/* Hallmark · see tokens.css for the full stamp */
@import url("tokens.css?v=7");

*, *::before, *::after { box-sizing: border-box; }
html { overflow-x: clip; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; overflow-x: clip;
  background: var(--color-paper); color: var(--color-ink);
  font-family: var(--font-body); font-size: var(--text-base); line-height: 1.6;
  font-variant-numeric: oldstyle-nums;
  padding-inline: max(0px, env(safe-area-inset-left)) max(0px, env(safe-area-inset-right));
}
html[lang="zh"] body { line-height: 1.75; letter-spacing: 0.01em; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 500; line-height: 1.1; letter-spacing: -0.015em; margin: 0; overflow-wrap: anywhere; min-width: 0; }
html[lang="zh"] h1, html[lang="zh"] h2, html[lang="zh"] h3 { letter-spacing: 0.01em; line-height: 1.25; }
p { margin: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }
::selection { background: var(--color-accent-soft); }

.wrap { max-width: 78rem; margin-inline: auto; padding-inline: var(--page-gutter); }

/* ---------- nav (N9 edge-aligned minimal) ---------- */
.nav { position: sticky; top: 0; z-index: var(--z-sticky); background: color-mix(in oklch, var(--color-paper) 88%, transparent); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); padding-block: var(--space-md); border-bottom: var(--rule-hair) solid var(--color-rule); }
.wordmark { font-family: var(--font-logo); font-weight: 800; font-size: 1.7rem; line-height: 1; letter-spacing: -0.035em; color: var(--color-ink); text-decoration: none; display: inline-flex; align-items: baseline; gap: var(--space-xs); white-space: nowrap; }
.wordmark__zh { font-size: var(--text-sm); color: var(--color-neutral); font-weight: 400; font-family: var(--font-body); letter-spacing: 0.08em; }
.wordmark__dot { display: inline-block; width: 0.32em; height: 0.32em; border-radius: 50%; background: var(--color-accent); margin-inline-start: 0.06em; transform: translateY(-0.02em); }
.nav__right { display: flex; align-items: center; gap: var(--space-lg); }
.nav__link { text-decoration: none; font-size: var(--text-sm); color: var(--color-muted); white-space: nowrap; border-bottom: var(--rule-hair) solid transparent; transition: color var(--dur-micro) var(--ease-out), border-color var(--dur-micro) var(--ease-out); }
.nav__link:hover { color: var(--color-ink); border-color: var(--color-accent); }
.lang { display: inline-flex; border: var(--rule-hair) solid var(--color-rule); border-radius: 999px; padding: 2px; background: var(--color-paper); }
.lang button { appearance: none; border: 0; background: transparent; color: var(--color-muted); cursor: pointer; font: inherit; font-size: var(--text-xs); font-weight: 500; padding: 0.25rem 0.65rem; border-radius: 999px; min-height: 28px; white-space: nowrap; transition: background var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out); }
.lang button[aria-pressed="true"] { background: var(--color-ink); color: var(--color-paper); }
.lang button:focus-visible { outline-offset: 1px; }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); padding-block: var(--space-2xl) var(--space-3xl); align-items: center; min-height: clamp(60vh, 72dvh, 84dvh); }
.hero__copy { max-width: 34rem; }
.hero__kicker { font-family: var(--font-outlier); font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent-ink); margin-block-end: var(--space-lg); }
.hero__title { font-size: var(--text-display); line-height: 1.02; text-wrap: balance; }
html[lang="zh"] .hero__title { line-height: 1.18; }
.hero__lede { margin-block-start: var(--space-lg); font-size: var(--text-md); color: var(--color-muted); max-width: 30rem; text-wrap: pretty; }
.hero__actions { margin-block-start: var(--space-xl); display: flex; flex-wrap: wrap; gap: var(--space-md) var(--space-lg); align-items: center; }
.btn { display: inline-flex; align-items: center; gap: var(--space-xs); min-height: 44px; padding: 0.55rem 1.1rem; border: var(--rule-hair) solid var(--color-ink); border-radius: var(--radius-sm); background: var(--color-ink); color: var(--color-paper); text-decoration: none; font-weight: 500; font-size: var(--text-sm); white-space: nowrap; transition: transform var(--dur-micro) var(--ease-out), background var(--dur-micro) var(--ease-out); }
.btn:hover { transform: translateY(-1px); background: var(--color-muted); border-color: var(--color-muted); }
.btn:active { transform: translateY(0); }
.link { text-decoration: none; border-bottom: var(--rule-hair) solid var(--color-rule); padding-bottom: 1px; font-size: var(--text-sm); white-space: nowrap; transition: border-color var(--dur-micro) var(--ease-out); }
.link:hover { border-color: var(--color-accent); }
.link__arrow { display: inline-block; transition: transform var(--dur-micro) var(--ease-out); }
.link:hover .link__arrow { transform: translateX(3px); }

