/* CSS Custom Properties for Design System */
:root {
    /* Colors - Light Theme */
    --bg-primary: #ffffff;
    --bg-primary-rgb: 255, 255, 255;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent-primary: #8b5cf6;
    --accent-secondary: #8b5cf6;
    
    /* Pink accents */
    --accent-pink: #f9a8d4; /* lighter pink (for light background) */
    --accent-pink-2: #f472b6; /* rose-400 */
    --accent-pink-rgb: 249, 168, 212;
    --accent-pink-2-rgb: 244, 114, 182;
    --accent-success: #10b981;
    --border-light: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --shadow-strong: rgba(0, 0, 0, 0.25);
    
    /* Typography */
    --font-family-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Layout */
    --container-max-width: 1200px;
    --navbar-height: 70px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-primary-rgb: 15, 23, 42;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent-primary: #a78bfa;
    --accent-secondary: #a78bfa;
    /* Dark theme pink accents */
    --accent-pink: #ec4899; /* stronger pink for dark background */
    --accent-pink-2: #f472b6;
    --accent-pink-rgb: 236, 72, 153;
    --accent-pink-2-rgb: 244, 114, 182;
    --border-light: #334155;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --shadow-strong: rgba(0, 0, 0, 0.6);
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

/* Accessibility */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-pink-2);
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: 6px;
}

/* Focus styles for better accessibility */
button:focus-visible,
a:focus-visible,
input:focus-visible,
.social-link:focus-visible,
.cta-primary:focus-visible,
.cta-secondary:focus-visible {
    outline: 2px solid var(--accent-pink);
    outline-offset: 2px;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Layout Components */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: all var(--transition-base);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--accent-pink-2);
}

.nav-brand::after {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-left: 8px;
    vertical-align: middle;
    background: #10b981;
    border-radius: 50%;
}

.nav-links {
    display: flex;
    gap: var(--space-8);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-base);
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-container {
        padding: 0 var(--space-4);
    }
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

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

/* Language Switch */
.lang-switch {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-1);
}

.lang-btn {
    background: transparent;
    border: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.lang-btn.active {
    background: var(--accent-pink);
    color: white;
}

.lang-btn:hover:not(.active) {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* Hero Section */
.hero {
    padding: calc(var(--navbar-height) + var(--space-20)) 0 var(--space-20);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, var(--accent-pink)10, transparent 50%),
                radial-gradient(circle at 70% 80%, var(--accent-pink-2)10, transparent 50%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-12);
    align-items: center;
    animation: slideInUp 0.8s ease-out;
}

@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-8);
    }
}

.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.profile-img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid var(--accent-primary);
    box-shadow: 0 0 0 0 var(--accent-primary);
    animation: pulse 2s infinite;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.profile-img:hover {
    transform: scale(1.05);
}

.profile-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-success);
    animation: blink 2s infinite;
}

.hero-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    margin: 0;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-secondary), var(--accent-pink-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    margin: 0;
}

.hero-location {
    color: var(--text-muted);
    font-size: var(--font-size-base);
    margin: 0;
}

.hero-description {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    line-height: 1.6;
    margin: var(--space-4) 0 0 0;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }
}

/* Buttons */
.cta-primary, .cta-secondary {
    display: inline-flex;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    font-size: var(--font-size-base);
}

.cta-primary {
    background: var(--accent-pink-2);
    color: white;
    box-shadow: 0 4px 12px var(--shadow-light);
}

.cta-primary:hover {
    background: var(--accent-pink);
    transform: translateY(-2px);
}

.cta-secondary {
    background: transparent;
    color: var(--accent-pink-2);
    border: 2px solid var(--accent-pink);
}

.cta-secondary:hover {
    background: var(--accent-pink);
    color: white;
    transform: translateY(-2px);
}

/* Section Styles */
.skills-section, .projects-section, .contact-section, .experience-section, .education-section {
    padding: var(--space-20) 0;
}

.experience-section, .education-section {
    background: var(--bg-secondary);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--space-16);
    color: var(--text-primary);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.skill-category {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-4px);
}

.skill-category h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-6);
    color: var(--accent-primary);
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast);
}

.skill-item:hover {
    transform: translateX(4px);
}

.skill-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.skill-level {
    margin-left: auto;
    width: 60px;
    height: 4px;
    background: var(--border-light);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
}

