/* ==========================================================================
   CoreGrid — Marketing site layer.
   Builds ONLY on design-system tokens (ds/tokens/*) and component classes
   (ds/styles/components.css). No new colors, radii or shadows are invented.
   ========================================================================== */

/* ---------- Localization ---------------------------------------------
   The DS font stacks are Latin-first. Traditional-Chinese copy needs the
   brand TC face plus system TC fallbacks appended — same tokens, longer
   fallback chain. No new families are introduced.
   ---------------------------------------------------------------------- */
:root {
  --font-display: "Vivo Sans TC", "Inter", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  --font-sans: "Inter", "Vivo Sans TC", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
}

/* ---------- Page shell ------------------------------------------------ */
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body { overflow-x: hidden; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent-primary); color: var(--accent-on-primary);
  padding: var(--space-3) var(--space-4); border-radius: 0 0 var(--radius-sm) 0;
  font-size: var(--fs-body-sm); font-weight: var(--fw-semibold);
}
.skip-link:focus { left: 0; }

.cg-overline--on-dark { color: var(--text-on-dark-muted); }

/* ---------- Nav ------------------------------------------------------- */
.site-nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  background: transparent;
  transition: background var(--dur-base) var(--ease-standard),
              border-color var(--dur-base) var(--ease-standard);
  border-bottom: 1px solid transparent;
}
.site-nav--scrolled {
  background: rgba(11, 13, 26, 0.72);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom-color: var(--border-on-dark);
}
.site-nav__inner {
  display: flex; align-items: center; gap: var(--space-6);
  height: var(--nav-height);
}
.site-nav__logo { display: flex; align-items: center; }
.site-nav__logo img { height: 52px; width: auto; }

.site-nav__links { display: flex; align-items: center; gap: var(--space-6); margin-left: auto; }
.site-nav__links a {
  color: rgba(255, 255, 255, 0.82); font-size: var(--fs-body-sm); font-weight: var(--fw-medium);
  transition: color var(--dur-fast) var(--ease-standard);
}
.site-nav__links a:hover,
.site-nav__links a.is-active { color: var(--cg-white); text-decoration: none; }

.site-nav__actions { display: flex; align-items: center; gap: var(--space-4); }
.lang-switch .cg-segmented__item { padding: 6px 12px; font-size: var(--fs-caption); white-space: nowrap; }

.nav-toggle {
  display: none; width: 40px; height: 40px; border: 1px solid var(--border-on-brand);
  border-radius: var(--radius-sm); background: transparent;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.nav-toggle span { display: block; width: 16px; height: 1.5px; background: var(--cg-white); }

/* ---------- Hero ------------------------------------------------------ */
.hero {
  position: relative; display: flex; align-items: center; overflow: hidden;
  min-height: 760px; padding: calc(var(--nav-height) + var(--space-8)) 0 var(--space-9);
  background: var(--surface-brand);
}
.hero__art {
  position: absolute; right: 0; top: 0; height: 100%; width: 48%;
  object-fit: cover; object-position: left center;
}
.hero__scrim {
  position: absolute; inset: 0;
  background: linear-gradient(90deg,
    var(--cg-indigo-700) 36%, rgba(30, 19, 174, 0.42) 58%, rgba(30, 19, 174, 0) 78%);
}
.hero__wire { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.16; }
.hero__wire line { stroke: var(--cg-white); stroke-width: 1; }

/* min-width:0 keeps this flex item shrinkable below the intrinsic width of
   the nowrap CTA row on narrow screens. */
.hero__inner { position: relative; width: 100%; min-width: 0; }
.hero__title {
  font-size: var(--fs-display-2xl); line-height: var(--lh-tight); letter-spacing: var(--ls-display);
  color: var(--text-on-brand); margin: var(--space-5) 0 0;
}
.hero__lede {
  font-size: var(--fs-body-lg); line-height: var(--lh-body);
  color: rgba(255, 255, 255, 0.78); max-width: 34em;
  margin: var(--space-5) 0 var(--space-6);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* ---------- Stats band ------------------------------------------------ */
.stats-band { background: var(--surface-dark); padding: var(--space-8) 0; }
.stats-band__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.stat-rule { border-left: 2px solid var(--accent-primary); padding-left: var(--space-5); }
.stat-rule__value {
  font-family: var(--font-display); font-weight: var(--fw-semibold);
  font-size: var(--fs-display-lg); line-height: 1; color: var(--cg-white);
}
.stat-rule__value span { font-family: var(--font-sans); font-size: var(--fs-h3); font-weight: var(--fw-medium); }
.stat-rule__label {
  margin-top: var(--space-3); font-size: var(--fs-body-sm); color: var(--text-on-dark-muted);
}

