:root {
  --teal: #4eaaa4;
  --teal-deep: #2f7f7a;
  --teal-bright: #7fd0cb;
  --navy: #07111c;
  --navy-2: #0c1a2b;
  --panel: #102033;
  --ink: #f3f7f8;
  --muted: #b4c3c9;
  --line: rgba(232, 242, 244, 0.14);
  --danger: #ffb4a2;
  --ok: #b7ebc6;
  --shadow: 0 24px 60px rgba(2, 8, 16, 0.45);
  --max: 1180px;
  --font: "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
section[id], .hero { scroll-margin-top: 84px; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 480px at 88% 0%, rgba(78, 170, 164, 0.16), transparent 58%),
    var(--navy);
  font-family: var(--font);
  font-size: 16.5px;
  line-height: 1.65;
  font-weight: 450;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible {
  outline: 2px solid var(--teal-bright);
  outline-offset: 3px;
}
.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 40;
  background: var(--teal);
  color: var(--navy);
  padding: 8px 12px;
  text-decoration: none;
  font-weight: 700;
}
.skip:focus { top: 12px; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 5vw;
  background: rgba(7, 17, 28, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; text-decoration: none; }
.brand img { height: 52px; width: auto; }
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a {
  text-decoration: none;
  color: #d5e2e6;
  font-size: 14px;
  font-weight: 500;
}
.nav-links a:hover { color: white; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 4px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background 200ms ease, border-color 200ms ease, transform 200ms ease, color 200ms ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(1px) scale(0.98); }
.btn:disabled { opacity: 0.6; cursor: wait; transform: none; }
.btn-primary { background: var(--teal); color: #06201e; }
.btn-primary:hover { background: var(--teal-bright); }
.btn-secondary { background: transparent; color: white; border-color: rgba(255, 255, 255, 0.28); }
.btn-secondary:hover { border-color: white; background: rgba(255, 255, 255, 0.04); }
.btn-block { width: 100%; }

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px 48px;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  padding: 42px 5vw 18px;
}
.kicker {
  color: var(--teal-bright);
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
h1 {
  margin: 12px 0 8px;
  font-size: clamp(40px, 5.4vw, 68px);
  line-height: 0.96;
  letter-spacing: -0.045em;
  font-weight: 700;
  text-wrap: balance;
}
.subhead {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.03em;
  font-weight: 550;
  color: #d7e4e8;
  text-wrap: balance;
}
.lead { color: var(--muted); font-size: 17px; max-width: 62ch; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 8px; }
.spec-row {
  display: grid;
  grid-template-columns: 0.85fr 0.9fr 0.7fr 1.15fr;
  margin-top: 22px;
  border-top: 1px solid var(--line);
}
.spec { padding: 14px 10px 14px 0; background: transparent; min-width: 0; }
.spec + .spec { padding-left: 14px; box-shadow: inset 1px 0 0 var(--line); }
.spec b {
  display: block;
  font-size: clamp(18px, 1.7vw, 26px);
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  white-space: nowrap;
}
.spec span { color: var(--muted); font-size: 12px; letter-spacing: 0.04em; }
.voltage { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.voltage a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 650;
  color: #d5e2e6;
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease;
}
.voltage a:hover { border-color: var(--teal); color: white; }
.voltage .on { background: var(--teal); color: #06201e; border-color: var(--teal); }
.fine { color: var(--muted); font-size: 13px; max-width: 62ch; }
.hero-visual {
  margin: 0;
  min-height: 460px;
  display: grid;
  align-items: end;
  background:
    radial-gradient(circle at 50% 42%, rgba(78, 170, 164, 0.2), transparent 46%),
    linear-gradient(180deg, transparent, rgba(7, 17, 28, 0.2));
}
.hero-visual img {
  width: min(100%, 520px);
  margin: 0 auto;
  filter: drop-shadow(0 30px 40px rgba(0, 0, 0, 0.35));
}
.caption { color: var(--muted); font-size: 12px; text-align: center; margin: 8px 0 0; }

.section { padding: 72px 5vw 64px; }
.section-alt { background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0.015)); }
.wrap { max-width: var(--max); margin: 0 auto; }
.section h2, main h1 {
  margin: 0 0 10px;
  font-size: clamp(32px, 4vw, 48px);
  letter-spacing: -0.045em;
  line-height: 1.05;
  font-weight: 700;
  text-wrap: balance;
}
.section .intro, main .lead { color: var(--muted); max-width: 66ch; }

