/* =========================================================
   博海海洋工程 · Bohai Marine
   手写样式表 · 无框架依赖
   1. 设计令牌  2. 基础  3. 组件  4. 页面区块  5. 响应式
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --ink-950: #04141f;
  --ink-900: #06202f;
  --ink-800: #0a2c3f;
  --ink-700: #103a50;
  --teal-700: #0a7178;
  --teal-600: #0e8c93;
  --teal-500: #14a3a9;
  --sand-400: #c9a96a;
  --sand-200: #eadfc8;
  --paper: #f7f8f8;
  --mist: #eef2f4;
  --line: #e2e8ec;
  --body: #4b5d6a;
  --white: #ffffff;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 76px;
  --shell: 1280px;
  --gutter: 24px;

  --f-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

/* ---------- 2. 基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--ink-900);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
dd,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

::selection {
  background: var(--teal-600);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--teal-500);
  outline-offset: 3px;
}

.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;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -60px;
  z-index: 200;
  background: var(--ink-900);
  color: #fff;
  padding: 10px 16px;
  font-size: 13px;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 16px;
}

/* ---------- 版式 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.display {
  font-size: clamp(2.4rem, 5.4vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 600;
}

.h2 {
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -0.03em;
  font-weight: 600;
}

.h3 {
  font-size: clamp(1.1rem, 1.4vw, 1.35rem);
  line-height: 1.35;
  letter-spacing: -0.015em;
  font-weight: 600;
}

.lead {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--body);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--teal-600);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 32px;
  height: 1px;
  background: currentColor;
}

.text-white {
  color: #fff;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn svg {
  flex: none;
}

.btn--solid {
  background: var(--ink-900);
  color: #fff;
}

.btn--solid:hover {
  background: var(--ink-700);
}

.btn--teal {
  background: var(--teal-600);
  color: #fff;
}

.btn--teal:hover {
  background: var(--teal-700);
}

.btn--light {
  background: #fff;
  color: var(--ink-900);
}

.btn--light:hover {
  background: var(--mist);
}

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

.btn--ghost:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.btn--outline {
  border-color: rgba(6, 32, 47, 0.2);
  color: var(--ink-900);
}

.btn--outline:hover {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}

.btn--block {
  width: 100%;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-900);
  transition: color 0.3s var(--ease);
}

.link-arrow:hover {
  color: var(--teal-600);
}

.link-arrow svg {
  transition: transform 0.3s var(--ease);
}

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

.link-arrow--light {
  color: #fff;
}

.link-arrow--light:hover {
  color: var(--teal-500);
}

/* ---------- 图标 ---------- */
.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.icon--xs {
  width: 14px;
  height: 14px;
}

.icon--sm {
  width: 16px;
  height: 16px;
}

.icon--lg {
  width: 28px;
  height: 28px;
  stroke-width: 1.2;
}

/* =========================================================
   3. 组件
   ========================================================= */

/* ---------- Header ---------- */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  transition: transform 0.5s var(--ease), opacity 0.5s var(--ease), background-color 0.5s var(--ease),
    box-shadow 0.5s var(--ease);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--header-h);
}

.header.is-solid {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(6, 32, 47, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  transition: color 0.3s var(--ease);
}

.header.is-solid .brand {
  color: var(--ink-900);
}

.brand__mark {
  width: 32px;
  height: 32px;
  flex: none;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand__name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.brand__sub {
  margin-top: 5px;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.6;
}

.nav {
  display: none;
  align-items: center;
  gap: 32px;
}

.nav__link {
  position: relative;
  padding: 8px 0;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.3s var(--ease);
}

.header.is-solid .nav__link {
  color: rgba(6, 32, 47, 0.7);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 1px;
  width: 100%;
  background: var(--teal-600);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav__link:hover,
.nav__link.is-active {
  color: #fff;
}

.header.is-solid .nav__link:hover,
.header.is-solid .nav__link.is-active {
  color: var(--ink-900);
}

.header.is-solid .nav__link.is-active {
  color: var(--teal-700);
}

.nav__link.is-active::after,
.nav__link:hover::after {
  transform: scaleX(1);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header__cta {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 2px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #fff;
  transition: all 0.3s var(--ease);
}

