/*
 * SportApp — Design System
 * File: resources/css/app.css
 *
 * Questo file definisce l'intero sistema di design della piattaforma.
 * - Variabili CSS (colori, font, spacing, border-radius...)
 * - Reset e base
 * - Componenti riutilizzabili (card, button, form, badge...)
 * - Layout (nav, sidebar, main content)
 * - Utility classes
 *
 * Per modificare un colore o uno stile globale, cambia le variabili
 * nella sezione :root e si propagherà ovunque automaticamente.
 *
 * FONT: Inter da Google Fonts (caricato nel layout base)
 */

/* ========================================================================
   1. VARIABILI CSS — Design Tokens
   ======================================================================== */
:root {
    /* -- PALETTE HOOP -- */
    --hoop-cream:    #FFF9F6;
    --hoop-blush:    #FFEDE5;
    --hoop-orange:   #F78B43;
    --hoop-sienna:   #B85B26;
    --hoop-charcoal: #221E22;

    /* -- COLORI PRINCIPALI -- */
    --color-primary:       #F78B43;   /* Arancio Hoop — bottoni, link, accenti */
    --color-primary-dark:  #B85B26;   /* Sienna — hover state */
    --color-primary-light: #F9A56C;   /* Arancio chiaro — highlights */
    --color-secondary:     #B85B26;   /* Sienna — accenti secondari */
    --color-accent:        #43C97B;   /* Verde — successo, completato */
    --color-accent-dark:   #38B96A;

    /* -- COLORI SFONDO (tema chiaro Hoop) -- */
    --color-bg:            #FFF9F6;   /* Cream — sfondo principale pagina */
    --color-surface:       #FFFFFF;   /* Bianco — sfondo card e aree secondarie */
    --color-card:          #FFFFFF;   /* Sfondo card */
    --color-card-hover:    #FFF5EF;   /* Card hover — blush leggero */
    --color-border:        #F0E4DC;   /* Bordi card/input — beige caldo */
    --color-border-light:  #FFEDE5;   /* Bordi leggeri — blush */

    /* -- COLORI TESTO -- */
    --color-text:          #221E22;   /* Charcoal — testo principale */
    --color-text-muted:    #8A7F7A;   /* Grigio caldo — testo secondario */
    --color-text-disabled: #C4BAB5;
    --color-heading:       #221E22;   /* Charcoal — titoli */

    /* -- COLORI STATO -- */
    --color-success:    #43C97B;
    --color-warning:    #F7971E;
    --color-danger:     #E74C3C;
    --color-info:       #3498DB;

    /* -- COLORI TIPI SESSIONE -- */
    --type-workout:        #F78B43;
    --type-cardio:         #43C97B;
    --type-diet:           #F7971E;
    --type-psychology:     #E74C3C;
    --type-physiotherapy:  #3498DB;
    --type-rest:           #95A5A6;
    --type-appointment:    #9B59B6;

    /* -- TIPOGRAFIA -- */
    --font-family:         'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs:        0.75rem;    /* 12px */
    --font-size-sm:        0.875rem;   /* 14px */
    --font-size-base:      1rem;       /* 16px */
    --font-size-lg:        1.125rem;   /* 18px */
    --font-size-xl:        1.25rem;    /* 20px */
    --font-size-2xl:       1.5rem;     /* 24px */
    --font-size-3xl:       1.875rem;   /* 30px */
    --font-size-4xl:       2.25rem;    /* 36px */
    --font-weight-normal:  400;
    --font-weight-medium:  500;
    --font-weight-semibold:600;
    --font-weight-bold:    700;

    /* -- SPACING -- */
    --space-1:  0.25rem;   /* 4px */
    --space-2:  0.5rem;    /* 8px */
    --space-3:  0.75rem;   /* 12px */
    --space-4:  1rem;      /* 16px */
    --space-5:  1.25rem;   /* 20px */
    --space-6:  1.5rem;    /* 24px */
    --space-8:  2rem;      /* 32px */
    --space-10: 2.5rem;    /* 40px */
    --space-12: 3rem;      /* 48px */
    --space-16: 4rem;      /* 64px */

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

    /* -- OMBRE -- */
    --shadow-sm:   0 1px 3px rgba(34,30,34,0.06);
    --shadow-md:   0 4px 16px rgba(34,30,34,0.08);
    --shadow-lg:   0 8px 32px rgba(34,30,34,0.12);
    --shadow-glow: 0 0 20px rgba(247,139,67,0.25);

    /* -- TRANSIZIONI -- */
    --transition-fast:   0.15s ease;
    --transition-base:   0.2s ease;
    --transition-slow:   0.35s ease;

    /* -- LAYOUT -- */
    --sidebar-width:     260px;
    --topnav-height:     64px;
    --content-max-width: 1280px;
}

/* ========================================================================
   2. RESET & BASE
   ======================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary); }

img, video { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
    color: var(--color-heading);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
}

/* ========================================================================
   3. LAYOUT PRINCIPALE
   ======================================================================== */

