/* ============================================================================
   QWERTY — Shared Stylesheet
   Serves: init.html, quiz/index.html, gestione/index.html
   ============================================================================ */

/* ============ Custom Properties ============ */
:root {
    /* Brand colors — matching backend Excel header (#2F5496) */
    --color-primary:        #2F5496;
    --color-primary-dark:   #1E3A6E;
    --color-primary-light:  #4472C4;

    /* Semantic colors */
    --color-correct:        #217346;
    --color-correct-bg:     #E8F5E9;
    --color-error:          #C0392B;
    --color-error-bg:       #FDECEA;
    --color-warning:        #D68910;
    --color-warning-bg:     #FEF9E7;

    /* Neutrals */
    --color-bg:             #F5F7FA;
    --color-surface:        #FFFFFF;
    --color-border:         #DEE2E6;
    --color-text:           #212529;
    --color-text-muted:     #6C757D;
    --color-disabled:       #ADB5BD;
    --color-disabled-bg:    #E9ECEF;

    /* Spacing scale */
    --space-xs:  0.25rem;
    --space-sm:  0.5rem;
    --space-md:  1rem;
    --space-lg:  1.5rem;
    --space-xl:  2rem;
    --space-2xl: 3rem;

    /* Typography */
    --font-family:    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --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:  2rem;

    /* Borders & Shadows */
    --radius-sm:      4px;
    --radius-md:      8px;
    --radius-lg:      12px;
    --radius-full:    9999px;
    --shadow-sm:      0 1px 3px rgba(0,0,0,0.08);
    --shadow-md:      0 4px 12px rgba(0,0,0,0.12);
    --shadow-lg:      0 8px 24px rgba(0,0,0,0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
}

/* ============ Reset ============ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============ Layout ============ */
.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--space-md) var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
}

.page-header__logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.page-header__subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.page-main {
    flex: 1;
    padding: var(--space-xl);
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

/* Center layout for single-card pages (login, etc.) */
.page-main--centered {
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-footer {
    background-color: var(--color-primary-dark);
    color: rgba(255,255,255,0.6);
    text-align: center;
    padding: var(--space-sm) var(--space-xl);
    font-size: var(--font-size-sm);
}

/* ============ Card ============ */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.card--wide {
    width: 100%;
}

.card--narrow {
    max-width: 420px;
    width: 100%;
}

.card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-border);
}

/* ============ Forms ============ */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}

.form-input {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(68, 114, 196, 0.2);
}

.form-input--code {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: var(--font-size-xl);
    text-align: center;
    font-weight: 700;
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), opacity var(--transition-fast), transform var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:active:not(:disabled) {
    transform: translateY(1px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn--primary {
    background-color: var(--color-primary);
    color: #fff;
}

.btn--primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
}

.btn--secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn--secondary:hover:not(:disabled) {
    background-color: rgba(47, 84, 150, 0.08);
}

.btn--danger {
    background-color: var(--color-error);
    color: #fff;
}

.btn--danger:hover:not(:disabled) {
    background-color: #A93226;
}

.btn--success {
    background-color: var(--color-correct);
    color: #fff;
}

.btn--success:hover:not(:disabled) {
    background-color: #1A5C38;
}

.btn--block {
    width: 100%;
}

.btn--lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-lg);
}

/* ============ Answer Options (quiz) ============ */
.options-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.option-btn {
    width: 100%;
    text-align: left;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    font-weight: 500;
    color: var(--color-text);
}

.option-btn:hover:not(:disabled) {
    border-color: var(--color-primary-light);
    background-color: #EFF3FB;
}

.option-btn:focus-visible {
    outline: 3px solid var(--color-primary-light);
    outline-offset: 2px;
}

.option-btn--correct {
    border-color: var(--color-correct);
    background-color: var(--color-correct-bg);
    color: var(--color-correct);
}

.option-btn--wrong {
    border-color: var(--color-error);
    background-color: var(--color-error-bg);
    color: var(--color-error);
}

.option-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    background-color: var(--color-disabled-bg);
    color: var(--color-disabled);
    border-color: var(--color-border);
}

.option-btn--wrong:disabled {
    opacity: 0.6;
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border-color: var(--color-error);
}

/* ============ Feedback messages ============ */
.feedback {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    display: none;
}

.feedback.is-visible {
    display: block;
}

.feedback--error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid rgba(192, 57, 43, 0.3);
}

