/* Author: Francesco Cucinotta <francesco.cucinotta@gmail.com>
 * Project: Praxisseminar OTH Regensburg
 *
 * Strato di "eleganza" sopra base-chrome.css.
 * RISPETTA la palette ufficiale OTH (--oth-black, --oth-gray,
 * --oth-light, --oth-border, --oth-blue) e i token semantici
 * (--status-*). Aggiunge:
 *  - micro-interactions (hover/active/focus raffinati)
 *  - ombre piu' morbide
 *  - tipografia bilanciata
 *  - badge/chip eleganti
 *  - form raffinati
 *  - empty state migliorato
 *  - utility ds-* eleganti
 *
 * Niente nuovi brand color. Niente gradient extra-OTH.
 */

/* ===== Token complementari (derivati dai colori OTH) ===== */
:root {
    --ds-shadow-1: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 1px rgba(0, 0, 0, 0.03);
    --ds-shadow-2: 0 2px 6px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.04);
    --ds-shadow-3: 0 6px 18px rgba(0, 0, 0, 0.07), 0 3px 6px rgba(0, 0, 0, 0.05);
    --ds-shadow-hover: 0 10px 28px rgba(0, 0, 0, 0.10), 0 5px 10px rgba(0, 0, 0, 0.06);

    --oth-light-2: #f3f3f3;
    --oth-gray-fg-strong: #5a5a5a;
    --oth-gray-fg-soft:   #707070;
    --oth-border-soft:    #ececec;
    --oth-border-strong:  #c8c8c8;

    --ds-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
    --ds-ease-out: cubic-bezier(0, 0, 0.2, 1);

    --ds-radius-1: 4px;
    --ds-radius-2: 6px;
    --ds-radius-3: 10px;

    /* ALIAS LEGACY: i template storici usano --oth-success/warning/danger/info.
       Li mappiamo ai token semantici OTH derivati (accessibili AA) cosi'
       qualsiasi template "vecchio" eredita automaticamente la palette
       corretta, senza dover ridefinire :root al suo interno (drift). */
    --oth-success: var(--status-success);
    --oth-warning: var(--status-warning);
    --oth-danger:  var(--status-danger);
    --oth-info:    var(--status-info);
    --oth-white:   #fff;
    --oth-light-gray: var(--oth-light);
}

/* ===== Tipografia raffinata ===== */
body {
    font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}
h1, .h1, .ds-h1 { font-weight: 600; letter-spacing: -0.015em; line-height: 1.18; }
h2, .h2, .ds-h2 { font-weight: 600; letter-spacing: -0.01em;  line-height: 1.25; }
h3, .h3, .ds-h3 { font-weight: 600; letter-spacing: -0.005em; line-height: 1.3; }

.ds-text-muted-strong { color: var(--oth-gray-fg-strong); }
.ds-text-uppercase-eyebrow {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--oth-gray-fg-strong);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* ===== Link OTH ===== */
a, .link-oth {
    color: var(--oth-blue);
    text-decoration: underline;
    text-decoration-color: rgba(0, 102, 204, 0.4);
    text-underline-offset: 2px;
    transition: text-decoration-color 0.18s var(--ds-ease), color 0.18s var(--ds-ease);
}
a:hover, .link-oth:hover {
    text-decoration-color: var(--oth-blue);
}

/* ===== Card eleganti ===== */
.card {
    border-color: var(--oth-border-soft);
    box-shadow: var(--ds-shadow-1);
    border-radius: var(--ds-radius-2);
    transition: box-shadow 0.18s var(--ds-ease), transform 0.18s var(--ds-ease);
    background: #fff;
}
.card.shadow-sm  { box-shadow: var(--ds-shadow-1) !important; }
.card.shadow     { box-shadow: var(--ds-shadow-2) !important; }
.card.shadow-lg  { box-shadow: var(--ds-shadow-3) !important; }
.card-hoverable:hover,
a.card:hover,
.card.is-hoverable:hover {
    box-shadow: var(--ds-shadow-hover);
    transform: translateY(-1px);
}
.card-header {
    background: #fafafa;
    border-bottom-color: var(--oth-border-soft);
    font-weight: 600;
}

