:root {
  --sf-bg: #f5f7fb;
  --sf-bg-elevated: #ffffff;
  --sf-border-subtle: #e2e6f0;
  --sf-primary: #1e9fff;
  --sf-primary-soft: rgba(30, 159, 255, 0.07);
  --sf-primary-strong: #007fff;
  --sf-text-main: #1f2933;
  --sf-text-sub: #6b7280;
  --sf-text-light: #9ca3af;
  --sf-tag-bg: #f3f4ff;
  --sf-tag-text: #4b5bd5;
  --sf-radius-lg: 14px;
  --sf-radius-md: 10px;
  --sf-radius-pill: 999px;
  --sf-shadow-card: 0 18px 40px rgba(15, 23, 42, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'SF Pro Text',
    'Segoe UI', sans-serif;
  background-color: var(--sf-bg);
  color: var(--sf-text-main);
}

body {
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.sf-page {
  min-height: 100vh;
  background: radial-gradient(circle at 0 0, #e6f3ff, transparent 55%),
    radial-gradient(circle at 100% 0, #e9eaff, transparent 55%), var(--sf-bg);
}

/* Header */

.sf-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(245, 247, 251, 0.92);
  border-bottom: 1px solid rgba(226, 230, 240, 0.8);
}

.sf-header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.sf-logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.sf-logo-icon {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--sf-primary), #52b4ff);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  box-shadow: 0 10px 25px rgba(30, 159, 255, 0.35);
}

.sf-logo-text {
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.sf-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
}

.sf-nav-item {
  padding: 6px 14px;
  border-radius: var(--sf-radius-pill);
  font-size: 14px;
  color: var(--sf-text-sub);
  transition: all 0.18s ease;
}

.sf-nav-item:hover {
  background: rgba(15, 23, 42, 0.02);
  color: var(--sf-text-main);
}

.sf-nav-item--active {
  background: var(--sf-primary-soft);
  color: var(--sf-primary-strong);
}

.sf-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.sf-search {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background-color: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(212, 219, 235, 0.9);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
  min-width: 210px;
}

.sf-search-icon {
  font-size: 14px;
  opacity: 0.7;
}

.sf-search-input {
  border: none;
  outline: none;
  background: transparent;
  font-size: 13px;
  flex: 1;
  color: var(--sf-text-main);
}

.sf-search-input::placeholder {
  color: var(--sf-text-light);
}

.sf-btn {
  font-size: 13px;
  border-radius: 999px;
  padding: 7px 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: all 0.16s ease;
  white-space: nowrap;
}

.sf-btn--ghost {
  background: transparent;
  color: var(--sf-text-main);
}

.sf-btn--ghost:hover {
  background: rgba(15, 23, 42, 0.04);
}

.sf-btn--primary {
  background: var(--sf-primary-strong);
  color: #fff;
  box-shadow: 0 12px 30px rgba(0, 127, 255, 0.4);
}

.sf-btn--primary:hover {
  background: #006fe0;
  transform: translateY(-0.5px);
}

.sf-btn--follow {
  border-radius: 999px;
  padding: 4px 10px;
  border: 1px solid rgba(30, 159, 255, 0.3);
  background: rgba(30, 159, 255, 0.04);
  color: var(--sf-primary-strong);
  font-size: 12px;
}

.sf-btn--follow:hover {
  background: rgba(30, 159, 255, 0.1);
}

/* Layout */

.sf-main {
  padding: 18px 0 32px;
}

.sf-main-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(260px, 1.3fr);
  gap: 20px;
  align-items: flex-start;
}

.sf-main-left {
  min-width: 0;
}

.sf-main-right {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Toolbar */

.sf-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.sf-toolbar-left,
.sf-toolbar-right {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sf-chip {
  border-radius: 999px;
  padding: 4px 11px;
  font-size: 13px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--sf-text-sub);
  transition: all 0.16s ease;
}

.sf-chip--active {
  background: var(--sf-primary-soft);
  color: var(--sf-primary-strong);
  border-color: rgba(30, 159, 255, 0.35);
}

.sf-chip--ghost {
  border-color: rgba(148, 163, 184, 0.45);
}

.sf-chip:hover {
  background: rgba(15, 23, 42, 0.03);
  color: var(--sf-text-main);
}

/* Cards & List */

.sf-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sf-card {
  background-color: var(--sf-bg-elevated);
  border-radius: var(--sf-radius-lg);
  border: 1px solid rgba(226, 231, 244, 0.9);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.05);
}

.sf-card--article {
  padding: 15px 18px 13px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  cursor: pointer;
  transition: box-shadow 0.16s ease, transform 0.16s ease,
    border-color 0.16s ease;
}

.sf-card--article:hover {
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.09);
  transform: translateY(-1px);
  border-color: rgba(30, 159, 255, 0.35);
}

.sf-article-top {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-dot {
  width: 3px;
  height: 3px;
  border-radius: 999px;
  background-color: var(--sf-text-light);
}

.sf-article-title {
  font-size: 16px;
  font-weight: 600;
  color: #111827;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sf-article-desc {
  font-size: 13px;
  color: var(--sf-text-sub);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sf-article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.sf-article-left-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-article-stats {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sf-article-stat {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.sf-article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sf-tag {
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--sf-tag-bg);
  color: var(--sf-tag-text);
}

