:root {
  --bg: #090b0d;
  --surface: #111418;
  --surface-2: #15191e;
  --surface-3: #1a1f25;
  --ink: #f3f4ef;
  --muted: #9aa1a8;
  --line: #2a3037;
  --line-strong: #3a424b;
  --accent: #c9f45b;
  --accent-ink: #0b0d0f;
  --danger: #ff8e7a;
  --warning: #f1c96a;
  --ok: #84d99a;
  --max: 1440px;
  --mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", ui-monospace, monospace;
  --sans: "Avenir Next", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

a { color: inherit; }

button,
input { font: inherit; }

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* TOPBAR */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  min-height: 66px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 clamp(20px, 4vw, 64px);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand,
.nav,
.status {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
}

.brand-mark {
  width: 13px;
  height: 13px;
  border: 2px solid var(--accent);
  box-shadow: inset 4px 0 0 var(--bg), inset -4px 0 0 var(--bg);
}

.nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
}

.nav a {
  text-decoration: none;
  transition: color 140ms ease;
}

.nav a:hover { color: var(--ink); }

.status {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent);
}

main { overflow: clip; }

.hero,
.section,
footer {
  width: min(var(--max), calc(100% - clamp(40px, 8vw, 128px)));
  margin: 0 auto;
}

/* HERO */
.hero {
  min-height: calc(100dvh - 66px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(84px, 10vw, 148px) 0 48px;
}

.hero-kicker,
.eyebrow,
.step-label,
.metric-label,
.system-node > span,
.operator-rule-key,
.preset-label,
.job-card-no,
.timeline-time {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-kicker {
  margin-bottom: 32px;
  color: var(--accent);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, .55fr);
  gap: clamp(52px, 8vw, 140px);
  align-items: end;
}

.hero h1 {
  margin: 0;
  max-width: 13ch;
  font-size: clamp(48px, 7.2vw, 108px);
  line-height: .93;
  letter-spacing: -.055em;
  font-weight: 620;
}

.hero-turn {
  margin: 28px 0 0;
  max-width: 32ch;
  font-size: clamp(20px, 2.2vw, 30px);
  line-height: 1.2;
  letter-spacing: -.03em;
  color: var(--accent);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 36px;
}

.hero-actions .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  text-decoration: none;
}

.button {
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  min-height: 40px;
  padding: 0 16px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .05em;
  transition: transform 120ms ease, border-color 120ms ease, color 120ms ease, background 120ms ease;
}

.button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.button:active { transform: translateY(1px); }

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
}

.button.primary:hover {
  background: color-mix(in srgb, var(--accent) 85%, #fff);
  color: var(--accent-ink);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.button.secondary {
  border-color: var(--line-strong);
  color: var(--ink);
}

.text-link {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
  text-underline-offset: 5px;
}

.text-link:hover { color: var(--ink); }

.hero-note {
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
  color: var(--muted);
  font-size: 15px;
  max-width: 39ch;
}

.hero-note p { margin: 0 0 14px; }

.hero-note p:first-child {
  color: var(--ink);
  font-weight: 700;
}

.principle-strip {
  margin-top: clamp(64px, 8vw, 120px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.principle-strip span {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  border-right: 1px solid var(--line);
}

.principle-strip span:first-child { padding-left: 0; }
.principle-strip span:last-child { border-right: 0; }
.principle-strip b { color: var(--accent); }

/* SECTIONS */
.section {
  padding: clamp(88px, 9vw, 140px) 0;
  border-top: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, .55fr);
  gap: 60px;
  align-items: end;
  margin-bottom: 48px;
}

.section-head.compact-head {
  margin-bottom: 32px;
}

.section-head h2,
.proof-lead h2 {
  margin: 10px 0 0;
  font-size: clamp(34px, 4.4vw, 64px);
  line-height: .98;
  letter-spacing: -.045em;
  font-weight: 620;
  max-width: 14ch;
}

.section-head > p,
.proof-lead > p {
  margin: 0;
  color: var(--muted);
  max-width: 50ch;
  font-size: 16px;
  line-height: 1.5;
}

/* SECTION 01: JOB GRID */
.job-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
  background: var(--surface);
}

.job-card {
  padding: 32px 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.job-card:nth-child(3n) { border-right: 0; }
.job-card:nth-child(n+4) { border-bottom: 0; }

.job-card-no {
  display: block;
  color: var(--accent);
  font-size: 11px;
  margin-bottom: 20px;
}

