/* ========================================
   CSS Variables & Theme Configuration
======================================== */
:root {
    /* Colors - Light Theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-card: #ffffff;
    --color-bg-card-hover: #f8fafc;

    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #ffffff;

    --color-accent-primary: #2563eb;
    --color-accent-secondary: #3b82f6;
    --color-accent-light: #dbeafe;
    --color-accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px rgb(37 99 235 / 0.15);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* 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;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-tooltip: 500;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #0a0f1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1e293b;
    --color-bg-card: #1e293b;
    --color-bg-card-hover: #334155;

    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #64748b;
    --color-text-inverse: #0f172a;

    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #60a5fa;
    --color-accent-light: #1e3a5f;

    --color-border: #334155;
    --color-border-light: #1e293b;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4), 0 8px 10px -6px rgb(0 0 0 / 0.3);
    --shadow-glow: 0 0 60px rgb(59 130 246 / 0.2);
}

/* ========================================
   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-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========================================
   Container & Layout
======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

@media (min-width: 768px) {
    .section {
        padding: 6rem 0;
    }
}

/* ========================================
   Navigation
======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background-color: transparent;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .navbar.scrolled {
    background-color: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(12px);
}

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

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: none;
    align-items: center;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

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

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

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

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

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.lang-option {
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.lang-option.active {
    color: var(--color-text-inverse);
    background: var(--color-accent-primary);
}

.lang-separator {
    color: var(--color-text-tertiary);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-card-hover);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* Mobile Toggle */
.mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
}

@media (min-width: 768px) {
    .mobile-toggle {
        display: none;
    }
}

.hamburger {
    position: relative;
    width: 20px;
    height: 2px;
    background: currentColor;
    transition: all var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: currentColor;
    transition: all var(--transition-fast);
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    bottom: -6px;
}

.mobile-toggle.active .hamburger {
    background: transparent;
}

.mobile-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-toggle.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* Mobile Menu */
.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-md);
}

[data-theme="dark"] .nav-menu.active {
    background: rgba(10, 15, 26, 0.98);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 var(--spacing-3xl);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--color-border-light) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border-light) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
}

[data-theme="dark"] .hero-grid {
    opacity: 0.15;
}

.hero-glow {
    position: absolute;
    top: -20%;
    right: -10%;
    width: 60%;
    height: 80%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
    filter: blur(60px);
}

[data-theme="dark"] .hero-glow {
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 60%);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (min-width: 1024px) {
    .hero-content {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.hero-text {
    flex: 1;
    max-width: 640px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease forwards;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.6s ease 0.1s forwards;
    opacity: 0;
}

.hero-greeting {
    display: block;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.hero-name {
    display: block;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    min-height: 2.5rem;
    animation: fadeInUp 0.6s ease 0.2s forwards;
    opacity: 0;
}

.typing-cursor {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-description {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.4s forwards;
    opacity: 0;
}

.hero-social {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeInUp 0.6s ease 0.5s forwards;
    opacity: 0;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    transform: translateY(-2px);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    flex-shrink: 0;
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

@media (min-width: 1024px) {
    .hero-visual {
        width: 400px;
    }
}

.profile-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
}

.profile-avatar {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-xl);
}

.avatar-initials {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text-inverse);
    background: var(--color-accent-gradient);
    border-radius: 50%;
}

.avatar-ring {
    position: absolute;
    inset: -8px;
    border: 3px solid var(--color-accent-light);
    border-radius: 50%;
    animation: spin 20s linear infinite;
    border-top-color: var(--color-accent-primary);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    text-align: center;
}

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

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    line-height: 1.3;
}

/* Floating Tags */
.floating-tags {
    display: none;
    position: absolute;
}

@media (min-width: 1024px) {
    .floating-tags {
        display: block;
    }

    .tag {
        position: absolute;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8125rem;
        font-weight: 600;
        font-family: var(--font-mono);
        color: var(--color-accent-primary);
        background: var(--color-bg-card);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-full);
        box-shadow: var(--shadow-md);
        animation: float 6s ease-in-out infinite;
    }

    .tag-1 { top: 0; left: -70px; animation-delay: 0s; }
    .tag-2 { top: 45%; left: -80px; animation-delay: 1s; }
    .tag-3 { top: 25%; right: -60px; animation-delay: 0.5s; }
}

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

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-tertiary);
    font-size: 0.8125rem;
    animation: fadeInUp 0.6s ease 0.7s forwards;
    opacity: 0;
}

.scroll-arrow {
    animation: bounce 2s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-primary {
    color: var(--color-text-inverse);
    background: var(--color-accent-gradient);
    box-shadow: var(--shadow-md), 0 0 20px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(37, 99, 235, 0.4);
}

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

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

.btn-full {
    width: 100%;
}

/* ========================================
   Section Headers
======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   About Section
======================================== */
.about-content {
    display: grid;
    gap: var(--spacing-3xl);
}

