@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;600&family=Noto+Sans+SC:wght@400;600&display=swap'); /* hm-design-fonts */

/* hm-design-base:start — base rules in design variables only; the rules after this block may refine them. */
body{font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-body);line-height:var(--leading-body);color:hsl(var(--foreground));background-color:hsl(var(--background));-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:var(--weight-heading);line-height:var(--leading-heading);letter-spacing:var(--tracking-heading)}
h1{font-size:var(--text-h1)}h2{font-size:var(--text-h2)}h3{font-size:var(--text-h3)}h4{font-size:var(--text-h4)}h5{font-size:var(--text-base)}h6{font-size:var(--text-sm)}
.display{font-family:var(--font-heading);font-size:var(--text-5xl);font-weight:var(--weight-heading);line-height:var(--leading-heading);letter-spacing:var(--tracking-heading)}
b,strong{font-weight:var(--weight-bold)}
a{color:hsl(var(--link));text-decoration:var(--link-decoration);text-underline-offset:0.18em}
a:hover{text-decoration:var(--link-hover-decoration)}
.container,.container-narrow,.container-wide{box-sizing:border-box;width:100%;margin-inline:auto;padding-inline:var(--container-pad)}
.container{max-width:calc(var(--container-max) + 2 * var(--container-pad))}
.container-narrow{max-width:calc(var(--container-narrow) + 2 * var(--container-pad))}
.container-wide{max-width:calc(var(--container-wide) + 2 * var(--container-pad))}
.section{padding-block:var(--section-y)}
.section-sm{padding-block:var(--section-y-sm)}
.eyebrow{display:inline-block;font-size:var(--eyebrow-size);font-weight:var(--weight-bold);letter-spacing:var(--eyebrow-tracking);text-transform:var(--eyebrow-transform);color:hsl(var(--link))}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:0.5em;padding:var(--btn-pad-y) var(--btn-pad-x);font-family:var(--font-body);font-size:var(--btn-font-size);font-weight:var(--btn-weight);line-height:1.2;letter-spacing:var(--btn-tracking);text-transform:var(--btn-transform);text-decoration:none;border:var(--border-width) solid transparent;border-radius:var(--btn-radius);cursor:pointer;transition:transform var(--duration-fast) var(--ease),box-shadow var(--duration-base) var(--ease),filter var(--duration-fast) var(--ease),background-color var(--duration-base) var(--ease)}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--btn-primary-bg);color:var(--btn-primary-fg)}
.btn-primary:hover{filter:var(--btn-hover-filter);transform:var(--btn-hover-transform);box-shadow:var(--btn-hover-shadow)}
.btn-secondary{background:var(--btn-secondary-bg);color:var(--btn-secondary-fg);border-color:var(--btn-secondary-border)}
.btn-secondary:hover{transform:var(--btn-hover-transform)}
.btn-sm{padding:calc(var(--btn-pad-y) * 0.7) calc(var(--btn-pad-x) * 0.75);font-size:var(--text-sm)}
.btn-lg{padding:calc(var(--btn-pad-y) * 1.25) calc(var(--btn-pad-x) * 1.25);font-size:var(--text-lg)}
.card{background:var(--card-bg);color:hsl(var(--card-foreground));border:var(--card-border);border-radius:var(--card-radius);box-shadow:var(--card-shadow);padding:var(--card-pad);-webkit-backdrop-filter:var(--card-backdrop);backdrop-filter:var(--card-backdrop);transition:transform var(--duration-base) var(--ease),box-shadow var(--duration-base) var(--ease)}
.card:hover{transform:var(--card-hover-transform)}
.input{box-sizing:border-box;width:100%;padding:10px 14px;font:inherit;color:hsl(var(--foreground));background:var(--input-bg);border:var(--input-border);border-bottom:var(--input-border-bottom);border-radius:var(--input-radius)}
.badge{display:inline-flex;align-items:center;gap:0.35em;padding:2px 10px;font-size:var(--text-xs);font-weight:var(--weight-bold);background:var(--badge-bg);color:var(--badge-fg);border:var(--badge-border);border-radius:var(--badge-radius)}
:where(a,button,.btn,.input,input,select,textarea):focus-visible{outline:var(--ring-width) solid hsl(var(--ring));outline-offset:var(--ring-offset)}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important}}
/* hm-design-base:end */

Now I have a clear picture of the design system, the mockup reference, and the brand guidelines. Let me write the structure layer CSS for this corporate energy trading site.

