/* ============================================================================
   MODERN PORTFOLIO - PROFESSIONAL DESIGN SYSTEM
   
   Visual Direction:
   - Dark background (#0f0f0f) with yellow accent color (#FBBF24)
   - Strong typography hierarchy with premium feel
   - Mobile-first, fully responsive
   - Subtle, professional animations
   - Clean, minimal aesthetic
   
   ============================================================================ */

/* ============================================================================
   1. CSS VARIABLES - DESIGN SYSTEM
   ============================================================================ */

:root {
    /* Colors */
    --color-bg: #0f0f0f;
    --color-bg-secondary: #1a1a1a;
    --color-bg-tertiary: #252525;
    --color-text: #ffffff;
    --color-text-secondary: #d1d5db;
    --color-text-tertiary: #b3b8c2;
    --color-accent: #fbbf24;
    --color-accent-dark: #f59e0b;
    --color-accent-light: rgba(251, 191, 36, 0.1);
    
    /* Typography */
    --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    --font-family-serif: 'Georgia', 'Times New Roman', serif;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3.5rem;
    
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --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;
    --space-24: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-base: 300ms ease-out;
    --transition-slow: 500ms ease-out;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.5);
}

/* ============================================================================
   2. RESET & FOUNDATIONAL STYLES
   ============================================================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    letter-spacing: 0.3px;
    overflow-x: hidden;
}

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

/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    letter-spacing: -0.5px;
}

h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-4);
}

h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-6);
}

h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
}

p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    line-height: 1.8;
}

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

a:hover {
    color: var(--color-accent-dark);
}
a:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 4px;
}

a:focus-visible,
button:focus-visible,
.social-icon:focus-visible {
    border-color: var(--color-accent);
}


/* ============================================================================
   4. CONTAINER & LAYOUT
   ============================================================================ */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* ============================================================================
   5. BUTTONS & CTA
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-8);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    min-height: 44px;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #000;
    box-shadow: 0 4px 12px rgba(251, 191, 36, 0.2);
}

.btn-primary:hover {
    background-color: var(--color-accent-dark);
    box-shadow: 0 6px 20px rgba(251, 191, 36, 0.3);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent-dark);
    transform: translateY(-2px);
}

/* ============================================================================
   6. SECTION HEADER
   ============================================================================ */

.section-header {
    text-align: center;
    margin-bottom: var(--space-20);
}

.section-label {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.section-header h2 {
    color: var(--color-text);
    margin-bottom: var(--space-8);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================================================
   7. HERO SECTION
   ============================================================================ */

.hero {
    padding: var(--space-20) var(--space-4) var(--space-24);
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
    align-items: center;
}

.hero-text {
    flex: 1;
    animation: slideUp 0.8s ease-out;
}

.hero-text h1 {
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

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

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 500px;
    line-height: 1.8;
    margin-bottom: var(--space-12);
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    width: 100%;
    max-width: 300px;
}

.hero-image {
    width: 100%;
    max-width: 400px;
    border-radius: 32px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: fadeIn 1s ease-out 0.3s backwards;
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ============================================================================
   HOW I THINK SECTION
   ============================================================================ */

.how-i-think {
    padding: var(--space-24) var(--space-4);
    background-color: var(--color-bg-secondary);
}

.how-i-think .container {
    max-width: 900px;
    margin: 0 auto;
}

/* Local header (do NOT override global section-header styles) */
.how-i-think .section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.how-i-think .section-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 1.2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

.how-i-think h1 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    line-height: 1.3;
    color: var(--color-text);
    text-align: center;
}

/* Thinking content */
.thinking-process {
    max-width: 720px;
}

.thinking-step {
    position: relative;
    padding-left: var(--space-6);
    border-left: 2px solid var(--color-bg-tertiary);
}

.thinking-step::before {
    content: "";
    position: absolute;
    left: -2px;
    top: 0.5rem;
    width: 2px;
    height: 24px;
    background-color: var(--color-accent);
}

.thinking-step h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.thinking-step p {
    font-size: var(--font-size-sm);
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin: 0;
}

/* ============================================================================
   RESPONSIVE TWEAKS
   ============================================================================ */

@media (max-width: 768px) {
    .how-i-think {
        padding: var(--space-16) var(--space-4);
    }

    .how-i-think h1 {
        font-size: var(--font-size-xl);
    }
}


/* ============================================================================
   8. PROJECTS SECTION
   ============================================================================ */

