/* 文明跃迁理论体系官网 - 样式表 */
/* Civitas.top Stylesheet */

/* ===== CSS 变量定义 ===== */
:root {
    /* 主背景色 */
    --bg-primary: #0B1220;
    --bg-secondary: #111A2B;
    --bg-tertiary: #162338;

    /* 文字颜色 */
    --text-primary: #E8EDF5;
    --text-secondary: #B7C2D3;
    --text-muted: #8C98AA;

    /* 强调色 */
    --accent-gold: #C8A96B;
    --accent-gold-dim: rgba(200, 169, 107, 0.3);
    --accent-gold-light: rgba(200, 169, 107, 0.1);

    /* 边框 */
    --border-subtle: rgba(200, 169, 107, 0.2);
    --border-medium: rgba(200, 169, 107, 0.4);

    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 5rem;

    /* 容器宽度 */
    --container-max: 1200px;

    /* 字体 */
    --font-serif: "Noto Serif SC", "PingFang SC", "Microsoft YaHei", serif;
    --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== 全局重置 ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 背景纹理 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: 0.05em;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    letter-spacing: 0.03em;
    margin-bottom: var(--space-lg);
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    margin-bottom: var(--space-sm);
}

h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

a {
    color: var(--accent-gold);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-primary);
}

/* ===== 容器 ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== 导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(11, 18, 32, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.1em;
}

.logo span {
    color: var(--accent-gold);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-menu a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: var(--space-xs) 0;
    position: relative;
    transition: color var(--transition-fast);
}

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

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

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

/* 移动端导航 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ===== 主内容区 ===== */
main {
    padding-top: 70px;
    min-height: calc(100vh - 200px);
}

section {
    padding: var(--space-xxl) 0;
}

/* ===== Hero 区域 ===== */
.hero {
    min-height: calc(100vh - 70px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-xxl) var(--space-md);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-gold-light) 0%, transparent 70%);
    opacity: 0.5;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero h1 {
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-family: var(--font-serif);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-slogan {
    font-size: 1.125rem;
    color: var(--accent-gold);
    font-family: var(--font-serif);
    margin-bottom: var(--space-xl);
    font-style: italic;
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    border: 1px solid var(--accent-gold);
    background: transparent;
    color: var(--accent-gold);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn:hover {
    background: var(--accent-gold);
    color: var(--bg-primary);
}

.btn-primary {
    background: var(--accent-gold);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: transparent;
    color: var(--accent-gold);
}

.btn-sm {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.8rem;
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
}

/* ===== 区块 ===== */
.section-block {
    padding: var(--space-xxl) 0;
    border-bottom: 1px solid var(--border-subtle);
}

.section-block:last-child {
    border-bottom: none;
}

.block-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.block-header h2 {
    position: relative;
    display: inline-block;
}

.block-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: var(--accent-gold);
}

.block-intro {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-secondary);
}

/* ===== 卡片 ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--accent-gold-dim);
    background: var(--bg-tertiary);
}

.card-header {
    margin-bottom: var(--space-md);
}

.card-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.card-type {
    font-size: 0.75rem;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.card-body {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.card-body p {
    font-size: 0.95rem;
    line-height: 1.8;
}

.card-quote {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding-left: var(--space-sm);
    border-left: 2px solid var(--accent-gold-dim);
    margin-bottom: var(--space-md);
}

.card-footer {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ===== 理论层级图 ===== */
.layer-diagram {
    position: relative;
    padding: var(--space-xl) 0;
}

.layer-item {
    position: relative;
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-normal);
}

.layer-item:hover {
    border-color: var(--accent-gold);
}

.layer-number {
    position: absolute;
    left: -40px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gold);
    color: var(--bg-primary);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 0.9rem;
}

.layer-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--accent-gold);
    margin-bottom: var(--space-xs);
}

.layer-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.layer-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.layer-books {
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-subtle);
}

.layer-books span {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 2px 8px;
    background: var(--bg-tertiary);
    margin-right: var(--space-xs);
    margin-bottom: var(--space-xs);
}

