:root {
  --primary: #f97316;
  --primary-dark: #ea580c;
  --primary-soft: #fff7ed;
  --ink: #1f2937;
  --muted: #64748b;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --radius: 18px;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

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

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-ico {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
}

.nav {
  display: flex;
  gap: 26px;
  margin-left: auto;
}

.nav a {
  position: relative;
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--ink);
}

.nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 3px;
  border-radius: 99px;
  background: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 10px 22px rgba(249, 115, 22, 0.24);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

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

.btn-ghost:hover {
  border-color: #d1d5db;
  box-shadow: var(--shadow);
}

.btn-lg {
  padding: 14px 22px;
  font-size: 16px;
  border-radius: 14px;
}

.hero {
  padding: 92px 0 88px;
  background:
    radial-gradient(circle at 15% 20%, rgba(249, 115, 22, 0.12), transparent 28%),
    radial-gradient(circle at 85% 10%, rgba(59, 130, 246, 0.10), transparent 30%),
    #fff;
  text-align: center;
}

.hero-inner {
  max-width: 800px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.hero h1 {
  margin: 18px 0 12px;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.05em;
}

.lead {
  max-width: 650px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.section {
  padding: 78px 0;
}

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

.section-head {
  max-width: 660px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-head h2 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.03em;
}

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

.toolbar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 30px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px;
  min-height: 54px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.12);
}

.search-box input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  color: var(--ink);
}

.chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease, border 0.2s ease;
}

.chip:hover {
  color: var(--ink);
  border-color: #d1d5db;
}

.chip.active {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 190px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 2px 5px rgba(15, 23, 42, 0.02);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(249, 115, 22, 0.45);
  box-shadow: var(--shadow);
}

.card-ico {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: var(--primary-soft);
  font-size: 25px;
}

.card-body {
  flex: 1;
}

.card h3 {
  margin: 0 0 7px;
  font-size: 18px;
  letter-spacing: -0.01em;
}

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

.domain {
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  color: #94a3b8;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.arrow {
  position: absolute;
  top: 18px;
  right: 18px;
  color: #cbd5e1;
  font-size: 20px;
  transition: transform 0.2s ease, color 0.2s ease;
}

.card:hover .arrow {
  color: var(--primary);
  transform: translateX(3px);
}

.empty {
  padding: 60px 20px;
  text-align: center;
  color: var(--muted);
}

.empty span {
  font-size: 44px;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  text-align: center;
}

.feature-ico {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  margin-bottom: 16px;
  border-radius: 18px;
  background: var(--primary-soft);
  font-size: 29px;
}

.feature h3 {
  margin: 0 0 8px;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.about-inner {
  max-width: 760px;
}

.about-box {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.about-box p {
  margin: 0;
  color: var(--muted);
}

.about-box p + p {
  margin-top: 12px;
}

.section-cta {
  background: linear-gradient(135deg, #fff7ed 0%, #ffffff 55%, #eff6ff 100%);
  text-align: center;
}

.cta-inner {
  max-width: 760px;
}

.cta-inner h2 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.03em;
}

.cta-inner p {
  margin: 0 0 26px;
  color: var(--muted);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.site-footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-brand .brand-ico {
  width: 30px;
  height: 30px;
}

.footer-brand .brand-name {
  font-size: 16px;
}

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

@media (max-width: 760px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 0;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 20px;
  }

  .btn-primary {
    margin-left: auto;
  }

  .hero {
    padding: 64px 0;
  }

  .section {
    padding: 56px 0;
  }

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

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}