:root {
  /* Portfolio case standard v1.0 — shared desktop foundation */
  --portfolio-content-width: min(1280px, calc(100vw - 240px));
  --portfolio-rail-width: 85px;
  --portfolio-edge: 18px;
  --portfolio-h1-size: 64px;
  --portfolio-h2-size: 44px;
  --portfolio-h3-size: 28px;
  --portfolio-lead-size: 20px;
  --portfolio-body-size: 16px;
  --portfolio-small-size: 14px;
  --portfolio-meta-size: 12px;
  --portfolio-section-gap: 120px;
}

html { scroll-padding-top: 32px; }

body.portfolio-case {
  font-size: var(--portfolio-body-size);
  line-height: 1.7;
}

body.portfolio-case h1 {
  font-size: var(--portfolio-h1-size);
  font-weight: 780;
  line-height: 1.1;
}

body.portfolio-case h2 {
  font-size: var(--portfolio-h2-size);
  font-weight: 740;
  line-height: 1.2;
}

body.portfolio-case h3 {
  font-size: var(--portfolio-h3-size);
  line-height: 1.3;
}

.portfolio-case .portfolio-lead {
  font-size: var(--portfolio-lead-size);
  line-height: 1.6;
}

.portfolio-case .portfolio-small { font-size: var(--portfolio-small-size); }
.portfolio-case .portfolio-meta { font-size: var(--portfolio-meta-size); }

.portfolio-case main [id] { scroll-margin-top: 32px; }

.portfolio-case .wrap,
.portfolio-case .shell,
.portfolio-case--jingzhang .hero-inner,
.portfolio-case--jingzhang .why-this {
  width: var(--portfolio-content-width);
  max-width: none;
  margin-inline: auto;
}

.portfolio-case--jingzhang .hero { padding-inline: 0; }

.portfolio-skip {
  position: fixed;
  top: 10px;
  left: -999px;
  z-index: 120;
  padding: 8px 12px;
  border-radius: 3px;
  background: var(--portfolio-focus, #0055ff);
  color: var(--portfolio-focus-text, #fff);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.portfolio-skip:focus { left: 12px; }

.portfolio-mark {
  position: fixed;
  top: 24px;
  left: 32px;
  z-index: 90;
  color: var(--portfolio-brand, currentColor);
}

.portfolio-mark__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  color: inherit;
  font-size: 13px;
  text-decoration: none;
}

.portfolio-mark__brand span {
  color: var(--portfolio-brand-accent, currentColor);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .08em;
}

.portfolio-mark__brand strong { font-weight: 760; }

.portfolio-case .arch-index {
  right: var(--portfolio-edge);
  width: var(--portfolio-rail-width);
  gap: 6px;
}

.portfolio-case .arch-index a {
  box-sizing: border-box;
  width: var(--portfolio-rail-width);
  min-height: 44px;
  padding: 0 6px;
  line-height: 1.1;
  white-space: nowrap;
  overflow: visible;
  text-overflow: clip;
}

.portfolio-case .arch-index a i {
  width: 6px;
  height: 6px;
  flex: 0 0 6px;
}

.portfolio-case .scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 0;
  height: 2px;
}

.portfolio-footer {
  border-top: 1px solid var(--portfolio-footer-line, rgba(127,127,127,.24));
  background: var(--portfolio-footer-bg, transparent);
  color: var(--portfolio-footer-color, inherit);
}

.portfolio-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: var(--portfolio-content-width);
  margin-inline: auto;
  padding: 24px 0 30px;
  gap: 24px;
  font-size: 12px;
}

.portfolio-footer__brand {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .12em;
}

.portfolio-footer__meta { text-align: right; }

.portfolio-case--image {
  --portfolio-focus: #ff7043;
  --portfolio-focus-text: #1a2325;
  --portfolio-brand: #1a2325;
  --portfolio-brand-accent: #c4603d;
  --portfolio-footer-bg: #f8fafb;
  --portfolio-footer-color: #556468;
  --portfolio-footer-line: rgba(26,35,37,.14);
}

.portfolio-case--quant {
  --portfolio-focus: #0055ff;
  --portfolio-brand: #1c1b18;
  --portfolio-brand-accent: #0055ff;
  --portfolio-footer-bg: #f6f4ef;
  --portfolio-footer-color: #5c5a52;
  --portfolio-footer-line: #e2ded4;
}

.portfolio-case--jingzhang {
  --portfolio-focus: #8aa8bd;
  --portfolio-brand: #e9edf0;
  --portfolio-brand-accent: #b08d57;
  --portfolio-footer-bg: #0b0f13;
  --portfolio-footer-color: #7a8792;
  --portfolio-footer-line: #20282f;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}


/* Explicit portfolio navigation: usable without history or JavaScript. */
.portfolio-mark.portfolio-mark--with-home {
  display: flex;
  align-items: center;
  gap: 16px;
}

.portfolio-home-link {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 7px;
  box-sizing: border-box;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--portfolio-home-line, #d6e2f3);
  border-radius: 999px;
  background: var(--portfolio-home-bg, #ffffffed);
  color: var(--portfolio-home-color, #163fb1);
  font: 600 12px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  text-decoration: none;
  white-space: nowrap;
}

.portfolio-home-link > span {
  font: 400 19px/1 Arial, sans-serif;
}

.portfolio-home-link:hover {
  border-color: currentColor;
  background: var(--portfolio-home-hover, #edf4ff);
}

.portfolio-home-link:focus-visible {
  outline: 2px solid var(--portfolio-home-color, #163fb1);
  outline-offset: 4px;
}

.portfolio-footer__inner:has(.portfolio-home-link--footer) {
  flex-wrap: wrap;
}

.portfolio-footer__inner:has(.portfolio-home-link--footer) .portfolio-footer__meta {
  margin-left: auto;
}

.portfolio-case--quant {
  --portfolio-home-bg: #fffef9f2;
  --portfolio-home-line: #dddcd8;
}

.portfolio-case--image {
  --portfolio-home-color: #8c452b;
  --portfolio-home-line: #e6d8cd;
  --portfolio-home-hover: #fff3eb;
}

.portfolio-case--ioc,
.portfolio-case--grc.is-hero,
.portfolio-case--image .case-mark.is-inverse {
  --portfolio-home-bg: #0d1b30ed;
  --portfolio-home-color: #edf5ff;
  --portfolio-home-line: #60778f;
  --portfolio-home-hover: #1b304a;
}