:root {
  --ink: #11110f;
  --paper: #f1efe7;
  --paper-2: #e7e3d7;
  --line: rgba(17, 17, 15, .18);
  --muted: #76736b;
  --accent: #b8ff3d;
  --accent-ink: #11110f;
  --display: "Big Shoulders Display", sans-serif;
  --sans: "Geist", sans-serif;
  --mono: "Geist Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, textarea { font: inherit; }

.concept-nav {
  height: 72px;
  padding: 0 clamp(18px, 3vw, 48px);
  display: flex;
  align-items: center;
  gap: 36px;
  color: #f7f6ef;
  background: var(--ink);
  border-bottom: 1px solid rgba(255,255,255,.14);
}
.concept-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.concept-brand img { width: 30px; height: 30px; border-radius: 50%; }
.concept-links { display: flex; align-items: center; gap: 26px; margin-left: auto; font-size: 14px; color: rgba(255,255,255,.68); }
.concept-links a:hover { color: #fff; }
.nav-action {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 8px 8px 17px;
  border-radius: 999px;
  color: var(--accent-ink);
  background: var(--accent);
  font-weight: 700;
  font-size: 14px;
}
.nav-action span { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--ink); color: #fff; font-size: 9px; }

.concept-hero {
  min-height: calc(100svh - 72px);
  display: grid;
  grid-template-columns: minmax(390px, .88fr) minmax(520px, 1.12fr);
  color: #f7f6ef;
  background: var(--ink);
  overflow: hidden;
}
.hero-copy {
  position: relative;
  z-index: 2;
  padding: clamp(54px, 7vw, 112px) clamp(28px, 5vw, 86px) 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-right: 1px solid rgba(255,255,255,.14);
}
.concept-tag, .section-label {
  margin: 0 0 30px;
  font: 600 12px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.concept-tag { color: rgba(255,255,255,.68); }
.concept-tag span { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 16px var(--accent); }
h1, h2 { font-family: var(--display); text-transform: uppercase; letter-spacing: -.025em; }
h1 { max-width: 720px; margin: 0; font-size: clamp(64px, 7.1vw, 124px); line-height: .82; font-weight: 800; }
.hero-route { margin: 38px 0 7px; color: var(--accent); font: 700 clamp(25px, 2vw, 34px)/1.05 var(--display); text-transform: uppercase; }
.hero-description { max-width: 580px; margin: 0; color: rgba(255,255,255,.72); font-size: clamp(16px, 1.3vw, 20px); line-height: 1.5; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.primary-action, .secondary-action {
  min-height: 54px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  border-radius: 3px;
  font-weight: 700;
}
.primary-action { color: var(--accent-ink); background: var(--accent); }
.secondary-action { border: 1px solid rgba(255,255,255,.28); color: #fff; }
.hero-metrics { margin-top: auto; padding-top: 50px; display: grid; grid-template-columns: auto auto 1fr; gap: clamp(20px, 3vw, 54px); align-items: end; }
.hero-metrics div { display: flex; flex-direction: column; }
.hero-metrics strong { font: 800 clamp(34px, 3vw, 54px)/.9 var(--display); }
.hero-metrics span, .hero-metrics p { color: rgba(255,255,255,.48); font-size: 11px; line-height: 1.4; }
.hero-metrics p { margin: 0 0 2px; text-align: right; }

.sound-stage { position: relative; min-height: 650px; isolation: isolate; overflow: hidden; background: #050505; }
#ribbon-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; transition: filter .6s ease; }
.stage-shade { position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, rgba(0,0,0,.12), transparent 48%, rgba(0,0,0,.7)); pointer-events: none; }
.stage-copy { position: absolute; z-index: 2; top: 9%; left: 7%; right: 7%; }
.stage-copy span { color: rgba(255,255,255,.54); font: 600 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.stage-copy strong { display: block; margin-top: 8px; font: 800 clamp(72px, 10vw, 168px)/.8 var(--display); text-transform: uppercase; letter-spacing: -.025em; }
.stage-copy p { max-width: 430px; margin: 22px 0 0; color: rgba(255,255,255,.6); font-size: 13px; }
.route-switcher {
  position: absolute;
  z-index: 3;
  left: 5%; right: 5%; bottom: 28px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid rgba(255,255,255,.22);
  background: rgba(8,8,8,.62);
  backdrop-filter: blur(18px);
}
.route-switcher button {
  min-height: 76px;
  padding: 13px 14px;
  border: 0;
  border-right: 1px solid rgba(255,255,255,.16);
  color: rgba(255,255,255,.62);
  background: transparent;
  cursor: pointer;
  text-align: left;
  font: 700 15px/1.05 var(--display);
  text-transform: uppercase;
}
.route-switcher button:last-child { border-right: 0; }
.route-switcher button span { display: block; margin-bottom: 11px; color: rgba(255,255,255,.34); font: 500 10px/1 var(--mono); }
.route-switcher button.is-active { color: var(--accent-ink); background: var(--accent); }
.route-switcher button.is-active span { color: rgba(0,0,0,.5); }

