/* xout - paper, ink, and one crimson X. Editorial print world, terminal heart. */

:root {
  color-scheme: light;
  --paper: #f7f1e7;
  --paper-deep: #efe6d6;
  --ink: #29251f;
  --muted: #665f55;
  --line: #d5c9b7;
  --line-soft: #e4dac9;
  --panel: #fffaf2;
  --accent: #9f2f25;
  --survivor: #205f52;
  --term-bg: #16140f;
  --term-panel: #201d17;
  --term-line: #37332b;
  --term-ink: #f4efe4;
  --term-muted: #a8a193;
  --term-accent: #e4374f;
  --shadow-ink: rgba(41, 37, 31, .16);
  --max: 72rem;
  --serif: "Iowan Old Style", "Palatino Nova", Palatino, Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html:lang(ko) { word-break: keep-all; }
body {
  margin: 0;
  background:
    radial-gradient(120rem 60rem at 85% -10%, var(--paper-deep), transparent 60%),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  caret-color: var(--accent);
}
::selection { background: var(--accent); color: var(--panel); }
html { scrollbar-color: var(--line) var(--paper); }

a { color: var(--ink); text-decoration-thickness: .09em; text-underline-offset: .22em; transition: text-decoration-thickness .15s ease-out, color .15s ease-out; }
a:hover { text-decoration-thickness: .18em; color: var(--accent); }
a:focus-visible { outline: 3px solid var(--survivor); outline-offset: 3px; border-radius: .1rem; }
summary:focus-visible { outline: 3px solid var(--survivor); outline-offset: 3px; border-radius: .1rem; }
.skip-link { position: absolute; left: 1rem; top: -5rem; padding: .7rem 1rem; background: var(--ink); color: var(--paper); z-index: 9; }
.skip-link:focus { top: 1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* ---------- header ---------- */
.site-header, main, .site-footer { width: min(var(--max), calc(100% - 2.5rem)); margin-inline: auto; }
.site-header {
  position: sticky; top: 0; z-index: 5;
  min-height: 4.25rem;
  display: flex; align-items: center; gap: 1.25rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px);
  width: 100%; padding-inline: max(1.25rem, calc((100% - var(--max)) / 2));
}
.wordmark { min-height: 44px; display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); font-family: var(--serif); font-size: 1.4rem; font-weight: 700; letter-spacing: -.02em; text-decoration: none; }
.wordmark:hover { color: var(--ink); }
.wordmark img { width: 32px; height: 32px; border-radius: .45rem; }
.primary-navigation { display: flex; flex-wrap: wrap; gap: .1rem; margin-left: auto; font-size: .94rem; }
.primary-navigation a, .language a, .site-footer a { min-height: 44px; display: inline-flex; align-items: center; padding: .5rem .7rem; text-decoration: none; }
.primary-navigation a:hover { text-decoration: underline; text-decoration-thickness: .14em; text-underline-offset: .25em; }
.header-links { display: flex; align-items: center; gap: .2rem; }
.icon-link { min-height: 44px; min-width: 44px; display: inline-flex; align-items: center; justify-content: center; padding: .5rem .55rem; color: var(--ink); border-radius: .35rem; }
.icon-link:hover { color: var(--accent); }
.icon { flex: none; }
.button .icon { margin-right: .55rem; }
.button .icon-wordmark { margin-right: 0; }
.language { display: flex; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); }
.language a { color: var(--muted); border-radius: 999px; font-size: .88rem; }
.language a[aria-current="page"], .language a.current { background: var(--ink); color: var(--paper); }

/* ---------- sections ---------- */
section { padding: clamp(5rem, 10vh, 7.5rem) 0; border-bottom: 1px solid var(--line-soft); }
h1, h2, h3 { font-family: var(--serif); line-height: 1.06; letter-spacing: -.025em; font-weight: 700; text-wrap: balance; }
h1 { max-width: 15ch; margin: 0; font-size: clamp(2.9rem, 6.4vw, 5.6rem); }
h2 { margin: 0 0 1.1rem; max-width: 22ch; font-size: clamp(2rem, 4.2vw, 3.4rem); }
h3 { margin: 0 0 .55rem; font-size: 1.12rem; letter-spacing: 0; }
p { max-width: 65ch; }
.section-intro { margin: 0 0 2.25rem; color: var(--muted); font-size: 1.14rem; }

