/* =========================================
   全局样式 (Global Styles)
   所有子页面共享的基础样式
   ========================================= */

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #141414;
    --bg-card: #1a1a1a;
    --bg-card-hover: #222222;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);
    --accent: #8b5cf6;
    --accent-dim: rgba(139, 92, 246, 0.3);
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.2);
    --font-mono: 'Courier New', Courier, monospace;
    --font-sans: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --max-width: 1200px;
    --nav-height: 60px;
    --transition: 0.25s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent);
}

img {
    max-width: 100%;
    display: block;
}

/* --- 顶部导航 --- */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(20px, 4vw, 60px);
}

.site-nav .logo {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--text-primary);
}

.site-nav .logo:hover {
    color: var(--accent);
}

.site-nav .nav-menu {
    display: flex;
    gap: 32px;
    list-style: none;
}

.site-nav .nav-menu a {
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

.site-nav .nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition);
}

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

.site-nav .nav-menu a:hover::after,
.site-nav .nav-menu a.active::after {
    width: 100%;
}

/* 移动端汉堡菜单 */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    margin: 5px 0;
    transition: all 0.3s ease;
}

/* --- 页面主内容区域 --- */
.page-content {
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 80px;
    min-height: 100vh;
}

.page-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 60px);
}

/* --- 页面标题 --- */
.page-header {
    margin-bottom: 48px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-family: var(--font-mono);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* --- 页脚 --- */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 32px clamp(20px, 4vw, 60px);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 1px;
    font-family: var(--font-mono);
}

/* --- Fade In 动画 --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- 滚动条美化 --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* --- 移动端适配 --- */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
        z-index: 1001;
    }

    .site-nav .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 60vw;
        max-width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 24px;
        transition: right 0.35s ease;
        border-left: 1px solid var(--border);
    }

    .site-nav .nav-menu.open {
        right: 0;
    }

    .site-nav .nav-menu a {
        font-size: 1rem;
    }

    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }

    .nav-overlay.open {
        display: block;
    }
}