.header__cta:hover {
  background: #fff;
  color: var(--ink-900);
}

.header.is-solid .header__cta {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}

.header.is-solid .header__cta:hover {
  background: var(--teal-700);
  border-color: var(--teal-700);
}

/* 语言切换 */
.lang {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 顶部导航内的语言切换在桌面端才显示（移动端放在抽屉菜单里） */
.header__actions .lang {
  display: none;
}

.lang__item {
  padding: 4px 8px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.6);
  transition: all 0.3s var(--ease);
}

.lang__item:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.lang__item.is-active {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.1);
}

.header.is-solid .lang__item {
  color: rgba(6, 32, 47, 0.5);
}

.header.is-solid .lang__item:hover {
  color: var(--ink-900);
  border-color: rgba(6, 32, 47, 0.4);
}

.header.is-solid .lang__item.is-active {
  color: var(--ink-900);
  border-color: var(--ink-900);
  background: transparent;
}

.lang--full .lang__item {
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* 汉堡按钮 */
.burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  transition: all 0.3s var(--ease);
}

.header.is-solid .burger,
body.nav-open .burger {
  border-color: rgba(6, 32, 47, 0.15);
  color: var(--ink-900);
}

body.nav-open .burger {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

/* 汉堡按钮内的两个图标按状态切换 */
.burger .icon--close {
  display: none;
}

body.nav-open .burger .icon--menu {
  display: none;
}

body.nav-open .burger .icon--close {
  display: block;
}

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  padding-top: var(--header-h);
  background: var(--ink-950);
  color: #fff;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease), visibility 0.45s;
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.mobile-menu__inner {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: space-between;
  overflow-y: auto;
  padding-top: 32px;
  padding-bottom: 40px;
}

.mobile-menu__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 19px;
  font-weight: 500;
}

.mobile-menu__num {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.3);
  font-variant-numeric: tabular-nums;
}

.mobile-menu__foot {
  margin-top: 40px;
  display: grid;
  gap: 14px;
}

.mobile-menu__contact {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
}

.mobile-menu__contact .icon {
  color: var(--teal-500);
}

.mobile-menu__lang {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-menu__lang-label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
}

/* ---------- Hero 轮播 ---------- */
.hero {
  position: relative;
  height: 100svh;
  min-height: 620px;
  overflow: hidden;
  background: var(--ink-950);
  color: #fff;
}

.hero__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.1s var(--ease);
}

.hero__slide.is-active {
  opacity: 1;
  pointer-events: auto;
}

.hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__slide.is-active .hero__img {
  animation: kenburns 12s var(--ease) forwards;
}

.hero__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--ink-950) 0%, rgba(4, 20, 31, 0.45) 45%, rgba(4, 20, 31, 0.2) 100%);
}

.hero__shade--side {
  background: linear-gradient(
    to right,
    rgba(4, 20, 31, 0.92) 0%,
    rgba(4, 20, 31, 0.62) 42%,
    rgba(4, 20, 31, 0.18) 72%,
    transparent 100%
  );
}

.hero__body {
  position: relative;
  z-index: 2;
  display: flex;
  height: 100%;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: 128px;
}

.hero__content {
  max-width: 760px;
}

.hero__slide.is-active .hero__content > * {
  animation: fadeUp 0.75s var(--ease) both;
}

.hero__slide.is-active .hero__content > *:nth-child(2) {
  animation-delay: 0.08s;
}

.hero__slide.is-active .hero__content > *:nth-child(3) {
  animation-delay: 0.16s;
}

.hero__slide.is-active .hero__content > *:nth-child(4) {
  animation-delay: 0.24s;
}

.hero__eyebrow {
  color: var(--teal-500);
}

.hero__title {
  margin-top: 22px;
  font-size: clamp(2.4rem, 5.4vw, 4.6rem);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: #fff;
  white-space: pre-line;
}

.hero__lead {
  margin-top: 26px;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.65);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 38px;
}

/* 右侧索引 */
.hero__index {
  position: absolute;
  right: 56px;
  bottom: 150px;
  z-index: 3;
  display: none;
  flex-direction: column;
  gap: 18px;
}