Key characteristics to express:
1. **Corporate & Business style** - Reliable, authoritative, structured
2. **Deep brand surfaces** - Header/hero/footer on `--primary` (#c8102e deep red), not pale/airy
3. **Visible grid rules** - 1px borders, column dividers, structured layout
4. **Cards as bordered panels** - flat, visible 1px border, near-zero radius, not floating tiles
5. **Buttons** - square with arrow icons, solid fill
6. **Typography** - dense, informational, IBM Plex Sans
7. **Motion** - restrained, precise, fade/slide-up reveals, stat counters
8. **Watermark numerals** - faint oversized numbers behind "Who we are" cards
9. **Stats bar** - accent numerals on light background
10. **Hero** - full viewport, media overlay, scrim

Let me craft the CSS now.

/* ============================================
   STRUCTURE LAYER — Beijing Zhonghai QiHuan Technology
   Corporate & Business · Dense · Institutional
   ============================================ */

/* 1. Global class refinements */
.btn {
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  background: currentColor;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='5' y1='12' x2='19' y2='12'%3E%3C/line%3E%3Cpolyline points='12 5 19 12 12 19'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
  mask-size: contain;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='5' y1='12' x2='19' y2='12'%3E%3C/line%3E%3Cpolyline points='12 5 19 12 12 19'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
  -webkit-mask-size: contain;
  transition: transform var(--duration-fast) var(--ease);
}

.btn-primary:hover::after {
  transform: translateX(3px);
}

.card {
  border: var(--border-width) solid hsl(var(--border));
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  transition: transform var(--duration-base) var(--ease), border-color var(--duration-base) var(--ease);
}

.card:hover {
  transform: translateY(var(--hover-lift));
  border-color: hsl(var(--primary) / 0.35);
}

a {
  text-decoration: none;
  color: hsl(var(--link));
  transition: color var(--duration-fast) var(--ease);
}

a:hover {
  text-decoration: underline;
  color: hsl(var(--primary));
}

/* 2. Section surfaces */
.section-muted {
  background: hsl(var(--muted));
  color: hsl(var(--card-foreground));
}

.section-brand {
  background: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
}

.section-brand .eyebrow {
  color: hsl(var(--primary-muted));
}

.section-brand h1,
.section-brand h2,
.section-brand h3,
.section-brand h4 {
  color: hsl(var(--primary-foreground));
}

.section-brand .text-muted {
  color: hsl(var(--primary-muted));
}

.section-gradient {
  background: var(--brand-gradient);
  color: hsl(var(--brand-gradient-foreground));
}

/* 3. Hero helpers */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  overflow: hidden;
  background: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img,
.hero-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--scrim-color);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.hero-content h1,
.hero-content .display {
  color: hsl(var(--primary-foreground));
}

.hero-content p {
  color: hsl(var(--primary-muted));
}

/* 4. Header / Footer wrappers */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: hsl(var(--header));
  color: hsl(var(--header-foreground));
  border-bottom: var(--border-width) solid hsl(var(--header-foreground) / 0.12);
}

.site-header a {
  color: hsl(var(--header-foreground));
  text-decoration: none;
}

.site-header a:hover,
.site-header a.is-active {
  color: hsl(var(--header-muted));
}

.site-header.scrolled {
  background: hsl(var(--header));
  color: hsl(var(--header-foreground));
}

.site-footer {
  background: hsl(var(--footer));
  color: hsl(var(--footer-foreground));
  border-top: var(--border-width) solid hsl(var(--footer-foreground) / 0.1);
}

.site-footer a {
  color: hsl(var(--footer-foreground));
  text-decoration: none;
}

.site-footer a:hover {
  color: hsl(var(--footer-muted));
  text-decoration: underline;
}

.site-footer .footer-muted {
  color: hsl(var(--footer-muted));
}

/* 5. Style signatures & utilities */
.eyebrow {
  display: block;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: hsl(var(--link));
}

