:root {
  color-scheme: light dark;
  --ink: #161816;
  --paper: #f7f7f3;
  --night: #0d0e0d;
  --night-2: #151817;
  --line: #343a37;
  --muted: #a7ada9;
  --green: #4bb292;
  --green-dark: #225c4a;
  --warm: #d2b96f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--night); color: #f1f1ee; font-family: Inter, Pretendard, "Segoe UI", sans-serif; letter-spacing: 0; }
a { color: inherit; }
img { display: block; max-width: 100%; }

.topbar {
  position: sticky; top: 0; z-index: 10; height: 54px; padding: 0 clamp(18px, 4vw, 56px);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  background: rgba(13, 14, 13, .94); border-bottom: 1px solid #2b302d;
  backdrop-filter: blur(12px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; white-space: nowrap; }
.brand img { width: 28px; height: 28px; }
nav { display: flex; align-items: center; gap: clamp(14px, 2.5vw, 30px); font-size: 14px; }
nav a { color: #c6cbc8; text-decoration: none; }
nav a:hover, nav a:focus-visible { color: #fff; }

.hero { position: relative; min-height: min(78svh, 760px); overflow: hidden; border-bottom: 1px solid var(--line); }
.hero-image { position: absolute; inset: 0; background: var(--night) url("/assets/bau-shell-black-v012.png") center/cover no-repeat; }
.hero::after { content: ""; position: absolute; inset: 0; background: rgba(5, 7, 6, .48); }
.hero-copy { position: relative; z-index: 1; width: min(660px, calc(100% - 36px)); padding: clamp(80px, 13vh, 150px) 0 60px; margin-left: clamp(18px, 8vw, 120px); }
.eyebrow { margin: 0 0 14px; color: var(--green); font-size: 12px; font-weight: 800; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(54px, 8vw, 102px); line-height: .94; font-weight: 760; }
.hero-copy > p:not(.eyebrow) { max-width: 600px; margin: 28px 0; color: #e0e3e0; font-size: clamp(18px, 2.1vw, 24px); line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 16px; }
.primary, .secondary, .download-small { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; padding: 0 18px; border: 1px solid transparent; text-decoration: none; font-weight: 700; }
.primary, .download-small { background: var(--green); color: #07110d; }
.primary:hover, .primary:focus-visible, .download-small:hover, .download-small:focus-visible { background: #68c4a7; }
.secondary { border-color: #8b928e; color: #fff; }
.secondary:hover, .secondary:focus-visible { border-color: #fff; }
.hero small { color: #b7bcb9; }

.feature-band { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(480px, 1.28fr); gap: clamp(36px, 7vw, 100px); align-items: center; padding: clamp(72px, 10vw, 140px) clamp(20px, 6vw, 92px); background: var(--paper); color: var(--ink); }
.feature-copy { max-width: 540px; }
h2 { margin: 0 0 20px; font-size: clamp(30px, 4vw, 52px); line-height: 1.08; }
.hero-copy > p:not(.eyebrow), h2 { word-break: keep-all; overflow-wrap: break-word; }
.feature-copy > p:not(.eyebrow) { color: #4e5551; font-size: 18px; line-height: 1.75; }
.feature-copy ul { margin: 28px 0 0; padding: 0; list-style: none; border-top: 1px solid #c9ceca; }
.feature-copy li { padding: 13px 0; border-bottom: 1px solid #c9ceca; font-weight: 650; }
figure { margin: 0; }
figure img { width: 100%; border: 1px solid #303532; box-shadow: 0 22px 70px rgba(10, 14, 12, .18); }
figcaption { margin-top: 10px; color: #69706c; font-size: 12px; }

.safety-band { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(40px, 8vw, 120px); padding: clamp(72px, 10vw, 140px) clamp(20px, 8vw, 120px); background: var(--night-2); }
.safety-band > div { max-width: 460px; }
.safety-band dl { margin: 0; border-top: 1px solid var(--line); }
.safety-band dl div { display: grid; grid-template-columns: 150px 1fr; gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); }
dt { color: var(--warm); font-weight: 750; }
dd { margin: 0; color: #c2c7c4; line-height: 1.65; }

.download-band { display: grid; grid-template-columns: auto 1fr auto; gap: 24px; align-items: center; padding: 58px clamp(20px, 8vw, 120px); background: #e8e9e3; color: var(--ink); }
.download-band img { width: 72px; height: 72px; }
.download-band h2 { margin-bottom: 8px; font-size: clamp(26px, 3vw, 40px); }
.download-band p { margin: 0; color: #59605c; }
footer { display: flex; align-items: center; gap: 24px; min-height: 78px; padding: 0 clamp(20px, 8vw, 120px); color: var(--muted); font-size: 13px; }
footer span { margin-right: auto; color: #f1f1ee; font-weight: 700; }

@media (max-width: 820px) {
  nav a:not(.download-small) { display: none; }
  .hero { min-height: 72svh; }
  .hero-copy { padding-top: 90px; margin-left: 20px; }
  .feature-band, .safety-band { grid-template-columns: 1fr; }
  .feature-band { padding-left: 20px; padding-right: 20px; }
  .safety-band dl div { grid-template-columns: 112px 1fr; gap: 18px; }
  .download-band { grid-template-columns: auto 1fr; }
  .download-band .primary { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .topbar { padding: 0 12px; }
  .brand span { font-size: 14px; }
  .download-small { padding: 0 12px; }
  h1 { font-size: 52px; }
  .hero-copy > p:not(.eyebrow) { font-size: 17px; }
  .hero::after { background: linear-gradient(180deg, rgba(5, 7, 6, .98) 0%, rgba(5, 7, 6, .97) 62%, rgba(5, 7, 6, .62) 78%, rgba(5, 7, 6, .28) 100%); }
  .safety-band dl div { grid-template-columns: 1fr; gap: 8px; }
  footer { flex-wrap: wrap; padding-top: 22px; padding-bottom: 22px; }
  footer span { width: 100%; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }