:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #f59e0b;
    --dark: #111827;
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

body {
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.5;
}

.container {
    max-width: 1180px;
}

/* NAV */
.app-nav,
nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
    margin-bottom: 22px !important;
    box-shadow: 0 4px 14px rgba(0,0,0,0.04);
}

.app-nav .btn,
nav .btn {
    border-radius: 12px;
    font-weight: 600;
    padding: 8px 12px;
}

/* HEADINGS */
h1, h2, h3, h4, h5 {
    font-weight: 750;
    letter-spacing: -0.02em;
}

h3 {
    margin-bottom: 18px;
}

/* CARDS */
.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 6px 20px rgba(0,0,0,0.04);
    overflow: hidden;
}

.card-header {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    font-weight: 700;
    padding: 14px 18px;
}

.card-body {
    padding: 18px;
}

/* FORMS */
.form-control,
.form-select {
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 10px 12px;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.form-label {
    font-weight: 650;
    color: #374151;
}

/* BUTTONS */
.btn {
    border-radius: 12px;
    font-weight: 650;
}

.btn-sm {
    padding: 7px 10px;
}

/* TABLES */
.table {
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
}

.table th {
    background: #f9fafb;
    color: #374151;
    font-weight: 700;
}

.table td,
.table th {
    vertical-align: middle;
}

/* ALERTS */
.alert {
    border-radius: 14px;
    border: 1px solid var(--border);
}

/* DASHBOARD */
.dashboard-card {
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: #fff;
    box-shadow: 0 6px 20px rgba(0,0,0,0.04);
}

.dashboard-card small {
    color: var(--muted);
    font-weight: 650;
}

.dashboard-card h3 {
    margin: 0;
    font-weight: 800;
}

/* CALENDAR */
.calendar-grid {
    gap: 10px;
}

.day-card {
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

/* MOBILE */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }

    .container {
        padding-left: 10px;
        padding-right: 10px;
    }

    h3 {
        font-size: 20px;
    }

    .desktop-label {
        display: none;
    }

    .app-nav,
    nav {
        gap: 6px;
        padding: 8px;
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .app-nav .btn,
    nav .btn {
        flex: 1 1 22%;
        font-size: 15px;
        padding: 9px 6px;
    }

    .card-body {
        padding: 14px;
    }

    .form-control,
    .form-select {
        font-size: 14px;
        padding: 10px;
    }

    .table-responsive {
        border-radius: 14px;
    }

    .day-card {
        min-height: 86px !important;
        padding: 6px !important;
        font-size: 11px;
    }
}