/* ============================================================
   CodeBlock Mod — static landing page
   Design: dark "redstone terminal" theme, single accent,
   bento layout, GPU-only motion, WCAG-AA conscious.
   ============================================================ */

:root {
  --bg:        #0c0e13;
  --bg-soft:   #10131a;
  --surface:   #161a22;
  --surface-2: #1c212c;
  --border:    rgba(255,255,255,0.08);
  --border-2:  rgba(255,255,255,0.14);

  --text:      #e8eaf0;
  --muted:     #99a2b2;
  --faint:     #6b7280;

  --accent:    #e8554a;   /* redstone red */
  --accent-2:  #ff7a6f;
  --code-green:#7ee0a8;

  --radius:    18px;
  --radius-sm: 12px;
  --maxw:      1140px;

  --shadow:    0 18px 40px -20px rgba(0,0,0,0.7);
  --ease:      cubic-bezier(0.16, 1, 0.3, 1);

  --font-sans: "Outfit", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
code { font-family: var(--font-mono); }

::selection { background: rgba(232,85,74,0.32); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- shared bits ---------- */
.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 600;
  margin: 0 0 0.6rem;
}

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 92px 24px;
}
.section__head { max-width: 640px; margin-bottom: 44px; }
.section__title {
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.6rem;
  line-height: 1.12;
}
.section__sub { color: var(--muted); margin: 0; font-size: 1.02rem; }
.section__sub code, .section__title code { color: var(--code-green); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.96rem;
  padding: 0.78rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-2); transform: translateY(-2px); }
.btn--ghost { background: rgba(255,255,255,0.04); border-color: var(--border-2); color: var(--text); }
.btn--ghost:hover { background: rgba(255,255,255,0.09); transform: translateY(-2px); }
.btn--block { width: 100%; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(12,14,19,0.55);
  border-bottom: 1px solid transparent;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.nav.is-stuck {
  background: rgba(12,14,19,0.85);
  border-bottom-color: var(--border);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.85rem 24px;
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.05rem; }
.brand__icon { border-radius: 8px; }
.brand__mod { color: var(--accent-2); }
.nav__links { display: flex; gap: 1.6rem; margin-left: auto; font-size: 0.95rem; color: var(--muted); }
.nav__links a { transition: color 0.18s var(--ease); }
.nav__links a:hover { color: var(--text); }
.nav__cta { padding: 0.5rem 1.05rem; font-size: 0.9rem; }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; }
.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, #000 35%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, #000 35%, transparent 80%);
}
.hero__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 24px 110px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.04;
  margin: 0 0 1.1rem;
}
.hero__title .hl { color: var(--accent); }
.hero__lead { color: var(--muted); font-size: 1.08rem; max-width: 52ch; margin: 0 0 1.8rem; }
.hero__actions { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-bottom: 2.4rem; }
.hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 1.8rem;
  padding: 0;
  margin: 0;
}
.hero__stats li { display: flex; flex-direction: column; }
.stat__num { font-size: 1.5rem; font-weight: 700; color: var(--text); font-family: var(--font-mono); }
.stat__label { font-size: 0.8rem; color: var(--muted); }

.hero__visual { position: relative; display: flex; justify-content: center; align-items: center; }
.terminal {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.terminal__bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 0.9rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot--r { background: #ff5f57; }
.dot--y { background: #febc2e; }
.dot--g { background: #28c840; }
.terminal__file { margin-left: 0.6rem; font-size: 0.8rem; color: var(--muted); font-family: var(--font-mono); }
.terminal__body {
  margin: 0;
  padding: 1.2rem 1.3rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text);
  min-height: 168px;
  white-space: pre-wrap;
  word-break: break-word;
}
.caret {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  background: var(--accent);
  margin-left: 1px;
  vertical-align: text-bottom;
  animation: blink 1.05s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero__block {
  position: absolute;
  right: -18px;
  bottom: -34px;
  width: 132px;
  height: 132px;
  border-radius: 14px;
  border: 1px solid var(--border-2);
  box-shadow: var(--shadow);
  background: var(--bg-soft);
  animation: float 5.5s ease-in-out infinite;
}
@keyframes float { 50% { transform: translateY(-12px); } }

