:root {
  --bg: #0d0d0d;
  --bg-soft: #151515;
  --panel: #111417;
  --panel-strong: #171b1f;
  --text: #b3ecff;
  --text-strong: #e7f8ff;
  --muted: #86aebc;
  --cyan: #66d9ef;
  --pink: #ff79c6;
  --pink-hot: #ff5555;
  --green: #50fa7b;
  --border: #00eaff44;
  --border-soft: #00eaff22;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

html[lang="zh-CN"] body {
  font-family:
    "Fira Code",
    "PingFang SC",
    "Microsoft YaHei",
    "Noto Sans CJK SC",
    "Noto Sans SC",
    "Source Han Sans SC",
    system-ui,
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Monaco,
    Consolas,
    "Liberation Mono",
    sans-serif;
  line-break: strict;
  word-break: normal;
}

body {
  margin: 0;
  background: linear-gradient(135deg, var(--bg), #1a1a1a);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  color: var(--text);
  font-family: "Fira Code", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 15px;
  line-height: 1.55;
}

main {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
}

@keyframes gradientShift {
  0% { background-position: 0 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

h1, h2, h3 {
  color: var(--cyan);
  text-shadow: 0 0 1px #00eaff, 0 0 3px #00eaff55;
}

h1, h2 {
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 0.3em;
}

h2 { margin-top: 0; }
h3 { margin-top: 1.35rem; }

a {
  color: var(--pink);
  text-decoration: none;
  transition: color 0.2s ease, text-shadow 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

a:hover {
  color: var(--pink-hot);
  text-shadow: 0 0 4px #ff555588;
}

p { margin: 0.75rem 0; }
ul { padding-left: 1.25rem; }
li + li { margin-top: 0.35rem; }

pre {
  overflow-x: auto;
  margin: 0;
  padding: 1rem;
  border-radius: 7px;
  background: #1a1a1a !important;
  color: var(--green) !important;
  box-shadow: 0 0 10px #00eaff22;
}

code {
  color: var(--green);
  font-family: inherit;
}

blockquote {
  margin: 1rem 0;
  padding: 0.65rem 1rem;
  border-left: 3px solid var(--pink);
  border-radius: 6px;
  background: #1c0e17;
  color: var(--text);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin: 0 0 1.4rem;
}

.site-title {
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--pink);
  font-size: clamp(1.75rem, 5vw, 2.7rem);
  line-height: 1.1;
  text-shadow: 0 0 2px #ff79c6, 0 0 8px #ff79c633;
}

.top-actions,
.language-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-button,
.lang-button {
  flex: 0 0 auto;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: #101313;
  box-shadow: 0 0 14px #00eaff18;
  color: var(--cyan);
  font-size: 0.82rem;
  font-weight: 700;
}

.lang-button {
  min-width: 2.6rem;
  padding-inline: 0.65rem;
  text-align: center;
}

.lang-button.active {
  border-color: #50fa7b88;
  background: #50fa7b10;
  color: var(--green);
  cursor: default;
}

.brand-button:hover,
.lang-button:hover {
  border-color: #00eaff88;
  box-shadow: 0 0 18px #00eaff33;
  color: var(--cyan);
}

.lang-button.active:hover {
  border-color: #50fa7b88;
  color: var(--green);
}

.content-section { margin-top: 2.8rem; }
.hero { padding: 0.85rem 0 0.3rem; }

.hero-grid,
.workbench-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(0, 1.35fr);
  gap: clamp(1.25rem, 3vw, 2.4rem);
  align-items: start;
}

.hero-primary,
.hero-secondary,
.workbench-copy {
  min-width: 0;
}

.hero-secondary {
  padding-top: 0.05rem;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--green);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero-hook {
  margin: 0.8rem 0 1rem;
  color: var(--text-strong);
  font-size: clamp(1.15rem, 2.25vw, 1.55rem);
  line-height: 1.35;
}

