/* ==========================================================================
   八荒智驱 · 设计系统
   深色石墨单一中性体系 + 精准青色强调（DESIGN.md §4 / §5 / §6）
   ========================================================================== */

:root {
  /* 色彩令牌 */
  --canvas: #0b0f12;
  --surface: #11171b;
  --panel: #172027;
  --panel-2: #1c262e;
  --line: #26313a;
  --text: #e8eef2;
  --steel: #a6b0b8;
  --muted: #697781;
  --accent: #35b8a6;
  --accent-strong: #46cbb8;
  --accent-ink: #06211d;
  --wash: rgba(53, 184, 166, 0.1);
  --wash-2: rgba(53, 184, 166, 0.16);
  --hairline: rgba(53, 184, 166, 0.34);
  --amber: #d6a84f;

  /* 排版令牌 */
  --font-display: "Outfit", "Satoshi", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Outfit", "Satoshi", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* 尺度令牌 */
  --max: 1400px;
  --gutter: clamp(2rem, 6vw, 7rem);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;

  /* 动效令牌 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --fast: 200ms var(--ease);
  --normal: 300ms var(--ease);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  overflow-x: hidden;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--canvas);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: linear-gradient(to bottom, black, transparent 42%);
}

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

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

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  max-width: 14ch;
  margin-bottom: 1.4rem;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 5.6vw, 5.4rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.2vw, 3.5rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
  text-wrap: balance;
}

h3 {
  margin-bottom: 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 1.8vw, 1.5rem);
  font-weight: 600;
  line-height: 1.25;
  text-wrap: balance;
}

h4 {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.icon {
  width: 1.05em;
  height: 1.05em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  transition: top var(--fast);
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.section-shell {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - var(--gutter)));
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-lede,
.section-heading p,
.about-copy p,
.contact-head p {
  max-width: 62ch;
  color: var(--steel);
  font-size: clamp(1rem, 1.2vw, 1.125rem);
}

/* ============================ 顶部导航 ============================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 76px;
  padding: 0 clamp(1rem, 4vw, 3.5rem);
  border-bottom: 1px solid transparent;
  background: rgba(11, 15, 18, 0.72);
  backdrop-filter: blur(18px);
  transition: background var(--normal), border-color var(--normal);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(11, 15, 18, 0.94);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-width: max-content;
}

.brand-mark {
  display: block;
  height: 44px;
  width: auto;
  filter: drop-shadow(0 6px 20px rgba(53, 184, 166, 0.22));
}

.brand-text strong,
.brand-text small {
  display: block;
}

.brand-text strong {
  font-size: 1rem;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.brand-text small {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(0.5rem, 1.6vw, 1.35rem);
  color: var(--steel);
  font-size: 0.92rem;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.25rem;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
  transition: color var(--fast);
}

.nav-link::after {
  position: absolute;
  left: 0.25rem;
  right: 0.25rem;
  bottom: 8px;
  height: 1px;
  width: 0;
  content: "";
  background: var(--accent);
  transition: width var(--fast);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-current {
  color: var(--text);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link.is-current::after {
  width: calc(100% - 0.5rem);
}

.caret {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 0.45rem;
  margin-bottom: 3px;
  border-right: 1.4px solid currentColor;
  border-bottom: 1.4px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--fast);
}

.nav-item {
  position: relative;
  display: inline-flex;
}

.nav-item.is-open .caret {
  transform: rotate(-135deg);
  margin-bottom: -3px;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 1.1rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 600;
  transition: background var(--fast), border-color var(--fast), color var(--fast);
}

.nav-cta:hover {
  border-color: var(--accent);
  background: var(--wash);
  color: var(--accent-strong);
}

/* Mega 菜单 */
.mega {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  z-index: 60;
  width: min(700px, 90vw);
  padding: 1.4rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(17, 23, 27, 0.98);
  box-shadow: 0 34px 70px rgba(0, 0, 0, 0.55);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 10px);
  transition: opacity var(--fast), transform var(--fast), visibility var(--fast);
}

.nav-item.is-open > .mega {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

@media (hover: hover) {
  .nav-item:hover > .mega {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
  }
}

.mega-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.mega-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.75rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
}

.mega-title .icon {
  color: var(--accent);
}

.mega-col a {
  display: block;
  padding: 0.36rem 0;
  color: var(--steel);
  font-size: 0.9rem;
  transition: color var(--fast), padding-left var(--fast);
}

