/* ============================================================
   WOHLER CHEMICAL LLC — Global Design System
   Touch-first, tablet-optimized, clean industrial aesthetic
   ============================================================ */

/* ── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    /* Brand colors */
    --primary:       #4f46e5;
    --primary-dark:  #3730a3;
    --primary-light: #818cf8;
    --secondary:     #7c3aed;
    --accent:        #f59e0b;
    --success:       #059669;
    --danger:        #dc2626;
    --warning:       #d97706;
    --info:          #0284c7;

    /* Neutral scale */
    --gray-50:  #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Page background — deep blue-gray */
    --page-bg:   #0f172a;
    --page-bg2:  #1e293b;

    /* Card / surface */
    --surface:        #ffffff;
    --surface-raised: #f8fafc;
    --surface-dark:   #1e293b;
    --border:         #e2e8f0;
    --border-dark:    rgba(255,255,255,0.1);

    /* Touch target */
    --touch-min: 48px;

    /* Typography */
    --font:       'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', sans-serif;
    --font-mono:  'Courier New', monospace;

    /* Spacing */
    --space-xs:  4px;
    --space-sm:  8px;
    --space-md:  16px;
    --space-lg:  24px;
    --space-xl:  32px;
    --space-2xl: 48px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm:  0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
    --shadow-md:  0 4px 12px rgba(0,0,0,0.12), 0 2px 6px rgba(0,0,0,0.08);
    --shadow-lg:  0 10px 30px rgba(0,0,0,0.15), 0 4px 12px rgba(0,0,0,0.10);
    --shadow-xl:  0 20px 50px rgba(0,0,0,0.2);
    --shadow-inset: inset 0 2px 4px rgba(0,0,0,0.06);

    /* Header gradient */
    --header-bg: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%);

    /* Transitions */
    --transition: 0.18s ease;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--page-bg);
    color: var(--gray-800);
    min-height: 100vh;
    line-height: 1.5;
}

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

/* ── Page Header / Branding Bar ────────────────────────────── */
.header,
.top-nav,
header {
    background: var(--header-bg);
    color: white;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    position: sticky;
    top: 0;
    z-index: 200;
    box-shadow: 0 2px 12px rgba(0,0,0,0.4);
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.header h1,
.top-nav h1,
header h1 {
    font-size: 20px;
    font-weight: 700;
    color: white;
    letter-spacing: 0.3px;
    white-space: nowrap;
    margin: 0;
    padding: var(--space-sm) 0;
    text-shadow: none;
}

/* ── Navigation ────────────────────────────────────────────── */
nav,
.top-nav-right,
.header nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

nav a,
.top-nav a,
.header nav a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    transition: background var(--transition), color var(--transition);
    min-height: var(--touch-min);
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
    background: transparent;
    border: none;
}

nav a:hover,
.top-nav a:hover,
.header nav a:hover {
    background: rgba(255,255,255,0.15);
    color: white;
    transform: none;
}

nav a.active,
.top-nav a.active,
.header nav a.active {
    background: rgba(255,255,255,0.2);
    color: white;
    font-weight: 600;
}

/* Logout link — right-aligned */
nav a[onclick*="logout"],
.header nav a[onclick*="logout"] {
    margin-left: auto;
    background: rgba(220,38,38,0.25);
    color: #fca5a5;
}
nav a[onclick*="logout"]:hover {
    background: rgba(220,38,38,0.4);
    color: white;
}

/* ── Main Container ────────────────────────────────────────── */
.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--surface);
    min-height: calc(100vh - 64px);
}

/* Page wrapper for pages without .container */
.page-wrapper,
.assignment-container,
.dashboard-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

/* ── Section / Card wrappers ───────────────────────────────── */
.input-section,
.admin-section {
    padding: var(--space-xl) var(--space-lg);
    background: var(--gray-50);
}

.input-section h2,
.admin-section h2 {
    color: var(--primary);
    margin-bottom: var(--space-lg);
    font-size: 22px;
    font-weight: 700;
}

