/*
  Shared design system for the embodied-ai-services sites.
  Tokens follow docs/DESIGN.md section 2. Per-site --accent / --accent-ink
  are injected per page in an inline <style> by templates/page.js.
*/

:root {
  /* type */
  --font-sans: "Manrope", "Noto Sans TC", system-ui, -apple-system, sans-serif;

  /* neutrals - light (default) */
  --bg: #FBFBFA;
  --surface: #FFFFFF;
  --text: #161616;
  --muted: #5C5C58;
  --hairline: rgba(0, 0, 0, 0.08);

  /* radius */
  --radius-card: 16px;
  --radius-button: 12px;
  --radius-input: 10px;

  /* shadow (light mode only) */
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);

  /* spacing */
  --space-section-desktop: 128px;
  --space-section-mobile: 72px;
  --container-max: 1120px;
  --container-pad-desktop: 24px;
  --container-pad-mobile: 16px;

  /* motion */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --duration-reveal: 400ms;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0E0E0F;
    --surface: #161618;
    --text: #F2F2F0;
    --muted: #A3A39E;
    --hairline: rgba(255, 255, 255, 0.1);
    --shadow-1: none;
  }
}

:root[data-theme="dark"] {
  --bg: #0E0E0F;
  --surface: #161618;
  --text: #F2F2F0;
  --muted: #A3A39E;
  --hairline: rgba(255, 255, 255, 0.1);
  --shadow-1: none;
}

:root[data-theme="light"] {
  --bg: #FBFBFA;
  --surface: #FFFFFF;
  --text: #161616;
  --muted: #5C5C58;
  --hairline: rgba(0, 0, 0, 0.08);
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

html, body {
  max-width: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

@media (max-width: 720px) {
  body {
    font-size: 17px;
  }
}

/* TwinSite immersive 3D showcase — actual interactive delivery sample. */
.site--twinsite {
  --bg: #080d19;
  --surface: #10182b;
  --text: #eef3ff;
  --muted: #93a0bd;
  --hairline: rgba(150, 170, 220, .2);
  --accent: #5b8cff;
  --accent-ink: #fff;
  background:
    radial-gradient(70% 40% at 50% 0%, rgba(49, 80, 150, .28), transparent 70%),
    #080d19;
  background-image:
    linear-gradient(rgba(91,140,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91,140,255,.035) 1px, transparent 1px),
    radial-gradient(70% 40% at 50% 0%, rgba(49,80,150,.28), transparent 70%);
  background-size: 48px 48px, 48px 48px, 100% 100%;
}

.site--twinsite .nav {
  background: rgba(8, 13, 25, .84);
  border-color: var(--hairline);
}

.site--twinsite .hero--3d {
  min-height: 0;
  padding: 88px 24px 0;
  overflow: hidden;
  position: relative;
}

.site--twinsite .hero--3d::before {
  content: "";
  position: absolute;
  width: min(80vw, 1100px);
  height: min(80vw, 1100px);
  left: 50%;
  top: 180px;
  transform: translateX(-50%) rotateX(68deg) rotateZ(45deg);
  border: 1px solid rgba(91,140,255,.16);
  box-shadow: inset 0 0 120px rgba(91,140,255,.08);
  pointer-events: none;
}

.site--twinsite .hero__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: end;
  position: relative;
  z-index: 1;
  padding-bottom: 64px;
}

.site--twinsite .hero--3d .hero__copy { max-width: 980px; }
.site--twinsite .hero--3d h1 { max-width: 950px; font-size: clamp(58px, 7vw, 104px); }
.site--twinsite .hero--3d .hero__subtitle { max-width: 680px; color: #b7c3dc; }

.site--twinsite .hero__coordinates {
  display: grid;
  gap: 8px;
  justify-items: end;
  color: #6d7d9f;
  font: 500 11px/1.3 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: .12em;
}

.site--twinsite .hero__coordinates span:last-child { color: #76dda8; }

.site--twinsite .hero__stage-wrap {
  width: min(1640px, calc(100vw - 48px));
  margin: 0 auto;
  border: 1px solid rgba(150,170,220,.3);
  border-radius: 18px 18px 0 0;
  background: #080d19;
  box-shadow: 0 -20px 100px rgba(27,58,127,.2), 0 40px 100px rgba(0,0,0,.5);
  overflow: hidden;
  position: relative;
  z-index: 2;
}

