/* ==========================================================================
   他石 · 设计案例详情 / 索引
   case.css
   ========================================================================== */

:root {
  --cs-ink: #14171A;
  --cs-ink-2: #22272C;
  --cs-paper: #F6F2EA;
  --cs-paper-2: #FCFAF6;
  --cs-line: #E2D9CA;
  --cs-line-2: #EFE9DE;
  --cs-text: #191C20;
  --cs-text-2: #5B6067;
  --cs-text-3: #8D9299;
  --cs-brass: #B07C3C;
  --cs-brass-2: #D3AA6C;
  --cs-brass-3: #8A5E28;
  --cs-sans: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB",
    "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui,
    -apple-system, "Segoe UI", Arial, sans-serif;
  --cs-ease: cubic-bezier(.22,.61,.36,1);
}

body.cs-page {
  margin: 0;
  background: var(--cs-paper);
  color: var(--cs-text);
  font-family: var(--cs-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

.cs-page img { max-width: 100%; display: block; }
.cs-page a { color: inherit; text-decoration: none; }
.cs-page ::selection { background: var(--cs-ink); color: var(--cs-paper-2); }

.cs-wrap { width: min(1180px, calc(100% - 56px)); margin: 0 auto; }
@media (max-width: 640px) { .cs-wrap { width: calc(100% - 32px); } }

/* ---------- header ---------- */
.cs-top {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(246,242,234,.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--cs-line);
}
.cs-top__in {
  height: 76px;
  display: flex;
  align-items: center;
  gap: 26px;
}
.cs-brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.cs-brand img { width: 34px; height: 34px; }
.cs-brand span { display: flex; flex-direction: column; line-height: 1.2; }
.cs-brand strong { font-size: 14px; font-weight: 700; letter-spacing: .02em; }
.cs-brand em { font-style: normal; font-size: 9px; letter-spacing: .2em; color: var(--cs-text-3); margin-top: 3px; }
.cs-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.cs-nav a {
  padding: 9px 13px;
  font-size: 13.5px;
  color: var(--cs-text-2);
  border-radius: 999px;
  transition: .2s var(--cs-ease);
}
.cs-nav a:hover { color: var(--cs-ink); background: rgba(20,23,26,.05); }
.cs-nav a.is-active { color: var(--cs-ink); background: #EFE7D9; font-weight: 600; }
.cs-top__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--cs-ink);
  color: var(--cs-paper-2) !important;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  flex: 0 0 auto;
}
.cs-top__cta svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.cs-top__cta:hover { background: var(--cs-brass-3); }
@media (max-width: 1000px) {
  .cs-nav { display: none; }
  .cs-top__cta { margin-left: auto; }
}
@media (max-width: 560px) {
  .cs-top__in { height: 66px; }
  .cs-brand em { display: none; }
  .cs-brand strong { font-size: 13px; }
}

/* ---------- hero ---------- */
.cs-hero { padding: 64px 0 0; }
.cs-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--cs-text-3);
  margin-bottom: 30px;
}
.cs-crumb a { color: var(--cs-text-2); }
.cs-crumb a:hover { color: var(--cs-brass-3); }
.cs-crumb span { color: var(--cs-line); }
.cs-crumb em { font-style: normal; color: var(--cs-text-3); }
.cs-kicker {
  margin: 0 0 14px;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 10.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cs-brass);
}
.cs-hero h1 {
  margin: 0 0 14px;
  max-width: 960px;
  font-size: clamp(32px, 4.4vw, 56px);
  line-height: 1.15;
  letter-spacing: -.035em;
  font-weight: 750;
}
.cs-sub { margin: 0; color: var(--cs-text-2); font-size: 15px; }

.cs-cover {
  margin: 38px 0 0;
  border: 1px solid var(--cs-line);
  background: var(--cs-paper-2);
  padding: 12px;
}
.cs-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #E6DED0;
}
.cs-cover figcaption {
  padding: 12px 4px 2px;
  font-size: 12.5px;
  color: var(--cs-text-3);
}

/* ---------- body ---------- */
.cs-body { padding: 70px 0 20px; }
.cs-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 64px;
  align-items: start;
}
.cs-prose h2 {
  margin: 0 0 16px;
  font-size: 24px;
  line-height: 1.35;
  letter-spacing: -.02em;
}
.cs-prose h2 + p { margin-top: 0; }
.cs-prose p {
  margin: 0 0 18px;
  color: var(--cs-text-2);
  font-size: 15.5px;
  line-height: 1.95;
}
.cs-prose p + h2 { margin-top: 40px; }
.cs-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--cs-line);
}
.cs-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--cs-line-2);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--cs-text-2);
}
.cs-list strong { color: var(--cs-ink); font-weight: 600; }

.cs-aside { position: sticky; top: 100px; }
.cs-facts {
  background: var(--cs-paper-2);
  border: 1px solid var(--cs-line);
  padding: 26px;
}
.cs-facts h2 {
  margin: 0 0 16px;
  font-size: 16px;
  letter-spacing: .02em;
}
.cs-facts dl { margin: 0 0 22px; }
.cs-facts dt {
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--cs-text-3);
  margin-top: 14px;
}
.cs-facts dt:first-child { margin-top: 0; }
.cs-facts dd { margin: 3px 0 0; font-size: 14px; color: var(--cs-ink); }
.cs-back {
  display: inline-block;
  margin-top: 18px;
  font-size: 13px;
  color: var(--cs-text-2);
  border-bottom: 1px solid var(--cs-line);
  padding-bottom: 2px;
}
.cs-back:hover { color: var(--cs-brass-3); border-color: var(--cs-brass-3); }

