/* ============================================================
   SIRONG 斯荣 — Editorial Trade House
   Design tokens · layout · components · motion
   ============================================================ */

:root {
  /* palette — warm paper, deep ink, vermilion seal */
  --paper: #f7f2e8;
  --paper-2: #efe7d6;
  --ink: #221b12;
  --ink-2: rgba(34, 27, 18, 0.72);
  --ink-3: rgba(34, 27, 18, 0.52);
  --hairline: rgba(34, 27, 18, 0.16);
  --accent: #b23a1d;
  --accent-deep: #8f2c13;
  --dark: #1d1710;
  --dark-2: #2a2117;
  --paper-on-dark: #f2ead9;

  /* type */
  --font-display: "Fraunces", Georgia, "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: "Manrope", -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;

  /* spacing (4pt base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --dur-fast: 150ms;
  --dur-med: 300ms;
  --dur-slow: 700ms;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--accent); color: var(--paper); }

.wrap {
  max-width: 76rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

/* ---------- shared type ---------- */
.kicker {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.kicker::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: var(--accent);
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 400; line-height: 1.12; }

h2 {
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  letter-spacing: -0.01em;
  margin-top: var(--space-4);
}

.section { padding-block: clamp(4.5rem, 9vw, 7.5rem); }
.section-head { max-width: 44rem; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-sub {
  margin-top: var(--space-4);
  font-size: 1.0625rem;
  color: var(--ink-2);
  max-width: 38rem;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.75rem;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid transparent;
  transition: transform var(--dur-med) var(--ease-out-quart),
              background var(--dur-fast) ease,
              border-color var(--dur-fast) ease;
}
.btn-primary { background: var(--accent); color: var(--paper); }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-2px); }
.btn-ghost { border-color: var(--hairline); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-2px); }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
}
.text-link i { font-style: normal; transition: transform var(--dur-med) var(--ease-out-quart); }
.text-link:hover i { transform: translateX(4px); }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-med) ease;
}
.site-header.is-scrolled { border-bottom-color: var(--hairline); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: 4.5rem;
}

.brand { display: inline-flex; align-items: center; gap: var(--space-3); text-decoration: none; color: var(--ink); }
.brand-logo {
  height: 2.6rem;
  width: auto;
  flex-shrink: 0;
  transition: transform var(--dur-med) var(--ease-out-quart);
  display: block;
}
.brand:hover .brand-logo { transform: translateX(2px) translateY(-1px); }
.brand-logo--lg { height: 3.5rem; }
.brand-word { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-family: var(--font-display); font-size: 1.125rem; letter-spacing: 0.14em; }
.brand-sub { font-size: 0.6875rem; color: var(--ink-3); letter-spacing: 0.1em; }

.main-nav { display: flex; gap: var(--space-8); }
.main-nav a {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  padding-block: var(--space-2);
  position: relative;
  transition: color var(--dur-fast) ease;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transition: right var(--dur-med) var(--ease-out-quart);
}
.main-nav a:hover { color: var(--ink); }
.main-nav a:hover::after { right: 0; }

.header-side { display: flex; align-items: center; gap: var(--space-4); }

.lang-switch {
  display: flex;
  border: 1px solid var(--hairline);
  padding: 2px;
}
.lang-switch button {
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--ink-3);
  transition: background var(--dur-fast) ease, color var(--dur-fast) ease;
}
.lang-switch button.is-active { background: var(--ink); color: var(--paper); }
.lang-switch button:not(.is-active):hover { color: var(--ink); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: var(--space-2); }
.menu-toggle span { width: 22px; height: 2px; background: var(--ink); transition: transform var(--dur-med) var(--ease-out-quart); }

/* ============================================================
   Hero
   ============================================================ */
.hero { padding-top: clamp(3rem, 7vw, 5.5rem); padding-bottom: clamp(3rem, 6vw, 5rem); }

.hero-title {
  font-size: clamp(2.75rem, 7.2vw, 5.75rem);
  letter-spacing: -0.015em;
  margin-top: var(--space-6);
  max-width: 16ch;
}
.hero-title span { display: block; }
.hero-title em { font-style: italic; color: var(--accent); }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: end;
  margin-top: clamp(2.5rem, 5vw, 4rem);
}

