/* BusinessAI.academy — design system
   Navy su carta, Jost + Inter + IBM Plex Mono, raggio 7px, niente gradienti. */

:root {
  --white: #ffffff;   /* ground and card face */
  --paper: #f1eee7;   /* tint: wells, inputs, highlighted rows */
  --ink: #0b0b0b;
  --navy: #24406b;
  --navy-light: #7c9ac9;
  --muted: #6b675e;   /* warm grey — secondary text */
  --border: #ddd9d0;  /* box outlines */
  --hairline: #e8e5df;/* internal rules and dividers */
  --radius: 7px;
  --max: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: "Inter", ui-sans-serif, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: "Jost", "Inter", sans-serif; font-weight: 600; letter-spacing: -0.01em; margin: 0; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
li { list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; }

.mono { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: 0.75rem; letter-spacing: 0.05em; }
.eyebrow { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: 0.75rem; letter-spacing: 0.05em; color: var(--muted); text-transform: uppercase; }
.muted { color: var(--muted); }
.navy { color: var(--navy); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.5rem; }
.section { padding-block: 4rem; }
.section--lg { padding-block: 6rem; }
.bordered { border-bottom: 1px solid var(--hairline); }

.page { display: flex; min-height: 100vh; flex-direction: column; }
main { flex: 1; }

/* Header */
.site-header { border-bottom: 1px solid var(--border); }
.site-header__bar { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1.5rem; max-width: var(--max); margin: 0 auto; }
.wordmark { font-family: "Jost", sans-serif; font-size: 1.25rem; font-weight: 600; letter-spacing: -0.02em; text-decoration: none; }
.wordmark span { color: var(--navy); }
.nav { display: none; align-items: center; gap: 2rem; }
.nav a { font-size: 0.875rem; color: var(--muted); text-decoration: none; transition: color 0.15s ease; }
.nav a:hover { color: var(--ink); }
.nav a.is-active { color: var(--ink); font-weight: 500; }
.nav-toggle { display: inline-flex; background: none; border: 0; font: inherit; font-size: 0.875rem; font-weight: 500; color: var(--ink); cursor: pointer; padding: 0; }
.nav-mobile { border-top: 1px solid var(--border); padding: 1rem 1.5rem; }
.nav-mobile[hidden] { display: none; }
.nav-mobile ul { display: flex; flex-direction: column; gap: 1rem; }
.nav-mobile a { text-decoration: none; font-size: 1rem; }

@media (min-width: 768px) {
  .nav { display: flex; }
  .nav-toggle, .nav-mobile { display: none !important; }
}

/* Buttons */
.btn {
  display: inline-block;
  border-radius: var(--radius);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, opacity 0.15s ease;
}
.btn--primary { background: var(--navy); color: var(--white); }
.btn--primary:hover { opacity: 0.9; }
.btn--ghost { border-color: var(--border); color: var(--ink); background: transparent; }
.btn--ghost:hover { background: rgba(0, 0, 0, 0.04); }
.btn--lg { padding: 0.75rem 1.5rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }

/* Hero + type scale */
.h1 { font-size: 2.25rem; line-height: 1.2; font-weight: 700; }
.h2 { font-size: 1.5rem; line-height: 1.2; }
.h3 { font-size: 1.125rem; line-height: 1.35; }
.lead { font-size: 1.125rem; color: var(--muted); }
.measure { max-width: 34rem; }
.measure-lg { max-width: 42rem; }
.mt-2 { margin-top: 0.5rem; } .mt-3 { margin-top: 0.75rem; } .mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; } .mt-8 { margin-top: 2rem; } .mt-10 { margin-top: 2.5rem; } .mt-12 { margin-top: 3rem; }

@media (min-width: 768px) {
  .h1 { font-size: 3rem; }
}

/* Grids */
.grid { display: grid; gap: 2rem; }
@media (min-width: 768px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--2 { grid-template-columns: repeat(2, 1fr); gap: 3rem; }
}
@media (min-width: 1024px) {
  .grid--cards { grid-template-columns: repeat(2, 1fr); }
}

.step { border-top: 1px solid var(--hairline); padding-top: 1.5rem; }
.step__row { display: flex; align-items: baseline; justify-content: space-between; }

/* Card / course */
.card { border: 1px solid var(--border); background: var(--white); border-radius: var(--radius); padding: 2rem; }
.card--accent { border-color: var(--navy); }
@media (min-width: 768px) { .card--wide { padding: 3rem; } }

.course__meta { display: flex; flex-wrap: wrap; gap: 1.5rem; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); padding: 1rem 0; margin-top: 1.5rem; }
.course__modules { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.course__module { display: flex; align-items: baseline; gap: 1rem; font-size: 0.875rem; }
.course__module span:nth-child(2) { flex: 1; }

.list-rule li { display: flex; gap: 1rem; border-bottom: 1px solid var(--hairline); padding-bottom: 1rem; margin-top: 1rem; font-size: 0.875rem; }

.spec { display: flex; flex-direction: column; gap: 1rem; font-size: 0.875rem; margin-top: 1.5rem; }
.spec > div { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--hairline); padding-bottom: 1rem; }
.spec > div:last-child { border-bottom: 0; padding-bottom: 0; }

.specgrid { display: grid; gap: 1.5rem; border-top: 1px solid var(--hairline); padding-top: 2rem; margin-top: 2rem; }
@media (min-width: 640px) { .specgrid { grid-template-columns: repeat(3, 1fr); } }

/* Form */
.field { margin-bottom: 1.25rem; }
.field label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.375rem; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  font: inherit;
  font-size: 0.875rem;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--navy); outline-offset: 1px; }
.field--row { display: grid; gap: 1.25rem; }
@media (min-width: 640px) { .field--row { grid-template-columns: 1fr 1fr; } }
.error { color: #b3261e; font-size: 0.8125rem; margin-top: 0.25rem; }
.field input:disabled { opacity: 0.6; }

/* Footer */
.site-footer { background: var(--navy); color: var(--white); }
.site-footer a { color: inherit; text-decoration: none; opacity: 0.8; }
.site-footer a:hover { opacity: 1; }
.site-footer__top { display: flex; flex-direction: column; gap: 2.5rem; }
.site-footer .wordmark span { color: var(--navy-light); }
.site-footer__bottom { margin-top: 3rem; border-top: 1px solid rgba(255, 255, 255, 0.2); padding-top: 1.5rem; font-size: 0.75rem; opacity: 0.7; }
@media (min-width: 768px) {
  .site-footer__top { flex-direction: row; justify-content: space-between; align-items: flex-start; }
}
.stack-3 { display: flex; flex-direction: column; gap: 0.75rem; font-size: 0.875rem; }
.stack-5 > * + * { margin-top: 1.25rem; }

.center { text-align: center; }
.center .measure { margin-left: auto; margin-right: auto; }

/* Small screens: keep mono labels inside the gutter */
@media (max-width: 480px) {
  .eyebrow, .mono { font-size: 0.6875rem; letter-spacing: 0.04em; overflow-wrap: anywhere; }
  .course__meta { gap: 0.75rem 1rem; }
}