/* ============================================================
   Slide Translator — landing page
   Design system: refined violet brand + amber accent
   ============================================================ */

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

:root {
  /* Brand */
  --violet: #6D5EF8;
  --violet-600: #5A48E8;
  --violet-700: #4A38D4;
  --blue: #5B8DEF;
  --amber: #F6B73C;
  --grad: linear-gradient(120deg, #7C6BFF 0%, #6D5EF8 45%, #5B8DEF 100%);
  --grad-text: linear-gradient(120deg, #7C6BFF 0%, #5B8DEF 100%);

  /* Ink & neutrals */
  --ink: #0C1024;
  --ink-2: #1A2036;
  --text: #475067;
  --muted: #7A839B;
  --line: #E8EAF2;
  --line-soft: #F1F2F8;
  --bg: #FFFFFF;
  --bg-soft: #F7F8FC;
  --bg-tint: #F3F1FE;

  /* Effects */
  --shadow-sm: 0 1px 2px rgba(16,18,40,.04), 0 2px 8px rgba(16,18,40,.04);
  --shadow-md: 0 8px 24px rgba(16,18,40,.07), 0 2px 6px rgba(16,18,40,.05);
  --shadow-lg: 0 24px 60px rgba(16,18,40,.12), 0 8px 24px rgba(16,18,40,.08);
  --shadow-violet: 0 14px 36px rgba(109,94,248,.32);
  --radius: 18px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  line-height: 1.65;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

.container { max-width: 1160px; margin: 0 auto; padding: 0 28px; }

h1, h2, h3 { color: var(--ink); font-weight: 800; line-height: 1.12; letter-spacing: -0.03em; }
h1 { font-size: clamp(2.6rem, 5.6vw, 4.2rem); font-weight: 900; }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.9rem); }
h3 { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.01em; }

::selection { background: rgba(109,94,248,.18); }

/* ===================== Buttons ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 26px;
  border-radius: 12px;
  font-weight: 650;
  font-size: 0.97rem;
  font-family: inherit;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .25s ease, background .2s ease, border-color .2s ease, color .2s ease;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: var(--shadow-violet);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 44px rgba(109,94,248,.42); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: rgba(255,255,255,.7);
  color: var(--ink);
  border-color: var(--line);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { border-color: var(--violet); color: var(--violet-600); transform: translateY(-2px); }

.btn-on-dark {
  background: #fff;
  color: var(--violet-700);
  box-shadow: 0 14px 36px rgba(0,0,0,.22);
}
.btn-on-dark:hover { transform: translateY(-2px); box-shadow: 0 20px 48px rgba(0,0,0,.3); }

.btn-sm { padding: 9px 18px; font-size: 0.9rem; border-radius: 10px; }
.btn-large { padding: 16px 32px; font-size: 1.05rem; border-radius: 14px; }

/* ===================== Header ===================== */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease, box-shadow .25s ease;
}
.header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 20px rgba(16,18,40,.05);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.nav-logo { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.logo-img { width: 34px; height: 34px; border-radius: 8px; }
.logo-text { font-weight: 800; font-size: 1.08rem; color: var(--ink); letter-spacing: -0.02em; }

.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 550;
  font-size: 0.93rem;
  position: relative;
  transition: color .2s;
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -4px; height: 2px; width: 0;
  background: var(--grad); border-radius: 2px; transition: width .25s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { width: 100%; }

/* ===================== Hero ===================== */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; }

.hero-bg { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .55; }
.glow-1 { width: 620px; height: 620px; top: -240px; left: 50%; transform: translateX(-60%);
  background: radial-gradient(circle, rgba(124,107,255,.5), transparent 65%); }
.glow-2 { width: 520px; height: 520px; top: -120px; right: -120px;
  background: radial-gradient(circle, rgba(91,141,239,.4), transparent 65%); }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(16,18,40,.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(16,18,40,.04) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, #000 35%, transparent 75%);
          mask-image: radial-gradient(ellipse 80% 55% at 50% 0%, #000 35%, transparent 75%);
}

.hero-inner { text-align: center; position: relative; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 8px 7px 14px;
  background: rgba(255,255,255,.8);
  border: 1px solid var(--line);
  border-radius: 100px;
  font-size: 0.85rem; font-weight: 600; color: var(--ink-2);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  margin-bottom: 28px;
  transition: transform .2s, box-shadow .2s;
}
.hero-badge:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: #22C55E; box-shadow: 0 0 0 4px rgba(34,197,94,.18); }
.badge-arrow { display: inline-flex; width: 22px; height: 22px; align-items: center; justify-content: center;
  background: var(--bg-tint); color: var(--violet-600); border-radius: 50%; font-size: .8rem; transition: transform .2s; }
.hero-badge:hover .badge-arrow { transform: translateX(2px); }

