@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;700;800&family=Inter:wght@400;600;700&display=swap");

:root {
  --ink: #05070b;
  --navy: #06111f;
  --navy-deep: #030914;
  --electric: #37a8ff;
  --arctic: #56d9ff;
  --cyan: #7be0ff;
  --text: #ffffff;
  --body: #c3d7ed;
  --muted: #91aac5;
  --border: rgba(123, 224, 255, 0.28);
  --panel: rgba(4, 14, 28, 0.72);
  --grid: rgba(55, 168, 255, 0.075);
  --headline: "Avenir Next", "Inter", "Helvetica Neue", Arial, sans-serif;
  --body-font: "Inter", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", "Courier Prime", "Courier New", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    repeating-linear-gradient(0deg, transparent, transparent 37px, var(--grid) 37px, var(--grid) 38px),
    repeating-linear-gradient(90deg, transparent, transparent 37px, var(--grid) 37px, var(--grid) 38px),
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(55, 168, 255, 0.17), transparent 70%),
    linear-gradient(135deg, var(--navy-deep), #07172a 60%, #02060d);
  font-family: var(--body-font);
}
button, a { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--arctic); outline-offset: 4px; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 0 clamp(28px, 4vw, 68px);
  background: rgba(3, 9, 20, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
}
.wordmark { width: 205px; height: auto; }
.header-meta { display: flex; gap: 28px; color: var(--cyan); font: 800 11px/1 var(--mono); letter-spacing: 0.16em; }

.brief-rail {
  position: fixed;
  z-index: 10;
  top: 88px;
  bottom: 0;
  left: 0;
  width: 230px;
  padding: 32px 22px 88px;
  overflow-y: auto;
  background: rgba(3, 9, 20, 0.82);
  border-right: 1px solid var(--border);
}
.rail-top { display: grid; grid-template-columns: 1fr auto; color: var(--muted); font: 400 10px/1.4 var(--mono); letter-spacing: 0.14em; }
.rail-top b { grid-row: span 2; color: var(--cyan); font-size: 30px; line-height: 1; }
.brief-rail nav { display: grid; gap: 4px; margin-top: 30px; }
.brief-rail nav button {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 38px;
  padding: 7px 8px;
  border: 0;
  border-left: 2px solid transparent;
  background: transparent;
  cursor: pointer;
  text-align: left;
}
.brief-rail nav span, .brief-rail nav i { font: 400 10px/1.3 var(--mono); font-style: normal; letter-spacing: 0.12em; text-transform: uppercase; }
.brief-rail nav span { color: var(--muted); }
.brief-rail nav i { color: var(--body); }
.brief-rail nav button.active { border-left-color: var(--electric); background: rgba(55, 168, 255, 0.08); }
.brief-rail nav button.active span, .brief-rail nav button.active i { color: var(--cyan); }

.page-shell { width: min(1320px, calc(100% - 310px)); margin-left: max(270px, calc((100% - 1320px) / 2 + 100px)); padding: 88px 0 120px; }
.hero { position: relative; min-height: calc(100vh - 88px); display: flex; flex-direction: column; justify-content: center; padding: 92px 5vw 80px 0; }
.audience-lockup { display: flex; align-items: center; gap: 22px; width: min(560px, 72%); margin-bottom: 36px; }
.audience-lockup img { display: block; width: clamp(250px, 30vw, 390px); height: auto; opacity: 0.92; }
.audience-lockup::after { content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, rgba(123, 224, 255, 0.58), transparent); }
.eyebrow, .tactical { margin: 0; color: var(--cyan); font: 800 14px/1.3 var(--mono); letter-spacing: 0.18em; text-transform: uppercase; }
.hero h1 { max-width: 1180px; margin: 24px 0 16px; font: 700 clamp(58px, 7vw, 108px)/0.89 var(--headline); letter-spacing: -0.065em; }
.hero h1 span { color: var(--cyan); text-shadow: 0 0 40px rgba(86, 217, 255, 0.5); }
.hero-question { max-width: 980px; margin: 0; color: var(--text); font: 700 clamp(24px, 2.3vw, 36px)/1.18 var(--headline); letter-spacing: -0.035em; }
.hero-deck { max-width: 920px; margin: 14px 0 0; color: var(--body); font-size: clamp(18px, 1.45vw, 23px); line-height: 1.55; }
.live-stamp { position: absolute; top: 88px; right: 5vw; padding: 9px 13px; color: #ff4d6a; border: 2px solid #ff4d6a; font: 800 12px/1 var(--mono); letter-spacing: 0.16em; transform: rotate(-4deg); }
.hero-credit { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 40px; padding-top: 20px; border-top: 1px dotted rgba(123, 224, 255, 0.38); color: var(--muted); font: 400 10px/1.4 var(--mono); letter-spacing: 0.14em; }
.hero-credit a, .footer-contact a { color: var(--cyan); text-decoration: none; }
.hero-credit a:hover, .footer-contact a:hover { text-decoration: underline; text-underline-offset: 4px; }

