/* ===== VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #6c63ff;
    --secondary-color: #4a45b1;
    --accent-color: #ff6b6b;
    --background-color: #0a0a0a;
    --surface-color: #121212;
    --surface-color-light: #1e1e1e;
    --text-color: #ffffff;
    --text-color-secondary: #b3b3b3;
    --success-color: #4caf50;
    --error-color: #f44336;
    --border-color: #2a2a2a;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 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: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Borders */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    
    /* Z-index */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;
}

/* ===== RESET & BASE STYLES ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--background-color);
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
}

::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: var(--border-radius-full);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-normal);
}

ul, ol {
    list-style: none;
}

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

button, input, textarea, select {
    font: inherit;
    color: inherit;
    background: none;
    border: none;
    outline: none;
}

button {
    cursor: pointer;
}

/* ===== LOADING SCREEN ===== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: var(--z-index-modal);
    transition: opacity var(--transition-slow);
}

.loader {
    width: 50px;
    height: 50px;
    border: 3px solid var(--surface-color-light);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

.loading-screen p {
    font-size: var(--font-size-md);
    color: var(--text-color-secondary);
    letter-spacing: 1px;
}

/* ===== 3D BACKGROUND CANVAS ===== */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.6;
}

/* ===== NAVIGATION ===== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-2xl);
    z-index: var(--z-index-fixed);
    transition: background-color var(--transition-normal), padding var(--transition-normal);
}

nav.scrolled {
    background-color: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md) var(--spacing-2xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-links a {
    font-size: var(--font-size-md);
    font-weight: 500;
    color: var(--text-color);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
}

/* ===== MAIN CONTENT ===== */
main {
    width: 100%;
    overflow: hidden;
}

section {
    padding: var(--spacing-3xl) var(--spacing-2xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.underline {
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    margin: 0 auto;
    position: relative;
}

.underline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background-color: var(--accent-color);
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    z-index: 1;
}

.hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-color-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero p {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.highlight {
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: rgba(108, 99, 255, 0.2);
    z-index: -1;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    transition: width var(--transition-normal);
    z-index: -1;
}

.btn:hover::before {
    width: 100%;
}

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

.btn.primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(108, 99, 255, 0.3);
}

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

.btn.secondary:hover {
    color: white;
    background-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(108, 99, 255, 0.3);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: bounce 2s infinite;
}

.scroll-indicator p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
    color: var(--text-color-secondary);
}

.scroll-indicator i {
    font-size: var(--font-size-lg);
    color: var(--primary-color);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* ===== ABOUT SECTION ===== */
.about {
    background-color: var(--surface-color);
}

.about-content {
    display: flex;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-image {
    flex: 1;
    max-width: 400px;
}

.image-container {
    position: relative;
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.image-container::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    width: calc(100% - 40px);
    height: calc(100% - 40px);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius-md);
    z-index: -1;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom right, rgba(108, 99, 255, 0.2), rgba(255, 107, 107, 0.2));
}

.about-text {
    flex: 1.5;
}

.about-text h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-color-secondary);
}

.personal-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.info-item {
    display: flex;
    align-items: center;
}

.info-label {
    font-weight: 600;
    margin-right: var(--spacing-sm);
    color: var(--text-color);
}

.info-value {
    color: var(--text-color-secondary);
}

.info-value.available {
    color: var(--success-color);
}

.download-cv {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.download-cv i {
    font-size: var(--font-size-md);
}

/* ===== SKILLS SECTION ===== */
.skills-content {
    max-width: 1200px;
    margin: 0 auto;
}

.skills-text {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.skills-categories {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.skill-category h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    text-align: center;
}

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

.skill-item {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.skill-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--primary-color);
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.skill-icon {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.skill-name {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.skill-bar {
    width: 100%;
    height: 6px;
    background-color: var(--surface-color-light);
    border-radius: var(--border-radius-full);
    overflow: hidden;
}

.skill-level {
    height: 100%;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    border-radius: var(--border-radius-full);
    position: relative;
}

/* ===== PROJECTS SECTION ===== */
.projects {
    background-color: var(--surface-color);
}

.projects-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--surface-color-light);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background-color: var(--surface-color-light);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.project-img {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

.project-card:hover .project-img img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(10, 10, 10, 0.2), rgba(10, 10, 10, 0.8));
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link, .project-github {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: var(--font-size-md);
    transition: all var(--transition-normal);
    transform: translateY(20px);
    opacity: 0;
}

.project-card:hover .project-link, .project-card:hover .project-github {
    transform: translateY(0);
    opacity: 1;
}

.project-link:hover, .project-github:hover {
    background-color: var(--secondary-color);
    transform: scale(1.1);
}

.project-github {
    transition-delay: 0.1s;
}

.project-info {
    padding: var(--spacing-lg);
}

.project-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

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

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

.project-tech span {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(108, 99, 255, 0.1);
    color: var(--primary-color);
    border-radius: var(--border-radius-sm);
}

/* ===== CONTACT SECTION ===== */
.contact-content {
    display: flex;
    gap: var(--spacing-3xl);
    max-width: 1200px;
    margin: 0 auto;
}

.contact-info {
    flex: 1;
}

.contact-info h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.contact-info p {
    margin-bottom: var(--spacing-xl);
    color: var(--text-color-secondary);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(108, 99, 255, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary-color);
    font-size: var(--font-size-lg);
}

.contact-text h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.contact-text p {
    font-size: var(--font-size-sm);
    color: var(--text-color-secondary);
    margin-bottom: 0;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--surface-color-light);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-color);
    font-size: var(--font-size-md);
    transition: all var(--transition-normal);
}

.social-link:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-5px);
}

.contact-form-container {
    flex: 1.5;
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.contact-form-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.form-group input, .form-group textarea {
    padding: var(--spacing-md);
    background-color: var(--surface-color-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-color);
    transition: border-color var(--transition-normal);
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
}

.submit-btn {
    margin-top: var(--spacing-md);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.submit-btn i {
    font-size: var(--font-size-md);
}

/* ===== FOOTER ===== */
footer {
    background-color: var(--surface-color);
    padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-md);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.footer-text {
    color: var(--text-color-secondary);
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-color-secondary);
    font-size: var(--font-size-sm);
}

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 1200px) {
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    
    .about-image {
        margin: 0 auto var(--spacing-xl);
    }
    
    .personal-info {
        justify-content: center;
    }
    
    .contact-content {
        flex-direction: column;
    }
    
    .contact-info {
        margin-bottom: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }
    
    nav {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--surface-color);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right var(--transition-normal);
        z-index: var(--z-index-modal);
    }
    
    .nav-links.active {
        right: 0;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
    }
    
    .menu-toggle {
        display: block;
        z-index: var(--z-index-modal-backdrop);
    }
    
    section {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .hero h1 {
        font-size: var(--font-size-4xl);
    }
    
    .hero h2 {
        font-size: var(--font-size-xl);
    }
    
    .hero p {
        font-size: var(--font-size-md);
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .skills-grid, .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .personal-info {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
    }
    
    .section-header {
        margin-bottom: var(--spacing-xl);
    }
    
    .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .hero h2 {
        font-size: var(--font-size-lg);
    }
    
    .projects-filter {
        flex-direction: column;
        align-items: center;
    }
}