/* ========================================
   Emirhan Eren Portfolio - Main Stylesheet
   Modern, responsive design with dark theme
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #0066FF;
    --secondary-color: #4DA6FF;
    --accent-color: #00D4FF;
    --background-dark: #0A0A0A;
    --background-darker: #000000;
    --background-card: #1A1A1A;
    --text-light: #FFFFFF;
    --text-muted: #B0B0B0;
    --text-dark: #666666;
    --border-color: #333333;
    --success-color: #00C851;
    --error-color: #FF4444;
    --warning-color: #FF8800;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0066FF 0%, #4DA6FF 100%);
    --gradient-secondary: linear-gradient(135deg, #4DA6FF 0%, #00D4FF 100%);
    --gradient-dark: linear-gradient(135deg, #1A1A1A 0%, #0A0A0A 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-weight: var(--font-weight-medium);
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: #31274F;
    color: var(--text-light);
    box-shadow: 0 4px 15px rgba(49, 39, 79, 0.3);
    border: 2px solid #31274F;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: #4a3a6b;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(49, 39, 79, 0.4);
    color: var(--text-light);
    border-color: #4a3a6b;
}

.btn-secondary {
    background: transparent;
    color: #31274F;
    border: 2px solid #31274F;
    box-shadow: 0 4px 15px rgba(49, 39, 79, 0.2);
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: #31274F;
    color: var(--text-light);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(49, 39, 79, 0.3);
}

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

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-light);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-muted);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

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

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

.student-login-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.student-login-btn:hover {
    background: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.lang-link {
    color: var(--text-light);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.lang-link.active {
    color: var(--primary-color);
}

.lang-separator {
    color: var(--text-light);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-light);
    transition: all var(--transition-normal);
}

/* Page Header */
.page-header {
    padding: 120px 0 var(--spacing-xl);
    text-align: center;
    background: var(--gradient-dark);
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Section Titles */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--spacing-xxl);
    background: var(--gradient-dark);
    position: relative;
    overflow: visible;
    z-index: 1;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23333" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.1;
    z-index: -1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text h2 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-normal);
}

.hero-text p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-muted);
}

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

.profile-card {
    background: var(--background-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    text-align: center;
}

.profile-avatar {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--background-darker);
    border-radius: 50%;
    color: var(--text-muted);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.social-links a:hover {
    background: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Quick About Section */
.quick-about {
    padding: var(--spacing-xxl) 0;
    background: var(--background-dark);
    position: relative;
    z-index: 2;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    width: 100%;
    box-sizing: border-box;
}

.about-card {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    width: 100%;
    box-sizing: border-box;
    margin-bottom: var(--spacing-md);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.about-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--text-light);
}

.about-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

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

/* Featured Projects */
.featured-projects {
    padding: var(--spacing-xxl) 0;
    background: var(--gradient-dark);
    position: relative;
    z-index: 2;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.project-showcase {
    background: var(--background-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.project-showcase:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.project-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
}

.project-image {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.placeholder-image {
    width: 100%;
    height: 250px;
    background: var(--background-darker);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    border-radius: var(--radius-md);
}

.placeholder-image i {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.project-category {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
}

.project-info h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin: var(--spacing-md) 0;
}

.tech-tag {
    background: var(--background-darker);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    border: 1px solid var(--primary-color);
}

.project-features h4 {
    color: var(--text-light);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.project-features ul {
    list-style: none;
    padding: 0;
}

.project-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-muted);
    position: relative;
    padding-left: var(--spacing-md);
}

.project-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: var(--font-weight-bold);
}

.status-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    margin-top: var(--spacing-sm);
}

.status-badge.in-development {
    background: var(--warning-color);
    color: var(--text-light);
}

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

/* Project Gallery */
.project-gallery {
    padding: var(--spacing-xxl) 0;
    background: var(--background-dark);
}

.project-filters {
    padding: var(--spacing-lg) 0;
    background: var(--background-card);
    border-bottom: 1px solid var(--border-color);
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: var(--font-weight-medium);
}

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

.project-card {
    background: var(--background-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

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

.project-content h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

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

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

.no-projects {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--text-muted);
}

.no-projects i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

/* Education & Experience */
.education,
.experience {
    padding: var(--spacing-xxl) 0;
}

.education {
    background: var(--background-dark);
}

.experience {
    background: var(--gradient-dark);
}

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

.education-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}

.timeline-item {
    display: flex;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.5rem;
    margin-right: var(--spacing-lg);
    position: relative;
    z-index: 1;
    border: 4px solid var(--background-dark);
}

.timeline-content {
    flex: 1;
    background: var(--background-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.timeline-content h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-xs);
}

