:root {
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --panel: #ffffff;
  --panel-strong: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --stroke: #e2e8f0;
  --brand: #2563eb;
  --brand2: #06b6d4;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
  --shadow-sm: 0 8px 22px rgba(2, 6, 23, 0.06);
  --radius: 16px;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC",
    "Noto Sans SC", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(900px 520px at 15% 0%, rgba(37, 99, 235, 0.10), transparent 58%),
    radial-gradient(840px 480px at 90% 8%, rgba(6, 182, 212, 0.08), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 38%, var(--bg) 100%);
  line-height: 1.6;
}

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

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

.skip-link {
  position: absolute;
  left: -999px;
  top: -999px;
  background: #fff;
  color: #000;
  padding: 8px 12px;
  border-radius: 10px;
  z-index: 9999;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid var(--stroke);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 220px;
}

.logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background-color: #ffffff;
  background-image: url("favicon.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  box-shadow: var(--shadow);
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-tagline {
  font-size: 12px;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.8);
  color: var(--text);
}

.nav-toggle:focus-visible {
  outline: 2px solid rgba(59, 130, 246, 0.8);
  outline-offset: 2px;
}

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

.site-nav a {
  display: inline-flex;
  position: relative;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  color: var(--muted);
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.site-nav a:after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 7px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand), var(--brand2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
  opacity: 0.9;
}

.site-nav a:hover {
  background: rgba(2, 6, 23, 0.03);
  color: var(--text);
}

.site-nav a:hover:after {
  transform: scaleX(1);
}

.site-nav a[aria-current="page"] {
  color: var(--text);
  border-color: rgba(37, 99, 235, 0.28);
  background: rgba(37, 99, 235, 0.06);
}

.site-nav a[aria-current="page"]:after {
  transform: scaleX(1);
}

/* Hero */
.hero {
  padding: 56px 0 26px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 20px;
  align-items: stretch;
}

.hero-card {
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.86));
  border-radius: var(--radius);
  padding: 22px 22px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-card:before {
  content: "";
  position: absolute;
  inset: -1px;
  background: radial-gradient(700px 260px at 15% 0%, rgba(37, 99, 235, 0.10), transparent 60%),
    radial-gradient(520px 240px at 92% 18%, rgba(6, 182, 212, 0.08), transparent 55%);
  pointer-events: none;
}

.hero-card > * {
  position: relative;
}

.kicker {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.06);
  color: rgba(15, 23, 42, 0.86);
  font-size: 13px;
}

.title {
  margin: 12px 0 8px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.4px;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  color: var(--text);
  background: rgba(255, 255, 255, 0.92);
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
  user-select: none;
}

.btn:hover {
  transform: translateY(-1px);
  background: #ffffff;
  border-color: rgba(37, 99, 235, 0.22);
}

.btn.primary {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.98), rgba(6, 182, 212, 0.92));
  border-color: rgba(37, 99, 235, 0.32);
  color: #ffffff;
}

.btn.primary:hover {
  background: linear-gradient(135deg, rgba(37, 99, 235, 1), rgba(6, 182, 212, 0.98));
}

.panel {
  border: 1px solid var(--stroke);
  background: var(--panel);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.panel h3 {
  margin: 0 0 10px;
  font-size: 15px;
}

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

.chip {
  display: inline-flex;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid rgba(2, 6, 23, 0.10);
  background: rgba(2, 6, 23, 0.03);
  color: rgba(15, 23, 42, 0.86);
  font-size: 13px;
}

/* Sections */
.section {
  padding: 26px 0;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.section-title {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.2px;
}

.section-desc {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.card {
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.88));
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(37, 99, 235, 0.18);
  box-shadow: 0 16px 40px rgba(2, 6, 23, 0.09);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
}

.card p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 13.5px;
}

.card ul {
  margin: 0;
  padding-left: 18px;
  color: rgba(15, 23, 42, 0.86);
  font-size: 13.5px;
}

.card li {
  margin: 4px 0;
}

.info-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.info-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--stroke);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.92);
}

.info-row dt {
  color: var(--muted);
}

.info-row dd {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-width: 0;
}

.info-value {
  overflow-wrap: anywhere;
}

.mini-btn {
  flex: 0 0 auto;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  cursor: pointer;
}

.mini-btn:hover {
  background: #ffffff;
  border-color: rgba(37, 99, 235, 0.22);
}

.form {
  display: grid;
  gap: 10px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  color: var(--muted);
  font-size: 13px;
}

input,
textarea {
  width: 100%;
  padding: 11px 12px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text);
  outline: none;
}

input:focus,
textarea:focus {
  border-color: rgba(59, 130, 246, 0.6);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.hint {
  color: var(--muted);
  font-size: 12.5px;
  margin: 0;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.8);
  padding: 22px 0;
  margin-top: 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}

.footer-title {
  margin: 0 0 6px;
  font-weight: 700;
}

.footer-meta {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.footer-links a {
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--muted);
}

.footer-links a:hover {
  border-color: var(--stroke);
  background: rgba(2, 6, 23, 0.03);
  color: var(--text);
}

/* Utilities */
.noscript-note {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 12px 0;
  color: rgba(15, 23, 42, 0.86);
}

.plain-list {
  margin: 0;
  padding-left: 18px;
  color: rgba(15, 23, 42, 0.86);
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 520ms ease, transform 520ms ease;
  will-change: opacity, transform;
}

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

/* Responsive */
@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .brand {
    min-width: unset;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    padding: 12px 0 14px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--stroke);
    backdrop-filter: blur(10px);
  }
  .site-nav.is-open {
    display: grid;
  }
  .site-nav a {
    width: min(var(--max), calc(100% - 40px));
    margin: 0 auto;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .info-row {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-links {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}