.hero-lead p { font-size: 1.0625rem; color: var(--ink-2); max-width: 34rem; }

.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--hairline);
}
.hero-badges li {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.hero-badges li::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--accent);
}

.hero-figure { position: relative; }
.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--hairline);
}
.hero-figure figcaption {
  display: flex;
  justify-content: space-between;
  padding-top: var(--space-3);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.hero-figure figcaption::after { content: "— SIRONG"; }

/* ============================================================
   Ticker
   ============================================================ */
.ticker {
  background: var(--accent);
  color: var(--paper);
  overflow: hidden;
  padding-block: 0.85rem;
}
.ticker-track {
  display: flex;
  gap: var(--space-12);
  width: max-content;
  animation: marquee 36s linear infinite;
}
.ticker-track span {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-12);
}
.ticker-track span::after { content: "·"; font-size: 1.25rem; line-height: 0; }
@keyframes marquee {
  to { transform: translateX(-50%); }
}

/* ============================================================
   Stats
   ============================================================ */
.stats { border-bottom: 1px solid var(--hairline); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: clamp(1.75rem, 3vw, 2.75rem) clamp(1rem, 2vw, 2rem);
  border-left: 1px solid var(--hairline);
}
.stat:first-child { border-left: 0; padding-left: 0; }
.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.6vw, 3rem);
  font-weight: 300;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.stat span {
  display: block;
  margin-top: var(--space-3);
  font-size: 0.8125rem;
  color: var(--ink-2);
  max-width: 20ch;
}

/* ============================================================
   Two lines of business
   ============================================================ */
.lines-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}
.line-card {
  border: 1px solid var(--hairline);
  background: var(--paper);
  display: flex;
  flex-direction: column;
  transition: border-color var(--dur-med) ease;
}
.line-card:hover { border-color: var(--ink); }
.line-media { overflow: hidden; }
.line-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 900ms var(--ease-out-expo);
}
.line-card:hover .line-media img { transform: scale(1.04); }
.line-body { padding: clamp(1.5rem, 3vw, 2.25rem); display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-3); flex: 1; }
.line-tag {
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.3rem 0.65rem;
}
.line-body h3 { font-size: clamp(1.35rem, 2vw, 1.65rem); margin-top: var(--space-2); }
.line-body p { color: var(--ink-2); font-size: 0.9375rem; flex: 1; }
.line-body .text-link { margin-top: var(--space-3); }

/* ============================================================
   Services grid
   ============================================================ */
.services { background: var(--paper-2); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}
.service {
  padding: clamp(1.75rem, 3vw, 2.5rem);
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  transition: background var(--dur-med) ease;
}
.service:hover { background: var(--paper); }
.service-no {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-style: italic;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.service h3 { font-size: 1.25rem; margin-top: var(--space-4); }
.service p { margin-top: var(--space-3); font-size: 0.9rem; color: var(--ink-2); }

.wide-figure { margin-top: clamp(2.5rem, 5vw, 4rem); }
.wide-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border: 1px solid var(--hairline);
}

/* ============================================================
   Process
   ============================================================ */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  counter-reset: step;
}
.process-grid li {
  border-top: 2px solid var(--ink);
  padding-top: var(--space-6);
  position: relative;
}
.process-no {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.process-grid h3 { font-size: 1.1875rem; margin-top: var(--space-4); }
.process-grid p { margin-top: var(--space-3); font-size: 0.9rem; color: var(--ink-2); }

/* ============================================================
   Compliance — dark section
   ============================================================ */
.compliance {
  background: var(--dark);
  color: var(--paper-on-dark);
}
.compliance .kicker { color: #e2846d; }
.compliance .kicker::before { background: #e2846d; }
.compliance .section-sub { color: rgba(242, 234, 217, 0.66); }
.compliance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 3.5rem) clamp(2rem, 5vw, 4.5rem);
}
.comp-item {
  border-top: 1px solid rgba(242, 234, 217, 0.2);
  padding-top: var(--space-6);
}
.comp-item h3 { font-size: 1.375rem; color: var(--paper-on-dark); }
.comp-item h3::before {
  content: "";
  display: inline-block;
  width: 0.55em; height: 0.55em;
  background: var(--accent);
  margin-right: 0.6em;
  vertical-align: baseline;
}
.comp-item p { margin-top: var(--space-3); font-size: 0.9375rem; color: rgba(242, 234, 217, 0.66); }

