/* 先见 GEO — 原生 CSS 设计系统 */
:root {
  --radius: 0.75rem;
  --background: oklch(0.985 0.006 95);
  --foreground: oklch(0.22 0.03 240);
  --card: oklch(1 0 0);
  --primary: oklch(0.48 0.11 215);
  --primary-foreground: oklch(0.99 0.005 95);
  --primary-glow: oklch(0.72 0.13 195);
  --secondary: oklch(0.955 0.012 210);
  --muted: oklch(0.955 0.008 210);
  --muted-foreground: oklch(0.53 0.025 235);
  --accent: oklch(0.93 0.05 190);
  --accent-foreground: oklch(0.3 0.06 220);
  --ember: oklch(0.68 0.15 55);
  --border: oklch(0.9 0.012 225);
  --ring: oklch(0.6 0.09 205);
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", system-ui, -apple-system, "PingFang SC", sans-serif;
  --gradient-hero:
    radial-gradient(120% 90% at 12% 0%, color-mix(in oklab, var(--primary-glow) 26%, transparent), transparent 60%),
    radial-gradient(90% 80% at 95% 10%, color-mix(in oklab, var(--ember) 16%, transparent), transparent 60%);
  --gradient-ink: linear-gradient(100deg, var(--primary), var(--primary-glow));
  --shadow-soft: 0 1px 2px oklch(0.4 0.05 235 / 0.05), 0 18px 40px -24px oklch(0.4 0.06 235 / 0.28);
  --shadow-lift: 0 24px 60px -28px oklch(0.45 0.08 220 / 0.4);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

h1,
h2,
h3,
.font-display {
  font-family: var(--font-display);
  letter-spacing: 0.01em;
  margin: 0;
  line-height: 1.25;
}

p {
  margin: 0;
}

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

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

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

::selection {
  background: color-mix(in oklab, var(--primary-glow) 40%, transparent);
}

/* layout */
.container {
  width: 100%;
  max-width: 1152px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-sm {
  max-width: 768px;
}

.section {
  padding: 96px 0;
}

.section-tight {
  padding: 80px 0;
}

.bordered-y {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.bordered-t {
  border-top: 1px solid var(--border);
}

.bg-soft {
  background: color-mix(in oklab, var(--secondary) 55%, var(--background));
}

.bg-muted {
  background: color-mix(in oklab, var(--muted) 60%, var(--background));
}

.bg-cardish {
  background: color-mix(in oklab, var(--card) 75%, var(--background));
}

.grid {
  display: grid;
  gap: 24px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-side {
  grid-template-columns: 1.35fr 1fr;
  gap: 32px;
}

.stack>*+* {
  margin-top: 24px;
}

.stack-lg>*+* {
  margin-top: 48px;
}

/* typography helpers */
.eyebrow {
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--primary);
  text-transform: uppercase;
}

.muted {
  color: var(--muted-foreground);
}

.small {
  font-size: 13px;
}

.lead {
  font-size: 17px;
  line-height: 1.9;
  color: var(--muted-foreground);
}

.prose p {
  font-size: 15.5px;
  line-height: 2;
  color: var(--muted-foreground);
}

.h1 {
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  font-weight: 700;
}

.h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 700;
}

.h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.text-gradient {
  background: var(--gradient-ink);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.divider {
  height: 1px;
  width: 100%;
  background: var(--border);
}

/* surfaces */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 8px);
  box-shadow: var(--shadow-soft);
}

.card-pad {
  padding: 30px;
}

.card-hover {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

/* buttons */
.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 13px 28px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.25s ease, background-color 0.25s ease;
  font-family: inherit;
}

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

.btn-primary {
  background: var(--primary);
  color: var(--primary-foreground);
  box-shadow: var(--shadow-soft);
}

.btn-ghost {
  background: var(--card);
  border-color: var(--border);
  color: var(--foreground);
}

.btn-ghost:hover {
  background: var(--secondary);
}

.btn-sm {
  padding: 9px 20px;
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
  background: color-mix(in oklab, var(--background) 82%, transparent);
  backdrop-filter: blur(12px);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 14px;
  font-weight: 700;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.brand-sub {
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--muted-foreground);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
  color: var(--muted-foreground);
}

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

.nav-links a:hover {
  color: var(--foreground);
}

.nav-links a.active {
  color: var(--foreground);
  font-weight: 500;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 7px 10px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--foreground);
  border-radius: 2px;
}

.nav-toggle span+span {
  margin-top: 4px;
}

/* hero */
.hero {
  position: relative;
  overflow: hidden;
  background-image: var(--gradient-hero);
}

.hero-inner {
  position: relative;
  padding: 84px 15px 96px;
}

.grid-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.6;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, black, transparent 75%);
  mask-image: radial-gradient(70% 60% at 50% 30%, black, transparent 75%);
}

