:root {
    --color-green: #52b575; 
    --color-dark-green: #3a8a56;
    --color-text: #777777;
    --color-heading: #333333;
    --font-main: 'Montserrat', sans-serif;
    --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
/* Kesinlikle body veya html'e overflow-x: hidden vermiyoruz, position: sticky'yi BOZAR! */
body { font-family: var(--font-main); color: var(--color-text); line-height: 1.8; background: #000; }
a { text-decoration: none; }
.container { max-width: 1300px; margin: 0 auto; padding: 0 40px; }

/* Header */
.main-header { padding: 25px 0; background: rgba(255,255,255,0.9); backdrop-filter: blur(10px); position: fixed; width: 100%; z-index: 9999; border-bottom: 1px solid rgba(255,255,255,0.2); }
.header-container { display: flex; justify-content: space-between; align-items: center; }
.logo a { font-weight: 700; font-size: 1.2rem; line-height: 1.1; display: block; color: var(--color-green); letter-spacing: 1.5px; }
.main-nav ul { list-style: none; display: flex; gap: 35px; }
.main-nav a { color: #333; font-weight: 600; font-size: 0.95rem; transition: var(--transition); }
.main-nav a:hover, .main-nav a.active { color: var(--color-green); }
.header-actions { display: flex; align-items: center; gap: 20px; }
.lang-switcher a { margin-left: 10px; font-size: 0.85rem; font-weight: 600; color: #888; }
.lang-switcher a.active { color: var(--color-green); }

/* Scrollytelling Section */
.scrolly-section {
    position: relative;
    height: 500vh; /* 5 Ekran boyu scroll alanı */
    background: #000;
}
.sticky-container {
    position: sticky;
    top: 0;
    height: 100vh;
    height: 100dvh; /* Mobil Safari için dinamik viewport */
    width: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.scrolly-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; }
.scrolly-bg video {
    width: 100%; height: 100%; object-fit: cover;
    filter: blur(var(--bg-blur, 0px)) brightness(var(--bg-brightness, 1));
    will-change: filter; 
}
.scrolly-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0, var(--overlay-opacity, 0.4));
    z-index: 2;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    z-index: 10; display: flex; flex-direction: column; align-items: center; gap: 10px;
    opacity: var(--indicator-opacity, 1); color: #fff;
}
.mouse { width: 30px; height: 50px; border: 2px solid #fff; border-radius: 20px; position: relative; }
.mouse::before {
    content: ''; position: absolute; top: 10px; left: 50%; transform: translateX(-50%);
    width: 6px; height: 6px; background: #fff; border-radius: 50%;
    animation: scrollDown 2s infinite;
}
@keyframes scrollDown {
    0% { transform: translate(-50%, 0); opacity: 1; }
    100% { transform: translate(-50%, 20px); opacity: 0; }
}

.scrolly-content { position: relative; z-index: 3; width: 100%; text-align: center; }
.scrolly-step {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%) translateY(var(--step-y, 50px));
    opacity: var(--step-opacity, 0);
    width: 100%; pointer-events: none;
    will-change: transform, opacity;
}
.scrolly-step h2 { color: #fff; font-size: clamp(3rem, 5vw, 5rem); font-weight: 700; letter-spacing: -1px; text-shadow: 0 4px 20px rgba(0,0,0,0.5); }
.scrolly-step .large-text { color: #fff; font-size: clamp(1.2rem, 2vw, 2rem); line-height: 1.6; font-weight: 300; text-shadow: 0 4px 15px rgba(0,0,0,0.6); max-width: 900px; margin: 0 auto; }
.section-label { color: var(--color-green); font-weight: 700; letter-spacing: 4px; font-size: 1.2rem; margin-bottom: 20px; text-transform: uppercase; }

.experience-badge-large {
    display: inline-flex; align-items: center; justify-content: center; gap: 20px;
    background: rgba(255,255,255,0.1); backdrop-filter: blur(20px);
    border: 2px solid var(--color-green); padding: 50px 70px; border-radius: 40px;
    color: white; box-shadow: 0 20px 50px rgba(0,0,0,0.2);
}
.experience-badge-large .number { font-size: 7rem; font-weight: 700; color: var(--color-green); line-height: 1; }
.experience-badge-large .text { font-size: 2rem; font-weight: 600; text-align: left; line-height: 1.2; }

footer { text-align: center; padding: 40px 0; background: #111; color: #666; border-top: 1px solid #222; }

