/* =========================================================
   Parley — AI Real-Time Phone Translation
   Design: minimal black & white, clean, spacious
   ========================================================= */

:root {
  --black: #0a0a0a;
  --gray-900: #1a1a1a;
  --gray-700: #4a4a4a;
  --gray-500: #767676;
  --gray-300: #d4d4d4;
  --gray-100: #f2f2f2;
  --gray-50: #f9f9f9;
  --white: #ffffff;
  --border: #e6e6e6;
  --max-width: 1140px;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
}

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

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

body {
  font-family: var(--font);
  color: var(--black);
  background: var(--white);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

h1, h2, h3, h4 { line-height: 1.15; font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: 1.3rem; }

p { color: var(--gray-700); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.muted { color: var(--gray-500); }
.center { text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1.5px solid var(--black);
  transition: all 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}
.btn--primary { background: var(--black); color: var(--white); }
.btn--primary:hover { background: var(--white); color: var(--black); }
.btn--ghost { background: transparent; color: var(--black); }
.btn--ghost:hover { background: var(--black); color: var(--white); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav__logo {
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav__logo svg { width: 26px; height: 26px; }
.nav__links { display: flex; align-items: center; gap: 36px; }
.nav__links a { font-size: 0.97rem; font-weight: 500; color: var(--gray-700); transition: color 0.2s; }
.nav__links a:hover { color: var(--black); }
.nav__cta { display: flex; align-items: center; gap: 16px; }
.nav__toggle { display: none; background: none; border: none; cursor: pointer; }
.nav__toggle svg { width: 28px; height: 28px; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 80px; text-align: center; }
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 28px;
}
.hero__badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--black); }
.hero h1 { margin-bottom: 24px; }
.hero__sub {
  font-size: 1.25rem;
  max-width: 620px;
  margin: 0 auto 40px;
  color: var(--gray-700);
}
.hero__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero__note { margin-top: 20px; font-size: 0.9rem; color: var(--gray-500); }

/* ---------- Hero demo visual ---------- */
.hero__demo {
  max-width: 680px;
  margin: 64px auto 0;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  background: var(--gray-50);
  text-align: left;
}
.call-line {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
}
.call-line + .call-line { border-top: 1px solid var(--border); }
.call-line__avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--black);
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem;
  flex-shrink: 0;
}
.call-line__avatar--alt { background: var(--white); color: var(--black); border: 1.5px solid var(--black); }
.call-line__body { flex: 1; }
.call-line__orig { font-weight: 600; color: var(--black); }
.call-line__trans { color: var(--gray-500); font-size: 0.95rem; margin-top: 2px; }
.call-line__lang { font-size: 0.75rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; }

/* ---------- Logos / trust ---------- */
.trust { padding: 48px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.trust__label { text-align: center; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray-500); margin-bottom: 28px; }
.trust__row { display: flex; align-items: center; justify-content: center; gap: 56px; flex-wrap: wrap; }
.trust__row span { font-weight: 700; font-size: 1.2rem; color: var(--gray-300); letter-spacing: -0.02em; }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section__head { max-width: 640px; margin: 0 auto 64px; text-align: center; }
.section__head h2 { margin-bottom: 16px; }
.eyebrow { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-500); font-weight: 700; margin-bottom: 16px; }

/* ---------- Features grid ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature {
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s;
}
.feature:hover { border-color: var(--black); transform: translateY(-3px); }
.feature__icon {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--black);
  border-radius: 12px;
  margin-bottom: 20px;
}
.feature__icon svg { width: 24px; height: 24px; }
.feature h3 { margin-bottom: 10px; }
.feature p { font-size: 0.97rem; }

/* ---------- How it works ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; counter-reset: step; }
.step { position: relative; }
.step__num {
  font-size: 0.85rem; font-weight: 700; color: var(--gray-500);
  border: 1px solid var(--border); border-radius: 50%;
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.step h3 { margin-bottom: 10px; }
.step p { font-size: 0.97rem; }

/* ---------- Use cases preview ---------- */
.usecases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.usecase {
  padding: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--gray-50);
  transition: transform 0.2s;
}
.usecase:hover { transform: translateY(-3px); }
.usecase__tag { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-500); margin-bottom: 12px; }
.usecase h3 { margin-bottom: 10px; }
.usecase p { font-size: 0.97rem; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat__num { font-size: 2.8rem; font-weight: 800; letter-spacing: -0.03em; }
.stat__label { color: var(--gray-500); font-size: 0.95rem; margin-top: 4px; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--black); color: var(--white); border-radius: 24px; padding: 72px 40px; text-align: center; }
.cta-band h2 { color: var(--white); margin-bottom: 16px; }
.cta-band p { color: var(--gray-300); max-width: 520px; margin: 0 auto 36px; }
.cta-band .btn--primary { background: var(--white); color: var(--black); border-color: var(--white); }
.cta-band .btn--primary:hover { background: transparent; color: var(--white); }