.site--twinsite .hero__stage-head {
  min-height: 48px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  padding: 0 18px;
  border-bottom: 1px solid rgba(150,170,220,.2);
  color: #71809f;
  font: 500 10px/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.site--twinsite .hero__stage-head strong { color: #dfe8fa; font-size: 12px; }
.site--twinsite .hero__stage-head span:last-child { text-align: right; }
.site--twinsite .hero__stage { display: block; width: 100%; height: min(78vh, 860px); min-height: 620px; border: 0; background: #080d19; }

.site--twinsite .proof { background: #080d19; }
.site--twinsite .proof__grid { max-width: none; }

.site--twinsite section:not(.hero):not(.proof) { position: relative; }
.site--twinsite section:not(.hero):not(.proof)::after {
  content: "";
  position: absolute;
  right: max(24px, calc((100vw - 1240px) / 2));
  top: 72px;
  width: 90px;
  height: 90px;
  border: 1px solid rgba(91,140,255,.16);
  transform: rotateX(62deg) rotateZ(45deg);
  box-shadow: 12px -12px 0 rgba(91,140,255,.035), 24px -24px 0 rgba(91,140,255,.025);
  pointer-events: none;
}

.site--twinsite .problem__grid,
.site--twinsite .deliverables__grid,
.site--twinsite .why__grid,
.site--twinsite .audience__grid,
.site--twinsite .pricing__grid {
  perspective: 1200px;
  border-color: rgba(150,170,220,.2);
}

.site--twinsite .card,
.site--twinsite .audience__col,
.site--twinsite .pricing__card {
  background:
    linear-gradient(145deg, rgba(91,140,255,.09), transparent 45%),
    rgba(13,19,35,.72);
  border-color: rgba(150,170,220,.2);
  backdrop-filter: blur(10px);
  transition: transform .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
  transform-style: preserve-3d;
}

.site--twinsite .card:hover,
.site--twinsite .audience__col:hover,
.site--twinsite .pricing__card:hover {
  background: #141f38;
  border-color: rgba(91,140,255,.52);
  transform: translateY(-6px) rotateX(1.5deg);
}

.site--twinsite .how { background: #0c1426; }
.site--twinsite .how__list { background: rgba(150,170,220,.18); border-color: rgba(150,170,220,.18); perspective: 1200px; }
.site--twinsite .how__step {
  background: linear-gradient(155deg, rgba(91,140,255,.1), transparent 50%), #10182b;
  min-height: 250px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  overflow: hidden;
}
.site--twinsite .how__step::before {
  content: "";
  position: absolute;
  width: 110px;
  height: 110px;
  right: -28px;
  top: -28px;
  border: 1px solid rgba(91,140,255,.22);
  transform: rotateX(62deg) rotateZ(45deg);
  box-shadow: 10px -10px 0 rgba(91,140,255,.05), 20px -20px 0 rgba(91,140,255,.035);
}
.site--twinsite .how__index { margin-bottom: auto; }

.site--twinsite .status { background: #060a14; }
.site--twinsite .contact { background: #0c1426; }
.site--twinsite .contact__aside { background: linear-gradient(145deg, #18284b, #0d1424); }
.site--twinsite .field input,
.site--twinsite .field select,
.site--twinsite .field textarea { background: #080d19; border-color: rgba(150,170,220,.28); }

@media (max-width: 960px) {
  .site--twinsite .hero__intro { grid-template-columns: 1fr; }
  .site--twinsite .hero__coordinates { display: none; }
  .site--twinsite .hero__stage { height: 720px; min-height: 0; }
}

