:root {
  --bg: #f7f8fb;
  --bg-subtle: #eef1f7;
  --bg-inset: #e6eaf2;
  --fg: #101828;
  --fg-muted: #4b5563;
  --fg-subtle: #7b8494;
  --border: #d5dbe7;
  --border-strong: #b3bccd;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-muted: #e5edff;
  --accent-fg: #2563eb;
  --note-bg: #ddf4ff;
  --tip-bg: #dafbe1;
  --warning-bg: #fff1e5;
  --caution-bg: #ffebe9;
  --code-bg: #f6f8fa;
  --code-fg: #1f2328;
  --shadow: 0 16px 40px -30px rgba(15, 23, 42, 0.28);
  --radius: 12px;
  --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

html.dark {
  --bg: #0b1220;
  --bg-subtle: #131c30;
  --bg-inset: #101828;
  --fg: #eef2f8;
  --fg-muted: #9aa7bd;
  --fg-subtle: #6e7681;
  --border: #27334a;
  --border-strong: #3c4b6b;
  --accent: #4f7dff;
  --accent-hover: #6c92ff;
  --accent-muted: rgba(79, 125, 255, 0.16);
  --accent-fg: #6c92ff;
  --note-bg: rgba(56, 139, 253, 0.15);
  --tip-bg: rgba(46, 160, 67, 0.15);
  --warning-bg: rgba(187, 128, 9, 0.15);
  --caution-bg: rgba(248, 81, 73, 0.15);
  --code-bg: #161b22;
  --code-fg: #e6edf3;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.7;
}

a {
  color: var(--accent-fg);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  font: inherit;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.2em 0.4em;
  border-radius: 5px;
  background: var(--bg-inset);
}

.container {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-weight: 650;
}

.brand-avatar {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 50%;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--fg-muted);
  font-size: 14px;
  font-weight: 550;
}

.site-nav a:hover {
  background: var(--bg-subtle);
  color: var(--fg);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
}

.icon-button {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--fg-muted);
  cursor: pointer;
}

.icon-button svg {
  width: 18px;
  height: 18px;
}

.icon-button:hover {
  background: var(--bg-subtle);
  color: var(--fg);
}

.hero {
  padding: 72px 0 64px;
}

.hero-grid {
  display: grid;
  align-items: center;
  gap: 40px;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 18px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-subtle);
  color: var(--fg-muted);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.8rem, 8vw, 5.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero-copy {
  max-width: 620px;
  margin: 18px 0 0;
  color: var(--fg-muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 650;
}

.button:hover {
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  color: #fff;
}

.button-primary:hover {
  background: var(--accent-hover);
}

.button-secondary {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
}

.button-secondary:hover {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-visual img {
  width: min(300px, 78vw);
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 24px 70px -28px var(--accent);
}

.section {
  padding: 72px 0;
}

.section-alt {
  border-top: 1px solid var(--border);
  background: transparent;
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0 0 6px;
  font-size: 1.9rem;
  letter-spacing: -0.02em;
}

.section-heading p {
  margin: 0;
  color: var(--fg-muted);
}

.post-grid,
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .post-grid,
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .post-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.post-card,
.project-card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  min-height: 210px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  box-shadow: var(--shadow);
}

.post-card::before,
.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 52%, transparent), transparent 38%, transparent 62%, color-mix(in srgb, var(--accent) 28%, transparent));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0.72;
  pointer-events: none;
}

.post-card:hover::before,
.project-card:hover::before {
  opacity: 1;
}

.post-card:hover,
.project-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.post-card h3,
.project-card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  line-height: 1.4;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--fg-subtle);
  font-size: 12px;
}

.post-summary {
  flex: 1;
  margin: 0;
  color: var(--fg-muted);
  font-size: 14px;
}

.post-footer,
.project-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font-size: 13px;
  font-weight: 600;
}

.post-tag,
.project-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg-muted);
  font-size: 12px;
  font-weight: 550;
}

.state-card {
  grid-column: 1 / -1;
  padding: 28px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--fg-muted);
  text-align: center;
}

.about-panel {
  position: relative;
  isolation: isolate;
  display: grid;
  gap: 24px;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  box-shadow: var(--shadow);
}

.about-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 46%, transparent), transparent 40%, transparent 60%, color-mix(in srgb, var(--accent) 24%, transparent));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0.68;
  pointer-events: none;
}

@media (min-width: 760px) {
  .about-panel {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}

.about-panel h2 {
  margin: 0 0 10px;
  font-size: 1.9rem;
  letter-spacing: -0.02em;
}

.about-panel p {
  max-width: 640px;
  margin: 0 0 12px;
  color: var(--fg-muted);
}

.about-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-weight: 600;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--fg-subtle);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* 动态 SVG 图标与按钮 */
.button svg,
.about-links svg,
.post-footer svg,
.project-links svg,
.article-footer svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.about-links a,
.article-footer a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.post-footer a,
.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 页面滚动入场动画 */
@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero,
.section,
.site-footer {
  animation: rise-in 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* 主题切换时整体颜色过渡 */
html.theme-transition,
html.theme-transition *,
html.theme-transition *::before,
html.theme-transition *::after {
  transition:
    background-color 0.35s ease,
    border-color 0.35s ease,
    color 0.35s ease,
    box-shadow 0.35s ease !important;
}

/* 图片加载失败时回退为 GitHub 标识 */
img.brand-avatar,
.hero-visual img {
  background: var(--bg-subtle);
}

/* 侧边导航 */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 60;
  display: flex;
  width: 232px;
  flex-direction: column;
  gap: 28px;
  padding: 24px 18px;
  border-right: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(18px);
  transform: translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

body.sidebar-open .sidebar {
  transform: translateX(0);
}

.site-nav {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}

.site-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border-radius: 10px;
  color: var(--fg-muted);
  font-size: 14px;
  font-weight: 600;
}

.site-nav a svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.sidebar-actions {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  border: 0;
  background: rgba(2, 8, 23, 0.38);
}

body.sidebar-open .sidebar-backdrop {
  display: block;
}

.mobile-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
}

.mobile-header .brand span {
  font-size: 14px;
}

.menu-button {
  width: 40px;
  height: 40px;
}

/* 桌面端固定侧栏 */
@media (min-width: 980px) {
  .sidebar {
    transform: none;
  }

  .sidebar-backdrop,
  .mobile-header {
    display: none;
  }

  main,
  .site-footer {
    margin-left: 232px;
  }
}