/* Phraseon — tanıtım sayfası */
:root {
  --deep: #3B5BA5;
  --light: #6A9BE8;
  --off: #F6F6F4;
  --ink: #16171A;
  --white: #FFFFFF;
  --text-2: #3E4048;
  --text-3: #5A5C63;
  --line: #E3E3DE;
  --dark-line: #2A2C33;
  --dark-text-2: #C9CBD1;
  --dark-text-3: #9EA1A9;
  --container: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--off);
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--deep); }
a:hover { color: var(--ink); }
h1, h2, h3, p { margin: 0; }
:focus-visible { outline: 3px solid var(--light); outline-offset: 3px; border-radius: 6px; }

.container { max-width: var(--container); margin: 0 auto; }
.section { padding: 96px 24px; }
.section--white { background: var(--white); }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 16px; z-index: 10; background: var(--white); padding: 12px 16px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 18px 28px; border-radius: 16px;
  font-size: 17px; font-weight: 600; text-decoration: none;
  transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { transform: translateY(-1px); opacity: .92; }
.btn--light { background: var(--off); color: var(--ink); }
.btn--light:hover { color: var(--ink); }
.btn svg { flex-shrink: 0; }

/* ---------- Hero (dark) ---------- */
.hero-wrap { background: var(--ink); color: var(--off); overflow: hidden; }
.site-header { padding: 20px 24px; border-bottom: 1px solid var(--dark-line); }
.nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--off); text-decoration: none; }
.brand:hover { color: var(--off); }
.brand span { font-size: 22px; font-weight: 600; letter-spacing: -0.03em; }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.nav-links a { padding: 12px 14px; font-size: 15px; font-weight: 500; color: var(--dark-text-2); text-decoration: none; }
.nav-links a:hover { color: var(--white); }
.nav-links .nav-cta { padding: 12px 20px; border-radius: 999px; background: var(--off); color: var(--ink); font-weight: 600; }
.nav-links .nav-cta:hover { color: var(--ink); opacity: .9; }

.hero { padding: 80px 24px 0; }
.hero .container { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 56px; }
.hero-copy { flex: 1 1 500px; min-width: 0; display: flex; flex-direction: column; gap: 28px; padding-bottom: 80px; }
.badge {
  align-self: flex-start; display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 999px; background: #232B3D; color: #B9CCF2;
  font-size: 14px; font-weight: 600;
}
.badge i { width: 8px; height: 8px; border-radius: 50%; background: var(--light); }
.hero h1 { font-size: clamp(46px, 6.2vw, 80px); line-height: 1.02; font-weight: 700; letter-spacing: -0.04em; color: var(--white); }
.hero h1 em { font-style: normal; color: var(--light); }
.hero .lead { max-width: 540px; font-size: 20px; line-height: 1.6; color: var(--dark-text-2); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; }
.hero-actions span { font-size: 15px; color: var(--dark-text-3); }
.hero-facts { display: flex; flex-wrap: wrap; gap: 28px; padding-top: 28px; border-top: 1px solid var(--dark-line); }
.hero-facts div { display: flex; flex-direction: column; gap: 4px; }
.hero-facts strong { font-size: 15px; font-weight: 600; color: var(--white); }
.hero-facts span { font-size: 14px; color: var(--dark-text-3); }

/* ---------- Silver Android device ---------- */
.hero-visual { flex: 0 1 440px; position: relative; display: flex; justify-content: center; align-self: flex-end; padding-top: 8px; }
.halo { position: absolute; left: 50%; border-radius: 50%; pointer-events: none; }
.halo--fill { width: 520px; height: 520px; top: 90px; margin-left: -260px; background: #1E2740; }
.halo--ring { width: 360px; height: 360px; top: 170px; margin-left: -180px; box-shadow: inset 0 0 0 1px #33415F; }