.mega-col a:hover {
  color: var(--accent-strong);
  padding-left: 0.25rem;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 5px auto;
  background: var(--text);
  transition: transform var(--fast);
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* ============================== Hero ============================== */

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  min-height: 100dvh;
  padding-top: 138px;
  padding-bottom: 5rem;
}

.stage-grid {
  position: absolute;
  left: 44%;
  bottom: 3rem;
  z-index: -1;
  width: min(60vw, 820px);
  height: 20vw;
  transform: translateX(-8%) perspective(760px) rotateX(64deg);
  transform-origin: bottom;
  background-image:
    linear-gradient(rgba(53, 184, 166, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 184, 166, 0.16) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.5;
  mask-image: radial-gradient(closest-side, black, transparent 92%);
  animation: drift 20s linear infinite;
}

.hero-copy {
  max-width: 40rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0 1.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform var(--fast), background var(--fast), border-color var(--fast), color var(--fast);
}

.button:active {
  transform: translateY(1px);
}

.button.primary {
  color: var(--accent-ink);
  background: var(--accent);
}

.button.primary:hover {
  background: var(--accent-strong);
  transform: translateY(-1px);
}

.button.ghost {
  border-color: var(--line);
  color: var(--text);
  background: transparent;
}

.button.ghost:hover {
  border-color: var(--hairline);
  background: var(--wash);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.hero-tags span {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 0 0.8rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  color: var(--accent-strong);
  background: var(--wash);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.hero-visual {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: repeat(6, 1fr);
  gap: 12px;
  height: clamp(420px, 42vw, 552px);
}

.showcase-card {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0d1013;
}

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

.showcase-card::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(180deg, transparent 40%, rgba(5, 8, 10, 0.86));
}

.showcase-card figcaption {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0.9rem;
  z-index: 1;
}

.showcase-card figcaption span {
  display: block;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.showcase-card figcaption strong {
  display: block;
  font-size: 0.98rem;
  font-weight: 600;
}

.card-main {
  grid-column: 1 / 5;
  grid-row: 1 / 7;
}

.card-top {
  grid-column: 5 / 7;
  grid-row: 1 / 4;
}

.card-bottom {
  grid-column: 5 / 7;
  grid-row: 4 / 7;
}

/* ============================ 数据背书 ============================ */

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.metric {
  padding: clamp(1.5rem, 2.6vw, 2.4rem);
  background: var(--surface);
}

.metric strong {
  display: block;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: clamp(2rem, 3.4vw, 3.4rem);
  font-weight: 500;
  line-height: 1.05;
}

.metric span {
  color: var(--steel);
  font-size: 0.94rem;
}

/* ============================ 通用区块 ============================ */

.products,
.solutions,
.technology,
.about,
.careers {
  padding: clamp(5rem, 8vw, 8rem) 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: clamp(2.25rem, 4.5vw, 3.75rem);
}

.section-heading h2,
.about h2,
.contact h2 {
  margin-bottom: 0;
}

.point-list {
  display: grid;
  gap: 0.5rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
}

.point-list li {
  position: relative;
  padding-left: 1.3rem;
  color: var(--steel);
  font-size: 0.95rem;
}

.point-list li::before {
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  content: "";
  background: var(--accent);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.35rem;
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 0.94rem;
}

.text-link .icon {
  transition: transform var(--fast);
}

.text-link:hover .icon {
  transform: translateX(3px);
}

/* ============================= 产品中心 ============================= */

.product-board {
  display: grid;
  grid-template-columns: minmax(0, 1.14fr) minmax(0, 0.86fr);
  grid-template-rows: auto auto;
  gap: 1rem;
}

.product-feature,
.product-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.product-feature {
  display: flex;
  grid-column: 1 / 2;
  grid-row: 1 / 3;
  flex-direction: column;
}

.product-card {
  display: flex;
  flex-direction: column;
  grid-column: 2 / 3;
}

.product-media {
  margin: 0;
  overflow: hidden;
  background: #0d1013;
}

.product-feature .product-media {
  aspect-ratio: 16 / 11;
}

.product-card .product-media {
  aspect-ratio: 16 / 8;
}

/* 桌面端：产品主卡跨两行，媒体区自适应撑满，避免底部留白 */
@media (min-width: 1101px) {
  .product-feature .product-media {
    flex: 1 1 auto;
    aspect-ratio: auto;
    min-height: 320px;
  }
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 600ms var(--ease);
}

.product-feature:hover .product-media img,
.product-card:hover .product-media img {
  transform: scale(1.03);
}