/* Body con sidebar laterale (per utenti loggati) */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* -- SIDEBAR -- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-slow);
    overflow-y: auto;
}

.sidebar__logo {
    padding: var(--space-6) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sidebar__logo-icon {
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.sidebar__logo-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-heading);
}

.sidebar__nav {
    padding: var(--space-4) var(--space-3);
    flex: 1;
}

.sidebar__section-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-disabled);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: var(--space-4) var(--space-3) var(--space-2);
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    margin-bottom: 2px;
}
.sidebar__link:hover {
    background: var(--color-card);
    color: var(--color-text);
}
.sidebar__link.active {
    background: rgba(108, 99, 255, 0.15);
    color: var(--color-primary-light);
    font-weight: var(--font-weight-semibold);
}
.sidebar__link .icon {
    width: 20px;
    text-align: center;
    font-size: 16px;
    flex-shrink: 0;
}

/* Badge notifiche nella sidebar */
.sidebar__badge {
    margin-left: auto;
    background: var(--color-secondary);
    color: white;
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    padding: 1px 6px;
    border-radius: var(--radius-full);
    min-width: 18px;
    text-align: center;
}

.sidebar__footer {
    padding: var(--space-4) var(--space-3);
    border-top: 1px solid var(--color-border);
}

.sidebar__user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}
.sidebar__user:hover { background: var(--color-card); }

.sidebar__avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--color-primary);
}

.sidebar__user-info {
    flex: 1;
    min-width: 0;
}
.sidebar__user-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sidebar__user-role {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* -- CONTENUTO PRINCIPALE -- */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-5) var(--space-8);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-heading);
}

.page-body {
    padding: var(--space-8);
    flex: 1;
}

/* ========================================================================
   4. COMPONENTI — Card
   ======================================================================== */
.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.card:hover {
    border-color: var(--color-border-light);
    box-shadow: var(--shadow-md);
}

.card--glass {
    background: rgba(22, 33, 62, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.08);
}

.card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}
.card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
}

/* ========================================================================
   5. COMPONENTI — Button
   ======================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.6rem 1.25rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn--primary {
    background: var(--color-primary);
    color: white;
}
.btn--primary:hover { background: var(--color-primary-dark); color: white; box-shadow: var(--shadow-glow); }

.btn--secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}
.btn--secondary:hover { background: var(--color-card-hover); color: var(--color-text); }

.btn--danger {
    background: var(--color-danger);
    color: white;
}
.btn--danger:hover { background: #e0506e; color: white; }

.btn--success {
    background: var(--color-success);
    color: #0F0F1A;
}
.btn--success:hover { background: var(--color-accent-dark); color: #0F0F1A; }

.btn--ghost {
    background: transparent;
    color: var(--color-text-muted);
}
.btn--ghost:hover { background: var(--color-card); color: var(--color-text); }

.btn--sm { padding: 0.4rem 0.875rem; font-size: var(--font-size-xs); }
.btn--lg { padding: 0.8rem 1.75rem; font-size: var(--font-size-base); }
.btn--block { width: 100%; }

.btn--icon {
    width: 36px; height: 36px;
    padding: 0;
    border-radius: var(--radius-md);
}

/* ========================================================================
   6. COMPONENTI — Form
   ======================================================================== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}

.form-control {
    width: 100%;
    padding: 0.625rem var(--space-4);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}
.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.2);
}
.form-control::placeholder {
    color: var(--color-text-disabled);
}

.form-control--error {
    border-color: var(--color-danger);
}
.form-control--error:focus {
    box-shadow: 0 0 0 3px rgba(255, 101, 132, 0.2);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--color-danger);
    margin-top: var(--space-1);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%238888AA' d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 12px;
    padding-right: 36px;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* ========================================================================
   7. COMPONENTI — Badge
   ======================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0.2rem 0.6rem;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
}
.badge--primary  { background: rgba(108, 99, 255, 0.15); color: var(--color-primary-light); }
.badge--success  { background: rgba(67, 233, 123, 0.15); color: var(--color-success); }
.badge--warning  { background: rgba(247, 151, 30, 0.15);  color: var(--color-warning); }
.badge--danger   { background: rgba(255, 101, 132, 0.15); color: var(--color-danger); }
.badge--muted    { background: var(--color-border);        color: var(--color-text-muted); }

/* ========================================================================
   8. COMPONENTI — Alert / Flash Messages
   ======================================================================== */
.alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    border-left: 4px solid;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}
.alert--success { background: rgba(67,233,123,0.1); border-color: var(--color-success); color: #7BFAAA; }
.alert--error   { background: rgba(255,101,132,0.1); border-color: var(--color-danger); color: #FF8FAB; }
.alert--warning { background: rgba(247,151,30,0.1); border-color: var(--color-warning); color: #FFBA68; }
.alert--info    { background: rgba(86,204,242,0.1); border-color: var(--color-info); color: #8ADCF5; }

