/* design-systems/atelier-zero/tokens.css
 * Structured token bindings for Atelier Zero.
 * independent studio identity with off-white canvas, sharp black type, and gallery restraint.
 */

:root {
  --bg: #ffffff;
  --surface: #f7f7f7;
  --surface-warm: #eeeeee;
  --fg: #111111;
  --fg-2: #3a3a3a;
  --muted: #707070;
  --meta: #111111;
  --border: #d9d9d9;
  --border-soft: #eeeeee;
  --accent: #111111;
  --accent-on: #ffffff;
  --accent-hover: color-mix(in oklab, var(--accent), black 8%);
  --accent-active: color-mix(in oklab, var(--accent), black 14%);
  --success: #168a46;
  --warn: #b7791f;
  --danger: #c53030;
  --font-display: "Helvetica Neue", Arial, sans-serif;
  --font-body: "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, monospace;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 24px;
  --text-2xl: 36px;
  --text-3xl: 54px;
  --text-4xl: 76px;
  --leading-body: 1.52;
  --leading-tight: 1.06;
  --tracking-display: -0.025em;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --section-y-desktop: 96px;
  --section-y-tablet: 68px;
  --section-y-phone: 48px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;
  --elev-flat: none;
  --elev-ring: 0 0 0 1px var(--border);
  --elev-raised: 0 16px 40px rgba(0, 0, 0, 0.10);
  --focus-ring: 0 0 0 3px rgba(17, 17, 17, 0.18);
  --motion-fast: 150ms;
  --motion-base: 240ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --container-max: 1180px;
  --container-gutter-desktop: 36px;
  --container-gutter-tablet: 24px;
  --container-gutter-phone: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-gutter: stable; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--font-body); font-size: var(--text-base); line-height: var(--leading-body); }
body.concierge-open { overflow: hidden; }
body::before { content: ""; position: fixed; inset: 0; z-index: 20; opacity: .055; pointer-events: none; background-image: radial-gradient(circle at 12% 20%, color-mix(in oklab, var(--warn), transparent 90%), transparent 32%), radial-gradient(circle at 88% 72%, color-mix(in oklab, var(--warn), transparent 92%), transparent 34%), url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.88' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.42'/%3E%3C/svg%3E"); mix-blend-mode: multiply; }
a { color: inherit; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 14px; background: var(--accent); color: var(--accent-on); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.meta-strip { position: absolute; z-index: 12; top: 0; left: 0; right: 0; height: 28px; display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; padding: 0 clamp(var(--container-gutter-phone), 3vw, var(--container-gutter-desktop)); border-bottom: 1px solid color-mix(in oklab, var(--fg), transparent 78%); font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .06em; text-transform: uppercase; }
.meta-strip span:nth-child(2) { text-align: center; }
.meta-strip span:last-child { display: flex; justify-content: flex-end; align-items: center; gap: 8px; }
.meta-strip i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.side-rail { position: fixed; z-index: 8; top: 50%; width: 36px; font-size: 10px; font-weight: 600; letter-spacing: .42em; text-transform: uppercase; white-space: nowrap; pointer-events: none; }
.side-rail-left { left: 0; transform: translate(-47%, -50%) rotate(-90deg); }
.side-rail-right { right: 0; transform: translate(47%, -50%) rotate(90deg); }

.site-header { position: absolute; z-index: 10; top: 28px; left: 0; right: 0; height: 80px; display: grid; grid-template-columns: 1fr auto; align-items: center; padding: 0 clamp(var(--container-gutter-phone), 3vw, var(--container-gutter-desktop)); border-bottom: 1px solid color-mix(in oklab, var(--fg), transparent 83%); }
.wordmark { font-family: var(--font-display); font-size: 23px; font-weight: 600; letter-spacing: var(--tracking-display); text-decoration: none; }
.wordmark span { font-family: Georgia, serif; font-style: italic; }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 2.4vw, 40px); font-size: var(--text-sm); }
.site-nav a { text-decoration: none; }
.site-nav a:not(.nav-action) { border-bottom: 1px solid transparent; }
.site-nav a:not(.nav-action):hover { border-color: currentColor; }
.nav-action { min-height: 44px; display: inline-flex; align-items: center; gap: 16px; padding: 0 18px; border: 1px solid color-mix(in oklab, var(--fg), transparent 55%); border-radius: var(--radius-pill); transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard); }
.nav-action:hover { background: var(--accent); color: var(--accent-on); }
.menu-toggle { display: none; background: none; border: 0; color: var(--fg); min-height: 44px; }

