/* ==========================================================================
   GoThink landing — dark engineering luxury
   System fonts only. Motion: transform/opacity only.
   ========================================================================== */

:root {
  /* ivory-dominant: 米白 paper surfaces, near-black ink */
  --bg: #f2efe6;
  --surface-1: #faf8f1;
  --surface-2: #e9e5d8;
  --line: rgba(23, 20, 14, 0.12);
  --line-strong: rgba(23, 20, 14, 0.26);

  /* text: warm ink scale */
  --text: #17140d;
  --text-dim: #5a5547;
  --text-faint: #8b8576;

  /* accent + semantic — ink weights, not hues:
     accept = full ink (signal), fallback = receded warm gray */
  --accent: #0e0c08;
  --accent-dim: rgba(14, 12, 8, 0.07);
  --accept: #17140d;
  --accept-dim: rgba(23, 20, 14, 0.06);
  --fallback: #7c7666;
  --fallback-dim: rgba(124, 118, 102, 0.12);

  /* ink islands: dark panels (code, intro) on the ivory page */
  --ink-bg: #14120e;
  --ink-bg-2: #0f0d0a;
  --ink-line: rgba(236, 232, 221, 0.14);
  --ink-text: #e9e4d6;
  --ink-text-faint: #97917f;

  /* type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang TC", "Noto Sans TC",
    "Microsoft JhengHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-hero: clamp(2.875rem, 1.4rem + 7vw, 6.75rem);
  --text-h2: clamp(1.625rem, 1.2rem + 2vw, 2.625rem);

  /* rhythm: deliberately uneven */
  --space-hero-top: clamp(5rem, 3rem + 9vh, 10rem);
  --space-section: clamp(5rem, 4rem + 7vw, 11rem);
  --space-tight: clamp(2.5rem, 2rem + 2vw, 4rem);
  --gutter: clamp(1.25rem, 4vw, 4.5rem);

  --duration: 600ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--bg);
  /* faint engineering grid + a single cold glow, no blobs */
  background-image:
    radial-gradient(ellipse 90rem 44rem at 18% -8%, rgba(23, 20, 14, 0.035), transparent 60%),
    linear-gradient(to right, rgba(23, 20, 14, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 20, 14, 0.036) 1px, transparent 1px);
  background-size: 100% 100%, 88px 88px, 88px 88px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.1em 0.36em;
  color: var(--accent);
  white-space: nowrap;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-dim);
  white-space: pre;
}

h1, h2, h3 { margin: 0; font-weight: 650; letter-spacing: -0.022em; }
p { margin: 0; }

a { color: var(--accent); }
a:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -200vw;
  top: 0;
  background: var(--surface-2);
  color: var(--text);
  padding: 0.6rem 1rem;
  z-index: 99;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ---------- brand intro overlay ---------- */

html.intro-lock { overflow: hidden; }
html.intro-skip .intro { display: none; }

.intro {
  position: fixed;
  inset: 0;
  z-index: 999;
  /* stays black regardless of page palette — the brand moment */
  background: #0a0a08;
  cursor: pointer;
  opacity: 1;
  transition: opacity 650ms var(--ease-out);
}
.intro.intro-fade {
  opacity: 0;
  pointer-events: none;
}

.intro-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.intro-tagline {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(0.7rem, 0.6rem + 0.5vw, 0.9rem);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  white-space: nowrap;
  color: #a8a294;
  opacity: 0;
  transition: opacity 600ms var(--ease-out);
}
.intro-tagline.is-on { opacity: 1; }
.intro-tagline::before {
  content: "//";
  color: #6f6a5d;
  margin-right: 0.7em;
}

.intro-hint {
  position: absolute;
  bottom: 1.4rem;
  right: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: #6f6a5d;
}

@media (prefers-reduced-motion: reduce) {
  .intro { display: none; }
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem var(--gutter);
  background: rgba(242, 239, 230, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text);
}
.wordmark-mark {
  align-self: center;
  width: 1.85rem;
  height: 1.85rem;
  display: block;
}
.wordmark-name { font-weight: 650; letter-spacing: -0.01em; }
.wordmark-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out),
    transform 160ms var(--ease-out);
}
.lang-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.lang-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.lang-toggle:active { transform: translateY(0); }

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  padding: 0.62rem 1.15rem;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: transform 160ms var(--ease-out), opacity 160ms var(--ease-out);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); opacity: 0.85; }

.btn-primary {
  background: var(--accent);
  color: #f4f1e8;
  font-weight: 600;
}
.btn-ghost {
  color: var(--text-dim);
  border-color: var(--line-strong);
}
.btn-ghost:hover { color: var(--text); }
.btn-lg { padding: 0.85rem 1.7rem; font-size: 0.95rem; }