/* ---------- hero ---------- */
.hero { min-height: 40rem; display: grid; align-content: center; position: relative; }
.hero-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(24rem, 1.1fr); align-items: center; gap: clamp(2rem, 5vw, 4.5rem); }
.hero-story { min-width: 0; }
.hero-motion { margin: 0; }
.hero-motion video, .hero-motion img { width: 100%; height: auto; display: block; border: 1px solid var(--term-line); border-radius: .7rem; box-shadow: 0 1.4rem 2.6rem -1rem var(--shadow-ink); }
.hero-motion figcaption { margin-top: .7rem; font-size: .92rem; color: var(--muted); }
.mechanism-story { max-width: 46rem; margin: 1.5rem 0 2rem; }
.hero-body { margin: 1.6rem 0 .6rem; font-size: 1.22rem; color: var(--muted); }
.proof-line { margin: 0; font-weight: 700; }
.first-screen-notice { margin: .9rem 0 0; color: var(--muted); font-weight: 600; font-size: .98rem; }
.hero-command { margin: 1.25rem 0 0; }
.hero-command code { display: block; max-width: 100%; padding: .7rem .9rem; overflow-x: auto; background: var(--term-bg); color: var(--term-ink); border: 1px solid var(--term-line); border-radius: .45rem; font: .95rem/1.5 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.trust-strip { display: flex; flex-wrap: wrap; gap: .5rem; margin: 3rem 0 0; padding: 0; list-style: none; }
.trust-strip li { padding: .32rem .75rem; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); color: var(--muted); font-size: .82rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.demo-disclosure { margin-top: 1.5rem; }
.demo-disclosure summary { width: fit-content; min-height: 44px; display: flex; align-items: center; gap: .4rem; color: var(--ink); cursor: pointer; font-weight: 700; text-decoration: underline; text-decoration-thickness: .09em; text-underline-offset: .22em; }
.demo-disclosure summary:hover { color: var(--accent); }
.demo-disclosure img { width: 100%; height: auto; margin-top: 1.1rem; border: 1px solid var(--term-line); border-radius: .7rem; box-shadow: 0 1.4rem 2.6rem -1rem var(--shadow-ink); }

/* ---------- the storyboard: the one authored moment ---------- */
.storyboard {
  display: grid; gap: .85rem; margin: 0; padding: 2.6rem 1.1rem 1.1rem;
  border: 1px solid var(--term-line); border-radius: .8rem;
  background: linear-gradient(175deg, #1b1813, var(--term-bg) 55%);
  color: var(--term-ink);
  font-family: var(--mono); font-size: .95rem;
  position: relative;
  box-shadow: 0 2.2rem 3.6rem -1.4rem rgba(20, 16, 10, .55), 0 .3rem .8rem rgba(20, 16, 10, .25);
}
.storyboard::before { content: ""; position: absolute; top: 1rem; left: 1.1rem; width: .55rem; height: .55rem; border-radius: 50%; background: #4a463e; box-shadow: 1rem 0 0 #4a463e, 2rem 0 0 #4a463e; }
.story-step { position: relative; padding: .85rem 1rem; border: 1px solid var(--term-line); border-radius: .45rem; background: var(--term-panel); }
.story-label { display: block; margin-bottom: .3rem; color: var(--term-muted); font-size: .68rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.story-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .85rem; }
.story-falsified del { text-decoration: none; color: var(--term-muted); }
.story-rule, .story-next { border-color: color-mix(in srgb, var(--term-ink) 55%, var(--term-line)); }
.story-rule strong, .story-next strong { font-weight: 600; }
.story-survivor { border-color: color-mix(in srgb, var(--term-ink) 30%, var(--term-line)); }
.story-pair { animation: story-pair 4.8s both; }
.story-falsified .strike-line { position: absolute; left: 1rem; right: 1rem; top: 58%; height: .22rem; border-radius: 999px; background: var(--term-accent); box-shadow: 0 0 .8rem rgba(228, 55, 79, .5); transform: scaleX(0); transform-origin: left; animation: story-strike 4.8s both; }
.story-rule { animation: story-rule 4.8s both; }
.story-next { animation: story-next 4.8s both; }
@keyframes story-pair { 0%, 10% { opacity: 0; transform: translateY(.4rem); } 24%, 100% { opacity: 1; transform: translateY(0); } }
@keyframes story-strike { 0%, 30% { transform: scaleX(0); } 46%, 100% { transform: scaleX(1); } }
@keyframes story-rule { 0%, 52% { opacity: 0; transform: translateY(.45rem); } 68%, 100% { opacity: 1; transform: translateY(0); } }
@keyframes story-next { 0%, 74% { opacity: 0; transform: translateY(.45rem); } 90%, 100% { opacity: 1; transform: translateY(0); } }