.brief-list { border-top: 1px solid var(--border); }
.brief-section {
  border-bottom: 1px dotted rgba(123, 224, 255, 0.32);
  scroll-margin-top: 120px;
  transition: opacity 220ms ease, background-color 220ms ease, filter 220ms ease;
}
.brief-section.open {
  background: linear-gradient(90deg, rgba(55, 168, 255, 0.09), transparent 76%);
  box-shadow: inset 3px 0 0 var(--electric);
}
.brief-list.has-focus .brief-section:not(.open) {
  opacity: 0.26;
  filter: saturate(0.25);
}
.brief-list.has-focus .brief-section:not(.open):hover,
.brief-list.has-focus .brief-section:not(.open):focus-within {
  opacity: 0.72;
  filter: saturate(0.7);
}
.section-trigger { width: 100%; display: grid; grid-template-columns: 54px 1fr 44px; gap: 26px; align-items: start; padding: 40px 8px; border: 0; background: transparent; cursor: pointer; text-align: left; }
.section-number { color: var(--muted); font: 800 14px/1.2 var(--mono); letter-spacing: 0.12em; }
.section-heading { display: grid; gap: 8px; }
.section-heading strong { font: 700 clamp(28px, 3vw, 46px)/0.98 var(--headline); letter-spacing: -0.055em; }
.section-heading small { max-width: 760px; color: var(--muted); font-size: 16px; line-height: 1.55; }
.brief-list.has-focus .brief-section:not(.open) .section-trigger { padding-top: 23px; padding-bottom: 23px; }
.brief-list.has-focus .brief-section:not(.open) .section-heading strong { color: var(--muted); font-size: clamp(21px, 2vw, 30px); letter-spacing: -0.035em; }
.brief-list.has-focus .brief-section:not(.open) .section-heading small { display: none; }
.brief-list.has-focus .brief-section:not(.open) .tactical { font-size: 11px; }
.brief-list.has-focus .brief-section:not(.open) .toggle-mark { width: 30px; height: 30px; font-size: 18px; }
.toggle-mark { display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--border); color: var(--cyan); font: 400 23px/1 var(--mono); }
.section-panel { overflow: clip; }
.section-content { padding: 4px 80px 60px; animation: reveal 260ms ease-out both; }
@keyframes reveal { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

