/* ========================================
   塔坤建站 - 全局样式文件
   复古像素风格 | 硬核简约设计
   ======================================== */

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

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

body {
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.6;
    color: #2c1810;
    background-color: #f4e4d0;
    overflow-x: hidden;
    position: relative;
}

/* 复古配色变量 */
:root {
    --retro-red: #c44536;
    --retro-blue: #3d5a80;
    --retro-yellow: #eeb850;
    --retro-cream: #f4e4d0;
    --retro-dark: #2c1810;
    --retro-light: #fff8f0;
    --pixel-border: 4px;
}

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

/* ========================================
   导航栏样式
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(244, 228, 208, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: var(--pixel-border) solid var(--retro-dark);
    transition: all 0.3s ease;
    padding: 15px 0;
}

.navbar.scrolled {
    background: rgba(196, 69, 54, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--retro-red);
    text-decoration: none;
    letter-spacing: 2px;
    text-transform: uppercase;
    border: 3px solid var(--retro-dark);
    padding: 8px 16px;
    background: var(--retro-yellow);
    transition: all 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
    background: var(--retro-red);
    color: var(--retro-light);
}

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

.nav-link {
    color: var(--retro-dark);
    text-decoration: none;
    font-weight: bold;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 8px 16px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--retro-red);
    transition: width 0.3s ease;
}

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

.nav-link:hover {
    color: var(--retro-red);
}

.nav-link.active {
    background: var(--retro-red);
    color: var(--retro-light);
    border-color: var(--retro-dark);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 30px;
    height: 3px;
    background: var(--retro-dark);
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   页脚样式
   ======================================== */
.footer {
    background: var(--retro-dark);
    color: var(--retro-cream);
    padding: 60px 0 30px;
    border-top: var(--pixel-border) solid var(--retro-red);
    margin-top: 80px;
}

.footer-content {
    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: 18px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.footer-section p,
.footer-section a {
    color: var(--retro-cream);
    text-decoration: none;
    line-height: 2;
    font-size: 14px;
    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 rgba(255, 255, 255, 0.1);
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
}

/* ========================================
   通用组件样式
   ======================================== */
/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--retro-red);
    color: var(--retro-light);
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 3px solid var(--retro-dark);
    transition: all 0.3s ease;
    cursor: pointer;
    font-family: inherit;
}

.btn:hover {
    background: var(--retro-blue);
    transform: translateY(-3px);
    box-shadow: 4px 4px 0 var(--retro-dark);
}

.btn-secondary {
    background: var(--retro-yellow);
    color: var(--retro-dark);
}

/* 卡片 */
.card {
    background: var(--retro-light);
    border: 3px solid var(--retro-dark);
    padding: 25px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 6px 6px 0 var(--retro-dark);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border: 2px solid var(--retro-dark);
    margin-bottom: 15px;
}

.card-title {
    font-size: 18px;
    color: var(--retro-dark);
    margin-bottom: 10px;
    text-transform: uppercase;
}

.card-text {
    color: #666;
    font-size: 14px;
    line-height: 1.8;
}

/* 标题样式 */
.section-title {
    font-size: 36px;
    color: var(--retro-dark);
    text-align: center;
    margin-bottom: 50px;
    text-transform: uppercase;
    letter-spacing: 3px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--retro-red);
    margin: 20px auto 0;
}

/* ========================================
   动画效果
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--retro-cream);
        flex-direction: column;
        padding: 30px;
        gap: 15px;
        transition: left 0.3s ease;
        border-bottom: var(--pixel-border) solid var(--retro-dark);
    }

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

    .section-title {
        font-size: 28px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

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

    .logo {
        font-size: 22px;
        padding: 6px 12px;
    }

    .btn {
        padding: 10px 20px;
    }
}