/* ---------- Section scaffolding --------------------------------------- */
.section { padding: var(--space-9) 0; }
.section--light { background: var(--surface-page); }
.section--subtle { background: var(--surface-subtle); }
.section--dark { background: var(--surface-dark); }

.section__head { max-width: 720px; margin-bottom: var(--space-8); }
.section__title {
  font-size: var(--fs-display-lg); line-height: var(--lh-snug); letter-spacing: var(--ls-display);
  margin: var(--space-3) 0 var(--space-4);
  text-wrap: balance;
}
.section__lede { font-size: var(--fs-body-lg); line-height: var(--lh-body); color: var(--text-body); }
.section--dark .section__title { color: var(--cg-white); }
.section--dark .section__lede { color: var(--text-on-dark-muted); }

.section__subhead { margin: var(--space-9) 0 var(--space-6); }
.section__subhead .cg-h1 { margin-top: var(--space-3); }
.section__foot { margin-top: var(--space-8); display: flex; justify-content: center; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); }

/* ---------- About ----------------------------------------------------- */
.about__split {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); align-items: center;
}
.about__media { position: relative; margin: 0; }
.about__media img {
  width: 100%; height: 100%; max-height: 480px; object-fit: cover;
  border-radius: var(--radius-lg);
}
.about__badge {
  position: absolute; right: calc(-1 * var(--space-4)); bottom: calc(-1 * var(--space-4));
  background: var(--surface-brand); color: var(--text-on-brand);
  border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg); text-align: center;
}
.about__badge-value {
  display: block; font-family: var(--font-display); font-size: var(--fs-display-lg);
  font-weight: var(--fw-semibold); line-height: 1; font-variant-numeric: tabular-nums;
}
.about__badge-label { display: block; margin-top: 6px; font-size: var(--fs-caption); opacity: 0.8; }

.about__copy > p { margin-top: var(--space-4); line-height: var(--lh-body); }
.about__copy .cg-btn { margin-top: var(--space-6); }

.fact-list {
  list-style: none; margin: var(--space-6) 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4);
}
.fact-list li { border-left: 2px solid var(--cg-blue-600); padding-left: var(--space-4); }
.fact-list__k {
  display: block; font-family: var(--font-display); font-size: var(--fs-h3);
  font-weight: var(--fw-semibold); color: var(--text-strong);
}
.fact-list__v { display: block; margin-top: 4px; font-size: var(--fs-body-sm); color: var(--text-muted); }

/* ---------- Feature cards --------------------------------------------- */
.feature { display: flex; flex-direction: column; gap: var(--space-3); }
.feature__icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: var(--radius-md);
  background: var(--cg-indigo-050); color: var(--cg-indigo-700);
}
.feature__icon svg { width: 22px; height: 22px; }
.feature__title { font-family: var(--font-display); font-size: var(--fs-h4); color: var(--text-strong); }
.feature__desc { font-size: var(--fs-body-sm); line-height: var(--lh-body); color: var(--text-body); }

/* ---------- Process --------------------------------------------------- */
.process { list-style: none; margin: 0; padding: 0; }
.process__step {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); align-items: center;
  padding: var(--space-8) 0; border-top: 1px solid var(--border-on-dark);
}
.process__step:nth-child(even) .process__body { order: 2; }
.process__num {
  font-family: var(--font-display); font-size: var(--fs-h2); font-weight: var(--fw-semibold);
  color: var(--accent-primary); line-height: 1;
}
.process__title {
  font-size: var(--fs-h1); color: var(--cg-white); margin: var(--space-3) 0 var(--space-4);
  letter-spacing: var(--ls-heading);
}
.process__desc { color: var(--text-on-dark-muted); line-height: var(--lh-body); max-width: 46em; }
.process__media { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--inset-hairline); }
.process__media img { width: 100%; height: 320px; object-fit: cover; }

.ticks { list-style: none; margin: var(--space-5) 0 0; padding: 0; display: grid; gap: var(--space-2); }
.ticks li {
  position: relative; padding-left: var(--space-5);
  font-size: var(--fs-body-sm); color: var(--cg-gray-300);
}
.ticks li::before {
  content: ""; position: absolute; left: 0; top: 0.55em;
  width: 8px; height: 8px; border: 1.5px solid var(--accent-data); transform: rotate(45deg);
}
.ticks--light li { color: var(--text-body); }
.ticks--light li::before { border-color: var(--cg-blue-600); }

