:root {
            --bg: #ffffff;
            --bg-secondary: #f8f9fa;
            --bg-card: #ffffff;
            --text: #1a1a1a;
            --text-secondary: #6b7280;
            --text-muted: #9ca3af;
            --border: #e5e7eb;
            --border-hover: #d1d5db;
            --accent: #50C2D4;
            --accent-hover: #3EB0C4;
        }

        [data-theme="dark"] {
            --bg: #0f0f0f;
            --bg-secondary: #171717;
            --bg-card: #1a1a1a;
            --text: #ffffff;
            --text-secondary: #a1a1aa;
            --text-muted: #71717a;
            --border: #27272a;
            --border-hover: #3f3f46;
            --accent: #50C2D4;
            --accent-hover: #3EB0C4;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        html {
            scroll-behavior: smooth;
            overflow-x: clip;
        }

        body {
            font-family: 'Inter', -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            transition: background 0.3s, color 0.3s;
            overflow-x: clip;
            max-width: 100vw;
            /* Header 64px (tema orijinal tasarimi); hero/page-header padding'leri 64px'e gore — ek bosluk yok */
            padding-top: 0;
        }

        a { color: inherit; text-decoration: none; }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== HEADER ========== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background: var(--bg);
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 48px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.1rem;
        }

        .logo-box {
            width: 34px;
            height: 34px;
            background: var(--accent);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            line-height: 1;
        }

        .logo-box span {
            font-size: 0.7rem;
            font-weight: 800;
            color: white;
            letter-spacing: 0.08em;
        }

        .logo-text-img {
            height: 40px;
            width: auto;
            display: block;
        }

        /* Tek SVG logo; koyu temada filtreyle beyazlat */
        .logo .logo-dark { display: none; }
        [data-theme="dark"] .logo .logo-light { display: none; }
        [data-theme="dark"] .logo .logo-dark { display: block; filter: brightness(0) invert(1); }

        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-link {
            padding: 8px 16px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: 0.2s;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--text);
            background: var(--bg-secondary);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .theme-toggle {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            color: var(--text);
            cursor: pointer;
        }

        [data-theme="dark"] .theme-toggle .fa-moon { display: none; }
        [data-theme="light"] .theme-toggle .fa-sun { display: none; }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            font-size: 0.875rem;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: 0.2s;
        }

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

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

        .btn-ghost {
            background: transparent;
            color: var(--text);
            border: 1px solid var(--border);
        }

        .btn-ghost:hover {
            background: var(--bg-secondary);
        }

        /* ========== CTA ========== */
        .cta {
            padding: 48px 0;
            background: #1a1a1a;
            text-align: center;
        }

        [data-theme="dark"] .cta {
            background: #0a0a0a;
        }

        .cta-title {
            font-size: 1.5rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 8px;
            letter-spacing: -0.02em;
        }

        .cta-desc {
            font-size: 1rem;
            color: #a1a1aa;
            margin-bottom: 24px;
        }

        .cta-buttons {
            display: flex;
            gap: 12px;
            justify-content: center;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: 0.2s;
            border: none;
            cursor: pointer;
        }

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

        .cta-btn-primary:hover {
            background: var(--accent-hover);
        }

        .cta-btn-secondary {
            background: transparent;
            color: #ffffff;
            border: 1px solid rgba(255,255,255,0.2);
        }

        .cta-btn-secondary:hover {
            border-color: rgba(255,255,255,0.4);
        }

        /* ========== FOOTER ========== */
        .footer {
            padding: 60px 0 0;
            background: #0f0f0f;
            position: relative;
        }

        [data-theme="light"] .footer {
            background: #1a1a1a;
        }

        .footer-shapes {
            position: absolute;
            inset: 0;
            overflow: hidden;
            pointer-events: none;
        }

        .footer-shape {
            position: absolute;
            border: 1px solid rgba(255,255,255,0.05);
        }

        .footer-shape-1 {
            width: 300px;
            height: 300px;
            top: -100px;
            right: -50px;
        }

        .footer-shape-2 {
            width: 200px;
            height: 200px;
            top: 50%;
            left: -100px;
            transform: rotate(45deg);
        }

        .footer-shape-3 {
            width: 150px;
            height: 150px;
            bottom: 100px;
            right: 20%;
            background: rgba(80,194,212,0.03);
            border-color: rgba(80,194,212,0.1);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
            position: relative;
            z-index: 1;
        }