.job-card h3 {
  margin: 0 0 12px;
  font-size: 20px;
  letter-spacing: -.025em;
  font-weight: 600;
}

.job-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

/* SECTION 02: THE PLAYER TIMELINE */
.timeline-card {
  border: 1px solid var(--line);
  background: var(--surface);
  margin-bottom: 64px;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
}

.timeline-header h3 {
  margin: 4px 0 0;
  font-size: 22px;
  letter-spacing: -.02em;
}

.timeline-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
}

.timeline-step {
  padding: 28px 26px;
  border-right: 1px solid var(--line);
  position: relative;
}

.timeline-step:last-child { border-right: 0; }

.timeline-step.active-step {
  background: color-mix(in srgb, var(--accent) 3%, var(--surface));
  border-bottom: 2px solid var(--accent);
}

.timeline-step h4 {
  margin: 12px 0 8px;
  font-size: 17px;
  letter-spacing: -.02em;
}

.timeline-step p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.timeline-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 4px 8px;
  border: 1px solid var(--line-strong);
  color: var(--muted);
}

.timeline-tag.positive-tag { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 35%, var(--line)); }
.timeline-tag.warning-tag { color: var(--warning); border-color: color-mix(in srgb, var(--warning) 35%, var(--line)); }
.timeline-tag.negative-tag { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 35%, var(--line)); }

.timeline-callout {
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  align-items: center;
  background: color-mix(in srgb, var(--accent) 4%, var(--surface-2));
}

.timeline-callout p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.timeline-callout strong { color: var(--ink); }

.dataset-intro {
  margin-top: 48px;
}

/* DATASET PREVIEW */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-left: 0;
  border-right: 0;
  margin-bottom: 36px;
}

.metric {
  padding: 24px 22px;
  border-right: 1px solid var(--line);
  min-width: 0;
}

.metric:first-child { padding-left: 0; }
.metric:last-child { border-right: 0; }

.metric strong {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: clamp(26px, 3vw, 42px);
  letter-spacing: -.05em;
  font-weight: 500;
}

.metric small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.base-layout {
  display: grid;
  grid-template-columns: .55fr 1.45fr;
  gap: 24px;
  align-items: start;
}

.segment-list {
  border-top: 1px solid var(--line);
}

.segment-row {
  width: 100%;
  display: grid;
  grid-template-columns: 18px 1fr auto;
  gap: 14px;
  align-items: center;
  min-height: 62px;
  padding: 12px 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  cursor: pointer;
}

.segment-row:hover .segment-name { color: var(--accent); }

.segment-row.active-segment {
  background: color-mix(in srgb, var(--accent) 4%, transparent);
  padding-left: 10px;
  border-left: 2px solid var(--accent);
}

.segment-row.active-segment .segment-name {
  color: var(--accent);
}

.segment-index {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
}

.segment-name {
  font-weight: 650;
  transition: color 140ms ease;
}

.segment-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}

.segment-bar {
  width: 64px;
  height: 3px;
  background: var(--surface-3);
  position: relative;
}

.segment-bar i {
  display: block;
  height: 100%;
  background: var(--accent);
}

.dataset-panel,
.player-card,
.decision-path,
.control-panel,
.experiment-result,
.event-contract,
.failure-panel,
.contact-card {
  border: 1px solid var(--line);
  background: var(--surface);
}

.dataset-panel { min-width: 0; }

.panel-topline,
.result-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: start;
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
}

.panel-topline h3,
.result-head h3,
.system-node h3,
.failure-panel h3,
.contact-header h3 {
  margin: 5px 0 0;
  font-size: 20px;
  letter-spacing: -.025em;
}

.table-wrap { overflow-x: auto; }

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 760px;
  font-size: 13px;
}

th,
td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}

th {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .07em;
  text-transform: uppercase;
}

td:first-child,
td:nth-child(3),
td:nth-child(4),
td:nth-child(5),
td:nth-child(6) {
  font-family: var(--mono);
}

.table-note,
.method-note,
.proof-footnote {
  color: var(--muted);
  font-size: 12px;
  padding: 14px 18px;
  line-height: 1.5;
}

/* SECTION 03: DECISION SHELL */
.decision-section { position: relative; }

.decision-shell {
  display: grid;
  grid-template-columns: .45fr .75fr 1.15fr;
  gap: 18px;
  align-items: stretch;
}