/* ---------- Solutions ------------------------------------------------- */
.solution {
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-base) var(--ease-standard), transform var(--dur-base) var(--ease-standard);
}
.solution:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.solution__media { position: relative; height: 220px; background: var(--surface-dark); }
.solution__media img { width: 100%; height: 100%; object-fit: cover; }
.solution__tag {
  position: absolute; left: var(--space-4); top: var(--space-4);
  background: var(--surface-brand); color: var(--text-on-brand);
  font-size: var(--fs-overline); font-weight: var(--fw-semibold); letter-spacing: 0.02em;
  padding: 4px 10px; border-radius: var(--radius-pill);
}
.solution__body { padding: var(--space-5); display: flex; flex-direction: column; flex: 1; }
.solution__body > p { margin-top: var(--space-3); font-size: var(--fs-body-sm); line-height: var(--lh-body); }
.solution__body .ticks { margin-bottom: var(--space-5); }

.link-arrow {
  margin-top: auto; display: inline-flex; align-items: center; gap: 6px;
  font-size: var(--fs-body-sm); font-weight: var(--fw-semibold); color: var(--text-link);
}
.link-arrow svg { width: 16px; height: 16px; transition: transform var(--dur-fast) var(--ease-standard); }
.link-arrow:hover { text-decoration: none; }
.link-arrow:hover svg { transform: translateX(3px); }

/* ---------- Spec table ------------------------------------------------ */
.spec {
  margin-top: var(--space-9); background: var(--surface-dark);
  border-radius: var(--radius-lg); padding: var(--space-7);
  box-shadow: var(--inset-hairline);
}
.spec__head { margin-bottom: var(--space-6); }
.spec__title {
  font-family: var(--font-display); font-size: var(--fs-h1); color: var(--cg-white);
  margin-top: var(--space-3); letter-spacing: var(--ls-heading);
}
.spec__table { width: 100%; border-collapse: collapse; text-align: left; }
.spec__table th {
  font-size: var(--fs-overline); font-weight: var(--fw-semibold); letter-spacing: var(--ls-overline);
  text-transform: uppercase; color: var(--text-on-dark-muted);
  padding-bottom: var(--space-3); border-bottom: 1px solid var(--border-on-dark);
}
.spec__table td {
  padding: var(--space-4) var(--space-4) var(--space-4) 0;
  border-bottom: 1px solid var(--border-on-dark);
  font-size: var(--fs-body-sm); color: var(--cg-gray-300); vertical-align: top;
}
.spec__table td:first-child { color: var(--cg-white); font-weight: var(--fw-medium); white-space: nowrap; }
.spec__table tr:last-child td { border-bottom: none; }

/* ---------- Cases ----------------------------------------------------- */
.case-filter { margin-bottom: var(--space-6); flex-wrap: wrap; }
.case {
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-base) var(--ease-standard), transform var(--dur-base) var(--ease-standard);
}
.case:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.case[hidden] { display: none; }
.case__media { position: relative; height: 200px; background: var(--surface-dark); }
.case__media img { width: 100%; height: 100%; object-fit: cover; }
.case__cat {
  position: absolute; left: var(--space-4); top: var(--space-4);
  background: rgba(11, 13, 26, 0.72); color: var(--cg-white);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  font-size: var(--fs-overline); font-weight: var(--fw-semibold);
  padding: 4px 10px; border-radius: var(--radius-pill);
}
.case__body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.case__body > p { font-size: var(--fs-body-sm); line-height: var(--lh-body); }
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: auto; }
.case-empty {
  margin-top: var(--space-6); text-align: center; color: var(--text-muted); font-size: var(--fs-body-sm);
}

/* ---------- CTA band -------------------------------------------------- */
.cta-band {
  position: relative; overflow: hidden;
  background: var(--surface-brand-deep); padding: var(--space-10) 0;
}
.cta-band__art {
  position: absolute; right: -60px; top: 50%; transform: translateY(-50%);
  height: 460px; opacity: 0.5; pointer-events: none;
}
.cta-band__inner { position: relative; }
.cta-band__title {
  text-wrap: balance;
  font-size: var(--fs-display-xl); line-height: var(--lh-snug); letter-spacing: var(--ls-display);
  color: var(--cg-white); max-width: 16em;
}
.cta-band__lede {
  margin: var(--space-4) 0 var(--space-6); font-size: var(--fs-body-lg);
  color: rgba(255, 255, 255, 0.72); max-width: 32em;
}

/* ---------- Contact --------------------------------------------------- */
.contact { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: var(--space-8); align-items: start; }

.info-list { list-style: none; margin: var(--space-5) 0 0; padding: 0; display: grid; gap: var(--space-5); }
.info-list li { display: flex; gap: var(--space-4); }
.info-list__icon {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 40px; height: 40px; border-radius: var(--radius-md);
  background: var(--cg-blue-050); color: var(--cg-blue-600);
}
.info-list__icon svg { width: 20px; height: 20px; }
.info-list strong {
  display: block; font-size: var(--fs-caption); font-weight: var(--fw-semibold);
  color: var(--text-muted); margin-bottom: 2px;
}
.info-list span > span,
.info-list a { font-size: var(--fs-body-sm); color: var(--text-strong); }
.info-list a:hover { color: var(--text-link); }

