/* ========================================
   唐泽兵个人网站 - 高端大气风格样式
   ======================================== */

/* CSS变量定义 */
:root {
    /* 主色调 - 深蓝科技风 */
    --primary-color: #1a365d;
    --primary-light: #2c5282;
    --primary-dark: #0d1b2a;
    
    /* 强调色 - 金色点缀 */
    --accent-color: #d69e2e;
    --accent-light: #ecc94b;
    --accent-dark: #b7791f;
    
    /* 辅助色 */
    --secondary-color: #2d3748;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-dark: #1a202c;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
    --gradient-accent: linear-gradient(135deg, #d69e2e 0%, #ecc94b 100%);
    --gradient-hero: linear-gradient(135deg, rgba(26, 54, 93, 0.95) 0%, rgba(44, 82, 130, 0.9) 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(214, 158, 46, 0.3);
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

/* 重置样式 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
}

ul {
    list-style: none;
}

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

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

/* 通用区块样式 */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 16px;
    position: relative;
}

.section-tag::before,
.section-tag::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30px;
    height: 1px;
    background: var(--accent-color);
}

.section-tag::before {
    right: calc(100% + 15px);
}

.section-tag::after {
    left: calc(100% + 15px);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--bg-primary);
    border: 2px solid var(--bg-primary);
}

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

.btn-resume {
    background: var(--gradient-accent);
    color: var(--primary-color);
    border: 2px solid var(--accent-color);
    font-weight: 600;
}

.btn-resume:hover {
    background: linear-gradient(135deg, #ecc94b 0%, #d69e2e 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(214, 158, 46, 0.4);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.125rem;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-normal);
    padding: 20px 0;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--bg-primary);
    letter-spacing: 1px;
}

.navbar.scrolled .nav-logo {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--bg-primary);
    position: relative;
    padding: 8px 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition-normal);
}

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

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

.bar {
    width: 25px;
    height: 2px;
    background: var(--bg-primary);
    transition: var(--transition-normal);
}

.navbar.scrolled .bar {
    background: var(--primary-color);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--gradient-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(214, 158, 46, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 20px 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(214, 158, 46, 0.2);
    color: var(--accent-light);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(214, 158, 46, 0.3);
}

.hero-title {
    color: var(--bg-primary);
    margin-bottom: 24px;
}

.title-line {
    display: block;
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 8px;
}

.title-sub {
    display: block;
    font-size: 1.5rem;
    font-weight: 400;
    opacity: 0.9;
}

.ampersand {
    color: var(--accent-color);
    font-weight: 700;
}

.hero-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-frame {
    position: relative;
    width: 400px;
    height: 500px;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 2;
}

.image-decoration {
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    border: 3px solid var(--accent-color);
    border-radius: var(--radius-lg);
    z-index: 1;
}

.image-decoration::before {
    content: '';
    position: absolute;
    top: -40px;
    right: -40px;
    width: 80px;
    height: 80px;
    border: 3px solid var(--accent-color);
    border-radius: 50%;
    opacity: 0.5;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-full);
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-full);
    animation: scroll 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes scroll {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(12px); }
}

/* ========================================
   About Section
   ======================================== */
.about {
    background: var(--bg-secondary);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.stat-card {
    background: var(--bg-primary);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.about-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.info-card {
    background: var(--bg-primary);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.info-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--accent-color);
}

.info-text {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.highlight-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.highlight-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.highlight-list i {
    color: var(--accent-color);
    font-size: 1.25rem;
    margin-top: 2px;
    flex-shrink: 0;
}

.highlight-list span {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Engineering Section
   ======================================== */
.engineering {
    background: var(--bg-primary);
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: 60px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-dark);
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.timeline-header {
    margin-bottom: 20px;
}

.timeline-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.timeline-company {
    display: block;
    font-size: 1rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-location {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-right: 20px;
}

.timeline-date {
    font-size: 0.9375rem;
    color: var(--text-light);
    font-weight: 500;
}

.timeline-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.btn-view-details {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    padding: 8px 0;
    margin-bottom: 24px;
    transition: color 0.3s ease;
}

.btn-view-details:hover {
    color: var(--accent-dark);
}

.btn-view-details i {
    font-size: 0.875rem;
}

.timeline-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

/* ========================================
   Software Section
   ======================================== */
.software {
    background: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    gap: 40px;
}

