:root {
  --bg: #ffffff;
  --bg-soft: #f4f4ff;
  --bg-dark: #14142b;
  --ink: #16162a;
  --ink-2: #51516b;
  --line: #e4e4f2;
  --accent: #686df4;
  --accent-dark: #4b50d8;
  --accent-soft: #e9e9ff;
  --ok: #1f9d6b;
  --bad: #d4506b;
  --radius: 18px;
  --max: 1160px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 5.4vw, 4.2rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); font-weight: 750; }
h3 { font-size: 1.25rem; font-weight: 700; }
p { color: var(--ink-2); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section.soft { background: var(--bg-soft); }
.section.dark { background: var(--bg-dark); color: #fff; }
.section.dark p { color: #b9b9d6; }
.sec-head { max-width: 720px; margin-bottom: 48px; }
.sec-head p { margin-top: 14px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent-dark); background: var(--accent-soft);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 18px;
}
.dark .eyebrow { background: rgba(104,109,244,0.25); color: #c9caff; }

/* header */
.header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.header .wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.logo img { height: 36px; width: auto; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { padding: 9px 16px; border-radius: 999px; font-weight: 600; font-size: 0.95rem; color: var(--ink-2); transition: background .2s, color .2s; }
.nav a:hover, .nav a.active { background: var(--accent-soft); color: var(--accent-dark); }
.header-cta { display: flex; align-items: center; gap: 12px; }
.burger { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; background: #fff; cursor: pointer; font-size: 1.2rem; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: 999px; font-weight: 700; font-size: 1rem;
  border: 2px solid transparent; cursor: pointer; transition: transform .15s, background .2s, border-color .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn-light { background: #fff; color: var(--accent-dark); }
.btn-sm { padding: 10px 20px; font-size: 0.92rem; }

/* hero shared */
.hero { padding: 80px 0 72px; }
.hero p.lead { font-size: 1.2rem; max-width: 620px; margin-top: 22px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero h1 em { font-style: normal; color: var(--accent); }

/* home hero: left text + stat stack */
.hero-home { background: radial-gradient(900px 400px at 85% 0%, var(--accent-soft), transparent 70%); }
.hero-home .wrap { display: grid; grid-template-columns: 1.3fr 1fr; gap: 56px; align-items: center; }
.stat-stack { display: grid; gap: 16px; }
.stat-card { border: 1px solid var(--line); background: #fff; border-radius: var(--radius); padding: 22px 26px; box-shadow: 0 12px 30px rgba(104,109,244,0.08); }
.stat-card strong { display: block; font-size: 2rem; color: var(--accent-dark); letter-spacing: -0.02em; }
.stat-card span { color: var(--ink-2); font-size: 0.95rem; }
.stat-card:nth-child(2) { margin-left: 28px; }
.stat-card:nth-child(3) { margin-left: 56px; }

/* cards grids */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(22,22,42,0.08); }
.card .ico { width: 46px; height: 46px; border-radius: 14px; background: var(--accent-soft); color: var(--accent-dark); display: grid; place-items: center; font-weight: 800; margin-bottom: 18px; }
.card h3 { margin-bottom: 10px; }
.card p + p { margin-top: 10px; }

/* steps */
.steps { counter-reset: s; display: grid; gap: 18px; max-width: 860px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.steps li::before { content: counter(s); width: 52px; height: 52px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 800; font-size: 1.3rem; display: grid; place-items: center; }
.steps h3 { margin-bottom: 6px; }

/* split blocks */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.panel { background: var(--bg-soft); border-radius: 26px; padding: 36px; }
.tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.tag { padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); background: #fff; font-weight: 600; font-size: 0.92rem; color: var(--ink); }
.ticks li { position: relative; padding-left: 32px; margin-bottom: 14px; color: var(--ink-2); }
.ticks li::before { content: "\2713"; position: absolute; left: 0; top: 0; width: 22px; height: 22px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-dark); font-size: 0.8rem; font-weight: 800; display: grid; place-items: center; margin-top: 3px; }
.ticks.minus li::before { content: "\2212"; background: #fde8ed; color: var(--bad); }

/* faq */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq details { border: 1px solid var(--line); border-radius: 16px; background: #fff; padding: 4px 24px; }
.faq summary { cursor: pointer; font-weight: 700; padding: 18px 0; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 1.5rem; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { padding-bottom: 20px; }

/* cta band */
.cta-band { background: linear-gradient(120deg, var(--accent), #8a6df4); color: #fff; border-radius: 30px; padding: 64px 48px; text-align: center; }
.cta-band p { color: #ecebff; max-width: 560px; margin: 16px auto 28px; }

/* footer */
.footer { border-top: 1px solid var(--line); padding: 56px 0 36px; margin-top: 88px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 32px; }
.footer img { height: 32px; width: auto; margin-bottom: 14px; }
.footer h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 14px; }
.footer li { margin-bottom: 9px; color: var(--ink-2); font-size: 0.95rem; }
.footer li a:hover { color: var(--accent-dark); }
.copy { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 0.88rem; color: var(--ink-2); }

