/* Sofia — landing site styles
   Dark-only, flat, sharp, accessible.
   Cache-busting query param in HTML references: ?v=20260702
*/

/* --------------------------------------------------------------------------
   Fonts (self-hosted)
   -------------------------------------------------------------------------- */

@font-face {
  font-family: 'Epilogue';
  src: url('../fonts/epilogue-700.ttf?v=20260702') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-400.ttf?v=20260702') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-500.ttf?v=20260702') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('../fonts/jetbrains-mono-500.ttf?v=20260702') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* --------------------------------------------------------------------------
   Design tokens
   -------------------------------------------------------------------------- */

:root {
  --surface: #0d1515;
  --surface-dim: #0d1515;
  --surface-bright: #323b3b;
  --surface-container-lowest: #081010;
  --surface-container-low: #151d1d;
  --surface-container: #192121;
  --surface-container-high: #232b2b;
  --surface-container-highest: #2e3636;

  --on-surface: #dce4e4;
  --on-surface-variant: #bfc8c6;
  --inverse-surface: #dce4e4;
  --inverse-on-surface: #2a3232;

  --outline: #899391;
  --outline-variant: #404847;
  --surface-tint: #9ad1cb;

  --primary: #9ad1cb;
  --on-primary: #003734;
  --primary-container: #134e4a;
  --on-primary-container: #87beb8;
  --inverse-primary: #316763;

  --secondary: #ffb59e;
  --on-secondary: #591c08;
  --secondary-container: #79341e;
  --on-secondary-container: #ffa082;

  --tertiary: #d5c5a8;
  --on-tertiary: #392f1b;
  --tertiary-container: #4f442f;
  --on-tertiary-container: #c1b196;

  --error: #ffb4ab;
  --on-error: #690005;
  --error-container: #93000a;
  --on-error-container: #ffdad6;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--surface);
  color: var(--on-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: 'Epilogue', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 0.5em;
  color: var(--on-surface);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1em;
  color: var(--on-surface-variant);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--secondary);
}

:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background-color: var(--primary);
  color: var(--on-primary);
  padding: 8px 12px;
  font-weight: 500;
  text-decoration: none;
  z-index: 100;
  transition: top 150ms ease;
}

.skip-link:focus {
  top: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 64px;
}

@media (max-width: 1023px) {
  .container {
    padding: 0 24px;
  }
}

@media (max-width: 767px) {
  .container {
    padding: 0 16px;
  }
}

.mono-label {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 0.75rem;
  line-height: 1.33;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: filter 150ms ease, border-color 150ms ease, color 150ms ease;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

.btn-primary:hover {
  filter: brightness(1.1);
  color: var(--on-primary);
}

.btn-secondary {
  background-color: transparent;
  color: var(--on-surface);
  border-color: var(--outline-variant);
}

.btn-secondary:hover {
  border-color: var(--outline);
  color: var(--on-surface);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--surface);
  border-bottom: 1px solid var(--outline-variant);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 80px;
}

.brand img {
  display: block;
  height: 48px;
  width: auto;
}

.nav-list {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
}

.nav-list a:hover {
  color: var(--on-surface);
}

.menu-toggle {
  display: none;
}

.menu-button {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  cursor: pointer;
  background-color: transparent;
  border: 1px solid var(--outline-variant);
}

.menu-button span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--on-surface);
  transition: transform 200ms ease, opacity 200ms ease;
}

.menu-toggle:checked ~ .menu-button span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle:checked ~ .menu-button span:nth-child(2) {
  opacity: 0;
}

.menu-toggle:checked ~ .menu-button span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
  .header-inner {
    height: 64px;
    padding-top: 0;
    padding-bottom: 0;
    flex-wrap: nowrap;
  }

  .brand img {
    height: 40px;
  }

  .menu-button {
    display: flex;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--surface);
    border-bottom: 1px solid var(--outline-variant);
    max-height: 0;
    overflow: hidden;
    transition: max-height 250ms ease;
  }

  .menu-toggle:checked ~ nav {
    max-height: 400px;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 8px 16px 16px;
  }

