/*
 * Praxisseminar Design System v1
 * Token-based, additive layer. Non sovrascrive classi esistenti (.btn-oth, .alert-oth, ecc.).
 * Tutte le classi sono prefissate con `ds-` per evitare collisioni.
 *
 * Usa: includere in base.html DOPO Bootstrap, PRIMA dei block style locali.
 */

/* =============================================================================
 * TOKENS — palette, scala spaziatura, tipografia
 * ============================================================================= */
:root {
    /* Brand & semantici */
    --ds-color-fg:        #0a0a0a;
    --ds-color-fg-muted:  #5a5a5a;
    --ds-color-fg-faint:  #8a8a8a;
    --ds-color-bg:        #ffffff;
    --ds-color-bg-soft:   #f7f7f8;
    --ds-color-bg-muted:  #ececee;
    --ds-color-border:    #d8d8da;
    --ds-color-border-strong: #b4b4b6;

    --ds-color-accent:    #0066cc;
    --ds-color-accent-hover: #004d99;
    --ds-color-accent-soft:  #e8f0fa;

    --ds-color-success:      #1f7a3f;
    --ds-color-success-soft: #d8eddf;
    --ds-color-warning:      #946400;
    --ds-color-warning-soft: #fdf2cd;
    --ds-color-danger:       #b3261e;
    --ds-color-danger-soft:  #fadbd8;
    --ds-color-info:         #0a5d8a;
    --ds-color-info-soft:    #d6ebf3;

    /* Spaziatura — scala 4 (rem-aware) */
    --ds-space-1: 0.25rem;   /* 4px  */
    --ds-space-2: 0.5rem;    /* 8px  */
    --ds-space-3: 0.75rem;   /* 12px */
    --ds-space-4: 1rem;      /* 16px */
    --ds-space-5: 1.25rem;   /* 20px */
    --ds-space-6: 1.5rem;    /* 24px */
    --ds-space-8: 2rem;      /* 32px */
    --ds-space-10: 2.5rem;   /* 40px */
    --ds-space-12: 3rem;     /* 48px */
    --ds-space-16: 4rem;     /* 64px */

    /* Tipografia */
    --ds-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    --ds-font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --ds-text-xs:  0.75rem;   /* 12px */
    --ds-text-sm:  0.875rem;  /* 14px */
    --ds-text-base: 1rem;     /* 16px */
    --ds-text-lg:  1.125rem;  /* 18px */
    --ds-text-xl:  1.25rem;   /* 20px */
    --ds-text-2xl: 1.5rem;    /* 24px */
    --ds-text-3xl: 1.875rem;  /* 30px */

    --ds-leading-tight: 1.25;
    --ds-leading-base:  1.5;
    --ds-leading-loose: 1.7;

    /* Forme */
    --ds-radius-sm: 4px;
    --ds-radius:    6px;
    --ds-radius-lg: 10px;
    --ds-radius-pill: 999px;

    /* Elevazione */
    --ds-shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --ds-shadow:    0 2px 6px rgba(0,0,0,0.08);
    --ds-shadow-lg: 0 8px 24px rgba(0,0,0,0.10);

    /* Motion */
    --ds-ease: cubic-bezier(0.2, 0, 0, 1);
    --ds-duration: 160ms;
}

/* =============================================================================
 * FOCUS RING — globale, applicato a TUTTI gli elementi interattivi
 * ============================================================================= */
:focus-visible {
    outline: 2px solid var(--ds-color-accent);
    outline-offset: 2px;
    border-radius: var(--ds-radius-sm);
}
button:focus-visible,
a:focus-visible,
[role="button"]:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--ds-color-accent);
    outline-offset: 2px;
}

/* =============================================================================
 * UTILITIES — singole proprietà
 * ============================================================================= */
.ds-stack > * + * { margin-top: var(--ds-space-4); }
.ds-stack-tight > * + * { margin-top: var(--ds-space-2); }
.ds-stack-loose > * + * { margin-top: var(--ds-space-6); }

