/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    /* Color Scheme - Easy to customize */
    --color-primary: #000000;
    --color-secondary: #ffffff;
    --color-accent: #d62828;
    --color-text-primary: #000000;
    --color-text-secondary: #666666;
    --color-text-light: #999999;
    --color-background: #ffffff;
    --color-surface: #f8f9fa;
    --color-border: #e9ecef;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xl: 3.5rem;
    --font-size-lg: 2.5rem;
    --font-size-md: 1.5rem;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px 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);
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
}

/* ===== NAVIGATION BAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: all var(--transition-normal);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo a {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.nav-logo a:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-links li a {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-normal);
    position: relative;
}

.nav-links li a:hover {
    color: var(--color-accent);
}

.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-normal);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    gap: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-normal);
}

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

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-secondary);
    border: 2px solid var(--color-accent);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-secondary:hover {
    background-color: var(--color-text-primary);
    color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== LANDING SECTION ===== */
.landing {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-background);
    position: relative;
    padding-top: 80px; /* Account for fixed navbar */
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xxl) 0;
}

.hero-text {
    text-align: left;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-photo {
    width: 350px;
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.15));
    transition: transform var(--transition-normal);
}

.profile-photo:hover {
    transform: scale(1.05);
}

.hero-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== PORTFOLIO SECTION ===== */
.portfolio {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-surface);
}

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

.section-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.section-divider {
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    margin: 0 auto var(--spacing-md);
}

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

/* Project Grid */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

.project-card {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}

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

.project-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
}

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

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

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

.project-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.btn-view-details {
    background-color: var(--color-accent);
    color: var(--color-secondary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-view-details:hover {
    background-color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* ===== FOOTER SECTION ===== */
.footer {
    background-color: var(--color-text-primary);
    color: var(--color-secondary);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-xl);
    align-items: start;
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: #cccccc;
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

.contact-email {
    color: var(--color-accent);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.contact-email:hover {
    color: var(--color-secondary);
}

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

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: #cccccc;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-normal);
}

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

.social-link i {
    font-size: 1.2rem;
    width: 20px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid #333333;
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-divider {
    width: 100%;
    height: 1px;
    background-color: #333333;
    margin-bottom: var(--spacing-lg);
}

.footer-copyright {
    color: #999999;
    font-size: var(--font-size-sm);
}

/* ===== MODAL STYLES ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    padding: var(--spacing-md);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background-color: var(--color-text-primary);
    color: var(--color-secondary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: all var(--transition-normal);
}

.modal-close:hover {
    background-color: var(--color-accent);
    transform: rotate(90deg);
}

.modal-content {
    padding: var(--spacing-xl);
}

.modal-header {
    margin-bottom: var(--spacing-lg);
}

.modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.modal-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.modal-tag {
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.modal-images {
    margin-bottom: var(--spacing-lg);
}

.modal-image {
    width: 100%;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.modal-image:last-child {
    margin-bottom: 0;
}

.modal-description {
    margin-bottom: var(--spacing-lg);
}

.modal-description h3 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.modal-description p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.modal-details {
    margin-bottom: var(--spacing-lg);
}

.modal-details h3 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.tech-stack {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tech-item {
    background-color: var(--color-accent);
    color: var(--color-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

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

.modal-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-accent);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
}

.modal-link:hover {
    background-color: var(--color-accent);
    color: var(--color-secondary);
}

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

/* Large tablets and small desktops */
@media (max-width: 1024px) {
    .project-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* Tablets */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Navigation */
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-background);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        box-shadow: var(--shadow-md);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li a {
        font-size: var(--font-size-md);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Hero Section */
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .hero-text {
        text-align: center;
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .profile-photo {
        width: 250px;
        height: auto;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .social-links {
        flex-direction: row;
        justify-content: center;
    }
    
    .modal-content {
        padding: var(--spacing-lg);
    }
    
    .modal-close {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
}

/* Mobile phones */
@media (max-width: 480px) {
    .landing {
        padding-top: 70px;
    }
    
    .profile-photo {
        width: 200px;
        height: auto;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 250px;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .project-card {
        margin: 0 auto;
        max-width: 350px;
    }
    
    .modal-overlay {
        padding: var(--spacing-sm);
    }
    
    .modal {
        max-height: 95vh;
    }
    
    .modal-content {
        padding: var(--spacing-md);
    }
    
    .modal-links {
        flex-direction: column;
    }
    
    .modal-link {
        text-align: center;
    }
    
    .footer-title {
        font-size: 1.75rem;
    }
    
    .contact-email {
        font-size: 1.125rem;
    }
}

/* Extra small screens */
@media (max-width: 320px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card {
        max-width: 280px;
    }
}

/* ===== ACCESSIBILITY & PERFORMANCE ===== */

/* Focus styles for keyboard navigation */
button:focus,
a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text-secondary: #000000;
        --color-border: #000000;
    }
}

/* Print styles */
@media print {
    .modal-overlay,
    .btn-view-details {
        display: none;
    }
    
    .project-card {
        break-inside: avoid;
    }
    
    body {
        background: white;
        color: black;
    }
}