/* Lumen Weaver v4 — design tokens */
:root {
  /* === Surfaces (cool near-black, 4 layers) === */
  --bg-canvas:    #0b0d10;   /* page */
  --bg-panel:     #12151a;   /* main panel */
  --bg-panel-2:   #181c22;   /* nested panel */
  --bg-elev:      #1f242b;   /* popover/menu */
  --bg-input:     #0f1216;   /* inputs, textareas */

  /* === Borders === */
  --border-subtle:  rgba(255,255,255,0.05);
  --border-soft:    rgba(255,255,255,0.08);
  --border-strong:  rgba(255,255,255,0.14);
  --border-accent:  rgba(111,179,71,0.42);

  /* === Text === */
  --fg:          #eef1ef;
  --fg-strong:   #ffffff;
  --fg-muted:    #9aa3a0;
  --fg-subtle:   #6b7470;
  --fg-disabled: #4a4f52;

  /* === Brand accents (苔绿) === */
  --accent:        #6fb347;
  --accent-hi:     #9fdf67;
  --accent-dim:    #3a5f25;
  --accent-soft:   rgba(111,179,71,0.12);
  --accent-ring:   rgba(111,179,71,0.30);
  --accent-on:     #0a1104;  /* text on accent bg */

  /* === Functional === */
  --info:     oklch(0.72 0.09 230);
  --warn:     oklch(0.78 0.12 78);
  --danger:   oklch(0.70 0.16 25);
  --success:  #6fb347;

  /* status tint bgs */
  --info-bg:   oklch(0.72 0.09 230 / 0.12);
  --warn-bg:   oklch(0.78 0.12 78 / 0.12);
  --danger-bg: oklch(0.70 0.16 25 / 0.12);

  /* === Radii === */
  --r-xs: 3px;
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 10px;
  --r-xl: 14px;
  --r-2xl: 20px;
  --r-pill: 999px;

  /* === Shadow (soft, elevated) === */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 12px -4px rgba(0,0,0,0.5), 0 1px 0 rgba(255,255,255,0.03) inset;
  --shadow-lg:  0 12px 32px -12px rgba(0,0,0,0.6), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-xl:  0 24px 64px -16px rgba(0,0,0,0.7), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-pop: 0 0 0 1px rgba(0,0,0,0.4), 0 20px 48px -20px rgba(0,0,0,0.8);

  /* === Type === */
  --font-ui:    'Inter', 'Source Han Sans SC', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-cjk:   'Source Han Sans SC', 'Noto Sans SC', 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono:  'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --font-pixel: 'Press Start 2P', monospace;

  /* === Spacing scale (for reference) === */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-canvas);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'cv11', 'ss01', 'ss03';
}
body {
  min-height: 100vh;
  overflow-x: hidden;
}
button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}
button { cursor: pointer; border: none; background: none; padding: 0; }
input, textarea {
  background: none;
  border: none;
  outline: none;
}
textarea { resize: none; }

:focus-visible {
  outline: 2px solid var(--accent-ring);
  outline-offset: 1px;
}

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

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.14);
  background-clip: padding-box;
  border: 2px solid transparent;
}

/* Utility helpers */
.mono { font-family: var(--font-mono); font-feature-settings: 'tnum' 1; }
.pixel { font-family: var(--font-pixel); letter-spacing: 0.02em; }
.muted { color: var(--fg-muted); }
.subtle { color: var(--fg-subtle); }

/* Noise texture for panels */
.noise::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.05 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.5;
  pointer-events: none;
  mix-blend-mode: overlay;
}

/* Keyframes */
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideup { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes pulse-ring {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-ring); }
  50% { box-shadow: 0 0 0 4px transparent; }
}
@keyframes spin { to { transform: rotate(360deg); } }