/* ===========================
   CSS Reset & Variables
   =========================== */
:root {
    /* Color Palette - Sophisticated Professional Theme */
    --primary-color: #0a192f;
    --primary-dark: #020c1b;
    --primary-light: #112240;
    --secondary-color: #64ffda;
    --accent-color: #00d4ff;
    
    --text-primary: #0a192f;
    --text-secondary: #8892b0;
    --text-light: #a8b2d1;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-gray: #e9ecef;
    --bg-dark: #0a192f;
    
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Layout */
    --max-width: 1200px;
    --navbar-height: 70px;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0a192f 0%, #112240 100%);
    --gradient-hero: linear-gradient(135deg, rgba(10, 25, 47, 0.95) 0%, rgba(17, 34, 64, 0.95) 100%);
    --gradient-accent: linear-gradient(135deg, #64ffda 0%, #00d4ff 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(100, 255, 218, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
}

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

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

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

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.875rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.875rem); }
h4 { font-size: 1.25rem; }

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

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

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

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

.section {
    padding: var(--spacing-3xl) 0;
}

.section-gray {
    background-color: var(--bg-gray);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.contact-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
}

.btn-primary:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(100, 255, 218, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255, 255, 255, 0.2);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    height: var(--navbar-height);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

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

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

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

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

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

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('assets/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.15;
    filter: grayscale(30%);
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(100, 255, 218, 0.03)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,106.7C1248,96,1344,96,1392,96L1440,96L1440,0L1392,0C1344,0,1248,0,1152,0C1056,0,960,0,864,0C768,0,672,0,576,0C480,0,384,0,288,0C192,0,96,0,48,0L0,0Z"></path></svg>') no-repeat top;
    background-size: cover;
    pointer-events: none;
}

.hero-decoration {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(100, 255, 218, 0.15) 0%, transparent 70%);
    filter: blur(60px);
    top: 10%;
    right: -150px;
    animation: float 8s ease-in-out infinite;
}

.hero-decoration-2 {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    filter: blur(50px);
    bottom: 10%;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-30px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    color: white;
    max-width: 1100px;
    margin: 0 auto;
}

.hero-text {
    text-align: left;
}

.hero-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image {
    position: relative;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--secondary-color);
    box-shadow: 0 0 40px rgba(100, 255, 218, 0.3), 0 20px 60px rgba(0, 0, 0, 0.4);
    transition: all var(--transition-normal);
}

.hero-image:hover {
    transform: scale(1.05);
    box-shadow: 0 0 60px rgba(100, 255, 218, 0.5), 0 25px 80px rgba(0, 0, 0, 0.5);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50%;
    background: var(--gradient-overlay);
    pointer-events: none;
}

.hero-title {
    color: white;
    margin-bottom: var(--spacing-sm);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    color: var(--secondary-color);
    position: relative;
    display: inline-block;
}

.hero-role {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    margin-bottom: var(--spacing-md);
    color: var(--secondary-color);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-description {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-light);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===========================
   About Section
   =========================== */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.highlight-item {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    border: 1px solid transparent;
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(100, 255, 218, 0.15);
    border-color: var(--secondary-color);
}

.highlight-item i {
    font-size: 2.5rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    filter: drop-shadow(0 2px 4px rgba(100, 255, 218, 0.3));
}

.highlight-item h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.highlight-item p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

/* ===========================
   Education Timeline
   =========================== */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding-left: 2.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--secondary-color) 0%, var(--accent-color) 100%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: -2.75rem;
    top: 0;
    width: 18px;
    height: 18px;
    background: var(--secondary-color);
    border: 4px solid white;
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(100, 255, 218, 0.2);
    z-index: 1;
    transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-marker {
    background: var(--accent-color);
    box-shadow: 0 0 0 6px rgba(0, 212, 255, 0.3);
    transform: scale(1.2);
}

.timeline-marker.special {
    background: var(--secondary-color);
}

.timeline-content {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.timeline-content:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.timeline-content.highlight {
    border: 2px solid var(--secondary-color);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.timeline-header h3 {
    color: var(--primary-color);
    margin: 0;
}

.timeline-institution {
    font-weight: 600;
    color: var(--text-secondary);
    margin: 0.25rem 0 0 0;
    font-size: 1rem;
}

.timeline-date {
    background: var(--bg-gray);
    padding: 0.375rem 1rem;
    border-radius: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
}

.timeline-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.exchange-programs {
    margin-top: var(--spacing-md);
}

.exchange-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

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

.exchange-item i {
    font-size: 1.5rem;
    color: var(--secondary-color);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.exchange-item strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.exchange-item p {
    margin: 0;
    font-size: 0.9375rem;
}

.exchange-detail {
    color: var(--text-light) !important;
    font-size: 0.875rem !important;
    margin-top: 0.25rem !important;
}

/* ===========================
   Experience Section
   =========================== */
.experience-grid {
    display: grid;
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.experience-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(100, 255, 218, 0.15);
    border-left-color: var(--secondary-color);
}

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

.experience-role {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.375rem;
}

