/* Reset & base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
:root {
  --color-bg: #f6f7fb;
  --color-text: #0f172a;
  --color-muted: #64748b;
  --color-accent: #4f46e5;
  --color-accent-2: #06b6d4;
  --color-surface: #ffffff;
  --color-surface-2: #f1f5f9;
  --color-border: #e5e7eb;
  --shadow-elev: 0 10px 30px rgba(2, 6, 23, 0.08);
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  color: #fff;
  padding: 68px 0 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}
/* Center title in header */
.site-header .container { text-align: center; }

.site-title { margin: 0; line-height: 1.2; }
.site-title .brand { display: block; font-size: 54px; font-weight: 800; letter-spacing: 0.2px; }
.site-title .policy { display: block; margin-top: 8px; font-size: 20px; font-weight: 700; opacity: 0.95; letter-spacing: 0.3px; text-transform: none; }
.site-title .support { display: inline-block; margin-left: 10px; padding: 2px 8px; font-size: 12px; font-weight: 700; color: #fff; background: rgba(255,255,255,0.18); border: 1px solid rgba(255,255,255,0.28); border-radius: 999px; vertical-align: middle; }

.site-subtitle { margin: 0; opacity: 0.95; }

main.container {
  background: var(--color-surface);
  margin-top: -20px;
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow-elev);
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
}

.toc { background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 12px; padding: 16px; }
.sidebar { position: sticky; top: 24px; align-self: start; }
.toc ol { margin: 8px 0 0; padding-left: 20px; }
.toc a { color: #334155; text-decoration: none; transition: color .2s ease; }
.toc a:hover { color: var(--color-accent); text-decoration: underline; }

.content { max-width: 760px; }
section { scroll-margin-top: 90px; }
h2 { margin-top: 28px; font-size: 24px; color: #0f172a; letter-spacing: 0.2px; position: relative; }
h2::after { content: ""; display: block; width: 48px; height: 2px; margin-top: 6px; background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2)); border-radius: 2px; }
h3 { margin-top: 18px; font-size: 18px; color: #111827; }
p { margin: 10px 0; color: var(--color-text); }
ul { margin: 8px 0 12px 20px; }
li { margin: 6px 0; }

.content section + section { border-top: 1px dashed var(--color-border); padding-top: 20px; margin-top: 20px; }

.note { background: #f8fafc; border: 1px solid var(--color-border); padding: 10px 12px; border-radius: 8px; }

.table-wrap { overflow-x: auto; margin: 12px 0; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border: 1px solid #e5e7eb; padding: 10px 12px; text-align: left; }
th { background: #f3f4f6; }

.site-footer { margin-top: 28px; padding-top: 16px; border-top: 1px solid #e5e7eb; color: #475569; }
.site-footer .small { font-size: 12px; color: #64748b; }
.back-to-top { display: inline-block; margin-top: 8px; color: #2563eb; text-decoration: none; }
.back-to-top:hover { text-decoration: underline; }

/* Form styles */
.form-card {
  margin-top: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 18px rgba(2, 6, 23, 0.06);
}
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field label { font-weight: 600; color: #0f172a; font-size: 14px; }
.input, .textarea, select.input {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  background: #fff;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.input:focus, .textarea:focus, select.input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}
.textarea { resize: vertical; }
.helper-text { margin-top: 6px; color: var(--color-muted); font-size: 12px; }
.checkbox-field .checkbox { display: flex; gap: 10px; align-items: flex-start; }
.checkbox-field input[type="checkbox"] { margin-top: 4px; }
.actions { display: flex; gap: 12px; margin-top: 8px; }
.btn { appearance: none; border: 1px solid var(--color-border); background: #fff; color: #0f172a; padding: 10px 14px; border-radius: 10px; cursor: pointer; font-weight: 600; }
.btn:hover { border-color: #cbd5e1; }
.btn-primary { background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2)); border-color: transparent; color: #fff; }
.btn-primary:hover { filter: brightness(1.02); }
.btn-ghost { background: transparent; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .content { max-width: 100%; }
}

@media (max-width: 640px) {
  .site-title .brand { font-size: 36px; }
  .site-title .policy { font-size: 18px; }
  .site-title .support { margin-left: 6px; font-size: 11px; padding: 2px 6px; }
  main.container { padding: 20px; }
}