/* Corporate design tokens — 8pt baseline grid */
:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-deep: #1e3a8a;
  --color-secondary: #8b5cf6;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-text-inverse: #f9fafb;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;
  --color-bg: #f9fafb;
  --color-bg-alt: #f3f4f6;
  --color-footer: #0f172a;
  --font-primary: "Open Sans", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-display: "Poppins", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 80px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.06);
  --shadow-md: 0 8px 24px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 24px 48px rgba(30, 58, 138, 0.12);
  --header-height: 72px;
  --focus-ring: 0 0 0 3px rgba(59, 130, 246, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

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

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

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:focus-visible,
button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

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

.skip-link {
  position: absolute;
  top: -48px;
  left: var(--space-2);
  z-index: 100;
  padding: 12px var(--space-2);
  background: var(--color-primary);
  color: var(--color-surface);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--space-2);
}

.container {
  width: min(1180px, calc(100% - var(--space-6)));
  margin: 0 auto;
}

/* Header */
.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
}

.nav-shell {
  width: min(1280px, calc(100% - var(--space-6)));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-inverse);
  min-height: 44px;
}

.site-header.scrolled .brand {
  color: var(--color-text);
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-surface);
  background: var(--color-primary);
  border-radius: var(--radius-md);
}

.site-header.scrolled .brand-mark {
  background: var(--color-primary);
  color: var(--color-surface);
}

.brand strong {
  display: block;
  max-width: 268px;
  overflow: hidden;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  opacity: 0.72;
}

.site-nav {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 14px;
  font-weight: 500;
  color: rgba(249, 250, 251, 0.88);
}

.site-header.scrolled .site-nav {
  color: var(--color-text-muted);
}

.site-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 4px;
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--color-text-inverse);
}

.site-header.scrolled .site-nav a:hover {
  color: var(--color-primary);
}

.nav-action {
  padding: 10px var(--space-2);
  color: var(--color-surface) !important;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: background 0.2s ease, transform 0.2s ease;
}

.nav-action:hover {
  background: var(--color-primary-dark);
  color: var(--color-surface) !important;
}

.site-header.scrolled .nav-action:hover {
  color: var(--color-surface) !important;
}

.nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 3px 0;
  background: var(--color-text-inverse);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-header.scrolled .nav-toggle span {
  background: var(--color-text);
}

/* Hero */
.hero {
  position: relative;
  min-height: 720px;
  overflow: hidden;
  color: var(--color-text-inverse);
  background: linear-gradient(135deg, var(--color-primary-deep) 0%, #1d4ed8 48%, var(--color-primary) 100%);
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
}

.hero-layout {
  position: relative;
  min-height: 720px;
  padding-top: calc(var(--header-height) + var(--space-3));
  padding-bottom: var(--space-7);
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: var(--space-7);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
}

.hero h1 {
  max-width: 640px;
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-display);
  font-size: clamp(36px, 4.5vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-lead {
  max-width: 580px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(249, 250, 251, 0.82);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.button {
  min-width: 132px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px var(--space-3);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button-primary {
  color: var(--color-primary-deep);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.button-primary:hover {
  background: var(--color-bg);
}

.button-ghost {
  color: var(--color-text-inverse);
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.button-ghost:hover {
  border-color: var(--color-surface);
  background: rgba(255, 255, 255, 0.08);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  max-width: 520px;
  margin-top: var(--space-6);
}

.hero-metrics div {
  padding: var(--space-2);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
}

.hero-metrics strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.hero-metrics span {
  display: block;
  margin-top: var(--space-1);
  font-size: 12px;
  color: rgba(249, 250, 251, 0.7);
}

/* Hero visual */
.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-panel {
  position: relative;
  width: min(100%, 380px);
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
}

.phone-mockup {
  position: relative;
  width: 260px;
  height: 500px;
  margin: 0 auto;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 28px;
  background: rgba(15, 23, 42, 0.35);
  box-shadow: var(--shadow-lg);
}

.phone-top {
  position: absolute;
  top: 10px;
  left: 50%;
  width: 72px;
  height: 5px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.4);
  transform: translateX(-50%);
}

.app-screen {
  height: 100%;
  overflow: hidden;
  border-radius: 20px;
  background: var(--color-surface);
  padding: var(--space-3) var(--space-2);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.app-header i {
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-bg);
}

.app-hero {
  margin-top: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-surface);
}

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

.app-hero small {
  font-size: 11px;
  font-weight: 600;
  opacity: 0.9;
}

.app-hero strong {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
}

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

.app-grid span {
  height: 64px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
}

.app-list {
  margin-top: var(--space-2);
}

.app-list p {
  height: 36px;
  margin-top: var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.data-chip {
  position: absolute;
  z-index: 2;
  min-width: 160px;
  padding: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.data-chip small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

.data-chip strong {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.chip-a {
  top: 0;
  right: -8px;
}

.chip-b {
  left: -8px;
  bottom: var(--space-5);
}

/* Sections */
.section {
  padding: var(--space-8) 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: var(--space-5);
}