/* 连接线 */
.layer-connector {
    position: absolute;
    left: -25px;
    top: 100%;
    width: 2px;
    height: 30px;
    background: var(--accent-gold-dim);
}

.layer-item:last-child .layer-connector {
    display: none;
}

/* ===== 文本卡片 ===== */
.text-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.text-card:hover {
    border-color: var(--accent-gold);
    transform: translateY(-2px);
}

.text-card-header {
    margin-bottom: var(--space-md);
}

.text-card-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
}

.text-card-position {
    font-size: 0.8rem;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.text-card-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.text-card-quote {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-gold);
    margin-bottom: var(--space-md);
}

.text-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-subtle);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.text-card-version {
    font-family: monospace;
}

/* ===== 应用项目卡片 ===== */
.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.project-card:hover {
    border-color: var(--accent-gold);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
}

.project-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
}

.project-type {
    font-size: 0.7rem;
    color: var(--bg-primary);
    background: var(--accent-gold);
    padding: 2px 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-body {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.project-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.project-quote {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-gold);
    margin-bottom: var(--space-md);
}

/* ===== 版本时间线 ===== */
.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border-medium);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 5px;
    width: 10px;
    height: 10px;
    background: var(--bg-primary);
    border: 2px solid var(--accent-gold);
    border-radius: 50%;
}

.timeline-version {
    font-family: monospace;
    font-size: 1rem;
    color: var(--accent-gold);
    margin-bottom: var(--space-xs);
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.timeline-content {
    color: var(--text-secondary);
}

/* ===== 下载列表 ===== */
.download-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-normal);
}

.download-item:hover {
    border-color: var(--accent-gold);
}

.download-info {
    flex: 1;
}

.download-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.download-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.download-action {
    flex-shrink: 0;
}

/* ===== 关于页面 ===== */
.about-section {
    padding: var(--space-xxl) 0;
    border-bottom: 1px solid var(--border-subtle);
}

.about-section:last-child {
    border-bottom: none;
}

.about-section h2 {
    margin-bottom: var(--space-lg);
}

.about-content {
    max-width: 800px;
}

.about-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 2;
    margin-bottom: var(--space-md);
}

.author-card {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
}

.author-avatar {
    width: 80px;
    height: 80px;
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-gold-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--accent-gold);
    flex-shrink: 0;
}

.author-info h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.author-title {
    font-size: 0.9rem;
    color: var(--accent-gold);
    margin-bottom: var(--space-sm);
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
}

.contact-label {
    min-width: 100px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-xl) 0;
    margin-top: var(--space-xxl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-logo {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--text-primary);
}

.footer-logo span {
    color: var(--accent-gold);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--text-muted);
}

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

.footer-bottom {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-subtle);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-slogan {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--accent-gold);
    margin-bottom: var(--space-sm);
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ===== 工具类 ===== */
.text-center {
    text-align: center;
}

.text-gold {
    color: var(--accent-gold);
}

.text-muted {
    color: var(--text-muted);
}

.mb-sm {
    margin-bottom: var(--space-sm);
}

.mb-md {
    margin-bottom: var(--space-md);
}

.mb-lg {
    margin-bottom: var(--space-lg);
}

.mb-xl {
    margin-bottom: var(--space-xl);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    :root {
        --space-xxl: 3rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: var(--space-md);
        gap: 0;
        border-bottom: 1px solid var(--border-subtle);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        border-bottom: 1px solid var(--border-subtle);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: var(--space-sm) 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

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

    .layer-number {
        position: static;
        transform: none;
        margin-bottom: var(--space-sm);
        width: auto;
        height: auto;
        padding: var(--space-xs) var(--space-sm);
    }

    .layer-connector {
        display: none;
    }

    .download-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .download-action {
        width: 100%;
    }

    .download-action .btn {
        width: 100%;
    }

    .author-card {
        flex-direction: column;
        text-align: center;
    }

    .author-avatar {
        margin: 0 auto;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .header, .footer, .btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    main {
        padding-top: 0;
    }
}