:root {
  --bg: #ffffff;
  --bg-mute: #f4f4f4;
  --ink: #0a0a0a;
  --ink-2: #3a3a3a;
  --ink-3: #6e6e6e;
  --line: #e6e6e6;
  --line-strong: #0a0a0a;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
  --nav-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

ul, ol {
  list-style: none;
}

/* —— Nav —— */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 64px);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.nav.scrolled {
  border-bottom-color: var(--line);
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(22px, 3vw, 40px);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--ink-2);
}

.nav-links a {
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
}

.nav-links a[aria-current="page"] {
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 1px;
}

.nav-cta {
  padding: 10px 20px !important;
  background: var(--ink);
  color: #fff !important;
  letter-spacing: 0.1em;
  transition: background 0.25s ease, transform 0.25s var(--ease) !important;
  text-decoration: none !important;
}

.nav-cta:hover {
  background: #333 !important;
  transform: translateY(-1px);
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  border: 1px solid var(--ink);
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn-primary:hover {
  background: #333;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

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

.btn-on-dark {
  background: #fff;
  color: var(--ink);
  border-color: #fff;
}

.btn-on-dark:hover {
  background: transparent;
  color: #fff;
}

.btn-ghost-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-ghost-light:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

/* —— Hero —— */
.hero {
  min-height: calc(100svh - var(--nav-h));
  display: grid;
  place-items: center;
  padding: clamp(48px, 10vh, 96px) clamp(20px, 5vw, 64px);
  background: var(--ink);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 40%, rgba(255, 255, 255, 0.03) 100%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 80px,
      rgba(255, 255, 255, 0.015) 80px,
      rgba(255, 255, 255, 0.015) 81px
    );
  pointer-events: none;
  animation: hero-shift 20s linear infinite;
}

@keyframes hero-shift {
  from { transform: translateX(0); }
  to { transform: translateX(80px); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
  width: 100%;
}

.hero-brand {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.28em;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 28px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(56px, 14vw, 112px);
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.05;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.65);
  max-width: 420px;
  margin-bottom: 40px;
  line-height: 1.8;
}

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

/* —— Sections —— */
.section {
  padding: clamp(64px, 10vh, 100px) clamp(20px, 5vw, 64px);
}

.section-mute {
  background: var(--bg-mute);
}

.section-head {
  margin-bottom: 48px;
  max-width: 520px;
}

.section-head .eyebrow {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 12px;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-head p:not(.eyebrow) {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 15px;
}

.section-head a {
  display: inline-block;
  margin-top: 16px;
  font-size: 13px;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: opacity 0.2s ease;
}

.section-head a:hover {
  opacity: 0.5;
}

/* —— 公司简介 —— */
.intro-block {
  max-width: 960px;
}

.intro-copy {
  max-width: 720px;
  margin-bottom: 48px;
}

.intro-copy p {
  color: var(--ink-2);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 18px;
}

.intro-copy p:last-child {
  margin-bottom: 0;
}

.stats-row {
  flex-direction: row !important;
  flex-wrap: wrap;
  gap: clamp(32px, 6vw, 64px) !important;
  border-top: 1px solid var(--line);
  padding-top: 36px;
}

.stats-row li {
  border-bottom: none !important;
  padding-bottom: 0 !important;
}

/* —— 企业愿景 —— */
.vision-grid {
  max-width: 960px;
}

.vision-main {
  max-width: 720px;
  margin-bottom: 48px;
}

.vision-quote {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.5;
  margin-bottom: 20px;
  color: var(--ink);
}

.vision-main > p:not(.vision-quote) {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.9;
}

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

.vision-points li {
  background: var(--bg);
  padding: clamp(28px, 3vw, 36px);
}

.vision-points .num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  margin-bottom: 16px;
}

.vision-points h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.vision-points p {
  font-size: 14px;
  color: var(--ink-3);
  font-weight: 300;
  line-height: 1.75;
}

/* —— Teaser links —— */
.teaser-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.teaser-card {
  background: var(--bg);
  padding: clamp(28px, 4vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 220px;
  transition: background 0.3s ease;
}

.teaser-card:hover {
  background: var(--ink);
  color: #fff;
}

.teaser-card:hover p,
.teaser-card:hover .num {
  color: rgba(255, 255, 255, 0.55);
}

.teaser-card .num {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-3);
}

.teaser-card h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.teaser-card p {
  font-size: 14px;
  color: var(--ink-3);
  font-weight: 300;
  flex: 1;
  line-height: 1.7;
}

.teaser-card .go {
  font-size: 12px;
  letter-spacing: 0.14em;
}

/* —— About —— */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: clamp(40px, 8vw, 80px);
  align-items: end;
  max-width: 1100px;
}

.about-grid h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.35;
  margin-bottom: 16px;
}

.about-grid > div > p {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 15px;
  max-width: 440px;
  line-height: 1.8;
}

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

.stats li {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.stats strong {
  display: block;
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
  margin-bottom: 6px;
}

.stats span {
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
}

/* —— Page hero —— */
.page-hero {
  padding: clamp(56px, 10vh, 88px) clamp(20px, 5vw, 64px) clamp(40px, 6vh, 56px);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 600;
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}

.page-hero p {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 15px;
  max-width: 420px;
  line-height: 1.8;
}

