/* ==========================================================================
   Chromebook Inspection System - โรงเรียนวัดนาวง (มัธยมศึกษาตอนปลาย)
   Design System & Styling Rules
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
    --font-ui: 'Prompt', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-print: 'Sarabun', "TH Sarabun New", Arial, sans-serif;

    /* Color Palette */
    --primary-50: #f0fdf4;
    --primary-100: #dcfce7;
    --primary-500: #10b981;
    --primary-600: #059669;
    --primary-700: #047857;

    --teal-500: #14b8a6;
    --teal-600: #0d9488;
    --teal-700: #0f766e;

    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;

    --amber-500: #f59e0b;
    --amber-600: #d97706;
    --rose-500: #f43f5e;
    --rose-600: #e11d48;
    --blue-500: #3b82f6;

    /* Status Colors */
    --status-success-bg: #ecfdf5;
    --status-success-text: #047857;
    --status-success-border: #a7f3d0;

    --status-warning-bg: #fffbeb;
    --status-warning-text: #b45309;
    --status-warning-border: #fde68a;

    --status-danger-bg: #fff1f2;
    --status-danger-text: #be123c;
    --status-danger-border: #fecdd3;

    --status-info-bg: #eff6ff;
    --status-info-text: #1d4ed8;
    --status-info-border: #bfdbfe;

    /* UI Measurements */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--slate-100);
    color: var(--slate-800);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* --- FULLSCREEN LOGIN OVERLAY --- */
.login-screen {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, #0f172a 0%, #0d9488 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 1.5rem;
}

.login-screen.hidden {
    display: none !important;
}

.login-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 420px;
    overflow: hidden;
    animation: modalIn 0.3s ease;
}

.login-header {
    background-color: var(--slate-900);
    color: #ffffff;
    padding: 2rem 1.5rem 1.5rem;
    text-align: center;
}

.login-logo {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-100);
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header h2 { font-size: 1.35rem; font-weight: 700; }
.login-header p { font-size: 0.875rem; opacity: 0.8; }

.login-body { padding: 1.75rem 1.5rem 1.25rem; }

.login-error {
    background-color: var(--status-danger-bg);
    color: var(--status-danger-text);
    border: 1px solid var(--status-danger-border);
    padding: 0.6rem 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.login-footer {
    padding: 0.85rem 1.5rem;
    background-color: var(--slate-50);
    border-top: 1px solid var(--slate-200);
    text-align: center;
    font-size: 0.775rem;
    color: var(--slate-600);
}

/* --- Layout Container --- */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Topbar Styling --- */
.topbar {
    background: linear-gradient(135deg, var(--slate-900) 0%, var(--teal-700) 100%);
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem 1rem;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.school-logo {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    color: var(--primary-100);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.app-title {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.app-subtitle {
    font-size: 0.775rem;
    opacity: 0.85;
    font-weight: 300;
}

.topbar-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem 0.65rem;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.825rem;
    color: var(--primary-50);
    white-space: nowrap;
}

.form-select, .form-input {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--slate-300);
    background-color: #ffffff;
    color: var(--slate-800);
    outline: none;
    transition: all 0.2s ease;
}

.topbar .form-select {
    background-color: rgba(255, 255, 255, 0.95);
    border-color: transparent;
    font-weight: 500;
    text-overflow: ellipsis;
}

.form-select:focus, .form-input:focus {
    border-color: var(--teal-600);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
}

/* --- Main Navigation Tabs --- */
.main-nav {
    background-color: #ffffff;
    display: flex;
    border-bottom: 1px solid var(--slate-200);
    padding: 0 1.5rem;
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
}

.nav-tab {
    background: none;
    border: none;
    padding: 0.85rem 1.25rem;
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--slate-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav-tab:hover {
    color: var(--teal-600);
    background-color: var(--slate-50);
}

.nav-tab.active {
    color: var(--teal-700);
    border-bottom-color: var(--teal-600);
    font-weight: 600;
}

/* --- Content Area --- */
.content-area {
    flex: 1;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Footer Styling --- */
.app-footer {
    background-color: var(--slate-900);
    color: var(--slate-300);
    padding: 1rem 1.5rem;
    font-size: 0.875rem;
    border-top: 1px solid var(--slate-800);
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-left, .footer-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-right strong {
    color: var(--teal-500);
    font-weight: 600;
}

/* --- Buttons & Badges --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap; /* Prevents text wrap */
}

