/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Minimalist */
    --color-primary: #2c3e50;
    --color-secondary: #34495e;
    --color-accent: #3498db;
    --color-text: #2c3e50;
    --color-text-light: #7f8c8d;
    --color-text-lighter: #95a5a6;
    --color-background: #ffffff;
    --color-background-light: #f8f9fa;
    --color-border: #ecf0f1;
    --color-shadow: rgba(44, 62, 80, 0.1);

    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 4rem;

    /* Layout */
    --max-width: 800px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --line-height-relaxed: 1.6;
    --line-height-loose: 1.8;
}

/* Base Typography */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-4xl) 0 var(--spacing-3xl);
    position: relative;
    overflow: hidden;
}

.avatar {
    margin-bottom: var(--spacing-xl);
}

.avatar-modern {
    width: 100px;
    height: 100px;
    border-radius: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 3px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    transform-style: preserve-3d;
    perspective: 1000px;
}

.avatar-modern:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.avatar-text {
    font-size: 2.5rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: -0.05em;
}

/* Alternative designs - uncomment to use */

/* Option 1: Geometric Avatar */
/*
.avatar-modern {
    width: 100px;
    height: 100px;
    background: var(--color-primary);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
    box-shadow: 0 8px 25px var(--color-shadow);
    transition: all 0.3s ease;
}

.avatar-modern:hover {
    transform: rotate(5deg) scale(1.05);
}

.avatar-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 600;
    color: white;
}
*/

/* Option 2: Minimalist Square */
/*
.avatar-modern {
    width: 80px;
    height: 80px;
    background: var(--color-accent);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    box-shadow: 0 4px 16px var(--color-shadow);
    transition: all 0.3s ease;
}

.avatar-modern:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--color-shadow);
}

.avatar-text {
    font-size: 1.8rem;
    font-weight: 600;
    color: white;
}
*/

/* Option 3: No Avatar - Text Only Layout */
/*
.avatar {
    display: none;
}

.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0 var(--spacing-3xl);
}

.name {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}
*/

.name {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.025em;
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.description {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: var(--line-height-loose);
    max-width: 500px;
    margin: 0 auto;
}

/* Navigation */
.navigation {
    margin-bottom: var(--spacing-4xl);
    text-align: center;
}

.nav-list {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    position: relative;
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-accent);
    background-color: rgba(52, 152, 219, 0.1);
    transform: translateY(-2px) scale(1.05);
}

.nav-link:active {
    transform: translateY(0) scale(0.98);
    transition: all 0.1s ease;
}

/* Sections */
.section {
    margin-bottom: var(--spacing-4xl);
    scroll-margin-top: var(--spacing-xl);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
}

/* Content */
.content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
    line-height: var(--line-height-loose);
}

.content p:last-child {
    margin-bottom: 0;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.skill-item {
    padding: var(--spacing-xl);
    background: var(--color-background-light);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    transform-style: preserve-3d;
    perspective: 1000px;
    position: relative;
    overflow: hidden;
}

.skill-item:hover {
    transform: translateY(-4px) rotateX(5deg) rotateY(5deg);
    box-shadow: 0 12px 35px var(--color-shadow);
}

.skill-item h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.skill-item p {
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.project-card {
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all 0.4s ease;
    transform-style: preserve-3d;
    perspective: 1000px;
}

.project-card:hover {
    transform: translateY(-8px) rotateX(3deg) scale(1.02);
    box-shadow: 0 20px 50px var(--color-shadow);
}

.project-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    position: relative;
    overflow: hidden;
}

.project-image::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius);
}

.project-content {
    padding: var(--spacing-xl);
}

.project-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.project-content p {
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.project-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(52, 152, 219, 0.1);
    color: var(--color-accent);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

/* Contact Section */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-content p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: var(--line-height-loose);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    background: var(--color-background-light);
    transition: all 0.3s ease;
    min-width: 250px;
    justify-content: center;
}

.contact-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: rgba(52, 152, 219, 0.05);
    transform: translateY(-2px);
}

.contact-icon {
    font-size: var(--font-size-lg);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-4xl);
}

.footer p {
    color: var(--color-text-lighter);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.footer-note {
    font-style: italic;
    font-size: var(--font-size-xs);
}

/* 备案信息样式 */
.beian-info {
    margin: var(--spacing-sm) 0;
}

.beian-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--color-text-lighter);
    font-size: var(--font-size-xs);
    transition: all 0.3s ease;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
}

