items: center;
}

.about-text .section-label {
  margin-bottom: 18px;
}

.about-text .section-title {
  margin-bottom: 24px;
}

.about-text p {
  color: var(--steel-600);
  font-size: 15.5px;
  line-height: 1.9;
}

.about-text p + p {
  margin-top: 16px;
}

.about-text strong {
  color: var(--ink-900);
  font-weight: 600;
}

.about-list {
  margin-top: 28px;
}

.about-list li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--ink-800);
  font-weight: 500;
  line-height: 2.2;
}

.about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 1px;
  background: var(--accent);
}

.about-list li::after {
  content: "";
  position: absolute;
  left: 0;
  top: calc(50% - 3px);
  width: 7px;
  height: 7px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: #fff;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--steel-300);
  border-radius: var(--radius);
  padding: 30px 24px;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.5s var(--ease-out);
}

.stat-card:hover::before {
  transform: scaleY(1);
}

.stat-num {
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 42px;
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.1;
}

.stat-num small {
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
}

.stat-label {
  margin-top: 10px;
  font-size: 13.5px;
  color: var(--steel-600);
}

.stat-note {
  grid-column: 1 / -1;
  font-size: 12px;
  color: var(--steel-500);
  margin-top: 2px;
}

/* ---------- 双公司平级展示 ---------- */
.about-guide {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: -28px 0 40px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--accent-dark);
}

.about-guide::before,
.about-guide::after {
  content: "";
  flex: none;
  width: 44px;
  height: 1px;
  background: var(--steel-300);
}

.company-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.company-card {
  padding: 34px 30px 30px;
  overflow: hidden;
  background: var(--white);
  transition: border-color 0.3s var(--ease-out),
    transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.company-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 18px 40px -22px rgba(10, 28, 51, 0.3);
}

.company-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.company-mark {
  flex: none;
  color: var(--accent);
}

.company-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.35;
}

.company-role {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.company-desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel-600);
}

.company-spec {
  margin-top: 18px;
  border-top: 1px solid var(--steel-200);
}

.company-spec div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--steel-200);
}

.company-spec dt {
  font-size: 12.5px;
  color: var(--steel-500);
  flex: none;
}

.company-spec dd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-800);
  text-align: right;
}

.about-legacy {
  max-width: 860px;
  margin: 0 auto 56px;
  text-align: center;
  font-size: 15px;
  line-height: 1.9;
  color: var(--steel-600);
}

.about-legacy strong {
  color: var(--ink-900);
  font-weight: 600;
}

/* ---------- 发展时间线 ---------- */
.timeline {
  margin: 0 auto 64px;
  max-width: 960px;
}

.timeline-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.timeline-track::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 8.33%;
  right: 8.33%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--steel-300), var(--steel-300), var(--steel-300), transparent);
}

.timeline-item {
  position: relative;
  text-align: center;
  padding: 0 8px;
}

.timeline-item::before {
  content: "";
  position: relative;
  display: block;
  width: 14px;
  height: 14px;
  margin: 33px auto 22px;
  background: var(--white);
  border: 1px solid var(--accent);
  border-radius: 50%;
  z-index: 1;
}

.timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent-dark);
  background: var(--steel-100);
  border: 1px solid var(--steel-200);
  border-radius: 2px;
  padding: 3px 10px;
  margin-bottom: 14px;
}

.timeline-item h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-900);
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel-600);
}

/* ============================================================
   联系我们
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 64px;
  align-items: start;
}

.contact-info .section-dict-light {
  margin-bottom: 40px;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(126, 147, 178, 0.22);
}

.contact-list li:first-child {
  border-top: 1px solid rgba(126, 147, 178, 0.22);
}

.contact-list svg {
  flex: none;
  margin-top: 3px;
  color: var(--accent);
}

.contact-list span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #7188a4;
  margin-bottom: 3px;
}

.contact-list a,
.contact-list address {
  font-style: normal;
  font-size: 16px;
  color: #e4ecf4;
  font-weight: 500;
}

.contact-list a:hover {
  color: var(--accent);
}

.contact-list .contact-person {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: #7188a4;
  text-transform: none;
  margin-left: 8px;
}

.inquiry-form {
  background: var(--ink-800);
  border: 1px solid #1e3454;
  border-radius: var(--radius);
  padding: 36px 32px;
}

.form-row {
  margin-bottom: 18px;
}

.form-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #b3c1d1;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.form-row label em {
  color: var(--accent);
  font-style: normal;
  margin-left: 2px;
}

.form-row input,
.form-row textarea {
  width: 100%;
  background: rgba(10, 28, 51, 0.6);
  border: 1px solid #28425f;
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 15px;
  color: #fff;
  transition: border-color 0.25s var(--ease-out),
    background-color 0.25s var(--ease-out);
  resize: vertical;
}

.form-row input::placeholder,
.form-row textarea::placeholder {
  color: #5d7490;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(10, 28, 51, 0.9);
}

.form-row.invalid input,
.form-row.invalid textarea {
  border-color: #7fa6c9;
}

.inquiry-form .btn {
  margin-top: 6px;
}

.form-feedback {
  margin-top: 14px;
  font-size: 14px;
  min-height: 22px;
  color: #8fd0f0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-feedback.success {
  color: #9fd8f5;
}

