/* --- CẤU HÌNH MÀU SẮC (CSS VARIABLES) --- */
:root {
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --border: #e5e7eb;
    --primary: #2563eb;
    --input-bg: #ffffff;
    --shadow: rgba(0,0,0,0.05);
    --income: #16a34a;
    --expense: #dc2626;
}

/* Chế độ Dark Mode */
[data-theme="dark"] {
    --bg: #111827;
    --card: #1f2937;
    --text: #f9fafb;
    --border: #374151;
    --primary: #60a5fa;
    --input-bg: #374151;
    --shadow: rgba(0,0,0,0.5);
}

body { font-family: 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); padding: 20px; margin: 0; transition: background 0.3s, color 0.3s; }
.container { max-width: 1000px; margin: 0 auto; }

/* Header */
.header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.header-actions { display: flex; gap: 10px; }
.btn-icon, .theme-toggle { background: var(--card); border: 1px solid var(--border); color: var(--text); padding: 8px 12px; border-radius: 6px; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.btn-icon:hover { background: var(--border); }

/* Dashboard - Hiệu ứng ẩn hiện */
.dashboard { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
    gap: 15px; 
    margin-bottom: 20px; 
    opacity: 1;
    max-height: 500px;
    overflow: hidden;
    transition: all 0.5s ease-in-out;
}
.dashboard.hidden {
    opacity: 0;
    max-height: 0;
    margin-bottom: 0;
    pointer-events: none; /* Không cho click khi ẩn */
}

.card { background: var(--card); padding: 20px; border-radius: 10px; box-shadow: 0 4px 6px var(--shadow); text-align: center; border: 1px solid var(--border); }
.card h3 { margin: 0 0 10px 0; font-size: 14px; opacity: 0.8; }
.card .money { font-size: 24px; font-weight: bold; }
.income { color: var(--income); } 
.expense { color: var(--expense); }

/* Form */
.input-group { background: var(--card); padding: 20px; border-radius: 10px; display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; align-items: end; border: 1px solid var(--border); }
.form-control { flex: 1; min-width: 150px; position: relative; }
label { display: block; margin-bottom: 5px; font-size: 12px; font-weight: bold; }
input, select { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 6px; box-sizing: border-box; background: var(--input-bg); color: var(--text); outline: none; transition: border 0.2s; }
input:focus { border-color: var(--primary); }

/* Popup Amount Style */
.amount-popup {
    position: absolute; bottom: 100%; left: 0;
    background: #333; color: #fff; padding: 5px 10px;
    border-radius: 5px; font-size: 14px; font-weight: bold;
    pointer-events: none; opacity: 0; transform: translateY(10px);
    transition: all 0.2s; z-index: 10; white-space: nowrap;
}
.amount-popup.show { opacity: 1; transform: translateY(-5px); }

/* Buttons */
button { padding: 12px 20px; border: none; border-radius: 6px; cursor: pointer; color: white; font-weight: bold; font-size: 14px; }
.btn-add { background: var(--primary); min-width: 120px; }
.btn-add:hover { opacity: 0.9; }
.btn-danger { background: var(--expense); font-size: 12px; padding: 5px 10px;}

/* Table & Filter */
.filter-bar { margin-bottom: 15px; display: flex; gap: 5px; overflow-x: auto; padding-bottom: 5px; }
.filter-btn { background: var(--card); color: var(--text); border: 1px solid var(--border); white-space: nowrap; }
.filter-btn.active { background: var(--primary); color: white; border-color: var(--primary); }

table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 10px; overflow: hidden; border: 1px solid var(--border); }
th, td { padding: 12px 15px; text-align: left; border-bottom: 1px solid var(--border); color: var(--text); }
th { background: rgba(0,0,0,0.02); font-weight: 600; }

/* Utilities */
.utils { margin-top: 30px; text-align: right; border-top: 1px solid var(--border); padding-top: 10px; }
.btn-outline { background: transparent; border: 1px solid var(--text); color: var(--text); margin-left: 5px; }