@media (min-width: 1024px) {
    .about-content {
        grid-template-columns: 1.2fr 0.8fr;
        align-items: start;
    }
}

.about-lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

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

.highlight-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-fast);
}

.highlight-item:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-md);
}

.highlight-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-lg);
}

.highlight-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.highlight-content p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Metrics */
.about-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.metric-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-fast);
}

.metric-card:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-glow);
}

.metric-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
    margin-bottom: var(--spacing-sm);
}

.metric-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent-primary);
}

.metric-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

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

.skills-grid {
    display: grid;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1200px) {
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.skill-category {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-fast);
}

.skill-category:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-lg);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.category-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-lg);
}

.category-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    border: 1px solid;
    transition: all var(--transition-fast);
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-color: rgba(37, 99, 235, 0.3);
}

.skill-tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Experience Section
======================================== */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    display: flex;
    gap: var(--spacing-xl);
    padding-bottom: var(--spacing-2xl);
    padding-left: 50px;
}

.timeline-marker {
    position: absolute;
    left: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

.marker-dot {
    width: 16px;
    height: 16px;
    background: var(--color-accent-primary);
    border: 3px solid var(--color-bg-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--color-accent-light);
}

.timeline-content {
    flex: 1;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-fast);
}

.timeline-content:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-lg);
}

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

.timeline-date {
    display: flex;
    flex-direction: column;
}

.date-range {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent-primary);
}

.date-duration {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.timeline-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-full);
}

.timeline-badge.current {
    color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.timeline-location {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    margin-bottom: var(--spacing-lg);
}

.timeline-subsection {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.timeline-subsection:first-child {
    margin-top: 0;
}

.timeline-description ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.timeline-description li {
    position: relative;
    padding-left: var(--spacing-lg);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.timeline-description li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-accent-primary);
    border-radius: 50%;
}

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

.tech-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    font-family: var(--font-mono);
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-sm);
}

/* ========================================
   Education Section
======================================== */
.education {
    background: var(--color-bg-secondary);
}

.education-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.education-column,
.education-card,
.cert-card {
    opacity: 1 !important;
    transform: none !important;
}

.column-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-accent-primary);
}

.education-card {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-fast);
}

.education-card:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-md);
}

.education-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-lg);
}

.education-date {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    margin-bottom: var(--spacing-xs);
}

.education-degree {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.education-school {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.education-detail {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.education-achievement {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-warning);
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius-full);
    margin-top: var(--spacing-sm);
}

/* Certifications */
.cert-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.cert-card:hover {
    border-color: var(--color-accent-primary);
}

.cert-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    color: inherit;
}

.cert-card:has(.cert-link):hover {
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.cert-badge {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
}

.cert-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.cert-issuer {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

/* Languages */
.languages-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.languages-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.language-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.language-name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.language-level {
    font-size: 0.875rem;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
}

/* ========================================
   Contact Section
======================================== */
.contact-content {
    display: grid;
    gap: var(--spacing-2xl);
    max-width: 600px;
    margin: 0 auto;
}

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

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.contact-card:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-card);
}

.contact-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
    border-radius: var(--radius-lg);
}

.contact-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-tertiary);
    margin-bottom: 2px;
}

.contact-value {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

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

/* Contact CTA */
.contact-cta {
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.contact-cta p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xl);
    text-align: center;
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-lg);
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.footer-social a:hover,
.footer-social button:hover {
    color: var(--color-accent-primary);
    background: var(--color-accent-light);
}

.footer-social button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

/* Copy tooltip */
.copy-tooltip {
    position: absolute;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-inverse);
    background: var(--color-accent-primary);
    border-radius: var(--radius-md);
    white-space: nowrap;
    z-index: var(--z-tooltip);
    animation: fadeInUp 0.2s ease;
}

.copy-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--color-accent-primary);
}

.social-link.copied,
.copy-email.copied {
    color: var(--color-success) !important;
    background: rgba(16, 185, 129, 0.1) !important;
}

.footer-bottom {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

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

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

/* Stagger children */
.reveal-stagger > * {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.reveal-stagger.active > *:nth-child(1) { transition-delay: 0.1s; }
.reveal-stagger.active > *:nth-child(2) { transition-delay: 0.2s; }
.reveal-stagger.active > *:nth-child(3) { transition-delay: 0.3s; }
.reveal-stagger.active > *:nth-child(4) { transition-delay: 0.4s; }
.reveal-stagger.active > *:nth-child(5) { transition-delay: 0.5s; }
.reveal-stagger.active > *:nth-child(6) { transition-delay: 0.6s; }

.reveal-stagger.active > * {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Utility Classes
======================================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   Print Styles
======================================== */
@media print {
    .navbar,
    .hero-background,
    .scroll-indicator,
    .theme-toggle,
    .lang-toggle {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .section {
        padding: 20px 0;
    }
}