.scene { position: relative; aspect-ratio: 5 / 4; width: 100%; min-width: 0; border-radius: var(--radius-md); overflow: hidden; background: var(--color-scene-bg); border: var(--rule-hair) solid var(--color-rule); cursor: grab; touch-action: pan-y; }
.scene:active { cursor: grabbing; }
.scene canvas { display: block; width: 100%; height: 100%; }
.scene__hint { position: absolute; left: var(--space-md); bottom: var(--space-sm); font-family: var(--font-outlier); font-size: var(--text-xs); color: var(--color-neutral); letter-spacing: 0.06em; pointer-events: none; }
.scene__label { position: absolute; padding: 0.2rem 0.5rem; background: var(--color-paper); border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-sm); font-family: var(--font-outlier); font-size: var(--text-xs); color: var(--color-ink); pointer-events: none; transform: translate(-50%, -140%); opacity: 0; transition: opacity var(--dur-micro) var(--ease-out); white-space: nowrap; }
.scene__label.is-on { opacity: 1; }
.scene__fallback { position: absolute; inset: 0; display: grid; place-items: center; padding: var(--space-xl); }
.scene__fallback svg { width: 100%; height: auto; max-height: 100%; }

@media (min-width: 60rem) {
  .hero { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: var(--space-2xl); }
}

/* ---------- reveal (single orchestrated entrance) ---------- */
.reveal { opacity: 0; transform: translateY(8px); animation: reveal var(--dur-long) var(--ease-out) forwards; animation-delay: calc(var(--i, 0) * 70ms); }
@keyframes reveal { to { opacity: 1; transform: none; } }

/* ---------- stages (Narrative Workflow) ---------- */
.stages { padding-block: var(--space-2xl) var(--space-3xl); border-top: var(--rule-thick) solid var(--color-ink); }
.stages__head { max-width: 40rem; margin-block-end: var(--space-2xl); }
.stages__head h2 { font-size: var(--text-xl); }
.stages__head p { margin-block-start: var(--space-md); color: var(--color-muted); }
.stage { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-lg); padding-block: var(--space-xl); border-top: var(--rule-hair) solid var(--color-rule); }
.stage__num { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 300; color: var(--color-neutral); font-variant-numeric: tabular-nums; line-height: 1; }
.stage__body h3 { font-size: var(--text-lg); }
.stage__body p { margin-block-start: var(--space-sm); color: var(--color-muted); max-width: 36rem; }
.stage__fig { margin: 0; border-radius: var(--radius-sm); overflow: hidden; border: var(--rule-hair) solid var(--color-rule); aspect-ratio: 4 / 3; background: var(--color-paper-2); }
.stage__fig img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.88) contrast(0.98); }
@media (min-width: 60rem) {
  .stage { grid-template-columns: 5rem minmax(0, 1.1fr) minmax(0, 0.9fr); gap: var(--space-2xl); align-items: start; }
  .stage:nth-child(even of .stage) { grid-template-columns: 5rem minmax(0, 0.9fr) minmax(0, 1.1fr); }
  .stage:nth-child(even of .stage) .stage__fig { order: 2; }
  .stage:nth-child(even of .stage) .stage__body { order: 3; }
}

/* ---------- thesis ---------- */
.thesis { padding-block: var(--space-3xl); background: var(--color-paper-2); }
.thesis__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
.thesis__lead { font-family: var(--font-display); font-size: var(--text-xl); line-height: 1.2; text-wrap: balance; max-width: 22ch; }
html[lang="zh"] .thesis__lead { line-height: 1.35; max-width: 18ch; }
.thesis__points { display: grid; gap: var(--space-lg); margin: 0; padding: 0; list-style: none; }
.thesis__points li { padding-inline-start: var(--space-lg); position: relative; color: var(--color-muted); max-width: 40rem; }
.thesis__points li::before { content: ""; position: absolute; left: 0; top: 0.7em; width: 0.5rem; height: 0.5rem; background: var(--color-accent); border-radius: 1px; }
.thesis__points strong { color: var(--color-ink); font-weight: 500; }
@media (min-width: 60rem) { .thesis__grid { grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: var(--space-3xl); } }

/* ---------- company ---------- */
.company { padding-block: var(--space-3xl) var(--space-2xl); }
.company__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
.company h2 { font-size: var(--text-xl); max-width: 20ch; }
.company__text { color: var(--color-muted); max-width: var(--measure); display: grid; gap: var(--space-md); }
.facts { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-lg) var(--space-xl); padding-block-start: var(--space-lg); border-top: var(--rule-hair) solid var(--color-rule); }
.facts dt { font-family: var(--font-outlier); font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-neutral); }
.facts dd { margin: var(--space-2xs) 0 0; font-weight: 500; }
@media (min-width: 60rem) { .company__grid { grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: var(--space-3xl); } }

