html, body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-main);
  font: 16px/1.55 var(--font, system-ui, sans-serif);
}
html[data-theme="dark"] .mark-light,
html[data-theme="light"] .mark-dark { display: none; }

/* 头部 */
.zx-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--glass, var(--bg-page));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.zx-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}
.zx-brand img { height: 40px; width: auto; }
.zx-brand strong { display: block; font-size: 18px; line-height: 1.2; }
.zx-brand em { display: block; font-style: normal; color: var(--text-muted); font-size: 12px; }
.zx-head nav { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.zx-head nav a {
  color: var(--text-main);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 14px;
}
.zx-head nav a:hover { background: var(--bg-subtle); }
.zx-head nav a.nav-home {
  border: 1px solid var(--border-color);
}

/* 通用区块 */
.zx-hero, .zx-studio, .zx-wall, .zx-note, .zx-foot {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px;
}
.kicker { color: var(--accent-brand); letter-spacing: 0.08em; font-size: 12px; margin: 0; }
.zx-hero h1 { font-size: clamp(28px, 5vw, 44px); margin: 8px 0 12px; line-height: 1.15; }
.lead { color: var(--text-muted); font-size: clamp(15px, 2.2vw, 18px); max-width: 640px; margin: 0; }
.hint { color: var(--text-muted); font-size: 14px; margin: 4px 0 0; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.sec-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.sec-head h2, .zx-note h2 { font-size: 22px; margin: 0; }
.sec-head .sub { color: var(--text-muted); margin: 0; font-size: 14px; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, background-color 0.15s ease, border-color 0.15s ease;
}
.btn:hover { border-color: var(--text-faint); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent-brand);
  color: var(--accent-brand-text);
  border-color: var(--accent-brand);
}
.btn-primary:hover { filter: brightness(1.06); border-color: var(--accent-brand); }
.btn-ghost { background: var(--bg-subtle); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

/* 成片墙 */
.zx-wall { padding-top: 12px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.grid button.cell {
  all: unset;
  display: block;
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  cursor: zoom-in;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.grid button.cell:hover { transform: translateY(-2px); border-color: var(--accent-brand); }
.grid button.cell:focus-visible { outline: 2px solid var(--accent-brand); outline-offset: 2px; }
.grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #fff;
  display: block;
}
.grid .cap {
  position: absolute;
  left: 10px;
  bottom: 10px;
  margin: 0;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--tooltip-bg, rgba(0, 0, 0, 0.7));
  color: var(--text-main);
  font-size: 12px;
  box-shadow: var(--tooltip-shadow);
}
@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; gap: 12px; }
}

/* 裁方 */
.studio-body {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 20px;
  align-items: start;
}
@media (max-width: 720px) {
  .studio-body { grid-template-columns: 1fr; }
}
.stage {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
}
.stage img { width: 100%; display: block; background: #fff; aspect-ratio: 1; object-fit: contain; }
.tag {
  position: absolute; left: 12px; top: 12px;
  margin: 0; padding: 3px 9px; border-radius: 999px;
  background: var(--accent-brand); color: var(--accent-brand-text);
  font-size: 12px; font-weight: 600;
}
.panel { display: flex; flex-direction: column; gap: 10px; }
.panel .btn { width: 100%; }
.file { text-align: center; }
.file input { display: none; }

/* 说明 / 页脚 */
.zx-note ul { color: var(--text-muted); padding-left: 18px; margin: 12px 0 0; }
.zx-note li + li { margin-top: 6px; }
.zx-foot {
  display: flex;
  gap: 8px 18px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border-color);
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 14px;
}
.zx-foot a { color: var(--text-main); text-decoration: none; }
.zx-foot a:hover { color: var(--accent-brand); }

/* 灯箱 */
.zx-lightbox {
  border: 0;
  padding: 0;
  background: transparent;
  max-width: min(92vw, 820px);
  width: 100%;
  color: var(--text-main);
}
.zx-lightbox::backdrop { background: rgba(0, 0, 0, 0.82); }
.zx-lightbox img {
  width: 100%;
  max-height: 78vh;
  object-fit: contain;
  border-radius: 16px;
  background: #fff;
  display: block;
}
.lb-nav { display: flex; justify-content: center; gap: 10px; margin-top: 12px; }
.lb-nav .btn { background: var(--bg-card); }
.lb-close {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  z-index: 1;
}
@media (max-width: 720px) {
  .lb-close { top: 6px; right: 6px; }
}