.text-muted {
  color: hsl(var(--muted-foreground));
}

.text-link {
  color: hsl(var(--link));
  font-weight: var(--weight-bold);
}

.text-link::after {
  content: " →";
  display: inline;
  transition: transform var(--duration-fast) var(--ease);
}

.text-link:hover::after {
  content: " →";
}

.grid-auto {
  display: grid;
  gap: var(--grid-gap);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stack-sm {
  gap: var(--space-2);
}

.stack-lg {
  gap: var(--space-6);
}

/* Grid lines / visible column dividers */
.grid-rules {
  position: relative;
}

.grid-rules::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, hsl(var(--border)) 1px, transparent 1px);
  background-size: calc(100% / 12) 100%;
  opacity: 0.4;
}

/* Bordered panels / ledger cards */
.panel {
  border: var(--border-width) solid hsl(var(--border));
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  padding: var(--space-6);
}

/* Data table styling */
.data-table {
  width: 100%;
  border-collapse: collapse;
  border: var(--border-width) solid hsl(var(--border));
}

.data-table th,
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-width) solid hsl(var(--border));
  text-align: left;
}

.data-table th {
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  font-weight: var(--weight-bold);
  border-bottom-width: calc(var(--border-width) * 2);
}

.data-table tr:nth-child(even) {
  background: hsl(var(--muted));
}

.data-table tr:hover {
  background: hsl(var(--primary) / 0.04);
}

/* Stats bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
  padding-block: var(--section-y);
}

@media (min-width: 768px) {
  .stats-bar {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-item {
  border-left: var(--border-width) solid hsl(var(--border));
  padding-left: var(--space-4);
}

.stat-number {
  font-size: var(--text-h2);
  font-weight: var(--weight-bold);
  line-height: var(--leading-heading);
  color: hsl(var(--accent));
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: var(--text-sm);
  color: hsl(var(--muted-foreground));
  margin-top: var(--space-1);
}

/* Watermark numerals for card grids */
.watermark-grid {
  position: relative;
}

.watermark-num {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  font-size: clamp(6rem, 12vw, 10rem);
  font-weight: var(--weight-bold);
  line-height: 1;
  color: hsl(var(--primary) / 0.06);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

/* Scroll reveal animations */
.reveal {
  transition: opacity var(--duration-slow) var(--ease), transform var(--duration-slow) var(--ease);
  animation:hm-reveal-kfy54r var(--duration-base, 0.5s) var(--ease, ease) both;
}
@keyframes hm-reveal-kfy54r{
from{opacity:0;transform:translateY(16px)}}
@media (prefers-reduced-motion: reduce){
.reveal{animation:none}}

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

/* Stagger children */
.stagger > * {
  transition: opacity var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
  animation:hm-reveal-1t55ecn var(--duration-base, 0.5s) var(--ease, ease) both;
}
@keyframes hm-reveal-1t55ecn{
from{opacity:0;transform:translateY(12px)}}
@media (prefers-reduced-motion: reduce){
.stagger > *{animation:none}}

.stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger.is-visible > *:nth-child(2) { transition-delay: 80ms; }
.stagger.is-visible > *:nth-child(3) { transition-delay: 160ms; }
.stagger.is-visible > *:nth-child(4) { transition-delay: 240ms; }
.stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Logo strip */
.logo-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding-block: var(--space-6);
  border-top: var(--border-width) solid hsl(var(--border));
  border-bottom: var(--border-width) solid hsl(var(--border));
}

.logo-strip img {
  max-height: 32px;
  opacity: 0.5;
  filter: grayscale(100%);
  transition: opacity var(--duration-fast) var(--ease);
}

.logo-strip img:hover {
  opacity: 0.8;
}

/* Quote / testimonial */
.quote-block {
  position: relative;
  padding: var(--space-8) var(--space-6);
  border-left: 3px solid hsl(var(--accent));
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
}

.quote-block blockquote {
  font-size: var(--text-h4);
  line-height: var(--leading-heading);
  color: hsl(var(--foreground));
  margin: 0;
}

.quote-block cite {
  display: block;
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  font-style: normal;
  color: hsl(var(--muted-foreground));
}

