/* ============================================================
   Elkington China Ltd — design system
   Industrial-precision theme: warm paper, graphite ink,
   Elkington red accent (#c9271f for text, #ea3931 for marks)
   ============================================================ */

:root {
  --font-display: 'Cabinet Grotesk', 'Arial Narrow', sans-serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;

  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Surfaces — warm paper */
  --color-bg: #f6f4f1;
  --color-surface: #faf9f7;
  --color-surface-2: #fdfcfa;
  --color-surface-offset: #efedea;
  --color-surface-offset-2: #e7e4df;
  --color-divider: #ddd9d3;
  --color-border: #d3cfc8;

  /* Ink */
  --color-text: #212224;
  --color-text-muted: #5c5e62;
  --color-text-faint: #9a9ca1;
  --color-text-inverse: #f8f6f3;

  /* Accent — Elkington red */
  --color-primary: #c9271f;
  --color-primary-hover: #a91e18;
  --color-primary-active: #8c1712;
  --color-primary-bright: #ea3931;
  --color-primary-highlight: #f5dedc;

  /* Secondary — steel */
  --color-steel: #4a5159;
  --color-steel-light: #6b7279;

  /* Dark surfaces */
  --color-dark: #232527;
  --color-dark-2: #1b1d1f;
  --color-dark-border: #3a3d40;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px rgba(33, 34, 36, 0.07);
  --shadow-md: 0 4px 14px rgba(33, 34, 36, 0.09);
  --shadow-lg: 0 16px 40px rgba(33, 34, 36, 0.14);

  --content-default: 1100px;
  --content-wide: 1240px;
  --content-narrow: 720px;

  --header-h: 76px;
}

/* ============ Layout helpers ============ */

.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container-wide {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: clamp(var(--space-12), 7vw, var(--space-24));
}

.section--tight {
  padding-block: clamp(var(--space-8), 5vw, var(--space-16));
}

.section--dark {
  background: var(--color-dark);
  color: var(--color-text-inverse);
}

.section--dark h2,
.section--dark h3 {
  color: #fff;
}

.section--dark p {
  color: #c9cbce;
}

/* ============ Typography ============ */

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.h-xl {
  font-size: var(--text-2xl);
  line-height: 1.05;
}

.h-lg {
  font-size: var(--text-xl);
}

.h-md {
  font-size: var(--text-lg);
  font-weight: 700;
}

.kicker {
  font-family: ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, monospace;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  font-weight: 600;
}

.section--dark .kicker {
  color: var(--color-primary-bright);
}

.lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 400;
  max-width: 60ch;
}

/* ============ Header ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 244, 241, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.site-header__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo {
  height: 46px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.site-nav a:hover {
  color: var(--color-primary);
}

.site-nav a[aria-current='page'] {
  color: var(--color-primary);
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  letter-spacing: 0.01em;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

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

.btn--ghost {
  border: 1px solid oklch(from var(--color-text) l c h / 0.25);
  color: inherit;
}

.btn--ghost:hover {
  border-color: currentColor;
}

.site-nav a.btn--primary,
.site-nav a.btn--primary:hover {
  color: #fff;
}

/* Mobile nav */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-2) var(--space-6) var(--space-4);
    display: none;
  }
  .site-nav.open {
    display: flex;
  }
  .site-nav a {
    padding: var(--space-3) 0;
    min-height: 44px;
  }
  .site-nav .btn {
    margin-top: var(--space-2);
  }
}

/* ============ Hero ============ */

.hero {
  position: relative;
  background: var(--color-dark-2);
  color: #fff;
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.82;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(20, 21, 23, 0.9) 0%,
    rgba(20, 21, 23, 0.62) 55%,
    rgba(20, 21, 23, 0.42) 100%
  );
}

.hero__content {
  position: relative;
  padding-block: clamp(var(--space-24), 18vw, var(--space-32)) var(--space-16);
  max-width: 780px;
}

.hero__content .kicker {
  color: #fff;
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.85),
    0 2px 10px rgba(0, 0, 0, 0.55);
}

.hero__content h1,
.page-hero h1 {
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.page-hero .kicker {
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.65);
}

.hero h1 {
  font-size: var(--text-2xl);
  color: #fff;
  margin-block: var(--space-4) var(--space-5);
  max-width: 18ch;
}

.hero p {
  font-size: var(--text-lg);
  color: #d6d8da;
  max-width: 56ch;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.hero__actions .btn--ghost {
  color: #fff;
}

/* Page hero (interior pages) */
.page-hero {
  position: relative;
  background: var(--color-dark-2);
  color: #fff;
  overflow: hidden;
}

.page-hero__media {
  position: absolute;
  inset: 0;
}

.page-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.page-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(20, 21, 23, 0.92) 0%,
    rgba(20, 21, 23, 0.55) 70%,
    rgba(20, 21, 23, 0.35) 100%
  );
}

.page-hero__content {
  position: relative;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
  max-width: 720px;
}

.page-hero h1 {
  font-size: var(--text-xl);
  color: #fff;
  margin-block: var(--space-3) var(--space-4);
}

.page-hero p {
  color: #c9cbce;
  font-size: var(--text-base);
}

/* ============ Cards / grids ============ */

.media-caption {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.range-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: var(--space-6);
}

.range-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
}

.range-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.range-card__media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-surface-offset-2);
}

.range-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.range-card__body {
  padding: var(--space-5) var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
}

.range-card h3 {
  font-size: var(--text-lg);
  font-weight: 700;
}

.range-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.range-card--feature {
  grid-column: span 2;
}

