/* ========== 樣式系統：KaiOS Studio ========== */
:root {
  /* 背景 - 深霧夜色，比純黑更柔和 */
  --bg-0: #0b0d12;
  --bg-1: #11141b;
  --bg-2: #161a23;
  --bg-3: #1d2230;
  --bg-4: #252b3b;
  --bg-glass: rgba(22, 26, 35, 0.72);

  /* 邊框 */
  --line-faint: #1a1e28;
  --line: #242a38;
  --line-strong: #353c4f;
  --line-bright: #4a5267;

  /* 文字 */
  --ink-0: #f4f5f8;
  --ink-1: #c7cad3;
  --ink-2: #8a8f9e;
  --ink-3: #5d6275;
  --ink-4: #3f4456;

  /* 主色：紅茶巴士橘調，更暖 */
  --kai: #e88565;
  --kai-bright: #f59879;
  --kai-deep: #c46647;
  --kai-glow: rgba(232, 133, 101, 0.18);
  --kai-tint: rgba(232, 133, 101, 0.08);

  /* Ruby */
  --ruby: #f06ea0;

  /* 表現分級 */
  --high: #5cd896;
  --high-glow: rgba(92, 216, 150, 0.16);
  --high-tint: rgba(92, 216, 150, 0.08);
  --normal: #8a8f9e;
  --low: #ff7a7a;
  --low-glow: rgba(255, 122, 122, 0.18);
  --low-tint: rgba(255, 122, 122, 0.08);

  /* 流程階段色 */
  --stage-inbox: #6c7186;
  --stage-selected: #62a4ff;
  --stage-shoot: #f0b35c;
  --stage-edit: #b78bff;
  --stage-live: #5cd896;

  /* 警示 */
  --warn: #f0b35c;
  --warn-glow: rgba(240, 179, 92, 0.18);
  --info: #62a4ff;
  --info-glow: rgba(98, 164, 255, 0.16);

  /* 字型 */
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --sans: 'Inter', 'Noto Sans TC', system-ui, -apple-system, sans-serif;
  --display: 'Inter', 'Noto Sans TC', system-ui, sans-serif;

  /* 動效 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg-0);
  color: var(--ink-0);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'cv11', 'ss01';
}

/* 背景：細微的網格紋理 + 暈光 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 800px 600px at 15% 0%, rgba(232, 133, 101, 0.06), transparent 60%),
    radial-gradient(ellipse 700px 500px at 85% 100%, rgba(98, 164, 255, 0.04), transparent 60%);
  z-index: 0;
}

#root { position: relative; z-index: 1; height: 100vh; width: 100vw; }

button, input, textarea {
  font-family: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}
button { cursor: pointer; }

::selection { background: var(--kai-glow); color: var(--ink-0); }

/* 滾動條 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 9px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--line-bright); background-clip: padding-box; border: 2px solid transparent; }

/* 動畫 keyframes */
@keyframes pulse-soft {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--kai-glow); }
  50% { box-shadow: 0 0 0 6px transparent; }
}
@keyframes slide-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slide-in-right {
  from { opacity: 0; transform: translateX(12px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}
@keyframes ripple {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* 工具類 */
.mono { font-family: var(--mono); font-feature-settings: 'tnum'; }
.dim { color: var(--ink-2); }
.faint { color: var(--ink-3); }

/* Glass 卡片 */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  border: 1px solid var(--line);
  border-radius: 10px;
}

/* hover 提升 */
.lift { transition: transform 0.15s var(--ease-out), border-color 0.15s, box-shadow 0.15s; }
.lift:hover { transform: translateY(-1px); border-color: var(--line-strong); }

/* 焦點 ring */
.focusable:focus-visible {
  outline: 2px solid var(--kai);
  outline-offset: 2px;
}

/* 骨架閃光 */
.skeleton {
  background: linear-gradient(90deg, var(--bg-2) 0%, var(--bg-3) 50%, var(--bg-2) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}

/* Tooltip */
[data-tip] { position: relative; }
[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  padding: 5px 8px;
  background: var(--bg-4);
  border: 1px solid var(--line-strong);
  color: var(--ink-1);
  font-size: 11px;
  font-family: var(--mono);
  white-space: nowrap;
  border-radius: 5px;
  z-index: 1000;
  pointer-events: none;
  animation: fade-in 0.15s var(--ease-out);
}