.hero { min-height: 100svh; position: relative; overflow: hidden; background: var(--surface-warm); }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 54%, color-mix(in oklab, var(--bg), transparent 86%) 75%, color-mix(in oklab, var(--bg), transparent 58%) 100%); pointer-events: none; }
.hero-media, .hero-media video { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-media video { object-fit: cover; object-position: center; }
.hero-copy { position: absolute; z-index: 2; isolation: isolate; top: clamp(138px, 17vh, 170px); right: clamp(var(--container-gutter-phone), 6vw, 108px); width: min(37vw, 540px); }
.hero-copy::before { content: ""; position: absolute; z-index: -1; inset: -26px -24px -28px -28px; border-top: 1px solid color-mix(in oklab, var(--fg), transparent 80%); border-bottom: 1px solid color-mix(in oklab, var(--fg), transparent 80%); background: color-mix(in oklab, var(--bg), transparent 6%); pointer-events: none; }
.folio, .kicker { margin: 0 0 var(--space-5); font-family: var(--font-mono); font-size: 11px; line-height: 1.5; letter-spacing: .08em; text-transform: uppercase; }
.hero h1 { max-width: 9ch; margin: 0; font-family: var(--font-display); font-size: clamp(42px, 5.6vw, 86px); font-weight: 500; line-height: .96; letter-spacing: -.04em; text-wrap: balance; }
.hero-copy > p:not(.folio) { max-width: 45ch; margin: var(--space-6) 0 var(--space-8); color: var(--fg); }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 28px; padding: 12px 22px; border: 1px solid var(--accent); border-radius: var(--radius-md); font-size: var(--text-sm); letter-spacing: .02em; text-decoration: none; cursor: pointer; transition: transform var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard); }
.button-primary { background: var(--accent); color: var(--accent-on); }
.button-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.button-primary:active { background: var(--accent-active); transform: translateY(0); }
.hero-caption { position: absolute; z-index: 2; left: clamp(var(--container-gutter-phone), 3vw, var(--container-gutter-desktop)); bottom: 28px; margin: 0; font-family: var(--font-mono); font-size: 10px; letter-spacing: .06em; text-transform: uppercase; }
.motion-toggle { position: absolute; z-index: 3; right: calc(clamp(var(--container-gutter-phone), 3vw, var(--container-gutter-desktop)) + 212px); bottom: 18px; min-height: 44px; display: inline-flex; align-items: center; gap: 10px; padding: 0 14px; border: 1px solid color-mix(in oklab, var(--fg), transparent 54%); border-radius: var(--radius-pill); background: color-mix(in oklab, var(--bg), transparent 12%); color: var(--fg); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; cursor: pointer; transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard); }
.motion-toggle:hover { background: var(--accent); color: var(--accent-on); }
.media-brackets { position: absolute; z-index: 2; inset: 120px 20px 20px; pointer-events: none; }
.media-brackets i { position: absolute; width: 22px; height: 22px; border-color: color-mix(in oklab, var(--fg), transparent 32%); }
.media-brackets i:nth-child(1) { left: 0; top: 0; border-left: 1px solid; border-top: 1px solid; }
.media-brackets i:nth-child(2) { right: 0; top: 0; border-right: 1px solid; border-top: 1px solid; }
.media-brackets i:nth-child(3) { right: 0; bottom: 0; border-right: 1px solid; border-bottom: 1px solid; }
.media-brackets i:nth-child(4) { left: 0; bottom: 0; border-left: 1px solid; border-bottom: 1px solid; }
.plate { position: absolute; z-index: 3; margin: 0; font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .06em; text-transform: uppercase; }
.plate-hero { left: 22px; top: 126px; }

