:root {
  color-scheme: dark;
  --surface: #000000;
  --surface-alt: #0b0c0a;
  --signal: #00e676;
  --text: #f4f7f5;
  --muted: #969e99;
  --line: #303531;
  --font: "IBM Plex Mono", "Cascadia Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font);
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
}
button, a { font: inherit; }
a { color: inherit; }
button { color: inherit; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 4px; }

.topbar {
  min-height: 76px;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 14px; padding: 0 5vw; text-decoration: none; font-weight: 700; letter-spacing: .08em; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; background: var(--signal); color: var(--surface); }
nav { display: flex; }
nav a { display: flex; align-items: center; padding: 0 24px; border-left: 1px solid var(--line); text-decoration: none; font-size: 13px; }
nav a:hover { background: var(--signal); color: var(--surface); }

.hero { min-height: 680px; display: grid; grid-template-columns: 1.35fr .65fr; border-bottom: 1px solid var(--line); }
.hero-copy { padding: clamp(64px, 8vw, 120px) 5vw; }
.eyebrow { margin: 0 0 24px; color: var(--signal); font-size: 12px; font-weight: 700; letter-spacing: .16em; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 990px; margin-bottom: 38px; font-size: clamp(48px, 7.3vw, 118px); line-height: .91; letter-spacing: -.075em; }
h1 span { color: var(--signal); }
.hero-description { max-width: 680px; color: var(--muted); font-size: clamp(15px, 1.2vw, 19px); }
.text-link { display: inline-block; margin-top: 24px; color: var(--signal); text-underline-offset: 7px; }

.terminal { border-left: 1px solid var(--line); background: var(--surface-alt); display: flex; flex-direction: column; justify-content: flex-end; }
.terminal-head { display: flex; justify-content: space-between; padding: 18px 22px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--signal); font-size: 12px; }
.terminal-steps { list-style: none; margin: 0; padding: 0; }
.terminal-steps li { display: grid; grid-template-columns: 42px 1fr; gap: 4px 14px; padding: 24px 22px; border-bottom: 1px solid var(--line); }
.terminal-steps li > span { grid-row: 1 / 3; color: var(--signal); }
.terminal-steps small { color: var(--muted); }

.builder, .instructions { padding: clamp(70px, 8vw, 120px) 5vw; border-bottom: 1px solid var(--line); }
.section-intro { max-width: 780px; margin-bottom: 50px; }
h2 { margin-bottom: 18px; font-size: clamp(34px, 4.2vw, 68px); line-height: 1; letter-spacing: -.055em; }
.section-intro > p:last-child, .sevenzip p { color: var(--muted); }
.profiles { display: flex; flex-wrap: wrap; margin-bottom: 32px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.profile-button { min-height: 52px; padding: 0 22px; border: 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: transparent; cursor: pointer; }
.profile-button:hover, .profile-button.active { background: var(--signal); color: var(--surface); }
.profile-button.quiet { color: var(--muted); }
.builder-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(290px, 380px); gap: 40px; align-items: start; }
.app-groups { border-top: 1px solid var(--line); }
.app-group { border-bottom: 1px solid var(--line); }
.app-group h3 { margin: 0; padding: 18px 0; color: var(--muted); font-size: 12px; letter-spacing: .14em; }
.app-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.app-option { position: relative; display: flex; align-items: center; min-height: 72px; padding: 15px 18px 15px 54px; border-top: 1px solid var(--line); cursor: pointer; }
.app-option:nth-child(odd) { border-right: 1px solid var(--line); }
.app-option input { position: absolute; opacity: 0; pointer-events: none; }
.app-check { position: absolute; left: 18px; width: 18px; height: 18px; border: 1px solid var(--muted); }
.app-option input:checked + .app-check { border-color: var(--signal); background: var(--signal); box-shadow: inset 0 0 0 4px var(--surface); }
.app-option:hover { background: var(--surface-alt); }
.app-option strong { display: block; font-size: 14px; }
.app-option small { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; }
.app-option input:focus-visible ~ .app-copy { outline: 2px solid var(--signal); outline-offset: 5px; }

