/* =========================================================
   码步鱼 — 科技风 / AI 风官网样式（浅色主题）
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --panel: rgba(255, 255, 255, 0.78);
  --text: #0f172a;
  --text-muted: #64748b;
  --primary: #0ea5e9;
  --primary-dim: rgba(14, 165, 233, 0.08);
  --accent: #7c3aed;
  --accent-dim: rgba(124, 58, 237, 0.08);
  --success: #10b981;
  --border: rgba(15, 23, 42, 0.09);
  --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.1);
  --radius: 18px;
  --max-width: 1200px;
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

.container {
  width: min(92%, var(--max-width));
  margin-inline: auto;
}

/* Header
   ========================================================= */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 1000;
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid;
  place-items: center;
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(14, 165, 233, 0.28);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav a {
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
  position: relative;
}

.nav a:hover,
.nav a:focus {
  color: var(--primary);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.25s ease;
}

.nav a:hover::after {
  width: 100%;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(14, 165, 233, 0.3);
  color: var(--primary);
  font-size: 0.9rem;
  background: rgba(14, 165, 233, 0.06);
  transition: all 0.25s ease;
}

.header-cta:hover {
  background: rgba(14, 165, 233, 0.12);
  box-shadow: 0 6px 18px rgba(14, 165, 233, 0.18);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
}

/* Hero
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
  background: linear-gradient(180deg, #f8fbff 0%, #ffffff 55%);
}

#particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.9;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 28%, rgba(14, 165, 233, 0.16) 0%, transparent 38%),
    radial-gradient(circle at 82% 68%, rgba(124, 58, 237, 0.12) 0%, transparent 38%);
  z-index: 1;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.045) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(circle at center, black 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at center, black 0%, transparent 75%);
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 880px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: var(--shadow-sm);
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.6rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.6);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.2rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2.2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease;
  border: 1px solid transparent;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff;
  box-shadow: 0 12px 30px rgba(14, 165, 233, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 16px 40px rgba(14, 165, 233, 0.36);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.7);
}

.btn-ghost:hover {
  border-color: rgba(14, 165, 233, 0.45);
  background: rgba(14, 165, 233, 0.06);
  color: var(--primary);
}

.hero-stats {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  gap: clamp(1.5rem, 5vw, 4rem);
  margin-top: 4rem;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat strong {
  display: block;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  background: linear-gradient(135deg, #0f172a, var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Sections common
   ========================================================= */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-head {
  max-width: 720px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.section-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 0.7rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* About
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.about-visual {
  position: relative;
  min-height: 320px;
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 30% 30%, rgba(14, 165, 233, 0.12), transparent 55%),
    radial-gradient(circle at 70% 70%, rgba(124, 58, 237, 0.12), transparent 55%),
    var(--bg-soft);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.about-visual svg {
  position: relative;
  z-index: 1;
  width: 140px;
  height: 140px;
  opacity: 0.95;
}

.about-text h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1rem;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tech-tags span {
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Business cards
   ========================================================= */
.business {
  background:
    radial-gradient(circle at 8% 15%, rgba(14, 165, 233, 0.07) 0%, transparent 42%),
    radial-gradient(circle at 92% 85%, rgba(124, 58, 237, 0.07) 0%, transparent 42%),
    var(--bg-soft);
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.card {
  position: relative;
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-dim), var(--accent-dim));
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(14, 165, 233, 0.35);
  box-shadow: var(--shadow-lg);
}

.card:hover::before {
  opacity: 1;
}

.card > * {
  position: relative;
  z-index: 1;
}

.card-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 1.2rem;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.18);
  color: var(--primary);
}

.card:nth-child(2) .card-icon { color: var(--accent); background: var(--accent-dim); border-color: rgba(124, 58, 237, 0.2); }
.card:nth-child(3) .card-icon { color: var(--success); background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.2); }
.card:nth-child(4) .card-icon { color: #db2777; background: rgba(219, 39, 119, 0.1); border-color: rgba(219, 39, 119, 0.2); }

.card h3 {
  font-size: 1.35rem;
  margin-bottom: 0.6rem;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-tags span {
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
  background: var(--bg-soft);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* Capabilities
   ========================================================= */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}

.cap-item {
  padding: 1.6rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.cap-item:hover {
  transform: translateY(-4px);
  border-color: rgba(14, 165, 233, 0.35);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
}

.cap-item svg {
  width: 40px;
  height: 40px;
  margin: 0 auto 1rem;
  color: var(--primary);
}

.cap-item h4 {
  font-size: 1rem;
  margin-bottom: 0.4rem;
}

.cap-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* CTA
   ========================================================= */
.cta {
  padding: 5rem 0;
}

.cta-box {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    radial-gradient(circle at 0% 0%, rgba(14, 165, 233, 0.1), transparent 45%),
    radial-gradient(circle at 100% 100%, rgba(124, 58, 237, 0.1), transparent 45%),
    #ffffff;
  box-shadow: var(--shadow-lg);
  padding: clamp(2.5rem, 5vw, 4rem);
  text-align: center;
  overflow: hidden;
}

.cta-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230f172a' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.cta-box h2 {
  position: relative;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin-bottom: 1rem;
}

.cta-box p {
  position: relative;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 1.8rem;
}

.cta-box .btn {
  position: relative;
}

/* Footer
   ========================================================= */
.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer .logo {
  font-size: 1.1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.copyright {
  width: 100%;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1.2rem;
}

.copyright a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

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

/* Responsive
   ========================================================= */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  :root {
    --header-h: 64px;
  }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }

  .nav.open {
    transform: translateY(0);
  }

  .nav a {
    padding: 0.9rem 1rem;
    border-radius: 10px;
  }

  .nav a:hover {
    background: rgba(14, 165, 233, 0.08);
  }

  .nav a::after {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

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

  .section {
    padding: 4rem 0;
  }

  .hero-stats {
    margin-top: 2.5rem;
  }
}

@media (max-width: 480px) {
  .capabilities-grid {
    grid-template-columns: 1fr;
  }

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