/* ---------- hero ---------- */

.hero {
  position: relative;
  isolation: isolate;
  max-width: 76rem;
  margin: 0 auto;
  padding: var(--space-hero-top) var(--gutter) var(--space-tight);
}

.hero-dust {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.4rem;
}
.eyebrow::before {
  content: "//";
  color: var(--text-faint);
  margin-right: 0.7em;
}

/* brand wordmark as the title — mirrors the intro sequence */
.hero-brand {
  margin: 0;
  font-size: clamp(3.4rem, 1.6rem + 10.5vw, 9.5rem);
  line-height: 1;
  letter-spacing: -0.04em;
  font-weight: 700;
}

.hero-brand-text {
  /* ink metal: static gradient + a slow shimmer sweep */
  background: linear-gradient(
    105deg,
    var(--text) 0%,
    #4d4738 18%,
    var(--text) 34%,
    #000 58%,
    var(--text) 78%,
    #4d4738 96%
  );
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: brandShimmer 9s linear infinite;
}

@keyframes brandShimmer {
  to { background-position: -220% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-brand-text { animation: none; }
}

.hero-statement {
  margin: 1.6rem 0 0;
  font-size: clamp(1.3rem, 1rem + 1.7vw, 2.15rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  font-weight: 550;
  color: var(--text-dim);
  max-width: 30ch;
}
.hero-statement .accent {
  color: var(--accent);
}

/* CJK: neutral tracking, taller lines, no mid-word breaks */
:lang(zh-Hant) .hero-statement {
  letter-spacing: 0.01em;
  line-height: 1.5;
  word-break: keep-all;
  overflow-wrap: anywhere;
  max-width: 24em;
}
:lang(zh-Hant) h2,
:lang(zh-Hant) h3 {
  letter-spacing: 0.01em;
}
:lang(zh-Hant) p,
:lang(zh-Hant) dd,
:lang(zh-Hant) li {
  line-height: 1.75;
}

.hero-sub {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 2rem 4rem;
  margin-top: 2.2rem;
  /* off-center on purpose */
  margin-left: clamp(0rem, 6vw, 7rem);
}
.hero-sub p {
  max-width: 34rem;
  color: var(--text-dim);
  font-size: 1.07em;
}
.hero-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; }

/* metrics: one instrument panel, not four cards */
.metrics-panel {
  margin-top: clamp(3rem, 2rem + 4vw, 5.5rem);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: linear-gradient(180deg, var(--surface-1), rgba(233, 229, 216, 0.4));
  overflow: hidden;
}
.metrics-caption {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  padding: 0.7rem 1.25rem;
  border-bottom: 1px solid var(--line);
}
.caption-key {
  color: var(--fallback);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-right: 0.8em;
}
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
}
.metric {
  padding: 1.3rem 1.25rem 1.15rem;
  border-left: 1px solid var(--line);
}
.metric:first-child { border-left: none; }
.metric dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-faint);
}
.metric dd {
  margin: 0.35rem 0 0.3rem;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.6rem);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.03em;
}
.metric .unit { color: var(--accent); font-size: 0.62em; }
.metric-note { font-size: 0.78rem; color: var(--text-dim); line-height: 1.45; }

/* ---------- sections ---------- */

.section {
  max-width: 76rem;
  margin: 0 auto;
  padding: var(--space-section) var(--gutter) 0;
}

.section-head { position: relative; max-width: 38rem; }

.section-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--text-faint);
  margin-bottom: 0.9rem;
}
.section-index::after {
  content: "";
  display: inline-block;
  width: 3.5rem;
  height: 1px;
  background: var(--line-strong);
  vertical-align: middle;
  margin-left: 1rem;
}

.section h2 {
  font-size: var(--text-h2);
  line-height: 1.12;
  max-width: 22ch;
}
.section-lede {
  margin-top: 1.1rem;
  color: var(--text-dim);
}

/* ---------- demo video ---------- */
.demo-frame {
  margin: var(--space-tight) auto 0;
  max-width: 30rem;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  overflow: hidden;
  background: var(--ink-bg);
  box-shadow: 0 30px 90px rgba(23, 20, 14, 0.16);
}
.demo-video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- code panels (design objects) ---------- */

/* ink islands: the only dark surfaces on the page */
.code-panel {
  margin: 0;
  background: var(--ink-bg);
  color: var(--ink-text);
  border: 1px solid rgba(23, 20, 14, 0.55);
  border-radius: 12px;
  overflow: hidden;
}
.code-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--ink-text-faint);
  padding: 0.65rem 1.1rem;
  border-bottom: 1px solid var(--ink-line);
  background: rgba(8, 7, 5, 0.5);
}
.code-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex: none;
}
.dot-dim { background: var(--ink-text-faint); }
.dot-accent { background: #f7f2e3; }

