/* ============================================
   PixelForge Pro - Premium Portfolio Template
   Design System: Premium Dark Modern
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Premium Dark Theme */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a25;
    --color-bg-card: #151520;
    
    /* Accent - Electric Cyan */
    --color-accent: #00d4ff;
    --color-accent-hover: #33ddff;
    --color-accent-glow: rgba(0, 212, 255, 0.3);
    
    /* Text Colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0b0;
    --color-text-muted: #6a6a7a;
    
    /* Gradients */
    --gradient-hero: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Spacing - 8px scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--color-accent-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-index */
    --z-nav: 100;
    --z-modal: 200;
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    padding: 0 var(--space-6);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-weight: 700;
    font-size: var(--text-xl);
}

.logo-text {
    color: var(--color-text-primary);
}

.logo-pro {
    color: var(--color-accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    padding: var(--space-2) 0;
    transition: var(--transition-fast);
}

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

.nav-link:hover {
    color: var(--color-text-primary);
}

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

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.nav-toggle-bar {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-base);
}

.nav-toggle.active .nav-toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .nav-toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    position: relative;
    padding-top: 72px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--space-16) var(--space-6);
}

.hero-content {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-avatar-wrapper {
    width: 160px;
    height: 160px;
    margin: 0 auto var(--space-8);
    position: relative;
}

.hero-avatar-wrapper::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: var(--radius-full);
    background: var(--gradient-accent);
    opacity: 0.5;
    filter: blur(10px);
}

.hero-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-full);
    border: 3px solid var(--color-accent);
    position: relative;
    z-index: 1;
}

.hero-name {
    font-size: var(--text-5xl);
    font-weight: 800;
    margin-bottom: var(--space-3);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: var(--text-xl);
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--space-6);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-bio {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-10);
    line-height: 1.8;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    background: var(--gradient-accent);
    color: var(--color-bg-primary);
    font-weight: 600;
    font-size: var(--text-base);
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px var(--color-accent-glow), 0 10px 30px rgba(0, 212, 255, 0.3);
}

.cta-icon {
    width: 20px;
    height: 20px;
    transition: var(--transition-base);
}

.hero-cta:hover .cta-icon {
    transform: translate(4px, 4px);
}

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-10);
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    animation: fadeIn 0.8s ease 0.5s forwards;
}

.scroll-mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--color-text-muted);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 2px;
    animation: scrollWheel 1.5s ease infinite;
}

/* ============================================
   Section Styles
   ============================================ */
section {
    padding: var(--space-24) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
    opacity: 0;
    transform: translateY(20px);
}

.section-header.visible {
    animation: fadeInUp 0.6s ease forwards;
}

.section-tag {
    display: inline-block;
    color: var(--color-accent);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* ============================================
   Skills Section
   ============================================ */
.skills {
    background: var(--color-bg-secondary);
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
}

.skill-item {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.skill-item.visible {
    animation: fadeInUp 0.5s ease forwards;
}

.skill-item:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* ============================================
   Projects Section
   ============================================ */
.projects {
    background: var(--color-bg-primary);
}

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

.project-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-slow);
    opacity: 0;
    transform: translateY(30px);
}

.project-card.visible {
    animation: fadeInUp 0.6s ease forwards;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(0, 212, 255, 0.2);
}

.project-image-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
}

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

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

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 10, 15, 0.9) 0%, transparent 60%);
    opacity: 0;
    transition: var(--transition-base);
}

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

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

.project-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.project-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-5);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-accent);
    font-size: var(--text-sm);
    font-weight: 600;
    transition: var(--transition-fast);
}

.project-link:hover {
    color: var(--color-accent-hover);
    gap: var(--space-3);
}

.project-link-icon {
    width: 16px;
    height: 16px;
}

/* ============================================
   Experience Section
   ============================================ */
.experience {
    background: var(--color-bg-secondary);
}

.experience-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.experience-item {
    position: relative;
    padding-left: 72px;
    padding-bottom: var(--space-10);
    opacity: 0;
    transform: translateX(-20px);
}