.input-section h3,
.admin-section h3 {
    color: var(--secondary);
    margin: var(--space-xl) 0 var(--space-md) 0;
    font-size: 17px;
    font-weight: 600;
}

/* ── Form Controls ─────────────────────────────────────────── */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--gray-700);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 17px;
    font-family: var(--font);
    color: var(--gray-800);
    background: white;
    transition: border-color var(--transition), box-shadow var(--transition);
    min-height: var(--touch-min);
    -webkit-appearance: none;
    appearance: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748b' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
}

input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

textarea { resize: vertical; min-height: 100px; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn,
button.btn,
.btn-primary,
.btn-success,
.btn-secondary,
.btn-danger,
.btn-warning,
.btn-info {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--transition);
    min-height: var(--touch-min);
    min-width: 44px;
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.2px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(79,70,229,0.3);
    margin: 0;
    padding: 14px 28px;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(79,70,229,0.4);
}

.btn-success {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(5,150,105,0.3);
    margin-left: 0;
}
.btn-success:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(5,150,105,0.4); }

.btn-secondary {
    background: var(--gray-600);
    color: white;
    margin-left: 0;
}
.btn-secondary:hover { background: var(--gray-700); transform: translateY(-2px); }

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #b91c1c 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(220,38,38,0.25);
    padding: 14px 28px;
}
.btn-danger:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(220,38,38,0.35); }

.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, #f59e0b 100%);
    color: white;
    padding: 14px 28px;
}
.btn-warning:hover { transform: translateY(-2px); }

.btn-info {
    background: linear-gradient(135deg, var(--info) 0%, #0ea5e9 100%);
    color: white;
    padding: 14px 28px;
}
.btn-info:hover { transform: translateY(-2px); }

/* Large touch buttons */
.btn-lg {
    padding: 18px 36px;
    font-size: 18px;
    border-radius: var(--radius-lg);
    min-height: 58px;
}

/* Small buttons */
.btn-sm,
.btn-small {
    padding: 8px 14px;
    font-size: 13px;
    min-height: 36px;
    border-radius: var(--radius-sm);
}

button:disabled,
.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.button-group {
    margin-top: var(--space-xl);
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    align-items: center;
}

/* ── Admin Hub Card Grid ────────────────────────────────────── */
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    max-width: 1200px;
    margin: var(--space-xl) auto;
    padding: var(--space-lg);
}

.admin-grid.tight { margin-top: var(--space-md); }

.admin-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl) var(--space-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
    text-align: center;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.admin-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.admin-card-icon {
    font-size: 48px;
    margin-bottom: var(--space-md);
    display: block;
}

.admin-card h2 {
    color: var(--gray-800);
    margin-bottom: var(--space-sm);
    font-size: 20px;
    font-weight: 700;
}

.admin-card p {
    color: var(--gray-500);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
    font-size: 14px;
    flex: 1;
}

.admin-card a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 13px 28px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: opacity var(--transition), transform var(--transition);
    width: 100%;
    min-height: var(--touch-min);
    box-shadow: 0 4px 12px rgba(79,70,229,0.25);
}

.admin-card a:hover { opacity: 0.9; transform: translateY(-1px); }

/* Section headers in admin-hub */
.page-header {
    text-align: center;
    padding: var(--space-xl) var(--space-lg) var(--space-md);
}

.page-header h1 {
    color: white;
    font-size: 32px;
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

.page-header p {
    color: rgba(255,255,255,0.8);
    font-size: 16px;
}

.section-header {
    max-width: 1200px;
    margin: var(--space-lg) auto 0 auto;
    padding: 0 var(--space-lg);
}

.section-header h2 {
    color: white;
    font-size: 16px;
    font-weight: 700;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    display: inline-block;
}

.section-header.smart-batch h2 {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.section-header.admin-section h2 {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.section-header p {
    color: rgba(255,255,255,0.8);
    margin-top: var(--space-xs);
    font-size: 14px;
}

.admin-card.smart-batch-card a {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.admin-card.optimization-card a {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: #1a1a2e;
}

/* ── Batch Cards (batch-assignment) ────────────────────────── */
.batch-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition);
}

