:root {
  --ink: #1c2a22;
  --ink-soft: #3d5146;
  --muted: #6b7d72;
  --line: rgba(28, 42, 34, 0.12);
  --moss: #2f6a4a;
  --moss-deep: #1f4d36;
  --moss-soft: rgba(47, 106, 74, 0.1);
  --leaf: #7ea886;
  --mist: #e7efe9;
  --fog: #f3f7f4;
  --sand: #f7f4ee;
  --surface: rgba(255, 255, 255, 0.72);
  --serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei UI", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --mono: ui-monospace, "Sarasa Mono SC", "Cascadia Code", "SF Mono", "JetBrains Mono", Consolas, monospace;
  --shadow: 0 18px 50px rgba(28, 42, 34, 0.08);
  --radius: 18px;
  --shell: min(1080px, calc(100% - 2.5rem));
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--fog);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--moss-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--moss);
}

img,
svg {
  display: block;
  max-width: 100%;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.bg-stage {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg-wash {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 15% 10%, rgba(126, 168, 134, 0.28), transparent 60%),
    radial-gradient(ellipse 60% 45% at 88% 18%, rgba(247, 244, 238, 0.9), transparent 55%),
    linear-gradient(165deg, #dfeadf 0%, #eef4f0 38%, #f7f4ee 72%, #e7efe9 100%);
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 85% 55% at 50% -10%, #000 25%, transparent 72%);
  opacity: 0.55;
}

.bg-leaf {
  position: absolute;
  border-radius: 50% 40% 55% 45%;
  filter: blur(40px);
  opacity: 0.35;
  animation: leaf-drift 16s ease-in-out infinite;
}

.bg-leaf-a {
  width: min(420px, 48vw);
  height: min(420px, 48vw);
  top: -6%;
  right: -4%;
  background: rgba(47, 106, 74, 0.28);
}

.bg-leaf-b {
  width: min(360px, 42vw);
  height: min(360px, 42vw);
  bottom: 8%;
  left: -8%;
  background: rgba(126, 168, 134, 0.3);
  animation-delay: -6s;
}

@keyframes leaf-drift {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-2%, 3%) rotate(4deg); }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(243, 247, 244, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 247, 244, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  color: var(--moss);
  display: grid;
  place-items: center;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--moss-deep);
}

.site-nav .nav-external {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  padding: 0.7rem 0.65rem;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.25s ease;
}

.site-main {
  padding-bottom: 4rem;
}

.hero {
  position: relative;
  min-height: calc(100vh - 4.25rem);
  display: grid;
  align-items: end;
  padding: 3.5rem 0 4rem;
  overflow: hidden;
}

.hero-visual {
  position: absolute;
  inset: 8% 0 auto auto;
  width: min(52vw, 560px);
  height: min(70vh, 640px);
  z-index: 0;
  opacity: 0;
  animation: rise-in 1s ease 0.15s forwards;
}

.hero-visual svg {
  width: 100%;
  height: 100%;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 34rem;
  opacity: 0;
  transform: translateY(18px);
  animation: rise-in 0.9s ease 0.05s forwards;
}

@keyframes rise-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-brand {
  font-family: var(--serif);
  font-size: clamp(2.8rem, 7vw, 4.6rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.15;
  margin: 0 0 1.1rem;
  color: var(--ink);
}

.hero-lead {
  margin: 0 0 0.7rem;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 600;
  color: var(--moss-deep);
}

.hero-desc {
  margin: 0 0 1.8rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 30rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--moss);
  color: #f7fbf8;
}

.btn-primary:hover {
  background: var(--moss-deep);
  color: #fff;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.55);
  border-color: var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--moss);
  color: var(--moss-deep);
}

.section {
  padding: 3.5rem 0 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
}

.section-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2rem);
  letter-spacing: 0.04em;
}

.section-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  white-space: nowrap;
}

.section-link:hover {
  color: var(--moss);
}

.note-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.note-item {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: 1.2rem;
  align-items: baseline;
  padding: 1.25rem 0.2rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 0.2s ease, padding 0.2s ease;
}

.note-item:hover {
  background: rgba(255, 255, 255, 0.45);
  padding-left: 0.55rem;
  padding-right: 0.55rem;
}

