/* Lingua Viva - standalone landing page */
:root {
  color-scheme: dark;
  --color-bg: #10231f;
  --color-surface: #17312b;
  --color-surface-offset: #203d35;
  --color-panel: #f4efe6;
  --color-panel-soft: #e8dfd0;
  --color-border: rgba(244,239,230,0.12);
  --color-border-strong: rgba(244,239,230,0.22);
  --color-text: #f4efe6;
  --color-text-muted: #c8c1b4;
  --color-text-faint: #8f978e;
  --color-ink: #13211f;
  --color-primary: #7cc7b2;
  --color-primary-dim: rgba(124,199,178,0.14);
  --color-gold: #f2bf5e;
  --color-blue: #88a8d8;
  --color-red: #d96b5f;
  --font-display: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 28px;
  --text-2xl: 54px;
  --text-hero: 84px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;
  --radius-full: 999px;
  --shadow-lg: 0 24px 80px rgba(0,0,0,0.45), 0 8px 28px rgba(0,0,0,0.28);
  --container-max: 1160px;
  --container-pad: clamp(20px, 5vw, 64px);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  color-scheme: light;
  --color-bg: #edf4f2;
  --color-surface: #fbfdf9;
  --color-surface-offset: #dbe9e5;
  --color-panel: #17312b;
  --color-panel-soft: #203d35;
  --color-border: rgba(19,33,31,0.1);
  --color-border-strong: rgba(19,33,31,0.18);
  --color-text: #13211f;
  --color-text-muted: #52615b;
  --color-text-faint: #7a837e;
  --color-ink: #f4efe6;
  --shadow-lg: 0 20px 70px rgba(19,33,31,0.16), 0 5px 20px rgba(19,33,31,0.1);
}

*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 300ms var(--ease-out), color 300ms var(--ease-out);
}
a { color: inherit; text-decoration: none; }
button { border: 0; background: transparent; color: inherit; font: inherit; cursor: pointer; }
img, svg { display: block; max-width: 100%; }
ul { padding-left: 20px; }

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

main:focus { outline: none; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  transform: translateY(-140%);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink);
  padding: 10px 14px;
  font-weight: 800;
  transition: transform 180ms var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

.container {
  width: min(100%, var(--container-max));
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
  transition: transform 260ms var(--ease-out), box-shadow 260ms var(--ease-out);
}
.nav--hidden { transform: translateY(-100%); }
.nav--scrolled { box-shadow: 0 10px 30px rgba(0,0,0,0.22); }
.nav-inner {
  min-height: 64px;
  width: min(100%, var(--container-max));
  padding-inline: var(--container-pad);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
}
.nav-logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--color-panel);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  box-shadow: inset 0 -4px 0 rgba(124,199,178,0.35);
}
.nav-links {
  display: flex;
  gap: var(--space-6);
  margin-left: auto;
}
.nav-links a,
.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.nav-links a:hover,
.footer-links a:hover { color: var(--color-text); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
}
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: var(--text-sm);
  border: 1px solid transparent;
  transition: transform 180ms var(--ease-out), background 180ms var(--ease-out), border-color 180ms var(--ease-out);
  min-width: 0;
  text-align: center;
  text-wrap: balance;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--color-panel); color: var(--color-ink); }
.btn-primary:hover { background: var(--color-primary); }
.btn-ghost {
  color: var(--color-text);
  border-color: var(--color-border-strong);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
}
.btn-sm { min-height: 34px; padding: 8px 14px; font-size: var(--text-xs); }
.btn-download { min-width: 170px; min-height: 48px; }
.btn-disabled {
  color: var(--color-text-faint);
  border-color: var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
  cursor: not-allowed;
  pointer-events: none;
}
.btn-disabled:hover { transform: none; }

.chip {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 24px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  border: 1px solid var(--color-border);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  white-space: nowrap;
}
.chip-local { color: var(--color-primary); background: rgba(124,199,178,0.12); border-color: rgba(124,199,178,0.35); }
.chip-open { color: var(--color-gold); background: rgba(242,191,94,0.12); border-color: rgba(242,191,94,0.35); }
.chip-education { color: var(--color-blue); background: rgba(136,168,216,0.12); border-color: rgba(136,168,216,0.35); }
.chip-lens { color: var(--color-text); background: rgba(244,239,230,0.08); }

