:root { color-scheme: dark; --case-bg: #050609; --case-text: #f4f5f8; --case-muted: #9b9da7; --case-rule: #292b32; --case-accent: #6688ff; --case-max: 1920px; --case-media-max: 900px; --case-media-gap: 32px; --case-gutter: clamp(20px, 4vw, 64px); }
* { box-sizing: border-box; }
html { background: var(--case-bg); scroll-behavior: smooth; scroll-padding-top: 86px; }
body { margin: 0; color: var(--case-text); font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; -webkit-text-size-adjust: 100%; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--case-accent); outline-offset: 6px; }
.case-skip { position: fixed; z-index: 20; top: 12px; left: 16px; padding: 12px 16px; background: #151820; transform: translateY(-180%); }
.case-skip:focus { transform: none; }
.case-header { position: sticky; z-index: 10; top: 0; display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 72px; padding: 16px var(--case-gutter); border-bottom: 1px solid var(--case-rule); background: rgba(5, 6, 9, .94); backdrop-filter: blur(18px); }
.case-header__back { display: inline-flex; align-items: center; min-height: 40px; gap: 14px; font-size: 14px; }
.case-header__identity { color: var(--case-muted); font-size: 11px; letter-spacing: .13em; }
.case-progress { position: absolute; left: 0; bottom: -1px; width: 100%; height: 2px; background: var(--case-accent); transform: scaleX(0); transform-origin: left; }
.case-intro { max-width: var(--case-max); margin: auto; padding: clamp(40px, 6vw, 96px) var(--case-gutter) clamp(32px, 4vw, 64px); }
.case-eyebrow { margin: 0 0 20px; color: var(--case-muted); font-size: 11px; line-height: 1.6; letter-spacing: .2em; }
.case-intro h1 { margin: 0 0 20px; font-size: clamp(30px, 4.1vw, 68px); font-weight: 500; line-height: 1.25; letter-spacing: -.025em; text-wrap: balance; }
.case-intro__bottom { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; }
.case-intro__subtitle { margin: 0; color: #bbbcc7; font-size: clamp(14px, 1.25vw, 18px); line-height: 1.8; }
.case-tags { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.case-tags span { padding: 7px 12px; border: 1px solid var(--case-rule); border-radius: 30px; color: #bbbcc7; font-size: 11px; line-height: 1.5; white-space: nowrap; }
.case-media { display: grid; gap: var(--case-media-gap); width: 100%; max-width: var(--case-media-max); margin: auto; overflow: hidden; }
.case-media figure { margin: 0; line-height: 0; }
.case-media img, .case-media video { display: block; width: 100%; height: auto; margin: 0; }
.case-media img { background: #11141d; }
.case-media a { display: block; }
.case-media video { object-fit: contain; background: #090b12; }
.case-footer { max-width: var(--case-max); margin: auto; padding: clamp(48px, 7vw, 112px) var(--case-gutter) 32px; }
.case-footer__eyebrow { margin: 0 0 20px; color: var(--case-muted); font-size: 11px; letter-spacing: .2em; }
.case-next { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 0 32px; border-bottom: 1px solid var(--case-rule); }
.case-next h2 { margin: 0; font-size: clamp(26px, 3vw, 48px); font-weight: 500; line-height: 1.3; }
.case-next span { font-size: 34px; }
.case-next:hover, .case-header__back:hover, .case-footer__bottom a:hover { color: var(--case-accent); }
.case-footer__bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 28px; color: var(--case-muted); font-size: 12px; line-height: 1.8; }
.case-footer__bottom a { display: inline-flex; min-height: 36px; align-items: center; }
.case-top { position: fixed; right: max(20px, env(safe-area-inset-right)); bottom: max(20px, env(safe-area-inset-bottom)); z-index: 9; display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid #676b79; border-radius: 50%; background: #0b0d13e6; font-size: 22px; }
@media (max-width: 640px) {
  html { scroll-padding-top: 64px; }
  .case-header { min-height: 64px; gap: 12px; padding-block: 10px; }
  .case-header__back { font-size: 13px; gap: 8px; }
  .case-header__identity { font-size: 9px; letter-spacing: .06em; }
  .case-intro__bottom { flex-direction: column; gap: 18px; }
  .case-tags { justify-content: flex-start; }
  .case-intro { padding-top: 40px; }
  .case-eyebrow { margin-bottom: 16px; }
  .case-footer__bottom { flex-wrap: wrap; padding-right: 44px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }