/* [ANCHOR: CSS-VARIABLES-THEME] */
:root {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --bg-input: #0b1120;
  --border: #334155;
  --border-focus: #38bdf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.15);
  
  /* 節點狀態群組色 */
  --c-material-bg: #1e3a8a33; --c-material-border: #3b82f6; --c-material-text: #93c5fd;
  --c-process-bg: #581c8733; --c-process-border: #a855f7; --c-process-text: #d8b4fe;
  --c-check-bg: #78350f33; --c-check-border: #f59e0b; --c-check-text: #fcd34d;
  --c-pack-bg: #064e3b33; --c-pack-border: #10b981; --c-pack-text: #6ee7b7;

  /* 暗色主題節點文字 (高對比亮白與亮灰) */
  --node-sub-text: #93c5fd;
  --node-desc-text: #cbd5e1;

  --status-pending: #f59e0b;
  --status-done: #10b981;
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #f8fafc;
  --border: #cbd5e1;
  --border-focus: #0284c7;
  --text-main: #0f172a;
  --text-muted: #475569;
  --accent: #0284c7;
  --accent-glow: rgba(2, 132, 199, 0.12);

  /* 淺色主題高對比群組色彩 */
  --c-material-bg: #f0f7ff; --c-material-border: #3b82f6; --c-material-text: #1e40af;
  --c-process-bg: #fbf7ff; --c-process-border: #9333ea; --c-process-text: #6b21a8;
  --c-check-bg: #fffdf5; --c-check-border: #d97706; --c-check-text: #92400e;
  --c-pack-bg: #f2fcf5; --c-pack-border: #16a34a; --c-pack-text: #166534;

  /* 淺色主題節點文字 (高對比深色) */
  --node-sub-text: #334155;
  --node-desc-text: #475569;
}

/* [ANCHOR: CSS-RESET-LAYOUT] */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans TC", sans-serif;
  background: var(--bg-main);
  color: var(--text-main);
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* [ANCHOR: CSS-NAVBAR] */
.nav-bar {
  height: 56px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  gap: 12px;
  z-index: 10;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  height: 26px;
  width: auto;
  object-fit: contain;
  display: block;
}

.nav-island {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 700;
  transition: all 0.2s;
}
.nav-island:hover {
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  transform: scale(1.08);
}

.brand-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-tag {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--c-material-bg);
  border: 1px solid var(--c-material-border);
  color: var(--c-material-text);
  font-weight: 600;
}

.nav-views {
  display: flex;
  gap: 6px;
  background: var(--bg-input);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.view-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}
.view-btn.active {
  background: var(--bg-card);
  color: var(--accent);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon {
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-main);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}
.btn-icon:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}
.btn-accent {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}
.btn-accent:hover {
  opacity: 0.9;
  background: var(--accent);
}

/* [ANCHOR: CSS-MAIN-GRID] */
.main-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 420px;
  overflow: hidden;
  position: relative;
  height: calc(100vh - 56px);
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 380px;
  }
}