/* BizCalc Design System — Premium Dark Theme */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(255,255,255,0.03);
    --bg-card-hover: rgba(255,255,255,0.06);
    --bg-input: rgba(255,255,255,0.05);
    --border-color: rgba(255,255,255,0.08);
    --border-focus: #6366f1;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #10b981;
    --success-bg: rgba(16,185,129,0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239,68,68,0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245,158,11,0.1);
    --sidebar-width: 260px;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --transition: all 0.2s ease;
}

* { margin:0; padding:0; box-sizing:border-box; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-hover); }

/* Layout */
.app-layout { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: 0; left: 0; bottom: 0;
    display: flex; flex-direction: column;
    z-index: 50;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.sidebar-logo span {
    font-weight: 400;
    -webkit-text-fill-color: #a78bfa;
}

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }

.nav-section { margin-bottom: 24px; }
.nav-section-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    padding: 0 12px;
    margin-bottom: 8px;
}

.nav-link {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem; font-weight: 500;
    transition: var(--transition);
    margin-bottom: 2px;
}
.nav-link:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.nav-link.active {
    background: rgba(99,102,241,0.12);
    color: var(--accent);
}
.nav-link svg { width: 20px; height: 20px; flex-shrink: 0; }

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
}

.user-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.85rem; color: #fff;
}

.user-details { flex: 1; min-width: 0; }
.user-name { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-role { font-size: 0.7rem; color: var(--text-muted); text-transform: capitalize; }

/* Main content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 32px;
    min-height: 100vh;
}

.page-header {
    margin-bottom: 32px;
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 16px;
}

.page-title {
    font-size: 1.75rem; font-weight: 700;
    letter-spacing: -0.5px;
}

.page-subtitle { color: var(--text-secondary); font-size: 0.9rem; margin-top: 4px; }

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.card:hover { border-color: rgba(255,255,255,0.12); }
.card-header { margin-bottom: 20px; display: flex; align-items: center; justify-content: space-between; }
.card-title { font-size: 1rem; font-weight: 600; color: var(--text-primary); }
.card-subtitle { font-size: 0.8rem; color: var(--text-muted); }

/* Stat Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.stat-card:hover { transform: translateY(-2px); border-color: rgba(255,255,255,0.15); box-shadow: var(--shadow); }

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--stat-accent, var(--accent));
}

.stat-label { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.stat-value { font-size: 1.75rem; font-weight: 700; letter-spacing: -1px; }
.stat-value.positive { color: var(--success); }
.stat-value.negative { color: var(--danger); }
.stat-change { font-size: 0.8rem; margin-top: 8px; color: var(--text-muted); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-family: inherit; font-size: 0.875rem; font-weight: 600;
    border: none; cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99,102,241,0.3); }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #0ea572; color: #fff; }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }

.btn-secondary { background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--bg-card-hover); }

.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-icon { padding: 8px; width: 36px; height: 36px; justify-content: center; }
.btn-icon svg { width: 16px; height: 16px; }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 8px; }

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit; font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.form-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }
.form-select option { background: var(--bg-secondary); color: var(--text-primary); }

.form-textarea { min-height: 100px; resize: vertical; }
.form-error { color: var(--danger); font-size: 0.8rem; margin-top: 4px; }

.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }

.form-check { display: flex; align-items: center; gap: 10px; cursor: pointer; }
.form-check input[type="checkbox"] {
    width: 18px; height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    padding: 14px 16px;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: 14px 16px;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--bg-card-hover); }

/* Badges */
.badge {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-expense { background: var(--danger-bg); color: var(--danger); }
.badge-revenue { background: var(--success-bg); color: var(--success); }
.badge-active { background: var(--success-bg); color: var(--success); }
.badge-inactive { background: rgba(100,116,139,0.15); color: var(--text-muted); }

/* Amount display */
.amount { font-weight: 600; font-variant-numeric: tabular-nums; }
.amount-expense { color: var(--danger); }
.amount-revenue { color: var(--success); }
.amount-profit { color: var(--success); }
.amount-loss { color: var(--danger); }

/* Charts */
.charts-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 24px; margin-bottom: 32px; }
.chart-container { position: relative; height: 300px; }

/* Filters bar */
.filters-bar {
    display: flex; flex-wrap: wrap; gap: 12px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 24px;
    align-items: flex-end;
}

.filter-group { flex: 1; min-width: 150px; }
.filter-group label { display: block; font-size: 0.75rem; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
.filter-group .form-input,
.filter-group .form-select { padding: 8px 12px; font-size: 0.85rem; }

/* Alerts */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    display: flex; align-items: center; gap: 10px;
    animation: slideDown 0.3s ease;
}

.alert-success { background: var(--success-bg); color: var(--success); border: 1px solid rgba(16,185,129,0.2); }
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); }

/* Pagination */
.pagination { display: flex; gap: 4px; margin-top: 20px; justify-content: center; flex-wrap: wrap; }
.pagination a, .pagination span {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: var(--transition);
}
.pagination a:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.pagination .active span { background: var(--accent); color: #fff; border-color: var(--accent); }
.pagination .disabled span { opacity: 0.3; cursor: not-allowed; }

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state svg { width: 64px; height: 64px; margin-bottom: 16px; opacity: 0.3; }
.empty-state h3 { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 8px; }
.empty-state p { font-size: 0.9rem; margin-bottom: 20px; }

/* Color dot */
.color-dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; flex-shrink: 0; }

/* Category list */
.category-item {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}
.category-item:last-child { border-bottom: none; }

/* Animations */
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.animate-fade { animation: fadeIn 0.4s ease; }

/* Mobile sidebar toggle */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 16px; left: 16px;
    z-index: 60;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px;
    color: var(--text-primary);
    cursor: pointer;
}
.sidebar-toggle svg { width: 24px; height: 24px; }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 40;
}

/* Summary row */
.summary-row {
    display: flex; gap: 24px; flex-wrap: wrap;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 24px;
}
.summary-item { display: flex; flex-direction: column; gap: 2px; }
.summary-item-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; font-weight: 600; }
.summary-item-value { font-size: 1.1rem; font-weight: 700; }

/* Guest layout (auth pages) */
.guest-layout {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-primary);
    padding: 20px;
}

.auth-card {
    width: 100%; max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
    backdrop-filter: blur(10px);
}

.auth-card .sidebar-logo { text-align: center; display: block; margin-bottom: 32px; font-size: 1.8rem; }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-toggle { display: block; }
    .sidebar-overlay.open { display: block; }
    .main-content { margin-left: 0; padding: 20px; padding-top: 60px; }
    .stats-grid { grid-template-columns: 1fr; }
    .charts-grid { grid-template-columns: 1fr; }
    .filters-bar { flex-direction: column; }
    .filter-group { min-width: 100%; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .form-row { grid-template-columns: 1fr; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* Category grid */
.categories-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }

/* Project grid */
.project-card .stat-row {
    display: flex; justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
}
.project-card .stat-row:last-child { border-bottom: none; }
.project-card .stat-row-label { color: var(--text-muted); }