/* ==========================================================================
   万物解构 · 观察台 UI Kit — design tokens & base
   Version 1.0 · 2026-10-18
   Shared by every deconstruction page. Do not put page-specific layout here.
   ========================================================================== */

:root {
  color-scheme: light;

  /* type */
  --font-ui: "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  --font-serif: Georgia, "Times New Roman", "Songti SC", SimSun, serif;
  --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  /* surface */
  --bg: #eef1f5;
  --bg-glow: #f9fbfd;
  --surface: #ffffff;
  --surface-2: #f7f9fb;
  --paper: #f3f5f7;
  --ink: #243140;
  --ink-strong: #17222e;
  --muted: #6b788a;
  --faint: #8996a7;
  --line: #e2e7ee;
  --line-strong: #d2dbe6;

  /* accent — one accent for the whole series */
  --accent: #2f63c9;
  --accent-strong: #2456b4;
  --accent-soft: #eaf0fc;
  --accent-line: #c8d7f3;
  --hover: #f0f3f7;

  /* project signal (model, legend, rays) — never used for chrome */
  --domain: #aa3f56;
  --domain-soft: #f8ecef;
  --laser: #b97a55;
  --ok: #3f7a63;
  --warn: #b06a4a;

  /* translucent surfaces */
  --glass: rgba(255, 255, 255, 0.84);
  --glass-strong: rgba(255, 255, 255, 0.95);
  --panel-bg: rgba(255, 255, 255, 0.68);
  --panel-line: rgba(20, 30, 50, 0.08);
  --frame-bg: rgba(255, 255, 255, 0.55);
  --frame-line: rgba(20, 30, 50, 0.08);
  --header-bg: rgba(255, 255, 255, 0.72);
  --transport-bg: rgba(255, 255, 255, 0.78);
  --canvas-bg: #f3f5f7;
  --row-bg: #f8fafc;
  --scrim: rgba(28, 40, 60, 0.24);

  /* elevation */
  --shadow-sm: 0 1px 4px rgba(27, 46, 67, 0.06);
  --shadow-md: 0 10px 30px rgba(20, 35, 55, 0.10);
  --shadow-lg: 0 18px 50px rgba(20, 35, 55, 0.10);
  --header-shadow: 0 10px 28px rgba(20, 35, 55, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.6);

  /* primary action */
  --play-bg: #21354f;
  --play-ink: #ffffff;

  /* shape */
  --r-xl: 22px;
  --r-lg: 18px;
  --r-md: 12px;
  --r-sm: 8px;
  --r-pill: 999px;

  /* shell metrics */
  --header-h: 58px;
  --viewbar-h: 48px;
  --transport-h: 76px;
  --w-nav: 200px;
  --w-inspector: 304px;
  --gap: 10px;
  --shell-margin: 14px;
  --shell-margin-x: 16px;
  --body-pad: 10px 12px 12px;

  /* motion */
  --ease: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);
  --dur-fast: 160ms;
  --dur: 240ms;
  --dur-slow: 320ms;
}

body.dark {
  color-scheme: dark;
  --bg: #141416;
  --bg-glow: #1b1b1e;
  --surface: #1f1f22;
  --surface-2: #242427;
  --paper: #1b1b1e;
  --ink: #e6e7ea;
  --ink-strong: #f2f3f5;
  --muted: #a0a0a7;
  --faint: #85858d;
  --line: #333336;
  --line-strong: #3d3d41;

  --accent: #dedee4;
  --accent-strong: #f2f3f5;
  --accent-soft: #2c2c2e;
  --accent-line: #45454a;
  --hover: #2c2c2e;

  --domain: #c993a0;
  --domain-soft: #2c2427;
  --laser: #cf9271;
  --ok: #7fb39a;
  --warn: #cf9478;

  --glass: rgba(36, 36, 39, 0.86);
  --glass-strong: rgba(44, 44, 46, 0.96);
  --panel-bg: rgba(27, 27, 30, 0.68);
  --panel-line: rgba(255, 255, 255, 0.07);
  --frame-bg: rgba(27, 27, 30, 0.58);
  --frame-line: rgba(255, 255, 255, 0.06);
  --header-bg: rgba(21, 21, 23, 0.72);
  --transport-bg: rgba(21, 21, 23, 0.78);
  --canvas-bg: #1b1b1e;
  --row-bg: #1c1c1c;
  --scrim: rgba(0, 0, 0, 0.52);

  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 14px 40px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.5);
  --header-shadow: 0 8px 24px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.06);

  --play-bg: #dedee4;
  --play-ink: #1b1b1e;
}

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

html,
body {
  margin: 0;
  height: 100%;
}

html {
  overflow: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  overflow: hidden;
  font-family: var(--font-ui);
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink);
  background:
    radial-gradient(1200px 640px at 18% -12%, var(--bg-glow), transparent 62%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--dur) ease, color var(--dur) ease;
}

[hidden] {
  display: none !important;
}

button,
input,
select,
output {
  font: inherit;
  color: inherit;
}

button {
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color var(--dur-fast) ease,
    color var(--dur-fast) ease,
    border-color var(--dur-fast) ease,
    box-shadow var(--dur-fast) ease,
    opacity var(--dur-fast) ease,
    transform var(--dur-fast) var(--ease);
}

button:disabled {
  opacity: 0.35;
  cursor: default;
}

button:active:not(:disabled) {
  transform: scale(0.96);
}

input,
select {
  font-family: inherit;
}

select {
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--ink);
  padding: 5px 7px;
}

svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke: currentColor;
  stroke-width: 1.4;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

svg use {
  pointer-events: none;
}

canvas {
  display: block;
}

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

::selection {
  color: var(--ink-strong);
  background: var(--accent-soft);
}

/* focus is never removed, only restyled */
:where(button, a, input, select, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   utilities
   -------------------------------------------------------------------------- */
.icon-library,
.svg-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.eyebrow {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.tiny {
  font-size: 9px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.subtle {
  font-size: 10px;
  color: var(--faint);
}

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

.serif {
  font-family: var(--font-serif);
}

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

/* thin scrollbars, only where scrolling is intended */
.scroll,
.observation-list,
#system-list,
#phase-list,
.inspector,
.side-panel,
.dialog-body,
.document-body {
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.scroll::-webkit-scrollbar,
.observation-list::-webkit-scrollbar,
#system-list::-webkit-scrollbar,
#phase-list::-webkit-scrollbar,
.inspector::-webkit-scrollbar,
.side-panel::-webkit-scrollbar,
.dialog-body::-webkit-scrollbar,
.document-body::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.scroll::-webkit-scrollbar-thumb,
.observation-list::-webkit-scrollbar-thumb,
#system-list::-webkit-scrollbar-thumb,
#phase-list::-webkit-scrollbar-thumb,
.inspector::-webkit-scrollbar-thumb,
.side-panel::-webkit-scrollbar-thumb,
.dialog-body::-webkit-scrollbar-thumb,
.document-body::-webkit-scrollbar-thumb {
  border-radius: var(--r-pill);
  background: var(--line-strong);
}

.scroll::-webkit-scrollbar-track,
.observation-list::-webkit-scrollbar-track,
#system-list::-webkit-scrollbar-track,
#phase-list::-webkit-scrollbar-track,
.inspector::-webkit-scrollbar-track,
.side-panel::-webkit-scrollbar-track,
.dialog-body::-webkit-scrollbar-track,
.document-body::-webkit-scrollbar-track {
  background: transparent;
}

/* native range controls inherit the accent */
input[type="range"] {
  accent-color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}