.product-body {
  padding: clamp(1.4rem, 2.6vw, 2.4rem);
}

.product-lead,
.product-card p {
  color: var(--steel);
}

.spec-list {
  display: grid;
  gap: 0;
  margin: 1.4rem 0 0;
}

.spec-list > div {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.spec-list dt {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.spec-list dd {
  margin: 0;
  color: var(--steel);
  font-size: 0.94rem;
}

/* ============================ 工业影像带 ============================ */

.feature-cinema {
  position: relative;
  display: grid;
  align-items: end;
  min-height: clamp(560px, 82dvh, 820px);
  overflow: hidden;
  background: #050607;
}

.feature-cinema img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.feature-cinema::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(90deg, rgba(5, 8, 10, 0.9), rgba(5, 8, 10, 0.32) 62%, rgba(5, 8, 10, 0.55)),
    linear-gradient(0deg, rgba(5, 8, 10, 0.72), transparent 55%);
}

.feature-copy {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - var(--gutter)));
  margin-inline: auto;
  padding-bottom: clamp(3.5rem, 7vw, 6rem);
}

.feature-copy h2 {
  max-width: none;
}

.feature-copy p:not(.eyebrow) {
  max-width: 52ch;
  color: #c6d0d6;
}

.feature-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-top: 2rem;
}

.feature-stats div strong {
  display: block;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
}

.feature-stats div span {
  color: var(--steel);
  font-size: 0.9rem;
}

/* ============================ 解决方案 ============================ */

.solutions-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.6fr) minmax(0, 1.4fr);
  gap: 1rem;
}

.scene-nav {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.scene-tab {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--steel);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--fast), background var(--fast);
}

.scene-tab strong {
  color: var(--text);
  font-weight: 600;
  font-size: 0.96rem;
}

.scene-tag {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 0 0.55rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.scene-tab:hover {
  border-color: var(--hairline);
}

.scene-tab.is-active {
  border-color: var(--accent);
  background: var(--wash);
}

.scene-tab.is-active strong {
  color: var(--accent-strong);
}

.scene-panels {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.scene-panel {
  display: none;
}

.scene-panel.is-active {
  display: block;
  animation: fade-up 320ms var(--ease);
}

.scene-panel h3 {
  margin-bottom: 1.25rem;
}

.scene-flow {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--line);
}

.scene-flow > div {
  padding: 1.1rem 1.25rem;
  background: var(--surface);
}

.scene-flow span {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
}

.scene-flow p {
  margin: 0;
  color: var(--steel);
  font-size: 0.95rem;
}

.solution-focus {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 0;
  margin-top: 1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.solution-focus-media {
  margin: 0;
  overflow: hidden;
  background: #0d1013;
}

.solution-focus-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.solution-focus-body {
  padding: clamp(1.5rem, 3vw, 2.5rem);
}

.solution-focus-body p {
  color: var(--steel);
}

/* ============================ 技术实力 ============================ */

.capability-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.capability-track .node {
  position: relative;
  min-height: 230px;
  padding: clamp(1.1rem, 2vw, 1.6rem);
  border-right: 1px solid var(--line);
}

.capability-track .node:last-child {
  border-right: 0;
}

.capability-track .node::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 2px;
  content: "";
  background: var(--accent);
}

.capability-track .node span {
  display: block;
  margin-bottom: 3.25rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

.capability-track .node h3 {
  font-size: 1.08rem;
}

.capability-track .node p {
  margin: 0;
  color: var(--steel);
  font-size: 0.9rem;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.tech-panel {
  padding: clamp(1.5rem, 3vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.tech-panel > p:not(.eyebrow) {
  color: var(--steel);
}

.foundation-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.foundation-list > div {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.foundation-list .icon {
  display: block;
  margin-bottom: 0.6rem;
  color: var(--accent);
  font-size: 1.3rem;
  width: 1.3rem;
  height: 1.3rem;
}

.foundation-list strong {
  display: block;
  font-size: 0.98rem;
}

.foundation-list span {
  color: var(--muted);
  font-size: 0.86rem;
}

.loop-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: loop;
}

.loop-strip li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
}

.loop-strip li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.advantages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.advantages > div {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.advantages .icon {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--accent);
  font-size: 1.4rem;
  width: 1.4rem;
  height: 1.4rem;
}

.advantages strong {
  display: block;
  font-size: 1.02rem;
}

.advantages span {
  color: var(--steel);
  font-size: 0.88rem;
}

/* ============================ 关于我们 ============================ */

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 1rem;
  align-items: start;
}

