:root {
  --ink: #181916;
  --muted: #62685f;
  --paper: #fbfbf7;
  --surface: #ffffff;
  --line: #d9ded2;
  --green: #3f6f60;
  --rust: #a15c3f;
  --blue: #4d6684;
  --gold: #b08a3c;
  --shadow: 0 18px 48px rgba(24, 25, 22, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 251, 247, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.header-inner,
.section-inner,
.hero-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.mark {
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0;
  white-space: nowrap;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  flex-wrap: wrap;
}

.nav a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(63, 111, 96, 0.1);
}

.hero {
  position: relative;
  min-height: 68svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 78% 24%, rgba(176, 138, 60, 0.2), transparent 26%),
    linear-gradient(135deg, #f7f8f2 0%, #eef4ef 46%, #f7f3ee 100%);
}

.hero canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.72;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: 72px 0 86px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
  font-weight: 680;
  letter-spacing: 0;
}

h1 {
  max-width: 720px;
  font-size: clamp(38px, 7vw, 76px);
}

h2 {
  font-size: clamp(26px, 4vw, 42px);
}

h3 {
  font-size: 20px;
}

.lead {
  max-width: 660px;
  margin: 24px 0 0;
  color: #3e443b;
  font-size: 18px;
}

.hero-actions,
.page-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.button,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 6px;
  font-weight: 650;
}

.button {
  padding: 10px 16px;
  background: var(--ink);
  color: #fff;
  border: 1px solid var(--ink);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.58);
  color: var(--ink);
  border-color: var(--line);
}

.text-link {
  color: var(--green);
  min-height: auto;
}

.section {
  padding: 72px 0;
}

.section.compact {
  padding: 48px 0;
}

.band {
  background: #eef3ee;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-head p,
.page-intro p {
  max-width: 680px;
  margin: 10px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  min-height: 100%;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card p {
  margin: 12px 0 0;
  color: var(--muted);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 3px 8px;
  border-radius: 6px;
  background: #eef3ee;
  color: var(--green);
  font-size: 13px;
  font-weight: 650;
}

.tag.rust {
  background: #f4eee9;
  color: var(--rust);
}

.tag.blue {
  background: #edf1f5;
  color: var(--blue);
}

.timeline {
  display: grid;
  gap: 14px;
}

.entry {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.entry time {
  color: var(--muted);
  font-size: 14px;
}

.entry p {
  margin: 8px 0 0;
  color: var(--muted);
}

.page-hero {
  padding: 72px 0 52px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #f8faf6 0%, #eef4ef 100%);
}

.page-intro {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
}

.page-intro h1 {
  font-size: clamp(34px, 5vw, 58px);
}

.empty-state {
  padding: 34px;
  border: 1px dashed #b9c1b5;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.66);
}

.empty-state p {
  margin: 10px 0 0;
  color: var(--muted);
}

.lab-shell {
  min-height: calc(100svh - 64px);
  display: grid;
  grid-template-rows: auto 1fr;
  background: #080b0d;
  color: #f4f7f1;
}

.lab-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.lab-top h1 {
  font-size: 18px;
}

.lab-top p {
  margin: 2px 0 0;
  color: rgba(244, 247, 241, 0.66);
  font-size: 14px;
}

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

.lab-actions a,
.lab-actions button {
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: #f4f7f1;
  font: inherit;
  cursor: pointer;
}

.lab-canvas-wrap {
  position: relative;
  min-height: 520px;
}

#labCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.not-found {
  min-height: calc(100svh - 64px);
  display: grid;
  place-items: center;
  padding: 48px 16px;
  text-align: center;
}

.not-found p {
  max-width: 560px;
  margin: 18px auto 0;
  color: var(--muted);
}

.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 780px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
    gap: 10px;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: 72svh;
  }

  .hero canvas {
    opacity: 0.16;
  }

  .hero-inner {
    padding: 58px 0 70px;
  }

  .grid,
  .grid.two {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .entry {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .lab-top {
    align-items: flex-start;
    flex-direction: column;
  }

  .lab-canvas-wrap {
    min-height: 62svh;
  }
}

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