:root {
            --bg-dark: #08080e;
            --panel-bg: #12121a;
            --surface: #1a1a24;
            --accent-color: #ff9f43;
            --accent-blue: #00ffcc;
            --accent-purple: #9b59b6;
            --accent-red: #ff4d4d;
            --text-main: #f1f5f9;
            --text-muted: #9ca3af;
            --text-dim: #64748b;
        }

        /* Erişilebilirlik: yüksek kontrast */
        @media (prefers-contrast: more) {
            :root {
                --bg-dark: #000000;
                --panel-bg: #111116;
                --text-main: #ffffff;
                --text-muted: #d1d5db;
            }
        }

        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(24px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes pulse {
            0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(155, 89, 182, 0.35); }
            70% { transform: scale(1.06); box-shadow: 0 0 0 12px rgba(155, 89, 182, 0); }
            100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(155, 89, 182, 0); }
        }

        * { box-sizing: border-box; }

        html { scroll-behavior: smooth; }

        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-main);
            margin: 0;
            padding: 0;
            line-height: 1.65;
            overflow-x: hidden;
            min-height: 100vh;
        }

        /* Özel İmleç */
        .custom-cursor {
            width: 22px;
            height: 22px;
            border: 2.5px solid var(--accent-blue);
            border-radius: 50%;
            position: fixed;
            transform: translate(-50%, -50%);
            pointer-events: none;
            z-index: 99999;
            transition: width 0.25s ease, height 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.06s linear;
            box-shadow: 0 0 12px rgba(0, 255, 204, 0.35);
            mix-blend-mode: screen;
        }
        .custom-cursor.hovered {
            width: 44px;
            height: 44px;
            background-color: rgba(0, 255, 204, 0.08);
            border-color: var(--accent-purple);
            box-shadow: 0 0 22px rgba(155, 89, 182, 0.35);
        }

        /* Dil Seçim Ekranı */
        .lang-overlay {
            position: fixed;
            inset: 0;
            background: rgba(8, 8, 14, 0.92);
            backdrop-filter: blur(14px);
            z-index: 100000;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 24px;
            animation: fadeInUp 0.7s ease-out both;
        }
        .lang-overlay.hidden {
            display: none !important;
            opacity: 0;
            pointer-events: none;
            visibility: hidden;
        }
        .lang-overlay h2 {
            font-size: clamp(1.8rem, 5vw, 3rem);
            margin-bottom: 8px;
            letter-spacing: -1px;
            font-weight: 800;
        }
        .lang-overlay p {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin-bottom: 36px;
            max-width: 520px;
            line-height: 1.6;
        }
        .lang-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .lang-btn {
            background: linear-gradient(135deg, var(--accent-blue) 0%, #009988 100%);
            color: #000;
            padding: 16px 36px;
            border: none;
            border-radius: 12px;
            font-weight: 800;
            font-size: 1.1rem;
            cursor: pointer;
            box-shadow: 0 8px 28px rgba(0, 255, 204, 0.25);
            transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.3s ease;
            letter-spacing: 0.5px;
        }
        .lang-btn:hover {
            transform: translateY(-4px);
            box-shadow: 0 14px 36px rgba(0, 255, 204, 0.35);
        }
        .lang-btn.secondary {
            background: linear-gradient(135deg, var(--accent-purple) 0%, #6b3085 100%);
            color: #fff;
            box-shadow: 0 8px 28px rgba(155, 89, 182, 0.25);
        }
        .lang-btn.secondary:hover {
            box-shadow: 0 14px 36px rgba(155, 89, 182, 0.35);
        }

        /* Navbar */
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 6%;
            background: rgba(18, 18, 26, 0.82);
            backdrop-filter: blur(14px) saturate(120%);
            -webkit-backdrop-filter: blur(14px) saturate(120%);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            animation: fadeInUp 0.6s ease-out both;
        }
        nav .logo {
            font-size: 1.6rem;
            font-weight: 900;
            letter-spacing: 2px;
            color: #fff;
            text-decoration: none;
        }
        nav .logo span { color: var(--accent-color); }
        nav ul {
            display: flex;
            list-style: none;
            gap: 28px;
            margin: 0;
            padding: 0;
            align-items: center;
        }
        nav ul li a {
            color: var(--text-main);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.92rem;
            transition: color 0.25s ease, text-shadow 0.25s ease;
            position: relative;
        }
        nav ul li a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            border-radius: 2px;
            transition: width 0.25s ease, left 0.25s ease;
        }
        nav ul li a:hover { color: var(--accent-color); text-shadow: 0 0 8px rgba(255,159,67,0.3); }
        nav ul li a:hover::after { width: 100%; left: 0; }