/* ---------- ENHANCE page ---------- */
.hero-enh { text-align: center; background: linear-gradient(180deg, var(--bg-soft), #fff); }
.hero-enh p.lead { margin-left: auto; margin-right: auto; }
.hero-enh .actions { justify-content: center; }
.wave-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 900px; margin: 52px auto 0; }
.wave-box { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: left; }
.wave-box h3 { font-size: 0.95rem; margin-bottom: 14px; display: flex; justify-content: space-between; }
.wave-box h3 span { color: var(--ink-2); font-weight: 600; }
.wave { display: flex; align-items: center; gap: 4px; height: 96px; }
.wave i { flex: 1; border-radius: 4px; background: #c9c9dc; min-height: 6px; height: 30%; }
.wave.noisy i:nth-child(4n+1) { height: 62%; } .wave.noisy i:nth-child(4n+2) { height: 85%; }
.wave.noisy i:nth-child(4n+3) { height: 40%; } .wave.noisy i:nth-child(4n) { height: 74%; }
.wave.clean i { background: var(--accent); }
.wave.clean i:nth-child(6n+1) { height: 28%; } .wave.clean i:nth-child(6n+2) { height: 70%; }
.wave.clean i:nth-child(6n+3) { height: 92%; } .wave.clean i:nth-child(6n+4) { height: 56%; }
.wave.clean i:nth-child(6n+5) { height: 80%; } .wave.clean i:nth-child(6n) { height: 22%; }

.removes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.removes div { padding: 24px 20px; border-radius: var(--radius); background: #fff; border: 1px dashed var(--accent); text-align: center; }
.removes b { display: block; font-size: 1.05rem; margin-bottom: 6px; }
.removes span { font-size: 0.9rem; color: var(--ink-2); }

table.cmp { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }
.cmp th, .cmp td { text-align: left; padding: 18px 22px; border-bottom: 1px solid var(--line); vertical-align: top; }
.cmp th { background: var(--accent-soft); color: var(--accent-dark); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }
.cmp td:first-child { font-weight: 700; color: var(--ink); }
.cmp td { color: var(--ink-2); }
.cmp tr:last-child td { border-bottom: 0; }

.tips { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.tip { display: flex; gap: 18px; padding: 24px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.tip b { flex: 0 0 auto; width: 40px; height: 40px; border-radius: 12px; background: var(--ink); color: #fff; display: grid; place-items: center; }

/* ---------- AI page ---------- */
.hero-ai { background: var(--bg-dark); color: #fff; position: relative; overflow: hidden; }
.hero-ai::before { content: ""; position: absolute; width: 620px; height: 620px; right: -160px; top: -240px; border-radius: 50%; background: radial-gradient(circle, rgba(104,109,244,0.55), transparent 70%); }
.hero-ai .wrap { position: relative; }
.hero-ai p { color: #b9b9d6; }
.hero-ai .btn-ghost { border-color: #fff; color: #fff; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.chip { padding: 9px 18px; border-radius: 999px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.18); font-weight: 600; font-size: 0.92rem; }

.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.bento .card:nth-child(1) { grid-column: span 4; background: var(--accent); color: #fff; border: 0; }
.bento .card:nth-child(1) p { color: #ecebff; }
.bento .card:nth-child(1) .ico { background: rgba(255,255,255,0.2); color: #fff; }
.bento .card:nth-child(2) { grid-column: span 2; }
.bento .card:nth-child(3) { grid-column: span 2; }
.bento .card:nth-child(4) { grid-column: span 2; }
.bento .card:nth-child(5) { grid-column: span 2; }

.tabs-nav { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.tab-btn { padding: 12px 22px; border-radius: 999px; border: 1px solid var(--line); background: #fff; font: inherit; font-weight: 700; cursor: pointer; color: var(--ink-2); }
.tab-btn.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.tab-pane { display: none; padding: 36px; border-radius: 26px; background: var(--bg-soft); }
.tab-pane.on { display: grid; grid-template-columns: 1.2fr 1fr; gap: 36px; }

.timeline { position: relative; max-width: 780px; margin: 0 auto; padding-left: 38px; border-left: 3px solid var(--accent-soft); }
.timeline li { position: relative; margin-bottom: 34px; }
.timeline li::before { content: ""; position: absolute; left: -49px; top: 6px; width: 18px; height: 18px; border-radius: 50%; background: var(--accent); border: 4px solid #fff; box-shadow: 0 0 0 2px var(--accent); }
.timeline h3 { margin-bottom: 6px; }

.procon .panel:first-child { background: #eefaf4; }
.procon .panel:last-child { background: #fdf0f3; }
.procon h3 { margin-bottom: 18px; }

/* responsive */
@media (max-width: 960px) {
  .hero-home .wrap, .split, .tab-pane.on { grid-template-columns: 1fr; }
  .grid-3, .removes { grid-template-columns: repeat(2, 1fr); }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento .card:nth-child(n) { grid-column: span 2; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stat-card:nth-child(n) { margin-left: 0; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .section { padding: 60px 0; }
  .burger { display: block; }
  .nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: #fff; flex-direction: column; align-items: stretch; padding: 14px 24px 20px; border-bottom: 1px solid var(--line); }
  .nav.open { display: flex; }
  .header-cta .btn { display: none; }
  .grid-3, .grid-2, .removes, .tips, .wave-compare { grid-template-columns: 1fr; }
  .cta-band { padding: 44px 24px; }
  .cmp { font-size: 0.9rem; }
  .cmp th, .cmp td { padding: 12px; }
  .footer-grid { grid-template-columns: 1fr; }
  .steps li { grid-template-columns: 1fr; }
}