.beian-link:hover {
    color: var(--color-text-light);
    background-color: var(--color-background-light);
}

.beian-icon {
    width: 16px;
    height: 16px;
    object-fit: contain;
    opacity: 0.8;
}

.beian-link:hover .beian-icon {
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.625rem;
        --font-size-2xl: 1.375rem;
        --spacing-4xl: 3rem;
    }

    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .nav-list {
        gap: var(--spacing-md);
        justify-content: center;
    }

    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .avatar-placeholder {
        width: 100px;
        height: 100px;
    }

    .contact-links {
        gap: var(--spacing-sm);
    }

    .contact-link {
        min-width: auto;
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-link {
        display: block;
        text-align: center;
    }
}

/* Smooth Focus Styles */
*:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Animation for Scroll */
@media (prefers-reduced-motion: no-preference) {
    .skill-item,
    .project-card,
    .contact-link {
        opacity: 0;
        transform: translateY(20px);
        animation: slideInUp 0.6s ease forwards;
    }

    .skill-item:nth-child(2) { animation-delay: 0.1s; }
    .skill-item:nth-child(3) { animation-delay: 0.2s; }
    .skill-item:nth-child(4) { animation-delay: 0.3s; }

    .project-card:nth-child(2) { animation-delay: 0.1s; }
    .project-card:nth-child(3) { animation-delay: 0.2s; }

    .contact-link:nth-child(2) { animation-delay: 0.1s; }
    .contact-link:nth-child(3) { animation-delay: 0.2s; }
}

@keyframes slideInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Advanced yet subtle reveal and scene transition */
@media (prefers-reduced-motion: no-preference) {
    /* 通用 reveal 初始态 */
    [data-reveal] {
        opacity: 0;
        transform: translateY(12px);
        transition: opacity 600ms ease, transform 600ms ease;
        will-change: opacity, transform;
    }
    [data-reveal].reveal-visible {
        opacity: 1;
        transform: translateY(0);
    }

    /* 场景过场层 */
    .scene-transition {
        position: fixed;
        inset: 0;
        background: linear-gradient(135deg, rgba(44,62,80,0.96), rgba(52,73,94,0.96));
        pointer-events: none;
        opacity: 0;
        clip-path: circle(0% at 50% 50%);
        z-index: 999;
    }
    .scene-transition.is-active {
        animation: sceneIn 600ms ease forwards;
    }
    .scene-transition.is-out {
        animation: sceneOut 700ms ease forwards;
    }
}

@keyframes sceneIn {
    0% { opacity: 0; clip-path: circle(0% at 50% 50%); }
    60% { opacity: 1; clip-path: circle(140% at 50% 50%); }
    100% { opacity: 1; clip-path: circle(150% at 50% 50%); }
}

@keyframes sceneOut {
    0% { opacity: 1; clip-path: circle(150% at 50% 50%); }
    40% { opacity: 1; clip-path: circle(120% at 50% 50%); }
    100% { opacity: 0; clip-path: circle(0% at 50% 50%); }
}

/* 高级3D动画效果 */
@media (prefers-reduced-motion: no-preference) {
    /* 头像3D旋转动画 - 类似星星但更微妙 */
    .avatar-modern {
        animation: gentleRotate 8s ease-in-out infinite;
    }

    /* 技能卡片3D翻转效果 */
    .skill-item::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(155, 89, 182, 0.05));
        opacity: 0;
        transition: opacity 0.3s ease;
        border-radius: var(--border-radius-lg);
    }

    .skill-item:hover::before {
        opacity: 1;
    }

    /* 项目卡片3D悬浮增强 */
    .project-card {
        will-change: transform;
    }

    /* 导航按钮3D按压效果已在上面定义 */

    /* 背景装饰粒子 */
    .hero::before {
        content: '';
        position: absolute;
        top: 10%;
        right: 15%;
        width: 60px;
        height: 60px;
        background: linear-gradient(45deg, rgba(52, 152, 219, 0.1), rgba(155, 89, 182, 0.1));
        border-radius: 50%;
        animation: float1 6s ease-in-out infinite;
        z-index: -1;
    }

    .hero::after {
        content: '';
        position: absolute;
        bottom: 20%;
        left: 10%;
        width: 40px;
        height: 40px;
        background: linear-gradient(45deg, rgba(155, 89, 182, 0.08), rgba(52, 152, 219, 0.08));
        border-radius: 30%;
        animation: float2 8s ease-in-out infinite reverse;
        z-index: -1;
    }