/* code colors */
.c-com { color: #6f7a8c; font-style: italic; }
.c-kw  { color: var(--accent-2); font-weight: 600; }
.c-fn  { color: var(--code-green); }
.c-num { color: #e8c07a; }

/* ---------- bento ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.5rem;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: var(--border-2); background: var(--surface-2); }
.card--wide { grid-column: span 2; }
.card--accent { border-color: rgba(232,85,74,0.4); background: linear-gradient(160deg, rgba(232,85,74,0.10), var(--surface)); }
.card__icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--accent-2);
  margin-bottom: 1rem;
}
.card--accent .card__icon { color: var(--accent-2); background: rgba(232,85,74,0.16); border-color: rgba(232,85,74,0.4); }
.card h3 { margin: 0 0 0.5rem; font-size: 1.15rem; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 0.96rem; }
.card code, .card p code { color: var(--code-green); font-family: var(--font-mono); font-size: 0.88em; }

/* ---------- steps ---------- */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  counter-reset: step;
}
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  position: relative;
}
.step__no {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.step h3 { margin: 0.7rem 0 0.5rem; font-size: 1.2rem; }
.step p { margin: 0; color: var(--muted); font-size: 0.96rem; }
.step code, .step p code { color: var(--code-green); font-family: var(--font-mono); }

/* ---------- showcase ---------- */
.showcase {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.tabs { display: flex; flex-wrap: wrap; gap: 4px; padding: 0.7rem; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.tab {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}
.tab:hover { color: var(--text); }
.tab.is-active { color: #fff; background: rgba(232,85,74,0.18); border-color: rgba(232,85,74,0.45); }
.showcase__code {
  margin: 0;
  padding: 1.5rem 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
  white-space: pre-wrap;
  min-height: 190px;
}
.showcase__note { margin: 0; padding: 0 1.6rem 1.4rem; color: var(--muted); font-size: 0.9rem; }

/* ---------- downloads ---------- */
.downloads { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.dl {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.7rem 1.6rem;
}
.dl--feature { border-color: rgba(232,85,74,0.4); background: linear-gradient(165deg, rgba(232,85,74,0.08), var(--surface)); }
.dl__head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.dl__head h3 { margin: 0; font-size: 1.3rem; }
.tag {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--accent-2);
  border: 1px solid rgba(232,85,74,0.35);
  background: rgba(232,85,74,0.10);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}
.dl__meta { list-style: none; padding: 0; margin: 0 0 1.4rem; color: var(--muted); font-size: 0.92rem; display: grid; gap: 0.5rem; }
.dl__meta code { color: var(--code-green); font-family: var(--font-mono); font-size: 0.85em; word-break: break-all; }

.callout {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  margin-top: 22px;
  padding: 1.1rem 1.3rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 0.95rem;
}
.callout svg { color: var(--accent-2); flex: none; margin-top: 2px; }
.callout p { margin: 0; }
.callout code { color: var(--code-green); font-family: var(--font-mono); }

