/* 开发者中心 · 头条式宽屏阅读 */
:root {
  --dev-bg: #f2f3f5;
  --dev-panel: #ffffff;
  --dev-text: #1f2329;
  --dev-muted: #8f959e;
  --dev-line: #e5e6eb;
  --dev-accent: #e11d2e;
  --dev-accent-soft: #fff1f0;
  --dev-side-w: 248px;
  --dev-rail-w: 300px;
  --dev-max: 1520px;
  --dev-radius: 12px;
  --dev-shadow: 0 1px 2px rgba(31, 35, 41, 0.04), 0 4px 16px rgba(31, 35, 41, 0.04);
}

.developer-reader-body {
  background:
    radial-gradient(1200px 420px at 12% -10%, rgba(225, 29, 46, 0.06), transparent 55%),
    radial-gradient(900px 380px at 88% 0%, rgba(59, 130, 246, 0.05), transparent 50%),
    var(--dev-bg);
}

.dev-page {
  min-height: calc(100vh - 72px);
  padding: 16px 20px 40px;
}

.dev-shell {
  display: grid;
  grid-template-columns: var(--dev-side-w) minmax(0, 1fr);
  max-width: var(--dev-max);
  margin: 0 auto;
  gap: 16px;
  align-items: start;
  min-height: calc(100vh - 104px);
}

.dev-shell--reader {
  grid-template-columns: var(--dev-side-w) minmax(0, 1fr) var(--dev-rail-w);
}

.dev-sidebar {
  background: var(--dev-panel);
  border: 1px solid var(--dev-line);
  border-radius: var(--dev-radius);
  box-shadow: var(--dev-shadow);
  position: sticky;
  top: 88px;
  align-self: start;
  max-height: calc(100vh - 104px);
  overflow: auto;
  padding: 14px 0 18px;
}

.dev-sidebar-head {
  padding: 6px 18px 14px;
  border-bottom: 1px solid var(--dev-line);
  margin-bottom: 6px;
}

.dev-sidebar-brand {
  display: block;
  font-size: 18px;
  font-weight: 750;
  letter-spacing: 0.02em;
  color: var(--dev-text);
  text-decoration: none;
}

.dev-sidebar-sub {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--dev-muted);
}

.dev-nav-group {
  margin: 6px 8px;
}

.dev-nav-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border: 0;
  background: transparent;
  padding: 12px 10px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--dev-text);
  text-align: left;
  transition: background .15s ease;
}

.dev-nav-toggle:hover,
.dev-nav-group.is-open > .dev-nav-toggle,
.dev-nav-group.is-current > .dev-nav-toggle {
  background: #f7f8fa;
}

.dev-nav-toggle-main {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.dev-nav-icon {
  flex: 0 0 auto;
  border-radius: 50%;
  object-fit: cover;
  background: #f3f4f6;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.04);
}

.dev-nav-icon--fallback {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #ff6b6b, #e11d2e);
}

.dev-nav-label {
  font-size: 14px;
  font-weight: 650;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dev-nav-caret {
  width: 7px;
  height: 7px;
  border-right: 1.6px solid #a0a4ab;
  border-bottom: 1.6px solid #a0a4ab;
  transform: rotate(-45deg);
  transition: transform .18s ease;
  flex: 0 0 auto;
  margin-right: 4px;
}

.dev-nav-group.is-open .dev-nav-caret {
  transform: rotate(45deg);
}

.dev-nav-articles {
  list-style: none;
  margin: 2px 0 10px;
  padding: 4px 8px 8px 40px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dev-nav-link {
  display: block;
  padding: 10px 8px;
  border-radius: 8px;
  color: #646a73;
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dev-nav-link:hover {
  background: #f7f8fa;
  color: var(--dev-text);
}

.dev-nav-link.is-on {
  background: var(--dev-accent-soft);
  color: var(--dev-accent);
  font-weight: 650;
}

.dev-nav-empty,
.dev-nav-tip,
.dev-muted {
  color: var(--dev-muted);
  font-size: 13px;
  padding: 8px 12px;
}