/* —— Apps —— */
.app-list {
  max-width: 960px;
}

.app-row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 24px;
  align-items: start;
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.35s var(--ease);
}

.app-row:first-child {
  border-top: 1px solid var(--line);
}

.app-row:hover {
  padding-left: 12px;
}

.app-row .idx {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  padding-top: 6px;
}

.app-row h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.app-row p {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 14px;
  max-width: 480px;
  line-height: 1.7;
}

.app-row .tag {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  border: 1px solid var(--line);
  padding: 8px 12px;
  margin-top: 4px;
  white-space: nowrap;
}

/* —— Contact —— */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 72px);
  max-width: 1000px;
}

.contact-block h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.contact-block > p {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 14px;
  margin-bottom: 28px;
  line-height: 1.7;
}

.info-list li {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.info-list .label {
  width: 40px;
  color: var(--ink-3);
  font-size: 12px;
  letter-spacing: 0.1em;
  flex-shrink: 0;
  padding-top: 3px;
}

.info-list a {
  border-bottom: 1px solid var(--ink);
  padding-bottom: 1px;
}

.info-list a:hover {
  opacity: 0.5;
}

.contact-block .btn {
  margin-top: 28px;
}

.step-list li {
  padding: 20px 0 20px 56px;
  border-bottom: 1px solid var(--line);
  position: relative;
  color: var(--ink-3);
  font-weight: 300;
  font-size: 14px;
  line-height: 1.7;
}

.step-list li:last-child {
  border-bottom: none;
}

.step-list li::before {
  content: attr(data-n);
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--ink);
  letter-spacing: 0.06em;
}

.step-list strong {
  display: block;
  color: var(--ink);
  font-weight: 500;
  font-size: 15px;
  margin-bottom: 4px;
  font-family: var(--font-body);
}

/* —— Join —— */
.join-intro {
  max-width: 520px;
  color: var(--ink-3);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 48px;
}

.job-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 40px;
  max-width: 960px;
}

.job-card {
  background: var(--bg);
  padding: clamp(28px, 3vw, 36px);
  transition: background 0.3s ease, color 0.3s ease;
}

.job-card:hover {
  background: var(--ink);
  color: #fff;
}

.job-card:hover .meta,
.job-card:hover p {
  color: rgba(255, 255, 255, 0.5);
}

.job-card .meta {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  margin-bottom: 12px;
}

.job-card h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.job-card p {
  font-size: 14px;
  color: var(--ink-3);
  font-weight: 300;
  line-height: 1.7;
}

.join-cta {
  max-width: 960px;
  padding: 48px;
  border: 1px solid var(--ink);
  text-align: center;
}

.join-cta h2 {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.join-cta p {
  color: var(--ink-3);
  font-weight: 300;
  font-size: 14px;
  margin-bottom: 24px;
}

/* —— Legal —— */
.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(48px, 8vh, 72px) clamp(20px, 5vw, 32px) 80px;
}

.legal-hero {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.legal-hero h1 {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 600;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}

.legal-meta {
  font-size: 13px;
  color: var(--ink-3);
}

.legal-callout {
  padding: 18px 20px;
  margin-bottom: 36px;
  border-left: 2px solid var(--ink);
  background: var(--bg-mute);
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.75;
}

.legal-section {
  margin-bottom: 36px;
}

.legal-section h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.legal-section h3 {
  font-size: 15px;
  font-weight: 500;
  margin: 18px 0 8px;
}

.legal-section p {
  font-size: 14px;
  color: var(--ink-2);
  margin-bottom: 10px;
  text-align: justify;
  line-height: 1.8;
  font-weight: 300;
}

.legal-section ul {
  padding-left: 18px;
  margin-bottom: 12px;
}

.legal-section li {
  list-style: disc;
  font-size: 14px;
  color: var(--ink-2);
  margin: 6px 0;
  line-height: 1.7;
  font-weight: 300;
}

.legal-section strong {
  color: var(--ink);
  font-weight: 500;
}

.legal-contact {
  margin-top: 48px;
  padding: 36px;
  border: 1px solid var(--line);
  text-align: center;
}

.legal-contact h3 {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.legal-contact p {
  font-size: 14px;
  color: var(--ink-3);
  margin-bottom: 6px;
  font-weight: 300;
}

.legal-contact a {
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
}

/* —— Footer —— */
.footer {
  border-top: 1px solid var(--line);
  padding: 28px clamp(20px, 5vw, 64px);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--ink);
}

/* —— Reveal —— */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* —— Responsive —— */
@media (max-width: 900px) {
  .teaser-grid,
  .about-grid,
  .contact-wrap,
  .job-grid,
  .vision-points {
    grid-template-columns: 1fr;
  }

  .app-row {
    grid-template-columns: 48px 1fr;
  }

  .app-row .tag {
    grid-column: 2;
  }

  .stats {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 20px;
  }

  .stats li {
    flex: 1 1 100px;
    border-bottom: none;
    padding-bottom: 0;
  }
}

@media (max-width: 640px) {
  .nav-links {
    gap: 14px;
    font-size: 12px;
  }

  .nav-links a:not(.nav-cta) {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
  }

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

  .join-cta {
    padding: 32px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}