:root {
  --bg: #f3f7fb;
  --bg-soft: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --accent: #f97316;
  --line: #dbe5f0;
  --ok: #16a34a;
  --radius: 16px;
  --shadow: 0 18px 42px rgba(19, 51, 98, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  background: radial-gradient(circle at 10% 0%, #eaf2ff 0%, #f3f7fb 40%, #f8fbff 100%);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(248, 251, 255, 0.9);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
}

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

.hero {
  padding: 72px 0 46px;
  text-align: center;
}

.hero h1 {
  margin: 0;
  max-width: none;
  line-height: 1.15;
  font-size: clamp(2rem, 4vw, 3.9rem);
  white-space: nowrap;
}

.hero p {
  margin: 16px 0 0;
  max-width: 66ch;
  margin-left: auto;
  margin-right: auto;
  color: var(--muted);
  line-height: 1.75;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 12px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 220ms ease, box-shadow 220ms ease, background-color 220ms ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.22);
}

.btn-secondary {
  background: var(--bg-soft);
  border-color: var(--line);
  color: var(--ink);
}

.section { padding: 36px 0; }

.section h2 {
  margin: 0 0 10px;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
}

.section-lead {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
  line-height: 1.7;
}

.badges {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: #274568;
  font-size: 0.85rem;
}

.grid {
  margin-top: 20px;
  display: grid;
  gap: 16px;
}

.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
  padding: 18px;
}

.card h3 { margin: 0 0 8px; }
.card p { margin: 0; color: var(--muted); line-height: 1.65; }
.card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.75;
}
.card li + li { margin-top: 8px; }

.meta {
  margin: 10px 0 0;
  font-family: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.8rem;
  color: #3b82f6;
}

.tool-links {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tool-links a {
  font-size: 0.88rem;
  color: var(--primary);
}
.tool-links a.btn {
  font-size: 1rem;
}
.tool-links a.btn-primary {
  color: #fff;
}
.tool-links a.btn-secondary {
  color: var(--ink);
}

.tool-switch {
  margin-top: 8px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tool-tab {
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: #1f3c5e;
  font-weight: 600;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.tool-tab:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(37, 99, 235, 0.12);
}

.tool-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  border-color: transparent;
}

.tool-title-btn {
  display: inline-flex;
  margin-top: 12px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  padding: 12px 20px;
  font-size: clamp(1.15rem, 2.5vw, 1.6rem);
  font-weight: 700;
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease, filter 200ms ease;
}

.tool-title-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 26px rgba(37, 99, 235, 0.25);
  filter: saturate(1.06);
}

.tool-title-btn::after {
  content: "->";
  font-family: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  opacity: 0.9;
}

.table-wrap {
  margin-top: 16px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th, td {
  padding: 12px;
  border-bottom: 1px solid #ebf1f6;
  text-align: left;
  font-size: 0.92rem;
}

th { background: #f7fbff; }

.contact {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 18px;
  align-items: center;
}

.qr {
  border-radius: 14px;
  border: 1px solid var(--line);
  width: 100%;
  background: #fff;
}

.site-footer {
  margin-top: 56px;
  padding: 26px 0 44px;
  border-top: 1px solid var(--line);
  color: #4a6482;
  font-size: 0.9rem;
}

.record-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.record-line img {
  width: 16px;
  height: auto;
}

@media (max-width: 960px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .contact { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav { flex-direction: column; align-items: flex-start; padding: 10px 0; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding-top: 46px; }
  .hero h1 { white-space: normal; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}