.timeline-date {
    display: inline-block;
    background: var(--primary-color);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.experience-card {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.experience-header {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.experience-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.5rem;
    margin-right: var(--spacing-md);
}

.experience-info h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.experience-info h4 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-xs);
}

.experience-period {
    color: var(--primary-color);
    font-weight: var(--font-weight-medium);
    font-size: 0.875rem;
}

/* Personal Info */
.personal-info {
    padding: var(--spacing-xxl) 0;
    background: var(--background-dark);
}

.personal-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 20px;
}

.personal-text {
    text-align: center;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.personal-text h2 {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.personal-text p {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.personal-highlights {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.highlight-item {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    text-align: center;
    width: 100%;
}

.highlight-item i {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.highlight-item h4 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.highlight-item p {
    color: var(--text-muted);
    margin: 0;
}

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

.image-container img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    padding: var(--spacing-xl);
    color: var(--text-light);
}

.overlay-content h3 {
    margin-bottom: var(--spacing-xs);
}

.overlay-content p {
    margin: 0;
    color: var(--secondary-color);
}

/* Skills */
.skills-overview,
.technical-skills,
.skill-levels,
.learning-journey {
    padding: var(--spacing-xxl) 0;
}

.skills-overview {
    background: var(--background-dark);
}

.technical-skills {
    background: var(--gradient-dark);
}

.skill-levels {
    background: var(--background-dark);
}

.learning-journey {
    background: var(--gradient-dark);
}

.skills-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.skills-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.skill-category {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.category-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.category-header i {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.5rem;
    margin-right: var(--spacing-md);
}

.category-header h3 {
    color: var(--text-light);
    margin: 0;
}

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

.skill-item {
    margin-bottom: var(--spacing-md);
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.skill-name {
    color: var(--text-light);
    font-weight: var(--font-weight-medium);
}

.skill-level {
    color: var(--primary-color);
    font-weight: var(--font-weight-medium);
    font-size: 0.875rem;
}

.skill-bar {
    width: 100%;
    height: 8px;
    background: var(--background-darker);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    transition: width 1s ease;
}

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

.skill-group {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.skill-group h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.skill-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    border: 1px solid;
}

.skill-tag.expert {
    background: var(--success-color);
    color: var(--text-light);
    border-color: var(--success-color);
}

.skill-tag.good {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

.skill-tag.intermediate {
    background: var(--warning-color);
    color: var(--text-light);
    border-color: var(--warning-color);
}

.skill-tag.beginner {
    background: var(--text-dark);
    color: var(--text-light);
    border-color: var(--text-dark);
}

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

.level-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.level-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

.level-badge.expert {
    background: var(--success-color);
    color: var(--text-light);
}

.level-badge.good {
    background: var(--primary-color);
    color: var(--text-light);
}

.level-badge.intermediate {
    background: var(--warning-color);
    color: var(--text-light);
}

.level-badge.beginner {
    background: var(--text-dark);
    color: var(--text-light);
}

.journey-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.journey-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.journey-year {
    width: 120px;
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: var(--font-weight-bold);
    margin-right: var(--spacing-lg);
    flex-shrink: 0;
}

.journey-content h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.journey-content p {
    margin: 0;
    color: var(--text-muted);
}

/* Contact */
.contact-content {
    padding: var(--spacing-xxl) 0;
    background: var(--background-dark);
    min-height: calc(100vh - 120px);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: start;
    min-height: 600px;
    width: 100%;
    overflow: hidden;
}

.contact-info {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    width: 100%;
    box-sizing: border-box;
}

.contact-info-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.contact-info h2 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.75rem;
}

.contact-info-header p {
    color: var(--text-muted);
    font-size: 1rem;
    margin: 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.contact-item:hover {
    background: var(--background-darker);
    transform: translateX(5px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.25rem;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.contact-details h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.contact-details p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.contact-link {
    color: var(--primary-color);
    font-weight: var(--font-weight-medium);
}

.social-links {
    margin-top: var(--spacing-xl);
}

.social-links h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

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

.social-icons a {
    width: 50px;
    height: 50px;
    background: var(--background-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.social-icons a:hover {
    background: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.contact-form-section {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.contact-form-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.contact-form-section h2 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
}

.contact-form {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

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

.form-group label {
    display: block;
    color: var(--text-light);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background-darker);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-light);
    font-family: var(--font-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-group input.error,
.form-group textarea.error {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(255, 68, 68, 0.1);
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.alert-success {
    background: rgba(0, 200, 81, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.contact-additional {
    padding: var(--spacing-xxl) 0;
    background: var(--gradient-dark);
}

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

.additional-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--background-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.additional-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 2rem;
    margin: 0 auto var(--spacing-md);
}

.additional-item h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.additional-item p {
    color: var(--text-muted);
    margin: 0;
}

