/* 
 * 付速建站 - 全局样式表
 * 复古像素风格 - 复古红 + 复古蓝 + 复古黄
 * 纯 CSS3 实现，无框架依赖
 */

/* ==================== CSS Reset & 基础设置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.6;
    color: #2c1810;
    background-color: #f5f0e8;
    overflow-x: hidden;
    position: relative;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul, ol {
    list-style: none;
}

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

/* ==================== 颜色变量 ==================== */
:root {
    --retro-red: #c41e3a;
    --retro-blue: #1e3a8a;
    --retro-yellow: #fbbf24;
    --retro-cream: #fef3c7;
    --retro-brown: #78350f;
    --retro-dark: #1f2937;
    --retro-light: #f9fafb;
    --pixel-border: 4px;
}

/* ==================== 通用工具类 ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.text-center {
    text-align: center;
}

.pixel-border {
    border: var(--pixel-border) solid var(--retro-dark);
    box-shadow: 6px 6px 0 var(--retro-dark);
}

.pixel-btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--retro-red);
    color: white;
    font-weight: bold;
    border: var(--pixel-border) solid var(--retro-dark);
    box-shadow: 4px 4px 0 var(--retro-dark);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    font-size: 1rem;
}

.pixel-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--retro-dark);
    background-color: #b91c34;
}

.pixel-btn:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 var(--retro-dark);
}

/* ==================== 滚动渐入动画 ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ==================== 顶部导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(245, 240, 232, 0.95);
    border-bottom: var(--pixel-border) solid var(--retro-dark);
    transition: all 0.3s ease;
}

.header.scrolled {
    background-color: rgba(245, 240, 232, 0.98);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    width: 50px;
    height: 50px;
    border: 3px solid var(--retro-dark);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--retro-red);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    font-weight: bold;
    color: var(--retro-blue);
    padding: 8px 16px;
    border: 2px solid transparent;
    position: relative;
}

.nav-menu a:hover {
    color: var(--retro-red);
    border-color: var(--retro-red);
    background-color: var(--retro-cream);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--retro-dark);
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==================== 页脚 ==================== */
.footer {
    background-color: var(--retro-dark);
    color: var(--retro-light);
    padding: 60px 0 30px;
    border-top: var(--pixel-border) solid var(--retro-brown);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: var(--retro-yellow);
    margin-bottom: 20px;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--retro-yellow);
    padding-bottom: 10px;
    display: inline-block;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: var(--retro-light);
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--retro-yellow);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 2px solid var(--retro-brown);
    color: #9ca3af;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--retro-light);
        flex-direction: column;
        padding: 40px 20px;
        gap: 20px;
        transition: left 0.3s ease;
        border-top: var(--pixel-border) solid var(--retro-dark);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .section {
        padding: 50px 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .header-inner {
        padding: 10px 15px;
    }
}