/* =======================================================================
   VoiceBabel — marketing site styles
   Dark-default, tech-minimal. One breakpoint at 768px.
   ======================================================================= */

:root {
  --bg: #0a0a0b;
  --fg: #e8e8ea;
  --muted: #8a8a92;
  --accent: #7cc4ff;
  --surface: #141416;
  --border: #26262b;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --radius: 10px;
  --radius-lg: 14px;
  --max-width: 1040px;

  --section-py-mobile: 3.5rem;
  --section-py-desktop: 6rem;

  --nav-height: 60px;
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* ----- Typography ----- */
h1, h2, h3 {
  margin: 0 0 0.6em;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
h1 { font-size: clamp(2rem, 5vw + 1rem, 3.5rem); }
h2 { font-size: clamp(1.5rem, 2.5vw + 0.8rem, 2.25rem); }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1em; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

/* ----- Layout helpers ----- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}
.container.narrow { max-width: 720px; }
.center { text-align: center; }

.section {
  padding: var(--section-py-mobile) 0;
  border-top: 1px solid var(--border);
}
.section:first-of-type { border-top: none; }

/* ----- Placeholder highlight ----- */
.placeholder {
  display: inline-block;
  padding: 0.15em 0.4em;
  border: 1.5px dashed #d4a84b;
  border-radius: 6px;
  background: rgba(212, 168, 75, 0.08);
  color: #c9b070;
}
.placeholder-inline { color: #c9b070; border-bottom: 1px dashed #d4a84b; }
.placeholder-tag {
  display: inline-block;
  padding: 0.25em 0.6em;
  border: 1.5px dashed #d4a84b;
  border-radius: 6px;
  background: rgba(212, 168, 75, 0.08);
  color: #c9b070;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ----- Nav ----- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(20, 20, 22, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.brand {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.brand:hover { text-decoration: none; color: var(--accent); }
.nav-links {
  display: none;
  flex: 1;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
}
.nav-links a:hover { color: var(--fg); text-decoration: none; }
.nav-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* ----- Language picker ----- */
.lang-picker { position: relative; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-size: 0.875rem;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.lang-btn:hover { border-color: var(--accent); background: rgba(124, 196, 255, 0.06); }
.globe-icon { color: currentColor; }
.lang-current { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.04em; }
.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 160px;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  z-index: 60;
}
.lang-menu li { margin: 0; }
.lang-menu button {
  width: 100%;
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--fg);
}
.lang-menu button:hover { background: rgba(124, 196, 255, 0.1); color: var(--accent); }
.lang-menu button[aria-current="true"] { color: var(--accent); }

/* ----- Buttons ----- */
.btn {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius);
  font-weight: 550;
  font-size: 0.95rem;
  line-height: 1;
  border: 1px solid transparent;
  transition: transform 0.1s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-sm { padding: 0.45rem 0.85rem; font-size: 0.85rem; }
.btn-primary {
  background: var(--accent);
  color: #05121f;
}
.btn-primary:hover { background: #a1d5ff; }
.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* ----- Hero ----- */
.hero { padding-top: calc(var(--section-py-mobile) + 1rem); }
.hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
.lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 40ch;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0 1rem;
}
.icon-placeholder {
  aspect-ratio: 1 / 1;
  max-width: 280px;
  margin: 0 auto;
  border: 1.5px dashed var(--border);
  border-radius: 28px;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ----- Features ----- */
.feature-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}
.feature {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.feature.in-view { opacity: 1; transform: translateY(0); }
.feature h3 { color: var(--accent); }

/* ----- Steps ----- */
.steps {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.step.in-view { opacity: 1; transform: translateY(0); }
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-bottom: 0.75rem;
  border-radius: 50%;
  background: rgba(124, 196, 255, 0.12);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
}

/* ----- Demo frame ----- */
.demo-frame {
  aspect-ratio: 16 / 9;
  background: var(--surface);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ----- FAQ ----- */
.faq-list { display: grid; gap: 0.5rem; }
.faq-list details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.25rem 1rem;
}
.faq-list summary {
  cursor: pointer;
  padding: 0.85rem 0;
  font-weight: 550;
  list-style: none;
  position: relative;
  padding-right: 1.5rem;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}
.faq-list details[open] summary::after { content: "–"; }
.faq-list details > p {
  padding-bottom: 0.85rem;
  margin: 0;
  color: var(--muted);
}

/* ----- Download panel ----- */
.download-panel {
  padding: 2rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

/* ----- Footer ----- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 2rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}
.site-footer p { margin: 0; }

/* ----- Responsive (>= 768px) ----- */
@media (min-width: 768px) {
  .section { padding: var(--section-py-desktop) 0; }
  .hero { padding-top: calc(var(--section-py-desktop) + 1rem); }

  .nav-links { display: flex; }

  .hero-grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
  }

  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
}

/* ----- Reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .feature, .step { opacity: 1; transform: none; transition: none; }
  .btn:hover { transform: none; }
}