/* FlowStory — Animated Flow Diagram Framework */

:root {
  /* Dark theme (default) */
  --fs-bg: #0d1117;
  --fs-bg-surface: #161b22;
  --fs-bg-active: #1a2332;
  --fs-border: #30363d;
  --fs-text: #c9d1d9;
  --fs-text-dim: #8b949e;
  --fs-text-muted: #484f58;
  --fs-text-bright: #fff;
  --fs-accent: #58a6ff;
  --fs-accent-hover: #58a6ff22;
  --fs-success: #3fb950;
  --fs-warn: #f0883e;
  --fs-error: #f85149;
  --fs-purple: #d2a8ff;

  /* Inspector line backgrounds */
  --fs-line-add-bg: #1a2e1a;
  --fs-line-add-color: #3fb950;
  --fs-line-del-bg: #2d1517;
  --fs-line-del-color: #f85149;
  --fs-line-highlight-bg: #1a2332;
  --fs-line-highlight-color: #58a6ff;
  --fs-line-plugin-bg: #d2a8ff22;
  --fs-line-plugin-color: #d2a8ff;

  /* Step hover */
  --fs-step-hover-bg: #58a6ff22;
  --fs-step-hover-color: #58a6ff;
  --fs-step-hover-border: #58a6ff;
}

body.light {
  --fs-bg: #fff;
  --fs-bg-surface: #f6f8fa;
  --fs-bg-active: #ddf4ff;
  --fs-border: #d0d7de;
  --fs-text: #24292f;
  --fs-text-dim: #656d76;
  --fs-text-muted: #b0b8c1;
  --fs-text-bright: #000;
  --fs-accent: #0969da;
  --fs-accent-hover: #ddf4ff88;
  --fs-success: #1a7f37;
  --fs-warn: #bf8700;
  --fs-error: #82071e;
  --fs-purple: #8250df;

  --fs-line-add-bg: #dafbe1;
  --fs-line-add-color: #116329;
  --fs-line-del-bg: #ffebe9;
  --fs-line-del-color: #82071e;
  --fs-line-highlight-bg: #ddf4ff;
  --fs-line-highlight-color: #0969da;
  --fs-line-plugin-bg: #8250df15;
  --fs-line-plugin-color: #8250df;

  --fs-step-hover-bg: #ddf4ff88;
  --fs-step-hover-color: #0969da;
  --fs-step-hover-border: #0969da;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--fs-bg);
  color: var(--fs-text);
  overflow: hidden;
  transition: background .3s, color .3s;
}

/* === Right Panel === */
.fs-panel {
  position: fixed; top: 0; right: 0; width: 380px; height: 100vh; z-index: 100;
  display: flex; flex-direction: column;
  background: var(--fs-bg-surface);
  border-left: 1px solid var(--fs-border);
  overflow: hidden;
  transition: background .3s, border-color .3s;
}

/* Flow control bar */
.fs-flow-bar {
  padding: 12px 16px;
  border-bottom: 1px solid var(--fs-border);
  flex-shrink: 0;
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
}

.fs-flow-bar select {
  flex: 1; padding: 7px 10px;
  border: 1px solid var(--fs-border); border-radius: 6px;
  background: var(--fs-bg); color: var(--fs-text);
  font-size: 13px; font-family: inherit; cursor: pointer;
}

.fs-flow-bar button {
  padding: 7px 14px;
  border: 1px solid var(--fs-border); border-radius: 6px;
  background: var(--fs-bg-surface); color: var(--fs-text);
  cursor: pointer; font-size: 13px; font-family: inherit;
  transition: all .15s;
}
.fs-flow-bar button:hover { border-color: var(--fs-accent); }
.fs-flow-bar .fs-start { border-color: var(--fs-success); color: var(--fs-success); min-width: 90px; }
.fs-flow-bar .fs-reset { border-color: var(--fs-warn); color: var(--fs-warn); }

/* === Steps Section === */
.fs-steps {
  padding: 10px 16px;
  border-bottom: 1px solid var(--fs-border);
  flex: 2; overflow-y: auto;
}

.fs-steps-title { font-weight: 700; margin-bottom: 6px; font-size: 14px; }

.fs-step {
  margin: 2px 0; color: var(--fs-text-muted);
  display: flex; align-items: flex-start; gap: 6px;
  font-size: 12px; line-height: 1.4;
  cursor: pointer; padding: 3px 4px; border-radius: 4px;
  transition: all .2s;
}

.fs-step:hover {
  background: var(--fs-step-hover-bg);
  color: var(--fs-step-hover-color);
  transform: translateX(4px);
  border-left: 2px solid var(--fs-step-hover-border);
  padding-left: 6px;
}