.contact__map { margin: var(--space-6) 0 0; }
.contact__map img {
  width: 100%; height: 220px; object-fit: cover;
  border-radius: var(--radius-lg); border: 1px solid var(--border-subtle);
}

.contact__form { display: grid; gap: var(--space-4); }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.cg-textarea { height: auto; padding: var(--space-3) var(--space-4); line-height: var(--lh-body); resize: vertical; }
.cg-field__error { font-size: var(--fs-caption); color: var(--cg-danger); min-height: 1em; }
.cg-input[aria-invalid="true"], .cg-select[aria-invalid="true"] { border-color: var(--cg-danger); }

.consent { display: flex; gap: var(--space-3); align-items: flex-start; font-size: var(--fs-caption); color: var(--text-body); }
.consent input { margin-top: 3px; accent-color: var(--cg-blue-600); width: 16px; height: 16px; flex: none; }

.form-status { font-size: var(--fs-body-sm); min-height: 1.2em; }
.form-status--ok { color: var(--cg-success); }
.form-status--err { color: var(--cg-danger); }

/* ---------- Footer ---------------------------------------------------- */
.site-footer { background: var(--surface-dark); padding: var(--space-8) 0 var(--space-5); }
.site-footer__grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: var(--space-7);
}
.site-footer__brand img { height: 48px; width: auto; margin-bottom: var(--space-4); }
.site-footer__brand p {
  font-size: var(--fs-body-sm); line-height: var(--lh-body); color: var(--text-on-dark-muted); max-width: 32em;
}
.site-footer__legal {
  margin-top: var(--space-3); font-size: var(--fs-caption); color: var(--cg-gray-500);
}
.site-footer__col { display: flex; flex-direction: column; gap: var(--space-3); }
.site-footer__col h4 {
  font-family: var(--font-display); font-size: var(--fs-body); color: var(--cg-white); margin-bottom: var(--space-1);
}
.site-footer__col a, .site-footer__col span {
  font-size: var(--fs-body-sm); color: var(--text-on-dark-muted);
  transition: color var(--dur-fast) var(--ease-standard);
}
.site-footer__col a:hover { color: var(--cg-white); text-decoration: none; }
.site-footer__bar {
  margin-top: var(--space-7); padding-top: var(--space-5); border-top: 1px solid var(--border-on-dark);
  display: flex; justify-content: space-between; gap: var(--space-4);
  font-size: var(--fs-caption); color: var(--cg-gray-500);
}

/* ---------- Motion ---------------------------------------------------- */
@keyframes cgfade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
/* Gated on .cg-js so copy is never hidden when JS is off or fails. */
.cg-js .cg-fade { opacity: 0; }
.cg-js .cg-fade.is-visible { animation: cgfade var(--dur-slow) var(--ease-out) forwards; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cg-js .cg-fade { opacity: 1; animation: none; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- Responsive ------------------------------------------------ */
@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .hero__title { font-size: var(--fs-display-xl); }
}

@media (max-width: 900px) {
  .site-nav__links {
    position: absolute; inset: var(--nav-height) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(11, 13, 26, 0.96);
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-on-dark);
    padding: var(--space-2) var(--gutter) var(--space-4);
    display: none;
  }
  .site-nav__links.is-open { display: flex; }
  .site-nav__links a { padding: var(--space-3) 0; border-bottom: 1px solid var(--border-on-dark); }
  .site-nav--scrolled, .site-nav:has(.is-open) { background: rgba(11, 13, 26, 0.92); }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }

  .stats-band__grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .about__split, .contact { grid-template-columns: 1fr; }
  .process__step { grid-template-columns: 1fr; gap: var(--space-5); }
  .process__step:nth-child(even) .process__body { order: 0; }
  .hero__art { width: 100%; opacity: 0.45; }
  .hero__scrim { background: linear-gradient(180deg, rgba(30, 19, 174, 0.92) 30%, rgba(30, 19, 174, 0.72) 100%); }
}

@media (max-width: 640px) {
  .site-nav__logo img { height: 40px; }
  .section { padding: var(--space-8) 0; }
  .hero { min-height: 620px; }
  .hero__title { font-size: 2.5rem; }
  .section__title { font-size: var(--fs-h1); }
  .cta-band__title { font-size: var(--fs-display-lg); }
  .stats-band__grid, .grid-3, .grid-4, .form-grid, .fact-list,
  .site-footer__grid { grid-template-columns: 1fr; }
  .about__badge { right: var(--space-4); bottom: var(--space-4); }
  .spec { padding: var(--space-5); }
  .spec__table td:first-child { white-space: normal; }
  .site-footer__bar { flex-direction: column; }
  .hero__actions .cg-btn { flex: 1 1 auto; }
}