.about-copy {
  padding: clamp(2rem, 4vw, 3.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, var(--wash), transparent 46%),
    var(--panel);
}

.about-copy p + p {
  margin-top: 1rem;
}

.beliefs {
  display: grid;
  gap: 1rem;
}

.beliefs > div {
  padding: 1.4rem 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.beliefs .icon {
  color: var(--accent);
  font-size: 1.25rem;
  width: 1.25rem;
  height: 1.25rem;
  margin-bottom: 0.6rem;
}

.beliefs strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 1.1rem;
}

.beliefs span {
  color: var(--steel);
  font-size: 0.92rem;
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.about-facts > div {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.about-facts p {
  margin: 0;
  color: var(--steel);
  font-size: 0.92rem;
}

/* ============================ 人才招聘 ============================ */

.job-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.job {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: clamp(1.4rem, 2.4vw, 1.9rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.job-tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  margin-bottom: 0.85rem;
  padding: 0 0.6rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  color: var(--accent);
  background: var(--wash);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.job-head h3 {
  margin-bottom: 0.5rem;
}

.job-head p {
  margin: 0;
  color: var(--steel);
  font-size: 0.93rem;
}

.job-detail {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.job-detail summary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.job-detail summary::-webkit-details-marker {
  display: none;
}

.job-detail summary::after {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 1.4px solid currentColor;
  border-bottom: 1.4px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--fast);
}

.job-detail[open] summary::after {
  transform: rotate(-135deg);
}

.job-detail-body {
  margin-top: 1rem;
}

.job-detail-body h4 {
  margin-top: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.job-detail-body ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--steel);
  font-size: 0.9rem;
}

.job-detail-body li {
  margin-bottom: 0.35rem;
}

.benefits {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.benefits > div {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.benefits .icon {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--accent);
  font-size: 1.3rem;
  width: 1.3rem;
  height: 1.3rem;
}

.benefits strong {
  display: block;
  font-size: 1rem;
}

.benefits span {
  color: var(--steel);
  font-size: 0.87rem;
}

.careers-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding: clamp(1.4rem, 3vw, 2rem) clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.careers-cta p {
  margin: 0;
  color: var(--steel);
}

/* ============================ 合作咨询 ============================ */

.contact {
  margin-bottom: 5rem;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3.5rem);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(53, 184, 166, 0.14), transparent 48%),
    var(--panel);
}

.contact-head p {
  margin-bottom: 0;
}

.contact-modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

.contact-modes > div {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 15, 18, 0.5);
}

.contact-modes .icon {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--accent);
  font-size: 1.35rem;
  width: 1.35rem;
  height: 1.35rem;
}

.contact-modes strong {
  display: block;
  font-size: 1.02rem;
}

.contact-modes span {
  color: var(--steel);
  font-size: 0.88rem;
}

.contact-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-info li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--steel);
  font-size: 0.94rem;
}

.contact-info .icon {
  color: var(--accent);
}

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

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

.footer {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 1.5fr);
  gap: 2rem 3rem;
  padding: 3.5rem clamp(1rem, 4vw, 3.5rem) 2rem;
  border-top: 1px solid var(--line);
  background: #080c0e;
  color: var(--steel);
}

.footer-brand p {
  margin: 1rem 0 0;
  font-size: 0.9rem;
}

.footer-brand .brand-mark {
  height: 50px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.footer-title {
  margin: 0 0 0.85rem;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.footer-cols a,
.footer-cols span {
  display: block;
  padding: 0.28rem 0;
  color: var(--steel);
  font-size: 0.9rem;
  transition: color var(--fast);
}

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

.footer-bottom {
  display: flex;
  grid-column: 1 / -1;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  margin: 0;
  font-size: 0.86rem;
}

.footer-note {
  grid-column: 1 / -1;
}

.footer-note summary {
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
}

.footer-note p {
  margin: 0.75rem 0 0;
  max-width: 70ch;
  color: var(--muted);
  font-size: 0.82rem;
}

/* ============================ 动效 ============================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}

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

@keyframes drift {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 92px 46px;
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 1100px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 128px;
  }

  .hero-copy {
    max-width: 46rem;
  }

  .hero-visual {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
    height: auto;
  }

  .card-main {
    grid-column: 1 / -1;
    grid-row: auto;
    aspect-ratio: 16 / 9;
  }

  .card-top,
  .card-bottom {
    grid-column: auto;
    grid-row: auto;
    aspect-ratio: 4 / 3;
  }

