/* ============================================================
   AlloggiStudenti.it - Stile pre-lancio
   Concept: appunti di uno studente. Carta, penna blu,
   evidenziatore giallo. Layered su Bootstrap 5.3.
   ============================================================ */

:root {
    --as-ink: #131c33;
    --as-paper: #fbfaf6;
    --as-marker: #ffe14d;
    --as-marker-soft: #fff3b0;
    --as-pen: #2d4fe3;
    --as-muted: #5b6478;
    --as-line: #e6e3d8;
    --as-radius: 14px;
    --font-display: 'Sora', sans-serif;
    --font-body: 'Instrument Sans', sans-serif;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--as-paper);
    color: var(--as-ink);
    font-size: 1.06rem;
    line-height: 1.65;
}

h1, h2, h3, h4, .navbar-brand {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--as-ink);
}

a { color: var(--as-pen); }

/* ---------- Evidenziatore (elemento firma) ---------- */
.evidenzia {
    position: relative;
    display: inline-block;
    white-space: nowrap;
}
.evidenzia::before {
    content: "";
    position: absolute;
    left: -0.18em;
    right: -0.18em;
    bottom: 0.05em;
    height: 0.55em;
    background: var(--as-marker);
    transform: rotate(-1.2deg);
    border-radius: 3px 6px 4px 5px;
    z-index: -1;
}

/* ---------- Navbar ---------- */
.navbar {
    background: rgba(251, 250, 246, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--as-line);
}
.navbar-brand { font-size: 1.25rem; }
.navbar-brand .dot { color: var(--as-pen); }

.btn-pen {
    background: var(--as-pen);
    color: #fff;
    font-weight: 600;
    border: none;
    border-radius: 999px;
    padding: 0.6rem 1.4rem;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-pen:hover, .btn-pen:focus {
    background: #2342c8;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(45, 79, 227, 0.25);
}

.btn-marker {
    background: var(--as-marker);
    color: var(--as-ink);
    font-weight: 700;
    border: 2px solid var(--as-ink);
    border-radius: 999px;
    padding: 0.65rem 1.6rem;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-marker:hover, .btn-marker:focus {
    background: #ffd91f;
    color: var(--as-ink);
    transform: translateY(-2px);
    box-shadow: 4px 4px 0 var(--as-ink);
}

/* ---------- Hero ---------- */
.hero {
    padding: 5.5rem 0 4rem;
    position: relative;
    overflow: hidden;
}
.hero .badge-lancio {
    background: var(--as-ink);
    color: var(--as-marker);
    font-weight: 600;
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border-radius: 999px;
    padding: 0.45rem 1.1rem;
}
.hero h1 {
    font-size: clamp(2.3rem, 5vw, 3.6rem);
    line-height: 1.12;
    font-weight: 800;
}
.hero .lead {
    color: var(--as-muted);
    max-width: 34rem;
}

/* Carte annuncio inclinate */
.card-stack { position: relative; min-height: 420px; }
.annuncio-card {
    position: absolute;
    width: 270px;
    background: #fff;
    border: 1px solid var(--as-line);
    border-radius: var(--as-radius);
    box-shadow: 0 14px 34px rgba(19, 28, 51, 0.12);
    padding: 1rem;
    transition: transform 0.25s ease;
}
.annuncio-card:hover { transform: rotate(0deg) translateY(-6px) !important; z-index: 5; }
.annuncio-card .foto {
    height: 130px;
    border-radius: 10px;
    margin-bottom: 0.75rem;
}
.annuncio-card .prezzo { font-family: var(--font-display); font-weight: 700; }
.annuncio-card .meta { color: var(--as-muted); font-size: 0.85rem; }
.annuncio-card .tag-verificato {
    background: var(--as-marker-soft);
    color: var(--as-ink);
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: 6px;
    padding: 0.15rem 0.5rem;
}
.card-1 { top: 0; left: 6%; transform: rotate(-4deg); z-index: 3; }
.card-2 { top: 95px; left: 38%; transform: rotate(2.5deg); z-index: 2; }
.card-3 { top: 215px; left: 12%; transform: rotate(-1.5deg); z-index: 1; }

