/* ===================================
   ROOT & VARIABLES
   =================================== */
:root {
    /* Colors */
    --bg-dark: #0a0e27;
    --bg-dark-secondary: #0f1436;
    --bg-accent: #1a1f3a;
    --primary-neon: #00d9ff;
    --secondary-neon: #a855f7;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #2a2f4a;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Typography */
    --font-primary: 'Montserrat', sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-2xl: 2.5rem;
    --font-size-3xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* ===================================
   GLOBAL STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

.section-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* Fade-in animation for scroll-triggered elements */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp var(--transition-slow) ease-out;
}

/* ===================================
   NAVIGATION BAR
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(10, 14, 39, 0.98);
    box-shadow: 0 4px 20px rgba(0, 217, 255, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-neon);
    text-decoration: none;
    transition: transform var(--transition-normal);
}

.nav-logo:hover {
    transform: scale(1.05);
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-dot {
    width: 8px;
    height: 8px;
    background-color: var(--secondary-neon);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
    font-weight: 500;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-neon), var(--secondary-neon));
    transition: width var(--transition-fast);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--primary-neon);
    margin: 5px 0;
    transition: all var(--transition-normal);
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    margin-top: 70px;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-accent) 100%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    max-width: 1200px;
    width: 100%;
    padding: 0 var(--spacing-md);
    z-index: 2;
}

.hero-content {
    max-width: 600px;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    font-weight: 700;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--primary-neon);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.hero-description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

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

.hero-image {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.profile-img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 12px;
    border: 3px solid var(--primary-neon);
    box-shadow: 0 0 40px rgba(0, 217, 255, 0.4), inset 0 0 40px rgba(168, 85, 247, 0.1);
    transition: all var(--transition-normal);
    object-fit: cover;
    filter: contrast(1.2) saturate(1.1) brightness(1.05) drop-shadow(0 20px 40px rgba(0, 217, 255, 0.3));
}

.profile-img:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 0 60px rgba(0, 217, 255, 0.6), 0 20px 50px rgba(168, 85, 247, 0.4), inset 0 0 40px rgba(168, 85, 247, 0.15);
    filter: contrast(1.3) saturate(1.2) brightness(1.1) drop-shadow(0 30px 60px rgba(0, 217, 255, 0.5));
}

.btn {
    padding: 12px 30px;
    border: 2px solid transparent;
    border-radius: 5px;
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    color: var(--bg-dark);
    border-color: transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-neon);
    border-color: var(--primary-neon);
}

.btn-secondary:hover {
    background: rgba(0, 217, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
}

/* Animated background shapes */
.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    z-index: 1;
}

.cube {
    position: absolute;
    width: 300px;
    height: 300px;
    border: 2px solid var(--primary-neon);
    top: 50%;
    right: 10%;
    transform: translate(0, -50%) rotateX(45deg) rotateY(45deg);
    animation: rotateCube 20s linear infinite;
}

.sphere {
    position: absolute;
    width: 200px;
    height: 200px;
    border: 2px solid var(--secondary-neon);
    border-radius: 50%;
    bottom: 10%;
    left: 5%;
    animation: float 6s ease-in-out infinite;
}

@keyframes rotateCube {
    0% { transform: translate(0, -50%) rotateX(45deg) rotateY(0deg); }
    100% { transform: translate(0, -50%) rotateX(45deg) rotateY(360deg); }
}

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

/* ===================================
   ABOUT SECTION
   =================================== */
.about {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-dark-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.about-text {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.8;
}

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

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

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.stat-card {
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(168, 85, 247, 0.1));
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    border-radius: 8px;
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.stat-card:hover {
    border-color: var(--primary-neon);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ===================================
   EDUCATION SECTION
   =================================== */
.education {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-dark);
}

.timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, var(--primary-neon), transparent);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    align-items: center;
}

.timeline-item:nth-child(even) .timeline-content {
    grid-column: 1;
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-marker {
    grid-column: 2;
    justify-self: start;
}

.timeline-marker {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    border-radius: 50%;
    justify-self: center;
    box-shadow: 0 0 20px var(--primary-neon);
}

.timeline-content {
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(168, 85, 247, 0.05));
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    border-radius: 8px;
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    border-color: var(--primary-neon);
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(168, 85, 247, 0.1));
}

.timeline-title {
    font-size: var(--font-size-xl);
    color: var(--primary-neon);
    margin-bottom: var(--spacing-sm);
}

