:root {
  color-scheme: light;
  --color-ink: #111318;
  --color-ink-soft: #303641;
  --color-muted: #5c6470;
  --color-subtle: #858e9b;
  --color-bg: #f6f7f9;
  --color-surface: #ffffff;
  --color-surface-soft: #eff2f6;
  --color-border: #dde1e7;
  --color-border-strong: #c8ced8;
  --color-blue: #1d5dff;
  --color-blue-dark: #164ad0;
  --color-blue-soft: #e9efff;
  --color-dark: #10131a;
  --color-dark-soft: #171b24;
  --color-dark-border: #2a303c;
  --color-white: #ffffff;
  --shadow-sm: 0 8px 28px rgba(20, 29, 47, 0.07);
  --shadow-md: 0 22px 70px rgba(18, 29, 53, 0.12);
  --radius-sm: 14px;
  --radius-md: 22px;
  --radius-lg: 32px;
  --content-width: 1180px;
  --header-height: 76px;
  --font-sans: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  background: var(--color-bg);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(29, 93, 255, 0.2);
  color: var(--color-ink);
}

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

h1,
h2,
h3 {
  color: var(--color-ink);
  font-weight: 750;
  text-wrap: balance;
}

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

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

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

.icon {
  flex: 0 0 auto;
}

a,
summary {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-blue);
  outline-offset: 4px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 1000;
  padding: 11px 16px;
  border-radius: 10px;
  background: var(--color-ink);
  color: var(--color-white);
  font-weight: 700;
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.section-shell {
  width: min(calc(100% - 48px), var(--content-width));
  margin-inline: auto;
}

.page-section {
  padding-block: clamp(88px, 9vw, 136px);
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.section-kicker {
  margin-bottom: 18px;
  color: var(--color-blue);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.65fr);
  gap: clamp(32px, 7vw, 96px);
  align-items: end;
  margin-bottom: clamp(42px, 5vw, 68px);
}

.section-heading h2,
.about-intro h2,
.contact-heading h2 {
  margin-bottom: 0;
  font-size: clamp(2.3rem, 4.5vw, 4.7rem);
  line-height: 1.06;
  letter-spacing: -0.055em;
}

.section-heading > p,
.contact-heading > p {
  max-width: 36rem;
  margin-bottom: 4px;
  color: var(--color-muted);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.8;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  border-bottom: 1px solid rgba(202, 208, 219, 0.72);
  background: rgba(246, 247, 249, 0.88);
  backdrop-filter: blur(18px) saturate(140%);
}

.header-inner {
  display: flex;
  width: min(calc(100% - 48px), var(--content-width));
  height: 100%;
  margin-inline: auto;
  align-items: center;
  gap: 30px;
}

.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 12px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  place-items: center;
  overflow: hidden;
  border-radius: 10px;
  background: var(--color-ink);
}

.brand-mark::before {
  width: 15px;
  height: 18px;
  border-radius: 3px 9px 9px 3px;
  background: var(--color-white);
  content: "";
}

.brand-mark span {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 3px;
  background: var(--color-blue);
}

.brand-name {
  white-space: nowrap;
}

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

.desktop-nav a {
  display: grid;
  min-width: 56px;
  min-height: 44px;
  place-items: center;
  border-radius: 10px;
  color: var(--color-muted);
  font-size: 0.94rem;
  font-weight: 650;
  transition: color 180ms ease, background-color 180ms ease;
}

.desktop-nav a:hover {
  background: rgba(255, 255, 255, 0.8);
  color: var(--color-ink);
}

.header-cta {
  display: grid;
  min-height: 44px;
  padding-inline: 18px;
  place-items: center;
  border-radius: 12px;
  background: var(--color-ink);
  color: var(--color-white);
  font-size: 0.92rem;
  font-weight: 720;
  transition: background-color 180ms ease, box-shadow 180ms ease;
}

.header-cta:hover {
  background: var(--color-blue);
  box-shadow: 0 8px 22px rgba(29, 93, 255, 0.22);
}

.mobile-nav {
  display: none;
  margin-left: auto;
}

.mobile-nav summary {
  display: grid;
  min-width: 60px;
  min-height: 44px;
  cursor: pointer;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 11px;
  background: var(--color-surface);
  font-size: 0.9rem;
  font-weight: 700;
  list-style: none;
}