.ds-cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--ds-space-3);
    align-items: center;
}
.ds-cluster-tight { gap: var(--ds-space-2); }
.ds-cluster-loose { gap: var(--ds-space-4); }

.ds-text-muted { color: var(--ds-color-fg-muted); }
.ds-text-faint { color: var(--ds-color-fg-faint); }
.ds-text-sm    { font-size: var(--ds-text-sm); }
.ds-text-xs    { font-size: var(--ds-text-xs); }
.ds-text-mono  { font-family: var(--ds-font-mono); }

.ds-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* =============================================================================
 * CARD — contenitore pulito, bordo sottile, padding standard
 * ============================================================================= */
.ds-card {
    background: var(--ds-color-bg);
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius);
    padding: var(--ds-space-5);
}
.ds-card-soft {
    background: var(--ds-color-bg-soft);
    border-color: transparent;
}
.ds-card-hover {
    transition: border-color var(--ds-duration) var(--ds-ease),
                box-shadow var(--ds-duration) var(--ds-ease);
}
.ds-card-hover:hover {
    border-color: var(--ds-color-border-strong);
    box-shadow: var(--ds-shadow);
}
.ds-card-accent { border-left: 3px solid var(--ds-color-accent); }
.ds-card-warning { border-left: 3px solid var(--ds-color-warning); background: var(--ds-color-warning-soft); }
.ds-card-danger { border-left: 3px solid var(--ds-color-danger); background: var(--ds-color-danger-soft); }
.ds-card-success { border-left: 3px solid var(--ds-color-success); background: var(--ds-color-success-soft); }

/* =============================================================================
 * BUTTON — un'unica implementazione, varianti via classi
 * ============================================================================= */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ds-space-2);
    padding: 0.55rem var(--ds-space-4);
    font-size: var(--ds-text-sm);
    font-weight: 500;
    line-height: 1.2;
    border: 1px solid transparent;
    border-radius: var(--ds-radius-sm);
    background: var(--ds-color-fg);
    color: var(--ds-color-bg);
    cursor: pointer;
    text-decoration: none;
    transition: background var(--ds-duration) var(--ds-ease),
                border-color var(--ds-duration) var(--ds-ease),
                color var(--ds-duration) var(--ds-ease);
}
.ds-btn:hover { background: #1f1f1f; color: var(--ds-color-bg); }
.ds-btn:disabled,
.ds-btn[aria-disabled="true"] {
    opacity: 0.55;
    cursor: not-allowed;
}

.ds-btn-secondary {
    background: var(--ds-color-bg);
    color: var(--ds-color-fg);
    border-color: var(--ds-color-border-strong);
}
.ds-btn-secondary:hover {
    background: var(--ds-color-bg-soft);
    color: var(--ds-color-fg);
}

.ds-btn-ghost {
    background: transparent;
    color: var(--ds-color-fg-muted);
    border-color: transparent;
}
.ds-btn-ghost:hover {
    background: var(--ds-color-bg-soft);
    color: var(--ds-color-fg);
}

.ds-btn-danger {
    background: var(--ds-color-danger);
    color: var(--ds-color-bg);
}
.ds-btn-danger:hover { background: #8c1c17; color: var(--ds-color-bg); }

.ds-btn-success {
    background: var(--ds-color-success);
    color: var(--ds-color-bg);
}
.ds-btn-success:hover { background: #185f30; color: var(--ds-color-bg); }

.ds-btn-sm {
    padding: 0.35rem var(--ds-space-3);
    font-size: var(--ds-text-xs);
}
.ds-btn-lg {
    padding: 0.75rem var(--ds-space-6);
    font-size: var(--ds-text-base);
}

