/* ============================================================
   棱镜 PRISM · reset + shell + background atmosphere
   ============================================================ */

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

* {
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font: var(--t-body) / 1.62 var(--font-sans);
  color: var(--text-1);
  background: var(--ink-900);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "tnum" 0;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

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

ul,
ol {
  list-style: none;
}

::selection {
  background: var(--accent-soft);
  color: var(--text-1);
}

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

/* scrollbars ------------------------------------------------------------- */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--glass-3) transparent;
}
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--glass-3);
  border: 3px solid transparent;
  background-clip: content-box;
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--glass-edge-hi);
  background-clip: content-box;
}

/* ============================================================ background */
.atmos {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 50% -10%, var(--ink-800) 0%, var(--ink-900) 62%),
    var(--ink-900);
}

.atmos__aurora {
  position: absolute;
  inset: -22%;
  opacity: var(--aurora-o);
  filter: blur(46px) saturate(128%);
  background:
    radial-gradient(38% 30% at 18% 22%, color-mix(in oklab, var(--accent) 62%, transparent) 0%, transparent 72%),
    radial-gradient(32% 26% at 78% 16%, rgba(167, 139, 250, 0.5) 0%, transparent 70%),
    radial-gradient(42% 34% at 68% 78%, rgba(45, 212, 191, 0.44) 0%, transparent 72%),
    radial-gradient(30% 26% at 26% 84%, rgba(251, 191, 36, 0.3) 0%, transparent 70%),
    radial-gradient(36% 30% at 92% 52%, rgba(251, 113, 133, 0.26) 0%, transparent 72%);
  animation: aurora-drift 46s var(--ease) infinite alternate;
  transition: opacity var(--d-slow) var(--ease);
  will-change: transform;
}

@keyframes aurora-drift {
  0% {
    transform: translate3d(-2.5%, -1.5%, 0) scale(1) rotate(0deg);
  }
  50% {
    transform: translate3d(2.5%, 1.5%, 0) scale(1.09) rotate(4deg);
  }
  100% {
    transform: translate3d(-1%, 2.5%, 0) scale(1.03) rotate(-3deg);
  }
}

.atmos__grid {
  position: absolute;
  inset: 0;
  opacity: var(--grid-o);
  background-image:
    linear-gradient(to right, currentColor 1px, transparent 1px),
    linear-gradient(to bottom, currentColor 1px, transparent 1px);
  background-size: 58px 58px;
  color: var(--text-1);
  mask-image: radial-gradient(115% 85% at 50% 8%, #000 12%, transparent 76%);
  -webkit-mask-image: radial-gradient(115% 85% at 50% 8%, #000 12%, transparent 76%);
}

.atmos__grain {
  position: absolute;
  inset: -200%;
  opacity: var(--grain-o);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 7s steps(6) infinite;
}

@keyframes grain-shift {
  0%   { transform: translate(0, 0); }
  20%  { transform: translate(-3%, 2%); }
  40%  { transform: translate(2%, -3%); }
  60%  { transform: translate(-2%, -2%); }
  80%  { transform: translate(3%, 1%); }
  100% { transform: translate(0, 0); }
}

.atmos__beacon {
  position: fixed;
  width: 620px;
  height: 620px;
  left: 0;
  top: 0;
  margin: -310px 0 0 -310px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
  background: radial-gradient(circle, color-mix(in oklab, var(--accent) 24%, transparent) 0%, transparent 68%);
  transition: background var(--d-slow) var(--ease);
  will-change: transform;
}

/* ============================================================ typography */
.display {
  font: var(--t-display) / 1.14 var(--font-serif);
  letter-spacing: -0.015em;
}

.h1 { font: var(--t-h1) / 1.24 var(--font-serif); letter-spacing: -0.01em; }
.h2 { font: var(--t-h2) / 1.32 var(--font-serif); }
.h3 { font: var(--t-h3) / 1.42 var(--font-sans); letter-spacing: -0.005em; }

.grad-text {
  background: linear-gradient(
    96deg,
    var(--text-1) 6%,
    color-mix(in oklab, var(--accent) 72%, var(--text-1)) 48%,
    color-mix(in oklab, var(--a-violet) 52%, var(--text-1)) 96%
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.label {
  font: var(--t-label) / 1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-3);
}

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.num  { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }

.muted { color: var(--text-2); }
.dim   { color: var(--text-3); }
.tiny  { font: var(--t-xs) / 1.5 var(--font-sans); color: var(--text-3); }

.accent { color: var(--accent); }

/* ============================================================ layout */
.shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  min-height: 100dvh;
}

.shell__main {
  min-width: 0;
  padding: var(--sp-6) var(--sp-6) var(--sp-8);
}

.wrap {
  max-width: var(--shell-max);
  margin: 0 auto;
  width: 100%;
}

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-5);
  flex-wrap: wrap;
  margin-bottom: var(--sp-6);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--glass-edge);
}

.page-head__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-2);
}

.page-head h1 { margin-bottom: 6px; }

.page-head__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.stack   { display: flex; flex-direction: column; }
.row     { display: flex; align-items: center; }
.roww    { display: flex; align-items: center; flex-wrap: wrap; }
.gap-1 { gap: var(--sp-1); } .gap-2 { gap: var(--sp-2); } .gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); } .gap-5 { gap: var(--sp-5); } .gap-6 { gap: var(--sp-6); }
.spacer  { flex: 1 1 auto; }
.hidden  { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ============================================================ rail nav */
.rail {
  position: sticky;
  top: 0;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-4) 0 var(--sp-4);
  z-index: 40;
  border-right: 1px solid var(--glass-edge);
  background: linear-gradient(180deg, var(--glass) 0%, transparent 34%, transparent 66%, var(--glass) 100%);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
}