.mobile-nav summary::-webkit-details-marker {
  display: none;
}

.mobile-nav nav {
  position: absolute;
  top: calc(100% + 10px);
  right: 20px;
  left: 20px;
  display: grid;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.mobile-nav nav a {
  display: flex;
  min-height: 48px;
  padding-inline: 14px;
  align-items: center;
  border-radius: 10px;
  font-weight: 680;
}

.mobile-nav nav a:hover,
.mobile-nav nav a:focus-visible {
  background: var(--color-surface-soft);
}

/* 首屏 */
.hero {
  position: relative;
  display: grid;
  min-height: calc(100svh - var(--header-height));
  padding-block: clamp(64px, 8vw, 112px);
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.82fr);
  gap: clamp(48px, 7vw, 104px);
  align-items: center;
}

.hero::before {
  position: absolute;
  top: 7%;
  left: -18%;
  z-index: -1;
  width: 52vw;
  height: 52vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(29, 93, 255, 0.08), rgba(29, 93, 255, 0) 68%);
  content: "";
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero h1 {
  max-width: 790px;
  margin-bottom: 30px;
  font-size: clamp(3rem, 6.25vw, 6.35rem);
  line-height: 1.02;
  letter-spacing: -0.072em;
}

.hero h1 span {
  color: var(--color-blue);
}

.hero-description {
  max-width: 42rem;
  margin-bottom: 32px;
  color: var(--color-muted);
  font-size: clamp(1.05rem, 1.65vw, 1.24rem);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 52px;
  padding: 0 22px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-weight: 730;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.button-primary {
  background: var(--color-ink);
  color: var(--color-white);
  box-shadow: 0 10px 26px rgba(17, 19, 24, 0.15);
}

.button-primary:hover {
  background: var(--color-blue);
  box-shadow: 0 12px 28px rgba(29, 93, 255, 0.24);
}

.button-secondary {
  border-color: var(--color-border-strong);
  background: rgba(255, 255, 255, 0.7);
  color: var(--color-ink);
}

.button-secondary:hover {
  border-color: var(--color-ink);
  background: var(--color-surface);
}

.hero-points {
  display: flex;
  margin-top: 34px;
  flex-wrap: wrap;
  gap: 10px 24px;
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 630;
}

.hero-points li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.hero-points li span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-blue);
  box-shadow: 0 0 0 4px rgba(29, 93, 255, 0.1);
}

.hero-visual {
  position: relative;
  min-height: 540px;
  isolation: isolate;
}

.hero-visual::before {
  position: absolute;
  inset: 20px -50px 0 -30px;
  z-index: -3;
  border-radius: 48% 52% 46% 54%;
  background:
    linear-gradient(rgba(29, 93, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 93, 255, 0.07) 1px, transparent 1px),
    radial-gradient(circle at 50% 45%, rgba(29, 93, 255, 0.2), rgba(29, 93, 255, 0) 68%);
  background-size: 28px 28px, 28px 28px, auto;
  content: "";
  mask-image: radial-gradient(circle at center, #000 25%, transparent 74%);
}

.hero-card {
  position: absolute;
  border: 1px solid rgba(207, 214, 225, 0.9);
  background: rgba(255, 255, 255, 0.93);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
}

.hero-card-main {
  top: 50%;
  right: 0;
  width: min(100%, 470px);
  padding: 28px;
  border-radius: 28px;
  transform: translateY(-55%);
}

.hero-card-heading {
  display: flex;
  margin-bottom: 24px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  font-weight: 760;
}

.live-mark {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-muted);
  font-size: 0.76rem;
  font-weight: 650;
}

.live-mark i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #1f9d63;
  box-shadow: 0 0 0 4px rgba(31, 157, 99, 0.12);
}

.delivery-steps {
  display: grid;
  gap: 10px;
}

.delivery-steps li {
  display: grid;
  min-height: 82px;
  padding: 14px 16px;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  border: 1px solid #e6e9ee;
  border-radius: 17px;
  background: #fafbfc;
}

.step-number {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 11px;
  background: var(--color-blue-soft);
  color: var(--color-blue);
  font-size: 0.76rem;
  font-weight: 800;
}