.editorial-section, .walkthrough { padding: var(--section-y-desktop) max(var(--container-gutter-desktop), calc((100vw - var(--container-max)) / 2)); }
.section-index { display: grid; grid-template-columns: 1fr 2fr auto; align-items: center; gap: var(--space-5); padding-top: 12px; border-top: 1px solid var(--border); font-family: var(--font-mono); font-size: 10px; letter-spacing: .06em; text-transform: uppercase; }
.section-index span:nth-child(2) { text-align: center; color: var(--muted); }
.opening-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-6); margin: 112px 0 132px; }
.opening-grid .kicker { grid-column: 1 / 4; padding-top: 11px; }
.opening-grid h2 { grid-column: 4 / 11; margin: 0; font-family: var(--font-display); font-weight: 500; font-size: clamp(40px, 5vw, var(--text-4xl)); line-height: 1.02; letter-spacing: -.035em; }
.opening-grid .lead-copy { grid-column: 8 / 12; margin: 44px 0 0; font-size: var(--text-lg); color: var(--fg-2); max-width: 41ch; }
.river-sequence { display: grid; grid-template-columns: repeat(4, 1fr); position: relative; }
.river-sequence::before { content: ""; position: absolute; left: 0; right: 0; top: 16px; border-top: 1px solid var(--fg); }
.river-sequence article { position: relative; padding: 58px 28px 0 0; }
.river-sequence article::before { content: ""; position: absolute; top: 12px; left: 0; width: 9px; height: 9px; border: 1px solid var(--fg); border-radius: 50%; background: var(--bg); }
.river-sequence article:not(:last-child)::after { content: "→"; position: absolute; right: 24px; top: 3px; font-size: 18px; }
.stage-number { font-family: var(--font-mono); font-size: 10px; }
.river-sequence h3 { margin: 10px 0 14px; font-size: var(--text-xl); font-weight: 500; letter-spacing: -.02em; }
.river-sequence p { margin: 0; color: var(--fg-2); max-width: 27ch; }

.atlas { min-height: min(1000px, 92svh); position: relative; overflow: hidden; background: var(--fg); color: var(--accent-on); }
.atlas-image { position: absolute; inset: 0; background: linear-gradient(90deg, color-mix(in oklab, var(--fg), transparent 8%) 0%, transparent 48%, color-mix(in oklab, var(--fg), transparent 76%) 100%), url("assets/media/archive-constellation.png") center / cover no-repeat; transform: scale(1.01); }
.atlas-overlay { position: relative; z-index: 1; min-height: inherit; display: flex; flex-direction: column; padding: 52px max(var(--container-gutter-desktop), calc((100vw - var(--container-max)) / 2)) 64px; }
.section-index-inverse { border-color: color-mix(in oklab, var(--accent-on), transparent 66%); }
.section-index-inverse span:nth-child(2) { color: color-mix(in oklab, var(--accent-on), transparent 32%); }
.atlas-copy { width: min(520px, 44vw); margin-top: auto; padding: 34px; background: color-mix(in oklab, var(--fg), transparent 12%); }
.atlas-copy h2 { margin: 0; font-size: clamp(40px, 5.2vw, 74px); line-height: 1.01; font-weight: 500; letter-spacing: -.04em; }
.atlas-copy p:last-child { max-width: 44ch; margin: var(--space-6) 0 0; color: color-mix(in oklab, var(--accent-on), transparent 18%); }
.media-brackets-inverse { inset: 22px; }
.media-brackets-inverse i { border-color: color-mix(in oklab, var(--accent-on), transparent 32%); }
.plate-atlas { right: 30px; bottom: 28px; }
.atlas a:focus-visible, .site-footer a:focus-visible { outline-color: var(--accent-on); }

.principle { padding-top: 120px; padding-bottom: 140px; }
.principle-grid { display: grid; grid-template-columns: 1.55fr .75fr; gap: 11vw; margin-top: 120px; align-items: end; }
.principle blockquote { margin: 0; font-size: clamp(42px, 6.2vw, 92px); font-weight: 500; line-height: .98; letter-spacing: -.04em; }
.principle-notes { border-left: 1px solid var(--border); padding-left: 28px; color: var(--fg-2); }
.principle-notes p { max-width: 35ch; }
.principle-notes p + p { margin-top: 32px; }
.thread-diagram { display: grid; grid-template-columns: 10px 1fr 10px 1fr 10px 1fr 10px; align-items: center; margin-top: 100px; }
.thread-diagram span { width: 10px; height: 10px; border: 1px solid var(--fg); border-radius: 50%; }
.thread-diagram i { display: block; border-top: 1px solid var(--fg); }