    /* 联系方式卡片微妙3D效果 */
    .contact-link:hover {
        transform: translateY(-3px) rotateX(2deg);
        box-shadow: 0 8px 25px rgba(52, 152, 219, 0.15);
    }
}

/* 3D动画关键帧 */
@keyframes gentleRotate {
    0%, 100% { transform: rotateY(0deg) rotateX(0deg); }
    25% { transform: rotateY(5deg) rotateX(2deg); }
    50% { transform: rotateY(0deg) rotateX(0deg); }
    75% { transform: rotateY(-5deg) rotateX(-2deg); }
}

@keyframes float1 {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

@keyframes float2 {
    0%, 100% { transform: translateY(0px) rotate(0deg) scale(1); }
    50% { transform: translateY(-15px) rotate(-180deg) scale(1.1); }
}

/* 背景粒子装饰 */
.bg-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -2;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.4;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
}

.particle-1 {
    width: 8px;
    height: 8px;
    background: linear-gradient(45deg, rgba(52, 152, 219, 0.3), rgba(155, 89, 182, 0.3));
    top: 20%;
    left: 10%;
    animation: particleFloat1 12s infinite;
}

.particle-2 {
    width: 12px;
    height: 12px;
    background: linear-gradient(45deg, rgba(155, 89, 182, 0.2), rgba(52, 152, 219, 0.2));
    top: 60%;
    right: 15%;
    animation: particleFloat2 15s infinite reverse;
}

.particle-3 {
    width: 6px;
    height: 6px;
    background: linear-gradient(45deg, rgba(52, 152, 219, 0.25), rgba(155, 89, 182, 0.25));
    bottom: 30%;
    left: 70%;
    animation: particleFloat3 10s infinite;
}

@keyframes particleFloat1 {
    0%, 100% { transform: translateY(0px) translateX(0px) rotate(0deg); }
    25% { transform: translateY(-30px) translateX(20px) rotate(90deg); }
    50% { transform: translateY(-10px) translateX(-15px) rotate(180deg); }
    75% { transform: translateY(-25px) translateX(10px) rotate(270deg); }
}

@keyframes particleFloat2 {
    0%, 100% { transform: translateY(0px) translateX(0px) scale(1); }
    33% { transform: translateY(-40px) translateX(-25px) scale(1.2); }
    66% { transform: translateY(-15px) translateX(30px) scale(0.8); }
}

@keyframes particleFloat3 {
    0%, 100% { transform: translateY(0px) translateX(0px) rotate(0deg) scale(1); }
    50% { transform: translateY(-35px) translateX(-20px) rotate(180deg) scale(1.3); }
}
/* 随滚动旋转的星星背景 */
.scroll-star {
    position: fixed;
    pointer-events: none;
    z-index: 1;
    display: grid;
    place-content: center;
    opacity: 0.8;
}

.scroll-star-main {
    top: 15%;
    right: 5%;
}

.scroll-star-small {
    bottom: 20%;
    left: 3%;
    opacity: 0.7;
}

.scroll-star-test {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 1;
    z-index: 10;
}

.star-svg {
    transform-origin: center;
    drop-shadow: 0 0 8px rgba(52, 152, 219, 0.3);
}

/* 滚动驱动的旋转动画 */
@keyframes scrollSpin {
    to {
        transform: rotateY(5turn) rotateZ(2turn);
    }
}

@keyframes scrollSpinReverse {
    to {
        transform: rotateY(-3turn) rotateZ(-1.5turn);
    }
}

@media (prefers-reduced-motion: no-preference) {
    /* 现代浏览器支持滚动时间线 */
    @supports (animation-timeline: scroll()) {
        .scroll-star-main {
            animation: scrollSpin linear both;
            animation-timeline: scroll();
        }

        .scroll-star-small {
            animation: scrollSpinReverse linear both;
            animation-timeline: scroll();
        }

        .scroll-star-test {
            animation: scrollSpin linear both;
            animation-timeline: scroll();
        }
    }

    /* 降级方案：传统滚动监听 */
    @supports not (animation-timeline: scroll()) {
        .scroll-star {
            transition: transform 0.1s ease-out;
        }
    }
}

/* 为了有足够的滚动距离，确保页面高度 */
body {
    min-height: 200vh;
}


/* Print Styles */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
    }

    .navigation {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}