/* ============================================================
   设计系统 - 深邃星空主题
   ============================================================ */

:root {
  /* 色彩系统 */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a25;
  --color-bg-elevated: #22222f;
  
  --color-text-primary: #f0f0f5;
  --color-text-secondary: #a0a0b0;
  --color-text-muted: #606070;
  
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-glow: rgba(99, 102, 241, 0.3);
  
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  
  --color-border: #2a2a3a;
  --color-border-focus: #4a4a6a;
  
  /* 间距 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);
  
  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* 动画 */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ============================================================
   基础重置
   ============================================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============================================================
   布局
   ============================================================ */

.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl);
  min-height: 100vh;
}

.header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
}

.header p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* ============================================================
   导航
   ============================================================ */

.nav {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  padding: var(--space-xs);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.nav-link {
  padding: var(--space-sm) var(--space-lg);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

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

.nav-link.active {
  color: var(--color-text-primary);
  background: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

/* ============================================================
   表单元素
   ============================================================ */

.input-group {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.input::placeholder {
  color: var(--color-text-muted);
}

.textarea {
  width: 100%;
  min-height: 200px;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-family: var(--font-mono);
  line-height: 1.5;
  resize: vertical;
  transition: all var(--transition-fast);
}

.textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

/* ============================================================
   按钮
   ============================================================ */

.btn {
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

.btn-secondary:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-focus);
}

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

.btn-danger:hover {
  background: var(--color-danger);
  color: white;
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.85rem;
}

.btn-icon {
  padding: var(--space-xs);
  background: transparent;
  color: var(--color-text-muted);
  border: none;
}

.btn-icon:hover {
  color: var(--color-text-primary);
}

/* ============================================================
   卡片
   ============================================================ */

.card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  transition: all var(--transition-fast);
}

.card:hover {
  border-color: var(--color-border-focus);
}

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

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.card-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.card-content {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   响应区域
   ============================================================ */

.response-container {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  min-height: 300px;
}

.response-content {
  font-size: 1rem;
  line-height: 1.8;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.response-content p {
  margin-bottom: var(--space-md);
}

.response-content strong {
  color: var(--color-accent);
}

.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--color-accent);
  margin-left: 2px;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--color-text-muted);
  text-align: center;
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

/* ============================================================
   表格
   ============================================================ */

.table-container {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.table tr:hover td {
  background: var(--color-bg-tertiary);
}

/* ============================================================
   分页
   ============================================================ */

.pagination {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.pagination button {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination button:hover:not(:disabled) {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination .current {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

/* ============================================================
   状态标签
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-active {
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

.badge-inactive {
  background: rgba(160, 160, 176, 0.15);
  color: var(--color-text-muted);
}

/* ============================================================
   模态框
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

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

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  padding: var(--space-xs);
}

.modal-close:hover {
  color: var(--color-text-primary);
}

.modal-body {
  margin-bottom: var(--space-lg);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
}

/* ============================================================
   表单布局
   ============================================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* ============================================================
   空状态
   ============================================================ */

.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.empty-state-title {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

/* ============================================================
   加载状态
   ============================================================ */

.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 640px) {
  .app-container {
    padding: var(--space-md);
  }
  
  .header h1 {
    font-size: 1.5rem;
  }
  
  .nav {
    flex-wrap: wrap;
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}