/* ============================================
   世界统一 WorldUnity - 主题样式
   ============================================ */

:root {
  color-scheme: dark;
  /* 主色系统 */
  --color-primary: #1a4b8c;
  --color-primary-light: #2a6bbf;
  --color-primary-dark: #0d2f5c;
  --color-accent: #f5a623;
  --color-accent-light: #ffc857;
  --color-success: #2ecc71;
  --color-success-light: #58d68d;
  --color-danger: #e74c3c;
  --color-info: #3498db;

  /* 表面系统 */
  --color-background: #0a1628;
  --color-background-2: #0d1d33;
  --color-surface: #13243d;
  --color-surface-hover: #1a3050;
  --color-surface-2: #1a2f52;

  /* 文字系统 */
  --color-text: #f0f4f8;
  --color-text-secondary: #b8c9de;
  --color-muted-text: #6b85a6;
  --color-text-on-accent: #0a1628;

  /* 边框与分割 */
  --color-border: #1e3a5f;
  --color-border-light: #254a73;

  /* 光晕效果 */
  --glow-primary: rgba(26, 75, 140, 0.4);
  --glow-accent: rgba(245, 166, 35, 0.3);
  --glow-success: rgba(46, 204, 113, 0.3);

  /* 焦点 */
  --color-focus: #f5a623;

  /* 字体 */
  --font-body: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* 圆角 */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;

  /* 间距 */
  --space-unit: 0.25rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* 内容宽度 */
  --content-width: 76rem;
  --content-width-narrow: 48rem;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--glow-primary);

  /* 层级 */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;

  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(ellipse at top, rgba(26, 75, 140, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(245, 166, 35, 0.05) 0%, transparent 40%),
    var(--color-background);
}

/* 星空背景装饰 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 60% 70%, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(1px 1px at 80% 20%, rgba(255, 255, 255, 0.25), transparent),
    radial-gradient(1px 1px at 40% 90%, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(1px 1px at 90% 60%, rgba(255, 255, 255, 0.15), transparent);
  background-size: 100% 100%;
  pointer-events: none;
  z-index: 0;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

a {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 var(--space-4);
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-secondary);
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  left: 1rem;
  position: fixed;
  top: 1rem;
  transform: translateY(-200%);
  z-index: 100;
  background: var(--color-accent);
  color: var(--color-text-on-accent);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   通用组件
   ============================================ */

/* 容器 */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: var(--content-width-narrow);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: var(--color-text-on-accent);
  box-shadow: 0 4px 14px var(--glow-accent);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--glow-accent);
  color: var(--color-text-on-accent);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-outline:hover {
  background: rgba(245, 166, 35, 0.1);
  color: var(--color-accent-light);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--radius-full);
}

/* 卡片 */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-normal);
}

.card-hover:hover {
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-accent {
  border-top: 3px solid var(--color-accent);
}

/* 徽章 */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
}

.badge-primary {
  background: rgba(26, 75, 140, 0.3);
  color: var(--color-primary-light);
  border: 1px solid var(--color-primary);
}

.badge-accent {
  background: rgba(245, 166, 35, 0.15);
  color: var(--color-accent);
  border: 1px solid rgba(245, 166, 35, 0.3);
}

.badge-success {
  background: rgba(46, 204, 113, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(46, 204, 113, 0.3);
}

.badge-info {
  background: rgba(52, 152, 219, 0.15);
  color: var(--color-info);
  border: 1px solid rgba(52, 152, 219, 0.3);
}

/* 表单 */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  font-family: inherit;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238fa3bf' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: 2.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

/* 进度条 */
.progress-bar {
  height: 8px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-success) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* 统计数字 */
.stat-number {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-muted-text);
  margin-top: var(--space-1);
}

/* 标签云 */
.tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin: var(--space-1);
  transition: all var(--transition-fast);
}

.tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* 分隔线 */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

/* 文字工具类 */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-muted-text); }
.text-success { color: var(--color-success); }
.font-bold { font-weight: 700; }

/* 弹性布局工具 */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.flex-wrap { flex-wrap: wrap; }

/* 网格工具 */
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ============================================
   顶部导航
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 22, 40, 0.8);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  height: 4.5rem;
  gap: var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.brand-logo {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: 50%;
  color: var(--color-text-on-accent);
  font-weight: 800;
  font-size: 1.125rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--color-muted-text);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.main-nav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.main-nav a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
}

.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.nav-dropdown {
  position: relative;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-2);
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.nav-toggle:hover {
  background: var(--color-surface);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

@media (max-width: 1200px) {
  .main-nav {
    display: none;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-6);
    gap: var(--space-2);
  }

  .main-nav.open a {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle {
    display: flex;
    order: -1;
  }
}

@media (max-width: 640px) {
  .header-actions .btn {
    display: none;
  }

  .brand-sub {
    display: none;
  }
}

/* ============================================
   页面结构
   ============================================ */

.page-main {
  position: relative;
  z-index: 1;
}

/* 页面英雄区 */
.page-hero {
  padding: var(--space-20) 0 var(--space-16);
  text-align: center;
  position: relative;
}

.page-hero h1 {
  margin-bottom: var(--space-4);
}

.page-hero .hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 36rem;
  margin: 0 auto var(--space-8);
}

.hero-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 50%, var(--color-success-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 页面内容区 */
.section {
  padding: var(--space-16) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header h2 {
  margin-bottom: var(--space-3);
}

.section-header p {
  font-size: 1.0625rem;
  max-width: 40rem;
  margin: 0 auto;
}

/* ============================================
   页脚
   ============================================ */

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-6);
  margin-top: var(--space-20);
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer-brand p {
  color: var(--color-muted-text);
  font-size: 0.9375rem;
  margin-top: var(--space-4);
  max-width: 20rem;
}

.footer-col h4 {
  font-size: 0.9375rem;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: var(--space-2);
}

.footer-col a {
  color: var(--color-muted-text);
  font-size: 0.875rem;
}

.footer-col a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--color-muted-text);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social a {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  color: var(--color-muted-text);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: var(--color-text-on-accent);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 500px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* ============================================
   动画
   ============================================ */

@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-pulse {
  animation: pulse-glow 2s ease-in-out infinite;
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .section {
    padding: var(--space-12) 0;
  }

  .page-hero {
    padding: var(--space-16) 0 var(--space-12);
  }
}