.batch-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.batch-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
    gap: var(--space-sm);
}

.batch-num {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-800);
}

.batch-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    flex-wrap: wrap;
}

.action-btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: opacity var(--transition), transform var(--transition);
    min-height: var(--touch-min);
    min-width: 80px;
}

.action-btn:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-execute { background: linear-gradient(135deg, #059669, #10b981); color: white; }
.btn-reassign { background: linear-gradient(135deg, #d97706, #f59e0b); color: white; }
.btn-delete { background: linear-gradient(135deg, var(--danger), #b91c1c); color: white; }

/* ── Status Badges ─────────────────────────────────────────── */
.status-badge,
.batch-status-badge {
    padding: 5px 14px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    display: inline-block;
}

.status-assigned    { background: #dbeafe; color: #1d4ed8; }
.status-in-progress { background: #fef3c7; color: #92400e; }
.status-completed   { background: #d1fae5; color: #065f46; }
.status-archived    { background: var(--gray-100); color: var(--gray-500); }

/* ── Filter Bar ────────────────────────────────────────────── */
.filter-bar {
    background: var(--surface);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    align-items: flex-end;
    border: 1px solid var(--border);
}

.filter-group {
    flex: 1;
    min-width: 140px;
}

.filter-group label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 6px;
}

.filter-group select,
.filter-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    min-height: var(--touch-min);
    background: white;
    -webkit-appearance: none;
    appearance: none;
}

/* ── Stats Grid ────────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-xl) var(--space-lg);
}

.stat-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: var(--space-xl) var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-card h3 {
    font-size: 12px;
    margin-bottom: var(--space-sm);
    opacity: 0.85;
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.stat-card p,
.stat-number {
    font-size: 2.4em;
    font-weight: 800;
    color: white;
}

/* ── Tables ────────────────────────────────────────────────── */
.admin-table,
.history-table,
.procedure-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.admin-table th,
.history-table th {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    position: sticky;
    top: 0;
}

.admin-table td,
.history-table td {
    padding: 14px 16px;
    border: 1px solid var(--border);
    vertical-align: middle;
    color: var(--gray-700);
}

.admin-table tr:nth-child(even),
.history-table tr:nth-child(even) {
    background: var(--gray-50);
}

.admin-table tr:hover,
.history-table tr:hover {
    background: #eff6ff;
}

.table-container {
    padding: var(--space-lg);
    overflow-x: auto;
}

/* ── Procedure Table (batch sheet) ─────────────────────────── */
.procedure-table {
    margin-top: var(--space-lg);
    font-size: 13px;
}

.procedure-table thead { background: var(--gray-800); color: white; }

.procedure-table th {
    padding: 10px 8px;
    font-weight: 600;
    border: 1px solid var(--gray-700);
    color: white;
    background: var(--gray-800);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    position: static;
}

.procedure-table td {
    padding: 9px 8px;
    border: 1px solid var(--border);
    vertical-align: top;
    color: var(--gray-700);
}

.procedure-table tbody tr:nth-child(even) { background: var(--gray-50); }
.procedure-table tbody tr:hover { background: #eff6ff; }

.step-number { font-weight: 700; color: var(--primary); text-align: center; }
.material-name { font-weight: 600; color: var(--gray-800); }
.quantity { text-align: right; font-weight: 700; color: var(--gray-800); }
.instruction { font-size: 12px; color: var(--gray-500); }
.note-section { background: #fffbeb !important; color: #78350f; font-style: italic; }
.checkbox-col { text-align: center; width: 30px; }
.checkbox-col input[type="checkbox"] { width: 20px; height: 20px; cursor: pointer; }

/* ── Batch Sheet Print Header ──────────────────────────────── */
.batch-sheet { padding: var(--space-lg); background: white; }

.print-header {
    border: 3px solid var(--gray-800);
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.print-header h2 {
    text-align: center;
    color: var(--gray-800);
    font-size: 22px;
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.batch-info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    font-size: 14px;
}

.batch-info-grid div {
    padding: 8px 10px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.batch-info-grid strong { color: var(--primary); }

