/* ==============================================================================
   LabGuard SaaS — Core Design System & Global Brand Tokens
   ============================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

:root {
    /* Global Brand Color System */
    --color-bg: #FAF7F0;
    --color-surface: #FFFFFF;
    --color-text: #111822;
    --color-text-secondary: #595852;
    --color-border: #E6E1D5;
    --color-brand: #0F2038;
    --color-brand-hover: #193152;
    --color-brand-light: #EEF3F8;
    --color-brand-muted: #243B5A;

    /* Core Architectural Tokens */
    --primary: var(--color-brand);
    --primary-hover: var(--color-brand-hover);
    --primary-light: var(--color-brand-light);
    --primary-dark: #081220;

    --secondary: #595852;
    --secondary-hover: #3E3D39;
    --secondary-light: #F3EFE6;

    /* Semantic Status Accents (Calm & Non-competing) */
    --success: #1E6B43;
    --success-light: #EDF7F1;
    --success-border: #C6E7D2;

    --warning: #A16207;
    --warning-light: #FEF9EE;
    --warning-border: #FBE6B8;

    --danger: #B91C1C;
    --danger-light: #FEF2F2;
    --danger-border: #FECACA;

    --info: #1D4ED8;
    --info-light: #EFF6FF;
    --info-border: #BFDBFE;

    /* Neutrals Harmonized to Brand Canvas */
    --slate-900: #111822;
    --slate-800: #21262F;
    --slate-700: #383E48;
    --slate-600: #595852;
    --slate-500: #74726B;
    --slate-400: #9B988F;
    --slate-300: #CBC7BC;
    --slate-200: #E6E1D5;
    --slate-100: #F3EFE6;
    --slate-50: #F8F5EE;

    /* Surface Mappings */
    --bg-main: var(--color-bg);
    --bg-card: var(--color-surface);
    --text-main: var(--color-text);
    --text-muted: var(--color-text-secondary);
    --border-color: var(--color-border);

    /* Typography */
    --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Spacing Tokens */
    --space-2xs: 2px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Numeric Spacing Helpers */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* Font Size Scale */
    --text-2xs: 11px;
    --text-xs: 12px;
    --text-sm: 13px;
    --text-base: 14px;
    --text-md: 15px;
    --text-lg: 16px;
    --text-xl: 18px;
    --text-2xl: 22px;
    --text-3xl: 28px;
    --text-4xl: 36px;
    --text-5xl: 48px;

    /* Elevation / Shadows */
    --shadow-xs: 0 1px 2px rgba(17, 24, 34, 0.04);
    --shadow-sm: 0 2px 4px rgba(17, 24, 34, 0.04), 0 1px 2px rgba(17, 24, 34, 0.02);
    --shadow-md: 0 4px 8px -2px rgba(17, 24, 34, 0.05), 0 2px 4px -2px rgba(17, 24, 34, 0.03);
    --shadow-lg: 0 12px 20px -4px rgba(17, 24, 34, 0.07), 0 4px 6px -2px rgba(17, 24, 34, 0.03);
    --shadow-xl: 0 20px 28px -6px rgba(17, 24, 34, 0.09), 0 8px 10px -4px rgba(17, 24, 34, 0.04);

    /* Radii */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Animation Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index Layers */
    --z-dropdown: 100;
    --z-sticky: 500;
    --z-sidebar: 1000;
    --z-modal-backdrop: 2000;
    --z-modal: 2010;
    --z-toast: 3000;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.025em;
    line-height: 1.25;
}

a {
    color: var(--color-brand);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-brand-hover);
}

/* ==============================================================================
   Buttons & Clickables
   ============================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 600;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.2;
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled,
.btn[disabled] {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: auto;
    transform: none;
    box-shadow: none;
}

.btn-primary {
    background-color: var(--color-brand);
    color: #FFFFFF;
    border-color: var(--color-brand);
    box-shadow: 0 1px 2px rgba(15, 32, 56, 0.12);
}
.btn-primary:hover {
    background-color: var(--color-brand-hover);
    border-color: var(--color-brand-hover);
    color: #FFFFFF;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: #FFFFFF;
    color: var(--color-brand);
    border-color: var(--color-border);
}
.btn-secondary:hover {
    background-color: var(--slate-100);
    color: var(--color-brand);
    border-color: var(--slate-300);
}