.proof-section, .picker-section, .system-section { padding: clamp(74px, 9vw, 136px) clamp(20px, 4vw, 64px); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 38px; }
.section-label { margin-bottom: 14px; color: var(--muted); }
h2 { margin: 0; font-size: clamp(54px, 7vw, 108px); line-height: .88; }
.section-heading > a { padding-bottom: 8px; border-bottom: 1px solid var(--ink); font-weight: 700; }
.proof-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.proof-card { position: relative; min-width: 0; overflow: hidden; background: #d7d2c4; transition: transform .25s ease, box-shadow .25s ease; }
.proof-card:hover { transform: translateY(-8px); box-shadow: 0 22px 40px rgba(22,19,12,.15); }
.proof-card img { display: block; width: 100%; aspect-ratio: 9/13; object-fit: cover; filter: saturate(.88); transition: transform .45s ease, filter .25s ease; }
.proof-card:hover img { transform: scale(1.025); filter: saturate(1.08); }
.proof-card div { position: absolute; inset: auto 0 0; padding: 68px 18px 18px; display: flex; flex-direction: column; color: #fff; background: linear-gradient(transparent, rgba(0,0,0,.88)); }
.proof-card strong { font: 800 clamp(38px, 4vw, 64px)/.85 var(--display); }
.proof-card span { margin-top: 8px; font-weight: 700; }
.proof-card small { margin-top: 3px; color: rgba(255,255,255,.64); }
.proof-note { max-width: 640px; margin: 22px 0 0; color: var(--muted); font-size: 13px; }

.picker-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(40px, 8vw, 130px); background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.picker-intro > p:not(.section-label) { max-width: 510px; color: #5d5a53; font-size: 18px; line-height: 1.55; }
.agent-note { margin-top: 52px; padding-top: 18px; display: flex; flex-direction: column; gap: 8px; border-top: 1px solid var(--line); font-size: 13px; }
.agent-note span { color: var(--muted); }
.agent-note a { font-weight: 700; }
.picker-panel { padding: clamp(24px, 4vw, 52px); color: #fff; background: var(--ink); }
.picker-panel label { display: block; margin-bottom: 13px; color: rgba(255,255,255,.58); font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.picker-panel textarea { width: 100%; min-height: 146px; padding: 18px; resize: vertical; border: 1px solid rgba(255,255,255,.22); border-radius: 0; outline: 0; color: #fff; background: rgba(255,255,255,.045); font-size: 17px; line-height: 1.5; }
.picker-panel textarea:focus { border-color: var(--accent); }
.thinking-action { position: relative; width: 100%; min-height: 58px; margin-top: 12px; border: 0; color: var(--accent-ink); background: var(--accent); cursor: pointer; font-weight: 800; overflow: hidden; }
.thinking-action::after { content: ""; position: absolute; left: -35%; top: 0; width: 30%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255,255,255,.75), transparent); transform: skewX(-18deg); opacity: 0; }
.thinking-action.is-thinking::after { opacity: 1; animation: thinking-sweep .72s linear infinite; }
@keyframes thinking-sweep { to { left: 110%; } }
.picker-status { min-height: 18px; margin: 12px 0 0; color: rgba(255,255,255,.46); font-size: 12px; }
.picker-result { margin-top: 30px; padding-top: 25px; border-top: 1px solid rgba(255,255,255,.16); }
.picker-result small { color: rgba(255,255,255,.48); font: 600 11px/1 var(--mono); text-transform: uppercase; }
.picker-result strong { display: block; margin-top: 8px; color: var(--accent); font: 800 clamp(54px, 6vw, 94px)/.85 var(--display); text-transform: uppercase; }
.picker-result p { max-width: 640px; margin: 18px 0 0; color: rgba(255,255,255,.74); }
.picker-result .edit-cue { color: rgba(255,255,255,.48); font-size: 13px; }
.picker-result a { margin-top: 25px; min-height: 50px; padding: 0 17px; display: inline-flex; align-items: center; gap: 28px; color: var(--accent-ink); background: var(--accent); font-weight: 800; }

