/* ============================================================
   YANGS (HK) Ltd — Landing Page Styles
   Design system: Bold corporate crimson, editorial spacing,
   no "AI-default" glassmorphism or neon.
   ============================================================ */

/* ---------- Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: 0;
  background: transparent;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
  line-height: 1.15;
}

p {
  margin: 0;
}

/* ---------- Design tokens ---------- */
:root {
  /* Brand & semantic colors */
  --color-red: #C7000B;            /* primary crimson */
  --color-red-hover: #A80009;
  --color-red-deep: #7A0008;
  --color-red-soft: #FBE9EB;       /* faint brand tint */
  --color-red-line: #F1C7CB;

  /* Neutrals */
  --color-ink: #161616;            /* near-black, never pure #000 */
  --color-ink-soft: #2B2B2B;
  --color-muted: #5C5C5C;
  --color-muted-soft: #8A8A8A;
  --color-line: #E4E2DF;           /* warm gray */
  --color-line-soft: #EFEDE9;
  --color-bg: #FFFFFF;
  --color-bg-warm: #FAF8F4;        /* ivory */
  --color-bg-cool: #F4F3F0;

  /* Accent (used sparingly) */
  --color-gold: #B7892A;

  /* Typography stack */
  --font-sans: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Inter', 'Noto Sans TC', -apple-system, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  /* Fluid type */
  --fs-hero: clamp(2.5rem, 6.4vw + 0.5rem, 5.25rem);
  --fs-h1:   clamp(1.875rem, 3.6vw + 0.5rem, 3rem);
  --fs-h2:   clamp(1.5rem, 2.2vw + 0.5rem, 2.25rem);
  --fs-h3:   clamp(1.125rem, 0.6vw + 1rem, 1.375rem);
  --fs-body: clamp(1rem, 0.25vw + 0.95rem, 1.125rem);
  --fs-sm:   clamp(0.8125rem, 0.15vw + 0.78rem, 0.9375rem);
  --fs-eyebrow: 0.8125rem;

  /* Fluid spacing scale */
  --space-1: clamp(0.375rem, 0.4vw, 0.625rem);
  --space-2: clamp(0.75rem, 0.8vw, 1rem);
  --space-3: clamp(1.25rem, 1.4vw, 1.75rem);
  --space-4: clamp(2rem, 2.5vw, 3rem);
  --space-5: clamp(3rem, 4vw, 5rem);
  --space-6: clamp(4rem, 6vw, 7rem);
  --space-7: clamp(5rem, 8vw, 10rem);

  /* Layout */
  --max-w: 1200px;
  --gutter: clamp(1.25rem, 4vw, 2.75rem);
  --header-h: 72px;

  /* Shape & motion */
  --radius: 2px;
  --radius-lg: 6px;
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --duration: 240ms;
}

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  inset-block-start: 1rem;
  background: var(--color-red);
  color: #fff;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius);
  font-weight: 600;
  z-index: 100;
  transform: translateY(-200%);
  transition: transform var(--duration) var(--ease-out);
}
.skip-link:focus {
  transform: translateY(0);
}

/* ---------- Buttons ---------- */
.btn {
  --btn-pad-y: 0.875rem;
  --btn-pad-x: 1.625rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: var(--btn-pad-y) var(--btn-pad-x);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  transition: background-color var(--duration) var(--ease-out),
              color var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out);
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 2px solid var(--color-red);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--color-red);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-red-hover);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}
.btn-ghost:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

/* arrow on the secondary CTA — decoupled from text so i18n swaps don't kill it */
.btn-ghost[data-i18n="hero.cta.secondary"]::after {
  content: '\2192';
  font-size: 1.05em;
  line-height: 1;
  transition: transform var(--duration) var(--ease-out);
}
.btn-ghost[data-i18n="hero.cta.secondary"]:hover::after {
  transform: translateX(4px);
}

.btn-block {
  width: 100%;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-block-end: 1px solid var(--color-line-soft);
  transition: background-color var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.98);
  border-block-end-color: var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--header-h);
  padding-block: 0.875rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--color-ink);
}
.brand-mark {
  flex: 0 0 auto;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.brand-name {
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: 0.08em;
}
.brand-sub {
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--color-muted);
  margin-block-start: 4px;
}