/* ========================================================================
   9. COMPONENTI — Workout Cards (Calendario)
   ======================================================================== */
.workout-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}
.workout-card::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    border-radius: 0 0 0 var(--radius-md);
}
/* Colori bordo sinistro per tipo sessione */
.workout-card--workout::before      { background: var(--type-workout); }
.workout-card--cardio::before       { background: var(--type-cardio); }
.workout-card--diet::before         { background: var(--type-diet); }
.workout-card--psychology::before   { background: var(--type-psychology); }
.workout-card--physiotherapy::before { background: var(--type-physiotherapy); }
.workout-card--rest::before         { background: var(--type-rest); }
.workout-card--appointment::before  { background: var(--type-appointment); }

.workout-card:hover {
    border-color: var(--color-border-light);
    background: var(--color-card-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.workout-card__type-icon { font-size: 13px; margin-bottom: var(--space-1); }
.workout-card__title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
    line-height: 1.3;
    margin-bottom: var(--space-1);
}
.workout-card__meta {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}
.workout-card__summary {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================================================
   10. COMPONENTI — Feeling Rating (Feedback)
   ======================================================================== */
.feeling-rating {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}
.feeling-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
}
.feeling-btn:hover,
.feeling-btn.selected {
    border-color: var(--color-primary);
    background: rgba(108, 99, 255, 0.1);
    transform: scale(1.05);
}
.feeling-btn span {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* RPE Slider */
.rpe-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: linear-gradient(to right, #43E97B, #F7971E, #FF6584);
    outline: none;
    cursor: pointer;
}
.rpe-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px; height: 20px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--color-primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}
.rpe-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* ========================================================================
   11. LAYOUT AUTH (Login / Register)
   ======================================================================== */
.auth-layout {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    /* Sfondo con pattern puntini */
    background-image: radial-gradient(circle at 1px 1px, rgba(247,139,67,0.1) 1px, transparent 0);
    background-size: 40px 40px;
    padding: var(--space-8) var(--space-4);
}

.auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-10) var(--space-8);
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: var(--space-8);
}
.auth-logo__icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-lg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: var(--space-3);
    box-shadow: var(--shadow-glow);
}
.auth-logo__name {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-heading);
}
.auth-logo__tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.auth-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-heading);
    margin-bottom: var(--space-1);
}
.auth-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.auth-divider {
    text-align: center;
    margin: var(--space-5) 0;
    position: relative;
    color: var(--color-text-disabled);
    font-size: var(--font-size-xs);
}
.auth-divider::before, .auth-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: var(--color-border);
}
.auth-divider::before { left: 0; }
.auth-divider::after  { right: 0; }

/* ========================================================================
   12. RESPONSIVE — Mobile
   ======================================================================== */

/* Bottom navigation bar per mobile (stile app) */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0; right: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-2) 0;
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom);
}
.bottom-nav__items {
    display: flex;
    justify-content: space-around;
    align-items: center;
}
.bottom-nav__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: var(--space-2) var(--space-4);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast);
}
.bottom-nav__item.active { color: var(--color-primary-light); }
.bottom-nav__item .icon { font-size: 22px; }

/* Hamburger per sidebar su mobile */
.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    font-size: 22px;
    padding: var(--space-2);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    .main-content {
        margin-left: 0;
        padding-bottom: 80px;  /* Spazio per bottom nav */
    }
    .bottom-nav {
        display: block;
    }
    .sidebar-toggle {
        display: flex;
    }
    .page-body {
        padding: var(--space-4);
    }
    .page-header {
        padding: var(--space-4) var(--space-5);
    }
}

/* ========================================================================
   13. UTILITY CLASSES
   ======================================================================== */
.text-center   { text-align: center; }
.text-right    { text-align: right; }
.text-muted    { color: var(--color-text-muted); }
.text-sm       { font-size: var(--font-size-sm); }
.text-xs       { font-size: var(--font-size-xs); }
.text-lg       { font-size: var(--font-size-lg); }
.text-primary  { color: var(--color-primary-light); }
.text-success  { color: var(--color-success); }
.text-danger   { color: var(--color-danger); }
.text-warning  { color: var(--color-warning); }
.fw-bold       { font-weight: var(--font-weight-bold); }
.fw-semibold   { font-weight: var(--font-weight-semibold); }

.d-flex        { display: flex; }
.align-center  { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1         { gap: var(--space-1); }
.gap-2         { gap: var(--space-2); }
.gap-3         { gap: var(--space-3); }
.gap-4         { gap: var(--space-4); }
.flex-1        { flex: 1; }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.w-full  { width: 100%; }
.hidden  { display: none; }

/* Griglia responsive */
.grid { display: grid; gap: var(--space-4); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) {
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* Micro-animazione: fade in per gli elementi che appaiono */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
    animation: fadeIn 0.3s ease forwards;
}

/* Spinner di caricamento */
@keyframes spin {
    to { transform: rotate(360deg); }
}
.spinner {
    width: 20px; height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}