/* 祺壹智能官网 · 品牌色取自 Logo */
:root {
  --blue: #1a9ad6;
  --blue-dark: #0d7ab8;
  --green: #8dc63f;
  --green-dark: #6ba82e;
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: rgba(15, 23, 42, 0.08);
  --bg: #f8fafc;
  --white: #ffffff;
  --radius: 16px;
  --shadow: 0 24px 48px rgba(15, 23, 42, 0.08);
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s;
}

.site-header.scrolled {
  box-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand img {
  height: 40px;
  width: auto;
}

.brand-text {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-soft);
  transition: background 0.2s, color 0.2s;
}

.nav a:hover,
.nav a.active {
  background: rgba(26, 154, 214, 0.1);
  color: var(--blue-dark);
}

.nav-cta {
  background: linear-gradient(135deg, var(--blue), var(--green)) !important;
  color: #fff !important;
  font-weight: 600;
}

.nav-cta:hover {
  opacity: 0.92;
  background: linear-gradient(135deg, var(--blue), var(--green)) !important;
}

.menu-toggle {
  display: none;
  border: none;
  background: none;
  padding: 8px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
  border-radius: 2px;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
  background: linear-gradient(165deg, #eef8fc 0%, #f4f9ee 45%, #fff 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
}

.hero-orb.a {
  width: 480px;
  height: 480px;
  background: var(--blue);
  top: -120px;
  right: -80px;
}

.hero-orb.b {
  width: 360px;
  height: 360px;
  background: var(--green);
  bottom: -60px;
  left: -60px;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 64px 0 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
}

.hero-badge dot,
.hero-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(141, 198, 63, 0.25);
  flex-shrink: 0;
}

.hero-badge {
  display: inline-flex;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--blue-dark), var(--green-dark));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 0 0 32px;
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  box-shadow: 0 12px 32px rgba(26, 154, 214, 0.35);
}

.btn-outline {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.hero-visual {
  position: relative;
}

.hero-card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero-card-logo {
  width: 180px;
  margin: 0 auto 24px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.stat {
  padding: 16px;
  border-radius: var(--radius);
  background: var(--bg);
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--blue-dark);
  line-height: 1.2;
}

.stat span {
  font-size: 13px;
  color: var(--muted);
}

/* Sections */
section {
  padding: 96px 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}

.section-head h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.about-highlights {
  display: grid;
  gap: 16px;
}

.highlight-card {
  padding: 24px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.highlight-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.highlight-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* Cards grid */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(26, 154, 214, 0.12), rgba(141, 198, 63, 0.12));
}

.card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* Platform section */
.platform {
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0;
}

.platform .section-tag {
  color: var(--green);
}

.platform .section-head h2 {
  color: #fff;
}

.platform .section-head p {
  color: #94a3b8;
}

.platform-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.platform-features {
  display: grid;
  gap: 16px;
}

.platform-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.platform-item-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), var(--green));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  color: #fff;
}

.platform-item h4 {
  margin: 0 0 6px;
  color: #fff;
  font-size: 16px;
}

.platform-item p {
  margin: 0;
  font-size: 14px;
  color: #94a3b8;
}

.platform-mock {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 24px;
}

.mock-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.mock-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.mock-screen {
  border-radius: 12px;
  background: linear-gradient(145deg, #1a3a4a, #0c4848);
  padding: 32px 24px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.mock-title {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}

.mock-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mock-tags span {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(141, 198, 63, 0.2);
  color: #bbf7d0;
}

/* Certs */
.certs {
  background: var(--white);
}

.cert-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.cert-badge {
  padding: 14px 24px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--bg);
}

/* Case */
.case-banner {
  border-radius: 24px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--blue-dark), #0c4848);
  color: #fff;
  padding: 56px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.case-banner h3 {
  margin: 0 0 16px;
  font-size: 28px;
}

.case-banner p {
  margin: 0;
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
}

.case-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.case-metric {
  text-align: center;
  padding: 20px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
}

.case-metric strong {
  display: block;
  font-size: 32px;
  font-weight: 800;
}

.case-metric span {
  font-size: 13px;
  opacity: 0.85;
}

/* Timeline */
.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
  margin-top: 48px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--green));
  opacity: 0.3;
}

.timeline-item {
  text-align: center;
  padding: 0 12px;
  position: relative;
}

.timeline-year {
  width: 40px;
  height: 40px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.timeline-item h4 {
  margin: 0 0 8px;
  font-size: 15px;
}

.timeline-item p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h3 {
  margin: 0 0 20px;
  font-size: 24px;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 15px;
  color: var(--ink-soft);
}

.contact-list strong {
  color: var(--ink);
  min-width: 72px;
}

.contact-form {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 32px;
}

.form-row {
  margin-bottom: 16px;
}

.form-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink-soft);
}

.form-row input,
.form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  font-size: 14px;
}

.form-row textarea {
  min-height: 100px;
  resize: vertical;
}

.form-note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 12px;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: #94a3b8;
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img {
  height: 36px;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

.footer-brand p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  max-width: 320px;
}

.footer-col h4 {
  margin: 0 0 16px;
  color: #fff;
  font-size: 14px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  margin-bottom: 10px;
  color: #94a3b8;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--green);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Responsive */
@media (max-width: 960px) {
  .hero-grid,
  .about-grid,
  .platform-layout,
  .case-banner,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cards-3,
  .cards-4,
  .timeline {
    grid-template-columns: 1fr 1fr;
  }

  .timeline::before {
    display: none;
  }

  .nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 16px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .hero-visual {
    order: -1;
  }

  .case-metrics {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .cards-3,
  .cards-4,
  .timeline,
  .hero-stats {
    grid-template-columns: 1fr;
  }

  section {
    padding: 64px 0;
  }

  .case-banner {
    padding: 32px 24px;
  }
}