.btn-primary { background-color: var(--teal-600); color: #ffffff; }
.btn-primary:hover { background-color: var(--teal-700); }

.btn-success { background-color: var(--primary-600); color: #ffffff; }
.btn-success:hover { background-color: var(--primary-700); }

.btn-outline { background-color: transparent; border-color: var(--slate-300); color: var(--slate-700); }
.btn-outline:hover { background-color: var(--slate-100); }

.btn-outline-secondary { background-color: #ffffff; border-color: var(--slate-300); color: var(--slate-700); }
.btn-outline-secondary:hover { background-color: var(--slate-100); }

.btn-outline-danger { background-color: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.3); color: #ffffff; }
.btn-outline-danger:hover { background-color: var(--rose-600); border-color: var(--rose-600); }

.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; font-weight: 600; }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.badge-success { background-color: var(--status-success-bg); color: var(--status-success-text); border: 1px solid var(--status-success-border); }
.badge-warning { background-color: var(--status-warning-bg); color: var(--status-warning-text); border: 1px solid var(--status-warning-border); }
.badge-danger { background-color: var(--status-danger-bg); color: var(--status-danger-text); border: 1px solid var(--status-danger-border); }
.badge-info { background-color: var(--status-info-bg); color: var(--status-info-text); border: 1px solid var(--status-info-border); }

/* --- DASHBOARD STYLES --- */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.metric-card {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--slate-200);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.metric-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.metric-card.primary .metric-icon { background-color: var(--primary-100); color: var(--primary-700); }
.metric-card.success .metric-icon { background-color: var(--status-success-bg); color: var(--status-success-text); }
.metric-card.warning .metric-icon { background-color: var(--status-warning-bg); color: var(--status-warning-text); }
.metric-card.danger .metric-icon { background-color: var(--status-danger-bg); color: var(--status-danger-text); }
.metric-card.info .metric-icon { background-color: var(--status-info-bg); color: var(--status-info-text); }

.metric-info {
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.825rem;
    color: var(--slate-600);
}

.metric-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--slate-900);
}

.metric-value small {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--slate-600);
}

/* Dashboard Section & Class Grid */
.dashboard-section {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--slate-800);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.class-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.class-card {
    background-color: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    padding: 1rem;
    transition: all 0.2s ease;
}

.class-card:hover {
    border-color: var(--teal-500);
    background-color: #ffffff;
}

.class-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.class-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--slate-900);
}

.class-teacher {
    font-size: 0.8rem;
    color: var(--slate-600);
    margin-bottom: 0.75rem;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--slate-700);
    margin-bottom: 0.25rem;
}

.progress-bar {
    height: 8px;
    background-color: var(--slate-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--teal-600);
    transition: width 0.4s ease;
}

.progress-fill.fill-danger { background-color: var(--rose-500); }
.progress-fill.fill-warning { background-color: var(--amber-500); }
.progress-fill.fill-info { background-color: var(--blue-500); }

/* Dashboard Columns */
.dashboard-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .dashboard-columns { grid-template-columns: 1fr; }
}

.dashboard-box {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
}

.box-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--slate-100);
}

.box-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--slate-800);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.text-amber { color: var(--amber-500); }
.text-teal { color: var(--teal-600); }

.issue-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 280px;
    overflow-y: auto;
}

.issue-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 0.85rem;
    background-color: var(--slate-50);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--rose-500);
}

.issue-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
}

.issue-info p {
    font-size: 0.775rem;
    color: var(--slate-600);
}

.hardware-stats {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.hw-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.hw-icon {
    width: 36px;
    height: 36px;
    background-color: var(--slate-100);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--slate-700);
}

.hw-details {
    flex: 1;
}

.hw-title {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

/* --- TAB 2: INSPECTION FORM STYLES --- */
.filter-card {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 1rem;
}

.filter-item {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.filter-item label {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--slate-700);
}

.search-item {
    flex: 1;
    min-width: 240px;
}

.filter-actions {
    margin-left: auto;
}

/* Inspection Cards List */
.inspection-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.25rem;
}

.student-card {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.student-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--slate-300);
}

.student-card-header {
    background-color: var(--slate-50);
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--slate-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.student-identity {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.device-badge {
    background-color: var(--slate-900);
    color: #ffffff;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.student-name-group h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--slate-900);
    line-height: 1.2;
}