.hero h1 { margin-bottom: 22px; }
.hero h1 .accent { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.hero-sub { font-size: 1.18rem; color: var(--muted); max-width: 620px; margin: 0 auto 34px; line-height: 1.7; }

.hero-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* Traffic-light dots — shared by the real product screenshot frame (.shot-bar) */
.dot.red { background: #FF5F57; } .dot.yellow { background: #FEBC2E; } .dot.green { background: #28C840; }

/* ===================== Section header ===================== */
.section-header { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.eyebrow {
  display: inline-block; font-size: .78rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .12em; color: var(--violet-600); margin-bottom: 14px;
}
.eyebrow.light { color: var(--amber); }
.section-header p { color: var(--muted); font-size: 1.08rem; margin-top: 14px; }

/* Shared icon tints */
.i-violet { background: #EEEBFF; color: #6D5EF8; }
.i-amber  { background: #FEF3DA; color: #D9930B; }
.i-blue   { background: #E4EEFE; color: #3B73E0; }
.i-green  { background: #DDF6E8; color: #16A765; }
.i-red    { background: #FDE6E6; color: #DB4D4D; }

/* ===================== Showcase (screenshots) ===================== */
.showcase { padding: 84px 0; }
.showcase.alt { background: var(--bg-soft); }

.shot-frame {
  max-width: 1000px; margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.shot-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line-soft);
}
.shot-bar .dot { width: 11px; height: 11px; border-radius: 50%; }
.shot-frame img { display: block; width: 100%; height: auto; }

.img-card {
  max-width: 920px; margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: #fff;
}
.img-card img { display: block; width: 100%; height: auto; }
.lang-banner { max-width: 560px; margin: 0 auto 40px; }

/* Preserved-formatting tag cloud */
.format-cloud {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px;
  max-width: 820px; margin: 0 auto 44px;
}
.format-pill {
  display: inline-flex; align-items: center; gap: 2px;
  padding: 8px 16px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 100px;
  font-size: .9rem; font-weight: 550; color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.format-pill:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: rgba(109,94,248,.3); }
.format-pill b { font-weight: 800; }
.format-pill i { font-style: italic; }
.format-pill u { text-decoration: underline; }
.format-pill s { text-decoration: line-through; }
.format-pill mark { background: #FEF08A; color: var(--ink); padding: 1px 5px; border-radius: 4px; }
.format-pill sup, .format-pill sub { color: var(--violet-600); font-weight: 700; }
.sw-color { width: 13px; height: 13px; border-radius: 50%; margin-right: 5px;
  background: conic-gradient(#EF4444, #F59E0B, #10B981, #3B82F6, #8B5CF6, #EF4444); }
.sw-link { color: var(--violet-600); text-decoration: underline; }

/* ===================== Features grid ===================== */
.features { padding: 96px 0; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feat {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.feat:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(109,94,248,.25); }
.feat-icon { width: 48px; height: 48px; border-radius: 13px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.feat-icon svg { width: 24px; height: 24px; }
.feat h3 { margin-bottom: 8px; }
.feat p { color: var(--muted); font-size: .95rem; }

/* ===================== Engines ===================== */
.engines { padding: 96px 0; background: var(--bg-soft); }
.engines-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.engines-text h2 { margin-bottom: 14px; }
.engines-text > p { color: var(--muted); font-size: 1.06rem; margin-bottom: 26px; }
.engine-list { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.engine-list li { display: flex; gap: 13px; align-items: flex-start; font-size: .98rem; color: var(--text); }
.engine-list strong { color: var(--ink); font-weight: 700; }
.engine-dot { width: 12px; height: 12px; border-radius: 50%; margin-top: 7px; flex-shrink: 0; }
.d-blue { background: #4285F4; box-shadow: 0 0 0 4px rgba(66,133,244,.14); }
.d-dark { background: #1A2036; box-shadow: 0 0 0 4px rgba(26,32,54,.12); }
.d-violet { background: var(--violet); box-shadow: 0 0 0 4px rgba(109,94,248,.16); }
.engines-visual {
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: #fff;
}
.engines-visual img { display: block; width: 100%; height: auto; }