/* ============================================================
   Banks
   ============================================================ */
.banks-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-6);
  border-block: 1px solid var(--hairline);
  padding-block: clamp(2rem, 4vw, 3rem);
}
.bank {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  transition: color var(--dur-med) ease;
}
.bank:hover { color: var(--accent); }

/* ============================================================
   Contact
   ============================================================ */
.contact { background: var(--paper-2); }
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: start;
}

.contact-list { margin-top: clamp(2rem, 4vw, 3rem); }
.contact-list > div {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-top: 1px solid var(--hairline);
}
.contact-list > div:last-child { border-bottom: 1px solid var(--hairline); }
.contact-list dt {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 0.35em;
}
.contact-list dd { font-family: var(--font-display); font-size: clamp(1.15rem, 2vw, 1.5rem); line-height: 1.3; }
.contact-list dd a {
  border-bottom: 1px solid var(--hairline);
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease;
}
.contact-list dd a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.contact-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--hairline);
}
.req-card {
  margin-top: var(--space-6);
  border: 1px solid var(--hairline);
  background: var(--paper);
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
}
.req-card h3 {
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: var(--space-4);
}
.req-card table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.req-card th, .req-card td {
  text-align: left;
  padding-block: var(--space-2);
  border-top: 1px solid var(--hairline);
  font-size: 0.9375rem;
}
.req-card th { font-weight: 600; color: var(--ink-3); width: 5rem; }
.req-card td { font-family: var(--font-display); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--dark);
  color: rgba(242, 234, 217, 0.72);
  padding-block: var(--space-12);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.footer-brand { display: flex; gap: var(--space-4); align-items: center; }
.footer-brand strong { font-family: var(--font-display); font-weight: 400; letter-spacing: 0.06em; color: var(--paper-on-dark); }
.footer-brand p { font-size: 0.8125rem; margin-top: var(--space-1); }
.footer-legal { font-size: 0.8125rem; text-align: right; }
.footer-legal p + p { margin-top: var(--space-1); }

/* ============================================================
   Reveal motion
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur-slow) var(--ease-out-expo),
              transform var(--dur-slow) var(--ease-out-expo);
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 90ms; }
.reveal.d2 { transition-delay: 180ms; }
.reveal.d3 { transition-delay: 270ms; }
.reveal.d4 { transition-delay: 360ms; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .ticker-track { animation: none; flex-wrap: wrap; width: auto; }
  .line-media img { transition: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 64rem) {
  .main-nav {
    position: fixed;
    inset: 4.5rem 0 auto 0;
    background: var(--paper);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) clamp(1.25rem, 4vw, 2.5rem) var(--space-4);
    transform: translateY(-110%);
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--dur-med) var(--ease-out-quart),
                visibility var(--dur-med) ease;
    z-index: 40;
  }
  .main-nav.is-open { transform: translateY(0); visibility: visible; pointer-events: auto; }
  .main-nav a { padding-block: var(--space-3); border-top: 1px solid var(--hairline); }
  .menu-toggle { display: flex; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

  .hero-grid { grid-template-columns: 1fr; align-items: start; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-left: 0; padding-left: 0; }
  .stat { border-top: 1px solid var(--hairline); }
  .stat:nth-child(-n+2) { border-top: 0; }
  .lines-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr 1fr; }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-legal { text-align: left; }
}

@media (max-width: 40rem) {
  .brand-sub { display: none; }
  .services-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .compliance-grid { grid-template-columns: 1fr; }
  .contact-list > div { grid-template-columns: 1fr; gap: var(--space-1); }
  .contact-list dt { padding-top: 0; }
  .hero-cta .btn { flex: 1 1 auto; }
}