.experience-item:last-child {
    padding-bottom: 0;
}

.experience-item.visible {
    animation: fadeInLeft 0.6s ease forwards;
}

.experience-marker {
    position: absolute;
    left: 12px;
    top: 4px;
    width: 24px;
    height: 24px;
    background: var(--color-bg-primary);
    border: 3px solid var(--color-accent);
    border-radius: var(--radius-full);
    box-shadow: 0 0 15px var(--color-accent-glow);
}

.experience-card {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: var(--transition-base);
}

.experience-card:hover {
    border-color: rgba(0, 212, 255, 0.2);
    box-shadow: var(--shadow-md);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.experience-title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text-primary);
}

.experience-company {
    font-size: var(--text-base);
    color: var(--color-accent);
    font-weight: 600;
}

.experience-period {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    background: var(--color-bg-tertiary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
}

.experience-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================
   Education Section
   ============================================ */
.education {
    background: var(--color-bg-primary);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-6);
}

.education-card {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.education-card.visible {
    animation: fadeInUp 0.5s ease forwards;
}

.education-card:hover {
    border-color: rgba(0, 212, 255, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.education-degree {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.education-school {
    font-size: var(--text-base);
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.education-period {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.education-period::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
}

.education-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

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

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

.contact-info {
    margin-bottom: var(--space-10);
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    opacity: 0;
    transform: translateY(15px);
}

.contact-item.visible {
    animation: fadeInUp 0.5s ease forwards;
}

.contact-icon {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

.contact-text {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

.contact-link {
    color: var(--color-text-primary);
    transition: var(--transition-fast);
}

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

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
}

.social-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    transition: var(--transition-base);
    opacity: 0;
    transform: scale(0.8);
}

.social-link.visible {
    animation: scaleIn 0.4s ease forwards;
}

.social-link:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.social-icon {
    width: 22px;
    height: 22px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-bg-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: var(--space-8) 0;
}

.footer-content {
    text-align: center;
}

.footer-text {
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

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

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

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

@keyframes fadeInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes scrollWheel {
    0% {
        transform: translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateY(12px);
        opacity: 0;
    }
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .hero-name {
        font-size: var(--text-4xl);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.98);
        flex-direction: column;
        padding: var(--space-6);
        gap: var(--space-4);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        font-size: var(--text-lg);
        padding: var(--space-3) 0;
    }
    
    .hero-name {
        font-size: var(--text-3xl);
    }
    
    .hero-title {
        font-size: var(--text-lg);
    }
    
    .hero-bio {
        font-size: var(--text-base);
    }
    
    .hero-avatar-wrapper {
        width: 120px;
        height: 120px;
    }
    
    .section-title {
        font-size: var(--text-3xl);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .experience-timeline::before {
        left: 16px;
    }
    
    .experience-item {
        padding-left: 48px;
    }
    
    .experience-marker {
        left: 6px;
        width: 20px;
        height: 20px;
    }
    
    .experience-header {
        flex-direction: column;
    }
    
    section {
        padding: var(--space-16) 0;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .nav-container {
        padding: 0 var(--space-4);
    }
    
    .hero-name {
        font-size: var(--text-2xl);
    }
    
    .hero-title {
        font-size: var(--text-base);
    }
    
    .section-title {
        font-size: var(--text-2xl);
    }
    
    .skills-grid {
        gap: var(--space-3);
    }
    
    .skill-item {
        padding: var(--space-2) var(--space-4);
        font-size: var(--text-xs);
    }
    
    .social-link {
        width: 44px;
        height: 44px;
    }
    
    .social-icon {
        width: 20px;
        height: 20px;
    }
}

/* Large Screens */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
    
    .nav-container {
        max-width: 1320px;
    }
}

/* ============================================
   Accessibility
   ============================================ */
@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;
    }
}

/* Focus Styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High Contrast Support */
@media (prefers-contrast: high) {
    :root {
        --color-text-secondary: #c0c0d0;
        --color-text-muted: #9090a0;
    }
}