:root {
            --primary: #0ea5e9;
            --primary-hover: #0284c7;
            --dark: #1e293b;
            --light: #f8fafc;
            --gray: #64748b;
            --white: #ffffff;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            margin: 0;
            background-color: var(--light);
            color: var(--dark);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* --- ORTAK HEADER --- */
        header {
            background: var(--white);
            padding: 1rem 8%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .logo {
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--primary);
            text-decoration: none;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--gray);
            font-size: 14px;
            font-weight: 600;
            margin-left: 25px;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: var(--primary);
        }

        /* --- LANDING PAGE (HERO) --- */
        .hero {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 60px 8%;
            background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 100%);
        }

        .hero h1 {
            font-size: clamp(2.5rem, 6vw, 4.5rem);
            /* Dinamik boyutlandırma */
            font-weight: 900;
            margin: 0 0 20px 0;
            width: 100%;
            max-width: 1200px;
            line-height: 1.1;
            color: var(--dark);
            letter-spacing: -1px;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--gray);
            max-width: 800px;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        .btn-main {
            padding: 18px 45px;
            background: var(--primary);
            color: var(--white);
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.1rem;
            box-shadow: 0 10px 25px -5px rgba(14, 165, 233, 0.4);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .btn-main:hover {
            transform: translateY(-3px);
            box-shadow: 0 20px 30px -5px rgba(14, 165, 233, 0.5);
            background: var(--primary-hover);
        }

        /* --- PANEL / LOGIN CARDS --- */
        .content-section {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 40px 8%;
        }

        .login-card {
            background: var(--white);
            width: 100%;
            max-width: 400px;
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
            border: 1px solid #e2e8f0;
        }

        .input-group {
            margin-bottom: 20px;
            text-align: left;
        }

        .input-group label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .input-group input {
            width: 100%;
            padding: 12px 15px;
            border-radius: 12px;
            border: 1px solid #cbd5e1;
            box-sizing: border-box;
            font-size: 14px;
        }

        /* --- PANEL GRID --- */
        .panel-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            width: 100%;
            max-width: 1000px;
        }

        .form-btn {
            background: var(--white);
            padding: 45px 30px;
            border-radius: 24px;
            text-decoration: none;
            color: inherit;
            border: 1px solid #e2e8f0;
            transition: all 0.3s;
            text-align: center;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
        }

        .form-btn:hover {
            transform: translateY(-8px);
            border-color: var(--primary);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05);
        }

        .form-btn .icon {
            font-size: 3rem;
            margin-bottom: 20px;
            display: block;
        }

/* Footer Genel Stili */
.footer-custom {
    background-color: #f8f9fa;
    /* Hafif gri arka plan */
    border-top: 1px solid #dee2e6;
    width: 100%;
}

/* Sayfa içeriği azsa footer'ı en alta itmek için 
   body'ye 'd-flex flex-column min-vh-100' sınıflarını eklemelisin */

.footer-custom p {
    font-size: 0.95rem;
    color: #495057;
}

.footer-custom .fw-bold {
    color: #0d6efd;
    /* Site ismini mavi renkle öne çıkarır */
}

/* Hover efekti (İstersen) */
.footer-custom:hover {
    background-color: #f1f3f5;
    transition: background-color 0.3s ease;
}