.btn-danger {
    background-color: var(--danger);
    color: #FFFFFF;
    border-color: var(--danger);
}
.btn-danger:hover {
    background-color: #991b1b;
    border-color: #991b1b;
    color: #FFFFFF;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: var(--radius-xs);
}

.btn-xs {
    padding: 4px 8px;
    font-size: 12px;
    border-radius: var(--radius-xs);
}

.btn-md {
    padding: 10px 22px;
    font-size: 14px;
}

.btn-lg {
    padding: 14px 26px;
    font-size: 15px;
    border-radius: var(--radius-sm);
}

/* ==============================================================================
   Badges & Tags
   ============================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: var(--radius-full);
    text-transform: capitalize;
    border: 1px solid transparent;
}

.badge-success {
    background-color: var(--success-light);
    color: var(--success);
    border-color: var(--success-border);
}
.badge-warning {
    background-color: var(--warning-light);
    color: var(--warning);
    border-color: var(--warning-border);
}
.badge-danger {
    background-color: var(--danger-light);
    color: var(--danger);
    border-color: var(--danger-border);
}
.badge-primary {
    background-color: var(--primary-light);
    color: var(--color-brand);
    border-color: #D3E0EE;
}
.badge-secondary {
    background-color: var(--slate-100);
    color: var(--color-text-secondary);
    border-color: var(--color-border);
}

.code-tag, .code-badge {
    font-family: var(--font-mono);
    background: var(--slate-100);
    color: var(--color-text);
    padding: 2px 6px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--color-border);
    font-size: 12px;
}

/* ==============================================================================
   Alert Banners
   ============================================================================== */
.alert {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
    animation: fadeIn 0.25s ease;
}

.alert-success {
    background-color: var(--success-light);
    color: var(--success);
    border: 1px solid var(--success-border);
}
.alert-danger {
    background-color: var(--danger-light);
    color: var(--danger);
    border: 1px solid var(--danger-border);
}
.alert-warning {
    background-color: var(--warning-light);
    color: var(--warning);
    border: 1px solid var(--warning-border);
}

.alert-dismissing {
    transition: opacity 0.4s ease, transform 0.4s ease;
    opacity: 0;
    transform: translateY(-8px);
}

.alert-close {
    margin-left: auto;
    background: none;
    border: none;
    color: currentColor;
    opacity: 0.6;
    font-size: 18px;
    cursor: pointer;
    line-height: 1;
    padding: 0 4px;
    transition: opacity 0.15s ease;
}

.alert-close:hover {
    opacity: 1;
}

/* Compact Token Banner */
.token-compact-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px 16px;
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
    background-color: var(--warning-light);
    color: var(--color-text);
    border: 1px solid var(--warning-border);
    border-left: 4px solid var(--warning);
}

.token-code {
    background: var(--color-brand);
    color: #79B8FF;
    padding: 4px 10px;
    border-radius: var(--radius-xs);
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 700;
}

/* ==============================================================================
   Layout & Flex/Grid Utility Classes
   ============================================================================== */
.w-full { width: 100%; }
.h-full { height: 100%; }

.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-none { display: none; }

.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-align-center { display: flex; align-items: center; }
.flex-wrap { flex-wrap: wrap; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.cursor-pointer { cursor: pointer; }

.gap-xs { gap: 6px; }
.gap-sm { gap: 10px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }
.gap-xl { gap: 32px; }

.inline-form { display: inline; }
.action-group { display: inline-flex; gap: 6px; }

/* Text & Typography Helpers */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

.text-muted { color: var(--color-text-secondary); }
.text-subtle { color: var(--slate-400); }
.text-primary { color: var(--color-brand); }
.text-secondary { color: var(--color-text-secondary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-normal { font-weight: 400; }

.text-2xs { font-size: var(--text-2xs); }
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md { font-size: var(--text-md); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }

.bullet-dot { font-size: 7px; }

/* Margins */
.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-5 { margin-bottom: 20px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.ml-2 { margin-left: 8px; }

/* Containers & Max Widths */
.card-container-sm { max-width: 600px; margin: 0 auto; }
.card-container-md { max-width: 680px; margin: 0 auto; }
.card-container-lg { max-width: 820px; margin: 0 auto; }