  .section-heading,
  .product-board,
  .tech-grid,
  .about-layout,
  .solutions-layout {
    grid-template-columns: 1fr;
  }

  .product-feature,
  .product-card {
    grid-column: 1 / -1;
    grid-row: auto;
  }

  .metrics,
  .advantages,
  .benefits,
  .about-facts,
  .job-list,
  .contact-modes {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .capability-track .node {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .solution-focus {
    grid-template-columns: 1fr;
  }

  .solution-focus-media {
    aspect-ratio: 16 / 8;
  }
}

@media (max-width: 860px) {
  .site-header {
    height: 68px;
  }

  .menu-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    left: 1rem;
    right: 1rem;
    top: 70px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100dvh - 88px);
    overflow-y: auto;
    padding: 0.75rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #0b0f12;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.6);
  }

  .nav.is-open {
    display: flex;
  }

  .nav-item {
    display: block;
  }

  .nav-link {
    width: 100%;
    justify-content: space-between;
    padding: 0.7rem 0.6rem;
    border-bottom: 1px solid var(--line);
  }

  .nav-link::after {
    display: none;
  }

  .nav-cta {
    justify-content: center;
    margin-top: 0.75rem;
  }

  .mega {
    position: static;
    width: auto;
    min-width: 0;
    padding: 0.4rem 0.6rem 0.6rem;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }

  .nav-item.is-open .mega {
    display: block;
    animation: fade-up 220ms var(--ease);
  }

  .mega-inner {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .section-shell {
    width: min(100% - 2rem, var(--max));
  }

  .scene-flow {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 14ch;
  }
}

@media (max-width: 620px) {
  .metrics,
  .advantages,
  .benefits,
  .about-facts,
  .job-list,
  .contact-modes,
  .capability-track,
  .foundation-list,
  .footer-cols {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    grid-template-columns: 1fr;
  }

  .card-top,
  .card-bottom {
    grid-column: 1 / -1;
    aspect-ratio: 16 / 9;
  }

  .feature-stats {
    gap: 1.5rem;
  }

  .careers-cta,
  .contact-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .careers-cta .button,
  .contact-actions .button {
    width: 100%;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

/* ============================ 语言切换 ============================ */

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.lang-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(53, 184, 166, 0.08);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.36rem 0.62rem;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color var(--fast), background var(--fast);
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
  border-color: var(--accent);
  background: rgba(53, 184, 166, 0.16);
  outline: none;
}

/* ============================ 图片科技感覆盖层 ============================ */

.product-media,
.solution-focus-media,
.feature-cinema {
  position: relative;
  overflow: hidden;
}

.showcase-card figcaption {
  z-index: 3;
}

.tech-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.9;
  background:
    radial-gradient(130% 95% at 88% -8%, rgba(53, 184, 166, 0.22), transparent 55%),
    repeating-linear-gradient(0deg, rgba(53, 184, 166, 0.05) 0 1px, transparent 1px 30px),
    repeating-linear-gradient(90deg, rgba(53, 184, 166, 0.05) 0 1px, transparent 1px 30px);
}

.tech-overlay::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(53, 184, 166, 0.30);
  border-radius: 8px;
}

.tech-overlay::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 8px;
  background:
    linear-gradient(var(--accent), var(--accent)) left top / 16px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) left top / 2px 16px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right bottom / 16px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right bottom / 2px 16px no-repeat;
}

.tech-overlay.wide::before {
  inset: 14px;
}

.tech-overlay.wide::after {
  inset: 14px;
  background:
    linear-gradient(var(--accent), var(--accent)) left top / 22px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) left top / 2px 22px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right bottom / 22px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right bottom / 2px 22px no-repeat;
}

.stage-grid .neural {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.85;
}

@keyframes neuralFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.stage-grid .neural {
  animation: neuralFloat 9s ease-in-out infinite;
}

/* ============================ 研发布局 ============================ */

.locations {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.location-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), #10161b);
  padding: 1.6rem 1.5rem 1.4rem;
}

.location-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 100% 0, rgba(53, 184, 166, 0.10), transparent 55%);
  pointer-events: none;
}

.location-head {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.location-head .icon {
  width: 22px;
  height: 22px;
}

.location-city {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

.location-role {
  margin-left: auto;
  font-size: 0.74rem;
  color: var(--steel);
  border: 1px solid var(--line);
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: rgba(53, 184, 166, 0.06);
}

.location-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.25rem;
}

.location-card p {
  position: relative;
  margin: 0 0 1rem;
  color: var(--steel);
  font-size: 0.95rem;
  line-height: 1.6;
}