/* ===== Bottoni OTH raffinati ===== */
.btn {
    border-radius: var(--ds-radius-1);
    font-weight: 500;
    letter-spacing: 0.005em;
    transition: background-color 0.16s var(--ds-ease), color 0.16s var(--ds-ease),
                border-color 0.16s var(--ds-ease), box-shadow 0.16s var(--ds-ease),
                transform 0.08s var(--ds-ease);
}
.btn-dark {
    background: var(--oth-black);
    border-color: var(--oth-black);
}
.btn-dark:hover,
.btn-dark:focus-visible {
    background: #1a1a1a;
    border-color: #1a1a1a;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}
.btn-dark:active {
    background: #000;
    transform: translateY(1px);
    box-shadow: none;
}
.btn-outline-dark {
    border-color: var(--oth-border-strong);
    color: var(--oth-black);
    background: #fff;
}
.btn-outline-dark:hover,
.btn-outline-dark:focus-visible {
    background: var(--oth-black);
    border-color: var(--oth-black);
    color: #fff;
}
.btn-link {
    color: var(--oth-blue);
    text-decoration: none;
    padding-left: 0;
    padding-right: 0;
}
.btn-link:hover { text-decoration: underline; }

/* ===== Form raffinati ===== */
.form-control, .form-select {
    border-color: var(--oth-border-strong);
    border-radius: var(--ds-radius-1);
    transition: border-color 0.15s var(--ds-ease),
                box-shadow 0.15s var(--ds-ease);
}
.form-control:focus, .form-select:focus {
    border-color: var(--oth-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.14);
}
.form-control[aria-invalid="true"] {
    border-color: var(--status-danger);
    box-shadow: 0 0 0 3px rgba(179, 38, 30, 0.12);
}
.form-control:disabled, .form-select:disabled {
    background: var(--oth-light);
    color: var(--oth-gray-fg-strong);
}
.form-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--oth-black);
    margin-bottom: 0.35rem;
}
.form-text {
    color: var(--oth-gray-fg-strong);
    font-size: 0.825rem;
}

/* ===== Badge raffinati ===== */
.badge {
    font-weight: 500;
    letter-spacing: 0.01em;
    border-radius: var(--ds-radius-1);
    padding: 0.32em 0.65em;
}
.badge.bg-dark { background: var(--oth-black) !important; }
.badge.bg-secondary {
    background: var(--oth-light) !important;
    color: var(--oth-black) !important;
    border: 1px solid var(--oth-border-soft);
}
.badge-soft-success { background: #e8f5ed; color: var(--status-success); border: 1px solid #c9e7d4; }
.badge-soft-warning { background: #fcf2db; color: var(--status-warning); border: 1px solid #f0d99c; }
.badge-soft-danger  { background: #fbe9e7; color: var(--status-danger);  border: 1px solid #f0c2bc; }
.badge-soft-info    { background: #e6f0fa; color: var(--oth-blue);       border: 1px solid #b9d4ee; }

/* ===== Tabelle raffinate ===== */
.table { --bs-table-bg: transparent; }
.table > :not(caption) > * > * {
    padding: 0.75rem 0.85rem;
    vertical-align: middle;
}
.table thead th {
    border-bottom: 1px solid var(--oth-border-strong);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--oth-gray-fg-strong);
    background: #fafafa;
}
.table-hover tbody tr:hover {
    background: #fafafa;
    transition: background-color 0.12s var(--ds-ease);
}

/* ===== Navbar OTH micro-polish ===== */
.nav-oth { box-shadow: 0 1px 0 var(--oth-border-soft); }
.nav-links a:focus-visible { outline-offset: -2px; }

/* ===== Alert raffinati ===== */
.alert-oth {
    background: #fafafa;
    border-left: 3px solid var(--oth-border-strong);
    color: var(--oth-black);
    border-radius: 2px;
}
.alert-oth.alert-success { background: #f4faf6; border-left-color: var(--status-success); }
.alert-oth.alert-danger  { background: #fcf3f2; border-left-color: var(--status-danger);  }
.alert-oth.alert-warning { background: #fdf8ea; border-left-color: var(--status-warning); }
.alert-oth.alert-info    { background: #f3f8fd; border-left-color: var(--status-info);    }