/* Responsive */
@media (min-width: 768px) {
  .grid-auto {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-auto {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid-auto-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.prose {
  --tw-prose-body: hsl(var(--text));
  --tw-prose-headings: hsl(var(--text));
  --tw-prose-lead: #4b5563;
  --tw-prose-links: #111827;
  --tw-prose-bold: #111827;
  --tw-prose-counters: #6b7280;
  --tw-prose-bullets: #d1d5db;
  --tw-prose-hr: #e5e7eb;
  --tw-prose-quotes: #111827;
  --tw-prose-quote-borders: #e5e7eb;
  --tw-prose-captions: #6b7280;
  --tw-prose-kbd: #111827;
  --tw-prose-kbd-shadows: rgb(17 24 39/10%);
  --tw-prose-code: #111827;
  --tw-prose-pre-code: #e5e7eb;
  --tw-prose-pre-bg: #1f2937;
  --tw-prose-th-borders: #d1d5db;
  --tw-prose-td-borders: #e5e7eb;
  --tw-prose-invert-body: #d1d5db;
  --tw-prose-invert-headings: #fff;
  --tw-prose-invert-lead: #9ca3af;
  --tw-prose-invert-links: #fff;
  --tw-prose-invert-bold: #fff;
  --tw-prose-invert-counters: #9ca3af;
  --tw-prose-invert-bullets: #4b5563;
  --tw-prose-invert-hr: #374151;
  --tw-prose-invert-quotes: #f3f4f6;
  --tw-prose-invert-quote-borders: #374151;
  --tw-prose-invert-captions: #9ca3af;
  --tw-prose-invert-kbd: #fff;
  --tw-prose-invert-kbd-shadows: rgb(255 255 255/10%);
  --tw-prose-invert-code: #fff;
  --tw-prose-invert-pre-code: #d1d5db;
  --tw-prose-invert-pre-bg: rgb(0 0 0/50%);
  --tw-prose-invert-th-borders: #4b5563;
  --tw-prose-invert-td-borders: #374151;
  font-size: 1rem;
  line-height: 1.75;
}
.posts-archive-grid img {
  aspect-ratio: 16/9;
}

/* hm-design-shape:start — corner shapes come from the Site Design settings; this block follows the structure layer so they always take effect. */
.btn{border-radius:var(--btn-radius)}
.card{border-radius:var(--card-radius)}
.input{border-radius:var(--input-radius)}
.badge{border-radius:var(--badge-radius)}
/* hm-design-shape:end */