.code-panel pre {
  margin: 0;
  padding: 1.15rem 1.25rem 1.3rem;
  overflow-x: auto;
  font-size: 0.83rem;
  line-height: 1.75;
}

/* monochrome token scheme on ink: hierarchy by brightness, not hue */
.tk-kw { color: #fdfaf0; font-weight: 600; }
.tk-str { color: #c9c4b3; }
.tk-cm { color: var(--ink-text-faint); font-style: italic; }
.tk-key { color: #f7f2e3; }
.tk-num { color: #d8d3c2; }
.tk-ok { color: #fdfaf0; font-weight: 600; }

.hl-line {
  display: inline-block;
  width: 100%;
  background: rgba(236, 232, 221, 0.09);
  box-shadow: -1.25rem 0 0 rgba(236, 232, 221, 0.09),
    1.25rem 0 0 rgba(236, 232, 221, 0.09);
  border-radius: 2px;
}

/* ---------- integration ---------- */

.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  margin-top: var(--space-tight);
  align-items: start;
}
.code-before { opacity: 0.78; }
.code-after { border-color: rgba(23, 20, 14, 0.85); }

.endpoint-list {
  list-style: none;
  margin: 2.2rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}
.endpoint-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.6rem;
  padding: 0.75rem 0.25rem;
  border-bottom: 1px solid var(--line);
}
.endpoint-list code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.84rem;
  white-space: pre;
}
.endpoint-list span { color: var(--text-dim); font-size: 0.88rem; }

/* ---------- pipeline ---------- */

.pipeline-grid {
  display: grid;
  grid-template-columns: minmax(16rem, 5fr) 7fr;
  gap: var(--space-tight) clamp(2rem, 6vw, 6rem);
  align-items: start;
}
.pipeline-head { position: sticky; top: 5.5rem; }

.legend {
  display: flex;
  gap: 1.4rem;
  margin-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
}
.legend-item { display: inline-flex; align-items: center; gap: 0.5rem; }
.swatch { width: 9px; height: 9px; border-radius: 2px; }
.swatch-accept { background: var(--accept); }
.swatch-fallback { background: var(--fallback); }

.pipeline-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.pipeline-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--line);
}

.stage {
  position: relative;
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 1rem;
  padding: 1.05rem 0 1.05rem 1.5rem;
}
.stage::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 1.7rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-faint);
}
.stage-route::before { background: var(--accent); }

.stage-no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  padding-top: 0.22rem;
  letter-spacing: 0.04em;
}
.stage-body h3 {
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.005em;
}
.stage-body p { color: var(--text-dim); font-size: 0.92rem; margin-top: 0.25rem; }

.stage-route {
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 0.6rem 0 0.6rem -0.25rem;
  padding: 1.2rem 1.2rem 1.2rem 1.75rem;
}

.route-branches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  margin-top: 0.95rem;
}
.branch {
  border-radius: 6px;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
}
.branch p { font-size: 0.84rem; margin-top: 0.4rem; }
.branch-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}
.branch-accept {
  background: var(--accept-dim);
  border-color: rgba(23, 20, 14, 0.45);
}
.branch-accept .branch-label { color: var(--accept); }
.branch-fallback {
  background: var(--fallback-dim);
  border-color: rgba(124, 118, 102, 0.4);
}
.branch-fallback .branch-label { color: var(--fallback); }

/* ---------- evidence ---------- */

.evidence-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 1.6rem clamp(1.6rem, 4vw, 3.5rem);
  margin-top: var(--space-tight);
  align-items: start;
}
.code-response { background: var(--ink-bg-2); }

.field-notes { margin: 0; }
.field-note {
  display: grid;
  grid-template-columns: minmax(9.5rem, auto) 1fr;
  gap: 0.3rem 1.2rem;
  padding: 0.78rem 0;
  border-bottom: 1px solid var(--line);
}
.field-note:first-child { padding-top: 0.2rem; }
.field-note dt code {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent);
  font-size: 0.84rem;
}
.field-note dd {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* ---------- flywheel ---------- */

.loop-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem 0.9rem;
  margin-top: var(--space-tight);
  font-family: var(--font-mono);
  font-size: 0.86rem;
}
.loop-node {
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--surface-1);
  padding: 0.55rem 1rem;
  color: var(--text-dim);
}
.loop-fallback {
  color: var(--fallback);
  border-color: rgba(124, 118, 102, 0.5);
  background: var(--fallback-dim);
}
.loop-accept {
  color: var(--accept);
  border-color: rgba(23, 20, 14, 0.5);
  background: var(--accept-dim);
}
.loop-arrow { color: var(--text-faint); }
.loop-return {
  color: var(--text-faint);
  font-size: 1.25rem;
  margin-left: 0.2rem;
}