.section-head .eyebrow,
.capability-copy .eyebrow,
.about-panel .eyebrow,
.contact .eyebrow {
  color: var(--color-primary);
}

.section-head h2,
.capability-copy h2,
.about-panel h2,
.contact h2 {
  margin-top: var(--space-2);
  font-family: var(--font-display);
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.section-head span {
  display: block;
  margin-top: var(--space-2);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

.product {
  background: var(--color-surface);
}

.product-layout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.product-card {
  min-height: 260px;
  padding: var(--space-4) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  border-top: 3px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.product-card:hover {
  border-color: var(--color-border-strong);
  border-top-color: var(--color-secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-index {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.35;
}

.product-card h3 {
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
}

.product-card p {
  margin-top: var(--space-2);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* Capability */
.capability {
  background: var(--color-bg-alt);
}

.capability-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: var(--space-7);
  align-items: center;
}

.capability-copy > p {
  margin-top: var(--space-3);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-muted);
}

.capability-board {
  position: relative;
  padding: var(--space-5) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.process-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
}

.process-steps li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
}

.step-num {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-surface);
  background: var(--color-primary);
  border-radius: 50%;
}

.step-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
}

.signal-panel {
  margin-top: var(--space-4);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary-deep), var(--color-primary));
  color: var(--color-text-inverse);
}

.signal-panel i {
  display: block;
  width: 40px;
  height: 4px;
  margin-bottom: var(--space-2);
  background: var(--color-surface);
  border-radius: 2px;
}

.signal-panel strong {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.signal-panel small {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  opacity: 0.8;
}

/* About */
.about {
  background: var(--color-bg);
}

.about-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-3);
  align-items: stretch;
}

.about-panel {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.about-panel p:last-child {
  margin-top: var(--space-3);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-muted);
}

.value-list {
  display: grid;
  gap: var(--space-2);
}

.value-item {
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.value-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.value-item b {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.1em;
}

.value-item h3 {
  margin-top: var(--space-2);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
}

.value-item p {
  margin-top: var(--space-1);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* Contact */
.contact {
  padding: var(--space-7) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-primary-deep), #1d4ed8);
  color: var(--color-text-inverse);
}

.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact .eyebrow {
  color: rgba(255, 255, 255, 0.75);
}

.contact h2 {
  color: var(--color-text-inverse);
}

.contact-inner > p:not(.eyebrow) {
  max-width: 560px;
  margin: var(--space-2) 0 var(--space-4);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(249, 250, 251, 0.85);
}

.contact .button-primary {
  color: var(--color-primary-deep);
  background: var(--color-surface);
}

.contact .button-primary:hover {
  background: var(--color-bg);
}

/* Footer */
.site-footer {
  color: rgba(249, 250, 251, 0.72);
  background: var(--color-footer);
}

.footer-inner {
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner strong,
.footer-inner span {
  display: block;
}

.footer-inner strong {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-inverse);
}

.footer-inner span {
  margin-top: var(--space-1);
  font-size: 13px;
}

.footer-inner a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  transition: color 0.2s ease;
}

.footer-inner a:hover {
  color: var(--color-primary);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* Responsive */
@media (max-width: 1100px) {
  .brand strong {
    max-width: 220px;
  }

  .site-nav {
    gap: var(--space-2);
  }
}

@media (max-width: 920px) {
  .nav-toggle {
    display: flex;
    flex-direction: column;
  }

  .site-nav {
    position: fixed;
    inset: 0 0 auto;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    padding: calc(var(--header-height) + var(--space-3)) var(--space-3) var(--space-4);
    background: var(--color-surface);
    color: var(--color-text);
    box-shadow: var(--shadow-lg);
    transform: translateY(-110%);
    transition: transform 0.3s ease;
  }

  .site-nav.open {
    transform: none;
  }

  .site-nav a {
    width: 100%;
    font-size: 16px;
  }

  .site-header.scrolled .site-nav a:hover {
    color: var(--color-primary);
  }

  .nav-toggle.active span:first-child {
    transform: translateY(8px) rotate(45deg);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:last-child {
    transform: translateY(-8px) rotate(-45deg);
  }

  .hero,
  .hero-layout {
    min-height: auto;
  }

  .hero-layout,
  .capability-layout,
  .about-layout {
    grid-template-columns: 1fr;
  }

  .hero-layout {
    gap: var(--space-5);
    padding-bottom: var(--space-6);
  }

  .product-layout {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
    row-gap: var(--space-4);
  }
}

@media (max-width: 620px) {
  .container,
  .nav-shell {
    width: min(100% - var(--space-4), 1180px);
  }

  .brand strong {
    max-width: 200px;
    font-size: 14px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-actions,
  .hero-metrics,
  .footer-inner {
    flex-direction: column;
    align-items: stretch;
  }

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

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

  .section {
    padding: var(--space-7) 0;
  }

  .about-panel {
    padding: var(--space-4);
  }

  .phone-mockup {
    width: 220px;
    height: 420px;
  }

  .chip-a {
    right: 0;
  }

  .chip-b {
    left: 0;
    bottom: var(--space-3);
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    align-items: flex-start;
  }
}