.scenario-rail { border-top: 1px solid var(--line); }

.scenario-button {
  width: 100%;
  min-height: 84px;
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 14px;
  align-items: center;
  padding: 14px 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}

.scenario-button:hover,
.scenario-button[aria-pressed="true"] { color: var(--ink); }

.scenario-button[aria-pressed="true"] .scenario-no { color: var(--accent); }

.scenario-button strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}

.scenario-button small {
  display: block;
  color: var(--muted);
  line-height: 1.35;
}

.scenario-no {
  align-self: start;
  padding-top: 2px;
  font-family: var(--mono);
  font-size: 10px;
}

.player-card {
  display: flex;
  flex-direction: column;
}

.state-chip,
.confidence-chip {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .06em;
  border: 1px solid var(--line-strong);
  padding: 6px 9px;
  color: var(--accent);
}

.player-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  padding: 10px 24px 22px;
}

.fact {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.fact:nth-child(odd) { padding-right: 18px; }
.fact:nth-child(even) { padding-left: 18px; border-left: 1px solid var(--line); }

.fact span {
  display: block;
  color: var(--muted);
  font-size: 11px;
}

.fact strong {
  display: block;
  margin-top: 4px;
  font-family: var(--mono);
  font-size: 15px;
}

.signal-box {
  margin: auto 24px 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
}

.signal-box p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.45;
}

.decision-path { padding: 8px 28px; }

.path-step {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 15px;
  padding: 18px 0;
}

.step-no {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10px;
}

.path-step h3 {
  margin: 4px 0 5px;
  font-size: 17px;
}

.path-step p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  max-width: 62ch;
  line-height: 1.45;
}

.path-line {
  width: 1px;
  height: 16px;
  background: var(--line-strong);
  margin-left: 13px;
}

.operator-rule {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  align-items: center;
  padding: 20px 24px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  background: color-mix(in srgb, var(--accent) 3%, var(--surface));
}

.operator-rule-key { color: var(--accent); }
.operator-rule p { margin: 0; color: var(--muted); font-size: 14px; }
.operator-rule strong { color: var(--ink); }

/* SECTION 04: EXPERIMENT ECONOMICS */
.preset-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.preset-btn {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 8px 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .05em;
  cursor: pointer;
  transition: all 120ms ease;
}

.preset-btn:hover {
  border-color: var(--line-strong);
  color: var(--ink);
}

.preset-btn.active {
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  border-color: var(--accent);
  color: var(--accent);
}

.experiment-grid {
  display: grid;
  grid-template-columns: .55fr 1.45fr;
  gap: 20px;
}

.control-panel { padding: 8px 24px; }

.control-panel label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.control-panel label:last-child { border-bottom: 0; }

.control-panel output {
  font-family: var(--mono);
  color: var(--accent);
}

.control-panel input {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.experiment-result { padding-bottom: 20px; }

.result-head { align-items: center; }

.result-equation {
  padding: 30px 26px;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1.2fr;
  gap: 14px;
  align-items: end;
  border-bottom: 1px solid var(--line);
}

.result-equation > div:not(.operator) { min-width: 0; }

.result-equation span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  min-height: 32px;
}

.result-equation strong {
  display: block;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: clamp(20px, 2.4vw, 36px);
  font-weight: 500;
  letter-spacing: -.04em;
}

.result-equation .operator {
  color: var(--muted);
  font-family: var(--mono);
  padding-bottom: 7px;
}

.result-equation .total strong { color: var(--accent); }

.diagnostic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

.diagnostic-grid > div {
  padding: 20px 24px;
  border-right: 1px solid var(--line);
}

.diagnostic-grid > div:last-child { border-right: 0; }

.diagnostic-grid span,
.diagnostic-grid small {
  display: block;
  color: var(--muted);
  font-size: 11px;
}

.diagnostic-grid strong {
  display: block;
  margin: 6px 0 3px;
  font-family: var(--mono);
  font-size: 22px;
}

.result-note {
  margin: 18px 24px 0;
  font-weight: 650;
  max-width: 65ch;
  font-size: 15px;
}

.method-note {
  padding: 10px 24px 0;
  margin: 0;
  max-width: 86ch;
}

/* SECTION 05: SYSTEM ARCHITECTURE */
.system-map {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: stretch;
}

.system-node {
  min-height: 180px;
  padding: 24px 20px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.system-node p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.accent-node {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

.accent-node h3 { color: var(--accent); }

.system-arrow {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-family: var(--mono);
}

