/* ============================================
   DESIGN SYSTEM - COHESIVE & INTEGRATED
   ============================================ */

:root {
    /* Primary Colors */
    --ps-blue: #0078d4;
    --ps-light: #50e6ff;
    --py-yellow: #ffd43b;
    --py-blue: #366994;
    
    /* Base Colors */
    --bg-dark: #0d1117;
    --bg-darker: #010409;
    --bg-surface: #161b22;
    --bg-surface-light: #21262d;
    
    /* Text Colors */
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    
    /* Accents */
    --accent-1: #58a6ff;
    --accent-2: #79c0ff;
    --accent-3: #1f6feb;
    
    /* Shadows */
    --shadow-sm: 0 3px 12px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   NAVIGATION BAR
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(88, 166, 255, 0.1);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    position: relative;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--ps-blue), var(--py-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-icon {
    font-size: 1.8rem;
    color: var(--ps-light);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast);
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--ps-blue), var(--py-yellow));
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--accent-1);
}

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

.nav-accent {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--ps-blue), var(--py-yellow), transparent);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    position: relative;
    padding: 120px 2rem 80px;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-surface) 100%);
    border-bottom: 1px solid rgba(88, 166, 255, 0.1);
    overflow: hidden;
    margin-top: 70px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.1;
}

.code-line {
    position: absolute;
    background: var(--ps-light);
    opacity: 0.3;
}

.line-1 {
    width: 80%;
    height: 1px;
    top: 20%;
    left: 10%;
    animation: slideIn 2s ease-out 0.1s forwards;
}

.line-2 {
    width: 60%;
    height: 1px;
    top: 40%;
    right: 10%;
    animation: slideIn 2s ease-out 0.2s forwards;
}

.line-3 {
    width: 70%;
    height: 1px;
    top: 60%;
    left: 15%;
    animation: slideIn 2s ease-out 0.3s forwards;
}

.line-4 {
    width: 65%;
    height: 1px;
    top: 80%;
    right: 15%;
    animation: slideIn 2s ease-out 0.4s forwards;
}

@keyframes slideIn {
    from {
        width: 0;
        opacity: 0;
    }
    to {
        opacity: 0.3;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.title-ps {
    background: linear-gradient(135deg, var(--ps-blue), var(--ps-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sep {
    color: var(--text-secondary);
    margin: 0 1rem;
}

.title-py {
    background: linear-gradient(135deg, var(--py-blue), var(--py-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.8rem;
    color: var(--accent-1);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    margin: 2.5rem 0;
    padding: 1.5rem;
    background: rgba(88, 166, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(88, 166, 255, 0.1);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--ps-blue), var(--py-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 0.5rem;
}

.stat-separator {
    width: 1px;
    height: 60px;
    background: rgba(88, 166, 255, 0.2);
}

.hero-cta {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--ps-blue), var(--accent-1));
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all var(--transition-base);
    box-shadow: 0 8px 24px rgba(0, 120, 212, 0.3);
    border: 1px solid rgba(88, 166, 255, 0.3);
}

.hero-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 120, 212, 0.4);
    border-color: rgba(88, 166, 255, 0.6);
}

/* ============================================
   SECTIONS
   ============================================ */

.section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    border-bottom: 1px solid rgba(88, 166, 255, 0.05);
}

.section-header {
    margin-bottom: 3rem;
    text-align: center;
}

.section-header h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-1), var(--py-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-underline {
    width: 80px;
    height: 3px;
    margin: 1rem auto 0;
    background: linear-gradient(90deg, var(--ps-blue), var(--py-yellow));
    border-radius: 2px;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.tech-stack {
    background: rgba(88, 166, 255, 0.05);
    border: 1px solid rgba(88, 166, 255, 0.1);
    padding: 2rem;
    border-radius: 12px;
    transition: all var(--transition-base);
}

.tech-stack:hover {
    border-color: rgba(88, 166, 255, 0.3);
    box-shadow: 0 8px 24px rgba(88, 166, 255, 0.1);
}

.tech-stack h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--accent-1);
}

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid;
    transition: all var(--transition-fast);
}

.badge-ps {
    background: rgba(0, 120, 212, 0.1);
    border-color: var(--ps-blue);
    color: var(--ps-light);
}

.badge-ps:hover {
    background: rgba(0, 120, 212, 0.2);
    box-shadow: 0 0 20px rgba(0, 120, 212, 0.3);
}

.badge-py {
    background: rgba(55, 105, 148, 0.1);
    border-color: var(--py-blue);
    color: var(--py-yellow);
}

.badge-py:hover {
    background: rgba(55, 105, 148, 0.2);
    box-shadow: 0 0 20px rgba(55, 105, 148, 0.3);
}

.badge-other {
    background: rgba(88, 166, 255, 0.1);
    border-color: var(--accent-1);
    color: var(--accent-2);
}