/* Blog */
.blog-content {
    padding: var(--spacing-xxl) 0;
    background: var(--background-dark);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.blog-card {
    background: var(--background-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.blog-image {
    height: 200px;
    overflow: hidden;
}

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

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

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

.blog-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.blog-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.blog-title {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.blog-excerpt p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

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

.tag {
    background: var(--background-darker);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    border: 1px solid var(--primary-color);
}

.blog-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.coming-soon {
    text-align: center;
    padding: var(--spacing-xxl) 0;
}

.coming-soon-content {
    max-width: 800px;
    margin: 0 auto;
}

.coming-soon-icon {
    width: 120px;
    height: 120px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 4rem;
    margin: 0 auto var(--spacing-xl);
}

.coming-soon h2 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.coming-soon p {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.coming-soon-features {
    text-align: left;
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.coming-soon-features h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.coming-soon-features ul {
    list-style: none;
    padding: 0;
}

.coming-soon-features li {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    color: var(--text-muted);
}

.coming-soon-features li i {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.coming-soon-cta p {
    margin-bottom: var(--spacing-lg);
}

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

/* Newsletter */
.newsletter {
    padding: var(--spacing-xxl) 0;
    background: var(--gradient-dark);
}

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

.newsletter h2 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.newsletter p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
}

.newsletter-form {
    background: var(--background-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.newsletter-form .form-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.newsletter-form input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background-darker);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-light);
    font-family: var(--font-primary);
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.newsletter-note {
    font-size: 0.875rem;
    color: var(--text-dark);
    margin: 0;
}

/* CTA Section */
.cta {
    padding: var(--spacing-xxl) 0;
    background: var(--gradient-dark);
    text-align: center;
    position: relative;
    z-index: 2;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta h2 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.cta p {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

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

/* Footer */
.footer {
    background: var(--background-darker);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    align-items: start;
}

.footer-section {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.footer-section h3,
.footer-section h4 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

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

.footer-section a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--primary-color);
}

.contact-info {
    width: 100%;
    overflow: hidden;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    width: 100%;
    overflow: hidden;
}

.contact-info .contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
    text-decoration: none;
    transition: all var(--transition-fast);
    padding: var(--spacing-xs) 0;
    border-radius: var(--radius-sm);
    width: 100%;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.contact-info .contact-link:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

.contact-info .contact-link i {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-info .contact-link span {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
        position: relative;
        z-index: 2;
    }
    
    .project-detail {
        grid-template-columns: 1fr;
    }
    
    .personal-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        min-height: auto;
    }
    
    .contact-content {
        min-height: auto;
    }
    
    .about-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-md);
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: var(--spacing-lg);
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-lg);
    }
}

@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: var(--spacing-md);
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background-darker);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-top: 1px solid var(--border-color);
        z-index: 1000;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .student-login-btn {
        display: none;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-buttons,
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .timeline-item {
        flex-direction: column;
        text-align: center;
    }
    
    .timeline-icon {
        margin: 0 auto var(--spacing-md);
    }
    
    .education-timeline::before {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .journey-item {
        flex-direction: column;
        text-align: center;
    }
    
    .journey-year {
        margin: 0 auto var(--spacing-md);
    }
    
    .newsletter-form .form-group {
        flex-direction: column;
    }
    
    .filter-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .contact-info,
    .contact-form-section {
        margin-bottom: var(--spacing-lg);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-text h2 {
        font-size: 1.25rem;
    }
    
    .page-header {
        padding: 100px 0 var(--spacing-lg);
    }
    
    .page-header h1 {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .profile-avatar {
        width: 150px;
        height: 150px;
    }
    
    .about-grid,
    .projects-grid,
    .skills-grid,
    .levels-grid,
    .additional-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-categories {
        grid-template-columns: 1fr;
    }
    
    .experience-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .contact-info .contact-link {
        white-space: normal;
        word-break: break-all;
    }
    
    .contact-info .contact-link span {
        white-space: normal;
        word-break: break-all;
    }
}

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

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

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeIn {
    animation: fadeIn 0.6s ease forwards;
}

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

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

/* Loading states */
.loading {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--text-muted);
    font-style: italic;
}

/* Print styles */
@media print {
    .header,
    .footer,
    .nav-toggle,
    .btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero,
    .cta {
        background: white;
    }
}

/* Project Details Structure */
.project-details {
    margin: 16px 0;
}

.project-problem,
.project-solution,
.project-tech-stack {
    margin-bottom: 12px;
}

.project-problem strong,
.project-solution strong,
.project-tech-stack strong {
    color: var(--primary-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: block;
    margin-bottom: 4px;
}

.project-problem p,
.project-solution p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin: 0;
}