.hero__index-item {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  transition: color 0.3s var(--ease);
}

.hero__index-item:hover {
  color: rgba(255, 255, 255, 0.7);
}

.hero__index-item.is-active {
  color: #fff;
}

.hero__index-item.is-active .hero__index-num {
  color: var(--teal-500);
}

.hero__index-num {
  font-variant-numeric: tabular-nums;
}

.hero__index-bar {
  display: block;
  width: 16px;
  height: 1px;
  background: rgba(255, 255, 255, 0.25);
  transition: width 0.4s var(--ease), background-color 0.4s var(--ease);
}

.hero__index-item.is-active .hero__index-bar {
  width: 40px;
  background: var(--teal-500);
}

/* 底部控制条 */
.hero__bar {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 4;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  background: linear-gradient(to top, rgba(4, 20, 31, 0.7), transparent);
}

.hero__bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.scroll-cue {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 10px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.scroll-cue__line {
  position: relative;
  display: block;
  width: 1px;
  height: 28px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.2);
}

.scroll-cue__line::after {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 1px;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  animation: scrollcue 2.4s var(--ease) infinite;
}

.hero__controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero__counter {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.7);
  font-variant-numeric: tabular-nums;
}

.hero__counter span {
  color: rgba(255, 255, 255, 0.3);
}

.hero__bars {
  display: none;
  align-items: center;
  gap: 6px;
}

.hero__bar-btn {
  padding: 8px 0;
  width: 56px;
}

.hero__bar-track {
  display: block;
  height: 2px;
  background: rgba(255, 255, 255, 0.2);
  overflow: hidden;
}

.hero__bar-fill {
  display: block;
  height: 100%;
  width: 100%;
  background: #fff;
  transform: scaleX(0);
  transform-origin: left;
}

.hero__bar-btn.is-past .hero__bar-fill {
  transform: scaleX(1);
}

.hero__bar-btn.is-active .hero__bar-fill {
  animation: heroProgress var(--hero-duration, 7000ms) linear forwards;
}

.hero.is-paused .hero__bar-btn.is-active .hero__bar-fill {
  animation-play-state: paused;
}

.hero__arrows {
  display: flex;
  gap: 8px;
}

.arrow-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  transition: all 0.3s var(--ease);
}

.arrow-btn:hover {
  background: #fff;
  border-color: #fff;
  color: var(--ink-900);
}

/* ---------- 页面头部 ---------- */
.page-hero {
  position: relative;
  overflow: hidden;
  padding-top: var(--header-h);
  background: var(--ink-950);
  color: #fff;
}

.page-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
}

.page-hero__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, var(--ink-950) 0%, rgba(4, 20, 31, 0.88) 45%, rgba(4, 20, 31, 0.35) 100%);
}

.page-hero__lines {
  position: absolute;
  inset: 0;
  opacity: 0.55;
}

.page-hero__inner {
  position: relative;
  padding-top: 88px;
  padding-bottom: 88px;
}

.page-hero--compact .page-hero__inner {
  padding-top: 64px;
  padding-bottom: 56px;
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}

.crumbs a:hover {
  color: #fff;
}

.crumbs__sep {
  color: rgba(255, 255, 255, 0.25);
}

.crumbs__current {
  color: rgba(255, 255, 255, 0.7);
}

.page-hero__title {
  margin-top: 20px;
  max-width: 900px;
  font-size: clamp(1.9rem, 4vw, 3.4rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #fff;
}

.page-hero--compact .page-hero__title {
  font-size: clamp(1.7rem, 3.2vw, 2.6rem);
}

.page-hero__lead {
  margin-top: 22px;
  max-width: 660px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.6);
}

.page-hero__strip {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.page-hero__strip .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
}

.page-hero__strip svg {
  color: var(--teal-500);
  transform: rotate(90deg);
}

/* ---------- 区块 ---------- */
.section {
  padding: 96px 0;
}

.section--paper {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section--line {
  border-top: 1px solid var(--line);
}