.delivery-steps strong,
.delivery-steps small {
  display: block;
}

.delivery-steps strong {
  margin-bottom: 2px;
  font-size: 0.95rem;
}

.delivery-steps small {
  color: var(--color-subtle);
  font-size: 0.78rem;
}

.step-state {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--color-surface-soft);
  color: var(--color-muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.hero-card-note {
  right: 22px;
  bottom: 7px;
  display: grid;
  width: min(86%, 390px);
  padding: 17px 20px;
  grid-template-columns: 38px 1fr;
  align-items: center;
  gap: 13px;
  border-radius: 18px;
}

.note-icon {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 11px;
  background: var(--color-blue);
  color: var(--color-white);
}

.hero-card-note strong,
.hero-card-note small {
  display: block;
}

.hero-card-note strong {
  margin-bottom: 2px;
  font-size: 0.83rem;
}

.hero-card-note small {
  color: var(--color-muted);
  font-size: 0.72rem;
}

.hero-orbit {
  position: absolute;
  z-index: -1;
  border: 1px solid rgba(29, 93, 255, 0.2);
  border-radius: 50%;
}

.hero-orbit-one {
  top: 2%;
  right: -18%;
  width: 400px;
  height: 400px;
}

.hero-orbit-two {
  bottom: 6%;
  left: 0;
  width: 220px;
  height: 220px;
}

/* 业务 */
.services {
  position: relative;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.service-card {
  min-height: 330px;
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.service-card:hover {
  border-color: #b7c2d2;
  box-shadow: var(--shadow-sm);
}

.service-card-top {
  display: flex;
  margin-bottom: clamp(66px, 7vw, 96px);
  align-items: flex-start;
  justify-content: space-between;
}

.service-icon {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 15px;
  background: var(--color-blue-soft);
  color: var(--color-blue);
}

.service-index {
  color: #a0a7b2;
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.08em;
}

.service-card h3 {
  margin-bottom: 14px;
  font-size: clamp(1.35rem, 2vw, 1.65rem);
  line-height: 1.25;
  letter-spacing: -0.035em;
}

.service-card p {
  margin-bottom: 0;
  color: var(--color-muted);
  line-height: 1.82;
}

/* 项目 */
.projects {
  background:
    radial-gradient(circle at 5% 40%, rgba(29, 93, 255, 0.055), transparent 27%),
    var(--color-bg);
}

.project-list {
  display: grid;
  gap: 28px;
}

.project-showcase {
  display: grid;
  overflow: hidden;
  grid-template-columns: minmax(0, 1.08fr) minmax(390px, 0.92fr);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: 0 24px 80px rgba(27, 41, 68, 0.08);
}

.project-preview {
  position: relative;
  min-height: 610px;
  overflow: hidden;
  padding: clamp(34px, 5vw, 64px);
  background:
    radial-gradient(circle at 15% 5%, rgba(255, 255, 255, 0.22), transparent 28%),
    linear-gradient(145deg, #1547ca 0%, #1d5dff 48%, #6891ff 100%);
}

.project-preview::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  content: "";
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 92%);
}

.preview-window {
  position: relative;
  z-index: 1;
  width: min(100%, 650px);
  margin-inline: auto;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 22px;
  background: #f8fafc;
  box-shadow: 0 32px 70px rgba(5, 22, 77, 0.35);
}

.preview-toolbar {
  display: flex;
  height: 64px;
  padding-inline: 19px;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid #e5e9ef;
  background: #ffffff;
}

.preview-logo {
  width: 24px;
  height: 24px;
  border-radius: 8px;
  background: var(--color-blue);
  box-shadow: inset 0 0 0 7px #fff;
}

.preview-title {
  overflow: hidden;
  color: #1b2230;
  font-size: 0.78rem;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-theme {
  width: 29px;
  height: 18px;
  margin-left: auto;
  border-radius: 999px;
  background: #dce2eb;
}

.preview-theme::after {
  display: block;
  width: 12px;
  height: 12px;
  margin: 3px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  content: "";
}

.preview-layout {
  display: grid;
  min-height: 340px;
  grid-template-columns: 128px 1fr;
}

.preview-sidebar {
  display: flex;
  padding: 20px 14px;
  flex-direction: column;
  gap: 14px;
  border-right: 1px solid #e8ebf0;
  background: #fbfcfd;
}

