/* CSS Variables for Theme System */
 :root {
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Light theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow-light: rgba(15, 23, 42, 0.04);
    --shadow-medium: rgba(15, 23, 42, 0.08);
    --shadow-heavy: rgba(15, 23, 42, 0.16);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --code-bg: #f1f5f9;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-medium: rgba(0, 0, 0, 0.3);
    --shadow-heavy: rgba(0, 0, 0, 0.4);
    --glass-bg: rgba(15, 23, 42, 0.8);
    --code-bg: #1e293b;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --border-color: #334155;
        --shadow-light: rgba(0, 0, 0, 0.2);
        --shadow-medium: rgba(0, 0, 0, 0.3);
        --shadow-heavy: rgba(0, 0, 0, 0.4);
        --glass-bg: rgba(15, 23, 42, 0.8);
        --code-bg: #1e293b;
    }
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 0.5rem;
    display: flex;
    gap: 0.25rem;
    box-shadow: 0 4px 20px var(--shadow-light);
}

.theme-btn {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.nav-dot::before {
    content: attr(data-section);
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--glass-bg);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.3s ease;
    white-space: nowrap;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.nav-dot:hover::before {
    opacity: 1;
}

.nav-dot.active {
    background: var(--primary-color);
    transform: scale(1.2);
}

/* Sections */
.section {
    min-height: 100vh;
    padding: 2rem;
    display: flex;
    align-items: center;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Hero Section */
.hero {
    background: radial-gradient(ellipse at center, var(--bg-secondary) 0%, var(--bg-primary) 70%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 500;
}

.typing-text {
    display: inline-block;
    border-right: 2px solid var(--primary-color);
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { border-color: var(--primary-color); }
    51%, 100% { border-color: transparent; }
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.hero-avatar {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero-avatar::before {
    content: '';
    position: absolute;
    inset: -20px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--primary-color));
    border-radius: 50%;
    z-index: -1;
    animation: rotate 20s linear infinite;
    opacity: 0.3;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.avatar-image {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    color: var(--primary-color);
    overflow: hidden;
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    transition: transform 0.3s ease;
}

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

/* Tech Stack */
.tech-stack {
    margin-top: 3rem;
}

.tech-stack-title {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tech-icons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.tech-icon {
    width: 3rem;
    height: 3rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border-color);
}

.tech-icon:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-medium);
}

/* Work Section */
.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: var(--bg-secondary);
    border-radius: 1.5rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

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

.service-icon {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1.5rem;
}

.service-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

.skill-category {
    background: var(--bg-secondary);
    border-radius: 1.5rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.skill-category h3 {
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.skill-item {
    margin-bottom: 1.5rem;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.skill-name {
    font-weight: 500;
    color: var(--text-primary);
}

.skill-percentage {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.skill-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 2s ease-in-out;
    position: relative;
}

.skill-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Portfolio Section */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.portfolio-card {
    background: var(--bg-secondary);
    border-radius: 1.5rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
}

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

.portfolio-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    position: relative;
    overflow: hidden;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.portfolio-content {
    padding: 2rem;
}

.portfolio-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.portfolio-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.portfolio-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.portfolio-links {
    display: flex;
    gap: 1rem;
}

.link-btn {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.link-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.link-btn.secondary {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.contact-details h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.contact-form {
    background: var(--bg-secondary);
    border-radius: 1.5rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .theme-toggle {
        top: 1rem;
        right: 1rem;
    }
    
    .nav {
        display: none;
    }
    
    .section {
        padding: 1rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-avatar {
        order: -1;
        width: 200px;
        height: 200px;
        margin: 0 auto;
    }
    
    .skills-grid,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .portfolio-grid,
    .work-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        justify-content: center;
    }
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.social-link {
    width: 3rem;
    height: 3rem;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.copyright {
    color: var(--text-muted);
    font-size: 0.875rem;
}