.nav {
  margin-inline-start: auto;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.nav-menu a {
  display: inline-block;
  padding: 0.5rem 0.25rem;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-ink-soft);
  position: relative;
  transition: color var(--duration) var(--ease-out);
}
.nav-menu a::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-red);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--duration) var(--ease-out);
}
.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--color-red);
}
.nav-menu a:hover::after,
.nav-menu a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  border-radius: var(--radius);
}
.nav-toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 1px;
  transition: transform var(--duration) var(--ease-out),
              opacity var(--duration) var(--ease-out);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding-inline-start: var(--space-3);
  border-inline-start: 1px solid var(--color-line);
}
.lang-btn {
  padding: 0.4rem 0.625rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-muted);
  border-radius: var(--radius);
  letter-spacing: 0.06em;
  transition: color var(--duration) var(--ease-out),
              background-color var(--duration) var(--ease-out);
}
.lang-btn:hover {
  color: var(--color-ink);
}
.lang-btn.is-active {
  background: var(--color-red);
  color: #fff;
}
.lang-sep {
  color: var(--color-muted-soft);
  font-size: 0.75rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--color-red);
  color: #fff;
  padding-block: var(--space-7) var(--space-6);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.hero-network {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-inner {
  max-width: 1000px;
  margin-inline: auto;
  text-align: left;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  margin-block-end: var(--space-3);
}
.hero-eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: rgba(255, 255, 255, 0.4);
}

.hero-title {
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-block-end: var(--space-3);
}
.hero-title-accent {
  color: #FFE4E7;
  display: inline-block;
  position: relative;
}
.hero-title-accent::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  bottom: 0.04em;
  height: 0.06em;
  background: #fff;
  opacity: 0.5;
}

.hero-sub {
  max-width: 56ch;
  font-size: clamp(1rem, 0.5vw + 0.95rem, 1.25rem);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.85);
  margin-block-end: var(--space-4);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block-end: var(--space-6);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  border-block-start: 1px solid rgba(255, 255, 255, 0.18);
  padding-block-start: var(--space-3);
  max-width: 640px;
}
.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.stat-num {
  font-size: clamp(1.875rem, 2vw + 1rem, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat-suffix {
  font-size: 0.55em;
  margin-inline-start: 0.15em;
  font-weight: 600;
  opacity: 0.85;
}
.stat-label {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- Section heads ---------- */
.section-head {
  margin-block-end: var(--space-5);
  max-width: 720px;
}
.section-head.reach-head {
  max-width: 100%;
  text-align: center;
  margin-inline: auto;
}
.section-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-red);
  margin-block-end: var(--space-2);
}
.section-title {
  font-size: var(--fs-h1);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-block-end: var(--space-2);
}
.section-lede {
  font-size: clamp(1.0625rem, 0.4vw + 1rem, 1.1875rem);
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 60ch;
}

/* ---------- Services ---------- */
.services {
  padding-block: var(--space-7);
  background: var(--color-bg-warm);
  border-block-start: 1px solid var(--color-line-soft);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}
@media (max-width: 1100px) {
  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 640px) {
  .service-grid {
    grid-template-columns: 1fr;
  }
}
.service-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 1.5vw + 1rem, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
  transition: transform var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}
.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border-block-start: 3px solid var(--color-red);
  opacity: 0;
  transition: opacity var(--duration) var(--ease-out);
}
.service-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-red-line);
  box-shadow: 0 12px 32px -16px rgba(199, 0, 11, 0.25);
}
.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  background: var(--color-red-soft);
  color: var(--color-red);
  border-radius: var(--radius);
}
.service-icon svg {
  width: 32px;
  height: 32px;
}
.service-title {
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.005em;
}
.service-desc {
  color: var(--color-muted);
  line-height: 1.65;
  margin-block-end: auto;
}
.service-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--color-red);
  margin-block-start: var(--space-2);
  text-transform: uppercase;
}

/* ---------- About ---------- */
.about {
  padding-block: var(--space-7);
}
  margin-block-end: var(--space-3);
}
.about-lede {
  font-size: 1.0625rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-block-end: var(--space-4);
  max-width: 56ch;
}
.about-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.about-points li {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-inline-start: var(--space-3);
  border-inline-start: 2px solid var(--color-red);
}
.about-points strong {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-ink);
}

/* ---------- Reach ---------- */
.reach {
  padding-block: var(--space-7);
  background: var(--color-bg-cool);
  border-block-start: 1px solid var(--color-line-soft);
}
.reach-head {
  margin-block-end: var(--space-5);
}
.reach-map-wrap {
  max-width: 960px;
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.reach-map {
  width: 100%;
  height: auto;
  display: block;
}
.reach-marker {
  transition: transform var(--duration) var(--ease-out);
}
.reach-marker--hq {
  transform-origin: 2249.39px 578.15px;
}
.reach-marker:hover {
  transform: scale(1.04);
}
/* Real-world basemap: tint neutral gray to a brand-soft crimson so it
   reads as "ours" without competing with the markers. */
.reach-basemap {
  filter: grayscale(1) brightness(1.18)
          contrast(0.92);
  opacity: 0.55;
  mix-blend-mode: multiply;
}

