:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #059669;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    line-height: 1.6;
}

/* Navigasyon ve Dropdown Menü */
nav {
    background: var(--card);
    padding: 0 1rem;
    display: flex;
    justify-content: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 60px;
    align-items: center;
}

nav a, .nav-label {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
    display: inline-block;
}

nav a:hover, .dropdown:hover .nav-label {
    background-color: #eff6ff;
    color: var(--primary);
}

/* Dropdown Yapısı */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--card);
    min-width: 180px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border);
    border-radius: 8px;
    z-index: 1;
    top: 100%;
    left: 0;
    overflow: hidden;
}

.dropdown-content a {
    color: var(--text);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    font-size: 0.9rem;
    border-radius: 0;
}

.dropdown-content a:hover {
    background-color: #f1f5f9;
    color: var(--primary);
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* İçerik Alanı */
.container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 20px;
}

.page {
    display: none;
    background: var(--card);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    color: var(--text);
    font-size: 1.5rem;
    margin-top: 0;
    border-bottom: 2px solid var(--bg);
    padding-bottom: 10px;
    margin-bottom: 25px;
}

/* Form Elemanları */
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
}

input, select {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background-color: #fff;
    font-size: 1rem;
    transition: all 0.2s;
    box-sizing: border-box;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    font-size: 1rem;
    font-weight: 600;
    transition: background 0.2s;
}

button:hover {
    background: var(--primary-hover);
}

/* Sonuç Listesi */
.result-item {
    background: #f1f5f9;
    padding: 20px;
    margin: 15px 0;
    border-radius: 10px;
    border-left: 5px solid var(--primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-item h4 {
    margin: 0 0 10px 0;
    color: var(--text);
}

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 20px 0;
}