.dev-main {
  background: var(--dev-panel);
  border: 1px solid var(--dev-line);
  border-radius: var(--dev-radius);
  box-shadow: var(--dev-shadow);
  min-width: 0;
  padding: 28px 36px 48px;
}

.dev-shell--reader .dev-main {
  padding: 32px 40px 56px;
}

.dev-empty {
  max-width: 640px;
  margin: 80px auto;
  text-align: center;
  color: var(--dev-muted);
}

.dev-empty h1 {
  color: var(--dev-text);
  font-size: 28px;
  margin: 0 0 12px;
}

.dev-cat-head h1,
.dev-article-head h1 {
  margin: 0 0 14px;
  font-size: 32px;
  line-height: 1.35;
  font-weight: 750;
  color: var(--dev-text);
  letter-spacing: -0.01em;
}

.dev-lead {
  margin: 0 0 20px;
  color: #4e5969;
  font-size: 16px;
  line-height: 1.75;
}

.dev-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--dev-muted);
}

.dev-crumb a {
  color: var(--dev-muted);
  text-decoration: none;
}

.dev-crumb a:hover {
  color: var(--dev-accent);
}

.dev-author-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0 26px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--dev-line);
}

.dev-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.dev-avatar--text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, #2b2f36, #111827);
  color: #fff;
  font-weight: 700;
}

.dev-author-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.dev-author-meta strong {
  font-size: 14px;
  color: var(--dev-text);
}

.dev-author-meta span {
  font-size: 12px;
  color: var(--dev-muted);
}

.dev-follow-btn {
  border: 1px solid var(--dev-accent);
  background: var(--dev-accent);
  color: #fff;
  border-radius: 16px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}

.dev-follow-btn.is-on,
#xhs-follow-btn.is-on,
#xhs-follow-btn.is-following {
  background: #fff;
  color: var(--dev-accent);
}

.dev-prose {
  font-size: 17px;
  line-height: 1.9;
  color: #1f2329;
  max-width: none;
}

.dev-prose img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
}

.dev-prose p { margin: 0 0 1.15em; }
.dev-prose h2, .dev-prose h3 {
  margin: 1.4em 0 0.7em;
  font-weight: 720;
  line-height: 1.35;
}
.dev-prose h2 { font-size: 22px; }
.dev-prose h3 { font-size: 18px; }
.dev-prose ul, .dev-prose ol {
  padding-left: 1.35em;
  margin: 0 0 1.1em;
}
.dev-prose li { margin: 0.35em 0; }

/* 右侧互动栏 */
.dev-rail {
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.dev-rail-card {
  background: var(--dev-panel);
  border: 1px solid var(--dev-line);
  border-radius: var(--dev-radius);
  box-shadow: var(--dev-shadow);
  padding: 16px;
}

.dev-rail-author {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.dev-rail-author .dev-avatar {
  width: 48px;
  height: 48px;
}

.dev-rail-author > div {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.dev-rail-author strong {
  font-size: 14px;
  color: var(--dev-text);
}

.dev-rail-author span {
  font-size: 12px;
  color: var(--dev-muted);
}

.dev-author-tags {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 160px;
}

.dev-rail-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.dev-rail-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--dev-line);
  background: #fafbfc;
  border-radius: 10px;
  padding: 10px 6px 8px;
  cursor: pointer;
  color: #4e5969;
  font-size: 12px;
  transition: border-color .15s ease, background .15s ease, color .15s ease;
}

.dev-rail-action:hover {
  border-color: #f3b4b8;
  background: var(--dev-accent-soft);
}

.dev-rail-action.is-on,
.dev-rail-action.is-liked,
.dev-rail-action.is-faved {
  border-color: #f3b4b8;
  background: var(--dev-accent-soft);
  color: var(--dev-accent);
}

.dev-rail-action em {
  font-style: normal;
  font-weight: 650;
  font-size: 13px;
}

.dev-ico {
  width: 20px;
  height: 20px;
  display: inline-block;
  background: currentColor;
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
}

.dev-ico--like {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8'%3E%3Cpath d='M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8'%3E%3Cpath d='M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z'/%3E%3C/svg%3E");
}