/* hm-design-tokens:start — rendered from the Site Design config. Change values on the Site Design page; values edited here are read back into the config on save. */
:root {
  --background: 0 0% 99.2%;
  --foreground: 180 1% 20.2%;
  --text: 180 1% 20.2%;
  --card: 0 0% 95.7%;
  --card-foreground: 180 1% 20.2%;
  --popover: 0 0% 95.7%;
  --popover-foreground: 180 1% 20.2%;
  --primary: 350.2 85.2% 42.4%;
  --primary-foreground: 0 0% 100%;
  --primary-muted: 350.4 64.1% 92.4%;
  --primary-highlight: 180 1.5% 73.7%;
  --secondary: 359.5 58% 39.2%;
  --secondary-foreground: 0 0% 100%;
  --muted: 0 0% 95.7%;
  --muted-foreground: 150 1% 39.2%;
  --accent: 350.2 85.2% 42.4%;
  --accent-foreground: 0 0% 100%;
  --destructive: 0 72.2% 50.6%;
  --destructive-foreground: 0 0% 100%;
  --border: 0 0% 88.2%;
  --input: 0 0% 85.1%;
  --ring: 350.2 85.2% 42.4%;
  --success: 141 78.9% 85.1%;
  --success-foreground: 220.9 39.3% 11%;
  --warning: 48 96.6% 76.7%;
  --warning-foreground: 220.9 39.3% 11%;
  --error: 0 96.3% 89.4%;
  --error-foreground: 220.9 39.3% 11%;
  --header: 350.2 85.2% 42.4%;
  --header-foreground: 216 9.8% 90%;
  --header-muted: 345 34.8% 91%;
  --footer: 350.2 85.2% 42.4%;
  --footer-foreground: 216 9.8% 90%;
  --footer-muted: 345 34.8% 91%;
  --link: 350.2 85.2% 42.4%;
  --headline: 180 1.8% 10.8%;
  --brand-gradient: linear-gradient(135deg, #c8102e 0%, #c8102e 100%);
  --brand-gradient-foreground: #ffffff;
  --font-heading: 'IBM Plex Sans', 'Noto Sans SC', sans-serif;
  --font-body: 'IBM Plex Sans', 'Noto Sans SC', sans-serif;
  --text-xs: 13.89px;
  --text-sm: 16.67px;
  --text-base: 20px;
  --text-lg: 24px;
  --text-xl: clamp(22.46px, 20.23px + 0.595vw, 28.8px);
  --text-2xl: clamp(26.96px, 24.28px + 0.714vw, 34.56px);
  --text-3xl: clamp(25.71px, 20.16px + 1.48vw, 41.47px);
  --text-4xl: clamp(30.86px, 24.2px + 1.776vw, 49.77px);
  --text-5xl: clamp(37.03px, 29.04px + 2.131vw, 59.72px);
  --text-h1: clamp(71.92px, 56.4px + 4.139vw, 116px);
  --text-h2: clamp(51.46px, 40.35px + 2.962vw, 83px);
  --text-h3: clamp(40.92px, 32.09px + 2.355vw, 66px);
  --text-h4: var(--text-lg);
  --weight-heading: 400;
  --weight-body: 400;
  --weight-bold: 600;
  --leading-heading: 1.15;
  --leading-body: 1.55;
  --tracking-heading: 0em;
  --eyebrow-size: 11px;
  --eyebrow-tracking: 0.06em;
  --eyebrow-transform: uppercase;
  --link-decoration: none;
  --link-hover-decoration: underline;
  --container-max: 1290px;
  --container-narrow: 720px;
  --container-wide: 1440px;
  --container-pad: 20px;
  --section-y: clamp(64px, 55.55px + 2.254vw, 88px);
  --section-y-sm: calc(var(--section-y) * 0.5);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-7: 56px;
  --space-8: 64px;
  --space-9: 72px;
  --space-10: 80px;
  --space-11: 88px;
  --space-12: 96px;
  --grid-gap: 32px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-pill: 9999px;
  --radius: 4px;
  --radius-image: 0px;
  --border-width: 1px;
  --shadow-lg: none;
  --shadow-md: none;
  --shadow-sm: none;
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --hover-lift: -2px;
  --scrim: 0.6;
  --scrim-color: rgba(0, 0, 0, 0.6);
  --ring-width: 2px;
  --ring-offset: 2px;
  --btn-radius: 0px;
  --btn-pad-y: 12px;
  --btn-pad-x: 22px;
  --btn-font-size: var(--text-base);
  --btn-weight: 600;
  --btn-transform: none;
  --btn-tracking: 0;
  --btn-primary-bg: hsl(var(--primary));
  --btn-primary-fg: hsl(var(--primary-foreground));
  --btn-secondary-bg: transparent;
  --btn-secondary-fg: hsl(var(--foreground));
  --btn-secondary-border: hsl(var(--foreground) / 0.35);
  --btn-hover-filter: brightness(0.92);
  --btn-hover-transform: none;
  --btn-hover-shadow: none;
  --card-radius: var(--radius-sm);
  --card-pad: 24px;
  --card-bg: hsl(var(--card));
  --card-border: var(--border-width) solid transparent;
  --card-shadow: none;
  --card-backdrop: none;
  --card-hover-transform: none;
  --input-radius: var(--radius-sm);
  --input-bg: hsl(var(--background));
  --input-border: var(--border-width) solid hsl(var(--input));
  --input-border-bottom: var(--border-width) solid hsl(var(--input));
  --badge-radius: 0px;
  --badge-bg: transparent;
  --badge-fg: hsl(var(--foreground));
  --badge-border: var(--border-width) solid hsl(var(--border));
  --header-h: 72px;
  --header-shadow-scrolled: var(--shadow-md);
}
@media (min-width: 768px) {
  :root {
    --container-pad: 32px;
  }
}
/* hm-design-tokens:end */