:root {
  --sf-bg: #f5f7fb;
  --sf-card-bg: #ffffff;
  --sf-border-subtle: #e5e7f2;
  --sf-border-strong: #d2d6ea;
  --sf-text-main: #1f2430;
  --sf-text-sub: #6b7280;
  --sf-text-light: #9ca3af;
  --sf-primary: #1c9cff;
  --sf-primary-soft: rgba(28, 156, 255, 0.08);
  --sf-primary-strong: #0077ff;
  --sf-danger: #ff4d4f;
  --sf-success: #22c55e;
  --sf-warning: #f97316;
  --sf-radius-lg: 12px;
  --sf-radius-md: 10px;
  --sf-radius-sm: 6px;
  --sf-shadow-soft: 0 12px 30px rgba(15, 23, 42, 0.06);
  --sf-shadow-card: 0 18px 45px rgba(15, 23, 42, 0.08);
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui,
    -system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  background: radial-gradient(circle at top left, #e6f1ff 0, #f5f7fb 40%, #f5f7fb 100%);
  color: var(--sf-text-main);
}

body {
  min-height: 100vh;
}

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

button {
  font-family: inherit;
}

.sf-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶部导航 */
.sf-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(
      to bottom,
      rgba(245, 247, 251, 0.92),
      rgba(245, 247, 251, 0.86)
    );
  border-bottom: 1px solid rgba(210, 214, 234, 0.75);
}

.sf-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.sf-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-right: 12px;
}

.sf-logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: radial-gradient(circle at 20% 0, #ffffff 0, #1c9cff 55%, #0077ff 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  letter-spacing: 0.5px;
  font-size: 18px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.3);
}

.sf-logo-text {
  font-weight: 650;
  letter-spacing: 0.02em;
  font-size: 18px;
  color: #0f172a;
}

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

.sf-nav-item {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--sf-text-sub);
  position: relative;
  transition: background 0.18s ease, color 0.18s ease;
}

.sf-nav-item:hover {
  background: rgba(15, 23, 42, 0.04);
  color: #111827;
}

.sf-nav-item--active {
  color: #0f172a;
  font-weight: 600;
  background: var(--sf-primary-soft);
}

.sf-header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.sf-search-box {
  display: flex;
  align-items: center;
  border-radius: 999px;
  background: #ffffff;
  padding: 4px 12px;
  border: 1px solid rgba(210, 214, 234, 0.9);
  min-width: 220px;
  box-shadow: 0 7px 18px rgba(15, 23, 42, 0.04);
}

.sf-search-icon {
  font-size: 16px;
  color: var(--sf-text-light);
  margin-right: 6px;
}

.sf-search-input {
  border: none;
  outline: none;
  background: transparent;
  font-size: 13px;
  color: var(--sf-text-main);
  width: 100%;
}

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

.sf-btn {
  border: none;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.sf-btn--primary {
  background: linear-gradient(135deg, #1c9cff, #0077ff);
  color: #ffffff;
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.45);
}

.sf-btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.6);
}

.sf-btn--ghost {
  background: rgba(15, 23, 42, 0.02);
  color: var(--sf-text-main);
  border: 1px solid rgba(210, 214, 234, 0.9);
}

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

.sf-btn--large {
  padding: 8px 18px;
  font-size: 14px;
}

.sf-btn--block {
  width: 100%;
  justify-content: center;
}

/* 副导航 */
.sf-subnav {
  border-bottom: 1px solid rgba(210, 214, 234, 0.9);
  background: rgba(245, 247, 251, 0.96);
  backdrop-filter: blur(8px);
}

.sf-subnav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sf-subnav-left,
.sf-subnav-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sf-chip {
  border-radius: 999px;
  padding: 5px 14px;
  border: 1px solid transparent;
  font-size: 12px;
  background: transparent;
  color: var(--sf-text-sub);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: all 0.16s ease;
}

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

.sf-chip--active {
  background: #ffffff;
  border-color: rgba(210, 214, 234, 0.9);
  color: #0f172a;
  box-shadow: 0 7px 18px rgba(15, 23, 42, 0.05);
}

.sf-chip--ghost {
  border-color: rgba(210, 214, 234, 0.9);
  background: rgba(255, 255, 255, 0.92);
}

/* 主体布局 */
.sf-main {
  flex: 1 0 auto;
}

.sf-main-inner {
  max-width: 1120px;
  margin: 18px auto 32px;
  padding: 0 20px;
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(260px, 0.9fr);
  gap: 18px;
  align-items: flex-start;
}

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

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

/* 卡片通用 */
.sf-card {
  background: radial-gradient(circle at top left, #ffffff 0, #f9fafb 60%, #f1f5f9 100%);
  border-radius: var(--sf-radius-lg);
  border: 1px solid rgba(210, 214, 234, 0.9);
  box-shadow: var(--sf-shadow-soft);
  padding: 16px 18px 18px;
}

