:root {
    --primary-color: #2563eb;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --success-bg: #dcfce7;
    --success-text: #166534;
    --warning-bg: #fef9c3;
    --warning-text: #854d0e;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;
}

body {
    font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-main);
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 { font-size: 1.875rem; font-weight: 700; color: #111827; margin: 0; }
.refresh-hint { font-size: 0.875rem; color: var(--text-secondary); }

.table-container {
    background-color: var(--card-bg);
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

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

.order-table th {
    background-color: #f9fafb;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.order-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
    font-size: 0.95rem;
}

.order-table tr:hover { background-color: #f9fafb; transition: background-color 0.2s; }

.col-id { font-family: monospace; font-weight: 600; color: var(--primary-color); }
.col-customer { font-weight: 500; }
.col-seller { font-weight: 600; color: #4b5563; }

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}
.status-mới { background-color: var(--danger-bg); color: var(--danger-text); }
.status-đang-xử-lý { background-color: var(--warning-bg); color: var(--warning-text); }
.status-hoàn-thành { background-color: var(--success-bg); color: var(--success-text); }
.status-huỷ { background-color: #f3f4f6; color: #4b5563; text-decoration: line-through; }

.link-btn { color: var(--primary-color); text-decoration: none; font-weight: 500; }
.link-btn:hover { text-decoration: underline; }

/* Form Styling */
.status-form { display: flex; gap: 0.5rem; align-items: center; }

/* Seller Input Style */
.seller-input {
    width: 80px;
    padding: 0.4rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

select {
    padding: 0.4rem 2rem 0.4rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: #fff;
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
}

button {
    padding: 0.4rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
}
button:hover { background-color: #1d4ed8; }

.empty-state { text-align: center; padding: 4rem; color: var(--text-secondary); }