/* ---------- buttons ---------- */
.cs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  background: var(--cs-ink);
  color: var(--cs-paper-2) !important;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .03em;
  transition: .2s var(--cs-ease);
}
.cs-btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.cs-btn:hover { background: var(--cs-brass-3); }
.cs-btn--light { background: var(--cs-brass-2); color: #1A130A !important; }
.cs-btn--light:hover { background: #E2BC82; }
.cs-btn--ghost { background: transparent; border-color: rgba(255,255,255,.28); color: #F6F2EA !important; }
.cs-btn--ghost:hover { background: rgba(255,255,255,.1); border-color: #fff; }
.cs-btn--ghost-dark { background: transparent; border-color: var(--cs-line); color: var(--cs-ink) !important; }
.cs-btn--ghost-dark:hover { border-color: var(--cs-ink); background: transparent; }

/* ---------- related ---------- */
.cs-related { padding: 40px 0 80px; }
.cs-related__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}
.cs-related__head h2 { margin: 0; font-size: 26px; letter-spacing: -.02em; }
.cs-related__head a { font-size: 13px; color: var(--cs-text-2); border-bottom: 1px solid var(--cs-line); }
.cs-related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.cs-card { display: block; background: var(--cs-paper-2); border: 1px solid var(--cs-line); }
.cs-card figure { margin: 0; overflow: hidden; background: #E6DED0; }
.cs-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; transition: transform .7s var(--cs-ease); }
.cs-card:hover img { transform: scale(1.04); }
.cs-card h3 { margin: 16px 18px 6px; font-size: 15px; line-height: 1.5; }
.cs-card p { margin: 0 18px 18px; font-size: 12.5px; color: var(--cs-text-3); }
.cs-card__body { padding: 16px 18px 20px; }
.cs-card__no {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--cs-brass);
}
.cs-card__body h2 { margin: 8px 0 6px; font-size: 15px; line-height: 1.5; }
.cs-card__body p { margin: 0 0 14px; font-size: 12.5px; color: var(--cs-text-3); }
.cs-card__more { font-size: 12px; color: var(--cs-brass-3); }

/* ---------- index ---------- */
.cs-index-hero {
  padding: 84px 0 64px;
  background: radial-gradient(900px 420px at 82% -10%, rgba(176,124,60,.16), transparent 60%), var(--cs-paper);
  border-bottom: 1px solid var(--cs-line);
}
.cs-index-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 4.8vw, 60px);
  line-height: 1.12;
  letter-spacing: -.04em;
}
.cs-index-hero__lead { max-width: 620px; margin: 0 0 30px; color: var(--cs-text-2); font-size: 15.5px; }
.cs-index-hero__actions { display: flex; gap: 10px; flex-wrap: wrap; }
.cs-index { padding: 64px 0 30px; }
.cs-index__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cs-card--index h2 { margin: 8px 0 6px; }
.cs-card--index .cs-card__body { padding: 16px 18px 20px; }

/* ---------- cta ---------- */
.cs-cta { background: var(--cs-ink); color: var(--cs-paper-2); padding: 70px 0; }
.cs-cta__in { display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.cs-cta h2 { margin: 0; color: var(--cs-paper-2); font-size: clamp(28px, 3.4vw, 44px); line-height: 1.18; letter-spacing: -.03em; }
.cs-cta .cs-kicker { color: var(--cs-brass-2); }
.cs-cta__actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- footer ---------- */
.cs-foot { background: #121518; color: #CFC6B8; padding: 60px 0 24px; }
.cs-foot__in { display: grid; grid-template-columns: 1.1fr 1.3fr; gap: 50px; }
.cs-foot__brand a { display: flex; align-items: center; gap: 12px; }
.cs-foot__brand img { width: 40px; height: 40px; filter: brightness(0) invert(1); opacity: .9; }
.cs-foot__brand span { display: flex; flex-direction: column; line-height: 1.2; }
.cs-foot__brand strong { color: #fff; font-size: 15px; }
.cs-foot__brand em { font-style: normal; font-size: 9px; letter-spacing: .2em; color: #8E8577; margin-top: 4px; }
.cs-foot__brand p { max-width: 360px; margin: 18px 0 0; font-size: 12.5px; line-height: 1.8; color: #8E8577; }
.cs-foot__links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cs-foot__links h3 { margin: 0 0 12px; font-size: 12px; letter-spacing: .1em; color: #fff; }
.cs-foot__links a, .cs-foot__links p { display: block; margin: 0 0 8px; font-size: 12.5px; color: #8E8577; line-height: 1.7; }
.cs-foot__links a:hover { color: var(--cs-brass-2); }
.cs-foot__bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 44px;
  padding-top: 18px;
  border-top: 1px solid #262B30;
  font-size: 11.5px;
  color: #6F6A60;
}
.cs-foot__bottom a { color: #8E8577; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .cs-grid { grid-template-columns: 1fr; gap: 34px; }
  .cs-aside { position: static; }
  .cs-related__grid, .cs-index__grid { grid-template-columns: 1fr 1fr; }
  .cs-foot__in { grid-template-columns: 1fr; gap: 30px; }
}
@media (max-width: 640px) {
  .cs-hero { padding-top: 40px; }
  .cs-body { padding-top: 46px; }
  .cs-related__grid, .cs-index__grid { grid-template-columns: 1fr; }
  .cs-foot__links { grid-template-columns: 1fr 1fr; }
  .cs-cta__in { align-items: flex-start; flex-direction: column; }
  .cs-index-hero { padding: 56px 0 44px; }
}