.content-stack { display: grid; gap: 32px; }
.lead-copy, .section-intro { max-width: 820px; margin: 0; color: var(--body); font-size: clamp(18px, 1.45vw, 22px); line-height: 1.6; }
.section-intro { color: var(--text); font-weight: 700; }
blockquote { max-width: 900px; margin: 0; padding: 20px 24px; border-left: 4px solid var(--electric); background: rgba(55, 168, 255, 0.07); color: var(--text); font: 700 clamp(23px, 2.3vw, 34px)/1.2 var(--headline); letter-spacing: -0.025em; }
.workflow { display: flex; flex-wrap: wrap; gap: 9px 13px; align-items: center; padding: 24px; border: 1px solid var(--border); background: var(--panel); }
.workflow span { display: flex; gap: 13px; align-items: center; }
.workflow b { font: 700 14px/1.3 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; }
.workflow i { color: var(--electric); font: 400 14px/1 var(--mono); font-style: normal; }
.idea-flow { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; padding: 1px; border: 1px solid var(--border); background: var(--border); }
.idea-flow span { min-height: 116px; display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; padding: 22px; background: var(--navy); }
.idea-flow b { color: var(--text); font: 700 clamp(22px, 2.4vw, 34px)/1 var(--headline); letter-spacing: -0.04em; }
.idea-flow i { color: var(--cyan); font: 700 18px/1 var(--mono); font-style: normal; }
.section-note { margin: 0; color: var(--cyan); font: 700 18px/1.45 var(--mono); letter-spacing: 0.02em; }

.split-content { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr); gap: 48px; align-items: start; }
.split-content > div { display: grid; gap: 28px; }
.signal-list { margin: 0; padding: 0; list-style: none; }
.signal-list li { position: relative; padding: 16px 16px 16px 30px; border-bottom: 1px dotted rgba(123, 224, 255, 0.3); color: var(--body); font-size: 17px; line-height: 1.5; }
.signal-list li::before { content: ">"; position: absolute; left: 4px; color: var(--cyan); font: 800 16px/1 var(--mono); }
.signal-list.compact li { padding-top: 12px; padding-bottom: 12px; }
.signal-list.two-column { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 36px; }
.equipment-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 0; padding: 1px; list-style: none; background: var(--border); border: 1px solid var(--border); }
.equipment-grid li { min-height: 90px; display: flex; align-items: flex-end; padding: 20px; background: var(--navy); color: var(--body); font-weight: 600; line-height: 1.35; }
.inside-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.sequence-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 36px; margin: 0; padding: 0; list-style: none; }
.sequence-list li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px dotted rgba(123, 224, 255, 0.3); color: var(--body); line-height: 1.45; }
.sequence-list span { color: var(--cyan); font: 800 16px/1.3 var(--mono); }
.dual-statement { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--border); background: var(--panel); }
.dual-statement span { padding: 28px; font: 700 clamp(28px, 3vw, 44px)/1 var(--headline); letter-spacing: -0.045em; text-align: center; }
.dual-statement span + span { color: var(--cyan); border-left: 1px solid var(--border); }
.comparison-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.comparison-card { padding: 32px; border: 1px solid var(--border); border-top: 3px solid var(--electric); background: var(--panel); }
.comparison-card h3 { margin: 16px 0 22px; font: 700 28px/1.1 var(--headline); letter-spacing: -0.025em; }
.question-pair { display: grid; grid-template-columns: 0.82fr 1.18fr; gap: 28px; }
.question-card { min-height: 220px; padding: 32px; border: 1px solid var(--border); background: var(--panel); }
.question-card > p:last-child { margin: 28px 0 0; font: 700 clamp(25px, 2.6vw, 40px)/1.1 var(--headline); letter-spacing: -0.04em; }
.signal-question { border-color: rgba(123, 224, 255, 0.62); }
.closing-lines { grid-column: 1 / -1; padding: 34px 0 0; border-top: 1px dotted rgba(123, 224, 255, 0.38); }
.closing-lines p { color: var(--body); font-size: 20px; }
.closing-lines strong { display: block; margin-top: 12px; color: var(--cyan); font-size: clamp(27px, 3vw, 44px); }
.audit-panel { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: center; padding: 36px; border: 1px solid var(--border); background: var(--panel); }
.audit-panel > div { display: grid; gap: 16px; }
.primary-action { min-height: 56px; display: inline-flex; align-items: center; justify-content: center; padding: 0 26px; border: 1px solid var(--cyan); background: linear-gradient(180deg, var(--cyan), var(--electric)); box-shadow: 0 0 24px rgba(55, 168, 255, 0.22); color: var(--ink); font: 800 12px/1 var(--mono); letter-spacing: 0.13em; text-decoration: none; text-transform: uppercase; }

