/* ==========================================================================
   Istituto Musicale M° Luca Corriero — Design System
   ========================================================================== */

:root {
  /* Brand colors */
  --rosso: #C8102E;
  --rosso-scuro: #9A0C22;
  --rosso-chiaro: #F6E3E6;
  --nero: #181818;
  --bianco: #FFFFFF;

  /* Neutrals */
  --grigio-900: #1F1F1F;
  --grigio-700: #4A4A4A;
  --grigio-500: #767676;
  --grigio-300: #D8D3D0;
  --grigio-100: #F5F1EF;
  --panna: #FBF8F6;

  /* Typography */
  --font-titoli: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-accento: 'Cormorant Garamond', 'Playfair Display', serif;
  --font-corpo: 'Source Sans 3', 'Segoe UI', Arial, sans-serif;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  /* Shape / shadow */
  --radius: 10px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(24, 24, 24, 0.08);
  --shadow-md: 0 8px 30px rgba(24, 24, 24, 0.12);
  --shadow-lg: 0 20px 60px rgba(24, 24, 24, 0.18);

  --container-w: 1180px;
  --transition: 0.25s ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; }

body {
  font-family: var(--font-corpo);
  color: var(--grigio-900);
  background: var(--bianco);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-titoli);
  color: var(--nero);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); }
h3 { font-size: clamp(1.3rem, 2.4vw, 1.6rem); }

p { color: var(--grigio-700); }

.accento {
  font-family: var(--font-accento);
  font-style: italic;
  color: var(--rosso);
}

:focus-visible {
  outline: 3px solid var(--rosso);
  outline-offset: 3px;
}

/* ---------- Layout helpers ---------- */
.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section {
  padding-block: var(--space-6);
}

.section--panna { background: var(--panna); }
.section--nero { background: var(--nero); color: var(--bianco); }
.section--nero h2, .section--nero h3 { color: var(--bianco); }
.section--nero p { color: rgba(255,255,255,0.75); }

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-5);
}

.section-head .eyebrow {
  display: inline-block;
  font-family: var(--font-corpo);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rosso);
  margin-bottom: var(--space-1);
}

.grid {
  display: grid;
  gap: var(--space-3);
}

.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: 960px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.9rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 2px solid transparent;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--rosso);
  color: var(--bianco);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover { background: var(--rosso-scuro); }

.btn--outline {
  background: transparent;
  border-color: currentColor;
  color: inherit;
}
.btn--outline:hover { background: rgba(255,255,255,0.1); }

.btn--outline-rosso {
  background: transparent;
  border-color: var(--rosso);
  color: var(--rosso);
}
.btn--outline-rosso:hover { background: var(--rosso); color: var(--bianco); }

.btn-row {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bianco);
  border-bottom: 1px solid var(--grigio-300);
  transition: box-shadow var(--transition);
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.9rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.brand__logo { width: 46px; height: 46px; flex-shrink: 0; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__title {
  font-family: var(--font-titoli);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--nero);
  letter-spacing: 0.01em;
}
.brand__subtitle {
  font-family: var(--font-accento);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--rosso);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.nav__list {
  display: flex;
  gap: var(--space-3);
}
.nav__list a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--grigio-900);
  position: relative;
  padding-block: 0.3rem;
}
.nav__list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--rosso);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}
.nav__list a:hover::after,
.nav__list a[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}
.nav__list a[aria-current="page"] { color: var(--rosso); }

.nav__toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.4rem;
}
.nav__toggle span, .nav__toggle::before, .nav__toggle::after {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  background: var(--nero);
  margin: 6px 0;
  transition: transform var(--transition), opacity var(--transition);
}

@media (max-width: 860px) {
  .nav__toggle { display: block; }
  .nav__list {
    position: fixed;
    inset: 74px 0 0 0;
    background: var(--bianco);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    transform: translateY(-110%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
    z-index: 200;
  }
  .nav__list.is-open { transform: translateY(0); opacity: 1; }
  .nav__list a { font-size: 1.3rem; }
  .nav__cta { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--nero);
}
.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(24,24,24,0.55) 0%, rgba(24,24,24,0.55) 40%, rgba(24,24,24,0.9) 100%),
              linear-gradient(90deg, rgba(24,24,24,0.85) 0%, rgba(24,24,24,0.3) 65%);
}
.hero__content {
  position: relative;
  z-index: 2;
  color: var(--bianco);
  max-width: 720px;
  padding-block: var(--space-6);
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rosso-chiaro);
  background: rgba(200,16,46,0.25);
  border: 1px solid rgba(200,16,46,0.6);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  margin-bottom: var(--space-3);
}
.hero__title { color: var(--bianco); margin-bottom: var(--space-2); }
.hero__subtitle {
  font-family: var(--font-accento);
  font-style: italic;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  color: var(--rosso-chiaro);
  margin-bottom: var(--space-2);
}
.hero__lead {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--space-4);
  max-width: 560px;
}

