:root {
    --bg-color: #f4f7f9;
    --card-bg: #ffffff;
    --text-color: #333;
    --border-color: #eee;
    --accent-color: #27ae60;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    margin: 0; padding: 20px; transition: 0.3s;
}

.app-container { max-width: 1000px; margin: 0 auto; }

header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
#darkModeToggle { background: var(--card-bg); border: 1px solid var(--border-color); font-size: 20px; cursor: pointer; padding: 8px; border-radius: 12px; }

/* Giriş Ekranı (Login Overlay) */
#loginOverlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(15px);
    z-index: 9999; display: flex; justify-content: center; align-items: center;
}
.login-box {
    background: var(--card-bg); padding: 30px; border-radius: 20px;
    text-align: center; width: 90%; max-width: 320px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.login-box input { width: 100%; padding: 15px; margin-bottom: 15px; text-align: center; font-size: 20px; letter-spacing: 5px; border-radius: 10px; border: 1px solid var(--border-color); background: var(--bg-color); color: var(--text-color); box-sizing: border-box;}
.login-box button { width: 100%; padding: 12px; background: var(--accent-color); color: white; border: none; border-radius: 10px; font-weight: bold; cursor: pointer; }

/* Diğer Bölümler */
.input-section { background: var(--card-bg); padding: 20px; border-radius: 15px; display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 30px; }
.input-group { flex: 1; min-width: 140px; display: flex; flex-direction: column; }
.input-group label { font-size: 11px; font-weight: bold; margin-bottom: 5px; color: #888; }
input { padding: 12px; border: 1px solid var(--border-color); border-radius: 8px; background: var(--card-bg); color: var(--text-color); }
#addBtn { background: var(--accent-color); color: white; border: none; padding: 0 25px; border-radius: 8px; cursor: pointer; font-weight: bold; height: 43px; margin-top: 18px; }

.planner-section { background: rgba(250, 176, 5, 0.1); border: 1px solid #fab005; padding: 20px; border-radius: 15px; margin-bottom: 30px; }
.market-group { background: var(--card-bg); padding: 15px; border-radius: 10px; margin-bottom: 10px; border-left: 4px solid #fab005; }
.market-title { font-weight: bold; display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 14px; }
.market-total { color: var(--accent-color); }

.planned-item { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border-color); }
.planned-item.bought { opacity: 0.4; text-decoration: line-through; }

.categories-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 15px; }
.category-card { background: var(--card-bg); padding: 15px; border-radius: 12px; border-top: 4px solid #3498db; }
.category-card h2 { font-size: 15px; color: #3498db; margin-top: 0; }

.product-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border-color); }
.price-tag { font-weight: bold; color: var(--accent-color); }

.plan-btn { padding: 5px 10px; border-radius: 6px; border: 1px solid #3498db; background: transparent; color: #3498db; cursor: pointer; font-size: 12px; }
.plan-btn.active { background: #e74c3c; color: white; border-color: #e74c3c; }
.delete-btn { background: none; border: none; color: #e74c3c; cursor: pointer; font-size: 18px; }

/* Modal */
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); backdrop-filter: blur(3px); }
.modal-content { background-color: var(--card-bg); margin: 15% auto; padding: 25px; border-radius: 20px; width: 90%; max-width: 350px; text-align: center; }
.modal-buttons { display: flex; gap: 10px; margin-top: 20px; }
.modal-buttons button { flex: 1; padding: 12px; border: none; border-radius: 10px; cursor: pointer; font-weight: bold; }
.cancel-btn { background: #eee; color: #333; }
.confirm-btn { background: #e74c3c; color: white; }
[data-theme="dark"] .cancel-btn { background: #333; color: #eee; }

@media (max-width: 600px) { .input-group { min-width: 100%; } #addBtn { width: 100%; } }