/* ---------- careers (JD) ---------- */
.careers { padding-block: var(--space-2xl) var(--space-3xl); border-top: var(--rule-thick) solid var(--color-ink); }
.careers__head { display: grid; gap: var(--space-md); max-width: 44rem; margin-block-end: var(--space-xl); }
.careers__kicker { font-family: var(--font-outlier); font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent-ink); }
.careers__head h2 { font-size: var(--text-2xl); text-wrap: balance; }
.careers__lede { color: var(--color-muted); font-size: var(--text-md); text-wrap: pretty; }
.meta { display: flex; flex-wrap: wrap; gap: var(--space-xs); margin: var(--space-sm) 0 0; padding: 0; list-style: none; }
.meta li { font-size: var(--text-xs); padding: 0.25rem 0.7rem; border: var(--rule-hair) solid var(--color-rule); border-radius: 999px; color: var(--color-muted); background: var(--color-paper); white-space: nowrap; }
.jd { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl) var(--space-3xl); }
.jd section h3 { font-family: var(--font-body); font-size: var(--text-sm); letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-neutral); font-weight: 500; padding-block-end: var(--space-xs); border-bottom: var(--rule-hair) solid var(--color-rule); margin-block-end: var(--space-md); }
html[lang="zh"] .jd section h3 { letter-spacing: 0.25em; }
.jd ul { margin: 0; padding: 0; list-style: none; display: grid; gap: var(--space-sm); }
.jd li { position: relative; padding-inline-start: 1.3rem; color: var(--color-muted); text-wrap: pretty; }
.jd li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--color-accent); }
.jd li strong { color: var(--color-ink); font-weight: 500; }
.stack { font-family: var(--font-outlier); font-size: var(--text-sm); color: var(--color-muted); line-height: 1.9; display: grid; gap: var(--space-2xs); }
.stack b { color: var(--color-ink); font-weight: 400; }
.apply { margin-block-start: var(--space-2xl); padding: var(--space-lg) var(--space-xl); background: var(--color-accent-soft); border-left: var(--rule-thick) solid var(--color-accent); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-md) var(--space-xl); }
.apply p { max-width: 40rem; text-wrap: pretty; }
@media (min-width: 60rem) { .jd { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .jd .jd--wide { grid-column: 1 / -1; max-width: 48rem; } }

/* ---------- contact ---------- */
.contact { padding-block: var(--space-3xl); background: var(--color-ink); color: var(--color-paper); }
.contact__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); align-items: end; }
.contact h2 { font-size: var(--text-2xl); max-width: 16ch; text-wrap: balance; }
.contact__cols { display: grid; gap: var(--space-lg); }
.contact__col p { color: color-mix(in oklch, var(--color-paper) 70%, var(--color-ink)); }
.contact__col .mail { display: inline-block; margin-block-start: var(--space-xs); font-family: var(--font-outlier); font-size: var(--text-md); color: var(--color-paper); text-decoration: none; border-bottom: var(--rule-hair) solid color-mix(in oklch, var(--color-paper) 40%, transparent); transition: border-color var(--dur-micro) var(--ease-out); word-break: break-all; }
.contact__col .mail:hover { border-color: var(--color-accent); }
.contact :focus-visible { outline-color: var(--color-accent); }
@media (min-width: 60rem) { .contact__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .contact__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ---------- footer (Ft2 inline single line) ---------- */
.foot { padding-block: var(--space-lg) var(--space-xl); }
.foot__line { display: flex; flex-wrap: wrap; gap: var(--space-xs) var(--space-md); font-size: var(--text-xs); color: var(--color-neutral); border-top: var(--rule-hair) solid var(--color-rule); padding-block-start: var(--space-md); }
.foot__line a { text-decoration: none; white-space: nowrap; }
.foot__line a:hover { color: var(--color-ink); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 150ms !important; animation-iteration-count: 1 !important; transition-duration: 150ms !important; }
  .reveal { animation: reveal-reduced 150ms linear forwards; }
  @keyframes reveal-reduced { to { opacity: 1; transform: none; } }
}

/* ---------- narrow nav ---------- */
@media (max-width: 40rem) {
  .nav__right { gap: var(--space-sm); }
  .nav__link[href="#about"] { display: none; }
  .nav__link { font-size: var(--text-xs); }
  .lang button { padding: 0.25rem 0.5rem; }
  .wordmark__zh { display: none; }
}