/* ==========================================================================
   CSS Variables & Theme Setup
   ========================================================================== */
:root {
    /* Muted Dark Theme - Çok profesyonel ve modern */
    --bg-main: #0B1120;
    --bg-alt: #111827;
    --card-bg: #1F2937;
    --card-hover: #374151;
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --accent-primary: #3B82F6; /* Modern Mavi */
    --accent-primary-hover: #2563EB;
    --accent-secondary: #10B981; /* Başarı & Doğa Yeşili (Projeler için) */
    
    --accent-glow: rgba(59, 130, 246, 0.5);

    --border-color: #334155;
    --border-hover: #475569;

    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    --container-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 90px;
}

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

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 5%;
}

.section {
    padding: 100px 0;
}

.bg-alt {
    background-color: var(--bg-alt);
}

/* Typography Headings */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.2;
}

.highlight {
    color: var(--accent-primary);
    position: relative;
    display: inline-block;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 1rem;
    font-family: var(--font-body);
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition-normal);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

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

.btn-secondary:hover {
    border-color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
    padding: 10px 20px;
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9rem;
}

/* ==========================================================================
   Header & Navbar
   ========================================================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition-normal);
    padding: 24px 0;
    background: transparent;
}

header.scrolled {
    background: rgba(11, 17, 32, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 16px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    font-family: var(--font-heading);
    letter-spacing: -1px;
}

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

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links li a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--text-primary);
}

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

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

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger .bar {
    display: block;
    width: 25px;
    height: 2px;
    margin: 5px auto;
    transition: var(--transition-normal);
    background-color: var(--text-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

.hero-bg-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
}

.shape-1 {
    top: -10%;
    right: -5%;
    width: 500px;
    height: 500px;
    background-color: var(--accent-primary);
}

.shape-2 {
    bottom: 20%;
    left: -10%;
    width: 400px;
    height: 400px;
    background-color: rgba(16, 185, 129, 0.3); /* Green */
}

.hero-content {
    max-width: 750px;
}

.greeting {
    display: inline-block;
    font-size: 1.25rem;
    color: var(--accent-primary);
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.name {
    font-size: clamp(3.5rem, 8vw, 5.5rem);
    line-height: 1.1;
    margin-bottom: 8px;
    letter-spacing: -2px;
}

.title {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 30px;
}

.hero-content .description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-socials {
    display: flex;
    gap: 16px;
}

.social-icon {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.social-icon:hover {
    color: #fff;
    border-color: var(--accent-primary);
    background-color: var(--accent-primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

/* Mouse Scroll Animation */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.mouse {
    width: 28px;
    height: 46px;
    border: 2px solid var(--text-secondary);
    border-radius: 14px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 2px;
    animation: scroll 2s infinite cubic-bezier(0.15, 0.41, 0.69, 0.94);
}

.scroll-indicator:hover .mouse {
    border-color: var(--accent-primary);
}
.scroll-indicator:hover .wheel {
    background-color: var(--accent-primary);
}

@keyframes scroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(15px); opacity: 0; }
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section-header {
    margin-bottom: 60px;
    position: relative;
    display: flex;
    align-items: center;
    gap: 20px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    white-space: nowrap;
}

.title-line {
    height: 1px;
    background-color: var(--border-color);
    flex-grow: 1;
    position: relative;
}

.title-line::after {
    content: '';
    position: absolute;
    left: 0;
    top: -1px;
    width: 60px;
    height: 3px;
    background-color: var(--accent-primary);
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 50px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-text strong {
    color: var(--accent-primary);
    font-weight: 600;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.icon-box {
    width: 60px;
    height: 60px;
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.highlight-item h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.highlight-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0;
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.skill-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    transition: var(--transition-normal);
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.1);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.skill-card h3 {
    font-size: 1.3rem;
    margin-bottom: 24px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-badge {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.skill-badge i {
    font-size: 1rem;
    color: var(--text-secondary);
}

.skill-card:hover .skill-badge {
    border-color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.1);
}

.skill-card:hover .skill-badge i {
    color: var(--accent-primary);
}

.alt-tags .tag {
    background: transparent;
    border: 1px dashed var(--border-color);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

.project-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.project-card:hover .project-icon {
    color: #fff;
}

.project-title {
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 24px;
}

.project-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

.project-tech-list span {
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.project-actions {
    margin-top: auto;
}

/* ==========================================================================
   Experience / Timeline
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 20px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 2px;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 40px;
    margin-bottom: 50px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--bg-main);
    border: 3px solid var(--accent-primary);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

.timeline-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    transition: var(--transition-normal);
}

.timeline-content:hover {
    border-color: var(--text-muted);
}

.timeline-date {
    display: inline-block;
    padding: 4px 12px;
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.timeline-title {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.timeline-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-desc {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.05rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 20px;
}

.method-icon {
    width: 50px;
    height: 50px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--accent-primary);
}

.method-details h4 {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.method-details a, 
.method-details span {
    font-size: 1.05rem;
    color: var(--text-primary);
    font-weight: 500;
}

.method-details a:hover {
    color: var(--accent-primary);
}

/* Form Styles */
.contact-form-wrapper {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 40px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.submit-btn {
    width: 100%;
    margin-top: 10px;
}

.form-status {
    margin-top: 20px;
    padding: 15px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    display: none;
    align-items: center;
    gap: 10px;
}

.form-status.success {
    display: flex;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--accent-secondary);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.form-status.error {
    display: flex;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444; /* Red */
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    padding: 60px 0 30px;
    background-color: var(--bg-main);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-logo {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    margin-bottom: 24px;
}

.footer-logo span {
    color: var(--accent-primary);
}

.footer-socials {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.footer-socials a {
    color: var(--text-secondary);
    font-size: 1.5rem;
}

.footer-socials a:hover {
    color: var(--text-primary);
    transform: translateY(-3px);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ==========================================================================
   Animations (Reveal)
   ========================================================================== */
.reveal-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal-up.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media screen and (max-width: 992px) {
    .about-card, .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 768px) {
    .hamburger {
        display: block;
        z-index: 1001;
    }

    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .nav-links {
        position: fixed;
        right: -100%;
        top: 0;
        flex-direction: column;
        background-color: var(--bg-main);
        width: 100%;
        height: 100vh;
        align-items: center;
        justify-content: center;
        transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
        border-left: 1px solid var(--border-color);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li a {
        font-size: 1.25rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .title-line {
        width: 100%;
    }
}