.fs-step-mark { flex-shrink: 0; width: 16px; text-align: center; font-size: 13px; }
.fs-step-mark::before { content: '\25CB'; }
.fs-step.pending { color: var(--fs-text-muted); }
.fs-step.active { color: var(--fs-accent); }
.fs-step.active .fs-step-mark::before { content: '\25CF'; }
.fs-step.done { color: var(--fs-success); }
.fs-step.done .fs-step-mark::before { content: '\2713'; }

/* === Inspector Section === */
.fs-inspector {
  flex: 3; overflow-y: auto; padding: 10px 16px;
  font-family: 'SF Mono', Menlo, Consolas, monospace; font-size: 11px;
}

.fs-inspector-title {
  font-weight: 700; font-size: 14px; margin-bottom: 6px;
  font-family: -apple-system, sans-serif; flex-shrink: 0;
  padding: 0 0 6px; border-bottom: 1px solid var(--fs-border);
}

.fs-inspector-section {
  margin: 6px 0 2px; font-weight: 600;
  color: var(--fs-accent); font-size: 12px;
  font-family: -apple-system, sans-serif;
}

.fs-inspector-line {
  margin: 1px 0; padding: 2px 6px; border-radius: 3px;
  white-space: pre; line-height: 1.6; transition: all .4s;
}
.fs-inspector-line.add {
  background: var(--fs-line-add-bg); color: var(--fs-line-add-color);
  border-left: 3px solid var(--fs-line-add-color);
}
.fs-inspector-line.del {
  background: var(--fs-line-del-bg); color: var(--fs-line-del-color);
  text-decoration: line-through; opacity: .7;
  border-left: 3px solid var(--fs-line-del-color);
}
.fs-inspector-line.keep {
  color: var(--fs-text-dim); border-left: 3px solid transparent;
}
.fs-inspector-line.err {
  background: var(--fs-line-del-bg); color: var(--fs-line-del-color);
  border-left: 3px solid var(--fs-line-del-color); font-weight: 600;
}
.fs-inspector-line.highlight {
  background: var(--fs-line-highlight-bg); color: var(--fs-line-highlight-color);
  border-left: 3px solid var(--fs-line-highlight-color);
  animation: fs-pulse .8s;
}

@keyframes fs-pulse { 0% { opacity: .3; } 50% { opacity: 1; } 100% { opacity: 1; } }

.fs-inspector-plugin {
  margin: 8px 0 4px; padding: 4px 8px;
  background: var(--fs-line-plugin-bg); border-radius: 4px;
  color: var(--fs-line-plugin-color); font-weight: 600;
  font-size: 12px; font-family: -apple-system, sans-serif;
}

/* === Theme Toggle === */
.fs-theme-toggle {
  position: fixed; top: 16px; right: 396px; z-index: 200;
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--fs-border);
  background: var(--fs-bg-surface); color: var(--fs-text);
  cursor: pointer; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  transition: all .15s;
}

/* === Branding === */
.fs-brand {
  position: fixed; top: 10px; left: 16px; z-index: 200;
  display: flex; align-items: center; gap: 10px;
  pointer-events: none;
}
.fs-brand img { height: 30px; }
.fs-brand span {
  font-size: 20px; font-weight: 700; color: var(--fs-text-bright);
  letter-spacing: -0.3px;
  font-family: 'Red Hat Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* === Title === */
.fs-title {
  position: fixed; top: 14px; left: 0; right: 380px; z-index: 200;
  text-align: center; font-size: 22px; font-weight: 700;
  background: linear-gradient(135deg, #58a6ff, #d2a8ff, #f0883e);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: -0.5px; pointer-events: none;
}

/* === Legend === */
.fs-legend {
  position: fixed; bottom: 16px; left: 16px; z-index: 100;
  padding: 10px 14px;
  background: var(--fs-bg-surface);
  border: 1px solid var(--fs-border);
  border-radius: 10px; font-size: 13px;
  transition: all .3s;
}
.fs-legend-title { font-weight: 600; margin-bottom: 5px; font-size: 14px; }
.fs-legend-item { display: flex; align-items: center; gap: 8px; margin: 4px 0; font-size: 13px; }
.fs-legend-dot { width: 11px; height: 11px; border-radius: 50%; }

/* === Scrollbar === */
.fs-steps::-webkit-scrollbar,
.fs-inspector::-webkit-scrollbar { width: 6px; }

.fs-steps::-webkit-scrollbar-track,
.fs-inspector::-webkit-scrollbar-track { background: transparent; }

.fs-steps::-webkit-scrollbar-thumb,
.fs-inspector::-webkit-scrollbar-thumb {
  background: var(--fs-border); border-radius: 3px;
}