.preview-search {
  height: 28px;
  margin-bottom: 6px;
  border: 1px solid #dfe4eb;
  border-radius: 8px;
  background: #fff;
}

.preview-nav {
  width: 88%;
  height: 9px;
  border-radius: 999px;
  background: #dce2eb;
}

.preview-nav.is-active {
  height: 28px;
  width: 100%;
  background: var(--color-blue-soft);
  box-shadow: inset 4px 0 var(--color-blue);
}

.preview-nav.is-short {
  width: 64%;
}

.preview-content {
  padding: 26px 22px;
}

.preview-heading {
  margin-bottom: 22px;
}

.preview-heading span {
  display: block;
  width: 45%;
  height: 13px;
  margin-bottom: 10px;
  border-radius: 999px;
  background: #202737;
}

.preview-heading span + span {
  width: 72%;
  height: 8px;
  background: #cbd2dc;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.preview-card {
  min-height: 114px;
  padding: 14px;
  border: 1px solid #e0e5eb;
  border-radius: 13px;
  background: #fff;
}

.preview-card i {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 13px;
  place-items: center;
  border-radius: 10px;
  background: #edf1f6;
}

.preview-card i::after {
  width: 15px;
  height: 9px;
  border: 2px solid #8d98a8;
  border-radius: 4px;
  content: "";
}

.preview-card b,
.preview-card em {
  display: block;
  height: 7px;
  border-radius: 99px;
  background: #cfd6df;
}

.preview-card b {
  width: 60%;
  margin-bottom: 8px;
  background: #5d6879;
}

.preview-card em {
  width: 86%;
}

.preview-card.accent {
  border-color: #b8cbff;
  background: #f5f8ff;
}

.preview-card.accent i {
  background: var(--color-blue);
}

.preview-card.accent i::after {
  border-color: #fff;
}

.preview-caption {
  position: relative;
  z-index: 1;
  display: flex;
  margin-top: 28px;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.preview-caption span {
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  background: rgba(8, 34, 104, 0.22);
  color: rgba(255, 255, 255, 0.94);
  font-size: 0.75rem;
  font-weight: 650;
  backdrop-filter: blur(8px);
}

.project-copy {
  display: flex;
  min-width: 0;
  padding: clamp(36px, 5.5vw, 68px);
  flex-direction: column;
}

.project-meta {
  display: flex;
  margin-bottom: 24px;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  color: var(--color-blue);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.04em;
}

.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  letter-spacing: 0;
}

.status-dot::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #1f9d63;
  box-shadow: 0 0 0 4px rgba(31, 157, 99, 0.1);
  content: "";
}

.project-copy h3 {
  margin-bottom: 24px;
  font-size: clamp(2rem, 3.5vw, 3.45rem);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.project-summary {
  margin-bottom: 27px;
  color: var(--color-muted);
  font-size: 1.02rem;
  line-height: 1.85;
}

.project-highlights {
  display: grid;
  margin-bottom: 38px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 11px 16px;
}

.project-highlights li {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 9px;
  color: var(--color-ink-soft);
  font-size: 0.9rem;
  font-weight: 650;
}

.project-highlights .icon {
  color: var(--color-blue);
}

.project-footer {
  display: flex;
  margin-top: auto;
  padding-top: 26px;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  border-top: 1px solid var(--color-border);
}

.technology-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.technology-list li {
  padding: 6px 9px;
  border-radius: 8px;
  background: var(--color-surface-soft);
  color: var(--color-muted);
  font-size: 0.7rem;
  font-weight: 650;
}

.project-link {
  display: inline-flex;
  min-height: 46px;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  color: var(--color-blue);
  font-size: 0.9rem;
  font-weight: 760;
  transition: color 180ms ease;
}

.project-link:hover {
  color: var(--color-blue-dark);
}

/* 关于 */
.about {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(460px, 1.15fr);
  gap: clamp(56px, 10vw, 144px);
  align-items: start;
}

.about-intro {
  position: sticky;
  top: calc(var(--header-height) + 42px);
}

.about-intro h2 {
  margin-bottom: 30px;
}

.about-intro > p:last-child {
  max-width: 38rem;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.85;
}