/* ---------- actions ---------- */
.actions, .share-links { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.2rem; }
.button { min-height: 44px; display: inline-flex; align-items: center; padding: .65rem 1.3rem; background: var(--ink); color: var(--paper); font-weight: 700; text-decoration: none; border-radius: .35rem; border: 2px solid var(--ink); transition: transform .15s ease-out, box-shadow .15s ease-out; }
.button:hover { color: var(--paper); transform: translateY(-2px); box-shadow: 0 .6rem 1.2rem -0.4rem var(--shadow-ink); }
.button-secondary { background: transparent; color: var(--ink); }
.button-secondary:hover { color: var(--ink); }

/* ---------- outcome ---------- */
.outcome-pair, .files-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem; margin: 1.75rem 0; }
.files-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.outcome-pair article, .files-grid article { padding: 1.4rem 1.5rem; background: var(--panel); border: 1px solid var(--line); border-radius: .55rem; box-shadow: 0 .5rem 1.4rem -0.9rem var(--shadow-ink); }
.outcome-pair article:first-child h3 { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--accent); text-decoration-thickness: .12em; }
.files-grid h3 { font-family: var(--mono); font-size: .98rem; font-weight: 600; }
.outcome-pair p, .files-grid p { margin-bottom: 0; color: var(--muted); }
.activation-note, .axes-note { font-weight: 700; }

/* ---------- mechanism ---------- */
.how-it-works { margin: 1.9rem 0 2.4rem; }
.how-it-works img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: .55rem; background: var(--paper); box-shadow: 0 .5rem 1.4rem -0.9rem var(--shadow-ink); }
.how-it-works figcaption { margin-top: .7rem; color: var(--muted); font-size: .95rem; }
.contrast-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem; }
.transcript, .rule { padding: 1.4rem 1.5rem; background: var(--panel); border: 1px solid var(--line); border-radius: .55rem; box-shadow: 0 .5rem 1.4rem -0.9rem var(--shadow-ink); }
.transcript del { text-decoration-thickness: .14em; text-decoration-color: var(--accent); color: var(--muted); }
.falsified { border-top: 4px solid var(--accent); }
.survivor { border-top: 4px solid var(--survivor); }
.card-label { margin: 0 0 1rem; color: var(--muted); font-size: .74rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.falsified .card-label { color: var(--accent); }
.survivor .card-label { color: var(--survivor); }
.strike-mark { font-size: 1.15rem; line-height: 1; }
.proof-rail { display: flex; flex-wrap: wrap; align-items: baseline; gap: .75rem; margin: 2.4rem 0 .4rem; font-family: var(--serif); font-size: clamp(1.15rem, 2.4vw, 1.6rem); font-weight: 700; font-variant-numeric: tabular-nums; }
.proof-rail b { color: var(--line); font-family: var(--sans); font-weight: 400; }
.proof-rail strong { color: var(--survivor); }
.rail-caption { margin: 0 0 1.6rem; color: var(--muted); }
.rule { margin-top: .5rem; }
.rule code, .commands code { display: block; padding: .95rem 1.1rem; overflow-x: auto; background: var(--term-bg); color: var(--term-ink); border: 1px solid var(--term-line); border-radius: .45rem; font: .92rem/1.55 var(--mono); white-space: pre; }
.commands code { white-space: pre-wrap; overflow-wrap: anywhere; word-break: break-word; }
.rule code::selection, .commands code::selection { background: var(--term-accent); color: var(--term-bg); }

