/* 全局样式 */
:root {
    --primary-color: #c8102e;      /* 中国红 */
    --secondary-color: #d4af37;    /* 金色 */
    --dark-bg: #1a1a1a;
    --dark-text: #e0e0e0;
    --light-bg: #f5f5f5;
    --light-text: #333;
    --border-color: #444;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--dark-bg);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

.nav-brand {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: 2px;
}

.nav-subtitle {
    font-size: 0.9rem;
    color: var(--secondary-color);
    opacity: 0.8;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--dark-text);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.nav-lang {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-lang-sep {
    opacity: 0.6;
    user-select: none;
}

.nav-lang-label {
    margin-right: 0.5rem;
    white-space: nowrap;
}

.nav-lang-select {
    background: rgba(255,255,255,0.08);
    color: var(--dark-text);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.35rem 0.5rem;
    font-size: 0.9rem;
    cursor: pointer;
    min-width: 8rem;
}

.nav-lang-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark-text);
    transition: var(--transition);
}

/* 英雄区域 */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d1b1b 50%, #1a1a1a 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y="50" font-size="50" fill="rgba(200,16,46,0.05)">華</text></svg>') repeat;
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, transparent 0%, rgba(26, 26, 26, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    letter-spacing: 8px;
}

.hero-subtitle {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-tagline {
    font-size: 1.2rem;
    color: var(--dark-text);
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 4px;
    transition: var(--transition);
    font-weight: 500;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #a00d24;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: transparent;
    color: var(--dark-text);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* 章节样式 */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--secondary-color);
}

/* 特色卡片 */
.features {
    background: var(--dark-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.feature-card p {
    color: var(--dark-text);
    opacity: 0.9;
    line-height: 1.8;
}

/* 理念区域 */
.philosophy {
    background: linear-gradient(135deg, #2d1b1b 0%, #1a1a1a 100%);
}

.philosophy-content {
    max-width: 800px;
    margin: 0 auto;
}

.philosophy-text {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.philosophy-text .lead {
    font-size: 1.5rem;
    color: var(--secondary-color);
    text-align: center;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.philosophy-text ul {
    list-style: none;
    padding-left: 0;
}

.philosophy-text li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.philosophy-text li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* 开发日志预览 */
.latest-devlog {
    background: var(--dark-bg);
}

.devlog-preview {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.devlog-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.devlog-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.devlog-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.devlog-item .date {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.devlog-item p {
    color: var(--dark-text);
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: #0f0f0f;
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--dark-text);
    text-decoration: none;
    transition: var(--transition);
    opacity: 0.8;
}

.footer-section a:hover {
    color: var(--primary-color);
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--dark-text);
    opacity: 0.6;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--dark-bg);
        width: 100%;
        padding: 2rem;
        transition: var(--transition);
        border-top: 1px solid var(--border-color);
    }

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

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    section {
        padding: 50px 0;
    }
}

/* 页面内容样式 */
.page-content {
    margin-top: 80px;
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 2rem;
}

.content-section h3 {
    color: var(--secondary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-section ul,
.content-section ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-section li {
    margin-bottom: 0.5rem;
}

/* 代码块样式 */
code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

pre {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    border-left: 4px solid var(--primary-color);
}

pre code {
    background: none;
    padding: 0;
}

/* 开发日志列表样式 */
.devlog-list {
    margin-top: 2rem;
}

.devlog-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.devlog-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.devlog-item h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.devlog-content {
    margin-top: 1.5rem;
}

.devlog-content h3 {
    color: var(--secondary-color);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.devlog-content h4 {
    color: var(--primary-color);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.devlog-content ul,
.devlog-content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.devlog-content li {
    margin-bottom: 0.5rem;
    line-height: 1.8;
}