/* =============================================================================
 * BADGE — stato compatto
 * ============================================================================= */
.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    padding: 0.18em 0.6em;
    font-size: var(--ds-text-xs);
    font-weight: 600;
    line-height: 1.4;
    border-radius: var(--ds-radius-pill);
    background: var(--ds-color-bg-muted);
    color: var(--ds-color-fg);
    white-space: nowrap;
}
.ds-badge-success { background: var(--ds-color-success-soft); color: var(--ds-color-success); }
.ds-badge-warning { background: var(--ds-color-warning-soft); color: var(--ds-color-warning); }
.ds-badge-danger  { background: var(--ds-color-danger-soft);  color: var(--ds-color-danger); }
.ds-badge-info    { background: var(--ds-color-info-soft);    color: var(--ds-color-info); }
.ds-badge-accent  { background: var(--ds-color-accent-soft);  color: var(--ds-color-accent); }

/* =============================================================================
 * ALERT — più severo, più leggibile dei .alert-oth esistenti
 * ============================================================================= */
.ds-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--ds-space-3);
    padding: var(--ds-space-4);
    border-radius: var(--ds-radius);
    border: 1px solid var(--ds-color-border);
    background: var(--ds-color-bg);
    line-height: var(--ds-leading-base);
}
.ds-alert-icon {
    flex: 0 0 auto;
    font-size: 1.25rem;
    line-height: 1;
}
.ds-alert-body { flex: 1; min-width: 0; }
.ds-alert-title {
    font-weight: 600;
    margin: 0 0 var(--ds-space-1);
}
.ds-alert-success { background: var(--ds-color-success-soft); border-color: var(--ds-color-success); color: var(--ds-color-success); }
.ds-alert-warning { background: var(--ds-color-warning-soft); border-color: var(--ds-color-warning); color: var(--ds-color-warning); }
.ds-alert-danger  { background: var(--ds-color-danger-soft);  border-color: var(--ds-color-danger);  color: var(--ds-color-danger); }
.ds-alert-info    { background: var(--ds-color-info-soft);    border-color: var(--ds-color-info);    color: var(--ds-color-info); }

/* =============================================================================
 * INPUT / SELECT / TEXTAREA — base coerente
 * ============================================================================= */
.ds-input,
.ds-select,
.ds-textarea {
    display: block;
    width: 100%;
    padding: 0.5rem var(--ds-space-3);
    font-size: var(--ds-text-sm);
    font-family: inherit;
    line-height: 1.4;
    color: var(--ds-color-fg);
    background: var(--ds-color-bg);
    border: 1px solid var(--ds-color-border-strong);
    border-radius: var(--ds-radius-sm);
    transition: border-color var(--ds-duration) var(--ds-ease),
                box-shadow var(--ds-duration) var(--ds-ease);
}
.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
    border-color: var(--ds-color-accent);
    outline: none;
    box-shadow: 0 0 0 3px var(--ds-color-accent-soft);
}
.ds-input[aria-invalid="true"],
.ds-select[aria-invalid="true"] {
    border-color: var(--ds-color-danger);
}

.ds-label {
    display: block;
    font-size: var(--ds-text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ds-color-fg-muted);
    margin-bottom: var(--ds-space-2);
}
.ds-helper {
    font-size: var(--ds-text-xs);
    color: var(--ds-color-fg-muted);
    margin-top: var(--ds-space-1);
}
.ds-error {
    font-size: var(--ds-text-xs);
    color: var(--ds-color-danger);
    margin-top: var(--ds-space-1);
}