.student-meta {
    font-size: 0.775rem;
    color: var(--slate-600);
}

.student-card-body {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex: 1;
}

/* Checklist Item Grid */
.checklist-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.check-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.65rem;
    background-color: var(--slate-50);
    border-radius: var(--radius-sm);
    border: 1px solid var(--slate-200);
    font-size: 0.825rem;
    user-select: none;
    cursor: pointer;
    transition: all 0.15s ease;
}

.check-item:hover {
    background-color: var(--slate-100);
}

.check-item.checked {
    background-color: var(--status-success-bg);
    border-color: var(--status-success-border);
    color: var(--status-success-text);
    font-weight: 500;
}

.check-item.unchecked {
    background-color: var(--status-danger-bg);
    border-color: var(--status-danger-border);
    color: var(--status-danger-text);
}

.check-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.card-notes {
    margin-top: 0.25rem;
}

.card-notes textarea {
    width: 100%;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--slate-200);
    resize: vertical;
    min-height: 48px;
}

.student-card-footer {
    padding: 0.75rem 1rem;
    background-color: var(--slate-50);
    border-top: 1px solid var(--slate-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* --- TAB 3: INVENTORY TABLE STYLES --- */
.inventory-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.inventory-toolbar h2 {
    font-size: 1.15rem;
    font-weight: 700;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.search-box {
    position: relative;
    width: 320px;
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--slate-400);
}

.search-box input {
    padding-left: 2.2rem;
    width: 100%;
}

.table-responsive {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    text-align: left;
}

.data-table th {
    background-color: var(--slate-50);
    color: var(--slate-700);
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--slate-200);
}

.data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--slate-100);
    color: var(--slate-800);
}

.data-table tbody tr:hover {
    background-color: var(--slate-50);
}

/* --- TAB 4: PRINT DOCUMENT STYLES & PRINT MEDIA --- */
.report-toolbar {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.toolbar-options {
    display: flex;
    gap: 1.5rem;
}

.option-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.option-item label {
    font-size: 0.85rem;
    font-weight: 600;
}

/* Print Document Layout (A4 format preview) */
.print-document {
    background-color: #ffffff;
    padding: 2.5rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    max-width: 960px;
    margin: 0 auto;
    font-family: var(--font-print);
    color: #000000;
}

.doc-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    border-bottom: 2px solid #000000;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.doc-logo {
    font-size: 3rem;
    color: var(--teal-700);
}

.doc-title-group {
    flex: 1;
    text-align: center;
}

.doc-school {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.2;
}

.doc-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.doc-subtitle {
    font-size: 1rem;
    color: #444444;
}

.doc-meta {
    display: flex;
    justify-content: space-between;
    font-size: 1.05rem;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
}

.text-right { text-align: right; }

.doc-summary-box {
    display: flex;
    justify-content: space-around;
    background-color: #f8fafc;
    border: 1px solid #cbd5e1;
    padding: 0.65rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    border-radius: 4px;
}

.doc-table-container {
    margin-bottom: 2rem;
}

.doc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.doc-table th, .doc-table td {
    border: 1px solid #333333;
    padding: 0.45rem 0.5rem;
    text-align: center;
}

.doc-table th {
    background-color: #f1f5f9;
    font-weight: 600;
}

.doc-table td.text-left {
    text-align: left;
}

.doc-signatures {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.25rem;
    margin-top: 3rem;
    font-size: 0.925rem;
    text-align: center;
}

.sig-block p {
    margin-bottom: 0.5rem;
}

.sig-line-wrapper {
    display: flex;
    align-items: flex-end;
    width: 100%;
    white-space: nowrap;
    margin-bottom: 0.6rem;
}

.sig-prefix {
    white-space: nowrap;
    flex-shrink: 0;
}

.sig-dots {
    flex: 1;
    border-bottom: 1px dotted #000000;
    margin: 0 4px 3px 4px;
    height: 1px;
}

.sig-title {
    white-space: nowrap;
    flex-shrink: 0;
}

/* --- MODAL DIALOG --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal-box {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    background-color: var(--slate-900);
    color: #ffffff;
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 { font-size: 1.1rem; font-weight: 600; }
.modal-close { background: none; border: none; color: #ffffff; font-size: 1.5rem; cursor: pointer; }

