:root {
  --void: #050806;
  --panel: #0a100c;
  --panel-2: #0f1712;
  --line: #1c2a20;
  --text: #dbe8de;
  --text-dim: #5c6e62;

  --term-green: #4dff9f;
  --amber: #ffb454;
  --risk: #ff5c72;
  --signal: #4f8cff;

  --font-display: 'JetBrains Mono', ui-monospace, monospace;
  --font-body: 'Manrope', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--void); color: var(--text); font-family: var(--font-body); }
body { display: flex; flex-direction: column; }

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

a { color: var(--term-green); }
code { font-family: var(--font-mono); background: var(--panel-2); padding: 2px 6px; border-radius: 4px; color: var(--amber); font-size: 0.88em; }

/* -------- CRT scanline texture, subtle -------- */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 500; pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,0.12) 0px, transparent 1px, transparent 2px);
  opacity: 0.35;
}

/* -------- boot sequence -------- */
#boot-sequence {
  display: none; position: fixed; inset: 0; z-index: 600; background: var(--void);
  font-family: var(--font-mono); color: var(--term-green); padding: 40px; font-size: 14px;
}
.boot-line { min-height: 1.6em; white-space: pre-wrap; }
.boot-line:empty::before { content: "\00a0"; }

/* -------- window chrome -------- */
.titlebar {
  display: flex; align-items: center; gap: 10px; padding: 10px 16px;
  background: var(--panel-2); border-bottom: 1px solid var(--line); flex-shrink: 0;
}
.titlebar-dots { display: flex; gap: 6px; }
.titlebar-dots span { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.titlebar-title { font-family: var(--font-mono); font-size: 12px; color: var(--text-dim); flex: 1; text-align: center; }
#sidebar-toggle { display: none; background: none; border: none; color: var(--term-green); font-size: 18px; cursor: pointer; }

#app-shell { display: none; flex: 1; min-height: 0; }

/* -------- directory sidebar -------- */
#directory-panel {
  width: 240px; flex-shrink: 0; background: var(--panel); border-right: 1px solid var(--line);
  padding: 20px 14px; overflow-y: auto; font-family: var(--font-mono);
}
.dir-heading { font-size: 11px; color: var(--text-dim); letter-spacing: 1px; margin-bottom: 10px; }
.dir-item {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  background: none; border: none; color: var(--text-dim); padding: 8px 8px; border-radius: 4px;
  font-family: var(--font-mono); font-size: 12.5px; cursor: pointer;
}
.dir-item:hover { background: var(--panel-2); color: var(--text); }
.dir-item.active { background: rgba(77,255,159,0.1); color: var(--term-green); }
.dir-check {
  width: 18px; height: 18px; border-radius: 4px; border: 1px solid var(--line); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 10px; color: var(--text-dim);
}
.dir-check.done { background: var(--term-green); border-color: var(--term-green); color: var(--void); }

.progress-block { margin-top: 24px; }
#progress-label { font-size: 10.5px; color: var(--text-dim); margin-bottom: 6px; }
.progress-track { height: 4px; background: var(--panel-2); border-radius: 2px; overflow: hidden; }
#progress-fill { height: 100%; width: 0; background: var(--term-green); transition: width 0.4s ease; }

.sidebar-tool-link {
  display: block; margin-top: 24px; padding: 12px; background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 6px; font-size: 11.5px; color: var(--text-dim); text-decoration: none;
}
.sidebar-tool-link:hover { border-color: var(--term-green); color: var(--term-green); }

/* -------- main viewport -------- */
#main-panel { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#viewport { flex: 1; overflow-y: auto; padding: 40px; }
.module-view, .home-view { max-width: 700px; margin: 0 auto; line-height: 1.7; }