/* =============================================================================
 * KPI BANNER — il banner che usiamo su admin/professor dashboard
 * ============================================================================= */
.ds-kpi-banner {
    display: flex;
    flex-wrap: wrap;
    gap: var(--ds-space-4);
    align-items: stretch;
    padding: var(--ds-space-5);
    margin: 0 0 var(--ds-space-6);
    background: var(--ds-color-bg);
    border: 1px solid var(--ds-color-border);
    border-left: 4px solid var(--ds-color-fg);
    border-radius: var(--ds-radius);
}
.ds-kpi-banner__cell {
    flex: 1;
    min-width: 180px;
}
.ds-kpi-banner__divider {
    width: 1px;
    background: var(--ds-color-border);
    flex: 0 0 auto;
}
.ds-kpi-banner__cell--alert {
    background: var(--ds-color-danger-soft);
    border-radius: var(--ds-radius-sm);
    padding: var(--ds-space-2) var(--ds-space-3);
    margin: calc(-1 * var(--ds-space-2)) 0;
    color: var(--ds-color-danger);
}
.ds-kpi-banner__cell--warn {
    background: var(--ds-color-warning-soft);
    border-radius: var(--ds-radius-sm);
    padding: var(--ds-space-2) var(--ds-space-3);
    margin: calc(-1 * var(--ds-space-2)) 0;
    color: var(--ds-color-warning);
}
.ds-kpi-label {
    font-size: var(--ds-text-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ds-color-fg-muted);
    margin-bottom: var(--ds-space-1);
    font-weight: 600;
}
.ds-kpi-banner__cell--alert .ds-kpi-label,
.ds-kpi-banner__cell--warn .ds-kpi-label {
    color: inherit;
}
.ds-kpi-value {
    font-size: var(--ds-text-2xl);
    font-weight: 700;
    line-height: 1.1;
}
.ds-kpi-meta {
    font-size: var(--ds-text-sm);
    color: var(--ds-color-fg-muted);
    margin-top: var(--ds-space-1);
}
.ds-kpi-banner__cell--alert .ds-kpi-meta,
.ds-kpi-banner__cell--warn .ds-kpi-meta { color: inherit; opacity: 0.85; }

/* =============================================================================
 * NOTICE LINK — banner cliccabile (Wiedervorlage scadenza nel prof dashboard)
 * ============================================================================= */
.ds-notice {
    display: flex;
    align-items: center;
    gap: var(--ds-space-3);
    padding: var(--ds-space-3) var(--ds-space-4);
    border-radius: var(--ds-radius);
    border-left: 3px solid;
    text-decoration: none;
    color: inherit;
    transition: background var(--ds-duration) var(--ds-ease);
}
.ds-notice:hover { filter: brightness(0.97); }
.ds-notice-icon { font-size: 1.5rem; line-height: 1; flex: 0 0 auto; }
.ds-notice-body { flex: 1; min-width: 0; }
.ds-notice-title { font-weight: 600; font-size: var(--ds-text-base); }
.ds-notice-meta  { font-size: var(--ds-text-sm); opacity: 0.85; }
.ds-notice-link  { font-size: var(--ds-text-sm); text-decoration: underline; flex: 0 0 auto; }
.ds-notice-danger  { background: var(--ds-color-danger-soft); color: var(--ds-color-danger); border-color: var(--ds-color-danger); }
.ds-notice-warning { background: var(--ds-color-warning-soft); color: var(--ds-color-warning); border-color: var(--ds-color-warning); }
.ds-notice-info    { background: var(--ds-color-info-soft); color: var(--ds-color-info); border-color: var(--ds-color-info); }
.ds-notice-success { background: var(--ds-color-success-soft); color: var(--ds-color-success); border-color: var(--ds-color-success); }

/* =============================================================================
 * MOBILE — burger button (usato in base.html)
 * ============================================================================= */
.ds-burger {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--ds-color-border);
    background: var(--ds-color-bg);
    border-radius: var(--ds-radius-sm);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}
.ds-burger:hover { background: var(--ds-color-bg-soft); }
.ds-burger-icon,
.ds-burger-icon::before,
.ds-burger-icon::after {
    content: "";
    display: block;
    width: 18px;
    height: 2px;
    background: var(--ds-color-fg);
    border-radius: 2px;
    position: relative;
    transition: transform var(--ds-duration) var(--ds-ease);
}
.ds-burger-icon::before { position: absolute; top: -6px; left: 0; }
.ds-burger-icon::after  { position: absolute; top:  6px; left: 0; }
.ds-burger[aria-expanded="true"] .ds-burger-icon { background: transparent; }
.ds-burger[aria-expanded="true"] .ds-burger-icon::before { transform: translateY(6px) rotate(45deg); }
.ds-burger[aria-expanded="true"] .ds-burger-icon::after  { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 768px) {
    .ds-burger { display: inline-flex; }
}