.timeline-subtitle {
    font-size: var(--font-size-base);
    color: var(--secondary-neon);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

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

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

.tag {
    display: inline-block;
    padding: 5px 12px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid var(--primary-neon);
    color: var(--primary-neon);
    border-radius: 20px;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-neon);
    color: var(--bg-dark);
}

/* ===================================
   SKILLS SECTION
   =================================== */
.skills {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-dark-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.skill-category {
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(168, 85, 247, 0.05));
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    border-radius: 8px;
    transition: all var(--transition-normal);
}

.skill-category:hover {
    border-color: var(--secondary-neon);
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.15);
}

.category-title {
    font-size: var(--font-size-lg);
    color: var(--secondary-neon);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

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

.skill-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.skill-name {
    color: var(--text-primary);
    font-weight: 500;
}

.skill-bar {
    width: 100%;
    height: 8px;
    background-color: rgba(0, 217, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-neon), var(--secondary-neon));
    border-radius: 4px;
    transition: width 1.5s ease-out;
}

/* ===================================
   PROJECTS SECTION
   =================================== */
.projects {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-dark);
}

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

.project-card {
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(168, 85, 247, 0.05));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--primary-neon);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 217, 255, 0.2);
}

.project-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(168, 85, 247, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1f3a, #2a2f4a);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--primary-neon);
    font-weight: 600;
    transition: all var(--transition-normal);
}

.project-card:hover .placeholder-image {
    background: linear-gradient(135deg, #2a2f4a, #3a3f5a);
}

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

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

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    flex: 1;
    line-height: 1.6;
}

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

/* ===================================
   CONTACT SECTION
   =================================== */
.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-dark-secondary);
    border-top: 1px solid var(--border-color);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.contact-form {
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(168, 85, 247, 0.05));
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    border-radius: 8px;
}

.form-group {
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.form-group label {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    background-color: rgba(0, 217, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-sm);
    border-radius: 4px;
    font-family: var(--font-primary);
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-neon);
    background-color: rgba(0, 217, 255, 0.1);
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.2);
}

.contact-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-info h3 {
    font-size: var(--font-size-lg);
    color: var(--primary-neon);
    margin-bottom: var(--spacing-lg);
}

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

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(168, 85, 247, 0.05));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.contact-link:hover {
    border-color: var(--primary-neon);
    background: rgba(0, 217, 255, 0.1);
}

.contact-icon {
    font-size: 1.5rem;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background-color: var(--bg-dark);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer-content {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-content p {
    margin: var(--spacing-sm) 0;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    /* Navigation */
    .nav-menu {
        position: absolute;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-dark);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        gap: 0;
        padding: var(--spacing-md) 0;
        border-bottom: 1px solid var(--border-color);
    }

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

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

    .hamburger {
        display: flex;
    }

    /* Hero Section */
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
        margin-top: 70px;
    }

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

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

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

    .hero-buttons {
        justify-content: center;
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .hero-image {
        order: -1;
    }

    .profile-img {
        max-width: 300px;
    }

    /* About Section */
    .about-content {
        grid-template-columns: 1fr;
    }

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

    /* Education Timeline */
    .timeline::before {
        left: 0;
    }

    .timeline-item {
        grid-template-columns: 1fr;
    }

    .timeline-item:nth-child(even) .timeline-content {
        grid-column: 1;
        text-align: left;
    }

    .timeline-item:nth-child(even) .timeline-marker {
        grid-column: 1;
        justify-self: start;
        margin-left: var(--spacing-md);
    }

    .timeline-marker {
        justify-self: start;
        margin-left: var(--spacing-md);
    }

    .timeline-content {
        margin-left: var(--spacing-lg);
    }

    /* Skills Grid */
    .skills-grid {
        grid-template-columns: 1fr;
    }

    /* Projects Grid */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Contact */
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    /* Text sizes */
    .section-title {
        font-size: var(--font-size-xl);
    }

    /* Spacing adjustments */
    .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    /* Root font sizes */
    :root {
        --font-size-xl: 1.5rem;
        --font-size-2xl: 2rem;
        --font-size-3xl: 2rem;
    }

    /* Hero section */
    .hero-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
    }

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

    /* Projects cards */
    .project-image {
        height: 150px;
    }

    /* Contact form */
    .contact-form {
        padding: var(--spacing-md);
    }

    /* Navigation */
    .logo-text {
        font-size: var(--font-size-lg);
    }

    /* Spacing */
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 2.5rem;
    }
}