/* Design System */
:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #10b981;
    --background: #ffffff;
    --surface: #f8fafc;
    --text: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 1px 3px rgba(0,0,0,0.12);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #0f172a;
        --surface: #1e293b;
        --text: #f8fafc;
        --text-secondary: #94a3b8;
    }
}

[data-theme="dark"] {
    --background: #0f172a;
    --surface: #1e293b;
    --text: #f8fafc;
    --text-secondary: #94a3b8;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('images/background.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.3; /* 设置透明度为0.3 */
    z-index: -1; /* 确保叠加层在页面内容下方 */
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter Variable', system-ui, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 导航栏 */
.navbar {
    padding: 1rem 2rem;
    background: rgba(var(--surface-rgb), 0.8);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand h1 {
    font-size: 1.5rem;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.theme-switcher {
    padding: 0.8rem 1.2rem;
    background: var(--secondary);
    color: var(--surface);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.theme-switcher:hover {
    transform: scale(1.02);
    background: var(--primary-hover);
}

/* 主要内容 */
main {
    flex: 1;
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
    overflow: hidden;
    padding: 4rem 0;
    border-radius: var(--radius);
    background: linear-gradient(45deg, var(--surface), var(--background));
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* 功能卡片 */
.card-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        120deg,
        transparent,
        rgba(255,255,255,0.1),
        transparent
    );
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

.card:hover::before {
    left: 100%;
}

.card h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.card p {
    color: var(--text-secondary);
}

/* 时间组件 */
.time-container {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    text-align: center;
    margin: 2rem 0;
    position: relative;
}

.time-container::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    border: 2px solid transparent;
    background: linear-gradient(45deg, var(--primary), var(--secondary)) border-box;
    -webkit-mask: 
        linear-gradient(#fff 0 0) padding-box, 
        linear-gradient(#fff 0 0);
    mask: 
        linear-gradient(#fff 0 0) padding-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

/* 页脚 */
footer {
    background: var(--surface);
    padding: 2rem;
    text-align: center;
    margin-top: auto;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.social-link {
    color: var(--text-secondary);
    transition: var(--transition);
    text-decoration: none;
}

.social-link:hover {
    color: var(--primary);
    transform: translateY(-2px);
}


/* 网络安全警示公告 */
.security-alert {
    background: rgba(255, 165, 0, 0.1);
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    padding: 1rem;
    margin: 2rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.security-alert::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
}

.alert-icon {
    flex-shrink: 0;
    color: var(--primary);
}

.alert-text {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.alert-text:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Telegram服务列表 */
.service-list {
    background: var(--surface);
    border-radius: var(--radius);
    margin: 2rem 0;
    box-shadow: var(--shadow);
    border: 1px solid rgba(var(--text-rgb), 0.1);
}

.service-title {
    padding: 1.2rem 2rem;
    list-style: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text);
    transition: var(--transition);
}

.dropdown-icon {
    transition: transform 0.3s ease;
    fill: var(--text-secondary);
}

.service-list[open] .dropdown-icon {
    transform: rotate(180deg);
}

.service-items {
    padding: 0 2rem;
    border-top: 1px solid rgba(var(--text-rgb), 0.1);
}

.service-item {
    padding: 1.2rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    border-bottom: 1px solid rgba(var(--text-rgb), 0.05);
}

.service-item:last-child {
    border-bottom: none;
}

.service-item span {
    color: var(--text);
    font-size: 0.95rem;
}

.service-item a {
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.service-item a:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .service-title {
        padding: 1rem;
    }
    
    .service-items {
        padding: 0 1rem;
    }
    
    .service-item {
        flex-direction: column;
    }
}

/* 暗色模式适配 */
@media (prefers-color-scheme: dark) {
    .security-alert {
        background: rgba(255, 165, 0, 0.05);
    }
}

[data-theme="dark"] .security-alert {
    background: rgba(255, 165, 0, 0.05);
}