/* ========== 新设计方案 - 高级科技风格 ========== */

/* 设计理念：克制的高级感 - 大留白 + 微妙渐变 + 毛玻璃效果 */

:root {
    /* 配色方案 */
    --bg-dark: #0f172a;           /* 深空蓝底色 */
    --bg-card: rgba(30, 41, 59, 0.6); /* 卡片背景 */
    --accent-primary: #06b6d4;    /* 青色主色调 */
    --accent-secondary: #8b5cf6;  /* 紫色辅助色 */
    --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
    --text-primary: #f8fafc;      /* 主文字 */
    --text-secondary: #94a3b8;    /* 次要文字 */
    --text-muted: #64748b;        /* 弱化文字 */
    --border-color: rgba(148, 163, 184, 0.1);
    --border-light: rgba(6, 182, 212, 0.2);
    
    /* 间距系统 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 背景装饰 */
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.bg-decoration::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.bg-decoration::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -15%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--space-sm) 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.navbar:hover,
.navbar.scrolled {
    background: rgba(15, 23, 42, 0.9);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.navbar-logo i {
    color: var(--accent-primary);
    -webkit-text-fill-color: var(--accent-primary);
}

.navbar-links {
    display: flex;
    gap: var(--space-xl);
    list-style: none;
}

.navbar-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast);
}

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

.navbar-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition-normal);
}

.navbar-links a:hover::after,
.navbar-links a.active::after {
    width: 100%;
}

/* 移动端菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--space-sm);
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Hero区域 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent-primary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.hero-title span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: var(--space-lg);
    border: 3px solid var(--border-light);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.15);
    overflow: hidden;
    position: relative;
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-avatar::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: var(--accent-gradient);
    opacity: 0.3;
    animation: pulse 3s ease-in-out infinite;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--accent-primary);
    border-bottom: 2px solid var(--accent-primary);
    transform: rotate(45deg);
}

/* 按钮样式 */
.btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: rgba(6, 182, 212, 0.05);
}

/* 文章列表 */
.articles-section {
    padding: var(--space-2xl) var(--space-lg);
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

.articles-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.article-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-light);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.article-card-image {
    height: 200px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-card-image .tag {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    padding: 0.25rem 0.75rem;
    background: rgba(15, 23, 42, 0.8);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.article-card-content {
    padding: var(--space-lg);
}

.article-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
    text-decoration: none;
    display: block;
    transition: color var(--transition-fast);
}

.article-card-title:hover {
    color: var(--accent-primary);
}

.article-card-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.article-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-card-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: var(--space-md);
    transition: all var(--transition-fast);
}

.read-more:hover {
    gap: 0.75rem;
}

/* 关于区域 */
.about-section {
    padding: var(--space-2xl) var(--space-lg);
    position: relative;
    z-index: 1;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.about-text p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.8;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: 0.85rem;
    color: var(--accent-primary);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: rgba(6, 182, 212, 0.2);
    transform: translateY(-2px);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.stat-item {
    text-align: center;
    padding: var(--space-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

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

/* 页脚 */
.footer {
    padding: var(--space-xl) var(--space-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
}

.footer-logo i {
    color: var(--accent-primary);
    -webkit-text-fill-color: var(--accent-primary);
}

.footer-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.footer-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

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

.footer-copyright {
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.15;
        transform: scale(1.1);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

@keyframes animateOnScroll {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll.visible {
    animation: animateOnScroll 0.6s ease-out forwards;
}

/* Toast提示 */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-lg);
    color: var(--text-primary);
    font-size: 0.9rem;
    z-index: 1000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== 前端发展史 - 全屏场景背景（随时代联动变色，整页背景） ===== */
.scene-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: linear-gradient(160deg, #1c1c24 0%, #0c0c12 100%);
    /* 颜色由 JS 逐帧插值过渡，已足够平滑 */
}

/* ===== 左侧浮动小组件（无边框，不铺满主页） ===== */
.history-widget {
    position: fixed;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 250px;
    height: 380px;
    z-index: 60;
    pointer-events: none;
}

.history-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* 组件旁的旁白字幕（无框） */
.history-caption {
    position: fixed;
    left: 284px;
    top: 50%;
    transform: translateY(-50%);
    width: 220px;
    text-align: left;
    z-index: 60;
    pointer-events: none;
}

.animation-year {
    font-size: 1.7rem;
    font-weight: 800;
    color: #fff;
    line-height: 1;
    letter-spacing: 2px;
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.6);
    transition: opacity 0.5s ease;
}

.animation-subtitle {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin: 6px 0 8px;
    letter-spacing: 1px;
    text-shadow: 0 2px 14px rgba(0, 0, 0, 0.55);
    transition: color 0.6s ease, opacity 0.5s ease;
}

.animation-text {
    font-size: 0.86rem;
    font-weight: 500;
    color: #e2e8f0;
    line-height: 1.55;
    text-shadow: 0 2px 16px rgba(0, 0, 0, 0.6);
    transition: opacity 0.5s ease;
}

/* 进度点 */
.history-progress {
    position: absolute;
    left: 50%;
    bottom: 2px;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
    z-index: 2;
    pointer-events: none;
}

.history-progress .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    transition: all 0.4s ease;
}

.history-progress .dot.active {
    background: var(--accent-primary);
    box-shadow: 0 0 8px var(--accent-primary);
    transform: scale(1.4);
}

/* 重播按钮 */
.animation-replay {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.15);
    border: 1px solid var(--border-light);
    color: var(--accent-primary);
    font-size: 0.78rem;
    cursor: pointer;
    z-index: 3;
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
}

.animation-replay:hover {
    background: rgba(6, 182, 212, 0.3);
    transform: rotate(-90deg);
}

.animation-replay.visible {
    opacity: 1;
    pointer-events: auto;
}

@media (max-width: 768px) {
    .history-widget,
    .history-caption {
        display: none;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar-links {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        padding: var(--space-xl) 0;
        gap: var(--space-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-normal);
        border-bottom: 1px solid var(--border-color);
    }
    
    .navbar-links.active {
        transform: translateY(0);
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: var(--space-md);
    }
}

@media (max-width: 480px) {
    .hero-avatar {
        width: 100px;
        height: 100px;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .article-card-image {
        height: 160px;
    }
}