.ecj-links { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 0.4rem; }
.ecj-status { font-size: 0.86rem; line-height: 1.5; color: #b45309; background: #fff7ed; border: 1px solid #fed7aa; border-radius: 10px; padding: 10px 12px; margin: 0 0 14px; }
.ecj-status code { font-family: var(--font-mono); color: #9a3412; }
.ecj-status--ok { color: #15803d; background: #f0fdf4; border-color: #bbf7d0; }
.ecj-status--ok code { color: #166534; }
.companion .section__title { font-size: clamp(1.5rem, 3vw, 2.1rem); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); margin-top: 40px; }
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 24px;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}
.footer__brand { display: flex; align-items: center; gap: 0.55rem; font-weight: 700; }
.footer__copy { color: var(--muted); font-size: 0.9rem; margin: 0; }
.footer__links { display: flex; gap: 1.3rem; margin-left: auto; font-size: 0.92rem; color: var(--muted); }
.footer__links a:hover { color: var(--text); }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; padding-top: 64px; }
  .hero__visual { order: -1; }
  .hero__block { right: 4px; bottom: -20px; width: 104px; height: 104px; }
  .bento { grid-template-columns: 1fr 1fr; }
  .card--wide { grid-column: span 2; }
  .steps { grid-template-columns: 1fr; }
  .downloads { grid-template-columns: 1fr; }
  .nav__links { display: none; }
}
@media (max-width: 560px) {
  .bento { grid-template-columns: 1fr; }
  .card--wide { grid-column: span 1; }
  .hero__stats { grid-template-columns: repeat(2, auto); gap: 1.2rem; }
  .section { padding: 64px 18px; }
  .footer__links { margin-left: 0; width: 100%; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__block { animation: none; }
}

/* ---------- download 3D scroll experience ---------- */
.dl3d__stage { position: relative; }
.dl3d__canvas,
.dl3d__spacer,
.dl3d__progress,
.dl3d__hint { display: none; }

.dl-panel__tag {
  display: inline-block;
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--accent-2);
  border: 1px solid rgba(232,85,74,0.35);
  background: rgba(232,85,74,0.10);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.9rem;
}
.dl-panel h3 { margin: 0 0 0.5rem; font-size: 1.4rem; letter-spacing: -0.01em; }
.dl-panel p { margin: 0 0 1.3rem; color: var(--muted); font-size: 0.96rem; }

/* fallback grid (no JS / no WebGL) */
.dl3d:not(.is-3d) .dl-panels { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.dl3d:not(.is-3d) .dl-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.7rem 1.6rem;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.dl3d:not(.is-3d) .dl-panel:hover { transform: translateY(-4px); border-color: var(--border-2); background: var(--surface-2); }

/* 3D mode */
.dl3d.is-3d .dl3d__stage {
  position: sticky;
  top: 0;
  height: 100vh;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.dl3d.is-3d .dl3d__canvas {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.dl3d.is-3d .dl-panels {
  position: relative;
  z-index: 2;
  width: min(520px, 92vw);
  min-height: 330px;
}
.dl3d.is-3d .dl-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: rgba(16,19,26,0.74);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 2.2rem;
  opacity: 0;
  transform: translateY(26px) scale(0.985);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  pointer-events: none;
}
.dl3d.is-3d .dl-panel.is-active {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.dl3d.is-3d .dl3d__spacer { display: block; height: 300vh; }
.dl3d.is-3d .dl3d__progress {
  display: flex;
  gap: 10px;
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}
.dl3d.is-3d .dl3d__progress .dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.dl3d.is-3d .dl3d__progress .dot.is-active { background: var(--accent); transform: scale(1.35); }
.dl3d.is-3d .dl3d__hint {
  display: block;
  position: absolute;
  top: 26px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

@media (max-width: 560px) {
  .dl3d:not(.is-3d) .dl-panels { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .dl3d.is-3d .dl-panel { transition: opacity 0.3s linear; transform: none; }
}

/* ===== 版本徽标 & 历史版本 ===== */
.version-badge {
  display: inline-block;
  margin-left: 10px;
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(110, 168, 255, 0.14);
  color: #9cc0ff;
  border: 1px solid rgba(110, 168, 255, 0.3);
  vertical-align: middle;
}
.history__bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  color: var(--muted);
}
.version-select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-2);
  border-radius: 10px;
  padding: 9px 12px;
  font: inherit;
  font-size: 0.95rem;
  min-width: 220px;
}
.version-select:focus { outline: none; border-color: var(--accent); }
.version-files__head {
  color: var(--muted);
  margin: 0 0 14px;
  font-size: 0.95rem;
}
.version-file {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  background: var(--surface);
  margin-bottom: 10px;
}
.version-file span { font-weight: 600; color: var(--text); }