/* ===== Section header riusabile ===== */
.ds-page-header {
    padding: 1.5rem 0 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--oth-border-soft);
}
.ds-page-header h1 { font-size: 1.5rem; margin: 0; }
.ds-page-header .ds-subtitle {
    font-size: 0.9rem;
    color: var(--oth-gray-fg-strong);
    margin-top: 0.25rem;
}

/* ===== Empty state piu' invitante ===== */
.empty-state-oth {
    background: linear-gradient(180deg, #fff 0%, var(--oth-light) 100%);
    border: 1px solid var(--oth-border-soft);
    border-radius: var(--ds-radius-3);
    box-shadow: var(--ds-shadow-1);
}
.empty-state-oth .empty-icon {
    background: #fff;
    width: 64px; height: 64px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--oth-border-soft);
    box-shadow: var(--ds-shadow-1);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

/* ===== KPI tile (numero grande sopra label piccola) ===== */
.ds-kpi {
    background: #fff;
    border: 1px solid var(--oth-border-soft);
    border-radius: var(--ds-radius-2);
    padding: 1rem 1.1rem;
    box-shadow: var(--ds-shadow-1);
    transition: box-shadow 0.18s var(--ds-ease), transform 0.18s var(--ds-ease);
}
.ds-kpi:hover { box-shadow: var(--ds-shadow-2); transform: translateY(-1px); }
.ds-kpi .ds-kpi-label {
    font-size: 0.75rem;
    color: var(--oth-gray-fg-strong);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.25rem;
}
.ds-kpi .ds-kpi-value {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--oth-black);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}
.ds-kpi .ds-kpi-trend {
    font-size: 0.8rem;
    color: var(--oth-gray-fg-strong);
    margin-top: 0.25rem;
}

/* ===== Utility eleganti ===== */
.ds-divider {
    height: 1px;
    background: var(--oth-border-soft);
    margin: 1.5rem 0;
}
.ds-hover-lift {
    transition: box-shadow 0.18s var(--ds-ease), transform 0.18s var(--ds-ease);
}
.ds-hover-lift:hover {
    box-shadow: var(--ds-shadow-hover);
    transform: translateY(-1px);
}
::selection {
    background: rgba(0, 102, 204, 0.15);
    color: var(--oth-black);
}

/* ===== Dropdown raffinato ===== */
.dropdown-menu {
    border: 1px solid var(--oth-border-soft);
    box-shadow: var(--ds-shadow-3);
    border-radius: var(--ds-radius-2);
    padding: 0.4rem 0;
}
.dropdown-item {
    padding: 0.5rem 0.9rem;
    font-size: 0.9rem;
    transition: background-color 0.12s var(--ds-ease);
}
.dropdown-item:hover {
    background: var(--oth-light);
    color: var(--oth-black);
}
.dropdown-item:focus-visible {
    background: var(--oth-light);
    outline: none;
}

/* ===== Modal raffinato ===== */
.modal-content {
    border: 1px solid var(--oth-border-soft);
    border-radius: var(--ds-radius-3);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.18);
}
.modal-header { border-bottom-color: var(--oth-border-soft); }
.modal-footer { border-top-color: var(--oth-border-soft); }

/* ============================================================
 * HERO BANNER (saluto + status one-glance)
 * ============================================================ */
.ds-hero {
    background: linear-gradient(180deg, var(--oth-light) 0%, #fff 100%);
    border: 1px solid var(--oth-border-soft);
    border-radius: var(--ds-radius-3);
    padding: 1.6rem 1.8rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--ds-shadow-1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}
.ds-hero-text { flex: 1 1 auto; min-width: 0; }
.ds-hero-eyebrow {
    font-size: 0.78rem;
    color: var(--oth-gray-fg-strong);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}
.ds-hero-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--oth-black);
    margin: 0.2rem 0 0.15rem;
    letter-spacing: -0.012em;
    line-height: 1.2;
}
.ds-hero-sub {
    color: var(--oth-gray-fg-strong);
    font-size: 0.9rem;
    margin: 0;
}
.ds-hero-aside {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    align-items: center;
}

