:root {
    --bg: #050608;
    --fg: #E0E0E0;
    --accent: #00D4FF;
    --accent-dim: rgba(0, 212, 255, 0.1);
    --warning: #FFC857;
    --warning-dim: rgba(255, 200, 87, 0.1);
    --danger: #FF4A4A;
    --success: #00FF9C;
    --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "Courier New", Courier, monospace;
}
* { box-sizing: border-box; }
body {
    margin: 0; padding: 0;
    background-color: var(--bg); color: var(--fg);
    font-family: var(--font-ui);
    display: flex; flex-direction: column;
    height: 100vh; overflow: hidden;
}
.app-header {
    padding: 15px; border-bottom: 2px solid var(--accent);
    background: linear-gradient(180deg, #111, var(--bg));
    text-align: center; flex-shrink: 0;
}
.app-header h1 { margin: 0; font-size: 1.5rem; letter-spacing: 2px; color: var(--accent); text-transform: uppercase; }
.subtitle { margin: 5px 0 0; font-size: 0.75rem; opacity: 0.7; font-family: var(--font-mono); text-transform: uppercase; }
.debrief-banner {
    padding: 12px 15px; background-color: #1a1a1a;
    border-bottom: 1px solid #333; font-size: 0.9rem;
    line-height: 1.4; flex-shrink: 0;
    transition: background-color 0.3s, color 0.3s;
}
.debrief-banner.status-green { background-color: rgba(0, 255, 156, 0.15); border-bottom: 1px solid var(--success); color: var(--success); }
.debrief-banner.status-yellow { background-color: rgba(255, 200, 87, 0.15); border-bottom: 1px solid var(--warning); color: var(--warning); }
.debrief-banner.hidden { display: none; }
#app { flex: 1; overflow-y: auto; padding: 20px; padding-bottom: 80px; }
.loading-state { text-align: center; margin-top: 50px; color: var(--accent); font-family: var(--font-mono); animation: blink 1.5s infinite; }
@keyframes blink { 50% { opacity: 0.5; } }
.checklist-item { margin-bottom: 25px; border: 1px solid #333; padding: 15px; border-radius: 4px; background: #0f1012; }
.question-text { font-size: 1.1rem; margin-bottom: 15px; font-weight: 600; }
.btn-group { display: flex; gap: 10px; margin-bottom: 10px; }
.btn-option {
    flex: 1; padding: 15px; font-size: 1.1rem;
    background: #1a1a1a; border: 1px solid #444;
    color: #888; border-radius: 4px; cursor: pointer;
    transition: all 0.2s; font-family: var(--font-mono); font-weight: bold;
}
.btn-option:active { transform: scale(0.98); }
.btn-option[data-value="yes"].selected { background-color: var(--accent-dim); border-color: var(--accent); color: var(--accent); box-shadow: 0 0 10px var(--accent-dim); }
.btn-option[data-value="no"].selected { background-color: var(--warning-dim); border-color: var(--warning); color: var(--warning); }
.hint-text { font-size: 0.85rem; color: #777; font-style: italic; margin-top: 8px; }
.diagram-menu { display: flex; flex-direction: column; gap: 15px; }
.diagram-btn { padding: 20px; background: #1a1a1a; border: 1px solid var(--accent); color: var(--accent); font-size: 1.2rem; text-transform: uppercase; font-family: var(--font-mono); cursor: pointer; }
.diagram-container { text-align: center; margin-top: 10px; }
.diagram-container img { max-width: 100%; border: 1px solid #333; background: #000; }
.diagram-disclaimer { color: var(--danger); font-size: 0.8rem; margin-top: 10px; border: 1px solid var(--danger); padding: 5px; display: inline-block; }
.bottom-nav {
    position: fixed; bottom: 0; left: 0; width: 100%;
    background: #000; border-top: 2px solid #333;
    display: flex; height: 70px;
}
.nav-btn {
    flex: 1; background: transparent; border: none;
    border-right: 1px solid #222; color: #666;
    font-size: 0.8rem; font-weight: bold;
    text-transform: uppercase; cursor: pointer; padding: 5px;
}
.nav-btn:last-child { border-right: none; }
.nav-btn.active { background: linear-gradient(0deg, var(--accent-dim), transparent); color: var(--accent); border-top: 3px solid var(--accent); }