:root {
    --primary-color: #0891b2;      /* Koyu Camgöbeği - Daha iyi kontrast için */
    --primary-hover: #0e7490;      /* Daha koyu Camgöbeği */
    --background-color: #f8fafc;  /* Ferah Gri */
    --card-background: #ffffff;      /* Beyaz */
    --text-color: #0f172a;           /* Mavimsi Koyu Gri (Slate) */
    --text-light: #64748b;           /* Orta Gri (Slate) */
    --border-color: #e2e8f0;         /* Açık Gri (Slate) */
    --header-bg: #1e3a8a;            /* Derin Gece Mavisi */
    --header-text: #ffffff;          /* Beyaz */
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Nunito', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.7;
    margin: 0;
    padding: 0;
    min-height: 100vh;
}
.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--primary-hover);
}
h1, h2, h3 { color: var(--text-color); }

/* BUTONLAR */
.button-primary {
    background: var(--primary-color);
    color: #fff !important;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    min-width: 100px;
    transition: background-color 0.2s ease;
}
.button-primary:hover {
    background: var(--primary-hover);
    text-decoration: none;
}

.button-secondary {
    background-color: #f1f5f9; /* Açık Gri */
    color: var(--text-light) !important;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}
.button-secondary:hover {
    background-color: #e2e8f0; /* Koyu Gri */
    color: var(--text-color) !important;
}

.button-secondary.active {
    background-color: var(--primary-color);
    color: #fff !important;
}