/* ============================================
   MODERN PORTFOLIO - MAIN CSS
   ============================================ */

:root {
    --primary-color: #3b82f6;
    --secondary-color: #1f2937;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f9fafb;
    --bg-dark: #ffffff;
    --border-color: #e5e7eb;
    --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);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   BASE STYLES
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-dark);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
}

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

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.25rem;
    font-weight: 700;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

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

/* ============================================
   UTILITIES
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.highlight {
    color: var(--primary-color);
    font-weight: 700;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-primary);
}

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    gap: 1rem;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-bracket {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex: 1;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 5px 0;
    transition: var(--transition);
}

/* ============================================
   LANGUAGE & THEME TOGGLES
   ============================================ */

.language-toggle {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.lang-btn {
    background-color: var(--bg-light);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

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

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

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0 10px;
}

.theme-toggle:hover {
    transform: scale(1.2) rotate(20deg);
}

/* ============================================
   DARK MODE STYLES
   ============================================ */

body.dark-theme {
    background-color: var(--bg-dark);
    color: var(--text-primary);
}

body.dark-theme .navbar {
    background-color: rgba(17, 24, 39, 0.95);
    border-bottom-color: var(--border-color);
}

body.dark-theme .project-card {
    background-color: var(--bg-light);
}

body.dark-theme .skill-category {
    background-color: var(--bg-light);
}

body.dark-theme .info-box {
    background-color: var(--bg-light);
}

body.dark-theme .timeline-content {
    background-color: var(--bg-light);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
    padding: 60px 0;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

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

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    color: white;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    animation: slideInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1rem;
    animation: slideInUp 0.8s ease-out 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
    line-height: 1.8;
    animation: slideInUp 0.8s ease-out 0.4s both;
}

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

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    animation: slideInUp 0.8s ease-out 0.6s both;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    padding: 12px 28px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #f97316;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

/* ============================================
   SOCIAL LINKS
   ============================================ */

.social-links {
    display: flex;
    gap: 1.5rem;
    animation: slideInUp 0.8s ease-out 0.8s both;
}

.social-links a {
    color: white;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--accent-color);
    transform: translateY(-5px);
}

.social-links svg {
    width: 24px;
    height: 24px;
}

.profile-image {
    width: 100%;
    max-width: 400px;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    animation: slideInRight 0.8s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: white;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

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

.about {
    padding: 80px 0;
    background-color: var(--bg-light);
}

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

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.personal-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.info-item {
    display: flex;
    flex-direction: column;
}

.info-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

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

.skills {
    padding: 80px 0;
    background-color: var(--bg-dark);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.skill-category {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.skill-category:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.category-title {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.skill-tag:hover {
    background-color: var(--accent-color);
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */

.experience {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.timeline {
    position: relative;
    padding: 2rem 0;
}

.experience-timeline {
    position: relative;
    padding: 2rem 0;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--border-color);
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: 0;
    margin-right: auto;
    width: 48%;
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
    margin-right: 0;
    width: 48%;
    text-align: left;
}

.timeline-marker {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border: 4px solid var(--bg-dark);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--primary-color);
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border: 4px solid var(--bg-dark);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--primary-color);
}

.timeline-dot.active {
    width: 20px;
    height: 20px;
    box-shadow: 0 0 0 8px var(--primary-color), 0 0 20px var(--primary-color);
}

.timeline-content {
    background-color: var(--bg-dark);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border-left: 3px solid var(--primary-color);
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

.timeline-content .company {
    color: var(--accent-color);
    font-weight: 600;
}

.timeline-content .period {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.timeline-content .location {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.achievements {
    list-style: none;
    padding-left: 0;
}

.achievements li {
    color: var(--text-secondary);
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    position: relative;
}

.achievements li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

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

.portfolio {
    padding: 80px 0;
    background-color: var(--bg-dark);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-10px);
}

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

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

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.project-link {
    background-color: var(--accent-color);
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
}

.project-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-content h3 {
    margin-bottom: 0.75rem;
}

.project-content p {
    flex-grow: 1;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tags span {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* ============================================
   EDUCATION SECTION
   ============================================ */

.education {
    padding: 80px 0;
    background-color: var(--bg-light);
}

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

.education-list {
    max-width: 800px;
    margin: 0 auto;
}

.education-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.education-item:last-child {
    border-bottom: none;
}

.edu-year {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.edu-content h3 {
    margin-bottom: 0.5rem;
}

.edu-school {
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

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

.contact {
    padding: 80px 0;
    background-color: var(--bg-dark);
}

.contact-subtitle {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.info-box {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
}

.info-box h3 {
    margin-bottom: 1rem;
}

.contact-list {
    list-style: none;
}

.contact-list li {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.contact-list a {
    color: var(--primary-color);
    font-weight: 500;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input,
.form-group textarea {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
}

.heart {
    color: #ef4444;
}

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

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        gap: 0.5rem;
    }

    .nav-menu.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .language-toggle {
        gap: 0.25rem;
    }

    .lang-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }

    .theme-toggle {
        padding: 0 5px;
        font-size: 1.25rem;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        width: 100%;
        margin-left: 0;
        margin-right: 0;
        text-align: left;
    }

    .timeline-marker {
        left: 0;
        transform: translateX(-8px);
    }

    .timeline-content {
        margin-left: 2rem;
        border-left: 3px solid var(--primary-color);
    }

    .education-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

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

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

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero {
        padding: 40px 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }

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

    .personal-info {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ANIMATIONS & TRANSITIONS
   ============================================ */

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(50px);
    }
}

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

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px rgba(59, 130, 246, 0.5);
    }
    50% {
        box-shadow: 0 0 15px rgba(59, 130, 246, 0.8);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

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

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

.slide-in-up {
    animation: slideInUp 0.6s ease-out;
}

/* Hover animasyonları */
.skill-tag {
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.skill-tag:hover {
    animation: bounce 0.6s ease;
    transform: scale(1.1) !important;
}

.project-card {
    animation: fadeIn 0.6s ease-out;
}

.project-card:hover {
    animation: glow 2s ease-in-out infinite;
}

.timeline-item {
    animation: slideInLeft 0.6s ease-out;
}

.btn:active {
    animation: pulse 0.3s ease;
}

/* Link hover efektleri */
.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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