/* ============================================================
   喵箱代码 · moziyou.icu
   深色单页站点样式。无外部依赖、无网络字体。
   ============================================================ */

/* ---------- tokens ---------- */
:root {
  --bg:        #0A0A0C;
  --bg-soft:   #0D0D11;
  --surface:   #121216;
  --surface-2: #17171D;
  --line:      rgba(255, 255, 255, 0.08);
  --line-2:    rgba(255, 255, 255, 0.14);
  --text:      #F2F3F5;
  --muted:     #9A9AA6;
  --dim:       #7E7E8C;
  --accent:    #8B7CFF;
  --accent-2:  #5AD1C7;
  --accent-dim: rgba(139, 124, 255, 0.12);
  --radius:    16px;
  --radius-lg: 22px;
  --wrap:      1120px;
  --ease:      cubic-bezier(0.22, 0.61, 0.36, 1);

  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC",
          system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "JetBrains Mono", "Cascadia Code", "SFMono-Regular",
          Consolas, "Liberation Mono", monospace;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: -0.01em; font-weight: 700; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
li { list-style: none; }
a { color: inherit; text-decoration: none; }
b, strong { font-weight: 700; }
img, svg { display: block; max-width: 100%; }
::selection { background: rgba(139, 124, 255, 0.32); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--accent);
  color: #0A0A0C;
  border-radius: 10px;
  font-weight: 700;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease);
}
.nav.is-stuck {
  background: rgba(10, 10, 12, 0.78);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(145deg, rgba(139,124,255,.22), rgba(90,209,199,.12));
  border: 1px solid var(--line-2);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.brand__text { display: flex; flex-direction: column; font-weight: 700; font-size: 15px; line-height: 1.2; }
.brand__sub {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--dim);
  letter-spacing: .04em;
}
.nav__links { display: flex; gap: 4px; }
.nav__links a {
  position: relative;
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 14px;
  color: var(--muted);
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav__links a:hover { color: var(--text); background: rgba(255,255,255,.05); }
.nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 1px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.nav__toggle {
  display: none;
  margin-left: auto;
  width: 40px; height: 40px;
  padding: 0;
  background: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.nav__toggle span {
  display: block;
  width: 16px; height: 1.5px;
  background: var(--muted);
  border-radius: 2px;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: clamp(64px, 11vw, 132px) 0 clamp(56px, 8vw, 96px);
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 780px;
  background:
    radial-gradient(560px 380px at 22% 26%, rgba(139, 124, 255, .20), transparent 70%),
    radial-gradient(520px 340px at 78% 8%, rgba(90, 209, 199, .12), transparent 72%);
  filter: blur(12px);
  pointer-events: none;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(900px 520px at 50% 0%, #000 10%, transparent 78%);
  -webkit-mask-image: radial-gradient(900px 520px at 50% 0%, #000 10%, transparent 78%);
  pointer-events: none;
}
.hero__inner { position: relative; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 14px 6px 11px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  background: rgba(255,255,255,.025);
}
.eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 3px rgba(90,209,199,.16);
}
.hero h1 {
  margin-top: 28px;
  font-size: clamp(2.3rem, 6.4vw, 4.15rem);
  font-weight: 800;
  letter-spacing: -0.032em;
  line-height: 1.14;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(96deg, var(--accent) 8%, var(--accent-2) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  margin-top: 26px;
  max-width: 45em;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  color: var(--muted);
  line-height: 1.85;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.hero__note {
  margin-top: 18px;
  max-width: 46em;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--dim);
}
.remember code {
  font-family: var(--mono);
  font-size: .9em;
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(255, 255, 255, .07);
  color: var(--muted);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .18s var(--ease), box-shadow .25s var(--ease),
              background .2s var(--ease), border-color .2s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: linear-gradient(135deg, #9B8DFF, #7A69F5);
  color: #0A0A0C;
  box-shadow: 0 10px 30px -12px rgba(139,124,255,.85);
}
.btn--primary:hover { box-shadow: 0 14px 38px -12px rgba(139,124,255,1); transform: translateY(-1px); }
.btn--ghost {
  border-color: var(--line-2);
  color: var(--text);
  background: rgba(255,255,255,.02);
}
.btn--ghost:hover { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.24); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(48px, 7vw, 76px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stats li {
  padding: 22px 20px;
  background: linear-gradient(180deg, rgba(18,18,22,.9), rgba(13,13,17,.9));
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stats b {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(96deg, #fff, #B9B2FF);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}
.stats span { font-size: 12.5px; color: var(--dim); letter-spacing: .02em; }