.form-feedback.error {
  color: #c9d6e2;
}

.form-feedback.success::before {
  content: "";
  flex: none;
  width: 16px;
  height: 16px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.2 3.2L13 5' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.2 3.2L13 5' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: #071527;
  color: #8ca0b6;
  padding: 40px 0 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #c6d3e1;
  font-size: 15px;
  font-weight: 600;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 26px;
}

.footer-nav a {
  font-size: 13.5px;
  transition: color 0.25s var(--ease-out);
}

.footer-nav a:hover {
  color: var(--accent);
}

.footer-copy {
  font-size: 13px;
  color: #6e849c;
}

.footer-icp {
  font-size: 13px;
}

.footer-icp a:hover {
  color: var(--accent);
}

/* ============================================================
   滚动入场动画
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .hero-scroll span {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .section {
    padding: 84px 0;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
  }

  .hero-product-card {
    width: 96%;
  }

  .advantage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  .about-grid {
    gap: 48px;
  }
}

@media (max-width: 860px) {
  /* Hero 单列：badge→H1→描述→品牌标签→产品卡→CTA→参数条 */
  .hero-inner {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .hero-copy {
    display: contents;
  }

  .hero-eyebrow {
    order: 1;
  }

  .hero-title {
    order: 2;
  }

  .hero-sub {
    order: 3;
  }

  .hero-partner {
    order: 4;
  }

  .hero-product-card {
    order: 5;
    align-self: center;
    width: 100%;
    max-width: 520px;
    margin: 32px 0 4px;
  }

  .hero-actions {
    order: 6;
  }

  .hero-specs {
    order: 7;
  }

  .hero-specs-note {
    order: 8;
  }

  /* 单列时右侧暗角改为底部压暗，保证卡片与文案可读 */
  .hero-vignette {
    background: linear-gradient(
      180deg,
      rgba(10, 28, 51, 0.82) 0%,
      rgba(10, 28, 51, 0.72) 42%,
      var(--ink-900) 82%
    );
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-stats {
    max-width: 520px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 60px;
  }

  .section {
    padding: 64px 0;
  }

  .section-head {
    margin-bottom: 40px;
  }

  .section-title {
    font-size: 26px;
  }

  /* 移动端导航：全屏深蓝面板 */
  .nav-toggle {
    display: flex;
    z-index: 110;
  }

  .main-nav {
    position: fixed;
    inset: 0;
    z-index: 105;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 8px;
    padding: 0 40px;
    background: var(--ink-900);
    transform: translateY(-100%);
    transition: transform 0.4s var(--ease-out);
    visibility: hidden;
  }

  .main-nav.open {
    transform: translateY(0);
    visibility: visible;
  }

  .main-nav > a {
    font-size: 22px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9) !important;
    padding: 12px 0;
    width: 100%;
    border-bottom: 1px solid rgba(126, 147, 178, 0.18);
  }

  .main-nav > a::after {
    display: none;
  }

  .main-nav .nav-cta {
    margin-top: 20px;
    text-align: center;
    border: 1px solid var(--accent);
    background: transparent;
    width: 100%;
  }

  /* 菜单展开时，固定按钮保持浅色 */
  .nav-toggle.open {
    border-color: rgba(255, 255, 255, 0.4);
  }

  .nav-toggle.open span {
    background: #fff;
  }

  body.nav-lock {
    overflow: hidden;
  }

  /* Hero */
  .hero {
    padding-bottom: 88px;
  }

  .hero-product-card {
    max-width: 440px;
    margin-top: 32px;
  }

  .hero-card-meta {
    flex-direction: column;
    gap: 3px;
  }

  .hero-card-spec {
    text-align: left;
  }

  .hero-sub .br-md {
    display: none;
  }

  .hero-specs {
    margin-top: 32px;
    flex-wrap: wrap;
  }

  .hero-specs div {
    flex: 1 1 33%;
    min-width: 120px;
    padding: 16px 12px 0 0 !important;
  }

  .hero-specs div + div {
    padding-left: 12px !important;
  }

  .hero-scroll {
    display: none;
  }

  .inquiry-form {
    padding: 28px 22px;
  }

  /* 双公司卡片堆叠 */
  .company-grid {
    grid-template-columns: 1fr;
  }

  .about-guide {
    font-size: 12.5px;
    letter-spacing: 0.1em;
  }

  /* 时间线纵向 */
  .timeline-track {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .timeline-track::before {
    display: none;
  }

  .timeline-item {
    text-align: left;
    padding: 0 0 0 30px;
    position: relative;
  }

  .timeline-item::before {
    position: absolute;
    left: 0;
    top: 22px;
    margin: 0;
    z-index: 1;
    background: var(--white);
  }

  .timeline-item::after {
    content: "";
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--steel-200);
  }

  .timeline-item:last-child::after {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }

  .brand-text strong {
    font-size: 14.5px;
  }

  /* 窄屏品牌主行简化为「燧启 × 既兴」 */
  .brand-name-full {
    display: none;
  }

  .brand-name-short {
    display: inline;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

  .stat-num {
    font-size: 34px;
  }

  .hero-specs {
    flex-direction: column;
    border-left: none;
  }

  .hero-specs div {
    border-left: none !important;
    padding-left: 0 !important;
  }
}