.badge-other:hover {
    background: rgba(88, 166, 255, 0.2);
    box-shadow: 0 0 20px rgba(88, 166, 255, 0.3);
}

/* ============================================
   SKILLS SECTION
   ============================================ */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: rgba(88, 166, 255, 0.03);
    border: 1px solid rgba(88, 166, 255, 0.1);
    padding: 2rem;
    border-radius: 12px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(88, 166, 255, 0.1), transparent);
    border-radius: 50%;
    transition: all var(--transition-slow);
}

.skill-category:hover {
    border-color: rgba(88, 166, 255, 0.3);
    background: rgba(88, 166, 255, 0.08);
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.skill-category:hover::before {
    top: -20%;
    right: -20%;
}

.skill-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 10px;
    font-weight: 800;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: white;
}

.ps-icon {
    background: linear-gradient(135deg, var(--ps-blue), var(--ps-light));
}

.py-icon {
    background: linear-gradient(135deg, var(--py-blue), var(--py-yellow));
}

.other-icon {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-3));
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.skill-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.skill-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-1);
    font-weight: bold;
}

.skill-progress {
    height: 6px;
    background: rgba(88, 166, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--ps-blue), var(--py-yellow));
    border-radius: 3px;
    transition: width 1s ease-out;
}

/* ============================================
   WORK SECTION
   ============================================ */

.work-subsection {
    margin-bottom: 3rem;
}

.subsection-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--accent-2);
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.work-card {
    background: rgba(88, 166, 255, 0.04);
    border: 1px solid rgba(88, 166, 255, 0.1);
    border-radius: 12px;
    padding: 1.8rem;
    transition: all var(--transition-base);
    position: relative;
    display: flex;
    flex-direction: column;
}

.work-card:hover {
    border-color: rgba(88, 166, 255, 0.3);
    background: rgba(88, 166, 255, 0.08);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
}

.card-badge {
    display: inline-block;
    width: fit-content;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.ps-badge {
    background: rgba(0, 120, 212, 0.15);
    color: var(--ps-light);
}

.py-badge {
    background: rgba(55, 105, 148, 0.15);
    color: var(--py-yellow);
}

.work-card h4 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.card-description {
    flex-grow: 1;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.2rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.2rem;
}

.tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: rgba(88, 166, 255, 0.1);
    color: var(--accent-2);
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid rgba(88, 166, 255, 0.2);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: rgba(88, 166, 255, 0.2);
    border-color: rgba(88, 166, 255, 0.4);
}

.card-link {
    color: var(--accent-1);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.card-link:hover {
    color: var(--accent-2);
    gap: 0.8rem;
}

/* ============================================
   COMPOSITION SECTION
   ============================================ */

.composition-container {
    max-width: 800px;
    margin: 0 auto;
}

.chart-bar {
    display: flex;
    height: 60px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.chart-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
    transition: all var(--transition-base);
    position: relative;
}

.chart-segment:hover {
    filter: brightness(1.2);
}

.ps-segment {
    background: linear-gradient(135deg, var(--ps-blue), var(--ps-light));
}

.py-segment {
    background: linear-gradient(135deg, var(--py-blue), var(--py-yellow));
}

.segment-label {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.composition-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
}

/* ============================================
   CONTACT SECTION
   ============================================ */

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

.contact-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-base);
    border: 2px solid;
}

.contact-link.primary {
    background: linear-gradient(135deg, var(--ps-blue), var(--accent-1));
    border-color: rgba(88, 166, 255, 0.5);
    color: white;
    box-shadow: 0 8px 24px rgba(0, 120, 212, 0.3);
}

.contact-link.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 120, 212, 0.4);
    border-color: rgba(88, 166, 255, 0.8);
}

.contact-link.secondary {
    background: transparent;
    border-color: rgba(88, 166, 255, 0.3);
    color: var(--accent-1);
}

.contact-link.secondary:hover {
    background: rgba(88, 166, 255, 0.1);
    border-color: rgba(88, 166, 255, 0.6);
}

.link-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-base);
}

.contact-link:hover .link-icon {
    transform: translateX(3px);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background: var(--bg-darker);
    border-top: 1px solid rgba(88, 166, 255, 0.1);
    padding: 2rem;
    text-align: center;
}

.footer-content p {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

.footer-credit {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.9rem;
    }

    .hero {
        padding: 100px 1rem 60px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .title-sep {
        margin: 0 0.5rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .stat-separator {
        width: 60px;
        height: 1px;
    }

    .section {
        padding: 3rem 1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .work-grid {
        grid-template-columns: 1fr;
    }

    .contact-links {
        flex-direction: column;
    }

    .contact-link {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0 1rem;
    }

    .nav-links {
        gap: 0.8rem;
    }

    .nav-link {
        font-size: 0.8rem;
    }

    .brand-text {
        display: none;
    }

    .hero {
        padding: 80px 1rem 40px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .work-grid {
        grid-template-columns: 1fr;
    }
}