/*
 * ScuolaAI — foglio di stile principale.
 *
 * Filosofia visiva: scuola, non startup. Sobrieta', leggibilita',
 * spazio bianco. Niente effetti AI-art, niente glow viola, niente
 * "futuristico". L'AI e' il contenuto, non l'estetica.
 */

:root {
  --color-bg: #fafaf7;
  --color-surface: #ffffff;
  --color-ink: #1a1a1a;
  --color-ink-soft: #555;
  --color-rule: #e2e0d8;
  --color-accent: #b8410a;     /* ruggine sobrio */
  --color-accent-soft: #f5e9e0;
  --color-mente: #2a4d7a;      /* blu profondo per il binario MENTE */
  --color-mani: #6b4423;       /* terra di siena per il binario MANI */
  --color-warning: #c45500;

  --font-display: "Iowan Old Style", "Palatino", Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, monospace;

  --max-width: 1100px;
  --max-prose: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-ink);
}

h1 { font-size: 2.6rem; margin-top: 0; }
h2 { font-size: 2rem; margin-top: 3rem; }
h3 { font-size: 1.4rem; }

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.prose {
  max-width: var(--max-prose);
}

/* ---------- Topbar ---------- */

.topbar {
  border-bottom: 1px solid var(--color-rule);
  background: var(--color-surface);
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}
.topbar .logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-ink);
}
.topbar .logo a { color: inherit; text-decoration: none; }
.topbar nav a {
  color: var(--color-ink-soft);
  margin-left: 1.5rem;
  font-size: 0.95rem;
}
.topbar nav a:hover { color: var(--color-accent); }
.logout-form { display: inline; margin: 0; padding: 0; }
.logout-button {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
}
.topbar nav .logout-button {
  margin-left: 1.5rem;
  color: var(--color-ink-soft);
  font-size: 0.95rem;
}
.topbar nav .logout-button:hover { color: var(--color-accent); }

/* ---------- Hero ---------- */

.hero {
  padding: 6rem 0 4rem 0;
  border-bottom: 1px solid var(--color-rule);
}
.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: 3.4rem;
  max-width: 800px;
  margin-bottom: 1.5rem;
}
.hero p.lead {
  font-size: 1.3rem;
  color: var(--color-ink-soft);
  max-width: 720px;
}

/* ---------- Pilastri ---------- */

.pillars {
  padding: 4rem 0;
  border-bottom: 1px solid var(--color-rule);
}
.pillars h2 {
  margin-top: 0;
  margin-bottom: 2.5rem;
}
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}
.pillar {
  border-top: 3px solid var(--color-accent);
  padding-top: 1rem;
}
.pillar .code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  letter-spacing: 0.05em;
}
.pillar h3 {
  margin: 0.5rem 0 0.8rem 0;
  font-size: 1.3rem;
}
.pillar .motto {
  font-style: italic;
  color: var(--color-accent);
  margin-bottom: 0.8rem;
  font-size: 1rem;
}
.pillar p {
  color: var(--color-ink-soft);
  font-size: 0.95rem;
  margin: 0;
}

/* ---------- Sezioni / CTA ---------- */

.section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--color-rule);
}
.section h2 { margin-top: 0; }
.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--color-ink);
  color: var(--color-ink);
  background: transparent;
  font-size: 0.95rem;
  font-family: var(--font-body);
  cursor: pointer;
}
.btn:hover { background: var(--color-ink); color: var(--color-bg); text-decoration: none; }
.btn.primary { background: var(--color-accent); border-color: var(--color-accent); color: white; }
.btn.primary:hover { background: var(--color-ink); border-color: var(--color-ink); }

/* ---------- Footer ---------- */

footer.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-rule);
  padding: 2.5rem 0;
  color: var(--color-ink-soft);
  font-size: 0.85rem;
}
footer.site-footer .footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ---------- Forms ---------- */

form .field { margin-bottom: 1.2rem; }
form label { display: block; margin-bottom: 0.4rem; font-weight: 600; }
form input[type=text],
form input[type=email],
form input[type=password],
form textarea,
form select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--color-rule);
  background: var(--color-surface);
  font-family: var(--font-body);
  font-size: 1rem;
}
form textarea { min-height: 120px; }
form .help { font-size: 0.85rem; color: var(--color-ink-soft); margin-top: 0.3rem; }
form .errors { color: var(--color-warning); font-size: 0.9rem; }

/* ---------- Chat (Tutor AI) ---------- */

.chat {
  max-width: 760px;
  margin: 0 auto;
}
.chat .msg {
  margin-bottom: 1.2rem;
  padding: 0.9rem 1.1rem;
  border-radius: 4px;
  line-height: 1.55;
}
.chat .msg.student {
  background: var(--color-accent-soft);
  border-left: 3px solid var(--color-accent);
}
.chat .msg.tutor {
  background: var(--color-surface);
  border-left: 3px solid var(--color-mente);
}
.chat .role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  letter-spacing: 0.05em;
  margin-bottom: 0.3rem;
}
.chat form { margin-top: 1.5rem; }

/* ---------- Badges binari ---------- */

.badge-mente {
  display: inline-block;
  background: var(--color-mente);
  color: white;
  padding: 0.15rem 0.55rem;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 2px;
}
.badge-mani {
  display: inline-block;
  background: var(--color-mani);
  color: white;
  padding: 0.15rem 0.55rem;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 2px;
}