/* Content Cards */
.content-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.content-card-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #FFFFFF;
}

.content-card-title {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.content-card-body {
    padding: 24px;
}

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
}

.data-table th {
    background: #FAF7F0;
    padding: 12px 18px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.data-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    vertical-align: middle;
    background: var(--color-surface);
}

.data-table tr:hover td {
    background-color: #FAF7F0;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.empty-state-cell {
    text-align: center;
    padding: 40px 20px !important;
    color: var(--color-text-secondary);
}

/* Two-column layout with sidebar form */
.grid-split-sidebar {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 24px;
    align-items: start;
}

.grid-split-sidebar-compact {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 24px;
    align-items: start;
}

@media (max-width: 992px) {
    .grid-split-sidebar,
    .grid-split-sidebar-compact {
        grid-template-columns: 1fr;
    }
}

/* Forms & Controls */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    font-family: inherit;
    font-size: 14px;
    color: var(--color-text);
    box-sizing: border-box;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-brand);
    box-shadow: 0 0 0 3px rgba(15, 32, 56, 0.08);
}

/* Multi-column Form Rows */
.form-row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

@media (max-width: 640px) {
    .form-row-2,
    .form-row-3 {
        grid-template-columns: 1fr;
    }
}

.form-group-action {
    display: flex;
    align-items: flex-end;
}

.form-static-input {
    background: var(--slate-100) !important;
    cursor: not-allowed;
}

.section-divider {
    margin: 24px 0;
    border: 0;
    border-top: 1px solid var(--color-border);
}

.form-hint {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    margin-top: 5px;
}

.form-checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--text-base);
    color: var(--color-text);
    cursor: pointer;
}

/* Filters & Search Toolbar */
.filter-bar {
    padding: 14px 24px;
    background: var(--slate-50);
    border-bottom: 1px solid var(--color-border);
}

.filter-form-row {
    display: flex;
    gap: 12px;
    align-items: center;
    width: 100%;
}

.filter-input-search { width: 280px; flex-shrink: 0; }
.filter-select { width: 180px; flex-shrink: 0; }
.filter-select-sm { width: 150px; flex-shrink: 0; }

.filter-form-row .btn {
    flex-shrink: 0;
    white-space: nowrap;
}

@media (max-width: 900px) {
    .filter-form-row {
        flex-wrap: wrap;
    }
}

.pagination-bar {
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--color-border);
    background: #FFFFFF;
}

/* Empty State Table Cell */
.empty-state-cell {
    text-align: center;
    padding: 44px 20px;
    color: var(--color-text-secondary);
    background: #FFFFFF;
}

/* Avatars & Media Box */
.avatar-profile-box {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--slate-50);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.avatar-profile-img {
    width: 72px;
    height: 72px;
    object-fit: contain;
    border-radius: var(--radius-xs);
    background: white;
    padding: 4px;
    border: 1px solid var(--color-border);
}

.avatar-profile-placeholder {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-xs);
    background: var(--primary-light);
    color: var(--color-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.student-table-photo {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--color-border);
}

.student-table-avatar-initials {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--color-brand);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
}

.stat-icon-primary {
    background: var(--primary-light) !important;
    color: var(--color-brand) !important;
}

.empty-icon-lg {
    font-size: 32px;
    margin-bottom: 8px;
    display: block;
    color: var(--slate-400);
}

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

/* ==============================================================================
   Lightweight Centered Popup Modals & Notifications
   ============================================================================== */
.popup-backdrop {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    opacity: 0;
    transition: opacity 0.18s ease;
}
.popup-backdrop.show { opacity: 1; }

.popup-card {
    background: #FFFFFF;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    box-shadow: 0 12px 32px rgba(15, 32, 56, 0.2);
    width: 100%;
    max-width: 400px;
    padding: 24px 20px;
    text-align: center;
    transform: scale(0.95);
    transition: transform 0.18s ease;
}
.popup-backdrop.show .popup-card { transform: scale(1); }

.popup-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.popup-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.popup-actions .btn {
    min-width: 120px;
}

.toast-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast-item {
    pointer-events: auto;
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-radius: 30px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    animation: fadeIn 0.2s ease;
}