/* ---------- Badge strip (Carta Etica) ---------- */
.badge-strip {
  background: var(--grigio-100);
  border-top: 1px solid var(--grigio-300);
  border-bottom: 1px solid var(--grigio-300);
  padding-block: var(--space-3);
}
.badge-strip__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  text-align: center;
}
.badge-strip img { height: 54px; width: auto; }
.badge-strip p { font-size: 0.92rem; color: var(--grigio-700); max-width: 640px; }
.badge-strip strong { color: var(--nero); }

/* ---------- Cards ---------- */
.card {
  background: var(--bianco);
  border: 1px solid var(--grigio-300);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  height: 100%;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.card__icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--rosso-chiaro);
  color: var(--rosso);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2);
  font-size: 1.4rem;
}
.card h3 { margin-bottom: 0.5rem; }
.card p { font-size: 0.96rem; margin: 0; }

.card--dark {
  background: var(--grigio-900);
  border-color: var(--grigio-900);
  color: var(--bianco);
}
.card--dark h3 { color: var(--bianco); }
.card--dark p { color: rgba(255,255,255,0.7); }

/* ---------- Photo feature ---------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: center;
}
.feature__media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
}
.feature--reverse .feature__media { order: 2; }
@media (max-width: 860px) {
  .feature, .feature--reverse .feature__media { grid-template-columns: 1fr; order: initial; }
}

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  text-align: center;
}
.stats strong {
  display: block;
  font-family: var(--font-titoli);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--rosso);
}
.stats span { font-size: 0.9rem; color: var(--grigio-500); }
@media (max-width: 700px) { .stats { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); } }

/* ---------- Gallery ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}
.gallery-grid__item {
  overflow: hidden;
  border-radius: var(--radius);
  cursor: pointer;
  position: relative;
  aspect-ratio: 4/5;
}
.gallery-grid__item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s ease;
}
.gallery-grid__item:hover img { transform: scale(1.08); }
@media (max-width: 860px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .gallery-grid { grid-template-columns: 1fr; } }

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10,10,10,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: var(--space-3);
}
.lightbox.is-open { display: flex; }
.lightbox img { max-width: min(90vw, 900px); max-height: 85vh; border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.lightbox__close {
  position: absolute;
  top: var(--space-2); right: var(--space-3);
  color: var(--bianco);
  background: rgba(255,255,255,0.12);
  border: none;
  width: 46px; height: 46px; border-radius: 50%;
  font-size: 1.4rem;
}
.lightbox__nav {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.12);
  color: var(--bianco);
  border: none;
  width: 50px; height: 50px; border-radius: 50%;
  font-size: 1.4rem;
}
.lightbox__nav--prev { left: var(--space-2); }
.lightbox__nav--next { right: var(--space-2); }

/* ---------- Video ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.video-frame {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
@media (max-width: 780px) { .video-grid { grid-template-columns: 1fr; } }

/* Channel preview card (link-out, no iframe dependency) */
.channel-card {
  position: relative;
  display: block;
  aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  isolation: isolate;
}
.channel-card img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.channel-card:hover img { transform: scale(1.06); }
.channel-card::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(24,24,24,0.15), rgba(24,24,24,0.85));
  z-index: 1;
}
.channel-card__content {
  position: absolute; inset: 0; z-index: 2;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: var(--space-3);
  color: var(--bianco);
}
.channel-card__eyebrow {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--rosso-chiaro); margin-bottom: 0.3rem;
}
.channel-card__title { font-family: var(--font-titoli); font-size: 1.4rem; margin-bottom: 0.6rem; }
.channel-card__play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 64px; height: 64px; border-radius: 50%;
  background: rgba(200,16,46,0.92);
  display: flex; align-items: center; justify-content: center;
  z-index: 2;
  transition: transform var(--transition);
}
.channel-card:hover .channel-card__play { transform: translate(-50%,-50%) scale(1.1); }
.channel-card__cta {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-weight: 600; font-size: 0.92rem;
  color: var(--bianco);
}