.section--dark {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: #fff;
}

.section--dark .h2,
.section--dark .h3 {
  color: #fff;
}

.section--dark .lead {
  color: rgba(255, 255, 255, 0.6);
}

.grid-lines {
  background-image: linear-gradient(to right, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 96px 96px;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.section-head__main {
  max-width: 660px;
}

.section-head__title {
  margin-top: 20px;
}

.section-head__lead {
  margin-top: 20px;
  max-width: 560px;
}

.section-head__link {
  align-self: flex-start;
}

/* ---------- 简介 + 数据 ---------- */
.intro-grid {
  display: grid;
  gap: 56px;
}

.intro-grid__body p + p {
  margin-top: 18px;
}

.intro-grid__body p {
  font-size: 14px;
  line-height: 1.95;
  color: rgba(75, 93, 106, 0.92);
}

.intro-grid__link {
  margin-top: 32px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px 0;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.stat__value {
  font-size: clamp(2rem, 3vw, 2.6rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.stat__label {
  margin-top: 12px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.65);
}

/* ---------- 业务卡片 ---------- */
.biz-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px 24px;
  margin-top: 64px;
}

.biz-card {
  display: block;
}

.biz-card__media {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--mist);
}

.biz-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.1s var(--ease);
}

.biz-card:hover .biz-card__media img {
  transform: scale(1.05);
}

.biz-card__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(4, 20, 31, 0.55), transparent 55%);
}

.biz-card__num {
  position: absolute;
  left: 20px;
  top: 20px;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.75);
  font-variant-numeric: tabular-nums;
}

.biz-card__title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
}

.biz-card__title svg {
  flex: none;
  margin-top: 4px;
  color: var(--teal-600);
  transition: transform 0.3s var(--ease);
}

.biz-card:hover .biz-card__title svg {
  transform: translate(2px, -2px);
}

.biz-card__desc {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--body);
}

/* ---------- 案例卡片 ---------- */
.case-grid {
  display: grid;
  gap: 20px;
  margin-top: 56px;
}

.case-card {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-950);
}

.case-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
}

.case-card--wide .case-card__media {
  aspect-ratio: 16 / 10;
}

.case-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
  transition: transform 1.1s var(--ease);
}

.case-card:hover .case-card__media img {
  transform: scale(1.05);
}

.case-card__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(4, 20, 31, 0.92), rgba(4, 20, 31, 0.25) 55%, transparent);
}

.case-card__body {
  position: absolute;
  inset: auto 0 0 0;
  padding: 20px;
}

.case-card__meta {
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal-400, #4cc4c9);
}

.case-card__title {
  margin-top: 8px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.4;
  color: #fff;
}

.case-card__loc {
  margin-top: 6px;
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- 优势网格 ---------- */
.adv-grid {
  display: grid;
  gap: 1px;
  margin-top: 64px;
  background: rgba(255, 255, 255, 0.1);
}

.adv-card {
  background: var(--ink-900);
  padding: 32px;
  transition: background-color 0.5s var(--ease);
}

.adv-card:hover {
  background: var(--ink-800);
}

.adv-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.adv-card__top .icon {
  color: var(--teal-500);
}

.adv-card__num {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.25);
  font-variant-numeric: tabular-nums;
}

.adv-card__title {
  margin-top: 32px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
}

.adv-card__desc {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.55);
}

/* ---------- 流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px 24px;
  margin-top: 64px;
}

.step__head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.step__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: none;
  border: 1px solid rgba(6, 32, 47, 0.15);
  border-radius: 50%;
  font-size: 11.5px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.step__rule {
  display: none;
  flex: 1;
  height: 1px;
  background: var(--line);
}

.step__title {
  margin-top: 20px;
  font-size: 15px;
  font-weight: 600;
}

.step__desc {
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 技术 / 图文两栏 ---------- */
.split {
  display: grid;
  gap: 56px;
  align-items: center;
}

.split__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--mist);
}

.split__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tech-list {
  margin-top: 36px;
  border-top: 1px solid var(--line);
}

.tech-list__item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.tech-list__dot {
  margin-top: 7px;
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--teal-600);
}

