/* Clean CSS with custom properties */

:root {
    --primary: #2787f5;
    --primary-hover: #1a6ed8;
    --danger: #e64646;
    --success: #4bb34b;
    --warning: #ffa000;
    --text: #1a1a1a;
    --text-secondary: #656565;
    --text-muted: #99a2ad;
    --bg: #f5f5f5;
    --bg-card: #ffffff;
    --border: #e7e8ec;
    --sidebar-bg: #1e1e2d;
    --sidebar-text: #a2a3b7;
    --sidebar-active: #2787f5;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
}

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

.sidebar {
    width: 220px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.sidebar-header { padding: 20px 16px; border-bottom: 1px solid rgba(255,255,255,0.06); }
.sidebar-logo {
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 1px;
}

.sidebar-nav { flex: 1; padding: 12px 0; }
.nav-label {
    padding: 16px 16px 6px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: rgba(255,255,255,0.3);
}
.nav-section { padding: 0 8px; }
.nav-item {
    display: block;
    padding: 8px 12px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 6px;
    font-size: 13px;
    transition: background 0.15s, color 0.15s;
}
.nav-item:hover { background: rgba(255,255,255,0.06); color: #fff; }
.nav-item.active { background: var(--sidebar-active); color: #fff; }

.sidebar-footer { padding: 12px 8px; border-top: 1px solid rgba(255,255,255,0.06); }

.main-content { margin-left: 220px; flex: 1; min-width: 0; }

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}
.main-header h2 { font-size: 18px; font-weight: 600; }
.user-badge {
    background: var(--bg);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

.content { padding: 24px; }

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}
.kpi-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.kpi-value { font-size: 28px; font-weight: 700; margin: 4px 0; }
.kpi-delta { font-size: 13px; }
.kpi-delta.up { color: var(--success); }
.kpi-delta.down { color: var(--danger); }
.kpi-delta.neutral { color: var(--text-muted); }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 4px; font-weight: 500; font-size: 13px; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    border-color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
    text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-full { width: 100%; }

/* Alerts */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 13px; }
.alert-error { background: #ffeaea; color: var(--danger); border: 1px solid #fcc; }
.alert-success { background: #e8f8e8; color: var(--success); border: 1px solid #beb; }

/* Tables */
.data-table { width: 100%; border-collapse: collapse; background: var(--bg-card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.data-table th, .data-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th { font-size: 12px; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.5px; background: #fafafa; }
.data-table td { font-size: 13px; }
.data-table tr:hover td { background: #f8f9fb; }

/* Empty state */
.empty-state { text-align: center; padding: 48px; color: var(--text-muted); }
.empty-state a { color: var(--primary); }

/* Login page */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--sidebar-bg);
}
.login-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.login-title { font-size: 28px; font-weight: 700; text-align: center; color: var(--primary); }
.login-subtitle { text-align: center; color: var(--text-muted); margin-bottom: 24px; }

/* Charts */
.chart-container { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px; }
.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 24px; }

/* Cards */
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px; }
.card-title { font-size: 14px; font-weight: 600; margin-bottom: 12px; }