@media (max-width: 720px) {
  .site--twinsite .hero--3d { padding: 54px 12px 0; }
  .site--twinsite .hero--3d h1 { font-size: 46px; }
  .site--twinsite .hero__intro { padding-bottom: 42px; }
  .site--twinsite .hero__stage-wrap { width: 100%; border-radius: 12px 12px 0 0; }
  .site--twinsite .hero__stage-head { grid-template-columns: 1fr; gap: 4px; padding: 12px 14px; }
  .site--twinsite .hero__stage-head strong { grid-row: 1; }
  .site--twinsite .hero__stage-head span:last-child { text-align: left; }
  .site--twinsite .hero__stage { height: 760px; }
  .site--twinsite section:not(.hero):not(.proof)::after { width: 54px; height: 54px; right: 18px; top: 32px; }
  .site--twinsite .how__step { min-height: 220px; }
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.1;
  font-weight: 700;
}

h1 {
  font-size: 64px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 36px;
}

h3 {
  font-size: 24px;
}

p {
  margin: 0;
}

:lang(zh-Hant) h1, :lang(zh-Hant) h2, :lang(zh-Hant) h3 {
  letter-spacing: 0.01em;
}

@media (max-width: 720px) {
  h1 { font-size: 40px; }
  h2 { font-size: 28px; }
  h3 { font-size: 20px; }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

a {
  color: inherit;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad-desktop);
}

@media (max-width: 720px) {
  .container {
    padding: 0 var(--container-pad-mobile);
  }
}

section {
  padding: var(--space-section-desktop) 0;
}

@media (max-width: 720px) {
  section {
    padding: var(--space-section-mobile) 0;
  }
}

.eyebrow {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  max-width: 640px;
  margin: 16px 0 48px;
}

/* ---------------------------------------------------------------------- */
/* Buttons & form controls                                                */
/* ---------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-button);
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 150ms var(--ease), opacity 150ms var(--ease);
}

.btn:hover {
  opacity: 0.88;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--hairline);
}

.btn--small {
  padding: 0 18px;
  font-size: 15px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------------- */
/* Nav                                                                    */
/* ---------------------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--hairline);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.nav__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-button);
  border: 1px solid var(--hairline);
  background: var(--surface);
  cursor: pointer;
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 1.5px;
  margin: 0 auto;
  background: var(--text);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 15px;
  font-weight: 500;
}

.nav__links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: none;
  color: var(--muted);
}

.nav__links a:hover {
  color: var(--text);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav__lang {
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--muted);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

@media (max-width: 860px) {
  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    padding: 16px var(--container-pad-mobile) 24px;
    display: none;
  }

  .nav__menu.is-open {
    display: flex;
  }

  .nav__links {
    flex-direction: column;
    gap: 12px;
  }

  .nav__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------------------------------------------------------------------- */
/* Hero                                                                   */
/* ---------------------------------------------------------------------- */

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 64px;
  align-items: center;
  padding-top: 32px;
}

.hero__subtitle {
  color: var(--muted);
  font-size: 18px;
  margin: 24px 0 32px;
  max-width: 560px;
}

.hero__cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__figure {
  color: var(--accent);
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-1);
  padding: 24px;
}

.hero__figure svg {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 860px) {
  .hero__inner {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Cards (problem / deliverables / why)                                   */
/* ---------------------------------------------------------------------- */

.card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-1);
  padding: 32px;
}

.card h3 {
  margin-bottom: 12px;
}

.card p {
  color: var(--muted);
}

.problem__grid,
.deliverables__grid,
.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

@media (max-width: 960px) {
  .problem__grid,
  .deliverables__grid,
  .why__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Proof                                                                  */
/* ---------------------------------------------------------------------- */

.proof {
  padding-top: 0;
  padding-bottom: 0;
}

.proof__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 48px 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.proof__value {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
}

.proof__label {
  font-weight: 600;
  margin-top: 8px;
}

.proof__note {
  color: var(--muted);
  font-size: 15px;
  margin-top: 4px;
}

@media (max-width: 860px) {
  .proof__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .proof__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* How (steps)                                                            */
/* ---------------------------------------------------------------------- */

.how__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.how__step {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-1);
  padding: 24px;
  min-width: 0;
}

.how__index {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 16px;
}

.how__step h3 {
  margin-bottom: 8px;
  font-size: 20px;
}

.how__step p {
  color: var(--muted);
  font-size: 16px;
}

@media (max-width: 860px) {
  .how__list {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Audience                                                               */
/* ---------------------------------------------------------------------- */

.audience__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.audience__col {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: 32px;
}

.audience__col h3 {
  margin-bottom: 16px;
}

.audience__pain,
.audience__gain {
  color: var(--muted);
  margin-top: 8px;
}

.audience__gain {
  color: var(--text);
  font-weight: 500;
}

@media (max-width: 960px) {
  .audience__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Pricing                                                                */
/* ---------------------------------------------------------------------- */

