/* ===== 下一程 · 基础样式 ===== */
:root {
  --primary: #0E7490;
  --primary-dark: #155E75;
  --accent: #06B6D4;
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --text: #0F172A;
  --muted: #64748B;
  --border: #E2E8F0;
  --high-fg: #B91C1C;
  --high-bg: #FEE2E2;
  --medium-fg: #B45309;
  --medium-bg: #FEF3C7;
  --low-fg: #047857;
  --low-bg: #D1FAE5;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.06);
  --max-width: 960px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== 顶部导航 ===== */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  min-height: 56px;
  gap: 8px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand:hover {
  text-decoration: none;
}

.brand-tag {
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

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

.site-nav a {
  padding: 6px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 15px;
}

.site-nav a:hover {
  background: var(--bg);
  color: var(--primary);
  text-decoration: none;
}

.site-nav a.active {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}

/* ===== 主体 ===== */
main {
  padding: 32px 0 48px;
}

.page-title {
  font-size: 28px;
  margin-bottom: 8px;
}

.page-subtitle {
  color: var(--muted);
  margin-bottom: 24px;
}

section {
  margin-bottom: 40px;
}

h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

/* ===== 卡片 ===== */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 16px;
}

/* ===== 徽章 ===== */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.badge-high {
  background: var(--high-bg);
  color: var(--high-fg);
}

.badge-medium {
  background: var(--medium-bg);
  color: var(--medium-fg);
}

.badge-low {
  background: var(--low-bg);
  color: var(--low-fg);
}

.badge-neutral {
  background: var(--bg);
  color: var(--muted);
  border: 1px solid var(--border);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  transition: background 0.15s;
}

.btn:hover {
  background: var(--primary-dark);
  text-decoration: none;
}

.btn-secondary {
  background: var(--card);
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-secondary:hover {
  background: #ECFEFF;
}

.btn-small {
  padding: 4px 12px;
  font-size: 13px;
}

.btn-danger {
  background: #fff;
  color: var(--high-fg);
  border: 1px solid var(--high-fg);
}

.btn-danger:hover {
  background: var(--high-bg);
}

/* ===== 表单 ===== */
input[type="text"],
textarea,
select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
  background: var(--card);
  color: var(--text);
}

input[type="text"]:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--accent);
  border-color: var(--accent);
}

label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 6px;
}

.form-row {
  margin-bottom: 16px;
}

.form-hint {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}

.form-error {
  font-size: 13px;
  color: var(--high-fg);
  margin-top: 4px;
}

/* ===== 列表 ===== */
.plain-list {
  list-style: none;
}

.dot-list {
  padding-left: 20px;
}

.dot-list li {
  margin-bottom: 6px;
}

/* ===== 页脚 ===== */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--card);
  padding: 24px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin-bottom: 6px;
}

/* ===== 工具类 ===== */
.muted {
  color: var(--muted);
}

.small {
  font-size: 13px;
}

.mt-8 {
  margin-top: 8px;
}

.mt-16 {
  margin-top: 16px;
}

.hidden {
  display: none !important;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .nav-inner {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .page-title {
    font-size: 24px;
  }

  .card {
    padding: 18px;
  }
}