:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-color: #333333;
    --border-color: #e0e0e0;
    --input-bg: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --overlay-bg: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] {
    --primary-color: #3498db;
    --secondary-color: #ecf0f1;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333;
    --input-bg: #2d2d2d;
    --shadow: 0 4px 6px rgba(0,0,0,0.5);
    --overlay-bg: rgba(18, 18, 18, 0.98);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

/* Giriş Ekranı (Overlay) */
#entryOverlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--overlay-bg);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.entry-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 90%;
    width: 400px;
    border: 1px solid var(--border-color);
}

.btn-entry {
    display: block;
    width: 100%;
    padding: 15px;
    margin: 15px 0;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
    color: white;
}

.btn-entry:active { transform: scale(0.98); }
.btn-fizyo { background: linear-gradient(135deg, #27ae60, #2ecc71); }
.btn-ozel { background: linear-gradient(135deg, #8e44ad, #9b59b6); }

/* Form Yapısı */
.section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.section-title {
    color: var(--primary-color);
    font-weight: 700;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 25px;
}

/* Form Elemanları */
.form-control, .form-select {
    background-color: var(--input-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 8px;
}

.form-control:focus, .form-select:focus {
    background-color: var(--input-bg);
    color: var(--text-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.form-check-input {
    background-color: var(--input-bg);
    border-color: var(--border-color);
}

/* Soru Kutuları */
.question-box, .bg-light {
    background-color: rgba(52, 152, 219, 0.05) !important;
    border-radius: 8px;
}

[data-theme="dark"] .bg-light,
[data-theme="dark"] .question-box {
    background-color: rgba(255, 255, 255, 0.05) !important;
}

[data-theme="dark"] .table-bordered td, 
[data-theme="dark"] .table-bordered th {
    border-color: var(--border-color);
}

/* Dark Mode Butonu */
#darkModeToggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--card-bg);
    border: 2px solid var(--primary-color);
    color: var(--text-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    z-index: 1000;
    font-size: 1.5rem;
    transition: transform 0.3s;
}
#darkModeToggle:hover { transform: rotate(20deg); }

.hidden { display: none !important; }

/* Mobil Uyumluluk */
@media (max-width: 768px) {
    .section { padding: 15px; }
    .scale-header { display: none !important; }
    .scale-row .col-md-6 { margin-bottom: 10px; }
    .scale-row .text-center div { font-size: 0.85rem; margin-bottom: 5px; }
    h1 { font-size: 1.5rem; }
}