/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

:root {
    --primary: #00ccff;
    --secondary: #ff0080;
    --bg-dark: #0f0f1a;
    --bg-light: #1a1a2e;
    --bg-card: #16202c;
    --text: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 12px;
}

body {
    background-color: var(--bg-dark);
    color: var(--text);
    line-height: 1.5;
}

body.menu-open {
    overflow: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.gradient-text {
    background: linear-gradient(45deg, var(--secondary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* ===== 头部样式 ===== */
.header {
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    cursor: pointer;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    z-index: 101;
}

/* 移动端导航菜单 - 从左侧滑出 */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-overlay.show {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-menu {
    position: absolute;
    top: 0;
    left: -100%;
    width: 280px;
    height: 100%;
    background: var(--bg-light);
    border-right: 1px solid var(--border);
    padding: 20px;
    transition: left 0.3s ease;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
}

.mobile-nav-overlay.show .mobile-nav-menu {
    left: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.mobile-nav-header h3 {
    color: var(--primary);
    font-size: 18px;
}

.mobile-nav-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 5px;
}

.mobile-nav-list {
    list-style: none;
}

.mobile-nav-item {
    margin-bottom: 5px;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    padding: 12px 15px;
    border-radius: var(--radius);
    transition: 0.2s;
    cursor: pointer;
    width: 100%;
    border: none;
    background: none;
    text-align: left;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: linear-gradient(45deg, var(--secondary), var(--primary));
    color: white;
}

.mobile-nav-link i {
    width: 24px;
    color: var(--primary);
}

.mobile-nav-link:hover i,
.mobile-nav-link.active i {
    color: white;
}

/* ===== 图片加载效果 ===== */
.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lazy-image.loaded {
    opacity: 1;
}

.image-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(110deg, #2a2a3a 8%, #3a3a4a 18%, #2a2a3a 33%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
    border-radius: inherit;
    z-index: 1;
}

@keyframes shimmer {
    0% {
        background-position: 100% 0;
    }
    100% {
        background-position: -100% 0;
    }
}

.image-container {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #2a2a3a;
}

.image-container img {
    position: relative;
    z-index: 2;
}

/* 移动端头部隐藏导航链接，显示菜单按钮 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .header .container {
        justify-content: space-between;
    }

    .header .container > div:last-child {
        display: flex;
        gap: 10px;
        align-items: center;
    }
}

/* ===== 底部样式 ===== */
.footer {
    background: var(--bg-card);
    padding: 30px 0;
    margin-top: 50px;
    border-top: 1px solid var(--border);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 14px;
    text-decoration: none;
}

.copyright {
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.friend-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin: 15px 0;
    padding: 10px 0;
}

.friend-links span {
    color: var(--text-muted);
    font-size: 14px;
}

.friend-links a {
    color: var(--text-secondary);
    font-size: 14px;
    text-decoration: none;
    transition: color 0.2s;
}

.friend-links a:hover {
    color: var(--primary);
}

/* 响应式通用 */
@media (max-width: 480px) {
    .friend-links {
        gap: 10px;
        font-size: 12px;
    }

    .friend-links span,
    .friend-links a {
        font-size: 12px;
    }
}