.device { position: relative; width: 292px; max-width: 100%; margin-bottom: 72px; }
.device__btn {
  position: absolute; right: -4px; width: 5px; border-radius: 0 3px 3px 0;
  background: linear-gradient(90deg, #8E939B, #E9EBEE 50%, #A3A8B0);
}
.device__btn--vol { top: 128px; height: 58px; }
.device__btn--pwr { top: 206px; height: 34px; }
.device__frame {
  position: relative; border-radius: 44px; padding: 4px;
  background: linear-gradient(150deg, #FAFBFC 0%, #C5C9D0 16%, #8B9098 34%, #EEF0F3 50%, #9CA1A9 68%, #F5F6F8 84%, #B1B6BD 100%);
  box-shadow: 0 50px 90px rgba(0, 0, 0, .55), 0 0 0 1px rgba(255, 255, 255, .35);
}
.device__rim { border-radius: 40px; padding: 1.5px; background: linear-gradient(150deg, #FFFFFF, #7D828A 45%, #E4E6EA); }
.device__bezel { border-radius: 38.5px; padding: 6px; background: #050608; }
.device__screen { position: relative; border-radius: 33px; overflow: hidden; background: #111827; }
.device__screen img { display: block; width: 100%; height: auto; }
.device__camera {
  position: absolute; left: 50%; top: 11px; width: 11px; height: 11px; margin-left: -5.5px;
  border-radius: 50%; background: #050608; box-shadow: 0 0 0 2px #1A1C22;
}

/* ---------- Section headings ---------- */
.eyebrow { font-size: 14px; font-weight: 600; letter-spacing: .08em; color: var(--deep); }
.section-head { display: flex; flex-direction: column; gap: 12px; max-width: 680px; }
.section-head h2 { font-size: clamp(32px, 4vw, 44px); line-height: 1.12; font-weight: 700; letter-spacing: -0.03em; }
.section-head p:not(.eyebrow) { font-size: 18px; line-height: 1.55; color: var(--text-2); }
.stack { display: flex; flex-direction: column; gap: 48px; }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.step { padding: 32px; border-radius: 24px; background: var(--off); display: flex; flex-direction: column; gap: 14px; }
.step__num {
  width: 44px; height: 44px; border-radius: 50%; background: var(--deep); color: var(--white);
  display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 700;
}
.step h3, .feature h3 { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; }
.step p, .feature p { font-size: 16px; line-height: 1.55; color: var(--text-2); }

/* ---------- Features ---------- */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.feature { padding: 32px; border-radius: 24px; background: var(--white); box-shadow: inset 0 0 0 1px var(--line); display: flex; flex-direction: column; gap: 12px; }
.feature h3 { font-size: 21px; }

/* ---------- Audience ---------- */
.audience { display: flex; flex-wrap: wrap; gap: 48px; align-items: center; }
.audience > * { flex: 1 1 420px; min-width: 0; }
.checklist { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 16px; }
.checklist li { display: flex; gap: 14px; align-items: flex-start; font-size: 18px; line-height: 1.5; }
.checklist svg { flex-shrink: 0; margin-top: 2px; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 32px; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq details { padding: 22px 24px; border-radius: 18px; background: var(--white); box-shadow: inset 0 0 0 1px var(--line); }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; font-size: 18px; font-weight: 600; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-weight: 500; color: var(--deep); font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin-top: 12px; font-size: 16px; line-height: 1.55; color: var(--text-2); }

/* ---------- Final CTA ---------- */
.cta { padding: 24px 24px 96px; }
.cta__box {
  border-radius: 32px; background: var(--ink); color: var(--off); padding: 72px 40px;
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 24px;
}
.cta__box h2 { max-width: 720px; font-size: clamp(32px, 4.5vw, 52px); line-height: 1.1; font-weight: 700; letter-spacing: -0.03em; }
.cta__box p { max-width: 560px; font-size: 18px; line-height: 1.55; color: var(--dark-text-2); }

/* ---------- Footer ---------- */
.site-footer { padding: 32px 24px 48px; border-top: 1px solid var(--line); }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 600; letter-spacing: -0.02em; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-links a { padding: 12px; font-size: 14px; color: var(--text-3); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

/* ---------- Small screens ---------- */
@media (max-width: 720px) {
  .section { padding: 72px 20px; }
  .hero { padding: 48px 20px 0; }
  .hero-copy { padding-bottom: 24px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .device { width: 272px; }
  .halo--fill { width: 400px; height: 400px; margin-left: -200px; top: 60px; }
  .halo--ring { display: none; }
  .features, .steps { grid-template-columns: 1fr; }
  .cta__box { padding: 56px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}