/* ==============================================================================
 * RailwaySystem - Visual Portal Design System v2.0
 * 风格：现代企业级 · 铁路工业数字化 · 克制 · 高可读性
 * 调色：Deep Navy / Rail Blue / Cyan 点缀 / 浅灰白底色
 * 离线纯静态支持，无任何外部 CDN 依赖
 * ============================================================================== */

:root {
  /* 调色板 - 铁路工业色系 */
  --navy-950: #090d16;
  --navy-900: #0f172a;
  --navy-800: #1e293b;
  --navy-700: #334155;
  --navy-600: #475569;
  
  --rail-blue-900: #1e3a8a;
  --rail-blue-800: #1e40af;
  --rail-blue: #1d4ed8;
  --rail-blue-light: #3b82f6;
  --rail-blue-subtle: #eff6ff;
  --rail-blue-border: #bfdbfe;

  --rail-cyan: #0284c7;
  --rail-cyan-light: #06b6d4;
  --cyan-subtle: #f0f9ff;
  --cyan-border: #bae6fd;

  /* 背景系统 */
  --bg-canvas: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-muted: #e2e8f0;

  /* 文本系统 */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  /* 状态颜色 */
  --pass-color: #059669;
  --pass-bg: #ecfdf5;
  --pass-border: #a7f3d0;

  --pending-color: #d97706;
  --pending-bg: #fffbeb;
  --pending-border: #fde68a;

  --danger-color: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;

  --info-color: #0284c7;
  --info-bg: #f0f9ff;
  --info-border: #bae6fd;

  /* 边框与阴影 */
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-strong: #94a3b8;
  
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --shadow-subtle: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-card: 0 1px 3px 0 rgba(15, 23, 42, 0.06), 0 1px 2px -1px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 8px 16px -2px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-drawer: -4px 0 24px rgba(15, 23, 42, 0.12);
  --shadow-modal: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.06);

  /* 排版尺寸 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --container-max: 1240px;
  --prose-max: 780px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.75;
  font-size: 0.95rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--rail-blue);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--rail-blue-800);
}

/* 顶部导航栏 (Navbar) */
.navbar {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.65rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-subtle);
}

.nav-brand-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-brand svg {
  width: 28px;
  height: 28px;
  fill: var(--rail-blue);
  flex-shrink: 0;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-900);
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.brand-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.brand-pill {
  font-size: 0.72rem;
  color: var(--pass-color);
  background: var(--pass-bg);
  border: 1px solid var(--pass-border);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.brand-pill::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pass-color);
}

.nav-menu {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  list-style: none;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.38rem 0.65rem;
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--rail-blue);
  background: var(--bg-subtle);
}

.nav-link.active {
  color: var(--rail-blue);
  background: var(--rail-blue-subtle);
  border-color: var(--rail-blue-border);
  font-weight: 600;
}

.nav-handbook-link {
  font-size: 0.82rem;
  color: var(--navy-800);
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  padding: 0.38rem 0.65rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.nav-handbook-link:hover {
  background: var(--rail-blue-subtle);
  color: var(--rail-blue);
  border-color: var(--rail-blue-border);
}

/* 下拉菜单 (Dropdown) */
.nav-dropdown {
  position: relative;
}

.dropdown-trigger {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
}

.dropdown-trigger:hover,
.nav-dropdown:hover .dropdown-trigger {
  color: var(--rail-blue);
  background: var(--bg-subtle);
}

.dropdown-trigger svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
  transition: transform 0.2s ease;
}

.nav-dropdown:hover .dropdown-trigger svg {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.35rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-modal);
  min-width: 200px;
  padding: 0.4rem 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.18s ease;
  z-index: 200;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.dropdown-item a:hover {
  background: var(--rail-blue-subtle);
  color: var(--rail-blue);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-light);
  margin: 0.35rem 0;
}

.nav-back-link {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  background: var(--bg-surface);
}

.nav-back-link:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

/* 页面主布局 */
.page-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 2.5rem 1.75rem 4rem;
  width: 100%;
  flex: 1;
}

/* 页面 Hero 头部 */
.page-hero {
  margin-bottom: 2.75rem;
}

.hero-pretitle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--rail-blue);
  background: var(--rail-blue-subtle);
  border: 1px solid var(--rail-blue-border);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.85rem;
}

.hero-title-main {
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--navy-900);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.hero-lead-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: var(--prose-max);
}

.hero-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.hero-meta-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* 状态徽章 (Badge System) - 克制规范 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  line-height: 1.2;
  white-space: nowrap;
}

.badge-pass, .badge-success {
  color: var(--pass-color);
  background: var(--pass-bg);
  border: 1px solid var(--pass-border);
}

.badge-pending, .badge-warning {
  color: var(--pending-color);
  background: var(--pending-bg);
  border: 1px solid var(--pending-border);
}

.badge-blocked, .badge-danger {
  color: var(--danger-color);
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
}

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

.badge-neutral {
  color: var(--navy-700);
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
}

.badge-reserved {
  color: #6366f1;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
}

/* 指标卡片网格 (Dashboard KPI Grid) */
.kpi-dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.kpi-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.25rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow-card);
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.kpi-value {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy-900);
  font-feature-settings: "tnum";
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.35rem;
}

