/* Modern RSBilling Theme - Clean Style CSS */

/* CSS变量定义 - 现代化色彩方案 */
:root {
    /* 主色调 - 现代蓝色渐变 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #a4cafe;
    
    /* 辅助色 - 薄荷绿 */
    --secondary-gradient: linear-gradient(135deg, #11cdef 0%, #2af598 100%);
    --secondary-color: #11cdef;
    --secondary-dark: #0ea5e9;
    --secondary-light: #7dd3fc;
    
    /* 中性色 - 现代灰色系（增强对比度） */
    --white: #ffffff;
    --light-bg: #f8fafc;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #374151;
    --gray-700: #1f2937;
    --gray-800: #111827;
    --gray-900: #000000;
    
    /* 强调色 */
    --accent-color: #ff6b6b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 字体 */
    --font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* 边距和尺寸 */
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础样式 */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
    font-weight: 400;
}

/* 现代化容器 */
.modern-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 现代化导航栏 */
.modern-navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.modern-navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.modern-navbar-brand:hover {
    text-decoration: none;
}

.modern-navbar-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.modern-nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.modern-nav-link:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.modern-nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -8px;
    left: 0;
    background: var(--primary-gradient);
    transition: var(--transition);
}

.modern-nav-link:hover::after {
    width: 100%;
}

/* 现代化Hero区域 */
.modern-hero {
    background: var(--primary-gradient);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.modern-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Cpath d='m36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    opacity: 0.1;
}

.modern-hero-content {
    position: relative;
    z-index: 1;
}

.modern-hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.modern-hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: #ffffff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* 现代化按钮 */
.modern-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1.5;
    text-align: center;
}

.modern-btn-primary {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.modern-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-dark);
    text-decoration: none;
}

.modern-btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.modern-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--white);
    text-decoration: none;
}

.modern-btn-success {
    background: var(--success-color);
    color: white;
}

.modern-btn-success:hover {
    background: #059669;
    color: white;
    text-decoration: none;
}

/* 现代化卡片 */
.modern-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.modern-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.modern-card-header {
    padding: 1.5rem;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.modern-card-body {
    padding: 1.5rem;
}

.modern-card-footer {
    padding: 1.5rem;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

/* 现代化特性网格 */
.modern-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 4rem 0;
}

.modern-feature-card {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-base);
    transition: var(--transition);
}

.modern-feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.modern-feature-icon {
    width: 4rem;
    height: 4rem;
    margin: 0 auto 1.5rem;
    background: var(--secondary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
}

.modern-feature h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.modern-feature p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* 工具类 */
.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-muted {
    color: var(--gray-600);
}

/* Bootstrap 5 兼容性 */
.fw-bold {
    font-weight: 700;
}

.font-weight-bold {
    font-weight: 700;
}

.ms-1, .ml-1 {
    margin-left: 0.25rem;
}

.me-2, .mr-2 {
    margin-right: 0.5rem;
}

.mr-3, .me-3 {
    margin-right: 1rem;
}

/* Hero区域文字对比度增强 */
.modern-hero .gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    font-weight: 800;
}

/* Footer文字对比度增强 */
footer {
    background: var(--gray-900);
}

footer h5,
footer h6 {
    color: #ffffff;
}

footer p,
footer .text-muted {
    color: #d1d5db;
}

footer a {
    color: #d1d5db;
}

footer a:hover {
    color: #ffffff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .modern-hero h1 {
        font-size: 2.5rem;
    }
    
    .modern-hero p {
        font-size: 1.125rem;
    }
    
    .modern-features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .modern-navbar-nav {
        gap: 1rem;
    }
    
    .modern-container {
        padding: 0 1rem;
    }
}

/* 按钮尺寸 */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* 间隙处理 */
.gap-3 {
    gap: 1rem;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--border-radius);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

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

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