.modal-body { padding: 1.25rem; }
.form-group { margin-bottom: 1rem; display: flex; flex-direction: column; gap: 0.35rem; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--slate-700); }
.modal-footer { display: flex; justify-content: flex-end; gap: 0.75rem; margin-top: 1.5rem; }

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 2000;
}

.toast {
    background-color: var(--slate-900);
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    animation: toastIn 0.3s ease;
}

.toast-success { border-left: 4px solid var(--primary-500); }
.toast-error { border-left: 4px solid var(--rose-500); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ==========================================================================
   MOBILE & TABLET RESPONSIVE SYSTEM
   ========================================================================== */
html, body {
    max-width: 100vw;
    overflow-x: hidden;
}

.app-container {
    max-width: 100vw;
    overflow-x: hidden;
}

@media (max-width: 768px) {
    /* Prevent Sticky Header Jump when typing on mobile keyboard */
    .topbar {
        position: relative;
        padding: 0.65rem 0.85rem;
        gap: 0.65rem;
        flex-direction: column;
        align-items: stretch;
    }

    .topbar-left {
        justify-content: space-between;
        width: 100%;
    }

    .topbar-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.4rem;
        width: 100%;
    }

    .control-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.15rem;
        width: 100%;
    }

    .control-group label {
        font-size: 0.75rem;
    }

    .control-group .form-input,
    .control-group .form-select {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box;
        font-size: 14px; /* Prevent iOS zoom shift */
    }

    .topbar-actions .btn {
        width: 100%;
        justify-content: center;
        font-size: 0.775rem;
        padding: 0.35rem 0.5rem;
    }

    .content-area {
        padding: 0.75rem 0.5rem;
    }

    /* Section Header Title Wrap Fix */
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.65rem;
    }

    .section-header h2 {
        font-size: 0.95rem;
        width: 100%;
        white-space: normal;
        line-height: 1.35;
    }

    .section-header > div {
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem;
    }

    .section-header .btn {
        flex: 1;
        justify-content: center;
        font-size: 0.775rem;
        white-space: nowrap;
    }

    /* Dashboard & Class Cards */
    .metrics-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.6rem;
    }

    .metric-card {
        padding: 0.75rem;
        gap: 0.5rem;
    }

    .metric-icon {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }

    .metric-value {
        font-size: 1.25rem;
    }

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

    /* Filter & Inspection List */
    .filter-card {
        padding: 0.85rem;
    }

    .filter-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.6rem;
    }

    .search-item {
        width: 100%;
        min-width: 100%;
    }

    .filter-actions {
        margin-left: 0;
        width: 100%;
    }

    .filter-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .inspection-list {
        grid-template-columns: 1fr;
    }

    .inventory-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .toolbar-right {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .search-box {
        width: 100%;
    }

    /* Signer Settings Card Grid on Mobile */
    #signerSettingsCard > div:nth-child(2) {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .topbar-actions {
        grid-template-columns: 1fr;
    }

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

/* ==========================================================================
   @MEDIA PRINT SPECIFICATION (FOR A4 PRINTING)
   ========================================================================== */
@media print {
    .no-print,
    .topbar,
    .main-nav,
    .filter-card,
    .report-toolbar,
    .app-footer,
    .modal-overlay,
    .toast-container,
    .login-screen,
    header, nav, button {
        display: none !important;
    }

    body {
        background-color: #ffffff !important;
        color: #000000 !important;
        font-family: var(--font-print) !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    .app-container {
        display: block !important;
    }

    .content-area {
        padding: 0 !important;
        max-width: 100% !important;
        margin: 0 !important;
    }

    .tab-content {
        display: none !important;
    }

    #tab-report.tab-content {
        display: block !important;
    }

    .print-document {
        box-shadow: none !important;
        padding: 0 !important;
        max-width: 100% !important;
        margin: 0 !important;
        width: 100% !important;
    }

    .doc-table th {
        background-color: #e2e8f0 !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .doc-signatures {
        display: grid !important;
        grid-template-columns: 1fr 1fr 1fr !important;
        gap: 1rem !important;
        page-break-inside: avoid !important;
        width: 100% !important;
        margin-top: 2.5rem !important;
    }

    .sig-block {
        text-align: center !important;
    }

    .sig-line-wrapper {
        display: flex !important;
        align-items: flex-end !important;
        width: 100% !important;
        white-space: nowrap !important;
    }

    @page {
        size: A4 portrait;
        margin: 1.5cm 1.5cm 1.5cm 1.5cm;
    }
}