.selection-panel { position: sticky; top: 18px; border: 1px solid var(--signal); background: var(--surface-alt); }
.selection-label { margin: 0; padding: 15px 18px; border-bottom: 1px solid var(--signal); color: var(--signal); font-size: 12px; letter-spacing: .14em; }
.selection-count { display: flex; align-items: flex-end; gap: 17px; padding: 24px 18px; border-bottom: 1px solid var(--line); }
.selection-count strong { color: var(--signal); font-size: 78px; line-height: .8; letter-spacing: -.09em; }
.selection-count span { color: var(--muted); font-size: 12px; }
.selection-stats { margin: 0; padding: 8px 18px; }
.selection-stats div { display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.selection-stats dt { color: var(--muted); }
.selection-stats dd { margin: 0; text-align: right; }
.download-button { width: calc(100% - 36px); min-height: 58px; margin: 18px; border: 1px solid var(--signal); background: var(--signal); color: var(--surface); font-weight: 700; cursor: pointer; }
.download-button:hover { background: transparent; color: var(--signal); }
.download-button:disabled { cursor: not-allowed; opacity: .45; }
.download-note { margin: 0; padding: 0 18px 18px; color: var(--muted); font-size: 11px; }
.secondary-download { display: block; padding: 16px 18px; border-top: 1px solid var(--line); color: var(--text); text-align: center; font-size: 12px; text-underline-offset: 5px; }

.instruction-grid { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.instruction-grid li { min-height: 240px; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.instruction-grid span { color: var(--signal); font-size: 36px; }
.instruction-grid h3 { margin: 60px 0 10px; font-size: 18px; }
.instruction-grid p { color: var(--muted); font-size: 13px; }

.safety { display: grid; grid-template-columns: 1fr 1fr; gap: 6vw; padding: clamp(70px, 8vw, 120px) 5vw; border-bottom: 1px solid var(--line); background: var(--signal); color: var(--surface); }
.safety .eyebrow { color: var(--surface); }
.safety ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--surface); }
.safety li { padding: 17px 0; border-bottom: 1px solid var(--surface); }
.sevenzip { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 40px; padding: clamp(70px, 8vw, 120px) 5vw; border-bottom: 1px solid var(--line); }
.sevenzip > div { max-width: 820px; }
.outline-button { display: inline-flex; align-items: center; min-height: 56px; padding: 0 22px; border: 1px solid var(--signal); color: var(--signal); text-decoration: none; }
.outline-button:hover { background: var(--signal); color: var(--surface); }
footer { display: flex; justify-content: space-between; padding: 28px 5vw; color: var(--muted); font-size: 11px; }

@media (max-width: 900px) {
  nav { display: none; }
  .hero { grid-template-columns: 1fr; }
  .terminal { border-left: 0; border-top: 1px solid var(--line); }
  .builder-grid { grid-template-columns: 1fr; }
  .selection-panel { position: static; }
  .safety { grid-template-columns: 1fr; }
  .sevenzip { grid-template-columns: 1fr; align-items: start; }
}
@media (max-width: 600px) {
  .hero-copy, .builder, .instructions, .safety, .sevenzip { padding-left: 20px; padding-right: 20px; }
  h1 { font-size: clamp(43px, 13vw, 68px); }
  .app-list, .instruction-grid { grid-template-columns: 1fr; }
  .app-option:nth-child(odd) { border-right: 0; }
  .instruction-grid { border-left: 0; }
  .instruction-grid li { border-left: 1px solid var(--line); }
  .profiles { display: grid; grid-template-columns: 1fr 1fr; }
  .profile-button { width: 100%; }
  footer { gap: 24px; padding-left: 20px; padding-right: 20px; }
}

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