/* ======================================
   UGOOE 全站统一主题 CSS
   设计系统 - 黑色主题 + 绿色主色调
   ====================================== */

/* === CSS变量 === */
:root {
    /* 品牌色 */
    --ugooe-black: #000000;
    --ugooe-dark: #0A0A0A;
    --ugooe-gray: #1A1A1A;
    --ugooe-light-gray: #2A2A2A;
    --ugooe-white: #FFFFFF;
    --ugooe-accent: #10B981;
    --ugooe-accent-light: #34D399;
    --ugooe-accent-dark: #059669;
    --ugooe-gradient: linear-gradient(135deg, #10B981, #3B82F6);
    
    /* 文本 */
    --text-primary: #FFFFFF;
    --text-secondary: #A1A1AA;
    --text-tertiary: #71717A;
    
    /* 边框 */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.05);
    
    /* 背景 */
    --bg-primary: #0A0A0A;
    --bg-secondary: #1A1A1A;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    
    /* 阴影 */
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
    
    /* 圆角 */
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 间距 */
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* 过渡 */
    --transition: 0.3s ease;
}

/* === 基础重置 === */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar-brand a {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--ugooe-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.navbar-link {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
    position: relative;
}

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

.navbar-link.active {
    color: var(--ugooe-accent);
}

.navbar-link.highlight {
    color: var(--ugooe-accent);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* === 按钮系统 === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--ugooe-accent);
}

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

.btn-outline:hover {
    border-color: var(--ugooe-accent);
    color: var(--ugooe-accent);
}

.btn-sm { padding: 6px 16px; font-size: 0.85rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-xl { padding: 18px 40px; font-size: 1.1rem; }

/* === 页面头部 === */
.page-header {
    padding: 120px 0 60px;
    text-align: center;
    background: linear-gradient(180deg, rgba(16,185,129,0.05) 0%, transparent 100%);
}

.page-header h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: var(--ugooe-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* === 内容区 === */
.content-section {
    padding: 60px 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

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

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(16, 185, 129, 0.3);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

/* === 表单 === */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--ugooe-accent);
}

/* === 页脚 === */
.footer {
    background: var(--ugooe-black);
    border-top: 1px solid var(--border-color);
    padding: 64px 0;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    background: var(--ugooe-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-brand .social-links {
    margin-top: 20px;
    display: flex;
    gap: 16px;
}

.footer-brand .social-links a {
    color: var(--text-tertiary);
    font-size: 1.2rem;
    transition: color var(--transition);
}

.footer-brand .social-links a:hover {
    color: var(--ugooe-accent);
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition);
}

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

.footer-bottom {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

/* === 移动端菜单按钮 === */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

/* === 动画 === */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* === 响应式 === */
@media (max-width: 768px) {
    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        border-top: 1px solid var(--border-color);
        padding: 16px;
        gap: 8px;
    }
    
    .navbar-menu.open {
        display: flex;
    }
    
    .navbar-link {
        width: 100%;
        padding: 12px 16px;
    }
    
    .navbar-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .page-header p {
        font-size: 1rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        padding: 100px 0 40px;
    }
}