/* ---------- start ---------- */
.install-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem; max-width: 60rem; margin-top: 2.2rem; }
.install-option, .activation-guide, .verification-guide, .undo-guide { padding: 1.6rem 1.7rem; background: var(--panel); border: 1px solid var(--line); border-radius: .55rem; box-shadow: 0 .5rem 1.4rem -0.9rem var(--shadow-ink); }
.install-option p, .activation-explanation, .verification-guide p { color: var(--muted); }
.install-option p:last-child, .verification-guide p { margin-bottom: 0; }
.activation-guide { max-width: 60rem; margin-top: 1.75rem; }
.activation-guide > h3 { margin-bottom: .6rem; }
.target-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1.35rem; }
.target-option { min-width: 0; padding: 1.15rem 1.1rem; border: 1px solid var(--line); border-radius: .45rem; background: color-mix(in srgb, var(--panel) 72%, var(--paper)); }
.target-option h4 { margin: 0; font-family: var(--serif); font-size: 1.03rem; line-height: 1.15; }
.target-option .commands { margin-top: .8rem; }
.verification-guide, .undo-guide { margin-top: 1rem; box-shadow: none; }
.verification-guide { display: grid; grid-template-columns: minmax(0, 1fr) minmax(14rem, .8fr); column-gap: 1rem; align-items: start; }
.verification-guide h3 { margin-bottom: .35rem; }
.verification-guide p { grid-column: 1; }
.verification-guide .commands { grid-column: 2; grid-row: 1 / span 2; margin-top: 0; }
.undo-guide { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 1rem; border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.undo-guide h3 { margin: 0; }
.undo-guide .commands { min-width: min(100%, 20rem); margin-top: 0; }
.release-link { margin: 1.1rem 0 0; }
.commands { display: grid; gap: .45rem; margin-top: 1.1rem; }
.verified-install { margin-top: 1.75rem; }
.verified-install summary { min-height: 44px; display: flex; align-items: center; width: fit-content; cursor: pointer; font-weight: 700; text-decoration: underline; text-decoration-thickness: .09em; text-underline-offset: .22em; }
.verified-install summary:hover { color: var(--accent); }
.verified-install .steps { margin-top: 1.6rem; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; padding-left: 1.4rem; }
.steps li { padding-left: .5rem; }
.steps li::marker { font-family: var(--serif); font-weight: 700; color: var(--accent); }

/* ---------- boundaries ---------- */
.boundary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 1.1rem; }
.boundary-grid article { padding: 1.4rem 1.5rem; background: var(--panel); border: 1px solid var(--line); border-radius: .55rem; }
.boundary-grid p { margin-bottom: 0; color: var(--muted); }

/* ---------- share ---------- */
blockquote { max-width: 56rem; margin: 2.2rem 0 0; padding: 0; border: 0; background: none; font-family: var(--serif); font-size: clamp(1.5rem, 3.4vw, 2.5rem); font-weight: 700; line-height: 1.25; letter-spacing: -.02em; text-wrap: balance; }
blockquote::after { content: ""; display: block; width: 4.5rem; height: .3rem; margin-top: 1.4rem; background: var(--accent); border-radius: 999px; }

/* ---------- footer ---------- */
.site-footer { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; padding: 2.5rem 0 3rem; color: var(--muted); font-size: .95rem; }
.site-footer p { margin: 0; max-width: 46rem; }
.site-footer a { color: var(--muted); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 44rem; }
  .hero-story { max-width: 46rem; }
}
@media (max-width: 760px) {
  .site-header { flex-wrap: wrap; padding-block: .6rem; gap: .4rem; position: static; }
  .primary-navigation { order: 4; width: 100%; margin-left: 0; }
  .header-repository { margin-left: auto; }
  section { padding: 4rem 0; }
  .contrast-grid, .boundary-grid, .steps, .story-pair, .outcome-pair, .files-grid, .install-options, .target-grid { grid-template-columns: 1fr; }
  .verification-guide { display: block; }
  .verification-guide .commands { margin-top: 1.1rem; }
  .undo-guide .commands { min-width: 0; flex: 1 1 16rem; }
  .site-footer { flex-direction: column; }
}

/* ---------- dark ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #24211d;
    --paper-deep: #1d1a16;
    --ink: #f5ecdf;
    --muted: #c8bcae;
    --line: #55503f;
    --line-soft: #3d382f;
    --panel: #302b25;
    --accent: #f07a63;
    --survivor: #72c4a9;
    --shadow-ink: rgba(0, 0, 0, .45);
  }
  .button { color: #241d19; }
  .button:hover { color: #241d19; }
  .button-secondary { color: var(--ink); }
  .button-secondary:hover { color: var(--ink); }
  ::selection { background: var(--accent); color: #241d19; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; }
  .story-rule, .story-next { opacity: 1; transform: none; }
  .story-falsified .strike-line { transform: scaleX(1); }
}