/* =================================================================
   AI4TEACHER — style.css
   Palette e tipografia riprese dal design originale realizzato con Canva.
   ================================================================= */

:root {
  /* Palette principale (dal sito Canva) */
  --indigo-950: #17133f;
  --indigo-900: #211858;
  --indigo-800: #241a60;
  --indigo-700: #2c2473;
  --indigo-600: #34277d;
  --indigo-500: #42358d;
  --indigo-tint-bg: #f7f5ff;
  --indigo-tint-tag: #e7e1ff;
  --indigo-tint-tag-2: #eeeaff;

  --accent-yellow: #ffd76a;
  --accent-coral: #ff7864;

  --text-on-dark: #ffffff;
  --text-on-dark-soft: #e7e2ff;
  --text-on-dark-muted: #c9c3e8;
  --text-heading: #20194e;
  --text-body: #6a6680;
  --text-link: #5139bf;

  --card-bg: #ffffff;
  --border-soft: rgba(38, 31, 91, 0.12);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", "Segoe UI", Arial, sans-serif;

  --radius-lg: 1.5rem;
  --radius-md: 1rem;
  --radius-full: 999px;

  --shadow-card: 0 18px 40px -20px rgba(33, 24, 88, 0.35);
  --shadow-card-hover: 0 26px 50px -18px rgba(33, 24, 88, 0.45);

  --site-max-width: 1200px;
}

/* --- Reset di base --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-heading);
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; cursor: pointer; }

.site-width {
  width: 100%;
  max-width: var(--site-max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.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 accessibilità */
.skip-link {
  position: absolute;
  left: 1rem; top: -3rem;
  background: var(--accent-yellow);
  color: var(--indigo-800);
  font-weight: 700;
  padding: .6rem 1rem;
  border-radius: var(--radius-md);
  z-index: 100;
  transition: top .2s ease;
}
.skip-link:focus { top: 1rem; }

/* =================================================================
   HEADER
   ================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(27, 20, 76, 0.86);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text-on-dark);
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem; height: 2.2rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-coral), var(--accent-yellow));
  color: var(--indigo-900);
}
.brand-mark svg { width: 1.15rem; height: 1.15rem; }

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-link {
  color: var(--text-on-dark-soft);
  font-weight: 500;
  padding: .4rem 0;
  border-bottom: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.nav-link:hover, .nav-link:focus-visible { color: var(--text-on-dark); border-color: var(--accent-yellow); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  padding: .8rem 1.4rem;
  border: none;
  white-space: nowrap;
  transition: transform .15s ease, box-shadow .15s ease, background .2s ease;
}
.btn svg {
  width: 1.05rem;
  height: 1.05rem;
  flex-shrink: 0;
}
.btn-primary {
  background: var(--accent-yellow);
  color: var(--indigo-800);
}
.btn-primary:hover, .btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -8px rgba(255, 215, 106, 0.6);
}
.btn-cta {
  background: var(--accent-coral);
  color: #ffffff;
  padding: 1rem 1.6rem;
}
.btn-cta:hover, .btn-cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -10px rgba(255, 120, 100, 0.55);
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: .75rem;
  padding: .5rem;
  color: #fff;
}
.mobile-toggle svg { width: 1.4rem; height: 1.4rem; }

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: .25rem;
  padding-bottom: 1.25rem;
}
.mobile-menu.is-open { display: flex; }
.mobile-menu a {
  padding: .8rem 1rem;
  border-radius: var(--radius-md);
  color: var(--text-on-dark-soft);
  font-weight: 500;
}
.mobile-menu a:hover { background: rgba(255,255,255,0.08); color: #fff; }

@media (max-width: 860px) {
  .desktop-nav { display: none; }
  .mobile-toggle { display: inline-flex; }
}