/* ---------- section shell ---------- */
.section { padding: clamp(64px, 9vw, 116px) 0; position: relative; }
.section--alt {
  background:
    radial-gradient(700px 400px at 80% 0%, rgba(139,124,255,.055), transparent 70%),
    var(--bg-soft);
  border-block: 1px solid var(--line);
}
.sec-head { max-width: 46em; margin-bottom: clamp(36px, 5vw, 56px); }
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.kicker--sm { font-size: 11px; margin-bottom: 10px; }
.sec-head h2 { font-size: clamp(1.6rem, 3.6vw, 2.35rem); letter-spacing: -0.025em; }
.sec-sub { margin-top: 16px; color: var(--muted); font-size: 1rem; line-height: 1.85; }

/* ---------- cards ---------- */
.card {
  position: relative;
  background: linear-gradient(180deg, rgba(23,23,29,.72), rgba(18,18,22,.72));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}
.card:hover { border-color: var(--line-2); }
.card h3 { font-size: 1.0625rem; letter-spacing: -0.01em; }
.card p { margin-top: 12px; color: var(--muted); font-size: .9375rem; line-height: 1.8; }

.prose-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.card--prose { padding: 28px 26px; }
.card--prose h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 1rem; color: #fff;
}
.card--prose h3::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(139,124,255,.14);
  flex-shrink: 0;
}

.remember {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 24px 28px;
  border-radius: var(--radius);
  border: 1px solid rgba(139,124,255,.28);
  background:
    radial-gradient(420px 160px at 0% 50%, rgba(139,124,255,.14), transparent 78%),
    rgba(19,18,27,.8);
}
.remember__tag {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--accent);
  padding: 5px 11px;
  border: 1px solid rgba(139,124,255,.34);
  border-radius: 999px;
  background: rgba(139,124,255,.09);
}
.remember p { font-size: 1.0625rem; font-weight: 600; color: #EFEEFF; }

/* ---------- map grid ---------- */
.map-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: 14px;
}
.card--dir { display: flex; flex-direction: column; padding: 22px 22px 18px; }
.card--dir:hover { transform: translateY(-2px); background: linear-gradient(180deg, rgba(28,28,36,.85), rgba(20,20,25,.85)); }
.dir-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.dir-top h3 { font-size: 1rem; }
.pill {
  flex-shrink: 0;
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 999px;
  color: var(--dim);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.03);
  letter-spacing: .02em;
}
.pill--accent { color: var(--accent); border-color: rgba(139,124,255,.3); background: var(--accent-dim); }
.card--dir p { flex: 1; font-size: .875rem; line-height: 1.72; }
.dir-foot {
  margin-top: 18px;
  padding-top: 13px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--dim);
  font-family: var(--mono);
}
.dir-foot b { color: var(--accent-2); font-size: 14px; }
.card--sum { border-color: rgba(139,124,255,.24); background: linear-gradient(180deg, rgba(30,27,45,.7), rgba(20,18,28,.7)); }

/* ---------- flow ---------- */
.flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(196px, 1fr));
  gap: 14px;
  counter-reset: flow;
}
.flow li {
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.018);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}
.flow li:hover { background: rgba(255,255,255,.04); border-color: var(--line-2); }
.flow__n {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: .1em;
  margin-bottom: 12px;
}
.flow h3 { font-size: .9375rem; }
.flow p { margin-top: 9px; font-size: .875rem; color: var(--muted); line-height: 1.72; }

.levels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  margin-top: 16px;
}
.card--level { padding: 28px; }
.card--level h3 { font-size: 1.125rem; }
.card--level-accent {
  border-color: rgba(90,209,199,.22);
  background:
    radial-gradient(420px 200px at 100% 0%, rgba(90,209,199,.10), transparent 75%),
    linear-gradient(180deg, rgba(22,25,29,.8), rgba(18,20,24,.8));
}
.card--level-accent .kicker { color: var(--accent-2); }

/* ---------- features ---------- */
.feat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 14px;
}
.card--feat { padding: 24px; }
.card--feat h3 { font-size: 1rem; display: flex; align-items: center; gap: 9px; }
.card--feat h3::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent-2);
  flex-shrink: 0;
}
.card--feat p { font-size: .875rem; }
.card--feat-wide {
  grid-column: 1 / -1;
  background:
    radial-gradient(560px 200px at 0% 0%, rgba(139,124,255,.12), transparent 72%),
    linear-gradient(180deg, rgba(24,23,33,.85), rgba(18,18,22,.85));
  border-color: rgba(139,124,255,.2);
}
@media (min-width: 760px) {
  .card--feat-wide { padding: 32px; }
  .card--feat-wide p { max-width: 62ch; font-size: .9375rem; }
}