.system-section { color: #fff; background: var(--ink); }
.system-section { display: grid; grid-template-columns: .65fr 1.35fr; gap: 60px; align-items: end; }
.system-section h2 { max-width: 580px; font-size: clamp(52px, 6vw, 92px); }
.system-flow { grid-column: 2; display: grid; grid-template-columns: auto 1fr auto 1fr auto 1fr auto; align-items: center; gap: 14px; }
.system-flow span { padding: 14px 16px; border: 1px solid rgba(255,255,255,.18); font-size: 12px; white-space: nowrap; }
.system-flow i { display: block; height: 1px; background: linear-gradient(90deg, var(--accent), rgba(255,255,255,.16)); }
.system-links { grid-column: 2; display: flex; gap: 26px; }
.system-links a { border-bottom: 1px solid rgba(255,255,255,.4); font-weight: 700; }
.concept-footer { padding: 30px clamp(20px, 4vw, 64px); display: flex; align-items: center; gap: 20px; border-top: 1px solid var(--line); }
.concept-footer strong { font-size: 18px; }
.concept-footer span { color: var(--muted); font-size: 13px; }
.concept-footer a { margin-left: auto; font-weight: 700; font-size: 13px; }

body[data-route="product"] { --accent: #ff6847; }
body[data-route="presentation"] { --accent: #69e6b2; }
body[data-route="core"] { --accent: #ffd438; }

@media (max-width: 980px) {
  .concept-links { display: none; }
  .concept-hero { grid-template-columns: 1fr; }
  .hero-copy { min-height: auto; padding-bottom: 46px; border-right: 0; }
  .hero-metrics { margin-top: 30px; }
  .sound-stage { min-height: 560px; }
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .picker-section, .system-section { grid-template-columns: 1fr; }
  .system-flow, .system-links { grid-column: 1; }
}

@media (max-width: 620px) {
  .concept-nav { height: 62px; padding-inline: 14px; }
  .concept-brand span { display: none; }
  .concept-brand img { width: 34px; height: 34px; }
  .nav-action { margin-left: auto; }
  .concept-hero { min-height: auto; }
  .hero-copy { padding: 50px 18px 34px; }
  h1 { font-size: clamp(60px, 20vw, 88px); }
  .hero-route { margin-top: 28px; }
  .hero-description { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions a { width: 100%; }
  .hero-metrics { grid-template-columns: 1fr 1fr; }
  .hero-metrics p { grid-column: 1 / -1; text-align: left; }
  .sound-stage { min-height: 500px; }
  .stage-copy { top: 10%; }
  .stage-copy strong { font-size: 25vw; }
  .route-switcher { left: 14px; right: 14px; bottom: 14px; grid-template-columns: 1fr 1fr; }
  .route-switcher button { min-height: 64px; }
  .route-switcher button:nth-child(2) { border-right: 0; }
  .route-switcher button:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.16); }
  .proof-section, .picker-section, .system-section { padding: 70px 16px; }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .proof-grid { grid-template-columns: 1fr 1fr; gap: 7px; }
  .proof-card div { padding: 50px 10px 11px; }
  .proof-card strong { font-size: 36px; }
  .proof-card span { font-size: 12px; overflow: hidden; text-overflow: ellipsis; }
  .proof-card small { font-size: 9px; }
  .picker-section { gap: 36px; }
  .picker-panel { padding: 22px 16px; }
  .agent-note { margin-top: 30px; }
  .system-flow { grid-template-columns: 1fr; gap: 8px; }
  .system-flow i { width: 1px; height: 18px; margin-left: 20px; background: linear-gradient(var(--accent), rgba(255,255,255,.16)); }
  .system-flow span { white-space: normal; }
  .concept-footer { align-items: flex-start; flex-direction: column; }
  .concept-footer a { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}