.tech-list__title {
  font-size: 14.5px;
  font-weight: 600;
}

.tech-list__desc {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--body);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.chip {
  padding: 6px 12px;
  border: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--body);
}

/* ---------- 新闻列表 ---------- */
.news-list {
  margin-top: 48px;
  border-top: 1px solid var(--line);
}

.news-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.news-row__main {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.news-row__date {
  flex: none;
  width: 96px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(75, 93, 106, 0.55);
  font-variant-numeric: tabular-nums;
}

.news-row__title {
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.5;
  transition: color 0.3s var(--ease);
}

.news-row:hover .news-row__title {
  color: var(--teal-700);
}

.news-row__arrow {
  flex: none;
  margin-top: 2px;
  color: rgba(75, 93, 106, 0.4);
  transition: all 0.3s var(--ease);
}

.news-row:hover .news-row__arrow {
  color: var(--teal-700);
  transform: translateX(4px);
}

/* ---------- CTA 区块 ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: #fff;
}

.cta-band__lines {
  position: absolute;
  inset: 0;
  opacity: 0.7;
}

.cta-band__glow {
  position: absolute;
  right: -96px;
  top: -96px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--teal-600) 0%, transparent 70%);
  opacity: 0.3;
  filter: blur(48px);
}

.cta-band__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding-top: 80px;
  padding-bottom: 80px;
}

.cta-band__body {
  max-width: 660px;
}

.cta-band__title {
  margin-top: 20px;
  color: #fff;
}

.cta-band__lead {
  margin-top: 20px;
  color: rgba(255, 255, 255, 0.6);
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--ink-950);
  color: rgba(255, 255, 255, 0.6);
}

.footer__grid {
  display: grid;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 64px;
}

.footer .brand {
  color: #fff;
}

.footer__about {
  margin-top: 28px;
  max-width: 380px;
  font-size: 13.5px;
  line-height: 1.9;
}

.footer__lang {
  margin-top: 32px;
}

.footer__lang-label {
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.3);
}

.footer__title {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.3);
}

.footer__links {
  margin-top: 20px;
  display: grid;
  gap: 12px;
  font-size: 13.5px;
}

.footer__links a {
  transition: color 0.3s var(--ease);
}

.footer__links a:hover {
  color: #fff;
}

.footer__contact-item {
  display: flex;
  gap: 10px;
  line-height: 1.7;
}

.footer__contact-item .icon {
  flex: none;
  margin-top: 3px;
  color: var(--teal-500);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__bottom .shell {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 24px;
  padding-bottom: 24px;
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.35);
}

/* ---------- 产品列表 ---------- */
.product-rows {
  display: grid;
  gap: 80px;
}

.product-row {
  display: grid;
  gap: 40px;
  align-items: center;
}

.product-row__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--mist);
}

.product-row__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-row__kicker {
  display: flex;
  align-items: center;
  gap: 16px;
}

.product-row__num {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(75, 93, 106, 0.45);
  font-variant-numeric: tabular-nums;
}

.product-row__rule {
  width: 32px;
  height: 1px;
  background: var(--line);
}

.product-row__series {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal-700);
}

.product-row__title {
  margin-top: 20px;
}

.product-row__summary {
  margin-top: 16px;
}

.feature-list {
  display: grid;
  gap: 10px 24px;
  margin-top: 28px;
}

.feature-list__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--body);
}

.feature-list__item .icon {
  flex: none;
  margin-top: 4px;
  color: var(--teal-600);
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
}

.spec {
  background: #fff;
  padding: 12px;
}

.spec__label {
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.55);
}

.spec__value {
  margin-top: 6px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.product-row__link {
  margin-top: 32px;
}

/* ---------- 产品详情 ---------- */
.detail-layout {
  display: grid;
  gap: 56px;
}

.detail-block + .detail-block {
  margin-top: 48px;
}

.detail-block__title {
  font-size: 18px;
  color: var(--teal-700);
}

.detail-block__text {
  margin-top: 16px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--body);
}

.aside-card {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 28px;
}

.aside-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--mist);
}

.aside-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.aside-card__text {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--body);
}

