.essays-body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.75;
}

/* Header */
.es-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
  padding: env(safe-area-inset-top) 0 0;
}
.es-header-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 14px 20px 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: flex-end;
  justify-content: space-between;
}
.es-back {
  display: inline-block;
  font-size: 0.86rem;
  color: var(--accent-strong);
  text-decoration: none;
  margin-bottom: 6px;
}
.es-back:hover { text-decoration: underline; }
.es-titles h1 { margin: 0; font-size: 1.3rem; }
.es-sub { margin: 4px 0 0; font-size: 0.86rem; color: var(--muted); }
.es-sub strong { color: var(--accent-strong); font-weight: 600; }

.es-controls { display: flex; gap: 8px; }
.es-ctrl-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  cursor: pointer;
}
.es-ctrl-btn:hover { border-color: var(--accent); }

.es-nav {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.es-nav-chapter {
  font-size: 0.72rem;
  color: var(--muted);
  margin-left: 6px;
}
.es-nav-chapter:first-child { margin-left: 0; }
.es-nav-link {
  flex: 0 0 auto;
  min-width: 1.8em;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-strong);
  text-decoration: none;
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface);
}
.es-nav-link:hover { border-color: var(--accent); background: var(--surface-soft); }

/* List */
.es-main { max-width: 880px; margin: 0 auto; padding: 18px 20px 80px; }
.es-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.es-item { scroll-margin-top: 130px; }

.es-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.es-card-head {
  list-style: none;
  cursor: pointer;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
}
.es-card-head::-webkit-details-marker { display: none; }
.es-card[open] .es-card-head { border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.es-num {
  flex: 0 0 auto;
  width: 1.9em;
  height: 1.9em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.92rem;
  color: #fff8ef;
  background: var(--accent);
  border-radius: 50%;
}
.es-title-wrap { display: flex; flex-direction: column; gap: 2px; }
.es-chapter { font-size: 0.72rem; font-weight: 700; color: var(--accent-strong); }
.es-q-title { font-size: 1.02rem; font-weight: 700; color: var(--text); line-height: 1.5; }
.es-card-head::after {
  content: "▸";
  margin-left: auto;
  color: var(--muted);
  align-self: center;
  transition: transform 0.15s;
}
.es-card[open] .es-card-head::after { transform: rotate(90deg); }

.es-body { padding: 6px 18px 18px; }

.es-section { margin-top: 14px; }
.es-section-title {
  margin: 0 0 6px;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--accent-strong);
  padding-left: 10px;
  border-left: 4px solid var(--accent);
}
.es-para { margin: 0 0 8px; font-size: 0.94rem; text-indent: 2em; }
.es-lead { margin: 10px 0 4px; font-size: 0.94rem; font-weight: 700; color: var(--text); }
.es-subs { list-style: none; margin: 0 0 4px; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.es-sub {
  font-size: 0.92rem;
  color: var(--text);
  padding: 7px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}
.es-summary {
  text-indent: 2em;
  background: var(--green-soft);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  margin-top: 4px;
}

@media (max-width: 560px) {
  .es-q-title { font-size: 0.96rem; }
  .es-para, .es-summary { text-indent: 1.6em; }
  .es-main { padding: 14px 14px 60px; }
}