.projects {
    padding: var(--space-24) var(--space-4);
    background-color: var(--color-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-12);
}

.project-card {
    background-color: var(--color-bg-secondary);
    border-radius: 32px;
    overflow: hidden;
    transition: all var(--transition-base);
    border: 1px solid var(--color-bg-tertiary);
    animation: fadeIn 0.8s ease-out;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.project-image-wrapper {
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background-color: var(--color-bg-tertiary);
}

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

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-content {
    padding: var(--space-8);
}

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

.project-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-6);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.tech-tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    padding: var(--space-2) var(--space-4);
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-medium);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
}

.project-link:hover {
    color: var(--color-accent-dark);
}

/* ============================================================================
   9. SKILLS SECTION
   ============================================================================ */

.skills {
    padding: var(--space-24) var(--space-4);
    background-color: var(--color-bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-12);
}

.skill-category {
    background-color: var(--color-bg);
    padding: var(--space-12);
    border-radius: 32px;
    border: 1px solid var(--color-bg-tertiary);
    transition: all var(--transition-base);
}

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

.skill-category h3 {
    color: var(--color-accent);
    margin-bottom: var(--space-8);
    font-size: var(--font-size-lg);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    color: var(--color-text-secondary);
    padding: var(--space-3) 0;
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
}

.skill-list li:before {
    content: "→";
    color: var(--color-accent);
    font-weight: bold;
    margin-right: var(--space-3);
    opacity: 0.6;
}

/* ============================================================================
   10. ABOUT SECTION
   ============================================================================ */

.about {
    padding: var(--space-24) var(--space-4);
    background-color: var(--color-bg);
    text-align: center;
}
.avatar-line {
    position: relative;
    margin-bottom: 1.5rem;
}
.line {
    display: block;
    height: 2px;
    width: 100%;
    background: linear-gradient(
        90deg, 
        #3b82f6,
        #f97316,
        #facc15
    );
    opacity: 0.8;
}

.avatar {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 3px solid #111;
    box-shadow: 
    0 0 20px rgba(249, 115, 22, 0.6)
    0 0 40px rgba(59, 130, 246, 0.4) ;
}
.name {
    opacity: 0.6;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

h1{
    font-size: clamp(1.8rem, 5vw, 2.4rem);
    font-weight: 600;
    margin-bottom: 0.75rem;
}
.status{
     font-size: 0.95rem;
     opacity: 0.85;
     display: inline-flex;
     align-items: center;
     gap: 0.4rem;
     margin-bottom: 2rem; 
}
.dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
}
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    font-size: var(--font-size-base);
    line-height: 1.9;
    margin-bottom: var(--space-8);
    color: var(--color-text-secondary);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-16);
}

.stat-item {
    background-color: var(--color-bg-secondary);
    padding: var(--space-8);
    border-radius: 32px;
    border: 1px solid var(--color-bg-tertiary);
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============================================================================
   11. OPEN SOURCE SECTION
   ============================================================================ */

      /* Contributions Section */
        #contributions {
            max-width: 1200px;
            margin: 6rem auto;
            padding: 0 2rem;
        }

        #contributions h2 {
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 700;
            margin-bottom: 1rem;
            color: #fff;
            letter-spacing: -0.02em;
        }

        .section-intro {
            color: #a1a1a1;
            font-size: 1.125rem;
            margin-bottom: 3rem;
            max-width: 600px;
        }

        /* Contribution Card */
        .contribution-card {
            background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 16px;
            padding: 2.5rem;
            margin-bottom: 2rem;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .contribution-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #6366f1, #8b5cf6);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .contribution-card:hover {
            border-color: rgba(255,255,255,0.2);
            transform: translateY(-4px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
        }

        .contribution-card:hover::before {
            opacity: 1;
        }

        .contribution-card h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.5rem;
            letter-spacing: -0.01em;
        }

        .date {
            color: #8b5cf6;
            font-size: 0.875rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 1rem;
            display: inline-block;
        }

        .contribution-card > p {
            color: #d4d4d4;
            font-size: 1.125rem;
            margin-bottom: 1.5rem;
            line-height: 1.7;
        }

        .contribution-card ul {
            list-style: none;
            margin-bottom: 2rem;
        }

        .contribution-card ul li {
            color: #a1a1a1;
            padding-left: 1.5rem;
            margin-bottom: 0.75rem;
            position: relative;
            font-size: 1rem;
            line-height: 1.6;
        }

