/* ============================================
   DESIGN SYSTEM - CSS Variables & Reset
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Colors - Vibrant Dark Theme */
    --color-bg-primary: hsl(240, 15%, 9%);
    --color-bg-secondary: hsl(240, 12%, 12%);
    --color-bg-tertiary: hsl(240, 10%, 16%);

    /* Gradient Accents */
    --gradient-primary: linear-gradient(135deg, hsl(280, 80%, 60%) 0%, hsl(240, 80%, 60%) 50%, hsl(200, 80%, 60%) 100%);
    --gradient-secondary: linear-gradient(135deg, hsl(320, 80%, 55%) 0%, hsl(280, 80%, 60%) 100%);
    --gradient-accent: linear-gradient(90deg, hsl(280, 90%, 65%), hsl(200, 90%, 65%));

    /* Text Colors */
    --color-text-primary: hsl(0, 0%, 95%);
    --color-text-secondary: hsl(0, 0%, 70%);
    --color-text-muted: hsl(0, 0%, 50%);

    /* Accent Colors */
    --color-accent-purple: hsl(280, 80%, 60%);
    --color-accent-blue: hsl(220, 80%, 60%);
    --color-accent-pink: hsl(320, 80%, 60%);
    --color-accent-cyan: hsl(190, 80%, 60%);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    --spacing-section: 5rem 0;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

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

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;

    /* Z-Index */
    --z-navbar: 1000;
    --z-modal: 2000;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Particle Canvas Background */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: var(--z-navbar);
    transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

.navbar.scrolled {
    background-color: rgba(20, 20, 30, 0.8);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.navbar-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    position: relative;
}

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

.navbar-links a:hover {
    color: var(--color-text-primary);
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 900px;
    text-align: center;
}

.hero-greeting {
    font-size: var(--font-size-lg);
    color: var(--color-accent-cyan);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-5xl));
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-title .gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    min-height: 2rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background-color: var(--color-accent-purple);
    margin-left: 4px;
    animation: blink 1s infinite;
    vertical-align: middle;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.6s forwards;
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(180, 100, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(180, 100, 255, 0.5);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--color-text-primary);
    border: 2px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent-purple);
    transform: translateY(-2px);
}

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

section {
    padding: var(--spacing-3xl) var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    margin: var(--spacing-md) auto 0;
    border-radius: var(--radius-full);
}

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

.about {
    padding: var(--spacing-section);
    max-width: 1200px;
    margin: 0 auto;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.8s ease;
}

.about-text.visible {
    opacity: 1;
    transform: translateX(0);
}

.about-text p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-image {
    position: relative;
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.8s ease;
}

.about-image.visible {
    opacity: 1;
    transform: translateX(0);
}

.profile-photo {
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--radius-lg);
    object-fit: cover;
    box-shadow: 0 20px 60px rgba(180, 100, 255, 0.3);
    border: 3px solid transparent;
    background: var(--gradient-primary);
    background-clip: padding-box;
    transition: all var(--transition-base);
}

.profile-photo:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 70px rgba(180, 100, 255, 0.5);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

.projects {
    max-width: 1200px;
    margin: 0 auto;
}

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

.project-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
    cursor: pointer;
    opacity: 0;
    transform: translateY(30px);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(180, 100, 255, 0.2);
    border-color: var(--color-accent-purple);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.project-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.project-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(180, 100, 255, 0.15);
    color: var(--color-accent-purple);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

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

.skills {
    max-width: 1000px;
    margin: 0 auto;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.skill-item {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.skill-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.skill-name {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.skill-percentage {
    color: var(--color-accent-purple);
    font-weight: 600;
}

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

.skill-progress {
    height: 100%;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    width: 0;
    transition: width 1.5s ease;
    position: relative;
    overflow: hidden;
}

.skill-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

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

.contact {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease;
}

.contact-text.visible {
    opacity: 1;
    transform: translateY(0);
}

.contact-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease 0.2s;
}

.contact-links.visible {
    opacity: 1;
    transform: translateY(0);
}

.contact-link {
    width: 60px;
    height: 60px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-xl);
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.contact-link:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 30px rgba(180, 100, 255, 0.4);
}

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

footer {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--color-text-muted);
    border-top: 1px solid var(--glass-border);
    position: relative;
    z-index: 1;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

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

    100% {
        transform: translateX(100%);
    }
}

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

@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .navbar {
        padding: var(--spacing-md);
    }

    .navbar-links {
        gap: var(--spacing-md);
    }

    .navbar-links a {
        font-size: var(--font-size-xs);
    }

    .hero {
        padding: var(--spacing-md);
    }

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

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

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

    section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
}

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

    .btn {
        width: 100%;
    }
}