  .nav-list li {
    border-bottom: 1px solid var(--outline-variant);
  }

  .nav-list li:last-child {
    border-bottom: none;
  }

  .nav-list a {
    display: block;
    padding: 14px 0;
    font-size: 1rem;
  }
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section {
  padding: 96px 0;
}

.section-alt {
  background-color: var(--surface-container-low);
}

@media (max-width: 767px) {
  .section {
    padding: 64px 0;
  }
}

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

.hero {
  padding: 128px 0 96px;
}

.hero .mono-label {
  margin-bottom: 24px;
}

.hero h1 {
  max-width: 900px;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 1.25rem;
  line-height: 1.5;
  max-width: 720px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .hero {
    padding: 80px 0 64px;
  }

  .hero-sub {
    font-size: 1.125rem;
  }
}

/* --------------------------------------------------------------------------
   Problem
   -------------------------------------------------------------------------- */

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.problem-grid p strong {
  color: var(--on-surface);
}

@media (max-width: 767px) {
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* --------------------------------------------------------------------------
   Identity (cosa è / cosa non è)
   -------------------------------------------------------------------------- */

.identity-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}

.identity-panel {
  padding: 32px;
  border: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
}

.identity-panel h3 {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 0.75rem;
  line-height: 1.33;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  margin-bottom: 20px;
}

.identity-not ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.identity-not li {
  position: relative;
  padding-left: 24px;
  color: var(--on-surface-variant);
}

.identity-not li + li {
  margin-top: 12px;
}

.identity-not li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 12px;
  height: 2px;
  background-color: var(--outline);
}

.identity-is {
  border-color: var(--primary);
}

.identity-is h3 {
  color: var(--primary);
}

.identity-is p strong {
  color: var(--on-surface);
}

@media (max-width: 767px) {
  .identity-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 32px;
  }
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.card {
  padding: 32px;
  border: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
  display: flex;
  flex-direction: column;
}

.card h3 {
  margin-bottom: 12px;
  font-size: 1.125rem;
}

.card p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.card-cta {
  margin-top: auto;
  padding-top: 24px;
  align-self: flex-start;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--primary);
  text-decoration: none;
}

.card-cta:hover {
  color: var(--secondary);
}

/* Center a single orphan card in the last row of a 3-column layout */
.card:last-child:nth-child(3n+1) {
  grid-column: 2;
}

@media (max-width: 1023px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .card:last-child:nth-child(3n+1) {
    grid-column: auto;
  }
}

@media (max-width: 767px) {
  .cards {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Compliance
   -------------------------------------------------------------------------- */

.compliance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.compliance-text p {
  font-size: 1.125rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.badge {
  display: inline-flex;
  padding: 8px 12px;
  border: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.badge-highlight {
  border-color: var(--primary);
  color: var(--primary);
}

@media (max-width: 767px) {
  .compliance-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* --------------------------------------------------------------------------
   Steps
   -------------------------------------------------------------------------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.step {
  padding: 32px;
  border: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
}

.step-number {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 2rem;
  font-weight: 500;
  line-height: 1;
  color: var(--primary);
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9375rem;
}

@media (max-width: 1023px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   FAQ
   -------------------------------------------------------------------------- */

.faq-list {
  margin-top: 48px;
  border-top: 1px solid var(--outline-variant);
}

.faq-item {
  border-bottom: 1px solid var(--outline-variant);
}

.faq-item summary {
  padding: 24px 0;
  cursor: pointer;
  font-family: 'Epilogue', sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--on-surface);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  color: var(--primary);
  line-height: 1;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item p {
  padding: 0 0 24px;
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */

.contact-card {
  padding: 48px;
  border: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
  max-width: 720px;
}

.contact-card h2 {
  margin-bottom: 16px;
}

.contact-note {
  margin-top: 16px;
  font-size: 0.875rem;
}

@media (max-width: 767px) {
  .contact-card {
    padding: 32px;
  }
}

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

.site-footer {
  padding: 48px 0;
  border-top: 1px solid var(--outline-variant);
  background-color: var(--surface-container-lowest);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-brand img {
  display: block;
  height: 32px;
  width: auto;
  opacity: 0.8;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: var(--on-surface);
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  margin: 0;
}

@media (max-width: 767px) {
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
}