.feedback--success {
    background-color: var(--color-correct-bg);
    color: var(--color-correct);
    border: 1px solid rgba(33, 115, 70, 0.3);
}

.feedback--warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid rgba(214, 137, 16, 0.3);
}

.feedback--info {
    background-color: #EFF3FB;
    color: var(--color-primary);
    border: 1px solid rgba(47, 84, 150, 0.3);
}

/* ============ Progress bar ============ */
.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

/* ============ Badge ============ */
.badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge--draft            { background: #E9ECEF; color: var(--color-text-muted); }
.badge--codes-generated  { background: #FEF9E7; color: var(--color-warning); }
.badge--active           { background: var(--color-correct-bg); color: var(--color-correct); }
.badge--closed           { background: var(--color-error-bg); color: var(--color-error); }

/* ============ Loader spinner ============ */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    flex-shrink: 0;
}

.spinner--dark {
    border-color: rgba(47, 84, 150, 0.3);
    border-top-color: var(--color-primary);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Loading state on buttons */
.btn.is-loading .btn-label  { opacity: 0; }
.btn.is-loading .spinner    { position: absolute; }
.btn { position: relative; }

/* ============ Table ============ */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.data-table th {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    font-weight: 600;
}

.data-table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background-color: #F0F4FB;
}

/* ============ Section header ============ */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary-dark);
}

/* ============ Divider ============ */
.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-lg) 0;
}

/* ============ Responsive ============ */
@media (max-width: 768px) {
    .page-main {
        padding: var(--space-md);
    }

    .page-header {
        padding: var(--space-md);
    }

    .card {
        padding: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .card--narrow {
        max-width: 100%;
    }

    .form-input--code {
        font-size: var(--font-size-lg);
    }
}

/* ============ Management Layout (sidebar + content) ============ */
.mgmt-layout {
    display: flex;
    min-height: 100vh;
}

/* ---- Sidebar ---- */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, var(--color-primary-dark) 0%, #162B50 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition-base);
}

.sidebar__brand {
    padding: var(--space-xl) var(--space-lg);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar__logo {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    letter-spacing: 0.08em;
    display: block;
}

.sidebar__tagline {
    font-size: var(--font-size-sm);
    opacity: 0.6;
    margin-top: var(--space-xs);
    display: block;
}

.sidebar__nav {
    flex: 1;
    padding: var(--space-md) 0;
    overflow-y: auto;
    list-style: none;
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-lg);
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
    margin: 2px 0;
}

.sidebar__link:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

.sidebar__link--active {
    background: rgba(255,255,255,0.12);
    color: #fff;
    border-left-color: #fff;
    font-weight: 700;
}

.sidebar__link-icon {
    font-size: 1.2em;
    width: 1.5em;
    text-align: center;
    flex-shrink: 0;
}

.sidebar__footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.sidebar__user {
    font-size: var(--font-size-sm);
    opacity: 0.6;
    margin-bottom: var(--space-sm);
    display: block;
}

.sidebar__logout-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-md);
    color: rgba(255,255,255,0.8);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.sidebar__logout-btn:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

/* ---- Content area ---- */
.mgmt-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.mgmt-topbar {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-xl);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}

.mgmt-topbar__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary-dark);
}

.mgmt-topbar__spacer { flex: 1; }

.mgmt-hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-xs);
    color: var(--color-primary-dark);
    line-height: 1;
}

.mgmt-body {
    flex: 1;
    padding: var(--space-xl);
    width: 100%;
}

.mgmt-footer {
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    text-align: center;
    padding: var(--space-sm) var(--space-xl);
    font-size: var(--font-size-sm);
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 99;
}

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

/* ---- Stat cards row ---- */
.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

.stat-card__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.stat-card__value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary-dark);
}

/* ---- Quick action grid (dashboard) ---- */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.quick-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xl) var(--space-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}

.quick-action:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: var(--color-primary-light);
}

.quick-action__icon {
    font-size: 2rem;
}

.quick-action__label {
    font-size: var(--font-size-base);
    color: var(--color-primary-dark);
}

/* ---- Responsive: sidebar collapses on mobile ---- */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.is-open {
        transform: translateX(0);
    }

    .mgmt-content {
        margin-left: 0;
    }

    .mgmt-hamburger {
        display: block;
    }

    .mgmt-body {
        padding: var(--space-md);
    }
}