/* ==========================================
   ROOT & GENERAL STYLES
   ========================================== */

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f97316;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --text-color: #374151;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* Gradients */
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    --accent-gradient: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    --light-gradient: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 40px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    color: var(--text-color);
    background-color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */

h1, h2, h3, h4, h5, h6 {
    color: var(--dark-color);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--secondary-color);
}

/* ==========================================
   LAYOUT & CONTAINER
   ========================================== */

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

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */

.header {
    background: #ffffff;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-lg);
}

.navbar {
    padding: var(--spacing-md) 0;
}

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

.logo h1 {
    font-size: var(--font-size-xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-color);
    font-weight: 500;
    transition: color var(--transition-base);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--dark-color);
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--spacing-3xl) var(--spacing-md);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    z-index: -1;
    animation: gradientShift 8s ease-in-out infinite;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(249, 115, 22, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
    animation: float 6s ease-in-out infinite;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #ffffff;
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease-out;
    color: #ffffff;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.4s backwards;
}

.cta-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--accent-gradient);
    color: #ffffff;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 1s ease-out 0.6s backwards;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 35px -5px rgba(249, 115, 22, 0.3);
    color: #ffffff;
}

/* ==========================================
   PORTFOLIO SECTION
   ========================================== */

.portfolio {
    padding: var(--spacing-3xl) var(--spacing-md);
    background: var(--light-gradient);
}

.section-title {
    text-align: center;
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    text-align: center;
    color: var(--text-color);
    margin-bottom: var(--spacing-3xl);
    font-size: var(--font-size-lg);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

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

.project-image {
    width: 100%;
    height: 200px;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-base);
}

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

/* Project-specific gradient backgrounds */
.project-image-1 { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.project-image-2 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.project-image-3 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.project-image-4 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.project-image-5 { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.project-image-6 { background: linear-gradient(135deg, #30cfd0 0%, #330867 100%); }

.project-content {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-content h3 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.project-content p {
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.project-tags {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    background: #f0f4f8;
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.project-btn {
    align-self: flex-start;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary-gradient);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-base);
}

.project-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

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

.about {
    padding: var(--spacing-3xl) var(--spacing-md);
    background: #ffffff;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    margin-top: var(--spacing-2xl);
}

.about-text {
    color: var(--text-color);
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.stat-item {
    background: var(--light-gradient);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-item h4 {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stat-item p {
    margin: 0;
    color: var(--text-color);
    font-weight: 500;
}

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

.skills {
    padding: var(--spacing-3xl) var(--spacing-md);
    background: var(--light-gradient);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.skill-card {
    background: #ffffff;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.skill-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.skill-card p {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.skill-level {
    width: 100%;
    height: 8px;
    background: #e5e7eb;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.skill-bar {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    transition: width 1s ease-out;
    animation: fillBar 1s ease-out forwards;
}

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

.contact {
    padding: var(--spacing-3xl) var(--spacing-md);
    background: var(--dark-color);
    color: #ffffff;
}

.contact .section-title {
    color: #ffffff;
}

.contact .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-2xl);
}

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

.contact-item h4 {
    color: #ffffff;
    margin-bottom: var(--spacing-sm);
}

.contact-item a {
    color: var(--accent-color);
    font-weight: 500;
}

.contact-item a:hover {
    color: #ffffff;
}

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

.social-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: #ffffff;
    transition: all var(--transition-base);
}

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

.form-group label {
    color: #ffffff;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-md);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

.submit-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    align-self: flex-start;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(249, 115, 22, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

.form-message {
    margin: 0;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: none;
}

.form-message.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
    display: block;
}

.form-message.error {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
    display: block;
}

/* ==========================================
   MODAL
   ========================================== */

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: #ffffff;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: slideIn var(--transition-base);
    box-shadow: var(--shadow-xl);
}

.modal-content h3 {
    margin-top: 0;
    color: var(--dark-color);
}

.modal-content img {
    width: 100%;
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--text-color);
    transition: color var(--transition-base);
}

.modal-close:hover {
    color: var(--primary-color);
}

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

.footer {
    background: #1a1a1a;
    color: #ffffff;
    padding: var(--spacing-3xl) var(--spacing-md) var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    margin: 0;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-base);
}

.footer-section ul li a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

.footer-bottom p {
    margin: var(--spacing-xs) 0;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes gradientShift {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.95;
    }
}

@keyframes fillBar {
    from {
        width: 0;
    }
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

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

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

/* Tablet (768px and below) */
@media (max-width: 768px) {
    :root {
        --font-size-base: 14px;
        --font-size-2xl: 28px;
        --font-size-3xl: 32px;
        --spacing-xl: 24px;
        --spacing-2xl: 32px;
        --spacing-3xl: 40px;
    }

    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #ffffff;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-md);
        gap: 0;
        padding: var(--spacing-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        padding: var(--spacing-md) 0;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

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

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

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

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

    .section-title {
        font-size: var(--font-size-xl);
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    :root {
        --font-size-base: 13px;
        --font-size-xl: 20px;
        --font-size-2xl: 24px;
        --font-size-3xl: 28px;
        --spacing-lg: 16px;
        --spacing-xl: 16px;
        --spacing-2xl: 24px;
        --spacing-3xl: 32px;
    }

    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
        min-height: auto;
    }

    .hero-title {
        font-size: var(--font-size-xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .cta-button {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

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

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

    .nav-menu {
        top: 60px;
    }

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

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

/* Large screens (1200px and above) */
@media (min-width: 1200px) {
    .container {
        padding: 0 var(--spacing-xl);
    }

    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .about-stats {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Accessibility: Reduce motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Accessibility: High contrast mode */
@media (prefers-contrast: more) {
    :root {
        --border-color: #000000;
    }

    .nav-link {
        border-bottom: 2px solid transparent;
    }

    .nav-link:focus {
        border-bottom-color: var(--primary-color);
        outline: 2px solid var(--primary-color);
    }
}

/* Focus states for better accessibility */
button:focus,
a:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}