/* Hamburger Menu & Mobile Adjustments */
.hamburger { display: none; cursor: pointer; flex-direction: column; gap: 6px; z-index: 10000; }
.hamburger span { width: 32px; height: 3px; background-color: var(--color-green); transition: all 0.3s; border-radius: 3px; }
.mobile-only { display: none; }
.desktop-only { display: flex; }

@media (max-width: 992px) {
    .hamburger { display: flex; }
    .desktop-only { display: none; }
    .mobile-only { display: flex; margin-top: 40px; justify-content: center; }
    
    .main-nav {
        position: fixed; top: 0; right: -100%; width: 85%; max-width: 400px; height: 100vh;
        background: #fff; padding: 120px 40px 40px;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1); z-index: 9999;
        display: flex; flex-direction: column;
    }
    .main-nav.open { right: 0; }
    .main-nav ul { flex-direction: column; gap: 25px; }
    .main-nav a { font-size: 1.3rem; color: #333; }
    
    .hamburger.active span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }
    
    .scrolly-content { padding: 0 15px; width: 100%; box-sizing: border-box; }
    .scrolly-step { padding: 0 15px; box-sizing: border-box; }
    .scrolly-step h2 { font-size: 1.8rem !important; word-wrap: break-word; overflow-wrap: break-word; }
    .scrolly-step .large-text { font-size: 1.1rem !important; word-wrap: break-word; overflow-wrap: break-word; }
    
    .experience-badge-large { padding: 25px 20px !important; width: 100%; max-width: 300px; margin: 0 auto; box-sizing: border-box; flex-direction: column; gap: 5px; }
    .experience-badge-large .number { font-size: 3.5rem !important; }
    .experience-badge-large .text { font-size: 1.1rem !important; text-align: center; }
}

/* Semantic Sections & SEO Utils */
.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

.semantic-section { padding: 100px 0; background: #fff; }
.bg-light { background: #fcfcfc; }
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }

.section-header { margin-bottom: 60px; }
.section-header h2 { font-size: 2.5rem; color: var(--color-green); font-weight: 700; margin-bottom: 20px; }
.divider { width: 60px; height: 4px; background: var(--color-green); margin: 0 auto 20px; border-radius: 2px; }
.divider.left { margin: 0 0 20px 0; }
.subtitle { font-size: 1.1rem; color: #777; max-width: 700px; margin: 0 auto; line-height: 1.8; }

.showcase-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-top: 40px; }
.showcase-card {
    background: #fff; padding: 50px 30px; border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05); border: 1px solid #eee;
    transition: var(--transition); display: flex; flex-direction: column; align-items: center;
}
.showcase-card:hover { transform: translateY(-10px); box-shadow: 0 20px 40px rgba(0,0,0,0.1); border-color: var(--color-green); }
.showcase-card .icon { font-size: 3rem; margin-bottom: 20px; }
.showcase-card h3 { font-size: 1.3rem; color: #333; margin-bottom: 30px; font-weight: 600; text-align: center; }
.btn-outline {
    background: transparent; color: var(--color-green); border: 2px solid var(--color-green);
    padding: 12px 30px; border-radius: 6px; font-weight: 600; transition: var(--transition);
}
.btn-outline:hover { background: var(--color-green); color: #fff; }

.book-container { display: flex; align-items: center; gap: 60px; }
.book-content { flex: 1; }
.book-content h2 { font-size: 2.5rem; color: var(--color-green); font-weight: 700; margin-bottom: 20px; }
.book-content p { font-size: 1.1rem; color: #666; margin-bottom: 30px; line-height: 1.8; }
.book-image { flex: 1; display: flex; justify-content: center; }
.book-placeholder { font-size: 10rem; filter: drop-shadow(0 20px 30px rgba(0,0,0,0.15)); }

@media (max-width: 992px) {
    .book-container { flex-direction: column; text-align: center; }
    .divider.left { margin: 0 auto 20px; }
    .section-header h2, .book-content h2 { font-size: 2rem; }
}

/* Language Flags */

/* Rich Text Content for SEO */
.text-rich-content { max-width: 850px; margin: 0 auto; text-align: left; padding: 20px; }
.text-rich-content p { font-size: 1.15rem; color: #555; margin-bottom: 30px; line-height: 1.9; font-weight: 400; text-align: justify; }

/* Language Flags (Above Text) */
.lang-switcher a { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; margin: 0 8px; font-size: 0.75rem; color: #888; font-weight: 600; }
.lang-switcher a.active { color: var(--color-green); }
.flag { font-size: 1.3rem; margin-right: 0; margin-bottom: 2px; line-height: 1; }

@media (max-width: 992px) {
    .showcase-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
}
@media (max-width: 576px) {
    .showcase-grid { grid-template-columns: 1fr; }
}