.module-view h1, .home-view h1 { font-family: var(--font-display); color: #fff; font-size: clamp(24px, 4vw, 32px); }
.module-view h2 { font-family: var(--font-display); color: var(--term-green); font-size: 20px; margin: 36px 0 14px; padding-top: 8px; border-top: 1px solid var(--line); }
.module-view h2:first-of-type { border-top: none; margin-top: 0; }
.module-view h3 { font-family: var(--font-display); color: var(--amber); font-size: 16px; margin: 24px 0 10px; }
.subtitle { color: var(--text-dim); font-size: 16px; margin-bottom: 28px; }
.module-view p, .module-view li, .home-view p { color: var(--text); }
.module-view table { width: 100%; border-collapse: collapse; margin-bottom: 20px; font-size: 13.5px; }
.module-view th, .module-view td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); }
.module-view th { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-dim); text-transform: uppercase; }

.callout { border-radius: 6px; padding: 14px 16px; margin: 0 0 20px; border-left: 3px solid var(--line); background: var(--panel); }
.callout-label { font-family: var(--font-mono); font-weight: 700; font-size: 10.5px; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 6px; }
.callout p:last-child { margin-bottom: 0; }
.callout.tip { border-left-color: var(--signal); } .callout.tip .callout-label { color: var(--signal); }
.callout.warning { border-left-color: var(--amber); } .callout.warning .callout-label { color: var(--amber); }
.callout.risk { border-left-color: var(--risk); } .callout.risk .callout-label { color: var(--risk); }
.callout.success { border-left-color: var(--term-green); } .callout.success .callout-label { color: var(--term-green); }

.checklist { list-style: none; padding: 0; }
.checklist li { display: flex; gap: 10px; padding: 7px 0; border-bottom: 1px dotted var(--line); }
.checklist li::before { content: "\2610"; color: var(--term-green); }

.ascii-banner { font-family: var(--font-mono); color: var(--term-green); font-size: clamp(8px, 1.6vw, 13px); line-height: 1.3; margin-bottom: 24px; }
.home-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.btn-primary, .btn-ghost {
  font-family: var(--font-mono); font-weight: 700; font-size: 13px; padding: 11px 18px; border-radius: 6px;
  cursor: pointer; text-decoration: none; display: inline-block;
}
.btn-primary { background: var(--term-green); color: var(--void); border: none; }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--term-green); color: var(--term-green); }

.btn-complete {
  font-family: var(--font-mono); font-size: 12px; padding: 10px 16px; border-radius: 6px;
  border: 1px solid var(--signal); background: transparent; color: var(--signal); cursor: pointer; margin-top: 30px;
}
.btn-complete.done { border-color: var(--term-green); color: var(--term-green); }

.prevnext { display: flex; justify-content: space-between; gap: 10px; margin-top: 30px; padding-top: 16px; border-top: 1px solid var(--line); }
.prevnext-btn { font-family: var(--font-mono); font-size: 12px; background: var(--panel); border: 1px solid var(--line); color: var(--text-dim); padding: 10px 14px; border-radius: 6px; cursor: pointer; }
.prevnext-btn:hover { color: var(--term-green); border-color: var(--term-green); }

.not-found { font-family: var(--font-mono); color: var(--risk); padding: 40px; }

/* -------- command bar -------- */
#command-bar { border-top: 1px solid var(--line); background: var(--panel-2); padding: 12px 20px; flex-shrink: 0; }
#command-output { font-family: var(--font-mono); font-size: 12px; color: var(--term-green); margin-bottom: 8px; display: none; }
#command-output.show { display: block; }
.command-line { display: flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 13.5px; }
#command-context { color: var(--term-green); }
.command-prompt { color: var(--text-dim); }
#command-input { flex: 1; background: none; border: none; color: var(--text); font-family: var(--font-mono); font-size: 13.5px; outline: none; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--void); }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }

/* -------- responsive -------- */
@media (max-width: 860px) {
  #sidebar-toggle { display: block; }
  #directory-panel {
    position: fixed; left: 0; top: 45px; bottom: 0; z-index: 400; width: 240px;
    transform: translateX(-100%); transition: transform 0.25s ease; box-shadow: 0 0 40px rgba(0,0,0,0.6);
  }
  #directory-panel.open { transform: translateX(0); }
  #viewport { padding: 24px 18px; }
}