:root {
    --bg-gradient-start: #eef2f9;
    --bg-gradient-end: #e2e8f2;
    --card-bg: white;
    --text-primary: #1a2c3e;
    --text-secondary: #5e7c9c;
    --border-light: #eff3f9;
    --list-hover: #f8fafd;
    --header-bg: rgba(255,255,255,0.75);
    --shadow: 0 12px 30px -8px rgba(0,0,0,0.05);
    --button-bg: #1e3a5f;
    --button-hover: #0f2c48;
    --accent: #2a7f6e;
    --delete-color: #b91c1c;
    --sidebar-bg: #ffffff;
    --sidebar-hover: #f1f5f9;
    --sidebar-active: #e6f0fa;
}
body.dark {
    --bg-gradient-start: #0f1729;
    --bg-gradient-end: #0a0f1c;
    --card-bg: #1e293b;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-light: #334155;
    --list-hover: #2d3a4e;
    --header-bg: rgba(30,41,59,0.85);
    --shadow: 0 12px 30px -8px rgba(0,0,0,0.3);
    --button-bg: #3b82f6;
    --button-hover: #2563eb;
    --accent: #34d399;
    --delete-color: #f87171;
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
    --sidebar-active: #2d3a4e;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background: linear-gradient(145deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s, color 0.2s;
}
body, button, input, select, textarea, .list-item, .total-row, .transaction-row, .data-table td {
    font-size: 0.9rem;
}
h1, h2, h3, .stat-amount, .section-header, .transactions-header h3 {
    font-size: 1.2rem;
}
.logo h2, .sidebar-header h2 {
    font-size: 1.4rem;
}
.app-wrapper { display: flex; min-height: 100vh; }
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}
.sidebar-header {
    padding: 28px 24px;
    border-bottom: 1px solid var(--border-light);
}
.sidebar-header h2 {
    background: linear-gradient(135deg, #1e3a5f, #2a7f6e);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
}
body.dark .sidebar-header h2 {
    background: linear-gradient(135deg, #60a5fa, #34d399);
    -webkit-background-clip: text;
    background-clip: text;
}
.sidebar-header p { font-size: 0.75rem; color: var(--text-secondary); margin-top: 4px; }
.nav-tabs { flex: 1; padding: 24px 16px; display: flex; flex-direction: column; gap: 8px; }
.tab-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
}
.tab-btn i { width: 24px; color: var(--text-secondary); }
.tab-btn:hover { background: var(--sidebar-hover); }
.tab-btn.active { background: var(--sidebar-active); color: var(--accent); }
.tab-btn.active i { color: var(--accent); }
.main-content { flex: 1; padding: 24px 32px; overflow-x: auto; }
.dashboard { max-width: 1400px; margin: 0 auto; }
.tab-panel { display: none; animation: fadeIn 0.3s ease; }
.tab-panel.active-panel { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 28px;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    padding: 12px 20px;
    border-radius: 60px;
}
.filter-control {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--card-bg);
    padding: 4px 12px 4px 20px;
    border-radius: 50px;
    flex-wrap: wrap;
}
.filter-control select, .dark-toggle, input[type="date"] {
    border: 1px solid var(--border-light);
    padding: 6px 12px;
    border-radius: 40px;
    font-weight: 500;
    font-size: 0.8rem;
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
}
.dark-toggle, .sync-btn, .edit-table-btn, .add-expense-btn, .add-buttons button {
    background: var(--button-bg);
    border: none;
    color: white;
    padding: 6px 16px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: 0.2s;
}
.dark-toggle:hover, .sync-btn:hover, .edit-table-btn:hover { background: var(--button-hover); }
.stats-grid, .tuition-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}
.stats-card {
    background: var(--card-bg);
    border-radius: 28px;
    padding: 18px 22px;
    box-shadow: var(--shadow);
}
.stat-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.stat-amount { font-size: 1.8rem; font-weight: 800; margin-bottom: 4px; }
.stat-sub { font-size: 0.75rem; color: var(--text-secondary); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 28px; }
.two-col .section {
    align-self: start;
}
.section {
    background: var(--card-bg);
    border-radius: 28px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.section-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}
#incomeList, #commitmentsList {
    display: block;
    width: 100%;
    background: var(--card-bg);
    min-height: 0;
}
.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-light);
    background: var(--card-bg);
    width: 100%;
}
.status-check {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
    flex-shrink: 0;
}
.status-check input { transform: scale(1); accent-color: var(--accent); cursor: pointer; }
.total-row {
    padding: 14px 20px;