.principle-list {
  border-top: 1px solid var(--color-border);
}

.principle-list li {
  display: grid;
  min-height: 180px;
  padding-block: 38px;
  grid-template-columns: 54px 1fr;
  gap: 26px;
  border-bottom: 1px solid var(--color-border);
}

.principle-number {
  color: var(--color-blue);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.07em;
}

.principle-list h3 {
  margin-bottom: 12px;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.04em;
}

.principle-list p {
  max-width: 34rem;
  margin-bottom: 0;
  color: var(--color-muted);
  line-height: 1.8;
}

/* 联系 */
.contact {
  position: relative;
  overflow: hidden;
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.72);
}

.contact::before {
  position: absolute;
  top: -320px;
  right: -220px;
  width: 720px;
  height: 720px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(29, 93, 255, 0.3), transparent 67%);
  content: "";
  pointer-events: none;
}

.contact .section-shell {
  position: relative;
  z-index: 1;
}

.contact .section-kicker {
  color: #83a5ff;
}

.contact-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.68fr);
  gap: clamp(36px, 8vw, 112px);
  align-items: end;
  margin-bottom: clamp(48px, 6vw, 76px);
}

.contact-heading h2 {
  max-width: 800px;
  color: var(--color-white);
}

.contact-heading > p {
  color: rgba(255, 255, 255, 0.62);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.contact-card {
  display: grid;
  min-height: 132px;
  padding: 20px;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  border: 1px solid var(--color-dark-border);
  border-radius: 17px;
  background: var(--color-dark-soft);
}

.contact-card.is-linked {
  transition: border-color 180ms ease, background-color 180ms ease;
}

.contact-card.is-linked:hover {
  border-color: #5278dc;
  background: #1a2132;
}

.contact-icon {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  color: #91aeff;
}

.contact-copy {
  min-width: 0;
}

.contact-copy strong,
.contact-copy small {
  display: block;
}

.contact-copy strong {
  margin-bottom: 4px;
  color: var(--color-white);
  font-size: 1rem;
}

.contact-copy small {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.78rem;
  line-height: 1.45;
}

.pending-label {
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.contact-note {
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--color-dark-border);
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.5);
}

.footer-inner {
  display: grid;
  min-height: 124px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  font-size: 0.78rem;
}

.footer-brand {
  justify-self: start;
  color: rgba(255, 255, 255, 0.85);
}

.footer-brand .brand-mark {
  background: rgba(255, 255, 255, 0.12);
}

.footer-inner p {
  margin-bottom: 0;
  text-align: center;
}

.footer-inner > a:last-child {
  display: grid;
  min-height: 44px;
  justify-self: end;
  place-items: center;
  color: rgba(255, 255, 255, 0.72);
  font-weight: 650;
}

.footer-inner > a:last-child:hover {
  color: var(--color-white);
}

/* 404 */
.not-found {
  position: relative;
  display: grid;
  min-height: 100svh;
  padding: 32px;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(29, 93, 255, 0.13), transparent 32%),
    var(--color-bg);
}

.not-found-card {
  position: relative;
  z-index: 2;
  width: min(100%, 680px);
  padding: clamp(34px, 6vw, 70px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-md);
}

.not-found-card .brand {
  margin-bottom: 70px;
}

.error-code {
  margin-bottom: 10px;
  color: var(--color-blue);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.not-found-card h1 {
  margin-bottom: 20px;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.not-found-card > p:not(.error-code) {
  max-width: 32rem;
  margin-bottom: 32px;
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.not-found-decoration span {
  position: absolute;
  z-index: 0;
  border: 1px solid rgba(29, 93, 255, 0.18);
  border-radius: 50%;
}

.not-found-decoration span:nth-child(1) {
  top: -260px;
  right: -180px;
  width: 620px;
  height: 620px;
}

.not-found-decoration span:nth-child(2) {
  right: 12%;
  bottom: -210px;
  width: 440px;
  height: 440px;
}

.not-found-decoration span:nth-child(3) {
  bottom: 8%;
  left: -120px;
  width: 300px;
  height: 300px;
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(380px, 0.78fr);
    gap: 44px;
  }

  .hero h1 {
    font-size: clamp(3rem, 7vw, 5.2rem);
  }

  .project-showcase {
    grid-template-columns: 1fr;
  }

  .project-preview {
    min-height: 570px;
  }

  .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .hero {
    min-height: auto;
    padding-top: 82px;
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 760px;
  }