.location-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  position: relative;
}

.location-points li {
  position: relative;
  padding-left: 1.2rem;
  color: var(--text);
  font-size: 0.9rem;
}

.location-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--accent);
  transform: rotate(45deg);
}

/* ============================ 联合高校 ============================ */

.uni-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
}

.uni-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  margin: 0;
  padding: 1.3rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), #10161b);
  text-align: center;
  transition: border-color var(--fast), transform var(--fast);
}

.uni-logo:hover {
  border-color: var(--uni);
  transform: translateY(-3px);
}

.uni-emblem {
  position: relative;
  width: 100%;
  max-width: 136px;
  height: 92px;
  padding: 12px;
  background: #ffffff;
  border-radius: 14px;
  overflow: hidden;
}

.uni-emblem img,
.uni-emblem svg {
  position: absolute;
  inset: 12px;
  width: calc(100% - 24px);
  height: calc(100% - 24px);
  object-fit: contain;
  display: block;
}

.uni-logo figcaption strong {
  display: block;
  font-size: 0.92rem;
  color: var(--text);
}

.uni-logo figcaption span {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.68rem;
  line-height: 1.3;
  color: var(--muted);
  font-family: var(--font-mono);
}

.uni-note {
  margin-top: 1.2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

/* ============================ 资质与荣誉 ============================ */

.honor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}

.honor-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.8rem;
  min-height: 150px;
  padding: 1.4rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.015);
}

.honor-card.is-placeholder {
  color: var(--muted);
}

.honor-mark {
  width: 38px;
  height: 38px;
  color: var(--accent);
  opacity: 0.6;
}

.honor-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--steel);
}

/* ============================ 英文版式微调 ============================ */

.lang-en .nav-link {
  font-size: 0.86rem;
}

.lang-en .nav-cta {
  font-size: 0.82rem;
}

.lang-en .nav {
  gap: clamp(0.4rem, 1.1vw, 1rem);
}

.lang-en .mega-title {
  font-size: 0.85rem;
}

.lang-en .mega-col a {
  font-size: 0.82rem;
}

.lang-en .brand-text strong {
  font-size: 0.95rem;
}

.lang-en h1 {
  font-size: clamp(2.05rem, 5vw, 3.4rem);
  letter-spacing: -0.01em;
}

.lang-en .eyebrow {
  letter-spacing: 0;
}

.lang-en .hero-actions .button {
  font-size: 0.9rem;
}

/* ============================ 响应式补充 ============================ */

@media (max-width: 1100px) {
  .uni-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 760px) {
  .locations {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 620px) {
  .honor-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== footer contact with icons ===== */
.footer-cols .footer-contact {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0 0 0.55rem;
  color: var(--steel);
  font-size: 0.88rem;
  line-height: 1.55;
}

.footer-cols .footer-contact .icon {
  width: 15px;
  height: 15px;
  flex: none;
  /* (行高 1.55em - 图标 15px) / 2 → 与第一行文字精确居中对齐 */
  margin-top: calc((1.55em - 15px) / 2);
  color: var(--accent);
}

.footer-cols .footer-contact span {
  display: block;
  min-width: 0;
}

/* ===== FAQ (GEO-friendly visible Q&A) ===== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem;
}

.faq-item {
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.faq-item h3 {
  margin: 0 0 0.6rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  text-wrap: balance;
}

.faq-item h3::before {
  content: "Q";
  display: inline-grid;
  width: 1.5rem;
  height: 1.5rem;
  margin-right: 0.6rem;
  place-items: center;
  border-radius: 6px;
  background: var(--wash);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  vertical-align: 0.1em;
}

.faq-item p {
  margin: 0;
  color: var(--steel);
  font-size: 0.9rem;
  line-height: 1.75;
}

@media (max-width: 860px) {
  .faq-grid { grid-template-columns: 1fr; }
}

/* ===== 区块间距（联合高校 / 常见问题） ===== */
.partners,
.faq {
  padding: clamp(5rem, 8vw, 8rem) 0;
}

/* ===== eyebrow 在复合区块内保持强调色（覆盖 .section-heading p 等通配规则） ===== */
.section-heading p.eyebrow,
.about-copy p.eyebrow,
.contact-head p.eyebrow,
.product-body p.eyebrow,
.tech-panel p.eyebrow {
  max-width: none;
  margin-bottom: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ===== 移动端导航项为按钮时的高度一致 ===== */
@media (max-width: 860px) {
  .nav-item .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
}