:root {
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-tint: #eef2ff;
  --text: #0f172a;
  --text-soft: #475569;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: #eef2ff;
  --ok-bg: #ecfdf5;
  --ok-text: #047857;
  --err-bg: #fef2f2;
  --err-text: #dc2626;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .04);
  --shadow: 0 2px 8px rgba(15, 23, 42, .06);
  --shadow-lg: 0 10px 28px rgba(15, 23, 42, .09);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -.2px;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, #4f46e5, #6366f1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex: none;
  box-shadow: 0 2px 6px rgba(79, 70, 229, .3);
}

.logo-mark svg { width: 18px; height: 18px; }

.nav { display: flex; gap: 4px; flex-wrap: wrap; }

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 11px;
  border-radius: 8px;
  transition: color .15s, background .15s;
}

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

main { padding: 30px 0 60px; }

/* ---------- typography ---------- */
h1 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -.4px;
  margin: 0 0 10px;
  line-height: 1.35;
}

h2 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.2px;
  margin: 34px 0 14px;
}

h3 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--text);
}

.lead {
  color: var(--muted);
  font-size: 15.5px;
  margin: 0 0 26px;
  max-width: 760px;
}

.section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: .06em;
  margin: 32px 0 14px;
  text-transform: uppercase;
}

/* ---------- hero ---------- */
.hero {
  background: linear-gradient(160deg, #eef2ff 0%, #f8fafc 55%, #ffffff 100%);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 54px 32px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.hero h1 { font-size: 34px; margin-bottom: 14px; }
.hero .lead { margin: 0 auto 22px; max-width: 620px; font-size: 16px; }

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

.hero-badges span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, .8);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
}

.hero-badges svg { width: 14px; height: 14px; color: var(--primary); }

/* ---------- cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: 18px;
}

.card {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  background: #fff;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(79, 70, 229, .38);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.card-icon svg { width: 22px; height: 22px; }

.card h2 { font-size: 16px; margin: 0 0 6px; font-weight: 600; }
.card p { font-size: 13.5px; color: var(--muted); margin: 0; line-height: 1.6; }

/* ---------- panels ---------- */
.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}

.io { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-soft);
  margin-bottom: 8px;
}

input[type="text"], input[type="number"], input[type="datetime-local"], select, textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}

textarea {
  min-height: 158px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.6;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .13);
}

.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }

button {
  background: var(--primary);
  color: #fff;
  border: 0;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(79, 70, 229, .28);
  transition: background .15s, transform .12s;
}

button:hover { background: var(--primary-dark); transform: translateY(-1px); }
button:active { transform: translateY(0); }

button.secondary {
  background: #fff;
  color: var(--text-soft);
  border: 1px solid var(--border-strong);
  box-shadow: none;
}

button.secondary:hover {
  background: var(--bg-soft);
  color: var(--text);
  border-color: var(--primary);
}

.result {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 46px;
  color: var(--text);
}

.msg { font-size: 13px; margin: 10px 0 0; min-height: 20px; }
.msg.ok { color: var(--ok-text); }
.msg.err { color: var(--err-text); }

/* ---------- tables ---------- */
table.kv { width: 100%; border-collapse: collapse; }
table.kv td {
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  vertical-align: top;
}
table.kv td:first-child { color: var(--muted); width: 152px; font-size: 13.5px; }
table.kv tr:last-child td { border-bottom: 0; }
table.kv code, .mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}

/* ---------- tabs ---------- */
.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.tab {
  padding: 8px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
}
.tab:hover { border-color: var(--primary); color: var(--primary); }
.tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 1px 3px rgba(79, 70, 229, .28);
}

fieldset { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px; margin: 0; }
legend { font-size: 13px; font-weight: 600; padding: 0 6px; color: var(--text-soft); }
.checks { display: flex; gap: 18px; flex-wrap: wrap; }
.checks label { font-weight: 400; display: flex; align-items: center; gap: 7px; margin: 0; font-size: 14px; color: var(--text-soft); }
.checks input { width: auto; }

/* ---------- misc ---------- */
.ad-slot {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  color: var(--muted);
  font-size: 12.5px;
  background: var(--bg-soft);
  margin: 28px 0;
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tips {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 20px 22px;
  font-size: 14px;
  color: var(--text-soft);
}
.tips strong { color: var(--text); }
.tips ul { margin: 10px 0 0; padding-left: 20px; }
.tips li { margin-bottom: 6px; }
.tips a { color: var(--primary); text-decoration: none; }
.tips a:hover { text-decoration: underline; }
.tips p { margin: 0; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 26px 0 44px;
  color: var(--muted);
  font-size: 13px;
  background: var(--bg-soft);
}
.site-footer p { margin: 4px 0; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--primary); }

.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--primary); }

@media (max-width: 760px) {
  h1 { font-size: 24px; }
  .hero { padding: 38px 20px; }
  .hero h1 { font-size: 26px; }
  .io { grid-template-columns: 1fr; }
  .site-header .container { padding-top: 10px; padding-bottom: 10px; }
  .nav { gap: 2px; }
  .nav a { padding: 5px 8px; font-size: 13px; }
}