:root {
  --ink: #0f1720;
  --ink-soft: #3a4654;
  --paper: #f7f4ef;
  --paper-2: #efe9df;
  --line: rgba(15, 23, 32, 0.12);
  --signal: #0d7a6f;
  --signal-deep: #08584f;
  --glow: #c8f2eb;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans: "DM Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, monospace;
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--glow), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(13, 122, 111, 0.08), transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
  background-attachment: fixed;
  font-family: var(--sans);
  line-height: 1.7;
  min-height: 100vh;
}

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

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

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(247, 244, 239, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 999px;
  background: var(--signal);
  box-shadow: 0 0 0 6px rgba(13, 122, 111, 0.12);
  animation: pulse 2.8s var(--ease) infinite;
}

.brand-name {
  font-size: 1.05rem;
}

.brand-sub {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.nav-links a:hover {
  color: var(--signal-deep);
}

.hero {
  position: relative;
  min-height: calc(100vh - 4rem);
  display: grid;
  align-content: center;
  padding: 4.5rem 0 5rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 8% auto auto 55%;
  width: min(42vw, 480px);
  height: min(42vw, 480px);
  border: 1px solid rgba(13, 122, 111, 0.25);
  border-radius: 40% 60% 55% 45% / 45% 40% 60% 55%;
  background:
    linear-gradient(145deg, rgba(13, 122, 111, 0.12), transparent 55%),
    repeating-linear-gradient(
      -18deg,
      transparent,
      transparent 10px,
      rgba(15, 23, 32, 0.035) 10px,
      rgba(15, 23, 32, 0.035) 11px
    );
  animation: morph 14s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero-kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-deep);
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: rise 0.9s var(--ease) 0.1s forwards;
}

.hero-title {
  margin: 0;
  max-width: 12ch;
  font-family: var(--serif);
  font-size: clamp(3rem, 8vw, 5.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  opacity: 0;
  animation: rise 1s var(--ease) 0.2s forwards;
}

.hero-desc {
  margin: 1.5rem 0 0;
  max-width: 36rem;
  font-size: 1.15rem;
  color: var(--ink-soft);
  opacity: 0;
  animation: rise 1s var(--ease) 0.35s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.25rem;
  opacity: 0;
  animation: rise 1s var(--ease) 0.5s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--signal-deep);
}

.btn-ghost {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.section {
  padding: 4.5rem 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 28rem;
}

.post-list {
  display: grid;
  gap: 1rem;
}

.post-item {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: 1.25rem;
  align-items: start;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
  transition: padding-left 0.3s var(--ease);
}

.post-item:last-child {
  border-bottom: 1px solid var(--line);
}

.post-item:hover {
  padding-left: 0.4rem;
}

.post-date {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding-top: 0.35rem;
}

.post-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.25rem;
  line-height: 1.35;
  font-family: var(--serif);
}

.post-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.post-tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--signal-deep);
  white-space: nowrap;
  padding-top: 0.45rem;
}

.about-block {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

.about-block h2 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

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

.about-panel {
  min-height: 280px;
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, rgba(13, 122, 111, 0.1), transparent 50%),
    rgba(255, 255, 255, 0.5);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
}

.about-panel::after {
  content: "JARVIS";
  position: absolute;
  right: -0.2rem;
  bottom: -0.6rem;
  font-family: var(--mono);
  font-size: clamp(3rem, 8vw, 5rem);
  letter-spacing: 0.08em;
  color: rgba(13, 122, 111, 0.12);
  font-weight: 700;
}

.stat-row {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.stat-row strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.6rem;
  line-height: 1.1;
}

.stat-row span {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 3rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Article page */
.article-page {
  padding: 3.5rem 0 5rem;
}

.article-meta {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.article-page h1 {
  margin: 0 0 1.5rem;
  max-width: 16ch;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.article-lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 42rem;
  margin-bottom: 2.5rem;
}

.prose {
  max-width: 42rem;
}

.prose h2 {
  margin: 2.4rem 0 0.9rem;
  font-family: var(--serif);
  font-size: 1.55rem;
}

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

.prose p {
  margin: 0 0 1.1rem;
}

.prose ul {
  padding-left: 1.2rem;
}

.prose blockquote {
  margin: 1.75rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 3px solid var(--signal);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.15rem;
}

.back-link {
  display: inline-flex;
  margin-bottom: 1.75rem;
  color: var(--signal-deep);
  font-weight: 600;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes morph {
  from {
    transform: rotate(0deg) scale(1);
  }
  to {
    transform: rotate(12deg) scale(1.06);
  }
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 6px rgba(13, 122, 111, 0.12);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(13, 122, 111, 0.05);
  }
}

@media (max-width: 820px) {
  .hero::before {
    inset: auto -10% 10% auto;
    opacity: 0.55;
  }

  .post-item {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .post-tag {
    padding-top: 0;
  }

  .about-block {
    grid-template-columns: 1fr;
  }

  .nav-links {
    gap: 0.85rem;
    font-size: 0.88rem;
  }
}