/* ============================================
   法规雷达 - 全局样式 (Global Styles)
   莫兰迪配色方案 (Morandi Palette)
   ============================================ */

/* ===== CSS Variables ===== */
:root {
  /* Primary Morandi Colors */
  --morandi-bg-primary: #F5F3F0;
  --morandi-bg-secondary: #EBE7E3;
  --morandi-bg-card: #FAF9F7;

  --morandi-text-primary: #4A4A4A;
  --morandi-text-secondary: #6B6B6B;
  --morandi-text-muted: #8B8680;

  --morandi-accent-blue: #8A9BA8;
  --morandi-accent-blue-light: #B8C4CC;
  --morandi-accent-blue-dark: #6B7B87;

  --morandi-accent-green: #8A9E8D;
  --morandi-accent-green-light: #B5C4B8;
  --morandi-accent-green-dark: #6B7D6E;

  --morandi-border: #D8D4CF;
  --morandi-border-light: #E8E4DF;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Monaco, Inconsolata, "Fira Code", monospace;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);

  /* Layout */
  --header-height: 64px;
  --max-width: 1200px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--morandi-bg-primary);
  color: var(--morandi-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

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

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--morandi-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--morandi-text-muted);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

.fade-in-up {
  animation: fadeInUp 0.5s ease-out;
}

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.page-content {
  padding-top: var(--header-height);
  min-height: 100vh;
}

/* ===== Header / Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--morandi-bg-card);
  border-bottom: 1px solid var(--morandi-border);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 18px;
  font-weight: 600;
  color: var(--morandi-text-primary);
}

.nav-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--morandi-accent-blue), var(--morandi-accent-green));
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-links a {
  color: var(--morandi-text-secondary);
  font-size: 15px;
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  position: relative;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ===== Footer ===== */
.footer {
  background: var(--morandi-bg-secondary);
  border-top: 1px solid var(--morandi-border);
  padding: var(--spacing-xl) 0;
  margin-top: auto;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-text {
  font-size: 13px;
  color: var(--morandi-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.footer-links a {
  font-size: 13px;
  color: var(--morandi-text-muted);
}

.footer-links a:hover {
  color: var(--morandi-text-secondary);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--morandi-accent-blue);
  color: white;
  border-color: var(--morandi-accent-blue);
}

.btn-primary:hover {
  background: var(--morandi-accent-blue-dark);
  border-color: var(--morandi-accent-blue-dark);
  color: white;
}

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

.btn-secondary:hover {
  background: var(--morandi-bg-secondary);
  border-color: var(--morandi-accent-blue-light);
  color: var(--morandi-text-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--morandi-text-muted);
  border: none;
  padding: 8px 12px;
}

.btn-ghost:hover {
  color: var(--morandi-text-primary);
  background: var(--morandi-bg-secondary);
}

.btn-outline {
  background: transparent;
  color: var(--morandi-accent-blue-dark);
  border-color: var(--morandi-accent-blue-light);
}

.btn-outline:hover {
  background: var(--morandi-accent-blue);
  color: white;
  border-color: var(--morandi-accent-blue);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

/* ===== Cards ===== */
.card {
  background: var(--morandi-bg-card);
  border: 1px solid var(--morandi-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--morandi-accent-blue-light);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--morandi-text-primary);
}

.card-body {
  color: var(--morandi-text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--morandi-text-secondary);
  margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--morandi-border);
  border-radius: var(--border-radius-sm);
  font-family: inherit;
  font-size: 14px;
  background: var(--morandi-bg-primary);
  color: var(--morandi-text-primary);
  transition: var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--morandi-accent-blue-light);
  box-shadow: 0 0 0 3px rgba(138, 155, 168, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--morandi-text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-hint {
  font-size: 12px;
  color: var(--morandi-text-muted);
  margin-top: 4px;
}

.form-error {
  font-size: 12px;
  color: #C98B8B;
  margin-top: 4px;
}

/* ===== Badges & Tags ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 500;
}

.badge-blue {
  background: var(--morandi-accent-blue-light);
  color: var(--morandi-accent-blue-dark);
}

.badge-green {
  background: var(--morandi-accent-green-light);
  color: var(--morandi-accent-green-dark);
}

.badge-gray {
  background: var(--morandi-bg-secondary);
  color: var(--morandi-text-muted);
}

/* ===== Loading Skeleton ===== */
.skeleton {
  background: linear-gradient(90deg, var(--morandi-bg-secondary) 25%, var(--morandi-border-light) 50%, var(--morandi-bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}

/* ===== Empty State ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  color: var(--morandi-text-muted);
  text-align: center;
}

.empty-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.4;
}

.empty-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--morandi-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-desc {
  font-size: 14px;
  max-width: 400px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
  }

  .navbar .container {
    padding: 0 var(--spacing-md);
  }

  .nav-links {
    display: none;
  }

  .footer .container {
    flex-direction: column;
    text-align: center;
  }
}