/* ── Info / Formula Boxes ──────────────────────────────────── */
.formula-info,
.info-box {
    background: #eff6ff;
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
}

.formula-info h3,
.info-box h3 { color: var(--primary); margin-bottom: var(--space-md); font-size: 16px; }

.formula-info ul,
.info-box ul { padding-left: var(--space-lg); line-height: 1.9; color: var(--gray-600); }

/* ── Search Section ────────────────────────────────────────── */
.search-section {
    padding: var(--space-xl) var(--space-lg);
    background: var(--gray-50);
    border-bottom: 1px solid var(--border);
}

.search-section h2 { color: var(--primary); margin-bottom: var(--space-lg); font-size: 20px; }

.search-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
}

.search-grid input,
.search-grid select,
.search-grid button {
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    min-height: var(--touch-min);
    font-family: var(--font);
}

.search-grid button {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

/* ── Dropdown Nav (legacy) ─────────────────────────────────── */
.nav-dropdown { position: relative; display: inline-block; }

.nav-dropdown-btn {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    background: transparent;
    transition: background var(--transition);
    cursor: pointer;
    border: none;
    font-size: 14px;
    font-family: var(--font);
    font-weight: 500;
    min-height: var(--touch-min);
    display: inline-flex;
    align-items: center;
}

.nav-dropdown-btn:hover { background: rgba(255,255,255,0.15); color: white; transform: none; }

.nav-dropdown-content {
    display: none;
    position: absolute;
    background: white;
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    border-radius: var(--radius-md);
    margin-top: 4px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.nav-dropdown-content a {
    color: var(--gray-700);
    padding: 13px 18px;
    text-decoration: none;
    display: block;
    background: white;
    transition: background var(--transition);
    font-size: 14px;
    min-height: var(--touch-min);
    display: flex;
    align-items: center;
}

.nav-dropdown-content a:hover { background: var(--gray-50); transform: none; }
.nav-dropdown:hover .nav-dropdown-content { display: block; }
.nav-dropdown:hover .nav-dropdown-btn { background: rgba(255,255,255,0.15); }

/* ── User Info / Logout ────────────────────────────────────── */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255,255,255,0.8);
    font-size: 13px;
}

.logout-btn {
    background: rgba(220,38,38,0.25);
    border: 1px solid rgba(220,38,38,0.4);
    color: #fca5a5;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
    min-height: 36px;
    position: static;
}

.logout-btn:hover { background: rgba(220,38,38,0.4); color: white; }

/* ── Status Badges (inventory) ─────────────────────────────── */
.status-available { color: var(--success); font-weight: 700; }
.status-low       { color: var(--warning); font-weight: 700; }
.status-depleted  { color: var(--danger);  font-weight: 700; }

/* ── Modals ────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 500;
    padding: var(--space-lg);
    backdrop-filter: blur(4px);
}

.modal {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    max-width: 560px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    max-height: 90vh;
    overflow-y: auto;
}

.modal h2 {
    font-size: 22px;
    color: var(--gray-800);
    margin-bottom: var(--space-lg);
    font-weight: 700;
}

/* ── Misc utilities ────────────────────────────────────────── */
.no-print { /* screen only — printed via @media print */ }
.page-break { page-break-before: always; }

.badge-new {
    display: inline-block;
    background: #f5576c;
    color: white;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: var(--radius-full);
    vertical-align: middle;
    margin-left: 6px;
    letter-spacing: 0.5px;
}

.empty-state {
    text-align: center;
    padding: 60px var(--space-lg);
    color: var(--gray-400);
}

.empty-state-icon { font-size: 52px; margin-bottom: var(--space-md); }

/* ── Print Styles ──────────────────────────────────────────── */
@media print {
    body {
        background: white;
        padding: 0;
        font-size: 11px;
    }

    .container { box-shadow: none; border-radius: 0; }

    .header, header, nav, .top-nav,
    .input-section, .button-group, .no-print,
    .logout-btn, .user-info { display: none !important; }