.range-card--feature .range-card__media {
  aspect-ratio: 21 / 9;
}

@media (max-width: 720px) {
  .range-card--feature {
    grid-column: span 1;
  }
}

/* Split feature rows */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 4vw, var(--space-16));
  align-items: center;
}

.split + .split {
  margin-top: clamp(var(--space-12), 6vw, var(--space-20));
}

.split--flip .split__media {
  order: 2;
}

.split__media {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.split__media img {
  width: 100%;
  object-fit: cover;
}

.split__media--tall img {
  aspect-ratio: 4 / 5;
}

.split__body h3 {
  font-size: var(--text-xl);
  margin-block: var(--space-3) var(--space-4);
}

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

.split__body p + p {
  margin-top: var(--space-3);
}

@media (max-width: 860px) {
  .split {
    grid-template-columns: 1fr;
  }
  .split--flip .split__media {
    order: 0;
  }
}

/* ============ Load class table ============ */

.load-table {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.load-table table {
  min-width: 560px;
}

.table-hint {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

@media (max-width: 719px) {
  .table-hint {
    display: block;
  }
}

.load-table table {
  font-size: var(--text-sm);
}

.load-table th,
.load-table td {
  text-align: left;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  vertical-align: top;
}

.load-table thead th {
  background: var(--color-dark);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.load-table tbody tr:last-child td {
  border-bottom: none;
}

.load-table tbody tr:hover {
  background: var(--color-surface-2);
}

.class-chip {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  letter-spacing: 0.02em;
}

.load-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-3);
}

/* ============ Feature list ============ */

.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6) clamp(var(--space-8), 4vw, var(--space-16));
}

.feature-list li {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  color: var(--color-text-muted);
}

.section--dark .feature-list li {
  color: #c9cbce;
}

.section--dark .feature-list strong {
  color: #fff;
}

.feature-list li::before {
  content: '';
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 1px;
  background: var(--color-primary-bright);
  transform: translateY(-1px);
}

.feature-list strong {
  color: var(--color-text);
  font-weight: 600;
}

@media (max-width: 720px) {
  .feature-list {
    grid-template-columns: 1fr;
  }
}

/* ============ Projects ============ */

.project-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-8);
}

.project-cols h3 {
  font-size: var(--text-sm);
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-bright);
  margin-bottom: var(--space-4);
  font-weight: 600;
}

.project-cols ul {
  list-style: none;
}

.project-cols li {
  font-size: var(--text-sm);
  color: #c9cbce;
  padding-block: var(--space-1);
  border-bottom: 1px solid var(--color-dark-border);
}

.project-cols li:last-child {
  border-bottom: none;
}

/* ============ Stats band ============ */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-8);
}

.stat-row .stat {
  border-top: 2px solid var(--color-primary-bright);
  padding-top: var(--space-4);
}

.stat-row .stat b {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: #fff;
  line-height: 1.1;
}

.stat-row .stat span {
  font-size: var(--text-sm);
  color: #c9cbce;
}

/* ============ CTA band ============ */

.cta-band {
  background: var(--color-dark);
  color: #fff;
}

.cta-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.cta-band h2 {
  font-size: var(--text-xl);
  color: #fff;
  max-width: 22ch;
}

.cta-band p {
  color: #c9cbce;
  margin-top: var(--space-3);
  max-width: 52ch;
}

/* ============ Contact ============ */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.contact-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.contact-card h3 {
  font-size: var(--text-lg);
}

.contact-card .role {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--space-1);
}

.contact-card dl {
  margin-top: var(--space-5);
  display: grid;
  gap: var(--space-3);
}

.contact-card dt {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
}

.contact-card dd {
  font-size: var(--text-sm);
  font-weight: 500;
}

.contact-card a {
  color: inherit;
  text-decoration-color: var(--color-primary-bright);
  text-underline-offset: 3px;
}

.contact-card a:hover {
  color: var(--color-primary);
}

/* ============ Footer ============ */

.site-footer {
  background: var(--color-dark-2);
  color: #b9bbbe;
  font-size: var(--text-sm);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: var(--space-10);
  padding-block: var(--space-16) var(--space-10);
}

.site-footer h3 {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #8e9094;
  margin-bottom: var(--space-4);
  font-weight: 600;
}

.site-footer ul {
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.site-footer a {
  color: #d6d8da;
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-primary-bright);
}

.footer-brand b {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  color: #fff;
  letter-spacing: 0.02em;
  font-style: italic;
}

.footer-brand .china {
  color: var(--color-primary-bright);
  font-style: italic;
}

.footer-brand .cn-name {
  margin-top: var(--space-2);
  color: #d6d8da;
}

.footer-brand p {
  margin-top: var(--space-4);
  max-width: 34ch;
  color: #9a9ca1;
  font-size: var(--text-sm);
}

.footer-bottom {
  border-top: 1px solid var(--color-dark-border);
  padding-block: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  font-size: var(--text-xs);
  color: #8e9094;
  max-width: none;
}

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

@media (max-width: 560px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* ============ Misc ============ */

.section-head {
  max-width: 640px;
  margin-bottom: clamp(var(--space-8), 5vw, var(--space-12));
}

.section-head h2 {
  font-size: var(--text-xl);
  margin-block: var(--space-3) var(--space-4);
}

.section-head p {
  color: var(--color-text-muted);
}

.spec-tag {
  display: inline-block;
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
}

.note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-6);
}

/* Load-in animation (CSS only — runs on page load, content never hidden) */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.reveal {
  animation: fade-up 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

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