.dev-ico--fav {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8'%3E%3Cpath d='M12 2l2.4 7.4H22l-6 4.6 2.3 7-6.3-4.5L5.7 21 8 14 2 9.4h7.6z'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8'%3E%3Cpath d='M12 2l2.4 7.4H22l-6 4.6 2.3 7-6.3-4.5L5.7 21 8 14 2 9.4h7.6z'/%3E%3C/svg%3E");
}

.dev-ico--comment {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8'%3E%3Cpath stroke-linejoin='round' d='M21 11.5a8.38 8.38 0 0 1-.9 3.8 8.5 8.5 0 0 1-7.6 4.7 8.38 8.38 0 0 1-3.8-.9L3 21l1.9-5.7a8.38 8.38 0 0 1-.9-3.8 8.5 8.5 0 0 1 4.7-7.6 8.38 8.38 0 0 1 3.8-.9h.5a8.48 8.48 0 0 1 8 8v.5z'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8'%3E%3Cpath stroke-linejoin='round' d='M21 11.5a8.38 8.38 0 0 1-.9 3.8 8.5 8.5 0 0 1-7.6 4.7 8.38 8.38 0 0 1-3.8-.9L3 21l1.9-5.7a8.38 8.38 0 0 1-.9-3.8 8.5 8.5 0 0 1 4.7-7.6 8.38 8.38 0 0 1 3.8-.9h.5a8.48 8.48 0 0 1 8 8v.5z'/%3E%3C/svg%3E");
}

.dev-rail-title {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  color: var(--dev-text);
}

.dev-related {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dev-related li + li {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--dev-line);
}

.dev-related a {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.dev-related img,
.dev-related-ph {
  width: 72px;
  height: 54px;
  border-radius: 8px;
  object-fit: cover;
  background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
}

.dev-related strong {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.45;
  color: var(--dev-text);
}

.dev-related span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--dev-muted);
}

.dev-comments {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--dev-line);
}

.dev-comments h3 {
  font-size: 18px;
  margin: 0 0 16px;
}

.dev-comment-form {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.dev-comment-form input {
  flex: 1;
  border: 1px solid var(--dev-line);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 14px;
  background: #fafbfc;
}

.dev-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: var(--dev-accent);
  color: #fff;
  border-radius: 10px;
  padding: 10px 18px;
  text-decoration: none;
  cursor: pointer;
  font-size: 14px;
}

.dev-btn--sm { padding: 10px 14px; }

.dev-login-tip {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--dev-accent);
  font-size: 14px;
}

.dev-article-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dev-article-list li + li {
  border-top: 1px solid var(--dev-line);
}

.dev-article-list a {
  display: block;
  padding: 18px 4px;
  text-decoration: none;
  color: inherit;
}

.dev-article-list strong {
  display: block;
  font-size: 17px;
  color: var(--dev-text);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dev-article-list span {
  color: var(--dev-muted);
  font-size: 13px;
  line-height: 1.5;
}

.dev-alert {
  padding: 10px 12px;
  border-radius: 8px;
  background: #ecfdf5;
  color: #065f46;
  margin-bottom: 16px;
}

.dev-alert--error {
  background: #fef2f2;
  color: #991b1b;
}

.dev-paywall {
  margin: 24px 0;
  padding: 24px;
  border: 1px solid var(--dev-line);
  border-radius: 12px;
  max-width: 420px;
}

.dev-paywall-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--dev-accent);
}

@media (max-width: 1280px) {
  .dev-shell--reader {
    grid-template-columns: var(--dev-side-w) minmax(0, 1fr);
  }
  .dev-rail {
    grid-column: 2;
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

@media (max-width: 960px) {
  .dev-page { padding: 10px 12px 28px; }
  .dev-shell,
  .dev-shell--reader {
    grid-template-columns: 1fr;
  }
  .dev-sidebar {
    position: static;
    max-height: none;
  }
  .dev-main {
    padding: 20px 16px 40px;
  }
  .dev-rail {
    grid-column: auto;
    grid-template-columns: 1fr;
  }
  .dev-article-head h1 {
    font-size: 24px;
  }
}