.walkthrough { background: var(--surface); }
.walkthrough-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10vw; margin-top: 96px; }
.walkthrough h2 { max-width: 8ch; margin: 0; font-size: clamp(50px, 6vw, 86px); line-height: .97; font-weight: 500; letter-spacing: -.04em; }
.walkthrough-copy > p { max-width: 42ch; margin: 0 0 36px; font-size: var(--text-lg); }
form { display: grid; gap: 20px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; column-gap: 18px; }
label { display: grid; gap: 8px; font-size: var(--text-sm); }
.field { display: grid; gap: 8px; }
input, textarea { width: 100%; border: 0; border-bottom: 1px solid var(--fg); border-radius: 0; padding: 12px 0; background: transparent; color: var(--fg); resize: vertical; }
input:focus, textarea:focus { outline: 0; border-bottom-width: 2px; }
input:focus-visible, textarea:focus-visible { box-shadow: 0 3px 0 color-mix(in oklab, var(--accent), transparent 74%); }
form .button { justify-self: start; margin-top: 8px; }
.form-note { margin: -8px 0 0; font-size: var(--text-xs); color: var(--muted); }

.site-footer { position: relative; min-height: 390px; padding: 64px max(var(--container-gutter-desktop), calc((100vw - var(--container-max)) / 2)); display: flex; justify-content: space-between; align-items: flex-start; overflow: hidden; background: var(--fg); color: var(--accent-on); }
.site-footer p { max-width: 34ch; color: color-mix(in oklab, var(--accent-on), transparent 34%); }
.back-top { font-size: var(--text-sm); text-underline-offset: 4px; }
.footer-mark { position: absolute; left: -1vw; bottom: -8vw; margin: 0; font-family: var(--font-display); font-weight: 600; font-size: clamp(110px, 15vw, 240px); line-height: 1; letter-spacing: -.06em; color: color-mix(in oklab, var(--accent-on), transparent 88%) !important; white-space: nowrap; user-select: none; }

.concierge-trigger { position: fixed; z-index: 30; right: 24px; bottom: 22px; min-height: 48px; display: inline-flex; align-items: center; gap: 32px; padding: 0 20px; border: 1px solid var(--accent); border-radius: var(--radius-pill); background: var(--accent); color: var(--accent-on); font-size: var(--text-sm); letter-spacing: .02em; cursor: pointer; box-shadow: var(--elev-raised); transition: transform var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard); }
.concierge-trigger:hover { background: var(--accent-hover); transform: translateY(-1px); }
.concierge-trigger[aria-expanded="true"] { visibility: hidden; }
.concierge[hidden] { display: none; }
.concierge { position: fixed; z-index: 31; right: 24px; bottom: 22px; width: min(440px, calc(100vw - 48px)); height: min(680px, calc(100svh - 44px)); display: grid; grid-template-rows: auto auto auto minmax(120px, 1fr) auto; gap: 18px; padding: 24px; overflow: hidden; border: 1px solid var(--fg); border-radius: var(--radius-lg); background: var(--surface); color: var(--fg); box-shadow: var(--elev-raised); }
.concierge::before { content: ""; position: absolute; inset: 8px; border: 1px solid var(--border); border-radius: var(--radius-md); pointer-events: none; }
.concierge-header, .concierge-intro, .concierge-starters, .concierge-log, .concierge-form { position: relative; z-index: 1; }
.concierge-header { display: grid; grid-template-columns: 1fr auto; gap: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.concierge-folio { margin: 0 0 5px; font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.concierge h2 { max-width: 11ch; margin: 0; font-family: var(--font-display); font-size: 30px; font-weight: 500; line-height: 1.04; letter-spacing: -.025em; }
.concierge-close { align-self: start; min-height: 44px; padding: 0; border: 0; background: transparent; color: var(--fg); font-size: var(--text-xs); letter-spacing: .06em; text-transform: uppercase; cursor: pointer; }
.concierge-close span { margin-left: 6px; font-size: 20px; vertical-align: -1px; }
.concierge-close:hover { text-decoration: underline; text-underline-offset: 4px; }
.concierge-intro { max-width: 48ch; margin: 0; color: var(--fg-2); font-size: 13px; }
.concierge-starters { display: flex; flex-wrap: wrap; gap: 8px; }
.concierge-starters button { min-height: 44px; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius-pill); background: transparent; color: var(--fg); font-size: 11px; cursor: pointer; transition: background var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard); }
.concierge-starters button:hover { border-color: var(--fg); background: var(--bg); }
.concierge-starters button:disabled { cursor: wait; opacity: .6; }
.concierge-log { min-height: 0; overflow-y: auto; padding: 4px 4px 4px 0; scrollbar-color: var(--muted) transparent; }
.concierge-message { max-width: 88%; margin: 0 0 14px; padding-top: 10px; border-top: 1px solid var(--border); }
.concierge-message-user { margin-left: auto; }
.concierge-message-role { display: block; margin-bottom: 5px; font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.concierge-message p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; font-size: var(--text-sm); }
.concierge-message-user p { font-weight: 500; }
.concierge-form { gap: 8px; padding-top: 14px; border-top: 1px solid var(--fg); }
.concierge-form label { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .08em; text-transform: uppercase; }
.concierge-compose { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 12px; }
.concierge-compose textarea { min-height: 52px; max-height: 120px; padding: 8px 0; }
.concierge-send { min-width: 72px; min-height: 44px; padding: 0 12px; border: 1px solid var(--accent); border-radius: var(--radius-md); background: var(--accent); color: var(--accent-on); cursor: pointer; }
.concierge-send:hover { background: var(--accent-hover); }
.concierge-send:disabled { cursor: wait; opacity: .55; }
.concierge-feedback { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 12px; min-height: 44px; }
.concierge-status { min-height: 18px; margin: 0; color: var(--muted); font-size: 11px; }
.concierge-status.is-error { color: var(--danger); }
.concierge-retry { min-height: 44px; padding: 0 12px; border: 1px solid var(--fg); border-radius: var(--radius-md); background: transparent; color: var(--fg); font-size: var(--text-xs); letter-spacing: .02em; cursor: pointer; }
.concierge-retry:hover { background: var(--fg); color: var(--accent-on); }
.concierge-retry[hidden] { display: none; }
.concierge[aria-busy="true"] .concierge-log::after { content: "Consulting the archive…"; display: block; margin-top: 8px; font-family: var(--font-mono); font-size: 10px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }