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.pricing__card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-1);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pricing__desc {
  color: var(--muted);
}

.pricing__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.pricing__items li {
  padding-left: 20px;
  position: relative;
}

.pricing__items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1.5px;
  background: var(--accent);
}

.pricing__note {
  color: var(--muted);
  font-size: 15px;
  border-top: 1px solid var(--hairline);
  padding-top: 16px;
}

@media (max-width: 960px) {
  .pricing__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Status                                                                 */
/* ---------------------------------------------------------------------- */

.status {
  background: var(--surface);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.status__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.status__col h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--accent);
}

.status__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--muted);
}

.status__col li {
  padding-left: 20px;
  position: relative;
}

.status__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1.5px;
  background: var(--muted);
}

@media (max-width: 860px) {
  .status__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* FAQ                                                                    */
/* ---------------------------------------------------------------------- */

.faq__list {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-top: 1px solid var(--hairline);
}

.faq__item {
  border-bottom: 1px solid var(--hairline);
  padding: 20px 0;
}

.faq__item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 18px;
  min-height: 44px;
  display: flex;
  align-items: center;
  list-style: none;
}

.faq__item summary::-webkit-details-marker {
  display: none;
}

.faq__item summary::before {
  content: "+";
  color: var(--accent);
  margin-right: 12px;
  font-weight: 700;
  width: 1em;
}

.faq__item[open] summary::before {
  content: "\2212";
}

.faq__item p {
  color: var(--muted);
  margin-top: 12px;
  padding-left: calc(1em + 12px);
}

/* ---------------------------------------------------------------------- */
/* Contact                                                                */
/* ---------------------------------------------------------------------- */

.contact {
  background: var(--surface);
}

.contact__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: 48px;
}

.contact__form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 32px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field--wide {
  grid-column: 1 / -1;
}

.field label {
  font-weight: 600;
  font-size: 15px;
}

.field input,
.field select,
.field textarea {
  min-height: 44px;
  border-radius: var(--radius-input);
  border: 1px solid var(--hairline);
  background: var(--bg);
  color: var(--text);
  padding: 0 14px;
  font: inherit;
}

.field textarea {
  min-height: 120px;
  padding: 12px 14px;
  resize: vertical;
}

.field--check label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 44px;
  padding: 10px 0;
  font-weight: 400;
  font-size: 15px;
  color: var(--muted);
}

.field--check input {
  min-height: auto;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
}

.field--honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact__status {
  margin-top: 12px;
  font-weight: 600;
  min-height: 1.2em;
}

.contact__status[data-state="success"] {
  color: #1E7A4A;
}

.contact__status[data-state="error"] {
  color: #B4531A;
}

.contact__aside {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: 32px;
  align-self: start;
}

.contact__aside ul {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--muted);
}

@media (max-width: 860px) {
  .contact__inner {
    grid-template-columns: 1fr;
  }

  .contact__form {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Footer                                                                 */
/* ---------------------------------------------------------------------- */

.footer {
  border-top: 1px solid var(--hairline);
  padding: 64px 0;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.footer__tagline {
  color: var(--muted);
  margin-top: 12px;
}

.footer__contact {
  margin-top: 16px;
}

.footer__contact a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: none;
  font-weight: 600;
}

.footer__meta {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 15px;
}

.footer__meta a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: underline;
}

.footer__disclaimer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
  max-width: 640px;
}

/* ---------------------------------------------------------------------- */
/* Reveal animation                                                       */
/* ---------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-reveal) var(--ease), transform var(--duration-reveal) var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------------------------------------------------------------------- */
/* TwinSite — simulation blueprint                                        */
/* Scoped deliberately so the remaining sites retain the shared baseline. */
/* ---------------------------------------------------------------------- */

.site--twinsite {
  --bg: #f3f7f6;
  --surface: #fbfdfc;
  --text: #102a2c;
  --muted: #587074;
  --hairline: rgba(16, 42, 44, 0.14);
  --radius-card: 6px;
  --radius-button: 4px;
  --radius-input: 4px;
  --shadow-1: none;
  background-image: linear-gradient(rgba(14, 110, 142, .035) 1px, transparent 1px);
  background-size: 100% 40px;
}