.aside-card__btn {
  margin-top: 24px;
}

.aside-card__back {
  margin-top: 20px;
  display: flex;
  justify-content: center;
}

.spec-table {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.spec-table__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.spec-table__key {
  font-size: 13px;
  color: rgba(75, 93, 106, 0.7);
}

.spec-table__val {
  font-size: 13.5px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
}

.feature-grid__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 20px;
  background: #fff;
  font-size: 13.5px;
  line-height: 1.75;
}

.feature-grid__item .icon {
  flex: none;
  margin-top: 3px;
  color: var(--teal-600);
}

.related-grid {
  display: grid;
  gap: 24px;
  margin-top: 32px;
}

.related-card {
  border: 1px solid var(--line);
  background: #fff;
  transition: border-color 0.3s var(--ease);
}

.related-card:hover {
  border-color: rgba(6, 32, 47, 0.3);
}

.related-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--mist);
}

.related-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.9s var(--ease);
}

.related-card:hover .related-card__media img {
  transform: scale(1.04);
}

.related-card__body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px;
}

.related-card__title {
  font-size: 14.5px;
  font-weight: 600;
}

.related-card__body .icon {
  color: var(--teal-600);
}

/* ---------- 解决方案 ---------- */
.solution-item {
  display: grid;
  gap: 32px;
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.solution-item__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.solution-item__num {
  font-size: clamp(2rem, 3.4vw, 2.8rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--line);
  font-variant-numeric: tabular-nums;
}

.solution-item__scene {
  margin-top: 20px;
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.55);
}

.solution-item__lead {
  font-size: 15px;
  line-height: 1.9;
  color: rgba(6, 32, 47, 0.85);
}

.bullet-grid {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
}

.bullet-grid__item {
  padding: 20px;
  background: #fff;
  font-size: 13px;
  line-height: 1.75;
  color: var(--body);
}

.bullet-grid__item .icon {
  display: block;
  margin-bottom: 12px;
  color: var(--teal-600);
}

/* ---------- 案例筛选 ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.filter {
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--body);
  transition: all 0.3s var(--ease);
}

.filter:hover {
  border-color: rgba(6, 32, 47, 0.4);
  color: var(--ink-900);
}

.filter.is-active {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: #fff;
}

.filter__count {
  margin-left: 8px;
  font-size: 11px;
  opacity: 0.5;
  font-variant-numeric: tabular-nums;
}

.case-list {
  display: grid;
  gap: 48px 32px;
  margin-top: 40px;
}

.case-item__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--mist);
}

.case-item__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.9s var(--ease);
}

.case-item:hover .case-item__media img {
  transform: scale(1.04);
}

.case-item__tag {
  position: absolute;
  left: 0;
  top: 0;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.95);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-900);
}

.case-item__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal-700);
}

.case-item__meta-rule {
  width: 24px;
  height: 1px;
  background: rgba(10, 113, 120, 0.4);
}

.case-item__title {
  margin-top: 12px;
}

.case-item__summary {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--body);
}

.case-item__dl {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 6px;
  font-size: 12.5px;
  color: var(--body);
}

.case-item__dl div {
  display: flex;
  gap: 12px;
}

.case-item__dl dt {
  width: 64px;
  flex: none;
  color: rgba(75, 93, 106, 0.55);
}

.case-item[hidden] {
  display: none;
}

.case-empty {
  padding: 64px 0;
  text-align: center;
  font-size: 14px;
  color: var(--body);
}

.case-empty[hidden] {
  display: none;
}

/* ---------- 关于 ---------- */
.value-grid {
  display: grid;
  gap: 1px;
  margin-top: 56px;
  background: var(--line);
}

.value-card {
  background: var(--paper);
  padding: 40px;
}

.value-card__num {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--teal-700);
  font-variant-numeric: tabular-nums;
}

.value-card__title {
  margin-top: 24px;
}

.value-card__desc {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--body);
}

.milestone-grid {
  display: grid;
  gap: 1px;
  margin-top: 56px;
  background: rgba(255, 255, 255, 0.1);
}

.milestone {
  background: var(--ink-900);
  padding: 28px;
}

.milestone__year {
  font-size: clamp(1.6rem, 2.4vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.milestone__text {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.55);
}