.system-lower {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 20px;
}

.event-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.event-row {
  min-height: 74px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
}

.event-row:nth-child(odd) { border-right: 1px solid var(--line); }
.event-row:last-child,
.event-row:nth-last-child(2) { border-bottom: 0; }

.event-row code {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 12px;
}

.event-row p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.failure-panel { padding: 24px; }

.failure-panel ul {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.failure-panel li {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.4;
}

.failure-panel li b {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--ink);
}

.failure-panel li span { color: var(--muted); }

/* SECTION 06: WHY EMRE */
.proof-section {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(60px, 8vw, 120px);
}

.experience-note {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
  max-width: 48ch;
}

.experience-note > span {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.experience-note p {
  margin: 8px 0 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.5;
}

.proof-lines {
  border-top: 1px solid var(--line-strong);
  margin-bottom: 32px;
}

.proof-lines div {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.proof-lines span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  font-family: var(--mono);
  letter-spacing: .05em;
  margin-bottom: 4px;
}

.proof-lines strong {
  display: block;
  font-size: 16px;
  font-weight: 650;
  color: var(--ink);
}

.proof-lines small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.contact-card {
  padding: 28px;
}

.contact-header p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.contact-header .location-note {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  margin-top: 4px;
}

.contact-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.contact-actions .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.proof-footnote {
  grid-column: 1 / -1;
  padding: 0;
  margin-top: 24px;
}

/* FOOTER */
footer {
  min-height: 78px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.negative { color: var(--danger) !important; }
.warning { color: var(--warning) !important; }
.positive { color: var(--ok) !important; }

/* RESPONSIVE */
@media (max-width: 1100px) {
  .topbar { grid-template-columns: 1fr auto; }
  .nav { display: none; }
  .hero-grid,
  .section-head,
  .proof-section {
    grid-template-columns: 1fr;
  }
  .job-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .job-card:nth-child(3n) { border-right: 1px solid var(--line); }
  .job-card:nth-child(2n) { border-right: 0; }
  .job-card:nth-child(n+4) { border-bottom: 1px solid var(--line); }
  .job-card:nth-child(n+5) { border-bottom: 0; }

  .decision-shell { grid-template-columns: .55fr 1fr; }
  .decision-path { grid-column: 1 / -1; }

  .result-equation { grid-template-columns: 1fr 1fr; }
  .result-equation .operator { display: none; }

  .system-map { grid-template-columns: 1fr 32px 1fr; }
  .system-map .system-arrow:nth-of-type(4) { display: none; }

  .system-lower { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .topbar {
    min-height: 58px;
    padding: 0 18px;
  }
  .status { font-size: 9px; }
  .hero,
  .section,
  footer {
    width: min(100% - 36px, var(--max));
  }
  .hero { min-height: auto; padding-top: 86px; }
  .hero h1 { font-size: clamp(40px, 12vw, 68px); }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .hero-actions .button { width: 100%; }

  .principle-strip,
  .metrics-row,
  .base-layout,
  .decision-shell,
  .experiment-grid,
  .proof-section,
  .job-grid,
  .timeline-steps,
  .timeline-callout {
    grid-template-columns: 1fr;
  }

  .principle-strip span {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding-left: 0;
  }
  .principle-strip span:last-child { border-bottom: 0; }

  .job-card {
    border-right: 0 !important;
    border-bottom: 1px solid var(--line) !important;
  }
  .job-card:last-child { border-bottom: 0 !important; }

  .timeline-step {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .timeline-step:last-child { border-bottom: 0; }

  .metric {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding-left: 0;
  }
  .metric:last-child { border-bottom: 0; }

  .scenario-rail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--line);
  }
  .scenario-button {
    padding: 12px;
    border-right: 1px solid var(--line);
  }
  .scenario-button:nth-child(even) { border-right: 0; }

  .result-equation,
  .diagnostic-grid,
  .event-list {
    grid-template-columns: 1fr;
  }
  .diagnostic-grid > div,
  .event-row,
  .event-row:nth-child(odd) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .event-row:last-child { border-bottom: 0; }

  .system-map { grid-template-columns: 1fr; }
  .system-arrow {
    height: 28px;
    transform: rotate(90deg);
  }

  .failure-panel li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .operator-rule {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .contact-actions {
    flex-direction: column;
  }
  .contact-actions .button { width: 100%; }

  footer {
    padding: 22px 0;
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}