.section-label {
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-4);
}
.section-headline {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.05;
  margin-bottom: var(--space-6);
  max-width: 760px;
  text-wrap: balance;
}
.section-sub {
  color: var(--color-text-muted);
  max-width: 720px;
  margin-bottom: var(--space-12);
  text-wrap: pretty;
}

.fade-in {
  opacity: 1;
  transform: translateY(0);
}
.js .fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
}
.js .fade-in.visible { opacity: 1; transform: translateY(0); }

.hero {
  width: min(100%, var(--container-max));
  margin-inline: auto;
  padding: var(--space-16) var(--container-pad) var(--space-16);
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(420px, 1.05fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}
.hero-inner {
  max-width: 620px;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.hero-eyebrow { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.hero-headline {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: 0;
  text-wrap: balance;
}
.hero-headline em {
  font-style: normal;
  color: var(--color-primary);
}
.hero-sub {
  color: var(--color-text-muted);
  font-size: 20px;
  max-width: 54ch;
  text-wrap: pretty;
}
.hero-ctas {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.mobile-download-note {
  flex-basis: 100%;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 12px;
}

.lv-demo {
  position: relative;
  min-width: 0;
}
.lv-window {
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
}
.lv-titlebar {
  position: relative;
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  padding-inline: 64px 16px;
  text-align: center;
}
.lv-dots {
  position: absolute;
  left: 16px;
  display: flex;
  gap: 7px;
}
.lv-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.lv-dots span:nth-child(1) { background: var(--color-red); }
.lv-dots span:nth-child(2) { background: var(--color-gold); }
.lv-dots span:nth-child(3) { background: var(--color-primary); }
.lv-app {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  min-height: 500px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--color-surface-offset) 80%, #000) 0 54px, transparent 54px),
    var(--color-surface);
}
.lv-sidebar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding-top: 24px;
  border-right: 1px solid var(--color-border);
}
.lv-nav-dot {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  border: 1px solid var(--color-border-strong);
}
.lv-nav-dot.active { background: var(--color-primary); border-color: var(--color-primary); }
.lv-workspace {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.lv-toolbar {
  min-height: 62px;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-content: flex-start;
}
.capture-card,
.lens-card,
.os-code-block,
.case-card,
.journey-step {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface-offset) 72%, transparent);
}
.capture-card {
  min-height: 136px;
  padding: var(--space-5, 20px);
}
.capture-label {
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.capture-card p {
  min-height: 64px;
  font-size: 20px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.caret {
  display: inline-block;
  width: 8px;
  height: 1em;
  margin-left: 3px;
  background: var(--color-primary);
  vertical-align: -2px;
  animation: blink 1s steps(1, end) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.lens-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.lens-card {
  min-height: 126px;
  padding: var(--space-4);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 300ms var(--ease-out), transform 300ms var(--ease-out);
}
.lens-card.visible { opacity: 1; transform: translateY(0); }
.lens-card span,
.proof-line {
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 12px;
}
.lens-card strong {
  display: block;
  margin: 10px 0 4px;
  font-family: var(--font-display);
  font-size: 22px;
  overflow-wrap: anywhere;
}
.lens-card p { color: var(--color-text-muted); font-size: 14px; }
.proof-line {
  opacity: 0;
  transition: opacity 300ms var(--ease-out);
}
.proof-line.visible { opacity: 1; }

.trust-bar {
  border-block: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 78%, transparent);
}
.trust-items {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: var(--space-6);
  padding-block: var(--space-6);
}
.trust-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.trust-item strong { color: var(--color-text); font-family: var(--font-display); }
.trust-item span { color: var(--color-text-muted); font-size: var(--text-sm); }
.trust-divider { width: 1px; background: var(--color-border); }

.how-it-works,
.classroom,
.open-source,
.journey,
.final-cta {
  padding-block: clamp(72px, 10vw, 128px);
}
.pipeline {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: var(--space-4);
  align-items: stretch;
}
.pipeline-step {
  padding: var(--space-5, 20px);
  min-height: 240px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.pipeline-step.step-highlight {
  border-color: rgba(124,199,178,0.5);
  box-shadow: inset 0 0 0 1px rgba(124,199,178,0.12);
}
.step-num {
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-size: 12px;
  margin-bottom: var(--space-8);
}
.step-body h3 {
  font-family: var(--font-display);
  font-size: 26px;
  margin-bottom: var(--space-3);
}
.step-body p { color: var(--color-text-muted); }
.pipeline-arrow {
  align-self: center;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.case-card {
  padding: var(--space-6);
  min-height: 300px;
}
.case-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-weight: 800;
  margin-bottom: var(--space-10);
}
.case-card h3 {
  font-family: var(--font-display);
  font-size: 28px;
  margin-bottom: var(--space-3);
}
.case-card p { color: var(--color-text-muted); min-height: 118px; }
.proof-label {
  display: inline-flex;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 12px;
}