.capability-list {
  margin-top: 36px;
  border-top: 1px solid var(--line);
}

.capability-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.capability-row dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.55);
}

.capability-row dd {
  font-size: 13.5px;
  font-weight: 500;
}

/* ---------- 新闻 ---------- */
.news-grid {
  display: grid;
  gap: 48px 32px;
  padding-top: 64px;
}

.news-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--mist);
}

.news-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1s var(--ease);
}

.news-card:hover .news-card__media img {
  transform: scale(1.04);
}

.news-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal-700);
}

.news-card__meta-rule {
  width: 20px;
  height: 1px;
  background: rgba(10, 113, 120, 0.4);
}

.news-card__title {
  margin-top: 12px;
  line-height: 1.4;
  transition: color 0.3s var(--ease);
}

.news-card:hover .news-card__title {
  color: var(--teal-700);
}

.news-card__excerpt {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--body);
}

.news-card__more {
  margin-top: 20px;
}

.article {
  max-width: 760px;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.55);
}

.article__meta time {
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.article__media {
  position: relative;
  margin-top: 32px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--mist);
}

.article__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article__lead {
  margin-top: 40px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(6, 32, 47, 0.85);
}

.article__p {
  margin-top: 24px;
  font-size: 14.5px;
  line-height: 2;
  color: var(--body);
}

.article__foot {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.related-list {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

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

.related-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
}

.related-list__inside {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-list time {
  width: 96px;
  flex: none;
  font-size: 11.5px;
  color: rgba(75, 93, 106, 0.55);
  font-variant-numeric: tabular-nums;
}

.related-list__title {
  font-size: 14.5px;
  font-weight: 500;
  transition: color 0.3s var(--ease);
}

.related-list a:hover .related-list__title {
  color: var(--teal-700);
}

/* ---------- 联系 ---------- */
.contact-grid {
  display: grid;
  gap: 48px;
}

.form {
  border: 1px solid var(--line);
  background: #fff;
  padding: 28px;
}

.form__grid {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.form__field {
  display: block;
}

.form__label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--body);
}

.field {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
  font: inherit;
  font-size: 14px;
  color: var(--ink-900);
  outline: none;
  transition: border-color 0.3s var(--ease);
}

.field:focus {
  border-color: var(--teal-600);
}

.field::placeholder {
  color: rgba(75, 93, 106, 0.55);
}

textarea.field {
  resize: vertical;
  min-height: 120px;
}

.form__submit {
  margin-top: 28px;
}

.form__note {
  margin-top: 16px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(75, 93, 106, 0.7);
}

.form__msg {
  margin-top: 20px;
  font-size: 13px;
}

.form__msg--error {
  color: #b4342b;
}

.form__msg--ok {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--teal-700);
}

.form__msg[hidden] {
  display: none;
}

.info-list {
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.info-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.info-row .icon {
  flex: none;
  margin-top: 3px;
  color: var(--teal-600);
}

.info-row__label {
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.55);
}

.info-row__value {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.75;
}

.info-row__value a:hover {
  color: var(--teal-700);
}

.notice {
  margin-top: 24px;
  padding: 16px;
  border: 1px solid var(--sand-200);
  background: rgba(234, 223, 200, 0.25);
  font-size: 12px;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 法务页 ---------- */
.legal {
  max-width: 760px;
}

.legal__updated {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(75, 93, 106, 0.55);
}

.legal__intro {
  margin-top: 24px;
  padding-left: 20px;
  border-left: 2px solid var(--teal-600);
  font-size: 13.5px;
  line-height: 1.95;
  color: var(--body);
}

.legal__section + .legal__section {
  margin-top: 40px;
}

.legal__section:first-of-type {
  margin-top: 48px;
}

.legal__num {
  margin-right: 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--teal-700);
  font-variant-numeric: tabular-nums;
}

.legal__p {
  margin-top: 16px;
  font-size: 14px;
  line-height: 2;
  color: var(--body);
}

/* ---------- 404 ---------- */
.notfound {
  position: relative;
  overflow: hidden;
  padding-top: var(--header-h);
  background: var(--ink-950);
  color: #fff;
}