/* ---------- Forms ---------- */
.form {
  display: grid;
  gap: var(--space-2);
}
.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}
@media (max-width: 620px) { .form__row { grid-template-columns: 1fr; } }

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--grigio-900);
}
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1.5px solid var(--grigio-300);
  border-radius: 8px;
  background: var(--bianco);
  transition: border-color var(--transition);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--rosso);
  outline: none;
}
.field textarea { min-height: 130px; resize: vertical; }
.field--check { display: flex; align-items: flex-start; gap: 0.6rem; }
.field--check input { width: auto; margin-top: 0.3rem; }
.field--check label { font-weight: 400; font-size: 0.85rem; color: var(--grigio-700); }

.form-note { font-size: 0.85rem; color: var(--grigio-500); }
.form-success {
  display: none;
  background: #E8F5E9;
  border: 1px solid #A5D6A7;
  color: #256029;
  padding: var(--space-2);
  border-radius: var(--radius);
}

/* ---------- Contact info blocks ---------- */
.info-list { display: grid; gap: var(--space-2); }
.info-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding-block: var(--space-2);
  border-bottom: 1px solid var(--grigio-300);
}
.info-item__icon {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--rosso-chiaro); color: var(--rosso);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.info-item h4 { font-family: var(--font-corpo); font-size: 0.95rem; margin-bottom: 0.2rem; }
.info-item p { margin: 0; font-size: 0.92rem; }
.info-item a:hover { color: var(--rosso); }

.map-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  aspect-ratio: 4/3;
}
.map-frame iframe { width: 100%; height: 100%; border: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--nero);
  color: rgba(255,255,255,0.75);
  padding-block: var(--space-5) var(--space-3);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.footer-grid h4 {
  color: var(--bianco);
  font-family: var(--font-corpo);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.footer-grid ul { display: grid; gap: 0.6rem; }
.footer-grid a:hover { color: var(--bianco); }
.footer-brand { display: flex; align-items: center; gap: 0.7rem; margin-bottom: var(--space-2); }
.footer-brand img { width: 42px; height: 42px; }
.footer-brand span { font-family: var(--font-titoli); color: var(--bianco); font-size: 1.1rem; }
.footer-social { display: flex; gap: 0.8rem; margin-top: var(--space-2); }
.footer-social a {
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
}
.footer-social a:hover { background: var(--rosso); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: var(--space-3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
}
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Page hero (interior pages) ---------- */
.page-hero {
  background: var(--nero);
  color: var(--bianco);
  padding-block: var(--space-5);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(200,16,46,0.25), transparent 55%);
}
.page-hero__inner { position: relative; z-index: 1; }
.page-hero h1 { color: var(--bianco); }
.page-hero p { color: rgba(255,255,255,0.75); max-width: 620px; margin-inline: auto; }
.breadcrumb {
  font-size: 0.85rem;
  color: var(--rosso-chiaro);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2);
}

/* ---------- Course list ---------- */
.course-block {
  border: 1px solid var(--grigio-300);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
}
.course-block h3 { color: var(--rosso); margin-bottom: 0.6rem; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.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;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--rosso);
  color: var(--bianco);
  padding: 0.8rem 1.2rem;
  z-index: 999;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- WhatsApp floating button ---------- */
.whatsapp-float {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 150;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #25D366;
  color: var(--bianco);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition);
}
.whatsapp-float:hover { transform: scale(1.08); }

/* ---------- FAQ ---------- */
.faq {
  display: grid;
  gap: var(--space-2);
  max-width: 780px;
  margin-inline: auto;
}
.faq-item {
  border: 1px solid var(--grigio-300);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bianco);
}
.faq-item summary {
  padding: 1.1rem 1.4rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--rosso);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
  padding: 0 1.4rem 1.2rem;
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- Cookie banner ---------- */
.cookie-banner {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 300;
  background: var(--nero);
  color: rgba(255,255,255,0.9);
  padding: 1rem var(--space-3);
  display: none;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
}
.cookie-banner.is-visible { display: flex; }
.cookie-banner p {
  margin: 0;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.85);
  max-width: 760px;
}
.cookie-banner p a { color: var(--bianco); text-decoration: underline; }
.cookie-banner .btn { flex-shrink: 0; padding: 0.7rem 1.5rem; font-size: 0.9rem; }