.site--twinsite .container { max-width: 1240px; }

.site--twinsite .nav {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(14px);
}

.site--twinsite .nav__dot {
  width: 18px;
  height: 18px;
  border-radius: 2px;
  background: transparent;
  border: 1.5px solid var(--accent);
  position: relative;
}

.site--twinsite .nav__dot::before,
.site--twinsite .nav__dot::after {
  content: "";
  position: absolute;
  background: var(--accent);
}

.site--twinsite .nav__dot::before { width: 1px; inset: 3px auto 3px 8px; }
.site--twinsite .nav__dot::after { height: 1px; inset: 8px 3px auto; }

.site--twinsite .nav__name { letter-spacing: -.03em; }

.site--twinsite .hero {
  min-height: 760px;
  padding-top: 86px;
  padding-bottom: 84px;
}

.site--twinsite .hero__inner {
  grid-template-columns: minmax(0, .88fr) minmax(540px, 1.12fr);
  gap: clamp(48px, 7vw, 100px);
}

.site--twinsite .hero h1 {
  max-width: 720px;
  font-size: clamp(52px, 5.6vw, 82px);
  line-height: 1.02;
  letter-spacing: -.055em;
}

.site--twinsite:lang(zh-Hant) .hero h1 {
  letter-spacing: -.055em;
  text-wrap: balance;
}

.site--twinsite .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  letter-spacing: .13em;
}

.site--twinsite .eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
}

.site--twinsite .hero__subtitle { font-size: 20px; max-width: 600px; }

.site--twinsite .btn { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; letter-spacing: -.02em; }
.site--twinsite .btn--primary { box-shadow: 4px 4px 0 rgba(14, 110, 142, .18); }
.site--twinsite .btn--primary:hover { opacity: 1; transform: translate(-1px, -1px); box-shadow: 6px 6px 0 rgba(14, 110, 142, .18); }
.site--twinsite .btn--primary:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 rgba(14, 110, 142, .18); }

.site--twinsite .hero__figure {
  padding: 0;
  overflow: hidden;
  border-color: color-mix(in srgb, var(--accent) 34%, var(--hairline));
  background: color-mix(in srgb, var(--surface) 92%, var(--accent));
  transform: rotate(.4deg);
}

.site--twinsite .hero__figure::before {
  content: "DIGITAL TWIN / LIVE TEST VIEW";
  display: block;
  padding: 12px 16px;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
  font: 600 10px/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: .12em;
}

.site--twinsite .hero__figure svg { padding: 10px; }
.site--twinsite .figure__meta,
.site--twinsite .figure__panel { font: 600 11px ui-monospace, "SFMono-Regular", Consolas, monospace; letter-spacing: .08em; }
.site--twinsite .figure__route { color: #ef6a47; }
.site--twinsite .figure__hazard { color: #ef6a47; fill: color-mix(in srgb, #ef6a47 14%, transparent); }
.site--twinsite .figure__hazard-mark { color: #ef6a47; }

.site--twinsite .proof__grid {
  gap: 0;
  padding: 0;
  background: var(--text);
  color: var(--bg);
  border: 0;
}

.site--twinsite .proof__card { padding: 36px 30px; border-right: 1px solid rgba(255,255,255,.16); }
.site--twinsite .proof__card:last-child { border-right: 0; }
.site--twinsite .proof__value { color: #72d0e8; font: 500 56px/1 ui-monospace, "SFMono-Regular", Consolas, monospace; letter-spacing: -.08em; }
.site--twinsite .proof__label { font-size: 14px; letter-spacing: .02em; }
.site--twinsite .proof__note { color: rgba(255,255,255,.58); font-size: 13px; }

.site--twinsite h2 { max-width: 760px; font-size: clamp(34px, 4vw, 52px); letter-spacing: -.045em; }
.site--twinsite:lang(zh-Hant) h2 { letter-spacing: -.045em; }

.site--twinsite .problem__grid,
.site--twinsite .deliverables__grid,
.site--twinsite .why__grid,
.site--twinsite .audience__grid,
.site--twinsite .pricing__grid { gap: 0; border-top: 1px solid var(--hairline); border-left: 1px solid var(--hairline); }