.hero-hook strong { color: var(--green); }

.status {
  display: inline-block;
  margin: 0.45rem 0 0.9rem;
  padding: 0.28rem 0.62rem;
  border: 1px solid #00eaff55;
  border-radius: 999px;
  background: #00eaff0d;
  color: var(--cyan);
  font-size: 0.8rem;
  font-weight: 700;
}

.hero-quote { margin-top: 1rem; }

.links,
.hero-actions {
  display: flex;
  gap: 0.6rem;
}

.links {
  flex-wrap: wrap;
  margin: 1.3rem 0 1.8rem;
}

.hero-actions {
  flex-wrap: nowrap;
}

.links a {
  display: inline-block;
  padding: 0.5rem 0.75rem;
  border: 1px solid #ff79c666;
  border-radius: 6px;
  background: #171717;
  font-weight: 700;
}

.hero-actions a {
  white-space: nowrap;
}

.links a:hover {
  border-color: #ff555599;
  box-shadow: 0 0 12px #ff555522;
}

.grid,
.architecture-grid,
.proof-grid,
.case-grid {
  display: grid;
  gap: 1rem;
}

.grid {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.case-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.case-grid { margin: 1rem 0; }

.card,
.architecture-card,
.proof-card,
.case-card,
.roadmap-panel,
.flow-panel,
.workbench-copy {
  border: 1px solid var(--border);
  border-radius: 9px;
  background: linear-gradient(145deg, var(--panel), var(--panel-strong));
  box-shadow: 0 8px 24px #00000033;
}

.card,
.architecture-card,
.proof-card,
.case-card,
.workbench-copy {
  min-width: 0;
  padding: 1rem;
}

.card h3,
.architecture-card h3,
.proof-card h3 {
  margin: 0.45rem 0 0.65rem;
  padding-bottom: 0.42rem;
  border-bottom: 1px solid var(--border-soft);
}

.card-label {
  color: var(--green);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-hook {
  margin-top: 0.95rem;
  color: var(--green);
  font-weight: 700;
}

.problem-grid .card:first-child,
.proof-now {
  border-color: #ff79c666;
  box-shadow: 0 0 18px #ff79c610, 0 8px 24px #00000033;
}

.section-hook,
.invariant,
.showcase-hook {
  color: var(--text-strong);
}

.flow-panel {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0.55rem;
}

.flow-panel pre {
  height: 100%;
  box-shadow: none;
}

.workbench-copy {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  justify-content: center;
}

.workbench-copy .section-hook {
  margin-top: 0;
  font-size: 1.03rem;
}

.workbench-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.invariant {
  margin-top: 1.1rem;
  text-align: center;
}

.invariant strong { color: var(--green); }

.roadmap-panel {
  padding: 1rem 1.1rem;
  border-color: #ff79c644;
}

.roadmap-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.roadmap-status {
  margin: 0;
  border-color: #ff79c666;
  background: #ff79c60d;
  color: var(--pink);
}

.case-card p {
  margin-bottom: 0;
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.quiet {
  color: var(--muted);
  font-size: 0.87rem;
}

.showcase-hook {
  margin-top: 1.05rem;
  color: var(--green);
  text-align: center;
}

.proof-card ul { margin-bottom: 0; }

.site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-soft);
  color: var(--muted);
  text-align: center;
  font-size: 0.84rem;
}

.site-footer strong { color: var(--cyan); }

.footer-motto {
  width: 100%;
  text-align: center;
}

::selection {
  background: var(--pink);
  color: var(--bg);
}

@media (max-width: 900px) {
  .hero-grid,
  .workbench-grid,
  .architecture-grid,
  .proof-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-actions {
    flex-wrap: wrap;
  }

  .case-card p { font-size: 0.92rem; }
}

@media (max-width: 640px) {
  main {
    width: min(100% - 1.25rem, 1180px);
    padding-top: 1rem;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.8rem;
  }

  .top-actions {
    width: 100%;
    justify-content: space-between;
  }

  .brand-button { margin-left: auto; }
  .hero { padding-top: 0.4rem; }

  .roadmap-heading {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body { animation: none; }
}