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    font-weight: 700;
}
.manual-badge {
    background: var(--accent);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 20px;
    margin-left: 8px;
}
.transactions-card {
    background: var(--card-bg);
    border-radius: 28px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.transactions-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}
.transaction-row {
    display: grid;
    grid-template-columns: 1fr 2fr 1.2fr 1fr 0.4fr;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-light);
    align-items: center;
    font-size: 0.85rem;
}
.transaction-header {
    background: rgba(0,0,0,0.02);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
}
.fund-badge {
    background: rgba(0,0,0,0.05);
    border-radius: 30px;
    padding: 2px 10px;
    font-size: 0.7rem;
    font-weight: 600;
    width: fit-content;
}
.delete-expense {
    color: var(--delete-color);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    opacity: 0.6;
}
.empty-message { padding: 30px; text-align: center; color: var(--text-secondary); font-style: italic; }
.data-table-container {
    background: var(--card-bg);
    border-radius: 28px;
    overflow-x: auto;
    box-shadow: var(--shadow);
    margin-top: 20px;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
.data-table th, .data-table td {
    padding: 12px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}
.data-table th {
    background: rgba(0,0,0,0.02);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
}
.status-badge {
    cursor: pointer;
    display: inline-block;
    padding: 4px 12px;
    border-radius: 40px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(0,0,0,0.05);
}
.status-badge.completed { background: #10b98120; color: #10b981; }
.status-badge.postponed { background: #f59e0b20; color: #f59e0b; }
.status-badge.cancelled { background: #ef444420; color: #ef4444; }
.status-badge.pending { background: #6b728020; color: #6b7280; }
.edit-row-btn {
    background: var(--button-bg);
    border: none;
    color: white;
    padding: 4px 10px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.7rem;
}
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(6px);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-content {
    background: var(--card-bg);
    max-width: 500px;
    width: 90%;
    border-radius: 36px;
    padding: 24px;
    max-height: 80vh;
    overflow-y: auto;
}
.modal-content input, .modal-content select {
    width: 100%;
    padding: 10px 14px;
    margin: 8px 0;
    border: 1px solid var(--border-light);
    border-radius: 30px;
    background: var(--card-bg);
    color: var(--text-primary);
}
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 20px;
}
.modal-actions button {
    padding: 8px 20px;
    border-radius: 40px;
    border: none;
    font-weight: 600;
    cursor: pointer;
}
.filter-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-right: -4px;
}
.tuition-filters {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}
.tuition-filters .filter-label {
    margin-left: 8px;
}
.tuition-filters .filter-label:first-child {
    margin-left: 0;
}
@media (max-width: 700px) {
    .list-item {
        flex-wrap: wrap;
        gap: 8px;
    }
    .status-check {
        margin-left: 0;
        width: 100%;
        justify-content: flex-end;
    }
}
@media (max-width: 900px) {
    .app-wrapper { flex-direction: column; }
    .sidebar {
        width: 100%;
        flex-direction: row;
        align-items: center;
        padding: 12px 20px;
        gap: 20px;
        border-bottom: 1px solid var(--border-light);
    }
    .sidebar-header { padding: 0; border-bottom: none; }
    .nav-tabs { flex-direction: row; padding: 0; gap: 8px; justify-content: flex-start; }
    .tab-btn { padding: 8px 16px; gap: 0; }
    .tab-btn .tab-text { display: none; }
    .tab-btn i { margin: 0; font-size: 1.3rem; }
    .main-content { padding: 16px; }
    .two-col { grid-template-columns: 1fr; gap: 16px; }
    .transaction-row {
        grid-template-columns: 0.9fr 1.3fr 0.9fr 0.8fr 0.3fr;
        gap: 6px;
        font-size: 0.7rem;
        padding: 8px 12px;
    }
    .stats-grid, .tuition-stats { gap: 12px; }
    .stats-card { padding: 12px 16px; }
    .stat-amount { font-size: 1.4rem; }
    .data-table th, .data-table td { padding: 8px 6px; font-size: 0.7rem; }
    .header-controls { flex-direction: column; align-items: stretch; }
    .tuition-header { flex-direction: column; }
    .tuition-filters { justify-content: center; }
    .modal-content { width: 95%; padding: 16px; }
}
@media (max-width: 480px) {
    .data-table th, .data-table td { padding: 6px 4px; font-size: 0.65rem; }
}