:root {
  --bg: #f4f6ff;
  --bg-deep: #e8edff;
  --text: #1f2937;
  --muted: #6b7280;
  --card: #ffffff;
  --primary: #4f46e5;
  --primary-strong: #4338ca;
  --accent: #f97316;
  --border: rgba(148, 163, 184, 0.35);
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

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

button,
input,
textarea {
  font-family: inherit;
}

.wrap {
  width: min(1360px, 100%);
  margin: 0 auto;
  padding: 0 3vw;
}

.bg-blur {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  z-index: -3;
}

.bg-one {
  top: -120px;
  left: -80px;
  background: radial-gradient(circle, #c7d2fe, transparent 70%);
}

.bg-two {
  bottom: -140px;
  right: -100px;
  background: radial-gradient(circle, #fde68a, transparent 70%);
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(148, 163, 184, 0.15) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: -4;
}

.hero {
  padding: 32px 0 90px;
  position: relative;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.3);
  backdrop-filter: blur(18px);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
  color: var(--muted);
}

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

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

.theme-toggle {
  border: 1px solid var(--border);
  padding: 8px 16px;
  background: #fff;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  margin-top: 50px;
  align-items: center;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(79, 70, 229, 0.12);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
}

.hero-text h1 {
  font-size: clamp(2.4rem, 4vw, 3.3rem);
  margin: 16px 0 12px;
}

.subtitle {
  color: var(--muted);
  margin-bottom: 24px;
  font-size: 1.05rem;
}

.cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 20px rgba(79, 70, 229, 0.25);
}

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

.btn.ghost {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.hero-highlights {
  margin-top: 24px;
  display: grid;
  gap: 10px;
}

.highlight {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.15);
}

.hero-card {
  background: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
  backdrop-filter: blur(14px);
}

.hero-side {
  display: grid;
  gap: 20px;
}

.hero-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 24px;
  align-items: start;
}

.hero-profile {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  min-width: 0;
}

.hero-profile h3 {
  margin: 6px 0 8px;
}

.hero-summary {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 360px;
}

.hero-about {
  min-width: 260px;
  padding-left: 12px;
  border-left: 1px dashed rgba(148, 163, 184, 0.35);
}

.hero-about .about-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
}

.hero-about h2 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.hero-about p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.avatar {
  width: 72px;
  height: 72px;
  min-width: 72px;
  min-height: 72px;
  flex: 0 0 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #ec4899);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 1.6rem;
  font-weight: 700;
}

.hero-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.hero-tags span {
  background: rgba(15, 23, 42, 0.06);
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
}

.hero-links {
  display: flex;
  justify-content: space-between;
  color: var(--primary);
  font-weight: 600;
}

.section {
  margin: 0 auto 70px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  margin-bottom: 24px;
}

.section-head p {
  color: var(--muted);
  margin: 6px 0 0;
}

.signature {
  text-align: right;
  color: var(--muted);
  font-size: 0.9rem;
}

.signature-title {
  display: block;
  font-weight: 600;
  color: var(--text);
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.stat {
  background: var(--card);
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.stat::after {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 80px;
  height: 80px;
  background: rgba(79, 70, 229, 0.12);
  border-radius: 50%;
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  display: block;
}

.stat-label {
  color: var(--muted);
  font-size: 0.9rem;
}

.callout {
  background: rgba(79, 70, 229, 0.12);
  color: var(--primary-strong);
  padding: 10px 16px;
  border-radius: 12px;
  font-size: 0.95rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.4), rgba(236, 72, 153, 0.2));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.card-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.card-title h3 {
  margin: 0;
  font-size: 1.1rem;
}

.status {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.status.online {
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}

.status.stable {
  background: rgba(59, 130, 246, 0.15);
  color: #2563eb;
}

.status.beta {
  background: rgba(249, 115, 22, 0.15);
  color: #ea580c;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.feature-list li {
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.feature-list li::before {
  content: "•";
  color: var(--primary);
}

.card-meta {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: auto;
}

.text-link {
  color: var(--primary);
  font-weight: 600;
}

.text-link::after {
  content: " →";
}

.contact-card {
  display: grid;
  gap: 8px;
  background: var(--card);
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 14px 18px;
  min-width: 220px;
}

.contact-section .section-head {
  flex-direction: column;
  align-items: flex-start;
}

.contact-section .contact-card {
  width: 100%;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.contact-label {
  color: var(--muted);
  font-size: 0.85rem;
  display: block;
}


.footer {
  padding: 20px 0 32px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow);
  display: none;
}

.to-top.show {
  display: grid;
  place-items: center;
}

body.dark {
  --bg: #0b1120;
  --bg-deep: #111827;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --card: rgba(17, 24, 39, 0.9);
  --primary: #38bdf8;
  --primary-strong: #0ea5e9;
  --accent: #f59e0b;
  --border: rgba(148, 163, 184, 0.2);
  --shadow: 0 20px 40px rgba(2, 6, 23, 0.4);
}

body.dark .nav {
  background: rgba(15, 23, 42, 0.7);
}

body.dark .hero-card,
body.dark .stat,
body.dark .contact-card,
body.dark .card {
  background: rgba(15, 23, 42, 0.7);
}

body.dark .theme-toggle {
  background: rgba(15, 23, 42, 0.7);
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-top {
    flex-direction: column;
  }

  .hero-about {
    padding-left: 0;
    border-left: none;
  }

  .hero-about .about-head {
    flex-direction: column;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .signature {
    text-align: left;
  }

  .contact-form {
    grid-template-columns: 1fr;
  }

  .contact-form textarea,
  .contact-form button {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  .nav {
    border-radius: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-links {
    width: 100%;
    justify-content: center;
  }
}