/* Subtle fade for the trade arcs so they sit underneath the markers visually */
.reach-arcs {
  filter: drop-shadow(0 0 0.5px rgba(199, 0, 11, 0.18));
}

/* Bilingual SVG labels: hide one language pair based on <html data-lang=...> */
.reach-label-en,
.reach-hq-en {
  display: inline;
}
.reach-label-zh,
.reach-hq-zh {
  display: inline;
}
html[data-lang="en"] .reach-label-zh,
html[data-lang="en"] .reach-hq-zh {
  display: none;
}
html[data-lang="zh-HK"] .reach-label-en,
html[data-lang="zh-HK"] .reach-hq-en {
  display: none;
}

@media (max-width: 720px) {
  /* Trade arcs become visual noise at small sizes — keep only the markers */
  .reach-arcs {
    opacity: 0.35;
  }
}

/* ---------- Contact ---------- */
.contact {
  padding-block: var(--space-7);
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: start;
}
.contact-copy .section-title {
  margin-block-end: var(--space-3);
}
.contact-lede {
  color: var(--color-muted);
  margin-block-end: var(--space-4);
  max-width: 50ch;
}
.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.contact-list li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-2);
  padding-block: var(--space-1);
  border-block-end: 1px solid var(--color-line-soft);
}
.contact-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-red);
  text-transform: uppercase;
}
.contact-val {
  color: var(--color-ink);
  font-size: var(--fs-body);
  transition: color var(--duration) var(--ease-out);
}
a.contact-val:hover {
  color: var(--color-red);
}

.contact-form {
  background: var(--color-bg-warm);
  border: 1px solid var(--color-line);
  padding: clamp(1.5rem, 2vw, 2rem);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.field {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}
.field label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-ink);
}
.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: 0.9375rem;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--color-ink);
  transition: border-color var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 0;
  border-color: var(--color-red);
  box-shadow: 0 0 0 3px rgba(199, 0, 11, 0.12);
}
.field textarea {
  resize: vertical;
  min-height: 96px;
}
.field select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%23161616' stroke-width='1.5' stroke-linecap='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.875rem center;
  background-size: 12px;
  padding-inline-end: 2.25rem;
}

.form-status {
  font-size: var(--fs-sm);
  color: var(--color-muted);
  min-height: 1.2em;
  margin-block-start: 0.25rem;
}
.form-status.is-success { color: #1B7B2C; }
.form-status.is-error   { color: var(--color-red); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.7);
  padding-block: var(--space-4);
}
.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.875rem;
}
.footer-meta {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}
.footer-nav {
  display: flex;
  gap: var(--space-3);
}
.footer-nav a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--duration) var(--ease-out);
}
.footer-nav a:hover {
  color: var(--color-red);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 960px) {
  .contact-inner {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 64px;
  }

  .nav {
    order: 3;
    margin-inline-start: 0;
    width: 100%;
  }
  .nav-toggle {
    display: inline-flex;
    margin-inline-start: auto;
  }
  .nav-menu {
    position: absolute;
    inset-block-start: 100%;
    inset-inline: 0;
    background: #fff;
    border-block-end: 1px solid var(--color-line);
    padding: var(--space-2) var(--gutter);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.08);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--duration) var(--ease-out),
                opacity var(--duration) var(--ease-out);
  }
  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-menu a {
    padding-block: 0.75rem;
    border-block-end: 1px solid var(--color-line-soft);
  }
  .nav-menu a:last-child {
    border-block-end: 0;
  }
  .nav-menu a::after {
    display: none;
  }

  .header-inner {
    flex-wrap: wrap;
    row-gap: 0;
  }
  .lang-switch {
    order: 2;
    border-inline-start: 0;
    margin-inline-start: auto;
    padding-inline-start: 0;
  }

  .hero {
    padding-block: var(--space-6) var(--space-5);
  }
}

@media (max-width: 480px) {
  .hero-actions .btn {
    width: 100%;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Print friendliness ---------- */
@media print {
  .site-header,
  .nav,
  .lang-switch,
  .hero-actions,
  .contact-form,
  .site-footer {
    display: none !important;
  }
  body {
    color: #000;
    background: #fff;
  }
  a {
    text-decoration: underline;
  }
}