/* ---------- compare ---------- */
.compare {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(14,14,18,.75);
}
.tabs {
  display: flex;
  gap: 4px;
  padding: 12px 14px 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  flex-shrink: 0;
  padding: 8px 15px;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  background: none;
  color: var(--dim);
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.tabs button:hover { color: var(--text); background: rgba(255,255,255,.04); }
.tabs button[aria-selected="true"] {
  color: var(--accent);
  background: rgba(139,124,255,.1);
  border-color: rgba(139,124,255,.24);
}
.code-panel { border-top: 1px solid var(--line); }
.code-panel__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 16px;
  background: rgba(255,255,255,.022);
  border-bottom: 1px solid var(--line);
}
.code-panel__file {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: .03em;
}
.copy {
  padding: 5px 12px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: rgba(255,255,255,.03);
  color: var(--muted);
  font-family: var(--font);
  font-size: 12px;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.copy:hover { color: var(--text); border-color: rgba(255,255,255,.28); }
.copy.is-done { color: var(--accent-2); border-color: rgba(90,209,199,.4); }
.code {
  margin: 0;
  padding: 22px 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: #DCDCE6;
  tab-size: 4;
}
.code code { font-family: inherit; white-space: pre; }
.code-note {
  padding: 15px 20px 18px;
  border-top: 1px solid var(--line);
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.78;
  background: rgba(139,124,255,.045);
}
.code-note::before {
  content: "读法";
  display: inline-block;
  margin-right: 9px;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
  color: var(--accent);
  border: 1px solid rgba(139,124,255,.32);
  vertical-align: 1px;
}

/* ---------- timeline ---------- */
.timeline { position: relative; padding-left: 30px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 10px; bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-2), var(--line), transparent);
}
.timeline li { position: relative; padding: 0 0 30px 8px; }
.timeline li:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute;
  left: -30px; top: 9px;
  width: 15px; height: 15px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: var(--bg-soft);
}
.timeline .is-done .tl-dot {
  border-color: rgba(90,209,199,.6);
  background: rgba(90,209,199,.16);
  box-shadow: 0 0 0 4px rgba(90,209,199,.08);
}
.timeline h3 { font-size: 1rem; }
.timeline .is-done h3 { color: #fff; }
.timeline li:not(.is-done) h3 { color: var(--muted); }
.timeline p { margin-top: 7px; color: var(--muted); font-size: .9rem; line-height: 1.8; max-width: 60ch; }
.timeline li.is-done p { color: var(--muted); }

/* ---------- about ---------- */
.about {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}
.about__text h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); margin-bottom: 20px; }
.about__text p { color: var(--muted); font-size: .975rem; line-height: 1.9; margin-bottom: 14px; max-width: 52ch; }
.about__sign { font-family: var(--mono); font-size: 13px !important; color: var(--dim) !important; letter-spacing: .04em; margin-top: 22px !important; }
.about__facts { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: rgba(255,255,255,.018); }
.about__facts dl > div {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 14px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}
.about__facts dl > div:last-child { border-bottom: none; }
.about__facts dt { font-size: 12.5px; color: var(--dim); font-family: var(--mono); letter-spacing: .03em; }
.about__facts dd { font-size: .875rem; color: var(--text); }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); background: var(--bg-soft); }
.foot__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 34px;
}
.foot__brand { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.foot__brand .brand__mark { width: 26px; height: 26px; font-size: 11px; border-radius: 8px; }
.foot__note { font-size: 13px; color: var(--dim); }
.foot__links { display: flex; gap: 6px 14px; flex-wrap: wrap; font-size: 12.5px; }
.foot__links a { color: var(--dim); transition: color .16s var(--ease); }
.foot__links a:hover { color: var(--accent); }
.foot__copy { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--dim); }

/* ---------- reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .about { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: absolute;
    top: calc(100% + 8px);
    right: 16px;
    left: 16px;
    flex-direction: column;
    gap: 2px;
    padding: 10px;
    border: 1px solid var(--line-2);
    border-radius: var(--radius);
    background: rgba(16, 16, 20, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 24px 50px -24px rgba(0,0,0,.9);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .nav__links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__links a { padding: 11px 14px; font-size: 15px; }
  .nav__links a.is-active::after { display: none; }
  .nav__links a.is-active { background: rgba(139,124,255,.11); color: var(--accent); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats li:nth-child(odd) { border-right: 1px solid var(--line); }
  .stats li:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .hero { padding-top: 48px; }
  .foot__copy { margin-left: 0; width: 100%; }
}
@media (max-width: 420px) {
  .wrap, .nav__inner { padding-inline: 18px; }
  .card { padding: 22px 20px; }
}