/* ============================================================
 * STATUS PILL (dot + label, dot pulsante per pending)
 * ============================================================ */
.ds-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.22rem 0.65rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 500;
    line-height: 1;
    border: 1px solid transparent;
    background: #fff;
    color: var(--oth-black);
}
.ds-pill::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
    flex: 0 0 auto;
}
.ds-pill-success { background: #e8f5ed; color: var(--status-success); border-color: #c9e7d4; }
.ds-pill-warning { background: #fcf2db; color: var(--status-warning); border-color: #f0d99c; }
.ds-pill-danger  { background: #fbe9e7; color: var(--status-danger);  border-color: #f0c2bc; }
.ds-pill-info    { background: #e6f0fa; color: var(--oth-blue);       border-color: #b9d4ee; }
.ds-pill-muted   { background: var(--oth-light); color: var(--oth-gray-fg-strong); border-color: var(--oth-border-soft); }
/* pulse dot per stato "in attesa" (warning/info) */
.ds-pill-pending::before {
    animation: ds-pulse 1.6s var(--ds-ease-out) infinite;
}
@keyframes ds-pulse {
    0%   { box-shadow: 0 0 0 0 currentColor; opacity: 1; }
    70%  { box-shadow: 0 0 0 5px transparent; opacity: 0.6; }
    100% { box-shadow: 0 0 0 0 transparent; opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
    .ds-pill-pending::before { animation: none; }
}

/* ============================================================
 * SKELETON loader (shimmer) — per sezioni async
 * ============================================================ */
.ds-skeleton {
    display: block;
    border-radius: var(--ds-radius-1);
    background: linear-gradient(90deg, #ececec 0%, #f5f5f5 50%, #ececec 100%);
    background-size: 200% 100%;
    animation: ds-shimmer 1.4s linear infinite;
    color: transparent !important;
    user-select: none;
}
.ds-skeleton.is-text   { height: 0.85em; margin: 0.3em 0; }
.ds-skeleton.is-title  { height: 1.4em; width: 50%; margin: 0.35em 0; }
.ds-skeleton.is-block  { height: 3rem; width: 100%; }
.ds-skeleton.is-circle { width: 36px; height: 36px; border-radius: 50%; }
@keyframes ds-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
@media (prefers-reduced-motion: reduce) {
    .ds-skeleton { animation: none; background: #ececec; }
}

/* ============================================================
 * KPI tile micro-trend (sparkline placeholder + delta)
 * ============================================================ */
.ds-kpi-delta {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.12rem 0.4rem;
    border-radius: var(--ds-radius-1);
    margin-left: 0.35rem;
    vertical-align: middle;
}
.ds-kpi-delta.up   { color: var(--status-success); background: #e8f5ed; }
.ds-kpi-delta.down { color: var(--status-danger);  background: #fbe9e7; }
.ds-kpi-delta.flat { color: var(--oth-gray-fg-strong); background: var(--oth-light); }

/* ============================================================
 * Spinner branded OTH (mini, per inline)
 * ============================================================ */
.ds-spinner {
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid var(--oth-border-strong);
    border-top-color: var(--oth-blue);
    border-radius: 50%;
    animation: ds-spin 0.8s linear infinite;
    vertical-align: -0.15em;
}
.ds-spinner.lg { width: 2.5rem; height: 2.5rem; border-width: 3px; }
@keyframes ds-spin {
    to { transform: rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
    .ds-spinner { animation: none; }
}

/* Empty state icon SVG sizing */
.empty-state-oth .empty-icon img {
    width: 72px;
    height: 72px;
}

/* ===== Print: niente shadow/transform per non sprecare ink ===== */
@media print {
    .card, .ds-kpi, .empty-state-oth, .ds-hero {
        box-shadow: none !important;
        transform: none !important;
        border-color: #ccc !important;
    }
    .ds-skeleton, .ds-spinner { display: none !important; }
}