        /* Dil Değiştirme Butonu */
        .lang-switch {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.08);
            color: var(--text-main);
            padding: 8px 14px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            transition: background 0.2s ease, border-color 0.2s ease;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .lang-switch:hover {
            background: rgba(255,255,255,0.12);
            border-color: var(--accent-color);
        }

        /* Hero */
        .hero {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 120px 24px 100px;
            background: radial-gradient(circle at 50% 30%, #1a1235 0%, #0e0b1c 45%, var(--bg-dark) 100%);
            animation: fadeInUp 0.9s ease-out both;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: -20%;
            background: radial-gradient(circle at 40% 40%, rgba(0,255,204,0.06) 0%, transparent 50%), radial-gradient(circle at 60% 60%, rgba(155,89,182,0.06) 0%, transparent 50%);
            pointer-events: none;
            animation: pulse 10s ease-in-out infinite alternate;
        }
        /* Yaratıcı animasyonlu parçacık arka planı */
        #particle-canvas {
            position: absolute;
            top: 0; left: 0;
            width: 100%; height: 100%;
            z-index: 1;
            pointer-events: none;
            opacity: 0.6;
        }
        .hero .badge-coop {
            background: linear-gradient(135deg, var(--accent-purple), #7a2a8f);
            color: #fff;
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.82rem;
            font-weight: 800;
            margin-bottom: 22px;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            box-shadow: 0 4px 20px rgba(155,89,182,0.25);
            animation: pulse 2.5s ease-in-out infinite;
        }
        .hero h1 {
            font-size: clamp(2.2rem, 6vw, 4.2rem);
            margin-bottom: 16px;
            font-weight: 900;
            letter-spacing: -3px;
            line-height: 1.1;
            text-wrap: balance;
        }
        .hero p {
            font-size: clamp(1rem, 2vw, 1.15rem);
            color: var(--text-muted);
            max-width: 720px;
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .cta-btn {
            background: linear-gradient(135deg, var(--accent-color), #e08a1e);
            color: #000;
            padding: 16px 40px;
            font-weight: 900;
            font-size: 1.05rem;
            border-radius: 10px;
            text-decoration: none;
            transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
            box-shadow: 0 10px 28px rgba(255,159,67,0.3);
            letter-spacing: 0.5px;
            display: inline-block;
        }
        .cta-btn:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 36px rgba(255,159,67,0.4);
            filter: brightness(1.08);
        }

        /* Konteyner */
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 80px 24px;
        }

        h2.section-title {
            text-align: center;
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            margin-bottom: 56px;
            position: relative;
            font-weight: 900;
            letter-spacing: -1px;
            line-height: 1.2;
        }
        h2.section-title::after {
            content: '';
            display: block;
            width: 72px;
            height: 5px;
            background: linear-gradient(90deg, var(--accent-color), var(--accent-blue));
            margin: 14px auto 0;
            border-radius: 4px;
        }

        /* Özellikler Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: linear-gradient(160deg, var(--panel-bg) 0%, var(--surface) 100%);
            padding: 36px 28px;
            border-radius: 16px;
            border: 1px solid rgba(255,255,255,0.05);
            transition: all 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-color), var(--accent-blue));
            opacity: 0.6;
            transition: opacity 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-8px);
            border-color: rgba(255,255,255,0.12);
            box-shadow: 0 20px 40px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.06);
        }
        .feature-card:hover::before { opacity: 1; }
        .feature-card h3 {
            color: var(--accent-color);
            margin-top: 0;
            font-size: 1.25rem;
            transition: color 0.3s ease;
            font-weight: 800;
            letter-spacing: -0.3px;
        }
        .feature-card p { color: var(--text-muted); margin-bottom: 0; font-size: 0.95rem; }
        .feature-card ul { padding-left: 20px; color: var(--text-muted); font-size: 0.92rem; }
        .feature-card ul li { margin-bottom: 10px; line-height: 1.55; }
        .feature-card ul li b { color: var(--text-main); font-weight: 700; }

        .feature-card.highlight-blue { border-color: rgba(0, 255, 204, 0.12); background: linear-gradient(160deg, #0d1f20 0%, #111b24 100%); }
        .feature-card.highlight-blue:hover { border-color: rgba(0, 255, 204, 0.35); box-shadow: 0 20px 40px rgba(0, 255, 204, 0.08); }
        .feature-card.highlight-blue h3 { color: var(--accent-blue); }
        .feature-card.highlight-blue::before { background: linear-gradient(90deg, var(--accent-blue), #009988); }