.site--twinsite .card,
.site--twinsite .audience__col,
.site--twinsite .pricing__card {
  border: 0;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  padding: 36px;
}

.site--twinsite .card:hover,
.site--twinsite .audience__col:hover,
.site--twinsite .pricing__card:hover { background: var(--surface); }

.site--twinsite .how { background: #dce9e7; }
.site--twinsite .how__list { grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(16,42,44,.16); border: 1px solid rgba(16,42,44,.16); }
.site--twinsite .how__step { border: 0; border-radius: 0; background: #eef5f3; padding: 32px; }
.site--twinsite .how__index { border-radius: 2px; background: transparent; border: 1px solid var(--accent); color: var(--accent); font-family: ui-monospace, monospace; }

.site--twinsite .status { background: var(--text); color: var(--bg); }
.site--twinsite .status__grid { gap: 0; border: 1px solid rgba(255,255,255,.16); }
.site--twinsite .status__col { padding: 30px; border-right: 1px solid rgba(255,255,255,.16); }
.site--twinsite .status__col:last-child { border-right: 0; }
.site--twinsite .status__col h3 { color: #72d0e8; font-family: ui-monospace, monospace; text-transform: uppercase; letter-spacing: .06em; }
.site--twinsite .status__col ul { color: rgba(255,255,255,.66); }

.site--twinsite .faq__list { max-width: 880px; }
.site--twinsite .contact { background: #dce9e7; }
.site--twinsite .contact__aside { background: var(--text); color: var(--bg); border: 0; }
.site--twinsite .contact__aside ul { color: rgba(255,255,255,.62); }

@media (prefers-color-scheme: dark) {
  .site--twinsite:not([data-theme="light"]) {
    --bg: #0b1719;
    --surface: #102326;
    --text: #e8f2ef;
    --muted: #9fb3b4;
    --hairline: rgba(190, 224, 222, .16);
  }
  .site--twinsite:not([data-theme="light"]) .how,
  .site--twinsite:not([data-theme="light"]) .contact { background: #102326; }
  .site--twinsite:not([data-theme="light"]) .how__step { background: #132a2d; }
  .site--twinsite:not([data-theme="light"]) .proof__grid,
  .site--twinsite:not([data-theme="light"]) .status,
  .site--twinsite:not([data-theme="light"]) .contact__aside { background: #061012; }
}

@media (max-width: 960px) {
  .site--twinsite .hero { min-height: auto; }
  .site--twinsite .hero__inner { grid-template-columns: 1fr; }
  .site--twinsite .hero__figure { max-width: 680px; }
  .site--twinsite .how__list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .site--twinsite .hero { padding-top: 52px; }
  .site--twinsite .hero h1 { font-size: 44px; }
  .site--twinsite .hero__subtitle { font-size: 18px; }
  .site--twinsite .hero__figure { transform: none; }
  .site--twinsite .proof__grid,
  .site--twinsite .how__list { grid-template-columns: 1fr; }
  .site--twinsite .proof__card { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.16); }
  .site--twinsite .proof__card:last-child { border-bottom: 0; }
  .site--twinsite .status__col { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.16); }
  .site--twinsite .status__col:last-child { border-bottom: 0; }
  .site--twinsite .card,
  .site--twinsite .audience__col,
  .site--twinsite .pricing__card { padding: 28px 24px; }
}

/* Final TwinSite 3D theme assertions. Kept after the legacy scoped theme so
   the immersive delivery-sample direction wins in every color scheme. */
body.site--twinsite {
  --bg: #080d19;
  --surface: #10182b;
  --text: #eef3ff;
  --muted: #93a0bd;
  --hairline: rgba(150, 170, 220, .2);
  --accent: #5b8cff;
  --accent-ink: #fff;
}
body.site--twinsite .nav { background: rgba(8,13,25,.84); }
body.site--twinsite .hero--3d { min-height: 0; padding: 88px 24px 0; }
body.site--twinsite .hero--3d .hero__intro { grid-template-columns: minmax(0,1fr) auto; }
body.site--twinsite .proof__grid { background: #0a1426; color: #eef3ff; }
body.site--twinsite .card,
body.site--twinsite .audience__col,
body.site--twinsite .pricing__card {
  background: linear-gradient(145deg, rgba(91,140,255,.09), transparent 45%), rgba(13,19,35,.82);
}
body.site--twinsite .card:hover,
body.site--twinsite .audience__col:hover,
body.site--twinsite .pricing__card:hover { background: #141f38; }
body.site--twinsite .how { background: #0c1426; }
body.site--twinsite .how__step { background: linear-gradient(155deg, rgba(91,140,255,.1), transparent 50%), #10182b; }
body.site--twinsite .status { background: #060a14; color: #eef3ff; }
body.site--twinsite .contact { background: #0c1426; }
body.site--twinsite .contact__aside { background: linear-gradient(145deg, #18284b, #0d1424); color: #eef3ff; }