@media (max-width: 960px) {
  .side-rail { display: none; }
  .meta-strip { grid-template-columns: 1fr 1fr; }
  .meta-strip span:nth-child(2) { display: none; }
  .site-header { height: 72px; }
  .menu-toggle { display: flex; align-items: center; gap: 10px; cursor: pointer; }
  .menu-mark, .menu-mark::before { display: block; width: 20px; height: 1px; background: currentColor; transition: transform var(--motion-fast) var(--ease-standard); }
  .menu-mark { position: relative; }
  .menu-mark::before { content: ""; position: absolute; top: 6px; }
  .menu-toggle[aria-expanded="true"] .menu-mark { transform: rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-mark::before { top: 0; transform: rotate(90deg); }
  .site-nav { display: none; position: absolute; top: 72px; left: 0; right: 0; padding: 24px; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; align-items: stretch; }
  .site-nav.is-open { display: flex; }
  .site-nav a { min-height: 44px; display: flex; align-items: center; }
  .nav-action { justify-content: space-between; }
  .hero-copy { top: 132px; right: 24px; width: min(46vw, 420px); }
  .hero h1 { font-size: clamp(40px, 6.6vw, 64px); }
  .opening-grid { margin: 84px 0 100px; }
  .opening-grid .kicker { grid-column: 1 / 4; }
  .opening-grid h2 { grid-column: 4 / 13; }
  .opening-grid .lead-copy { grid-column: 6 / 13; }
  .river-sequence { grid-template-columns: 1fr 1fr; gap: 48px 28px; }
  .river-sequence::before, .river-sequence article::before, .river-sequence article::after { display: none; }
  .river-sequence article { padding: 0; }
  .atlas-copy { width: min(620px, 72vw); }
  .principle-grid { grid-template-columns: 1fr; gap: 64px; }
  .principle-notes { max-width: 550px; margin-left: auto; }
}