.sf-card--highlight {
  background: radial-gradient(circle at top left, #f0f7ff 0, #ffffff 40%, #f5f7fb 100%);
  box-shadow: var(--sf-shadow-card);
  position: relative;
  overflow: hidden;
}

.sf-card--highlight::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 0, rgba(129, 230, 217, 0.18), transparent 55%);
  pointer-events: none;
}

.sf-card-content {
  position: relative;
  z-index: 1;
}

.sf-card-label {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(28, 156, 255, 0.06);
  color: #0369a1;
  border: 1px solid rgba(56, 189, 248, 0.6);
  font-size: 11px;
  font-weight: 500;
}

.sf-card-title {
  margin: 10px 0 10px;
  font-size: 22px;
  line-height: 1.35;
  color: #0f172a;
}

.sf-card-desc {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--sf-text-sub);
}

.sf-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sf-card-heading {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
  color: #111827;
}

/* 文章列表 */
.sf-post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sf-post-item {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) 140px;
  gap: 14px;
  padding: 14px 14px 12px;
  background: rgba(255, 255, 255, 0.92);
  border-radius: var(--sf-radius-md);
  border: 1px solid rgba(229, 231, 235, 0.9);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
  transition: transform 0.16s ease, box-shadow 0.16s ease,
    border-color 0.16s ease, background 0.16s ease;
}

.sf-post-item:hover {
  transform: translateY(-2px);
  border-color: rgba(148, 163, 184, 0.9);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.1);
  background: #ffffff;
}

.sf-post-main {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sf-post-meta-top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-post-author {
  color: #4b5563;
}

.sf-post-time {
  color: var(--sf-text-light);
}

.sf-post-dot {
  color: #d1d5db;
}

.sf-post-tag-badge {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.08);
  color: #2563eb;
  border: 1px solid rgba(129, 140, 248, 0.4);
  font-size: 11px;
}

.sf-post-title {
  font-size: 16px;
  font-weight: 600;
  color: #0f172a;
  margin-top: 2px;
  transition: color 0.16s ease;
}

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

.sf-post-summary {
  margin: 2px 0 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--sf-text-sub);
}

.sf-post-meta-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 4px;
}

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

.sf-post-stats span {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.sf-post-stats i {
  font-size: 13px;
}

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

.sf-tag {
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.02);
  border: 1px solid rgba(209, 213, 219, 0.9);
  font-size: 11px;
  color: #4b5563;
  white-space: nowrap;
}

.sf-tag--large {
  font-size: 12px;
  padding: 4px 10px;
}

.sf-post-cover {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.sf-post-cover-thumb {
  width: 120px;
  height: 80px;
  border-radius: 16px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 10px 12px;
  color: #ffffff;
  font-weight: 600;
  letter-spacing: 0.12em;
  font-size: 14px;
  text-transform: uppercase;
  background-size: 200% 200%;
  box-shadow: 0 18px 35px rgba(15, 23, 42, 0.4);
}

.sf-post-cover-thumb--blue {
  background-image: linear-gradient(135deg, #2563eb, #22d3ee);
}

.sf-post-cover-thumb--green {
  background-image: linear-gradient(135deg, #16a34a, #22c55e);
}

.sf-post-cover-thumb--purple {
  background-image: linear-gradient(135deg, #6366f1, #a855f7);
}

.sf-post-cover-thumb--orange {
  background-image: linear-gradient(135deg, #f97316, #fb923c);
}

/* 右侧标签云 */
.sf-tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sf-tags-cloud .sf-tag {
  background: rgba(255, 255, 255, 0.85);
}

.sf-tags-cloud .sf-tag:hover {
  border-color: rgba(59, 130, 246, 0.5);
  color: #1d4ed8;
  background: rgba(239, 246, 255, 0.9);
}

/* 排行榜 */
.sf-ranking-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sf-ranking-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.sf-ranking-index {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 1px solid var(--sf-border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #6b7280;
}

.sf-ranking-index--top {
  border: none;
  background: linear-gradient(135deg, #1c9cff, #6366f1);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.5);
}

.sf-ranking-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sf-ranking-name {
  color: #111827;
}

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

/* App 卡片 */
.sf-card--app {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.sf-card-app-icon {
  width: 46px;
  height: 46px;
  border-radius: 18px;
  background: radial-gradient(circle at 30% 0, #ffffff 0, #0ea5e9 60%, #6366f1 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 22px;
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.65);
}

.sf-card-app-content .sf-card-heading {
  margin-bottom: 4px;
}

.sf-card-app-content .sf-card-desc {
  margin-bottom: 10px;
}

/* 页脚 */
.sf-footer {
  border-top: 1px solid rgba(210, 214, 234, 0.9);
  background: rgba(248, 250, 252, 0.96);
}

.sf-footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 20px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-footer-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.sf-footer-left a {
  color: var(--sf-text-sub);
}