/* ===================== How it works ===================== */
.how-it-works { padding: 96px 0; background: var(--ink); color: #fff; position: relative; overflow: hidden; }
.how-it-works::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 50% -10%, rgba(124,107,255,.28), transparent 55%);
}
.how-it-works .container { position: relative; }
.how-it-works .section-header h2 { color: #fff; }
.how-it-works .section-header p { color: rgba(255,255,255,.6); }

.steps-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: background .3s, transform .3s, border-color .3s;
}
.step-card:hover { background: rgba(255,255,255,.09); transform: translateY(-4px); border-color: rgba(124,107,255,.4); }
.step-num {
  width: 48px; height: 48px; margin-bottom: 20px;
  background: var(--grad); border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; font-weight: 800; color: #fff; box-shadow: var(--shadow-violet);
}
.step-card h3 { color: #fff; margin-bottom: 8px; }
.step-card p { color: rgba(255,255,255,.62); font-size: .96rem; }

/* ===================== Languages ===================== */
.languages { padding: 96px 0; }
.lang-cloud { display: flex; flex-wrap: wrap; justify-content: center; gap: 11px; max-width: 860px; margin: 0 auto; }
.lang-pill {
  padding: 10px 20px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 100px;
  font-weight: 550; font-size: .92rem; color: var(--text);
  transition: all .2s ease;
}
.lang-pill:hover {
  border-color: transparent; color: #fff;
  background: var(--grad); transform: translateY(-2px); box-shadow: var(--shadow-violet);
}
.lang-pill.highlight { background: var(--ink); color: #fff; border-color: transparent; font-weight: 700; }
.lang-pill.highlight:hover { background: var(--grad); }

/* ===================== Output options ===================== */
.output-options { padding: 96px 0; background: var(--bg-soft); }
.output-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.output-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
}
.output-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.output-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.output-icon svg { width: 26px; height: 26px; }
.output-card h3 { margin-bottom: 8px; }
.output-card p { color: var(--muted); font-size: .95rem; }

/* ===================== CTA ===================== */
.cta { padding: 92px 0; }
.cta-inner {
  position: relative; overflow: hidden;
  text-align: center;
  background: var(--grad);
  border-radius: 28px;
  padding: 72px 32px;
  box-shadow: var(--shadow-lg);
}
.cta-inner::before { content: ''; position: absolute; width: 460px; height: 460px; top: -180px; right: -120px; background: rgba(255,255,255,.12); border-radius: 50%; }
.cta-inner::after { content: ''; position: absolute; width: 320px; height: 320px; bottom: -160px; left: -80px; background: rgba(255,255,255,.08); border-radius: 50%; }
.cta-inner > * { position: relative; z-index: 1; }
.cta-inner h2 { color: #fff; font-size: clamp(2rem, 4vw, 2.9rem); margin-bottom: 14px; }
.cta-inner p { color: rgba(255,255,255,.9); font-size: 1.12rem; margin-bottom: 30px; max-width: 520px; margin-left: auto; margin-right: auto; }
.cta-fine { display: block; margin-top: 18px; font-size: .85rem; color: rgba(255,255,255,.8); }

/* ===================== Footer ===================== */
.footer { padding: 44px 0; background: var(--ink); color: #fff; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-logo { width: 38px; height: 38px; border-radius: 9px; }
.footer-name { display: block; font-weight: 800; color: #fff; letter-spacing: -.02em; }
.footer-tag { display: block; font-size: .82rem; color: rgba(255,255,255,.5); }
.footer-links { display: flex; gap: 28px; }
.footer-links a { color: rgba(255,255,255,.6); text-decoration: none; font-size: .92rem; transition: color .2s; }
.footer-links a:hover { color: #fff; }
.footer-copy { color: rgba(255,255,255,.4); font-size: .85rem; }

/* ===================== Scroll reveal ===================== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s cubic-bezier(.2,.7,.2,1), transform .6s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
  .tp-progress span { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===================== Responsive ===================== */
@media (max-width: 940px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .engines-inner { grid-template-columns: 1fr; gap: 36px; }
  .engines-visual { max-width: 520px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 124px 0 70px; }
  .feature-grid, .output-grid, .steps-row { grid-template-columns: 1fr; }
  .cta-inner { padding: 52px 24px; }
}

@media (max-width: 460px) {
  .container { padding: 0 20px; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; }
}