    .batch-sheet { padding: 8mm; }

    .print-header { border: 2px solid #000; page-break-inside: avoid; }

    .procedure-table {
        page-break-inside: auto;
        font-size: 10px;
    }

    .procedure-table tr {
        page-break-inside: avoid;
        page-break-after: auto;
    }

    .procedure-table thead { display: table-header-group; }

    @page { size: landscape; margin: 8mm; }
}

/* Temperature Log (print only) */
.temperature-log { display: none; }

@media print {
    .temperature-log {
        display: block;
        page-break-before: always;
        padding: 8mm;
    }

    .temp-header {
        text-align: center;
        margin-bottom: var(--space-lg);
        border-bottom: 2px solid #333;
        padding-bottom: var(--space-sm);
    }

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

    .temp-table th,
    .temp-table td { border: 1px solid #333; padding: 8px; text-align: left; }

    .temp-table th { background: #333; color: white; }
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
    :root { --space-lg: 16px; --space-xl: 20px; }

    .header, header { padding: 0 var(--space-md); min-height: 56px; }
    .header h1, header h1 { font-size: 17px; }

    nav a, .header nav a { padding: 8px 10px; font-size: 13px; }

    .admin-grid { grid-template-columns: 1fr 1fr; gap: var(--space-md); padding: var(--space-md); }

    .batch-info-grid { grid-template-columns: repeat(2, 1fr); }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }

    .search-grid { grid-template-columns: 1fr; }

    .btn-primary, .btn-success, .btn-secondary, .btn-danger {
        width: 100%;
        justify-content: center;
    }

    .button-group { flex-direction: column; }
}

@media (max-width: 480px) {
    .admin-grid { grid-template-columns: 1fr; }
    .header h1, header h1 { font-size: 15px; }
    nav { gap: 2px; }
    nav a { padding: 8px; font-size: 12px; }
}

/* ── Touch device enhancements ─────────────────────────────── */
@media (hover: none) and (pointer: coarse) {
    /* Larger tap targets on actual touch devices */
    nav a, .header nav a { min-height: 54px; padding: 14px; }
    .action-btn, .btn, .btn-primary, .btn-success,
    .btn-danger, .btn-secondary { min-height: 54px; }
    .form-group input, .form-group select { min-height: 54px; font-size: 18px; }
    .admin-card a { min-height: 54px; font-size: 17px; }

    /* Remove hover effects on touch */
    .admin-card:hover { transform: none; }
    .btn-primary:hover, .btn-success:hover,
    .btn-danger:hover, .btn-secondary:hover { transform: none; }
}
</create-file>
/* ── Unified Category Nav Bar ──────────────────────────────────── */
.site-nav {
    background: #1a1a2e;
    border-bottom: 3px solid #4a90d9;
    padding: 0;
    display: flex;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.site-nav .nav-home {
    display: flex;
    align-items: center;
    padding: 0 18px;
    background: #4a90d9;
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: 0.5px;
    border-right: 2px solid #357abd;
    transition: background 0.2s;
    min-height: 46px;
}
.site-nav .nav-home:hover { background: #357abd; }
.site-nav .nav-category {
    display: flex;
    align-items: center;
    padding: 0 14px;
    background: #16213e;
    color: #7a9cc8;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    white-space: nowrap;
    border-right: 2px solid #2a2a4a;
    user-select: none;
}
.site-nav .nav-links-group {
    display: flex;
    align-items: stretch;
    flex-wrap: wrap;
    flex: 1;
}
.site-nav .nav-links-group a {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: #c8daf0;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    border-right: 1px solid #2a2a4a;
    transition: background 0.15s, color 0.15s;
}
.site-nav .nav-links-group a:hover {
    background: #2a3a5a;
    color: #fff;
}
.site-nav .nav-links-group a.active {
    background: #4a90d9;
    color: #fff;
    font-weight: 600;
}
@media (max-width: 768px) {
    .site-nav { position: relative; }
    .site-nav .nav-category { display: none; }
    .site-nav .nav-links-group a { padding: 10px 10px; font-size: 12px; }
    .site-nav .nav-home { padding: 0 12px; font-size: 13px; min-height: 42px; }
}