.site--twinsite .twin-layers { padding-top: 168px; padding-bottom: 168px; overflow: hidden; }
.site--twinsite .twin-layers__lead { max-width: 760px; font-size: 20px; }
.site--twinsite .twin-layers__rows { margin-top: 88px; display: grid; gap: 140px; }
.site--twinsite .twin-layer { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(320px, .82fr); gap: clamp(56px, 8vw, 120px); align-items: center; }
.site--twinsite .twin-layer--reverse { grid-template-columns: minmax(320px, .82fr) minmax(0, 1.18fr); }
.site--twinsite .twin-layer--reverse .twin-layer__visual { grid-column: 2; }
.site--twinsite .twin-layer--reverse .twin-layer__copy { grid-column: 1; grid-row: 1; }
.site--twinsite .twin-layer__visual {
  --rx: 1deg;
  --ry: 2deg;
  color: #5b8cff;
  min-width: 0;
  border: 1px solid rgba(150,170,220,.22);
  border-radius: 10px;
  background:
    linear-gradient(rgba(91,140,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91,140,255,.045) 1px, transparent 1px),
    radial-gradient(circle at 50% 30%, rgba(37,75,151,.3), transparent 66%),
    #0a1120;
  background-size: 28px 28px, 28px 28px, 100% 100%, 100% 100%;
  box-shadow: 0 36px 90px rgba(0,0,0,.3);
  transform: perspective(1200px) rotateY(var(--ry)) rotateX(var(--rx));
  transition: transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease);
}
.site--twinsite .twin-layer--reverse .twin-layer__visual { --ry: -2deg; }
.site--twinsite .twin-layer__visual:hover { border-color: rgba(102,215,255,.48); box-shadow: 0 44px 110px rgba(0,0,0,.42), 0 0 60px rgba(91,140,255,.08); }
.site--twinsite .twin-layer__visual svg { width: 100%; height: auto; display: block; }
.site--twinsite .twin-visual__label { fill: #8fa3ca; font: 600 13px ui-monospace, "SFMono-Regular", Consolas, monospace; letter-spacing: .08em; }
.site--twinsite .twin-visual__label--center { fill: #dce6f8; text-anchor: middle; font-size: 12px; }
.site--twinsite .graph-node { fill: #0d1830; stroke: #6b8dff; stroke-width: 2; }
.site--twinsite .twin-layer__copy { max-width: 520px; }
.site--twinsite .twin-layer__index { color: #6f84ad; font: 600 11px/1.4 ui-monospace, "SFMono-Regular", Consolas, monospace; letter-spacing: .1em; text-transform: uppercase; }
.site--twinsite .twin-layer__copy h3 { margin-top: 18px; font-size: clamp(32px, 3vw, 48px); letter-spacing: -.04em; }
.site--twinsite .twin-layer__copy > p:last-child { margin-top: 24px; color: #a9b7d1; font-size: 18px; line-height: 1.8; }

@keyframes twin-route-flow { to { stroke-dashoffset: -52; } }
@keyframes twin-point-pulse { 0%,100% { opacity: .5; transform: scale(.82); } 50% { opacity: 1; transform: scale(1.18); } }
@keyframes twin-line-draw { 0% { stroke-dashoffset: 900; opacity: .2; } 45%,100% { stroke-dashoffset: 0; opacity: 1; } }
@keyframes twin-node-breathe { 0%,100% { stroke-opacity: .45; fill-opacity: .72; } 50% { stroke-opacity: 1; fill-opacity: 1; } }
@keyframes twin-scan { 0% { transform: translateX(-110%); } 100% { transform: translateX(540%); } }
@keyframes twin-stage-glow { 0%,100% { box-shadow: 0 -20px 100px rgba(27,58,127,.18), 0 40px 100px rgba(0,0,0,.5); } 50% { box-shadow: 0 -20px 130px rgba(52,91,181,.3), 0 40px 110px rgba(0,0,0,.58); } }

