:root {
  --teal: #3aa8a4;
  --teal-deep: #1e7572;
  --teal-soft: #e7f6f5;
  --ink: #173033;
  --muted: #5d7274;
  --line: #e3eeee;
  --paper: #f5fafa;
  --white: #ffffff;
  --danger: #9a3412;
  --ok: #166534;
  --shadow: 0 18px 50px rgba(23, 48, 51, 0.08);
  --max: 1120px;
  --font: "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 6vw;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 750;
  letter-spacing: 0.08em;
}
.mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--teal);
  color: white;
  display: grid;
  place-items: center;
  font-size: 14px;
  letter-spacing: 0;
}
.brand small {
  display: block;
  letter-spacing: 0.02em;
  font-weight: 600;
  color: var(--muted);
  font-size: 11px;
}
.nav-links { display: flex; gap: 18px; align-items: center; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  font-weight: 700;
}
.btn-primary { background: var(--teal); color: white; }
.btn-primary:hover { background: var(--teal-deep); }
.btn-secondary { background: white; color: var(--ink); border-color: var(--line); }
.btn-block { width: 100%; }

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 36px;
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding: 54px 6vw 28px;
}
.kicker {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--teal-deep);
  background: var(--teal-soft);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
}
h1 {
  margin: 14px 0 6px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.02;
  letter-spacing: -0.04em;
}
.subhead {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.03em;
}
.lead { color: var(--muted); font-size: 17px; max-width: 62ch; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.spec-row { display: flex; flex-wrap: wrap; gap: 8px; }
.spec {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 14px;
  padding: 10px 12px;
  min-width: 108px;
}
.spec b { display: block; font-size: 18px; letter-spacing: -0.03em; }
.spec span { color: var(--muted); font-size: 12px; }
.voltage {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}
.voltage a, .voltage span {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--muted);
}
.voltage .on {
  background: var(--ink);
  color: white;
  border-color: var(--ink);
}
.hero-visual {
  background:
    radial-gradient(circle at 70% 40%, rgba(58, 168, 164, 0.18), transparent 46%),
    linear-gradient(180deg, #f8ffff, #eef6f6);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 18px;
  box-shadow: var(--shadow);
}
.hero-visual img { width: 100%; height: auto; }
.caption { color: var(--muted); font-size: 12px; text-align: center; margin: 4px 0 0; }

.section { padding: 54px 6vw; }
.section-alt { background: var(--paper); }
.wrap { max-width: var(--max); margin: 0 auto; }
.section h2 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.04em;
  line-height: 1.1;
}
.section .intro { color: var(--muted); max-width: 68ch; margin-bottom: 22px; }

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.card, .doc, .panel, .form {
  background: white;
  border: 1px solid var(--line);
  border-radius: 20px;
}
.card { padding: 18px; }
.card h3 { margin: 10px 0 8px; font-size: 18px; }
.card p, .doc p { margin: 0; color: var(--muted); font-size: 14px; }
.icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--teal-soft);
  color: var(--teal-deep);
  font-weight: 800;
}

.tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs button {
  border: 1px solid var(--line);
  background: white;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--ink); color: white; border-color: var(--ink); }
.panel { padding: 22px; }
.panel[hidden] { display: none; }
.panel h3 { margin-top: 0; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.pills span {
  border-radius: 999px;
  background: var(--teal-soft);
  color: var(--teal-deep);
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 700;
}
table { width: 100%; border-collapse: collapse; margin-top: 8px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { width: 34%; color: var(--muted); font-weight: 650; }

.docs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.doc { padding: 16px; display: flex; flex-direction: column; gap: 8px; min-height: 160px; }
.doc b { font-size: 16px; }
.doc a { margin-top: auto; color: var(--teal-deep); font-weight: 750; text-decoration: none; }

.inquiry {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 22px;
  align-items: start;
}
.form { padding: 20px; }
label { display: block; font-size: 13px; font-weight: 700; margin: 12px 0 6px; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 12px;
  background: white;
  color: var(--ink);
}
textarea { min-height: 110px; resize: vertical; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.check { display: flex; gap: 8px; align-items: flex-start; margin: 14px 0; font-size: 13px; color: var(--muted); }
.check input { width: auto; margin-top: 3px; }
.hp { position: absolute; left: -9999px; }
.note { min-height: 22px; font-size: 14px; }
.note.ok { color: var(--ok); }
.note.bad { color: var(--danger); }
.fine { color: var(--muted); font-size: 12px; }

.footer {
  padding: 28px 6vw 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.footer .wrap { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer a { color: var(--teal-deep); }

@media (max-width: 980px) {
  .hero, .cards, .docs, .inquiry { grid-template-columns: 1fr; }
  .nav-links a:not(.btn) { display: none; }
}
@media (max-width: 640px) {
  .row { grid-template-columns: 1fr; }
  .hero { padding-top: 28px; }
}