@media (max-width: 680px) {
  .meta-strip { font-size: 8px; letter-spacing: .04em; }
  .meta-strip span { white-space: nowrap; }
  .site-header { position: absolute; }
  .hero { min-height: 860px; display: flex; flex-direction: column; }
  .hero::after { background: linear-gradient(180deg, color-mix(in oklab, var(--bg), transparent 10%) 0, color-mix(in oklab, var(--bg), transparent 34%) 41%, transparent 64%); }
  .hero-media { top: 0; bottom: auto; height: 100%; }
  .hero-media video { object-position: 39% center; }
  .hero-copy { top: 148px; left: var(--container-gutter-phone); right: var(--container-gutter-phone); width: auto; }
  .hero h1 { max-width: 10ch; font-size: clamp(44px, 13vw, 62px); line-height: .98; }
  .hero-copy > p:not(.folio) { max-width: 35ch; margin: 18px 0 24px; }
  .hero-caption { bottom: 18px; }
  .motion-toggle { right: var(--container-gutter-phone); bottom: max(90px, calc(950px - 100svh)); }
  .hero-caption { max-width: 16ch; bottom: 16px; }
  .media-brackets { inset: 112px 10px 10px; }
  .plate-hero { top: 116px; left: 14px; }
  .editorial-section, .walkthrough { padding: var(--section-y-phone) var(--container-gutter-phone); }
  .section-index { grid-template-columns: auto 1fr auto; gap: 12px; }
  .section-index span:nth-child(2) { text-align: left; padding-left: 10px; }
  .opening-grid { display: block; margin: 72px 0 90px; }
  .opening-grid h2 { margin-top: 32px; font-size: clamp(38px, 11vw, 54px); }
  .opening-grid .lead-copy { margin-top: 36px; }
  .river-sequence { grid-template-columns: 1fr; gap: 56px; }
  .river-sequence article { padding-top: 16px; border-top: 1px solid var(--border); }
  .atlas { min-height: 820px; }
  .atlas-image { background-image: linear-gradient(180deg, color-mix(in oklab, var(--fg), transparent 86%) 30%, color-mix(in oklab, var(--fg), transparent 5%) 78%), url("assets/media/archive-constellation.png"); background-position: center top; background-size: auto 72%, cover; background-repeat: no-repeat; }
  .atlas-overlay { padding: 32px var(--container-gutter-phone) 48px; }
  .atlas-copy { width: 100%; padding: 26px 0 0; background: transparent; }
  .atlas-copy h2 { font-size: clamp(42px, 12vw, 60px); }
  .principle { padding-top: 72px; padding-bottom: 88px; }
  .principle-grid { margin-top: 76px; gap: 52px; }
  .principle blockquote { font-size: clamp(40px, 11vw, 58px); }
  .principle-notes { margin-left: 0; }
  .thread-diagram { margin-top: 70px; grid-template-columns: 8px 1fr 8px 1fr 8px 1fr 8px; }
  .thread-diagram span { width: 8px; height: 8px; }
  .walkthrough-grid { grid-template-columns: 1fr; gap: 64px; margin-top: 72px; }
  .walkthrough h2 { max-width: 9ch; font-size: clamp(44px, 13vw, 62px); }
  .field-row { grid-template-columns: 1fr; gap: 20px; }
  form .button { width: 100%; }
  .site-footer { min-height: 340px; padding: 48px var(--container-gutter-phone); flex-direction: column; justify-content: flex-start; gap: 32px; }
  .footer-mark { bottom: -2vw; font-size: 24vw; }
  .concierge-trigger { right: var(--container-gutter-phone); bottom: max(14px, env(safe-area-inset-bottom)); }
  .concierge { inset: max(8px, env(safe-area-inset-top)) 8px max(8px, env(safe-area-inset-bottom)); width: auto; height: auto; padding: 20px 18px 18px; gap: 14px; border-radius: var(--radius-md); }
  .concierge h2 { font-size: 28px; }
  .concierge-intro { font-size: 12px; }
  .concierge-starters { display: grid; grid-template-columns: 1fr 1fr; overflow: visible; }
  .concierge-starters button { width: 100%; min-height: 44px; }
  .concierge-starters button:last-child { grid-column: 1 / -1; }
  .concierge-message { max-width: 94%; }
}

@media (min-width: 681px) and (max-width: 960px) and (max-height: 640px) {
  .page-hero { min-height: calc(100svh - 108px); grid-template-columns: .9fr 1.1fr; }
  .page-hero-copy { min-height: 0; padding: 42px 28px 34px; }
  .page-hero h1 { font-size: clamp(36px, 5.1vw, 46px); line-height: .96; }
  .page-hero-copy > p:not(.folio) { margin-top: 16px; font-size: 13px; line-height: 1.42; }
  .page-hero-actions { margin-top: 20px; }
  .page-hero-media { min-height: 0; }
  .motion-toggle { left: 24px; right: auto; bottom: 62px; }
  .concierge-trigger { min-width: 84px; justify-content: center; gap: 14px; padding: 0 16px; }
  .concierge-trigger span:first-child { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
  .concierge-trigger::before { content: "Ask"; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .hero-media video { display: none; }
  .hero-media { background: url("assets/media/hero-manuscript-river.png") center / cover no-repeat; }
  .motion-toggle { display: none; }
}

