/* 新概念Ai统一UI设计规范 V2.0 */
:root {
    --primary: #8b5cf6;
    --primary-dark: #7c3aed;
    --primary-light: #a78bfa;
    --primary-gradient: linear-gradient(135deg, #8b5cf6, #7c3aed);
    --secondary: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow: 0 1px 3px 0 rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: all 0.2s ease;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-family); font-size: 16px; line-height: 1.6; color: var(--text-primary); background: var(--bg-secondary); -webkit-font-smoothing: antialiased; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 8px 24px; font-size: 14px; font-weight: 600; border: none; border-radius: 8px; cursor: pointer; transition: var(--transition); text-decoration: none; white-space: nowrap; }
.btn-primary { background: var(--primary-gradient); color: white; box-shadow: var(--shadow-md); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-primary); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 12px 32px; font-size: 16px; }
.btn-sm { padding: 4px 16px; font-size: 12px; }
.w-full { width: 100%; }
.card { background: var(--bg-primary); border-radius: var(--border-radius); box-shadow: var(--shadow); overflow: hidden; transition: var(--transition); }
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card-body { padding: 24px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.text-sm { font-size: 14px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }
.text-3xl { font-size: 30px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 24px; }
.mb-5 { margin-bottom: 32px; }
.mt-4 { margin-top: 24px; }
.p-4 { padding: 16px; }
.p-5 { padding: 24px; }
.badge { display: inline-block; padding: 2px 8px; font-size: 12px; font-weight: 600; border-radius: 9999px; }
.badge-primary { background: #ede9fe; color: var(--primary); }
.form-group { margin-bottom: 16px; }
.form-label { display: block; margin-bottom: 4px; font-weight: 600; font-size: 14px; }
.form-input, .form-select, .form-textarea { width: 100%; padding: 8px 16px; font-size: 14px; border: 1px solid var(--border-color); border-radius: 8px; transition: var(--transition); background: white; color: var(--text-primary); }
.form-input:focus, .form-select:focus, .form-textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(139,92,246,0.1); }
.navbar { background: white; box-shadow: var(--shadow-sm); position: sticky; top: 0; z-index: 1000; }
.navbar-container { max-width: 1200px; margin: 0 auto; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.navbar-brand { font-size: 20px; font-weight: 800; background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; text-decoration: none; }
.navbar-menu { display: flex; gap: 16px; list-style: none; }
.navbar-link { color: var(--text-secondary); text-decoration: none; font-size: 14px; font-weight: 500; transition: var(--transition); padding: 8px 16px; border-radius: 8px; }
.navbar-link:hover, .navbar-link.active { color: var(--primary); background: #f5f3ff; }
.footer { background: var(--gray-900); color: var(--gray-400); padding: 48px 0 24px; margin-top: 48px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; margin-bottom: 32px; }
.footer-title { color: white; font-weight: 600; margin-bottom: 16px; font-size: 16px; }
.footer-link { display: block; color: var(--gray-400); text-decoration: none; font-size: 14px; margin-bottom: 8px; transition: var(--transition); }
.footer-link:hover { color: var(--primary-light); }
.footer-bottom { border-top: 1px solid var(--gray-800); padding-top: 24px; text-align: center; font-size: 14px; }
@media (max-width: 768px) { .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; } .navbar-menu { display: none; } }