/* =============================================================================
 * EMPTY STATE — sostituisce/integra .empty-state-oth in base.html
 * ============================================================================= */
.ds-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--ds-space-12) var(--ds-space-5);
    background: var(--ds-color-bg-soft);
    border: 1px dashed var(--ds-color-border);
    border-radius: var(--ds-radius-lg);
    color: var(--ds-color-fg-muted);
}
.ds-empty-icon {
    font-size: 2.5rem;
    color: var(--ds-color-fg-faint);
    margin-bottom: var(--ds-space-3);
    line-height: 1;
}
.ds-empty-title {
    font-size: var(--ds-text-lg);
    font-weight: 600;
    color: var(--ds-color-fg);
    margin-bottom: var(--ds-space-1);
}
.ds-empty-subtitle {
    font-size: var(--ds-text-sm);
    margin-bottom: var(--ds-space-4);
    max-width: 480px;
}

/* =============================================================================
 * SKELETON — placeholder durante il caricamento (anti-CLS)
 * ============================================================================= */
.ds-skeleton {
    display: inline-block;
    background: linear-gradient(90deg,
        var(--ds-color-bg-muted) 0%,
        var(--ds-color-bg-soft) 50%,
        var(--ds-color-bg-muted) 100%);
    background-size: 200% 100%;
    border-radius: var(--ds-radius-sm);
    animation: ds-skeleton-shimmer 1.6s linear infinite;
    color: transparent;
    user-select: none;
}
@keyframes ds-skeleton-shimmer {
    from { background-position: -100% 0; }
    to   { background-position: 100% 0; }
}

/* =============================================================================
 * TABLE — usabile come opt-in (.ds-table) o per .protokoll-table esistente
 * ============================================================================= */
.ds-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--ds-text-sm);
}
.ds-table thead {
    background: var(--ds-color-bg-soft);
    border-bottom: 1px solid var(--ds-color-border-strong);
}
.ds-table th {
    text-align: left;
    padding: var(--ds-space-3) var(--ds-space-4);
    font-weight: 600;
    font-size: var(--ds-text-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ds-color-fg-muted);
}
.ds-table td {
    padding: var(--ds-space-3) var(--ds-space-4);
    border-bottom: 1px solid var(--ds-color-border);
}
.ds-table tbody tr {
    transition: background var(--ds-duration) var(--ds-ease);
}
.ds-table tbody tr:hover {
    background: var(--ds-color-bg-soft);
}

/* =============================================================================
 * ACTION BUTTON GRID — per admin dashboard quick actions
 * ============================================================================= */
.ds-action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--ds-space-3);
}
.ds-action-grid > a,
.ds-action-grid > button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--ds-space-2);
    padding: var(--ds-space-5);
    background: var(--ds-color-bg);
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius);
    text-decoration: none;
    color: var(--ds-color-fg);
    font-size: var(--ds-text-sm);
    font-weight: 500;
    transition: border-color var(--ds-duration) var(--ds-ease),
                box-shadow var(--ds-duration) var(--ds-ease),
                transform var(--ds-duration) var(--ds-ease);
}
.ds-action-grid > a:hover,
.ds-action-grid > button:hover {
    border-color: var(--ds-color-fg);
    box-shadow: var(--ds-shadow);
    transform: translateY(-1px);
}
.ds-action-grid i {
    font-size: 1.5rem;
    color: var(--ds-color-fg-muted);
}

/* =============================================================================
 * Migliora alcune classi ESISTENTI senza romperle (cherry-pick)
 * ============================================================================= */
/* Card admin dashboard quick-actions: lift hover */
.action-btn {
    transition: border-color var(--ds-duration) var(--ds-ease),
                box-shadow var(--ds-duration) var(--ds-ease),
                transform var(--ds-duration) var(--ds-ease);
}
.action-btn:hover {
    transform: translateY(-1px);
}

/* Badge esistenti — rendiamoli più consistenti */
.badge-oth, .pruefer-badge, .status-badge {
    font-variant-numeric: tabular-nums;
}

/* =============================================================================
 * RIDUCE animazioni se l'utente lo richiede (a11y)
 * ============================================================================= */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}