/* Multi-page editorial system */
.site-header, .meta-strip { position: fixed; background: color-mix(in oklab, var(--bg), transparent 3%); backdrop-filter: blur(10px); }
.site-header { top: 28px; }
.site-nav a[aria-current="page"] { border-bottom-color: currentColor; font-weight: 600; }
.page-shell { padding-top: 108px; }
.page-hero { min-height: min(760px, calc(100svh - 108px)); display: grid; grid-template-columns: minmax(0, .86fr) minmax(420px, 1.14fr); border-bottom: 1px solid var(--border); background: var(--surface-warm); }
.page-hero-copy { z-index: 2; display: flex; flex-direction: column; justify-content: center; padding: clamp(52px, 7vw, 104px) clamp(28px, 5vw, 80px); background: var(--bg); }
.page-hero h1 { max-width: 10ch; margin: 0; font-size: clamp(52px, 6vw, 88px); font-weight: 500; line-height: .96; letter-spacing: -.04em; text-wrap: balance; }
.page-hero-copy > p:not(.folio) { max-width: 48ch; margin: 28px 0 0; color: var(--fg-2); font-size: var(--text-lg); }
.page-hero-actions { display: flex; flex-wrap: wrap; gap: 12px 22px; align-items: center; margin-top: 32px; }
.text-link { min-height: 44px; display: inline-flex; align-items: center; gap: 12px; text-underline-offset: 5px; }
.page-hero-media { position: relative; min-height: 560px; overflow: hidden; background: var(--fg); }
.page-hero-media img { width: 100%; height: 100%; object-fit: cover; }
.page-hero-media .media-brackets { inset: 18px; }
.page-hero-media .plate { left: 26px; top: 26px; padding: 6px 8px; background: color-mix(in oklab, var(--bg), transparent 6%); }
.page-hero-media.archive img { object-position: center; }
.page-hero-media.river img { object-position: 42% center; }
.editorial-section h2 { margin: 0; font-size: clamp(38px, 4.8vw, 70px); font-weight: 500; line-height: 1; letter-spacing: -.035em; }
.section-lead { display: grid; grid-template-columns: minmax(0, .78fr) minmax(300px, 1.22fr); gap: 8vw; margin: 84px 0 76px; align-items: start; }
.section-lead p { max-width: 50ch; margin: 10px 0 0; color: var(--fg-2); font-size: var(--text-lg); }
.rule-list { border-top: 1px solid var(--fg); }
.rule-row { display: grid; grid-template-columns: 72px minmax(180px, .62fr) minmax(280px, 1.38fr); gap: 28px; padding: 28px 0; border-bottom: 1px solid var(--border); }
.rule-row > span:first-child { font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; }
.rule-row h3 { margin: 0; font-size: clamp(21px, 2.2vw, 30px); font-weight: 500; letter-spacing: -.025em; }
.rule-row p { max-width: 64ch; margin: 0; color: var(--fg-2); }
.status { display: inline-flex; width: fit-content; margin-top: 12px; padding: 5px 8px; border: 1px solid var(--fg); font-family: var(--font-mono); font-size: 10px; letter-spacing: .06em; text-transform: uppercase; }
.pair-list { border-top: 1px solid var(--fg); }
.pair-row { display: grid; grid-template-columns: minmax(180px, .72fr) 32px minmax(260px, 1.28fr); gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--border); align-items: baseline; }
.pair-row strong { font-size: clamp(21px, 2.4vw, 32px); font-weight: 500; letter-spacing: -.025em; }
.pair-row span { font-family: var(--font-mono); font-size: 12px; }
.pair-row p { margin: 0; color: var(--fg-2); }
.editorial-note { margin: 84px 0 0 auto; max-width: 720px; padding: 30px 0 0 32px; border-top: 1px solid var(--fg); border-left: 1px solid var(--fg); }
.editorial-note h3 { margin: 0 0 14px; font-size: var(--text-2xl); font-weight: 500; letter-spacing: -.025em; }
.editorial-note p { margin: 0; color: var(--fg-2); }
.onward { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: end; padding: 72px max(var(--container-gutter-desktop), calc((100vw - var(--container-max)) / 2)); border-top: 1px solid var(--fg); background: var(--surface); }
.onward p { max-width: 52ch; margin: 12px 0 0; color: var(--fg-2); }
.onward h2 { max-width: 12ch; margin: 0; font-size: clamp(36px, 4.8vw, 68px); font-weight: 500; line-height: 1; letter-spacing: -.035em; }
.audience-index { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--fg); }
.audience-index article { min-width: 0; padding: 28px 24px 32px 0; border-bottom: 1px solid var(--border); }
.audience-index article + article { padding-left: 24px; border-left: 1px solid var(--border); }
.audience-index h3 { margin: 18px 0 12px; font-size: var(--text-xl); font-weight: 500; }
.audience-index p { margin: 0; color: var(--fg-2); }
.agenda { counter-reset: agenda; border-top: 1px solid var(--fg); }
.agenda article { counter-increment: agenda; display: grid; grid-template-columns: 64px minmax(200px, .7fr) minmax(280px, 1.3fr); gap: 28px; padding: 26px 0; border-bottom: 1px solid var(--border); }
.agenda article::before { content: counter(agenda, decimal-leading-zero); font-family: var(--font-mono); font-size: 11px; }
.agenda h3, .agenda p { margin: 0; }
.agenda h3 { font-size: var(--text-xl); font-weight: 500; }
.agenda p { color: var(--fg-2); }
.source-note { margin-top: 32px; color: var(--muted); font-size: var(--text-xs); }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px 28px; }
.footer-links a { min-height: 44px; display: inline-flex; align-items: center; }
.site-footer { min-height: 330px; display: grid; grid-template-columns: 1fr auto; gap: 48px; }
.site-footer .footer-mark { grid-column: 1 / -1; }