.sf-footer-dot {
  color: #d1d5db;
}

.sf-footer-right {
  color: var(--sf-text-sub);
}

/* 文章详情页 */
.sf-article {
  background: radial-gradient(circle at top left, #ffffff 0, #f9fafb 55%, #eef2ff 100%);
  border-radius: var(--sf-radius-lg);
  border: 1px solid rgba(210, 214, 234, 0.9);
  box-shadow: var(--sf-shadow-card);
  padding: 18px 20px 22px;
}

.sf-article-breadcrumb {
  font-size: 12px;
  color: var(--sf-text-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.sf-article-breadcrumb a {
  color: #4b5563;
}

.sf-article-breadcrumb a:hover {
  color: var(--sf-primary-strong);
}

.sf-article-header {
  margin-bottom: 14px;
}

.sf-article-title {
  margin: 4px 0 8px;
  font-size: 22px;
  line-height: 1.4;
  color: #0f172a;
}

.sf-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  color: var(--sf-text-light);
}

.sf-article-meta i {
  font-size: 13px;
}

.sf-article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.sf-article-tag-main {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.08);
  color: #2563eb;
  border: 1px solid rgba(129, 140, 248, 0.4);
  font-size: 11px;
}

.sf-article-body {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.9;
  color: #1f2933;
}

.sf-article-body p {
  margin: 0 0 12px;
}

.sf-article-body h2 {
  margin: 16px 0 8px;
  font-size: 17px;
  color: #111827;
}

.sf-article-body h3 {
  margin: 14px 0 6px;
  font-size: 15px;
  color: #111827;
}

.sf-article-body ul,
.sf-article-body ol {
  padding-left: 20px;
  margin: 6px 0 10px;
}

.sf-article-body li {
  margin-bottom: 4px;
}

.sf-article-body code {
  padding: 2px 5px;
  border-radius: 4px;
  background: rgba(15, 23, 42, 0.04);
  font-size: 12px;
}

.sf-article-body pre {
  background: #0b1120;
  color: #e5e7eb;
  padding: 10px 12px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 12px;
  line-height: 1.6;
  margin: 8px 0 12px;
}

.sf-article-body blockquote {
  margin: 10px 0;
  padding: 8px 12px;
  border-left: 3px solid rgba(59, 130, 246, 0.6);
  background: rgba(239, 246, 255, 0.85);
  border-radius: 0 10px 10px 0;
  color: #1e293b;
  font-size: 13px;
}

.sf-article-footer {
  margin-top: 16px;
  border-top: 1px dashed rgba(209, 213, 219, 0.9);
  padding-top: 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

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

.sf-article-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--sf-text-light);
}

.sf-article-actions span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.sf-article-actions i {
  font-size: 14px;
}

.sf-article-empty {
  font-size: 13px;
  color: var(--sf-text-light);
}

/* 写作页编辑器 */
.sf-editor {
  background: radial-gradient(circle at top left, #f0f9ff 0, #ffffff 45%, #eef2ff 100%);
}

.sf-editor-tip {
  margin: 0;
  font-size: 13px;
  color: var(--sf-text-sub);
}

.sf-editor-form {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.sf-editor-field label {
  font-size: 13px;
  color: #111827;
}

.sf-editor-field input,
.sf-editor-field textarea {
  border-radius: 10px;
  border: 1px solid rgba(209, 213, 219, 0.9);
  padding: 7px 10px;
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  background: rgba(255, 255, 255, 0.96);
  transition: border-color 0.16s ease, box-shadow 0.16s ease,
    background 0.16s ease;
}

.sf-editor-field textarea {
  line-height: 1.6;
}

.sf-editor-field input:focus,
.sf-editor-field textarea:focus {
  border-color: rgba(59, 130, 246, 0.8);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.3);
  background: #ffffff;
}

.sf-editor-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.sf-editor-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

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

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

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

/* 响应式 */
@media (max-width: 960px) {
  .sf-header-inner {
    flex-wrap: wrap;
  }

  .sf-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    margin-left: 46px;
  }

  .sf-main-inner {
    grid-template-columns: minmax(0, 1.7fr) minmax(260px, 0.9fr);
  }
}

@media (max-width: 768px) {
  .sf-header-inner {
    padding-inline: 14px;
  }

  .sf-subnav-inner {
    padding-inline: 14px;
    flex-direction: column;
    align-items: flex-start;
  }

  .sf-main-inner {
    margin-top: 14px;
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .sf-post-cover {
    justify-content: flex-start;
  }

  .sf-footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .sf-header-inner {
    gap: 10px;
  }

  .sf-header-right {
    width: 100%;
  }

  .sf-search-box {
    flex: 1;
    min-width: 0;
  }

  .sf-main-inner {
    padding-inline: 12px;
  }

  .sf-card {
    padding-inline: 14px;
  }

  .sf-card-title {
    font-size: 19px;
  }

  .sf-post-meta-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}