        .feature-card.highlight-purple { border-color: rgba(155, 89, 182, 0.12); background: linear-gradient(160deg, #1a1025 0%, #16122a 100%); }
        .feature-card.highlight-purple:hover { border-color: rgba(155, 89, 182, 0.35); box-shadow: 0 20px 40px rgba(155, 89, 182, 0.08); }
        .feature-card.highlight-purple h3 { color: var(--accent-purple); }
        .feature-card.highlight-purple::before { background: linear-gradient(90deg, var(--accent-purple), #7a2a8f); }

        .feature-card.highlight-red { border-color: rgba(255, 77, 77, 0.12); background: linear-gradient(160deg, #1f1010 0%, #181515 100%); }
        .feature-card.highlight-red:hover { border-color: rgba(255, 77, 77, 0.35); box-shadow: 0 20px 40px rgba(255, 77, 77, 0.08); }
        .feature-card.highlight-red h3 { color: var(--accent-red); }
        .feature-card.highlight-red::before { background: linear-gradient(90deg, var(--accent-red), #cc2a2a); }

        /* Seri Sistemi */
        .serial-section {
            background: linear-gradient(160deg, var(--panel-bg) 0%, #0f0f16 100%);
            border-radius: 20px;
            padding: 48px;
            border: 1px solid rgba(255,255,255,0.06);
            margin-top: 60px;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .serial-section:hover {
            border-color: rgba(0, 255, 204, 0.3);
            box-shadow: 0 0 30px rgba(0, 255, 204, 0.06);
        }
        .serial-format {
            background: #060608;
            padding: 20px;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            font-size: 1.4rem;
            color: var(--accent-blue);
            text-align: center;
            letter-spacing: 3px;
            margin: 28px 0;
            border: 1px solid rgba(0,255,204,0.15);
            box-shadow: inset 0 0 12px rgba(0, 255, 204, 0.08);
            word-break: break-word;
        }
        .serial-details {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 16px;
        }
        .detail-box {
            background: var(--surface);
            padding: 20px;
            border-radius: 10px;
            font-size: 0.88rem;
            border: 1px solid rgba(255,255,255,0.05);
            transition: background 0.3s ease, border-color 0.3s ease;
        }
        .detail-box:hover { border-color: rgba(255,255,255,0.12); background: #20202c; }
        .detail-box strong { color: #fff; display: block; margin-bottom: 8px; font-size: 0.95rem; letter-spacing: 0.5px; }
        .detail-box br { line-height: 1.6; }

        /* Özel bilgi kutusu */
        .info-box {
            margin-top: 32px;
            padding: 18px 22px;
            background: rgba(0,255,204,0.04);
            border-left: 4px solid var(--accent-blue);
            border-radius: 0 10px 10px 0;
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.65;
        }
        .info-box strong { color: var(--accent-blue); font-weight: 700; }

        /* Footer */
        footer {
            text-align: center;
            padding: 50px 24px;
            background: linear-gradient(180deg, #06060a 0%, #030305 100%);
            color: var(--text-dim);
            font-size: 0.88rem;
            border-top: 1px solid rgba(255,255,255,0.04);
        }

        /* Yaratıcı animasyonlar */
        @keyframes shimmer {
            0% { background-position: -200% center; }
            100% { background-position: 200% center; }
        }
        .section-title {
            color: var(--text-main);
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 72px;
            height: 5px;
            background: linear-gradient(90deg, var(--accent-color), var(--accent-blue), var(--accent-purple));
            margin: 14px auto 0;
            border-radius: 4px;
            box-shadow: 0 0 12px rgba(0,255,204,0.4);
        }
        .section-title:hover::after {
            animation: pulse 1.5s ease infinite;
        }
        /* Dekoratif geometrik şekiller */
        .geo-shape {
            position: absolute;
            width: 300px; height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0,255,204,0.08) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        .geo-shape.top-left { top: -80px; left: -80px; }
        .geo-shape.bottom-right { bottom: -80px; right: -80px; }

        /* Responsive */
        @media (max-width: 768px) {
            nav { padding: 16px 5%; }
            nav ul { gap: 16px; flex-wrap: wrap; justify-content: flex-end; }
            .hero { padding: 90px 20px 70px; }
            .hero h1 { letter-spacing: -2px; }
            .container { padding: 50px 16px; }
            .serial-section { padding: 28px 20px; }
            .serial-format { font-size: 1rem; letter-spacing: 1px; padding: 14px; }
            .feature-card { padding: 28px 20px; }
        }