        .contribution-card ul li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: #6366f1;
            font-weight: bold;
        }

        .pr-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: #fff;
            text-decoration: none;
            font-weight: 500;
            padding: 0.75rem 1.5rem;
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            border-radius: 8px;
            transition: all 0.3s ease;
            font-size: 0.95rem;
        }

        .pr-link:hover {
            transform: translateX(4px);
            box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
        }

        .pr-link::after {
            content: '→';
            font-size: 1.2rem;
            transition: transform 0.3s ease;
        }

        .pr-link:hover::after {
            transform: translateX(4px);
        }

        /* Tech Stack Tags */
        .tech-stack {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 1.5rem;
        }

        .tech-tag {
            background: rgba(99, 102, 241, 0.1);
            border: 1px solid rgba(99, 102, 241, 0.3);
            color: #a5b4fc;
            padding: 0.4rem 0.9rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
        }

        /* Responsive */
        @media (max-width: 768px) {
            #contributions {
                padding: 0 1rem;
                margin: 4rem auto;
            }

            .contribution-card {
                padding: 1.5rem;
            }

            .contribution-card h3 {
                font-size: 1.25rem;
            }
        }

/* ============================================================================
   11. CONTACT SECTION
   ============================================================================ */

.contact {
    padding: var(--space-24) var(--space-4);
    background-color: var(--color-bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    max-width: 1000px;
    margin: 0 auto;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-12);
}

.contact-item h3 {
    color: var(--color-accent);
    margin-bottom: var(--space-3);
    font-size: var(--font-size-lg);
}

.contact-item p {
    color: var(--color-text-secondary);
    margin: 0;
}

.contact-item a {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.contact-item a:hover {
    color: var(--color-accent-dark);
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    justify-content: center;
}

.social-heading {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0;
}

.social-icons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: 2px solid var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    color: var(--color-text);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.social-icon:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: var(--color-accent-light);
    transform: translateY(-4px);
}

.social-icon svg {
    width: 24px;
    height: 24px;
}

/* ============================================================================
   12. FOOTER
   ============================================================================ */

.footer {
    padding: var(--space-12) var(--space-4);
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-bg-tertiary);
    text-align: center;
}

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

.footer p:not(:last-child) {
    margin-bottom: var(--space-2);
}

/* ============================================================================
   13. RESPONSIVE DESIGN - MOBILE FIRST
   ============================================================================ */

@media (max-width: 768px) {
    /* Typography adjustments */
    h1 {
        font-size: var(--font-size-2xl);
    }
    
    h2 {
        font-size: var(--font-size-2xl);
        margin-bottom: var(--space-4);
    }
    
    h3 {
        font-size: var(--font-size-lg);
    }
    
    /* Hero */
    .hero {
        padding: var(--space-12) var(--space-4) var(--space-16);
    }
    
    .hero-cta {
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    /* Section headers */
    .section-header {
        margin-bottom: var(--space-12);
    }
    
    .section-header h2 {
        margin-bottom: var(--space-4);
    }
    
    /* Sections */
    .projects,
    .skills,
    .about,
    .contact {
        padding: var(--space-16) var(--space-4);
    }
    
    /* Contact layout */
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    /* Projects/Skills grid */
    .projects-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    /* Stats */
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    /* Adjust spacing on very small screens */
    :root {
        --space-4: 0.75rem;
        --space-6: 1rem;
        --space-8: 1.5rem;
        --space-12: 2rem;
        --space-16: 2.5rem;
        --space-20: 3rem;
        --space-24: 4rem;
    }
    
    h1 {
        font-size: var(--font-size-xl);
    }
    
    h2 {
        font-size: var(--font-size-xl);
    }
    
    .subtitle {
        font-size: var(--font-size-lg);
    }
    
    .tagline {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-8);
    }
    
    .container {
        padding: 0 var(--space-3);
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .social-icons {
        gap: var(--space-3);
    }
    
    .social-icon {
        width: 44px;
        height: 44px;
    }
}

@media (min-width: 1024px) {
    /* Desktop enhancements */
    .hero-content {
        flex-direction: row;
        gap: var(--space-20);
        align-items: center;
    }
    
    .hero-cta {
        flex-direction: row;
        width: auto;
    }
    
    .hero-image {
        max-width: 500px;
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================================================
   14. ANIMATIONS & TRANSITIONS
   ============================================================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* Utility for smooth scrolling */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
        transform: none !important;
    }

    html {
        scroll-behavior: auto;
    }
}