/* =====================================================
   Design System - 设计系统
   ===================================================== */

:root {
    /* Colors - 明亮清爽主题 */
    /* Colors - 活力年轻主题 */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #fdfcff;
    /* 极淡的蓝紫偏色，增加通透感 */
    --color-bg-tertiary: #f1f5f9;
    --color-bg-card: #ffffff;

    --color-text-primary: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-dark: #4f46e5;

    --color-border: rgba(0, 0, 0, 0.04);
    --color-border-hover: rgba(99, 102, 241, 0.2);

    /* 更具活力的渐变：从亮蓝紫到粉紫 */
    --color-gradient-start: #4338ca;
    --color-gradient-end: #c026d3;

    --color-success: #10b981;
    --color-warning: #f59e0b;

    /* Typography */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows - 适配明亮背景 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* =====================================================
   Reset & Base Styles
   ===================================================== */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Highlight Styles - 极简极客风高亮 */
.highlight {
    position: relative;
    z-index: 1;
    display: inline-block;
    padding: 0 4px;
    font-weight: 600;
}

.highlight::after {
    content: '';
    position: absolute;
    left: -2px;
    bottom: 2px;
    width: calc(100% + 4px);
    height: 45%;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    opacity: 0.25;
    z-index: -1;
    transform: skewX(-15deg);
    transition: var(--transition-base);
}

.highlight:hover::after {
    height: 100%;
    opacity: 0.35;
    transform: skewX(-15deg) scaleX(1.1);
}

.highlight-underline {
    position: relative;
    font-weight: 500;
    color: var(--color-accent-light);
    display: inline-block;
}

.highlight-underline::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    opacity: 0.5;
    transition: var(--transition-base);
}

.highlight-underline:hover::after {
    height: 4px;
    opacity: 0.8;
}

/* =====================================================
   Utility Classes
   ===================================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =====================================================
   Navbar
   ===================================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

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

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-text-primary);
}

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

.nav-cta {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    color: white !important;
    -webkit-text-fill-color: white !important;
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-base);
}

/* =====================================================
   Hero Section
   ===================================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    /* 背景光斑更丰富活跃 */
    background:
        radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.1) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 50%, rgba(192, 38, 211, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 50%);
    animation: bgPulse 10s ease-in-out infinite;
}

@keyframes bgPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: var(--spacing-xl);
}

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

.avatar-placeholder {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg-tertiary), var(--color-bg-secondary));
    border: 3px solid transparent;
    background-clip: padding-box;
    position: relative;
    overflow: hidden;
}

.avatar-placeholder::before {
    content: '';
    position: absolute;
    inset: -3px;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: 50%;
    z-index: -1;
}

.avatar-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    /* === 调整照片显示区域 === */
    /* object-position: X Y; 
       X: 左右位置 (0%=最左, 50%=居中, 100%=最右)
       Y: 上下位置 (0%=最上, 50%=居中, 100%=最下)
       你可以调整这两个值来移动显示区域 */
    object-position: 20% 90%;
    /* transform: scale(X); 放大图片让脸部更突出
       你可以调整这个值：1=原始, 2=放大2倍, 2.5=放大2.5倍 */
    transform: scale(1.5);
}

.avatar-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-tagline {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-tags {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

.tag {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-accent-light);
}

.scroll-indicator {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    animation: fadeInUp 0.8s ease 0.6s forwards, bounce 2s ease-in-out infinite 1.5s;
    opacity: 0;
}

.arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}

/* =====================================================
   About Section
   ===================================================== */

.about {
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.about-text .lead {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    line-height: 1.8;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.highlight-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.highlight-item:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-glow);
}

.highlight-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.highlight-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* =====================================================
   Experience Section - Timeline
   ===================================================== */

.experience {
    background: var(--color-bg-primary);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-gradient-start), var(--color-gradient-end));
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    padding-left: calc(50% + 40px);
}

.timeline-item:nth-child(even) {
    padding-left: 0;
    padding-right: calc(50% + 40px);
    text-align: right;
}

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: 50%;
    box-shadow: var(--shadow-glow);
}

.timeline-content {
    background: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.timeline-content:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
}

.timeline-date {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-accent-light);
    margin-bottom: var(--spacing-sm);
}

.timeline-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    font-size: var(--font-size-sm);
    color: var(--color-accent-light);
    margin-bottom: var(--spacing-sm);
}

.timeline-desc {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

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

.timeline-item:nth-child(even) .timeline-tags {
    justify-content: flex-end;
}

.mini-tag {
    padding: 2px 8px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* =====================================================
   Achievements Section
   ===================================================== */

.achievements {
    background: var(--color-bg-secondary);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.achievement-card {
    background: var(--color-bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.achievement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    opacity: 0;
    transition: var(--transition-base);
}

.achievement-card:hover {
    transform: translateY(-10px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-lg);
}

.achievement-card:hover::before {
    opacity: 1;
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.achievement-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.achievement-desc {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.achievement-year {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 10px;
    border-radius: var(--radius-full);
}

/* =====================================================
   Vision Section
   ===================================================== */

.vision {
    background: var(--color-bg-primary);
    position: relative;
    overflow: hidden;
}

.vision::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.vision-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.vision-project {
    margin-bottom: var(--spacing-2xl);
}

.project-name {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.project-tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

.vision-text {
    text-align: left;
    background: var(--color-bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
}

.vision-text h4 {
    font-size: var(--font-size-lg);
    color: var(--color-accent-light);
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.vision-text h4:first-child {
    margin-top: 0;
}

.vision-text p {
    color: var(--color-text-secondary);
}

.vision-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* =====================================================
   Buttons
   ===================================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* =====================================================
   Contact Section
   ===================================================== */

.contact {
    background: var(--color-bg-secondary);
}

.contact-intro {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    margin-top: calc(var(--spacing-3xl) * -1 + var(--spacing-md));
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-glow);
}

.contact-icon {
    font-size: 2rem;
}

.contact-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.contact-value {
    font-weight: 500;
    color: var(--color-accent-light);
}

.contact-cta {
    text-align: center;
}

/* =====================================================
   Footer
   ===================================================== */

.footer {
    background: var(--color-bg-primary);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer p {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* =====================================================
   Animations for scroll reveal
   ===================================================== */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   Responsive Design
   ===================================================== */

@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .about-highlights {
        flex-direction: row;
        justify-content: center;
    }

    .highlight-item {
        flex: 1;
        max-width: 200px;
    }
}

@media (max-width: 768px) {

    /* Typography */
    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-tagline {
        font-size: var(--font-size-base);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    /* Navigation */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        gap: var(--spacing-xl);
        background: var(--color-bg-primary);
        transition: right var(--transition-base);
    }

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

    .hamburger {
        display: flex;
        z-index: 1001;
    }

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

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

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

    /* Timeline */
    .timeline::before {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-left: 60px;
        padding-right: 0;
        text-align: left;
    }

    .timeline-marker {
        left: 20px;
    }

    .timeline-item:nth-child(even) .timeline-tags {
        justify-content: flex-start;
    }

    /* About highlights */
    .about-highlights {
        flex-direction: column;
    }

    .highlight-item {
        max-width: none;
    }
}

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

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .avatar-placeholder {
        width: 140px;
        height: 140px;
    }

    .highlight-number {
        font-size: var(--font-size-2xl);
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }
}