/* ---------- Blog ---------- */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.post-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
  display: flex; flex-direction: column;
}
.post-card:hover { transform: translateY(-4px); border-color: var(--black); }
.post-card__img { aspect-ratio: 16/9; background: var(--gray-100); display: flex; align-items: center; justify-content: center; }
.post-card__img svg { width: 56px; height: 56px; color: var(--gray-300); }
.post-card__body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.post-card__meta { font-size: 0.82rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 12px; }
.post-card h3 { margin-bottom: 10px; font-size: 1.2rem; }
.post-card p { font-size: 0.95rem; flex: 1; }
.post-card__link { margin-top: 16px; font-weight: 600; font-size: 0.95rem; display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Article ---------- */
.article { max-width: 720px; margin: 0 auto; padding: 64px 0; }
.article__meta { font-size: 0.9rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 20px; }
.article h1 { margin-bottom: 24px; }
.article__lede { font-size: 1.25rem; color: var(--gray-700); margin-bottom: 40px; }
.article h2 { font-size: 1.7rem; margin: 40px 0 16px; }
.article h3 { margin: 32px 0 12px; }
.article p { margin-bottom: 20px; }
.article ul.bullets { list-style: disc; padding-left: 24px; margin-bottom: 20px; }
.article ul.bullets li { margin-bottom: 8px; color: var(--gray-700); }
.article blockquote { border-left: 3px solid var(--black); padding-left: 20px; margin: 28px 0; font-size: 1.2rem; font-style: italic; color: var(--gray-900); }
.article__back { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; margin-bottom: 32px; font-size: 0.95rem; }

/* ---------- Page hero (sub pages) ---------- */
.page-hero { padding: 80px 0 48px; text-align: center; border-bottom: 1px solid var(--border); }
.page-hero h1 { margin-bottom: 16px; }
.page-hero p { max-width: 600px; margin: 0 auto; font-size: 1.15rem; }

/* ---------- Use case detail ---------- */
.uc-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 72px 0; }
.uc-detail:nth-child(even) .uc-detail__media { order: -1; }
.uc-detail + .uc-detail { border-top: 1px solid var(--border); }
.uc-detail__media { aspect-ratio: 4/3; background: var(--gray-50); border: 1px solid var(--border); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; }
.uc-detail__media svg { width: 72px; height: 72px; color: var(--gray-300); }
.uc-detail h2 { font-size: 2rem; margin-bottom: 16px; }
.uc-detail ul.bullets { list-style: none; margin-top: 20px; }
.uc-detail ul.bullets li { padding-left: 28px; position: relative; margin-bottom: 12px; color: var(--gray-700); }
.uc-detail ul.bullets li::before { content: "✓"; position: absolute; left: 0; font-weight: 700; color: var(--black); }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--border); }
.faq__q { width: 100%; text-align: left; background: none; border: none; padding: 24px 0; font-size: 1.1rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; font-family: inherit; color: var(--black); }
.faq__q svg { width: 20px; height: 20px; flex-shrink: 0; transition: transform 0.2s; }
.faq__item.open .faq__q svg { transform: rotate(45deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq__a p { padding-bottom: 24px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 64px 0 32px; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer__brand .nav__logo { margin-bottom: 16px; }
.footer__brand p { font-size: 0.95rem; max-width: 280px; }
.footer__col h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-500); margin-bottom: 18px; }
.footer__col ul li { margin-bottom: 12px; }
.footer__col ul li a { font-size: 0.95rem; color: var(--gray-700); transition: color 0.2s; }
.footer__col ul li a:hover { color: var(--black); }
.footer__bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 28px; border-top: 1px solid var(--border); font-size: 0.88rem; color: var(--gray-500); flex-wrap: wrap; gap: 16px; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .features, .steps, .blog-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .uc-detail { grid-template-columns: 1fr; gap: 28px; }
  .uc-detail:nth-child(even) .uc-detail__media { order: 0; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav__links { display: none; }
  .nav__cta .btn--ghost { display: none; }
  .nav__toggle { display: block; }
  .nav__links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 72px; left: 0; right: 0; background: var(--white);
    border-bottom: 1px solid var(--border); padding: 24px; gap: 20px;
  }
  .features, .steps, .usecases, .blog-grid, .stats, .footer__grid { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .hero { padding: 56px 0; }
  .cta-band { padding: 48px 24px; }
}