/* =================================================================
   HERO
   ================================================================= */
.hero {
  background: linear-gradient(135deg, var(--indigo-900) 0%, var(--indigo-600) 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,215,106,0.14), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(255,120,100,0.16), transparent 45%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  padding-block: 4.5rem 5.5rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}
.hero-copy {
  display: grid;
  gap: 1.5rem;
  text-align: left;
  justify-items: start;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: var(--indigo-tint-tag);
  color: var(--indigo-500);
  font-weight: 700;
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .55rem 1.1rem;
  border-radius: var(--radius-full);
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  color: #ffffff;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 1.05;
}
.hero-subtitle {
  font-weight: 600;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--accent-yellow);
  max-width: 40ch;
}
.hero-description {
  color: var(--text-on-dark-soft);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 52ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  margin-top: .5rem;
}
.hero-visual {
  display: flex;
  justify-content: center;
}
.hero-visual img {
  width: 100%;
  max-width: 460px;
  height: auto;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    padding-block: 3.5rem 3rem;
  }
  .hero-copy {
    justify-items: center;
    text-align: center;
  }
  .hero-description { max-width: 100%; }
  .hero-visual img { max-width: 320px; }
}

/* =================================================================
   SEZIONE APPLICAZIONI
   ================================================================= */
.apps-section {
  background: var(--indigo-tint-bg);
  padding-block: 5rem;
}
.apps-header {
  text-align: center;
  max-width: 42rem;
  margin: 0 auto 3.25rem;
  display: grid;
  gap: 1rem;
  justify-items: center;
}
.apps-eyebrow {
  display: inline-flex;
  background: var(--indigo-tint-tag);
  color: var(--text-link);
  font-weight: 700;
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .5rem 1.1rem;
  border-radius: var(--radius-full);
}
.apps-title {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--indigo-900);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1.1;
}
.apps-description {
  color: var(--text-body);
  font-size: 1.05rem;
  line-height: 1.6;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
}
@media (max-width: 1024px) {
  .apps-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .apps-grid { grid-template-columns: 1fr; }
}

.tool-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.tool-card:hover, .tool-card:focus-within {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
}
.card-image-wrap {
  height: 11rem;
  overflow: hidden;
  position: relative;
}
.card-badge {
  position: absolute;
  top: .65rem;
  right: .65rem;
  background: var(--accent-yellow);
  color: var(--indigo-900);
  font-weight: 700;
  font-size: .68rem;
  letter-spacing: .03em;
  text-transform: uppercase;
  padding: .3rem .65rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 10px -2px rgba(0, 0, 0, 0.25);
  z-index: 2;
}
.card-image-wrap img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.tool-card:hover .card-image-wrap img { transform: scale(1.06); }
.card-body {
  padding: 1.25rem 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  flex: 1;
}
.card-category {
  font-weight: 700;
  font-size: .7rem;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.card-title {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-heading);
}
.card-description {
  color: var(--text-body);
  font-size: .9rem;
  line-height: 1.5;
  flex: 1;
}
.card-cta {
  margin-top: .5rem;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-weight: 700;
  font-size: .85rem;
  color: var(--text-link);
}
.card-cta svg { width: 1rem; height: 1rem; transition: transform .2s ease; }
.tool-card:hover .card-cta svg { transform: translateX(3px); }
.card-cta-disabled {
  color: var(--text-body);
  cursor: default;
}

/* =================================================================
   FOOTER
   ================================================================= */
.site-footer {
  background: var(--indigo-950);
  color: var(--text-on-dark-muted);
  padding-block: 3.5rem 2rem;
}
.footer-grid {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1.3fr 1fr 1fr;
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: #ffffff;
  margin-bottom: .75rem;
}
.footer-text { font-size: .92rem; line-height: 1.6; max-width: 32ch; }
.footer-heading {
  color: #ffffff;
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.footer-links { display: grid; gap: .65rem; }
.footer-links a { font-size: .92rem; transition: color .2s ease; }
.footer-links a:hover { color: #ffffff; }
.footer-bottom {
  margin-top: 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  font-size: .82rem;
}

/* Focus visibile ovunque (accessibilità) */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent-yellow);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}