.rail__brand {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: var(--sp-3);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, color-mix(in oklab, var(--accent) 30%, transparent), rgba(167, 139, 250, 0.16));
  box-shadow: var(--sh-md), inset 0 1px 0 var(--glass-edge-hi);
  color: #fff;
  font: 700 1.15rem/1 var(--font-serif);
  letter-spacing: -0.04em;
  transition: transform var(--d-mid) var(--ease-spring), box-shadow var(--d-mid) var(--ease);
}
.rail__brand:hover { transform: translateY(-2px) rotate(-4deg); }

.rail__nav {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 100%;
  padding: 0 10px;
  overflow-y: auto;
  flex: 1;
}

.rail__item {
  position: relative;
  display: grid;
  place-items: center;
  gap: 3px;
  width: 100%;
  padding: 9px 2px 7px;
  border-radius: var(--r-md);
  color: var(--text-3);
  transition: color var(--d-fast) var(--ease), background var(--d-fast) var(--ease);
}

.rail__item svg { width: 20px; height: 20px; }

.rail__item span {
  font: var(--t-label) / 1 var(--font-mono);
  letter-spacing: 0.04em;
  font-size: 0.5625rem;
  opacity: 0.85;
}

.rail__item::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 3px;
  height: 0;
  border-radius: 0 3px 3px 0;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
  transform: translateY(-50%);
  transition: height var(--d-mid) var(--ease-spring);
}

.rail__item:hover { color: var(--text-1); background: var(--glass); }
.rail__item:hover::before { height: 42%; }

.rail__item.is-active {
  color: var(--text-1);
  background: linear-gradient(90deg, var(--accent-soft), transparent 90%);
}
.rail__item.is-active::before { height: 62%; }
.rail__item.is-active svg { filter: drop-shadow(0 0 7px var(--accent)); }

.rail__foot { display: flex; flex-direction: column; gap: var(--sp-2); align-items: center; }

.rail__btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  color: var(--text-3);
  transition: all var(--d-fast) var(--ease);
}
.rail__btn:hover {
  color: var(--text-1);
  background: var(--glass-2);
  border-color: var(--glass-edge);
}
.rail__btn svg { width: 17px; height: 17px; }

/* ============================================================ topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin: calc(var(--sp-6) * -1) calc(var(--sp-6) * -1) var(--sp-5);
  padding: var(--sp-3) var(--sp-6);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  background: color-mix(in oklab, var(--ink-900) 72%, transparent);
  transition: border-color var(--d-mid) var(--ease), background var(--d-mid) var(--ease);
}
.topbar.is-stuck { border-bottom-color: var(--glass-edge); }

.crumb {
  display: flex;
  align-items: center;
  gap: 7px;
  font: var(--t-label) / 1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-3);
}
.crumb b { color: var(--text-1); font-weight: 500; }
.crumb i { font-style: normal; opacity: 0.4; }

.omni {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  height: 34px;
  padding: 0 6px 0 11px;
  min-width: 210px;
  border: 1px solid var(--glass-edge);
  border-radius: var(--r-pill);
  background: var(--field);
  color: var(--text-3);
  font-size: var(--t-sm);
  transition: all var(--d-fast) var(--ease);
}
.omni:hover { border-color: var(--glass-edge-hi); background: var(--glass-2); color: var(--text-2); }
.omni svg { width: 14px; height: 14px; }
.omni kbd {
  margin-left: auto;
  padding: 2px 6px;
  border: 1px solid var(--glass-edge);
  border-radius: var(--r-xs);
  background: var(--glass-2);
  font: 500 0.625rem/1.4 var(--font-mono);
  letter-spacing: 0.04em;
}

.live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px 4px 8px;
  border: 1px solid var(--glass-edge);
  border-radius: var(--r-pill);
  background: var(--glass);
  font: var(--t-label) / 1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
}
.live::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--a-jade);
  box-shadow: 0 0 0 0 var(--a-jade);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in oklab, var(--a-jade) 60%, transparent); }
  70%  { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* ============================================================ responsive */
@media (max-width: 900px) {
  :root { --rail-w: 0px; }

  .shell { grid-template-columns: 1fr; padding-bottom: 68px; }

  .rail {
    position: fixed;
    inset: auto 0 0 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    padding: 7px 8px calc(7px + env(safe-area-inset-bottom));
    border-right: none;
    border-top: 1px solid var(--glass-edge);
    background: color-mix(in oklab, var(--ink-900) 88%, transparent);
    z-index: 60;
  }
  .rail__brand,
  .rail__foot { display: none; }
  .rail__nav {
    flex-direction: row;
    justify-content: space-around;
    padding: 0;
    gap: 0;
    overflow-x: auto;
  }
  .rail__item { padding: 6px 8px 5px; min-width: 54px; }
  .rail__item::before {
    left: 50%;
    top: auto;
    bottom: -7px;
    width: 0;
    height: 3px !important;
    border-radius: 3px 3px 0 0;
    transform: translateX(-50%);
    transition: width var(--d-mid) var(--ease-spring);
  }
  .rail__item.is-active::before { width: 22px; }

  .shell__main { padding: var(--sp-4) var(--sp-4) var(--sp-6); }
  .topbar { margin: calc(var(--sp-4) * -1) calc(var(--sp-4) * -1) var(--sp-4); padding: var(--sp-3) var(--sp-4); }
  .omni { min-width: 0; }
  .omni span { display: none; }
  .omni kbd { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================ reveal */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--d-slow) var(--ease-out), transform var(--d-slow) var(--ease-out);
}
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}