.project-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.project-card.featured {
    border: 2px solid var(--accent-color);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 30px 40px;
    background: var(--gradient-primary);
    color: var(--bg-primary);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.project-company,
.project-type {
    font-size: 0.9375rem;
    opacity: 0.8;
    margin-right: 16px;
}

.project-date {
    font-size: 0.875rem;
    opacity: 0.7;
}

.project-body {
    padding: 30px 40px;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.feature-list li {
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-list strong {
    color: var(--primary-color);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.project-card .btn-view-details {
    margin-bottom: 20px;
}

.tech-tag {
    background: var(--bg-secondary);
    color: var(--primary-color);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--primary-light);
}

.project-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 0 40px 30px;
}

/* ========================================
   Skills Section
   ======================================== */
.skills {
    background: var(--bg-primary);
}

.skills-content {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.skills-category {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: var(--radius-lg);
}

.category-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.category-title i {
    color: var(--accent-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-primary);
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.skill-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.skill-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.skill-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.skill-level {
    font-size: 0.875rem;
    color: var(--accent-color);
    font-weight: 500;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background: var(--gradient-primary);
    color: var(--bg-primary);
}

.contact .section-title,
.contact .section-subtitle {
    color: var(--bg-primary);
}

.contact .section-tag {
    color: var(--accent-light);
}

.contact .section-tag::before,
.contact .section-tag::after {
    background: var(--accent-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: rgba(255, 255, 255, 0.1);
    padding: 24px;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary-dark);
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.8;
    margin-bottom: 4px;
}

.contact-details p {
    font-size: 1.125rem;
    font-weight: 600;
}

.contact-cta {
    text-align: center;
    padding: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-cta h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-cta p {
    font-size: 1.0625rem;
    opacity: 0.9;
    margin-bottom: 32px;
    line-height: 1.8;
}

.contact-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--bg-dark);
    color: var(--bg-primary);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.footer-brand p {
    opacity: 0.7;
    font-size: 0.9375rem;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    opacity: 0.7;
    font-size: 0.9375rem;
    transition: var(--transition-normal);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    opacity: 0.5;
    font-size: 0.875rem;
}

.footer-bottom .icp-info {
    margin-top: 0.5rem;
}

.footer-bottom .icp-info a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer-bottom .icp-info a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* ========================================
   Gallery & Lightbox
   ======================================== */
.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4/3;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 54, 93, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.gallery-overlay i {
    color: var(--bg-primary);
    font-size: 1.5rem;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 40px;
    font-size: 3rem;
    color: var(--bg-primary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.lightbox-close:hover {
    color: var(--accent-color);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
    color: var(--bg-primary);
    cursor: pointer;
    transition: var(--transition-normal);
    padding: 20px;
    user-select: none;
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

.lightbox-prev:hover,
.lightbox-next:hover {
    color: var(--accent-color);
}

.lightbox-caption {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--bg-primary);
    font-size: 1.125rem;
    text-align: center;
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-accent);
    border: none;
    border-radius: 50%;
    color: var(--primary-dark);
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-image {
        order: -1;
    }
    
    .image-frame {
        width: 300px;
        height: 375px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-info {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .timeline-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .project-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-link {
        color: var(--text-primary);
        padding: 16px;
        border-bottom: 1px solid var(--bg-secondary);
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .title-line {
        font-size: 2.5rem;
    }
    
    .title-sub {
        font-size: 1.125rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-marker {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .timeline-content {
        padding: 24px;
    }
    
    .timeline-gallery {
        grid-template-columns: 1fr 1fr;
    }
    
    .project-header {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }
    
    .project-body {
        padding: 24px;
    }
    
    .project-gallery {
        grid-template-columns: 1fr;
        padding: 0 24px 24px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 24px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .info-card {
        padding: 24px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .image-frame {
        width: 250px;
        height: 312px;
    }
    
    .timeline-gallery {
        grid-template-columns: 1fr;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* ========================================
   Language Switcher
   ======================================== */
.language-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 4px 8px;
    border: 1px solid rgba(214, 158, 46, 0.3);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 16px;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.lang-btn.active {
    color: #1a1a2e;
    background: var(--accent-color);
    box-shadow: 0 2px 8px rgba(214, 158, 46, 0.3);
}

.lang-divider {
    color: var(--text-light);
    font-size: 0.75rem;
    opacity: 0.5;
}

@media (max-width: 768px) {
    .language-switcher {
        margin-left: auto;
        margin-right: 15px;
        padding: 3px 6px;
    }
    
    .lang-btn {
        padding: 4px 8px;
        font-size: 0.8rem;
    }
}