.note-date {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}

.note-body h3 {
  margin: 0 0 0.35rem;
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.45;
}

.note-body p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.note-meta {
  font-size: 0.82rem;
  color: var(--moss);
  font-weight: 500;
  white-space: nowrap;
}

.topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.topic-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
}

.topic-chip span {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.topic-chip:hover {
  border-color: var(--moss);
  color: var(--moss-deep);
}

.panel {
  margin-top: 2.5rem;
  padding: 1.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 0.6rem;
  font-family: var(--serif);
  font-size: 1.35rem;
}

.panel p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.page-hero {
  padding: 3rem 0 1.5rem;
}

.page-hero h1 {
  margin: 0 0 0.7rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.7rem);
  letter-spacing: 0.06em;
}

.page-hero p {
  margin: 0;
  max-width: 38rem;
  color: var(--ink-soft);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.5rem 0 0.5rem;
}

.filter-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
}

.filter-btn.is-active,
.filter-btn:hover {
  border-color: var(--moss);
  color: var(--moss-deep);
  background: var(--moss-soft);
}

.article {
  padding: 2.5rem 0 0;
}

.article-header {
  max-width: 42rem;
  margin-bottom: 2rem;
}

.article-header .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.2rem;
  margin-bottom: 0.9rem;
  font-size: 0.88rem;
  color: var(--muted);
  font-family: var(--mono);
}

.article-header h1 {
  margin: 0 0 0.9rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  line-height: 1.35;
  letter-spacing: 0.03em;
}

.article-header .excerpt {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.article-body {
  max-width: 42rem;
  font-size: 1.02rem;
}

.article-body h2 {
  margin: 2.2rem 0 0.8rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  letter-spacing: 0.03em;
}

.article-body p,
.article-body li {
  color: var(--ink-soft);
}

.article-body ul,
.article-body ol {
  padding-left: 1.2rem;
}

.article-body li + li {
  margin-top: 0.35rem;
}

.article-body code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: rgba(47, 106, 74, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.article-body pre {
  overflow-x: auto;
  padding: 1rem 1.1rem;
  border-radius: 12px;
  background: #203128;
  color: #e7f0ea;
  border: 1px solid rgba(28, 42, 34, 0.2);
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body blockquote {
  margin: 1.5rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--moss);
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink-soft);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.tag {
  font-size: 0.82rem;
  color: var(--moss-deep);
  background: var(--moss-soft);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  max-width: 42rem;
}

.article-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.article-nav a:hover {
  color: var(--moss);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.about-card {
  padding: 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.6);
}

.about-card h2 {
  margin: 0 0 0.7rem;
  font-family: var(--serif);
  font-size: 1.3rem;
}

.about-card p,
.about-card li {
  color: var(--ink-soft);
}

.about-card ul {
  margin: 0;
  padding-left: 1.1rem;
}

.about-card li + li {
  margin-top: 0.4rem;
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  background: rgba(231, 239, 233, 0.65);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
  padding: 2.4rem 0;
}

.footer-title {
  margin: 0 0 0.4rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}

.footer-desc,
.footer-meta p,
.copy {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--ink-soft);
}

.footer-links a:hover {
  color: var(--moss);
}

.icp {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.icp:hover {
  border-bottom-color: currentColor;
  color: var(--moss-deep);
}

.not-found {
  padding: 6rem 0;
  text-align: center;
}

.not-found h1 {
  font-family: var(--serif);
  font-size: 2.4rem;
  margin: 0 0 0.8rem;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 860px) {
  :root {
    --shell: min(1080px, calc(100% - 1.5rem));
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.4rem);
    right: 0.75rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    min-width: 12rem;
    padding: 0.6rem;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 0.55rem 0.7rem;
    border-radius: 10px;
  }

  .site-nav .nav-external {
    border-radius: 10px;
  }

  .header-inner {
    position: relative;
  }

  .hero {
    min-height: auto;
    padding-top: 2.2rem;
    align-items: start;
  }

  .hero-visual {
    position: relative;
    inset: auto;
    width: min(100%, 420px);
    height: 240px;
    margin: 0 0 1.5rem;
  }

  .note-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .note-meta {
    justify-self: start;
  }

  .about-grid,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .brand-sub {
    display: none;
  }
}