:root {
  --bg: #0b1020;
  --surface: #111831;
  --surface-soft: #1a2547;
  --text: #e9efff;
  --muted: #b8c4e6;
  --primary: #4f8cff;
  --primary-strong: #2f6fe9;
  --accent: #20d3a7;
  --border: #253258;
  --max-width: 1120px;
  --radius: 14px;
  --shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  background: radial-gradient(circle at top left, #172348, var(--bg) 45%);
  color: var(--text);
  line-height: 1.65;
}

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

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(11, 16, 32, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.95rem 0;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
}

.brand-badge {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--primary), var(--accent));
  box-shadow: var(--shadow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.96rem;
}

.nav-links a {
  color: var(--muted);
  transition: color 0.2s;
}

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

.menu-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 0.42rem 0.65rem;
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: none;
  border-radius: 10px;
  padding: 0.72rem 1rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(145deg, var(--primary), var(--primary-strong));
  color: white;
}

.btn-outline {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

.hero {
  padding: 5rem 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 3.6vw, 3.3rem);
  line-height: 1.2;
}

.hero p {
  color: var(--muted);
  max-width: 62ch;
}

.hero-actions {
  display: flex;
  gap: 0.7rem;
  margin-top: 1.2rem;
  flex-wrap: wrap;
}

.panel {
  background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.11);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 0.8rem;
}

.metric {
  background: rgba(7, 11, 24, 0.55);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem;
}

.metric strong {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 0.2rem;
}

.section {
  padding: 3rem 0;
}

.section h2 {
  margin-top: 0;
  font-size: clamp(1.5rem, 2.4vw, 2.3rem);
}

.section-lead {
  color: var(--muted);
  max-width: 70ch;
}

.grid-3,
.grid-2,
.grid-4 {
  display: grid;
  gap: 1rem;
}

.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));
}

.card {
  background: rgba(9, 15, 31, 0.72);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem;
}

.card h3 {
  margin-top: 0;
}

.card p,
.card li,
.muted {
  color: var(--muted);
}

ul.clean {
  padding-left: 1rem;
  margin: 0.35rem 0 0;
}

.highlight {
  color: var(--accent);
}

.cta {
  background: linear-gradient(125deg, rgba(79, 140, 255, 0.22), rgba(32, 211, 167, 0.15));
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: var(--radius);
  padding: 2rem;
}

.form {
  display: grid;
  gap: 0.8rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.95rem;
}

input,
textarea,
select {
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0c142c;
  color: var(--text);
  padding: 0.7rem 0.8rem;
  font: inherit;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.notice {
  display: none;
  background: rgba(32, 211, 167, 0.15);
  border: 1px solid rgba(32, 211, 167, 0.5);
  color: #bffff0;
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
}

.notice.show {
  display: block;
}

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  background: rgba(6, 9, 20, 0.8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, minmax(0,1fr));
  gap: 1rem;
  padding: 2rem 0;
}

.footer-grid h4 {
  margin: 0 0 0.6rem;
}

.footer-grid a {
  color: var(--muted);
  display: block;
  padding: 0.2rem 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 0.9rem 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.page-hero {
  padding: 3.2rem 0 1.6rem;
}

.article {
  max-width: 900px;
}

.article h2 {
  margin-top: 2rem;
}

.article p,
.article li {
  color: var(--muted);
}

@media (max-width: 920px) {
  .hero-grid,
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 760px) {
  .menu-btn {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 66px;
    right: 1rem;
    left: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.9rem;
    flex-direction: column;
    align-items: flex-start;
    display: none;
  }

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

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