  .hero-visual {
    width: min(100%, 620px);
    min-height: 520px;
    margin-inline: auto;
  }

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

  .service-card {
    display: grid;
    min-height: 0;
    grid-template-columns: 80px 1fr;
    column-gap: 24px;
  }

  .service-card-top {
    margin-bottom: 0;
    grid-row: 1 / span 2;
    flex-direction: column;
    justify-content: flex-start;
    gap: 24px;
  }

  .service-card h3 {
    margin: 2px 0 10px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .about-intro {
    position: static;
  }

  .contact-heading {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 68px;
  }

  .section-shell,
  .header-inner {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .page-section {
    padding-block: 80px;
  }

  .desktop-nav,
  .header-cta {
    display: none;
  }

  .mobile-nav {
    display: block;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .section-heading h2,
  .about-intro h2,
  .contact-heading h2 {
    font-size: clamp(2.3rem, 11vw, 3.5rem);
  }

  .hero {
    padding-block: 64px 76px;
  }

  .hero h1 {
    font-size: clamp(2.8rem, 13vw, 4.25rem);
    letter-spacing: -0.066em;
  }

  .hero-description {
    font-size: 1.02rem;
  }

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

  .hero-visual {
    min-height: 480px;
  }

  .hero-card-main {
    padding: 20px;
  }

  .hero-card-note {
    right: 0;
    width: 91%;
  }

  .delivery-steps li {
    min-height: 76px;
    grid-template-columns: 36px minmax(0, 1fr);
  }

  .step-state {
    display: none;
  }

  .project-showcase {
    border-radius: 24px;
  }

  .project-preview {
    min-height: 490px;
    padding: 28px 20px;
  }

  .preview-layout {
    grid-template-columns: 90px 1fr;
  }

  .preview-sidebar {
    padding-inline: 10px;
  }

  .preview-content {
    padding: 22px 14px;
  }

  .preview-card {
    min-height: 104px;
    padding: 11px;
  }

  .project-copy {
    padding: 34px 26px 30px;
  }

  .project-highlights {
    grid-template-columns: 1fr;
  }

  .project-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .project-link {
    min-width: 100%;
    justify-content: space-between;
  }

  .principle-list li {
    min-height: 0;
    grid-template-columns: 42px 1fr;
    gap: 12px;
  }

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

  .contact-card {
    min-height: 104px;
  }

  .footer-inner {
    padding-block: 34px;
    grid-template-columns: 1fr auto;
  }

  .footer-inner p {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: start;
    text-align: left;
  }
}

@media (max-width: 480px) {
  .brand-name {
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

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

  .hero-points {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-visual {
    min-height: 440px;
  }

  .hero-card-main {
    transform: translateY(-58%);
  }

  .hero-card-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .hero-card-note {
    padding: 14px;
  }

  .service-card {
    display: block;
  }

  .service-card-top {
    margin-bottom: 38px;
    align-items: flex-start;
    flex-direction: row;
    justify-content: space-between;
  }

  .project-preview {
    min-height: 430px;
  }

  .preview-toolbar {
    height: 52px;
  }

  .preview-layout {
    min-height: 285px;
    grid-template-columns: 72px 1fr;
  }

  .preview-sidebar {
    gap: 12px;
  }

  .preview-search {
    height: 24px;
  }

  .preview-grid {
    gap: 8px;
  }

  .preview-card {
    min-height: 93px;
  }

  .preview-card i {
    width: 27px;
    height: 27px;
    margin-bottom: 10px;
  }

  .preview-caption span:last-child {
    display: none;
  }

  .pending-label {
    font-size: 0;
  }

  .pending-label::after {
    font-size: 0.65rem;
    content: "待开放";
  }

  .not-found {
    padding: 16px;
  }

  .not-found-card .brand {
    margin-bottom: 52px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (forced-colors: active) {
  .brand-mark,
  .service-icon,
  .note-icon,
  .step-number,
  .contact-icon {
    border: 1px solid CanvasText;
  }

  .hero-points li span,
  .live-mark i,
  .status-dot::before {
    forced-color-adjust: none;
    background: Highlight;
  }
}