.orb {
  position: absolute;
  right: -96px;
  top: 96px;
  width: 288px;
  height: 288px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--primary-glow) 25%, transparent);
  filter: blur(60px);
  pointer-events: none;
}

.tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 12px;
  color: var(--muted-foreground);
}

.tagline .dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--ember);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 36px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-top: 56px;
  max-width: 680px;
}

.stats dt {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
}

.stats dd {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--muted-foreground);
}

/* platforms */
.platform-head {
  text-align: center;
}

.platform-kicker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--primary-glow);
}

.platform-kicker i {
  display: block;
  width: 32px;
  height: 1px;
  background: var(--primary-glow);
}

.platform-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
}

.platform {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 11px 20px;
  box-shadow: var(--shadow-soft);
  animation: platform-float 4s ease-in-out infinite;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.platform:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 0 24px 2px color-mix(in oklab, var(--primary-glow) 25%, transparent);
}

.platform-icon {
  position: relative;
  display: grid;
  place-items: center;
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  overflow: hidden;
  font-size: 11px;
  font-weight: 700;
  color: var(--primary-foreground);
}

.platform-icon img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 2px;
  background: var(--card);
}

.platform-name {
  font-size: 14px;
  font-weight: 600;
}

.platform-meta {
  font-size: 12px;
  color: var(--muted-foreground);
}

@keyframes platform-float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-6px);
  }
}

/* value / method */
.value-no {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--primary);
}

.value-stat {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 700;
}

.value-foot {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.step-index {
  position: absolute;
  right: 22px;
  top: 18px;
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--border);
}

.chip {
  display: inline-block;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-foreground);
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
}

.bullets li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: var(--muted-foreground);
}

.bullets li+li {
  margin-top: 12px;
}

.bullets li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  margin-top: 8px;
  border-radius: 999px;
  background: var(--primary-glow);
}

/* cases */
.case-split {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  overflow: hidden;
}

.case-media {
  position: relative;
  min-height: 240px;
  overflow: hidden;
  background: color-mix(in oklab, var(--secondary) 70%, var(--background));
}

.case-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s ease;
}

.case-split:hover .case-media img,
.case-card:hover .case-media img {
  transform: scale(1.06);
}

.case-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 32px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  border-radius: 14px;
  background: color-mix(in oklab, var(--secondary) 65%, var(--background));
  padding: 20px;
}

.metrics dt {
  font-size: 12px;
  color: var(--muted-foreground);
}

.metrics dd {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
}

.case-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.case-card .case-media {
  min-height: 160px;
  height: 160px;
}

.case-card .case-body {
  padding: 24px;
  flex: 1;
}

.case-card .card,
.case-split .card{
  border: none;
  background-color: unset;
}

.pd15 .card{
  padding: 15px;
}

.case-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background-image: var(--gradient-hero);
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: color-mix(in oklab, var(--primary) 35%, transparent);
}

.link-more {
  display: inline-block;
  font-size: 14px;
  color: var(--primary);
  transition: transform 0.25s ease;
}

.card-hover:hover .link-more {
  transform: translateX(4px);
}

/* lists */
.news-item {
  display: flex;
  flex-direction: row;
  gap: 32px;
  padding: 28px;
}

.news-date {
  flex: none;
  width: 112px;
}

.news-date time {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
}

.tag {
  display: inline-block;
  margin-top: 8px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-foreground);
  padding: 4px 12px;
  font-size: 11px;
}

/* forms */
.field {
  display: block;
  font-size: 14px;
  margin-bottom: 20px;
}

.field>span {
  color: var(--muted-foreground);
}

.field input,
.field textarea {
  width: 100%;
  margin-top: 8px;
  font: inherit;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--background);
  padding: 12px 16px;
  outline: none;
  color: inherit;
}

.field input:focus,
.field textarea:focus {
  box-shadow: 0 0 0 2px var(--ring);
}

.inline-form {
  display: flex;
  gap: 12px;
  max-width: 560px;
  margin: 40px auto 0;
}

.inline-form input {
  flex: 1;
  font: inherit;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  padding: 12px 20px;
  outline: none;
  color: inherit;
}

.inline-form input:focus {
  box-shadow: 0 0 0 2px var(--ring);
}

.form-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted-foreground);
}

.form-ok {
  margin-top: 14px;
  font-size: 13px;
  color: var(--primary);
}

/* footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  color: var(--muted-foreground);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--foreground);
}

/* reveal states (JS 未加载时保持可见) */
.js [data-reveal],
.js [data-stagger]>*,
.js [data-anim="hero"]>* {
  will-change: transform, opacity;
}

@media (max-width: 900px) {
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .section {
    padding: 72px 0;
  }
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 16px;
  }

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

  .nav-links a {
    padding: 10px 0;
    width: 100%;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: relative;
    padding: 14px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .inline-form {
    flex-direction: column;
  }

  .news-item {
    flex-direction: column;
    gap: 14px;
  }

  .news-date {
    width: auto;
  }

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