.notfound__lines {
  position: absolute;
  inset: 0;
  opacity: 0.5;
}

.notfound__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 70vh;
  padding-top: 96px;
  padding-bottom: 96px;
}

.notfound__code {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--teal-500);
}

.notfound__title {
  margin-top: 24px;
  max-width: 620px;
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #fff;
}

.notfound__desc {
  margin-top: 24px;
  max-width: 520px;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.6);
}

.notfound__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
}

/* ---------- 动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  transition-delay: var(--d, 0ms);
}

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

@keyframes kenburns {
  from {
    transform: scale(1.01);
  }
  to {
    transform: scale(1.08);
  }
}

@keyframes scrollcue {
  0% {
    transform: translateY(-100%);
  }
  60% {
    transform: translateY(100%);
  }
  100% {
    transform: translateY(100%);
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes heroProgress {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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

/* =========================================================
   5. 响应式
   ========================================================= */
@media (min-width: 640px) {
  .biz-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .spec-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .bullet-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .value-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .related-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

  .footer__bottom .shell {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .cta-band__inner {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .section-head__link {
    align-self: auto;
    flex: none;
  }
}

@media (min-width: 768px) {
  :root {
    --gutter: 40px;
  }

  .section {
    padding: 120px 0;
  }

  .page-hero__inner {
    padding-top: 104px;
    padding-bottom: 96px;
  }

  .stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .stat {
    padding-left: 32px;
    border-left: 1px solid var(--line);
  }

  .stat:first-child {
    padding-left: 0;
    border-left: 0;
  }

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

  .milestone-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .news-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 32px;
  }

  .contact-grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 64px;
  }

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

  .form__field--full {
    grid-column: 1 / -1;
  }

  .form {
    padding: 36px;
  }

  .news-row {
    align-items: center;
  }

  .news-row__main {
    flex-direction: row;
    align-items: baseline;
    gap: 32px;
  }

  .news-row__title {
    font-size: 16px;
  }

  .detail-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
  }

  .aside-wrap {
    position: sticky;
    top: 112px;
  }

  .case-card__body {
    padding: 24px;
  }

  .case-card__title {
    font-size: 17px;
  }

  .solution-item {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    padding: 64px 0;
  }

  .article__media {
    margin-top: 40px;
  }

  .related-list__inside {
    flex-direction: row;
    align-items: baseline;
    gap: 32px;
  }

  .footer__about {
    font-size: 13.5px;
  }
}

@media (min-width: 1024px) {
  :root {
    --gutter: 56px;
  }

  .nav {
    display: flex;
  }

  .header__actions .lang {
    display: flex;
  }

  .header__cta {
    display: inline-flex;
  }

  .burger {
    display: none;
  }

  .mobile-menu {
    display: none;
  }

  .header--overlay:not(.is-solid) {
    transform: translateY(-100%);
    opacity: 0;
  }

  .hero__index {
    display: flex;
  }

  .hero__bars {
    display: flex;
  }

  .biz-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .steps {
    grid-template-columns: repeat(6, 1fr);
  }

  .step__rule {
    display: block;
  }

  .adv-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .split {
    grid-template-columns: repeat(2, 1fr);
    gap: 64px;
  }

  .product-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 56px;
  }

  .product-row--alt .product-row__media {
    order: 2;
  }

  .intro-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 32px;
  }

  .intro-grid__body {
    grid-column: 2;
  }

  .case-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .case-grid {
    grid-template-columns: repeat(12, 1fr);
  }

  .case-card--a {
    grid-column: span 7;
  }

  .case-card--b {
    grid-column: span 5;
  }

  /* 首行两张大图等高，避免因列宽不同造成错位 */
  .case-card--a .case-card__media,
  .case-card--b .case-card__media {
    aspect-ratio: auto;
    height: 440px;
  }

  .case-card--c {
    grid-column: span 4;
  }

  .page-hero__title {
    max-width: 900px;
  }
}

@media (min-width: 1280px) {
  .hero__body {
    padding-bottom: 140px;
  }

  .hero__lead {
    font-size: 16px;
  }
}