.foto-a { background: linear-gradient(135deg, #ffd5a6, #ff9a62); }
.foto-b { background: linear-gradient(135deg, #b8c9ff, #5d7bf0); }
.foto-c { background: linear-gradient(135deg, #c9efd4, #5fc783); }

/* ---------- Marquee città ---------- */
.citta-strip {
    background: var(--as-ink);
    color: var(--as-paper);
    overflow: hidden;
    padding: 0.85rem 0;
    white-space: nowrap;
}
.citta-strip .track {
    display: inline-block;
    animation: scorri 40s linear infinite;
    font-family: var(--font-display);
    font-size: 0.95rem;
    letter-spacing: 0.04em;
}
.citta-strip .sep { color: var(--as-marker); margin: 0 1.1rem; }
@keyframes scorri {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
    .citta-strip .track { animation: none; }
    html { scroll-behavior: auto; }
}

/* ---------- Sezioni ---------- */
.section { padding: 4.5rem 0; }
.section-alt { background: #fff; border-top: 1px solid var(--as-line); border-bottom: 1px solid var(--as-line); }
.eyebrow {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--as-pen);
}
.section h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin-bottom: 0.6rem; }
.section .intro { color: var(--as-muted); max-width: 42rem; }

.feature-card {
    background: #fff;
    border: 1px solid var(--as-line);
    border-radius: var(--as-radius);
    padding: 1.6rem;
    height: 100%;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 26px rgba(19, 28, 51, 0.08);
}
.feature-card .icona {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: var(--as-marker-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 1rem;
}
.feature-card h3 { font-size: 1.12rem; }
.feature-card p { color: var(--as-muted); font-size: 0.95rem; margin: 0; }

/* Come funziona */
.step-num {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 2.4rem;
    color: var(--as-marker);
    -webkit-text-stroke: 1.5px var(--as-ink);
    line-height: 1;
}

/* ---------- Form waitlist ---------- */
.waitlist-box {
    background: var(--as-ink);
    border-radius: 22px;
    color: var(--as-paper);
    padding: 3rem 2rem;
    position: relative;
    overflow: hidden;
}
.waitlist-box h2 { color: #fff; }
.waitlist-box p { color: #b9c0d4; }
.waitlist-box::after {
    content: "";
    position: absolute;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 225, 77, 0.18), transparent 70%);
    top: -120px;
    right: -80px;
}
.waitlist-box .form-control,
.waitlist-box .form-select {
    border-radius: 10px;
    border: none;
    padding: 0.8rem 1rem;
    font-size: 1rem;
}
.waitlist-box .form-control:focus,
.waitlist-box .form-select:focus {
    box-shadow: 0 0 0 3px rgba(255, 225, 77, 0.55);
}
.honeypot { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* ---------- FAQ ---------- */
.accordion-item { border-color: var(--as-line); }
.accordion-button { font-family: var(--font-display); font-weight: 600; color: var(--as-ink); }
.accordion-button:not(.collapsed) {
    background: var(--as-marker-soft);
    color: var(--as-ink);
    box-shadow: none;
}
.accordion-button:focus { box-shadow: 0 0 0 3px rgba(45, 79, 227, 0.25); }

/* ---------- Footer ---------- */
footer {
    background: var(--as-ink);
    color: #b9c0d4;
    padding: 2.5rem 0;
    font-size: 0.92rem;
}
footer a { color: var(--as-marker); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
    .card-stack { min-height: 380px; margin-top: 2.5rem; }
    .card-1 { left: 0; }
    .card-2 { left: 34%; }
}
@media (max-width: 575.98px) {
    .hero { padding-top: 3.5rem; }
    .annuncio-card { width: 230px; }
    .card-2 { left: 25%; }
}