        .footer-brand .logo-text-img {
            filter: brightness(0) invert(1);
            height: 76px;
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: #a1a1aa;
            margin-top: 16px;
            line-height: 1.8;
        }

        .footer-social {
            display: flex;
            gap: 10px;
            margin-top: 24px;
        }

        .social-link {
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.1);
            color: #a1a1aa;
            font-size: 1rem;
            transition: 0.3s;
        }

        .social-link:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: white;
        }

        .footer-title {
            font-size: 0.85rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #ffffff;
            margin-bottom: 20px;
        }

        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 12px; }

        .footer-links a {
            font-size: 0.9rem;
            color: #a1a1aa;
            transition: 0.2s;
        }

        .footer-links a:hover {
            color: #ffffff;
        }

        .footer-newsletter-section {
            margin-top: 40px;
            position: relative;
            z-index: 1;
        }

        .footer-newsletter {
            background: linear-gradient(135deg, var(--accent) 0%, #2B9AA8 100%);
            padding: 24px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .footer-newsletter-text {
            display: flex;
            align-items: center;
            gap: 16px;
            color: white;
        }

        .footer-newsletter-text i { font-size: 1.5rem; opacity: 0.9; }
        .footer-newsletter-text h4 { font-size: 1rem; font-weight: 700; margin-bottom: 2px; }
        .footer-newsletter-text p { font-size: 0.8rem; opacity: 0.85; }

        .footer-newsletter-form { display: flex; gap: 0; }

        .footer-newsletter-input {
            padding: 12px 16px;
            background: rgba(255,255,255,0.15);
            border: 1px solid rgba(255,255,255,0.2);
            border-right: none;
            font-size: 0.85rem;
            color: white;
            outline: none;
            min-width: 240px;
        }

        .footer-newsletter-input::placeholder { color: rgba(255,255,255,0.7); }

        .footer-newsletter-btn {
            padding: 12px 24px;
            background: white;
            color: var(--accent);
            border: none;
            font-size: 0.85rem;
            font-weight: 700;
            cursor: pointer;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.85rem;
            color: #71717a;
            flex-wrap: wrap;
            gap: 16px;
            position: relative;
            z-index: 1;
        }

        .footer-bottom a {
            color: var(--accent);
        }

        .footer-payments {
            display: flex;
            align-items: center;
        }

        .footer-payments img {
            height: 28px;
            opacity: 0.7;
            transition: 0.3s;
        }

        .footer-payments img:hover {
            opacity: 1;
        }

        .footer-legal {
            display: flex;
            gap: 16px;
        }

        .footer-legal a {
            color: #71717a;
        }

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

        /* ========== HAMBURGER MENU ========== */
        .hamburger {
            display: none;
            width: 40px;
            height: 40px;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            cursor: pointer;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
        }

        .hamburger span {
            width: 18px;
            height: 2px;
            background: var(--text);
            transition: 0.3s;
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* Mobile Nav */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--bg);
            z-index: 99;
            padding: 24px;
            flex-direction: column;
            gap: 8px;
            overflow-y: auto;
        }

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

        .mobile-nav-link {
            display: block;
            padding: 16px;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text);
            border-bottom: 1px solid var(--border);
        }

        .mobile-nav-link:hover,
        .mobile-nav-link.active {
            color: var(--accent);
        }

        .mobile-nav-btn {
            display: block;
            padding: 16px;
            text-align: center;
            background: var(--accent);
            color: white;
            font-weight: 600;
            margin-top: 16px;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .container { padding: 0 16px; }
            .nav { display: none; }
            .hamburger { display: flex; }
            .header-actions .btn { display: none; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-newsletter { flex-direction: column; text-align: center; padding: 20px 16px; }
            .footer-newsletter-form { width: 100%; flex-direction: column; }
            .footer-newsletter-input { flex: 1; min-width: auto; width: 100%; border-right: 1px solid rgba(255,255,255,0.2); }
            .footer-bottom { flex-direction: column; text-align: center; }
            .footer-legal { flex-direction: column; gap: 8px; }
            .cta-buttons { flex-direction: column; }
            .cta-btn { width: 100%; justify-content: center; }
        }