/**
 * LEBAR Design System
 * Shared tokens, typography, and component primitives.
 */

:root {
    /* Brand */
    --color-primary: #1a1a2e;
    --color-primary-light: #2d2d44;
    --color-accent: #3f6ad8;
    --color-accent-hover: #2f5bc4;
    --color-accent-soft: rgba(63, 106, 216, 0.1);

    /* Neutrals */
    --color-bg: #f4f6f9;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-inverse: #ffffff;

    /* Semantic */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-full: 9999px;

    /* Shadows */
    --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 -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 80px;
    --header-height: 60px;
    --content-max-width: 1400px;
}

/* Base typography */
body {
    font-family: var(--font-sans);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text);
    font-weight: 600;
    line-height: var(--line-height-tight);
}

/* Focus accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-2) var(--space-4);
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
}

/* ─── Frontend auth / landing shell ─── */
.auth-shell {
    min-height: 100vh;
    min-height: 100dvh;
    background: linear-gradient(135deg, #e8ecf1 0%, #f4f6f9 50%, #e2e8f0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    overflow-x: hidden;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-8) var(--space-6);
    border: 1px solid var(--color-border);
}

.auth-card--wide {
    max-width: 600px;
}

.auth-card--catalogue {
    max-width: 720px;
}

.auth-card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-2);
    text-align: center;
}

.auth-card__subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: var(--space-6);
}

/* Action buttons (frontend) */
.btn-action {
    display: block;
    width: 100%;
    padding: 0.875rem var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1;
    text-align: center;
    color: var(--color-text-inverse);
    background-color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-base);
    margin-bottom: var(--space-3);
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-action:hover,
.btn-action:focus {
    color: var(--color-primary);
    background-color: var(--color-surface);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-action--outline {
    background-color: transparent;
    color: var(--color-primary);
}

.btn-action--outline:hover {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-action-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    width: 100%;
}

/* Language switcher */
.lang-switcher {
    position: fixed;
    right: var(--space-4);
    top: var(--space-4);
    z-index: 1030;
    min-width: 130px;
}

.lang-switcher--inline {
    position: static;
    min-width: 120px;
}

.lang-switcher select {
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    min-height: 36px;
}

/* Frontend navbar */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1020;
}

.site-navbar {
    padding: var(--space-2) 0;
}

.site-navbar .navbar-brand {
    font-weight: 600;
    color: var(--color-text);
    font-size: var(--font-size-lg);
}

.site-navbar .nav-link {
    color: var(--color-text);
    font-weight: 500;
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
    min-height: 44px;
    display: flex;
    align-items: center;
}

.site-navbar .nav-link:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.site-navbar .navbar-toggler {
    border: 1px solid var(--color-border);
    padding: var(--space-2);
    border-radius: var(--radius-md);
}

.site-navbar .navbar-toggler:focus {
    box-shadow: 0 0 0 2px var(--color-accent-soft);
}

/* Page content wrapper */
.page-content {
    padding: var(--space-4);
    max-width: var(--content-max-width);
    margin: 0 auto;
    width: 100%;
}

@media (min-width: 768px) {
    .page-content {
        padding: var(--space-6) var(--space-8);
    }
}

/* Form improvements */
.form-control {
    border-radius: var(--radius-md);
    border-color: var(--color-border);
    font-size: var(--font-size-sm);
    min-height: 42px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.form-label,
label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.has-error,
.error,
.is-invalid {
    color: var(--color-danger);
    font-size: var(--font-size-xs);
    margin-top: var(--space-1);
    display: block;
}

/* Card component */
.ds-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.ds-card__header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.ds-card__body {
    padding: var(--space-5);
}

/* Stat widget (dashboard) */
.stat-card {
    border-radius: var(--radius-lg);
    border: none;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.stat-card .widget-heading {
    font-size: var(--font-size-sm);
    font-weight: 500;
    opacity: 0.9;
}

.stat-card .widget-numbers {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

/* Responsive table card fallback */
@media (max-width: 767.98px) {
    .table-card-view thead {
        display: none;
    }
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    z-index: 1040;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.sidebar-overlay.is-visible {
    display: block;
    opacity: 1;
}

/* Utility: prevent horizontal scroll */
html, body {
    overflow-x: hidden;
    max-width: 100vw;
}

/* Confirm status */
.confirm {
    color: var(--color-success) !important;
}

/* Table color override */
.table-color {
    color: var(--color-text) !important;
}

.page-title-heading {
    color: var(--color-text);
}

#manage_all {
    color: var(--color-text) !important;
}

/* Chart container */
.chart-container {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    border: 1px solid var(--color-border);
    margin-top: var(--space-4);
    overflow-x: auto;
}

.chart-container canvas {
    max-width: 100%;
}

/* Responsive grid for catalogue buttons */
.catalogue-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3);
    width: 100%;
}

@media (min-width: 480px) {
    .catalogue-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .catalogue-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
}