.site--twinsite .hero__stage-wrap { animation: twin-stage-glow 7s ease-in-out infinite; }
.site--twinsite .twin-path-flow { animation: twin-route-flow 2.2s linear infinite; }
.site--twinsite .twin-route-points circle,
.site--twinsite .twin-event-points circle { transform-box: fill-box; transform-origin: center; animation: twin-point-pulse 2.4s ease-in-out infinite; }
.site--twinsite .twin-route-points circle:last-child,
.site--twinsite .twin-event-points circle:last-child { animation-delay: -1.2s; }
.site--twinsite .twin-timeline { stroke-dasharray: 900; stroke-dashoffset: 900; animation: twin-line-draw 6s var(--ease) infinite; }
.site--twinsite .twin-timeline--secondary { animation-delay: -1.1s; }
.site--twinsite .graph-links path { stroke-dasharray: 8 12; animation: twin-route-flow 3.4s linear infinite; }
.site--twinsite .graph-node circle { animation: twin-node-breathe 3s ease-in-out infinite; }
.site--twinsite .graph-node circle:nth-child(2) { animation-delay: -.6s; }
.site--twinsite .graph-node circle:nth-child(3) { animation-delay: -1.2s; }
.site--twinsite .graph-node circle:nth-child(4) { animation-delay: -1.8s; }
.site--twinsite .graph-node circle:nth-child(5) { animation-delay: -2.4s; }
.site--twinsite .twin-layer__visual::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 18%;
  background: linear-gradient(90deg, transparent, rgba(102,215,255,.08), transparent);
  pointer-events: none;
  animation: twin-scan 8s linear infinite;
}
.site--twinsite .twin-layer__visual { position: relative; overflow: hidden; }
.site--twinsite .twin-layer:nth-child(2) .twin-layer__visual::after { animation-delay: -2.6s; }
.site--twinsite .twin-layer:nth-child(3) .twin-layer__visual::after { animation-delay: -5.2s; }

.site--twinsite .proof__card.reveal.is-visible { transition-delay: calc(var(--stagger, 0) * 90ms); }
.site--twinsite .how__step.reveal.is-visible { transition-delay: calc(var(--stagger, 0) * 70ms); }

@media (max-width: 960px) {
  body.site--twinsite .hero--3d .hero__intro { grid-template-columns: 1fr; }
  .site--twinsite .twin-layer,
  .site--twinsite .twin-layer--reverse { grid-template-columns: 1fr; gap: 40px; }
  .site--twinsite .twin-layer--reverse .twin-layer__visual,
  .site--twinsite .twin-layer--reverse .twin-layer__copy { grid-column: 1; }
  .site--twinsite .twin-layer--reverse .twin-layer__visual { grid-row: 1; }
  .site--twinsite .twin-layer--reverse .twin-layer__copy { grid-row: 2; }
}

@media (max-width: 720px) {
  body.site--twinsite .hero--3d { padding: 54px 12px 0; }
  .site--twinsite .twin-layers { padding-top: 96px; padding-bottom: 96px; }
  .site--twinsite .twin-layers__rows { margin-top: 64px; gap: 88px; }
  .site--twinsite .twin-layer__visual,
  .site--twinsite .twin-layer--reverse .twin-layer__visual { transform: none; }
  .site--twinsite .twin-layer__copy > p:last-child { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  .site--twinsite .hero__stage-wrap,
  .site--twinsite .twin-path-flow,
  .site--twinsite .twin-route-points circle,
  .site--twinsite .twin-event-points circle,
  .site--twinsite .twin-timeline,
  .site--twinsite .graph-links path,
  .site--twinsite .graph-node circle,
  .site--twinsite .twin-layer__visual::after { animation: none !important; }
  .site--twinsite .twin-timeline { stroke-dashoffset: 0; }
  .site--twinsite .twin-layer__visual { transform: none !important; transition: none; }
}