@media (max-width: 960px) {
  .page-hero { grid-template-columns: 1fr; }
  .page-hero-copy { min-height: 520px; padding-top: 84px; }
  .page-hero-media { min-height: 540px; }
  .section-lead { grid-template-columns: 1fr; gap: 32px; }
  .rule-row, .agenda article { grid-template-columns: 48px minmax(180px, .7fr) minmax(240px, 1.3fr); gap: 20px; }
  .audience-index { grid-template-columns: 1fr 1fr; }
  .audience-index article:nth-child(3) { border-left: 0; }
  .site-nav a[aria-current="page"] { border-bottom: 0; text-decoration: underline; text-underline-offset: 5px; }
}

@media (max-width: 680px) {
  .page-shell { padding-top: 100px; }
  .page-hero-copy { min-height: 520px; padding: 68px var(--container-gutter-phone) 72px; }
  .page-hero h1 { font-size: clamp(44px, 13vw, 62px); }
  .page-hero-copy > p:not(.folio) { font-size: var(--text-base); }
  .page-hero-actions .text-link { display: none; }
  .page-hero-media { min-height: 460px; }
  .page-hero-media.archive img { object-position: 48% center; }
  .page-hero-media.river img { object-position: 37% center; }
  .page-hero-media .plate { top: 128px; left: 16px; }
  .section-lead { margin: 62px 0 54px; }
  .rule-row, .agenda article { grid-template-columns: 38px 1fr; gap: 12px 16px; }
  .rule-row p, .rule-row .status, .agenda p { grid-column: 2; }
  .pair-row { grid-template-columns: 1fr; gap: 8px; }
  .pair-row span { transform: rotate(90deg); transform-origin: left center; }
  .editorial-note { margin-top: 60px; padding-left: 20px; }
  .audience-index { grid-template-columns: 1fr; }
  .audience-index article, .audience-index article + article { padding: 24px 0; border-left: 0; }
  .onward { grid-template-columns: 1fr; padding: 56px var(--container-gutter-phone) 96px; }
  .onward .button { width: 100%; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-links { display: grid; gap: 0; }
}

@media (min-width: 681px) and (max-width: 960px) and (max-height: 640px) {
  .page-hero { min-height: calc(100svh - 108px); grid-template-columns: .9fr 1.1fr; }
  .page-hero-copy { min-height: 0; padding: 38px 28px 32px; }
  .page-hero h1 { font-size: clamp(34px, 4.7vw, 42px); line-height: .96; }
  .page-hero-copy > p:not(.folio) { margin-top: 14px; font-size: 12px; line-height: 1.4; }
  .page-hero-actions { margin-top: 16px; }
  .page-hero-actions .text-link { display: none; }
  .page-hero-media { min-height: 0; }
}