.experience-company,
.experience-location {
    color: var(--text-secondary);
    font-weight: 500;
    margin: 0.25rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.experience-company i,
.experience-location i {
    color: var(--text-light);
    font-size: 0.875rem;
}

.experience-date {
    background: var(--bg-gray);
    padding: 0.375rem 1rem;
    border-radius: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
}

.experience-description {
    background: var(--bg-secondary);
    padding: var(--spacing-sm);
    border-radius: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.experience-description p {
    margin: 0;
    font-size: 0.9375rem;
}

.experience-achievements {
    list-style: none;
    margin-bottom: var(--spacing-md);
    padding-left: 0;
}

.experience-achievements li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.experience-achievements li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.25rem;
}

.experience-achievements li strong {
    color: var(--primary-color);
}

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

.tag {
    background: var(--bg-gray);
    color: var(--text-secondary);
    padding: 0.375rem 0.875rem;
    border-radius: 1.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-color);
    color: white;
}

/* ===========================
   Skills Section
   =========================== */
.skills-container {
    display: grid;
    gap: var(--spacing-xl);
}

.skills-category {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
}

.skills-category-title {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
}

.skills-category-title i {
    font-size: 1.75rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-sm);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    transition: all var(--transition-normal);
    cursor: default;
}

.skill-item:hover {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(100, 255, 218, 0.3);
}

.skill-item i {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.skill-item span {
    font-weight: 500;
    font-size: 0.9375rem;
}

/* Soft Skills Grid */
.soft-skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.soft-skill-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.soft-skill-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-accent);
    color: var(--primary-dark);
    border-radius: 0.5rem;
    font-size: 1.5rem;
}

.soft-skill-content h4 {
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    font-size: 1.125rem;
}

.soft-skill-content p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

/* Languages */
.languages-grid {
    display: grid;
    gap: var(--spacing-md);
}

.language-item {
    padding: var(--spacing-sm) 0;
}

.language-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.625rem;
    align-items: center;
}

.language-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-name i {
    color: var(--primary-color);
}

.language-level {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.language-bar {
    height: 10px;
    background: var(--bg-gray);
    border-radius: 1rem;
    overflow: hidden;
}

.language-progress {
    height: 100%;
    background: var(--gradient-accent);
    border-radius: 1rem;
    transition: width 1s ease;
    position: relative;
    overflow: hidden;
}

.language-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.5),
        transparent
    );
    animation: shimmer 2s infinite;
}

/* Interests Grid */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.interest-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    transition: all var(--transition-normal);
}

.interest-item:hover {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(100, 255, 218, 0.3);
}

.interest-item i {
    font-size: 1.25rem;
}

.interest-item span {
    font-weight: 500;
    font-size: 0.9375rem;
}

/* ===========================
   Contact Section
   =========================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: white;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.contact-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    flex-shrink: 0;
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: 0.5rem;
    font-size: 1.5rem;
}

.contact-details h3 {
    font-size: 1.0625rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.contact-details a,
.contact-details p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9375rem;
}

.contact-details a:hover {
    color: var(--primary-color);
}

.qr-section {
    text-align: center;
    background: white;
    padding: var(--spacing-xl);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.qr-title {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.qr-code-container {
    background: white;
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-md);
    border: 2px solid var(--bg-gray);
}

.qr-code-container canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.qr-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.9375rem;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    margin: 0.375rem 0;
    color: rgba(255, 255, 255, 0.9);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
}

.footer-links {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.footer-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: all var(--transition-normal);
}

.footer-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease;
}

.fade-in-up {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.fade-in-up:nth-child(1) { animation-delay: 0.1s; }
.fade-in-up:nth-child(2) { animation-delay: 0.2s; }
.fade-in-up:nth-child(3) { animation-delay: 0.3s; }
.fade-in-up:nth-child(4) { animation-delay: 0.4s; }
.fade-in-up:nth-child(5) { animation-delay: 0.5s; }
.fade-in-up:nth-child(6) { animation-delay: 0.6s; }

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

/* Tablet */
@media (max-width: 968px) {
    :root {
        --spacing-xl: 2.5rem;
        --spacing-2xl: 3.5rem;
        --spacing-3xl: 5rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: var(--navbar-height);
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg) 0;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        padding: var(--spacing-sm) 0;
        width: 100%;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .hero-text {
        text-align: center;
    }
    
    .hero-image-wrapper {
        order: -1;
    }
    
    .hero-image {
        width: 240px;
        height: 240px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 320px;
    }
    
    .timeline {
        padding-left: 2rem;
    }
    
    .timeline-marker {
        left: -2.25rem;
    }
    
    .timeline-header {
        flex-direction: column;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
        --spacing-3xl: 3.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .timeline-content,
    .experience-card,
    .skills-category,
    .contact-item,
    .qr-section {
        padding: var(--spacing-md);
    }
    
    .soft-skills-grid {
        grid-template-columns: 1fr;
    }
    
    .exchange-item {
        flex-direction: column;
        text-align: center;
    }
    
    .interests-grid {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .mobile-menu-toggle,
    .btn,
    .footer,
    .qr-section {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: all var(--transition-normal);
    font-size: 1.25rem;
}

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

.scroll-to-top.visible {
    display: flex;
}