.kpi-card.kpi-pass .kpi-value {
  color: var(--pass-color);
}

.kpi-card.kpi-pending .kpi-value {
  color: var(--pending-color);
}

.kpi-card.kpi-info .kpi-value {
  color: var(--rail-blue);
}

.kpi-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.kpi-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* 核心内容分块 (Section Block) */
.content-section {
  margin-bottom: 3.5rem;
}

.section-header {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
}

.section-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--navy-900);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  max-width: var(--prose-max);
}

/* 卡片系统 (Card Grid) */
.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1100px) {
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .card-grid-2, .card-grid-3, .card-grid-4 { grid-template-columns: 1fr; }
  .page-container { padding: 1.5rem 1rem 3rem; }
  .navbar { padding: 0.65rem 1rem; }
  .hero-title-main { font-size: 1.85rem; }
}

.standard-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.standard-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-card-hover);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.85rem;
}

.card-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.card-icon-box {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--rail-blue-subtle);
  color: var(--rail-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.card-title {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--navy-900);
}

.card-code {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
}

.card-body-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  flex: 1;
}

.card-footer-action {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.82rem;
}

/* 手风琴折叠面板 (Accordion) */
.accordion-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 0.85rem;
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.accordion-item:hover {
  border-color: var(--border-medium);
}

.accordion-header {
  padding: 1rem 1.35rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  background: var(--bg-surface);
  transition: background 0.15s ease;
}

.accordion-header:hover {
  background: var(--bg-subtle);
}

.accordion-title-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.accordion-arrow {
  width: 18px;
  height: 18px;
  fill: var(--text-muted);
  transition: transform 0.25s ease;
}

.accordion-item.open .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-body {
  display: none;
  padding: 1.25rem 1.35rem 1.5rem;
  border-top: 1px solid var(--border-light);
  background: #fafcff;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.accordion-item.open .accordion-body {
  display: block;
}

/* 步骤进度条 (Progress Stepper) */
.stepper-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
}

.stepper-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.step-row {
  display: flex;
  position: relative;
  padding-bottom: 2rem;
}

.step-row:last-child {
  padding-bottom: 0;
}

.step-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-right: 1.5rem;
  position: relative;
}

.step-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  z-index: 2;
  background: var(--bg-surface);
  border: 2px solid var(--border-medium);
  color: var(--text-muted);
}

.step-row.done .step-circle {
  background: var(--pass-color);
  border-color: var(--pass-color);
  color: #fff;
}

.step-row.in-progress .step-circle {
  background: var(--rail-blue);
  border-color: var(--rail-blue);
  color: #fff;
  box-shadow: 0 0 0 4px var(--rail-blue-subtle);
}

.step-row.pending .step-circle {
  background: var(--bg-subtle);
  border-color: var(--border-medium);
  color: var(--text-muted);
}

.step-line {
  position: absolute;
  top: 32px;
  bottom: 0;
  width: 2px;
  background: var(--border-light);
  z-index: 1;
}

.step-row:last-child .step-line {
  display: none;
}

.step-row.done .step-line {
  background: var(--pass-border);
}

.step-content {
  flex: 1;
  padding-top: 0.2rem;
}

.step-header-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.step-name {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--navy-900);
}

.step-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 抽屉组件 (Drawer) */
.drawer-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.drawer-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.drawer-panel {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: 540px;
  max-width: 90vw;
  background: var(--bg-surface);
  box-shadow: var(--shadow-drawer);
  z-index: 1001;
  transform: translateX(100%);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.drawer-backdrop.active .drawer-panel {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.35rem 1.75rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-900);
}

.drawer-close {
  background: transparent;
  border: 0;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease;
}

.drawer-close:hover {
  color: var(--navy-900);
  background: var(--bg-subtle);
}

.drawer-body {
  padding: 1.75rem;
  overflow-y: auto;
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.drawer-section {
  margin-bottom: 1.5rem;
}

.drawer-section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--navy-700);
  margin-bottom: 0.5rem;
  border-bottom: 1px dashed var(--border-light);
  padding-bottom: 0.25rem;
}

/* 代码与表格样式 */
pre, code {
  font-family: var(--font-mono);
}

code {
  font-size: 0.85em;
  background: var(--bg-subtle);
  color: var(--navy-800);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-light);
}

pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.65;
  margin: 0.75rem 0;
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  border: 0;
}

.data-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  margin: 1rem 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  text-align: left;
}

.data-table th {
  background: var(--bg-subtle);
  color: var(--navy-900);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.data-table tr:hover td {
  background: #fbfcfe;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--rail-blue);
  color: #fff;
  box-shadow: 0 1px 2px rgba(29, 78, 216, 0.2);
}

.btn-primary:hover {
  background: var(--rail-blue-800);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-medium);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background: var(--bg-subtle);
  color: var(--navy-900);
  border-color: var(--border-strong);
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-light);
  background: var(--bg-surface);
  padding: 2rem 2rem;
  text-align: center;
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: auto;
}

.site-footer p {
  line-height: 1.8;
}

.site-footer a {
  color: var(--rail-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}