footer { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; padding: 72px 0 24px; color: var(--muted); font: 400 10px/1.4 var(--mono); letter-spacing: 0.14em; }
.footer-brand, .footer-contact { display: grid; gap: 10px; }
.footer-brand { grid-template-columns: auto 1fr; align-items: center; gap: 16px; }
footer img { width: 28px; height: auto; }
.footer-contact { justify-items: end; text-align: right; letter-spacing: 0.06em; }
.footer-contact strong { color: var(--text); font-weight: 700; }
.presenter-controls { position: fixed; z-index: 30; right: 26px; bottom: 22px; display: flex; align-items: center; gap: 2px; padding: 4px; border: 1px solid var(--border); background: rgba(3, 9, 20, 0.94); backdrop-filter: blur(14px); }
.presenter-controls button, .presenter-controls span { min-height: 38px; display: inline-flex; align-items: center; padding: 0 14px; border: 0; background: transparent; color: var(--body); font: 800 10px/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; }
.presenter-controls button { cursor: pointer; }
.presenter-controls button:hover:not(:disabled) { background: rgba(55, 168, 255, 0.09); color: var(--cyan); }
.presenter-controls button:disabled { opacity: 0.35; cursor: not-allowed; }
.presenter-controls span { border-right: 1px solid var(--border); border-left: 1px solid var(--border); color: var(--cyan); }

@media (max-width: 980px) {
  .header-meta span:last-child { display: none; }
  .brief-rail { display: none; }
  .page-shell { width: min(100% - 48px, 920px); margin: 0 auto; }
  .hero { padding-right: 0; }
  .inside-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
  .site-header { height: 72px; padding: 0 24px; }
  .wordmark { width: 180px; }
  .header-meta { display: none; }
  .page-shell { width: calc(100% - 40px); padding-top: 72px; }
  .hero { min-height: calc(100vh - 72px); padding: 84px 0 64px; }
  .audience-lockup { width: 76%; margin-bottom: 30px; }
  .audience-lockup img { width: min(270px, 100%); }
  .audience-lockup::after { display: none; }
  .hero h1 { font-size: clamp(48px, 15vw, 66px); }
  .hero-question { font-size: clamp(25px, 7vw, 34px); }
  .live-stamp { top: 30px; right: 0; }
  .hero-credit { display: grid; gap: 10px; }
  .section-trigger { grid-template-columns: 36px 1fr 36px; gap: 14px; padding: 30px 0; }
  .section-heading strong { font-size: clamp(30px, 9vw, 42px); }
  .section-heading small { font-size: 15px; }
  .section-content { padding: 0 0 48px; }
  .split-content, .comparison-grid, .question-pair, .audit-panel { grid-template-columns: 1fr; }
  .signal-list.two-column, .sequence-list, .equipment-grid, .inside-grid { grid-template-columns: 1fr; }
  .idea-flow { grid-template-columns: 1fr; }
  .idea-flow span { min-height: 82px; }
  .dual-statement { grid-template-columns: 1fr; }
  .dual-statement span + span { border-top: 1px solid var(--border); border-left: 0; }
  .question-card { min-height: auto; }
  .audit-panel { padding: 28px; gap: 28px; }
  .primary-action { width: 100%; }
  footer { align-items: stretch; flex-direction: column; padding-bottom: 96px; }
  .footer-contact { justify-items: start; text-align: left; }
  .presenter-controls { right: 12px; bottom: 12px; left: 12px; justify-content: space-between; }
  .presenter-controls button, .presenter-controls span { padding: 0 10px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .section-content { animation: none; }
  .brief-section { transition: none; }
}