* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    transition: background-color 0.4s ease, color 0.4s ease;
    scroll-behavior: smooth;
}

:root {
    --bg-color: #FDF8F5;
    --card-bg: #FFFFFF;
    --text-main: #4A3F35;
    --text-muted: #827366;
    --accent: #E07A5F;
    --accent-hover: #C9674D;
    --border-color: rgba(74, 63, 53, 0.1);
    --shadow: 0 10px 30px rgba(224, 122, 95, 0.1);
    --particle-color: rgba(224, 122, 95, 0.2);
}

[data-theme="dark"] {
    --bg-color: #211D1B;
    --card-bg: #2C2624;
    --text-main: #F4EAE6;
    --text-muted: #B3A497;
    --accent: #F29C85;
    --accent-hover: #E07A5F;
    --border-color: rgba(244, 234, 230, 0.05);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --particle-color: rgba(242, 156, 133, 0.15);
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Partiküller (Arka Plan) */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1; /* İçeriklerin arkasında kalacak */
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: var(--particle-color);
    border-radius: 50%;
    animation: floatParticle linear infinite;
}

@keyframes floatParticle {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% { transform: translateY(-10vh) scale(1.5); opacity: 0; }
}

/* Üst Bar (Menü ve Tema Butonları) */
.top-bar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    z-index: 1000;
    pointer-events: none; /* Aradaki boşlukların tıklanabilir olmaması için */
}

.icon-btn {
    pointer-events: all;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, color 0.3s ease;
}

.icon-btn:hover {
    transform: scale(1.1);
    color: var(--accent);
}

/* Yan Menü (Sidebar) */
.sidebar {
    position: fixed;
    top: 0;
    left: -300px;
    width: 280px;
    height: 100vh;
    background: var(--card-bg);
    z-index: 2000;
    box-shadow: var(--shadow);
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    padding: 80px 30px 30px;
}

.sidebar.open {
    left: 0;
}

.close-btn {
    position: absolute;
    top: 25px;
    right: 25px;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-main);
    cursor: pointer;
    transition: color 0.3s;
}

.close-btn:hover { color: var(--accent); }

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.nav-link {
    text-decoration: none;
    font-size: 1.1rem;
    color: var(--text-main);
    font-weight: 500;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    transition: color 0.3s, padding-left 0.3s;
}

.nav-link:hover {
    color: var(--accent);
    padding-left: 10px;
}

.btn-back-intro {
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    color: var(--accent) !important;
    font-weight: 600;
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Karartma (Overlay) */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1500;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* EKRANLAR */
.screen {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: opacity 0.6s ease, transform 0.6s ease;
    z-index: 10;
}

/* Intro Ekranı */
#intro-screen {
    position: absolute;
    top: 0; left: 0;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
}

#intro-screen.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-30px);
}

.intro-content h1 {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-main), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro-motto {
    font-size: 1.3rem;
    font-style: italic;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 3rem;
}

.enter-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 16px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 auto;
    box-shadow: 0 10px 25px rgba(224, 122, 95, 0.4);
    transition: all 0.3s ease;
}

.enter-btn:hover {
    transform: translateY(-3px) scale(1.05);
    background: var(--accent-hover);
}

/* Ana Ekran (Kaydırmalı Sayfalar) */
#main-screen {
    opacity: 0;
    pointer-events: none;
    transform: translateY(30px);
}

#main-screen.active {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.main-content {
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 100px 20px 40px;
    width: 100%;
}

.page-section {
    margin-bottom: 100px;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
    color: var(--text-main);
}
.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent);
    margin: 10px auto 0;
    border-radius: 2px;
}

/* Profil Alanı */
.profile-header { text-align: center; margin-bottom: 2.5rem; }
.profile-placeholder {
    width: 100px; height: 100px;
    background: linear-gradient(135deg, var(--accent), #D4A373);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1rem;
    color: white; font-size: 2rem; font-weight: 700;
    box-shadow: var(--shadow);
    border: 4px solid var(--bg-color);
}

.about-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    margin-bottom: 2.5rem;
}

.about-card p { font-size: 1.15rem; margin-bottom: 2rem; }

.basic-info {
    list-style: none; display: flex; flex-direction: column; gap: 15px;
    border-top: 1px solid var(--border-color); padding-top: 20px;
}
.basic-info li { display: flex; align-items: center; gap: 15px; font-size: 1.05rem; }
.basic-info li i { color: var(--accent); font-size: 1.2rem; width: 24px; text-align: center; }

/* Projeler Kartları */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.project-card:hover { transform: translateY(-5px); }

.project-img {
    height: 150px;
    background: var(--bg-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 15px;
}

.project-card h3 { margin-bottom: 10px; }
.project-card p { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 20px; }

/* İletişim & Sosyal Medya */
.contact-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.social-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.social-btn:hover {
    background: var(--text-main);
    color: var(--bg-color);
    transform: translateY(-3px);
}

.contact-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.contact-form h3 { margin-bottom: 20px; color: var(--text-main); }

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-main);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.w-100 { width: 100%; justify-content: center; }

/* Butonlar */
.button-group { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap;}
.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 28px; border-radius: 12px;
    text-decoration: none; font-weight: 600; font-size: 1rem;
    transition: all 0.3s ease;
}
.btn-small {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; border-radius: 8px;
    text-decoration: none; font-weight: 500; font-size: 0.9rem;
    background: var(--bg-color); color: var(--text-main);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}
.btn-small:hover { background: var(--text-main); color: var(--bg-color); }
.primary-btn { background: var(--text-main); color: var(--bg-color); border: none; cursor: pointer;}
.primary-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(0,0,0,0.15); }
.secondary-btn { background: transparent; color: var(--text-main); border: 2px solid var(--text-main); }
.secondary-btn:hover { background: var(--text-main); color: var(--bg-color); transform: translateY(-3px); }

/* Footer */
footer { padding: 2rem 20px 3rem; text-align: center; }
.footer-content { max-width: 650px; margin: 0 auto; opacity: 0.6; transition: opacity 0.3s ease; }
.footer-content:hover { opacity: 1; }
.quote { font-size: 1.1rem; font-style: italic; color: var(--text-muted); line-height: 1.6; margin-bottom: 0.8rem; }
.quote-author { font-size: 0.95rem; color: var(--text-main); font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }

/* Mobil Uyumluluk */
@media (max-width: 768px) {
    .intro-content h1 { font-size: 2.8rem; }
    .about-card { padding: 1.5rem; }
    .button-group { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}