.skill-level::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-pink), var(--accent-pink-2));
    border-radius: var(--radius-sm);
    width: var(--level, 0%);
    transition: width 1s ease-out;
}

.skill-icon-text {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    background: var(--accent-pink);
    color: white;
    border-radius: var(--radius-sm);
}

.soft-skills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.skill-tag {
    background: var(--accent-pink);
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
}

/* Experience & Education Timeline */
.experience-timeline, .education-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.experience-timeline::before, .education-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-pink);
}

.experience-item, .education-item {
    position: relative;
    margin-bottom: var(--space-12);
    padding-left: var(--space-16);
}

.experience-item::before, .education-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 8px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-pink-2);
    border: 3px solid var(--bg-primary);
}

.experience-item.current::before, .education-item.current::before {
    background: var(--accent-success);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
}

.experience-date, .education-date {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
}

.experience-content, .education-content {
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    box-shadow: 0 4px 12px var(--shadow-light);
}

.experience-company h3, .education-content h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--space-2) 0;
    color: var(--text-primary);
}

.experience-role {
    color: var(--accent-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-base);
}

.education-school {
    color: var(--accent-secondary);
    font-style: italic;
    margin: var(--space-1) 0 var(--space-3) 0;
}

.experience-details, .education-details {
    list-style: none;
    padding: 0;
    margin: var(--space-4) 0 0 0;
}

.experience-details li, .education-details li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
    line-height: 1.6;
}

.experience-details li::before, .education-details li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

@media (max-width: 768px) {
    .experience-timeline::before, .education-timeline::before {
        left: 15px;
    }
    
    .experience-item, .education-item {
        padding-left: var(--space-12);
    }
    
    .experience-item::before, .education-item::before {
        left: -9px;
    }
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.project-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
    position: relative;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-medium);
}

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

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    color: white;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: linear-gradient(90deg, var(--accent-pink), var(--accent-primary));
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-link:hover {
    background: linear-gradient(90deg, var(--accent-pink-2), var(--accent-secondary));
    transform: scale(1.1);
}

.project-content {
    padding: var(--space-6);
}

.project-content h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Tags */
.tag {
    display: inline-block;
    background: transparent;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    border: 1px solid var(--accent-pink);
}

.tag:hover {
    /* fallback for browsers without color-mix */
    background: rgba(var(--accent-pink-rgb), 0.18);
    transform: translateY(-2px) scale(1.02);
    color: white;
    border-color: var(--accent-pink-2);
}

/* Dark theme adjustment: ensure tags are readable on dark bg */
[data-theme="dark"] .tag {
    color: var(--text-primary);
    border: 1px solid rgba(var(--accent-pink-rgb), 0.6);
}

[data-theme="dark"] .tag:hover {
    background: rgba(var(--accent-pink-rgb), 0.28);
}

/* Profile image soft pink glow */
.profile-img {
    box-shadow: 0 8px 30px rgba(var(--accent-pink-rgb), 0.12), 0 2px 8px rgba(0,0,0,0.08);
}

/* Nav link underline uses pink on hover */
.nav-links a::after {
    background: var(--accent-primary);
}
.nav-links a:hover {
    color: var(--accent-pink);
}
.nav-links a:hover::after {
    background: var(--accent-pink);
    width: 100%;
}

/* Contact Section */
.contact-section {
    background: var(--bg-secondary);
}

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

.contact-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
}

@media (max-width: 480px) {
    .social-links {
        flex-direction: column;
        align-items: center;
    }
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    background: var(--bg-primary);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-base);
    font-weight: var(--font-weight-medium);
}

.social-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.social-link.github:hover {
    border-color: #333;
    background: #333;
    color: white;
}

.social-link.email:hover {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    color: white;
}

/* Footer */
.footer {
    padding: var(--space-8) 0;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.footer p {
    margin: 0;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

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

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 var(--accent-primary);
    }
    70% {
        box-shadow: 0 0 0 10px transparent;
    }
    100% {
        box-shadow: 0 0 0 0 transparent;
    }
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0.3;
    }
}

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

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --space-20: 3rem;
        --space-16: 2.5rem;
        --space-12: 2rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: calc(var(--navbar-height) + var(--space-12)) 0 var(--space-12);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
}