/* --- Global Variables for Scalability --- */
:root {
    --primary-color: #2563eb;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --danger: #ef4444;
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    padding: 20px;
}

/* --- KPI Header (Grid Layout) --- */
.kpi-header {
    display: grid;
    /* Auto-fit creates a responsive grid without media queries! */
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto 30px auto;
}

.kpi-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-top: 4px solid var(--primary-color);
    text-align: center;
}

.kpi-card.alert {
    border-top-color: var(--danger);
}

.kpi-card h3 {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi-card .kpi-value {
    font-size: 2.2rem;
    font-weight: bold;
    margin-top: 10px;
}

.kpi-card.alert .kpi-value {
    color: var(--danger);
}

/* --- Main Dashboard Container --- */
.dashboard-container {
    display: grid;
    grid-template-columns: 2fr 1fr; /* Table takes 2/3 width, Form takes 1/3 */
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.table-section, .form-section {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

/* --- Table Styling --- */
.table-wrapper {
    overflow-x: auto; /* Keeps table from breaking mobile screens */
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 14px 15px;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f9fafb;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* --- Status & Priority Badges (Pills) --- */
.status, .priority {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Status Colors */
.status.in-transit { background-color: #dbeafe; color: #1d4ed8; }
.status.delivered { background-color: #d1fae5; color: #047857; }
.status.delayed { background-color: #fee2e2; color: #b91c1c; }

/* Priority Colors */
.priority.high { background-color: #fee2e2; color: #b91c1c; }
.priority.low { background-color: #f3f4f6; color: #4b5563; }

/* --- Interactive Form Styling --- */
.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
}

input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    outline: none;
}

input:focus, select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.submit-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.submit-btn:hover {
    background-color: #1d4ed8;
}

/* --- JS Message Utility Classes --- */
.hidden {
    display: none;
}

#confirmation-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 6px;
    text-align: center;
    font-weight: 500;
    font-size: 0.9rem;
}

.success-msg {
    background-color: #d1fae5;
    color: #047857;
    border: 1px solid #34d399;
}

/* --- Responsive Design (Mobile) --- */
@media (max-width: 850px) {
    .dashboard-container {
        /* Stack the table and form vertically on smaller screens */
        grid-template-columns: 1fr;
    }
}