.open-source-inner {
  display: grid;
  grid-template-columns: 1fr minmax(340px, 0.8fr);
  gap: var(--space-12);
  align-items: center;
}
.os-text h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.05;
  margin-bottom: var(--space-6);
  text-wrap: balance;
}
.os-text p { color: var(--color-text-muted); margin-bottom: var(--space-6); max-width: 62ch; }
.os-ctas { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-4); }
.os-stat { font-family: var(--font-mono); font-size: 12px; color: var(--color-text-faint); }
.os-code-block { overflow: hidden; }
.code-header {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 12px;
}
.code-badge { color: var(--color-primary); }
.code-pre {
  overflow: auto;
  padding: var(--space-6);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 100%;
}
.code-comment { color: var(--color-text-faint); }
.code-fn { color: var(--color-primary); }
.code-kw { color: var(--color-gold); }
.code-str { color: var(--color-blue); }

.journey-steps {
  display: grid;
  gap: var(--space-3);
}
.journey-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-6);
  padding: var(--space-5, 20px);
}
.journey-num {
  color: var(--color-primary);
  font-family: var(--font-mono);
}
.journey-step h3 {
  font-family: var(--font-display);
  font-size: 24px;
}
.journey-step p { color: var(--color-text-muted); }
.journey-step span {
  display: inline-flex;
  margin-top: var(--space-2);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 12px;
}

.final-cta-inner {
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: clamp(32px, 6vw, 70px);
  text-align: center;
}
.final-cta h1,
.final-cta h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.05;
  margin-bottom: var(--space-4);
  text-wrap: balance;
}
.final-cta p {
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto var(--space-8);
}
.download-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.final-byline {
  font-family: var(--font-mono);
  font-size: 12px;
}

.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-logo {
  font-family: var(--font-display);
  font-weight: 800;
}
.footer-tagline,
.footer-copy {
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}
.footer-links {
  display: flex;
  gap: var(--space-5, 20px);
}

@media (max-width: 980px) {
  :root {
    --text-2xl: 44px;
    --text-hero: 68px;
  }
  .hero,
  .open-source-inner {
    grid-template-columns: 1fr;
  }
  .hero { padding-top: var(--space-12); }
  .pipeline {
    grid-template-columns: 1fr;
  }
  .pipeline-arrow { display: none; }
  .cards-grid,
  .trust-items {
    grid-template-columns: 1fr;
  }
  .trust-divider { display: none; }
}

@media (max-width: 720px) {
  :root {
    --text-2xl: 36px;
    --text-hero: 54px;
  }
  .nav-links { display: none; }
  .nav-inner { gap: var(--space-4); }
  .nav-actions { margin-left: auto; }
  .hero { grid-template-columns: 1fr; }
  .hero-sub { font-size: 17px; }
  .lv-app { grid-template-columns: 42px minmax(0, 1fr); min-height: 480px; }
  .lv-workspace { padding: var(--space-4); }
  .lens-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .journey-step { grid-template-columns: 48px 1fr; }
  .hero-ctas .btn { width: 100%; }
  .download-buttons .btn { width: 100%; }
  .code-pre { font-size: 12px; }
}

@media (max-width: 420px) {
  :root {
    --container-pad: 16px;
    --text-2xl: 32px;
    --text-hero: 46px;
  }
  .nav-logo-mark {
    width: 34px;
    height: 34px;
  }
  .nav-logo span:last-child { display: none; }
  .btn-sm { padding-inline: 10px; }
  .hero-headline { line-height: 1; }
  .lv-titlebar { font-size: 11px; }
  .lv-app { min-height: 500px; }
  .journey-step { gap: var(--space-4); }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .caret { animation: none; }
}

@media print {
  .nav,
  .hero-ctas,
  .os-ctas,
  .download-buttons,
  .footer-links {
    display: none !important;
  }
  body {
    background: #fff;
    color: #111;
  }
  .hero,
  .container {
    width: 100%;
    padding-inline: 0;
  }
  .lv-window,
  .case-card,
  .pipeline-step,
  .journey-step,
  .final-cta-inner {
    box-shadow: none;
    border-color: #aaa;
  }
}