.why-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) 1.28fr;
  gap: 36px 64px;
  align-items: start;
}
.features article {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 8px 18px;
  padding: 22px 0 24px;
  border-top: 1px solid var(--line);
}
.features article:last-child { border-bottom: 1px solid var(--line); }
.num {
  color: var(--teal-bright);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  padding-top: 4px;
}
.features h3 { margin: 0 0 6px; font-size: 20px; letter-spacing: -0.03em; }
.features p, .doc p { margin: 0; color: var(--muted); }

.param-layout {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  gap: 28px;
  align-items: start;
}
.tabs { display: flex; gap: 8px; margin: 0 0 14px; flex-wrap: wrap; }
.tabs button {
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 4px;
  padding: 8px 14px;
  cursor: pointer;
  color: #d5e2e6;
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease;
}
.tabs button:hover { border-color: var(--teal); }
.tabs button[aria-selected="true"] { background: var(--teal); color: #06201e; border-color: var(--teal); }
.panel { padding: 4px 0 8px; }
.panel[hidden] { display: none; }
.panel h3 { margin: 0 0 8px; font-size: 22px; letter-spacing: -0.03em; }
.panel p { color: var(--muted); margin: 0; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pills span {
  border-radius: 4px;
  border: 1px solid rgba(127, 208, 203, 0.35);
  color: var(--teal-bright);
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.sheet {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
table { width: 100%; border-collapse: collapse; }
th, td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
tr:last-child th, tr:last-child td { border-bottom: 0; }
th { width: 38%; color: var(--muted); font-weight: 600; }
td { font-variant-numeric: tabular-nums; }

.docs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 48px;
}
.doc {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 18px 0 20px;
  border-top: 1px solid var(--line);
}
.doc b { font-size: 17px; }
.doc p { font-size: 14px; max-width: 46ch; }
.doc a {
  color: var(--teal-bright);
  font-weight: 700;
  text-decoration: none;
}
.doc a:hover { text-decoration: underline; }

.inquiry {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 36px;
  align-items: start;
}
.contact-card { color: var(--muted); }
.contact-card b { color: var(--ink); }
.contact-card a { color: var(--teal-bright); }
.form {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  box-shadow: var(--shadow);
}
label { display: block; font-size: 13px; font-weight: 650; margin: 14px 0 6px; }
input, select, textarea {
  width: 100%;
  border: 1px solid rgba(232, 242, 244, 0.18);
  border-radius: 4px;
  padding: 12px;
  background: #0b1726;
  color: white;
}
input:focus, select:focus, textarea:focus { border-color: var(--teal); }
textarea { min-height: 120px; resize: vertical; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 16px 0;
  font-size: 13px;
  font-weight: 450;
  color: var(--muted);
}
.check input { width: auto; margin-top: 3px; }
.check a { color: var(--teal-bright); }
.hp { position: absolute; left: -9999px; }
.note { min-height: 22px; font-size: 14px; }
.note.ok { color: var(--ok); }
.note.bad { color: var(--danger); }

.footer {
  padding: 28px 5vw 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.footer .wrap { display: flex; justify-content: space-between; gap: 18px; align-items: center; flex-wrap: wrap; }
.footer .brand img { height: 42px; }
.footer a { color: var(--teal-bright); }
.footer p { max-width: 78ch; }

.chooser { min-height: 100dvh; display: grid; align-items: center; }
.chooser .actions { margin-top: 28px; }

@media (max-width: 980px) {
  .hero, .why-grid, .param-layout, .inquiry, .docs { grid-template-columns: 1fr; }
  .nav-links a:not(.btn) { display: none; }
  .hero-visual { min-height: 0; }
  .doc:last-child { border-bottom: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .row, .spec-row { grid-template-columns: 1fr 1fr; }
  .spec + .spec { box-shadow: none; }
  .spec:nth-child(even) { padding-left: 16px; box-shadow: inset 1px 0 0 var(--line); }
  .hero { padding-top: 28px; }
  .section { padding: 48px 5vw 40px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}