.sf-author-name-inline {
  color: #111827;
}

/* Side Cards */

.sf-card--side {
  padding: 14px 14px 12px;
}

.sf-card--minimal {
  box-shadow: none;
  background: transparent;
  border-radius: 0;
  border: none;
  padding: 2px 0 0;
}

.sf-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.sf-card-title {
  font-size: 14px;
  font-weight: 600;
}

.sf-card-link {
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-card-link:hover {
  color: var(--sf-primary-strong);
}

.sf-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.sf-tag-pill {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--sf-radius-pill);
  background-color: rgba(148, 163, 184, 0.14);
  color: #4b5563;
  transition: all 0.16s ease;
}

.sf-tag-pill--hot {
  background: rgba(30, 159, 255, 0.07);
  color: var(--sf-primary-strong);
}

.sf-tag-pill:hover {
  background-color: rgba(148, 163, 184, 0.22);
}

.sf-author-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sf-author-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sf-avatar {
  border-radius: 12px;
  background: linear-gradient(135deg, #4b5bd5, #7b8dff);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.sf-avatar--sm {
  width: 30px;
  height: 30px;
  font-size: 14px;
}

.sf-author-meta {
  flex: 1;
  min-width: 0;
}

.sf-author-name {
  font-size: 13px;
  font-weight: 600;
}

.sf-author-desc {
  font-size: 12px;
  color: var(--sf-text-light);
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.sf-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sf-tag-cloud-item {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: var(--sf-radius-pill);
  background-color: rgba(15, 23, 42, 0.03);
  color: #4b5563;
}

.sf-tag-cloud-item--lg {
  font-weight: 500;
  background-color: rgba(30, 159, 255, 0.08);
  color: var(--sf-primary-strong);
}

/* Footer */

.sf-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-footer-link:hover {
  color: var(--sf-primary-strong);
}

.sf-footer-copy {
  margin-top: 6px;
  font-size: 11px;
  color: var(--sf-text-light);
}

/* Article detail */

.sf-article-page {
  padding: 22px 0 40px;
}

.sf-article-layout {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(220px, 1.2fr);
  gap: 22px;
  align-items: flex-start;
}

.sf-article-main-card {
  padding: 22px 22px 20px;
}

.sf-article-back-link {
  display: inline-block;
  font-size: 12px;
  color: var(--sf-text-light);
  margin-bottom: 8px;
}

.sf-article-back-link:hover {
  color: var(--sf-primary-strong);
}

.sf-article-title-lg {
  font-size: 24px;
  font-weight: 700;
  margin: 6px 0 10px;
  color: #111827;
}

.sf-article-submeta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.sf-article-submeta-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sf-article-submeta-author {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sf-article-submeta-extra {
  font-size: 12px;
  color: var(--sf-text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}

.sf-article-submeta-right {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-article-body {
  font-size: 14px;
  color: #111827;
  line-height: 1.8;
}

.sf-article-body p {
  margin: 0 0 10px;
}

.sf-article-body p:last-child {
  margin-bottom: 0;
}

.sf-article-detail-tags {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sf-recommend-title {
  font-size: 13px;
  color: #111827;
}

.sf-recommend-title:hover {
  color: var(--sf-primary-strong);
}

/* Editor */

.sf-editor-page {
  padding: 22px 0 40px;
}

.sf-editor-layout {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

.sf-editor-card {
  padding: 20px 22px 20px;
}

.sf-editor-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sf-editor-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sf-editor-row--inline {
  flex-direction: row;
  gap: 12px;
}

.sf-editor-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sf-editor-label {
  font-size: 13px;
  color: var(--sf-text-sub);
}

.sf-editor-input {
  border-radius: var(--sf-radius-md);
  border: 1px solid var(--sf-border-subtle);
  padding: 8px 11px;
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
  min-height: 34px;
  outline: none;
  background-color: rgba(255, 255, 255, 0.96);
}

.sf-editor-input:focus {
  border-color: rgba(30, 159, 255, 0.6);
  box-shadow: 0 0 0 1px rgba(30, 159, 255, 0.16);
}

.sf-editor-input--title {
  font-size: 18px;
  font-weight: 600;
}

.sf-editor-input--summary {
  min-height: 70px;
}

.sf-editor-input--body {
  min-height: 260px;
}

.sf-editor-select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, #9ca3af 50%),
    linear-gradient(135deg, #9ca3af 50%, transparent 50%);
  background-position: calc(100% - 14px) 50%, calc(100% - 9px) 50%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}

.sf-editor-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 4px;
}

.sf-editor-message {
  font-size: 12px;
  margin-top: 2px;
}

.sf-editor-message--error {
  color: #dc2626;
}

.sf-editor-message--success {
  color: #16a34a;
}

/* Responsive */

@media (max-width: 960px) {
  .sf-main-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .sf-main-right {
    order: -1;
  }

  .sf-header-inner {
    padding-inline: 16px;
  }

  .sf-article-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 768px) {
  .sf-header-inner {
    gap: 10px;
  }

  .sf-nav {
    display: none;
  }

  .sf-search {
    display: none;
  }

  .sf-main-inner {
    padding-inline: 14px;
  }

  .sf-toolbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .sf-article-layout {
    padding-inline: 14px;
  }

  .sf-editor-layout {
    padding-inline: 14px;
  }

  .sf-editor-row--inline {
    flex-direction: column;
  }
}