.flywheel-note {
  margin-top: 2rem;
  max-width: 40rem;
  color: var(--text-dim);
  border-left: 2px solid var(--accent);
  padding-left: 1.2rem;
  font-size: 0.95rem;
}

/* ---------- CTA ---------- */

.section-cta { padding-bottom: var(--space-section); }

.cta-panel {
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background:
    radial-gradient(ellipse 50rem 22rem at 85% -20%, rgba(23, 20, 14, 0.05), transparent 65%),
    var(--surface-1);
  padding: clamp(2rem, 1.5rem + 3vw, 4rem);
}
.cta-panel h2 {
  font-size: var(--text-h2);
  max-width: 18ch;
}

.cta-steps {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}
.cta-steps li {
  color: var(--text-dim);
  font-size: 0.93rem;
  border-top: 1px solid var(--line-strong);
  padding-top: 0.9rem;
}
.step-no {
  display: block;
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.8rem;
  margin-bottom: 0.4rem;
}

/* ---------- contact form ---------- */

.cta-honeypot {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  opacity: 0;
  pointer-events: none;
}

.cta-form {
  margin-top: 2.4rem;
}

.cta-form-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem 1.4rem;
}

.form-field-message {
  grid-column: 1 / -1;
}

.form-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.form-field label .required {
  color: var(--accent);
  margin-left: 0.15em;
}

.form-field label .optional {
  color: var(--text-faint);
  font-weight: 400;
}

.form-field input,
.form-field textarea {
  display: block;
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  line-height: 1.5;
  padding: 0.6rem 0.85rem;
  transition:
    border-color 200ms var(--ease-out),
    box-shadow 200ms var(--ease-out);
}

.form-field textarea {
  resize: vertical;
  min-height: 4.2rem;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--text-faint);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-field input.has-error {
  border-color: var(--fallback);
  box-shadow: 0 0 0 3px var(--fallback-dim);
}

.form-field input.has-error:focus {
  border-color: var(--fallback);
  box-shadow: 0 0 0 3px var(--fallback-dim);
}

.field-error {
  margin: 0.3rem 0 0;
  font-size: 0.78rem;
  color: var(--fallback);
  min-height: 0;
  line-height: 1.3;
}

.cta-form-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.2rem 1.8rem;
  margin-top: 1.6rem;
}

.cta-form-actions .btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.form-status {
  font-size: 0.88rem;
  line-height: 1.45;
}

.form-status.status-success {
  color: var(--accept);
}

.form-status.status-error {
  color: var(--fallback);
}

.form-status a {
  color: var(--accent);
}

.cta-note {
  color: var(--text-faint);
  font-size: 0.84rem;
  max-width: 38rem;
  margin-top: 1.2rem;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.2rem var(--gutter) 2.8rem;
  max-width: 76rem;
  margin-inline: auto;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.7rem;
  align-items: baseline;
}
.footer-mark-icon { align-self: center; width: 1.35rem; height: 1.35rem; display: block; }
.footer-mark { font-weight: 650; color: var(--text); }
.footer-sep { color: var(--text-faint); }
.footer-dim { margin-top: 0.5rem; color: var(--text-faint); }
.footer-dim a { color: var(--text-dim); }

/* ---------- reveal animation (transform/opacity only) ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--duration) var(--ease-out),
    transform var(--duration) var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
/* no-JS: always visible */
.no-observer .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn { transition: none; }
  .btn:hover { transform: none; }
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .pipeline-grid { grid-template-columns: 1fr; }
  .pipeline-head { position: static; }
  .evidence-grid { grid-template-columns: 1fr; }
  .metrics-row { grid-template-columns: 1fr 1fr; }
  .metric:nth-child(3) { border-left: none; }
  .metric:nth-child(n + 3) { border-top: 1px solid var(--line); }
}

@media (max-width: 720px) {
  .diff-grid { grid-template-columns: 1fr; }
  .route-branches { grid-template-columns: 1fr; }
  .cta-steps { grid-template-columns: 1fr; gap: 1.1rem; }
  .hero-sub { margin-left: 0; }
  .field-note { grid-template-columns: 1fr; }
  .cta-form-fields { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .metric { padding: 1rem 0.9rem 0.9rem; }
  .metric dd { font-size: 1.55rem; }
  .site-header .btn { padding: 0.5rem 0.75rem; font-size: 0.76rem; }
  .lang-toggle { padding: 0.45rem 0.6rem; font-size: 0.72rem; }
  .header-actions { gap: 0.5rem; }
  .wordmark-tag { display: none; }
}