/* falling-coil lesson-specific styles. Extracted during theme polish Phase 4. */
.fc-page { padding-bottom: 0; }
    .ll-viewport { --ll-panel-w: 280px; }

    .fc-hero { padding: 0.4rem 0 1.3rem; }
    .fc-hero h1 { max-width: 30ch; margin-left: 0; font-size: clamp(1.55rem,3.5vw,2.3rem); }
    .fc-meta { display: flex; flex-wrap: wrap; gap: 0.4rem 0.7rem; margin: 0.5rem 0 0; font-size: 0.82rem; color: #64748b; }
    .fc-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: currentColor; opacity: 0.4; display: inline-block; vertical-align: middle; }
    .fc-lede { margin: 0.65rem 0 0; max-width: 68ch; color: #3f4f65; font-size: 0.96rem; line-height: 1.62; }
    [data-theme="night"] .fc-lede { color: rgba(245,245,247,0.7); }

    .fc-card { background: var(--white,#fff); border: 1px solid var(--line,#d2d2d7); border-left: 3.5px solid var(--card-accent,#5856d6); border-radius: var(--radius,18px); box-shadow: var(--shadow,0 12px 34px rgba(0,0,0,0.08)); padding: 1.2rem 1.4rem; margin-bottom: 1rem; }
    .fc-card h2 { margin: 0 0 0.55rem; font-size: 1.2rem; }
    .fc-card h3 { margin: 0.85rem 0 0.3rem; font-size: 1rem; }
    .fc-card p  { margin: 0 0 0.6rem; color: #3f4f65; font-size: 0.88rem; line-height: 1.65; }
    .fc-card p:last-child { margin-bottom: 0; }
    [data-theme="night"] .fc-card { background: #2c2c2e; }
    [data-theme="night"] .fc-card p { color: rgba(245,245,247,0.72); }

    .fc-callout { border-radius: 12px; padding: 0.85rem 1rem; margin: 0.8rem 0; font-size: 0.84rem; line-height: 1.6; }
    .fc-callout.purple { background: rgba(88,86,214,0.1); border-left: 3px solid #5856d6; }
    .fc-callout.orange { background: rgba(255,149,0,0.1); border-left: 3px solid #ff9500; }

    .fc-steps { counter-reset: fc-step; margin: 0.8rem 0; padding: 0; list-style: none; }
    .fc-steps li { counter-increment: fc-step; display: flex; gap: 0.75rem; margin-bottom: 0.7rem; font-size: 0.87rem; line-height: 1.6; color: #3f4f65; }
    [data-theme="night"] .fc-steps li { color: rgba(245,245,247,0.72); }
    .fc-steps li::before { content: counter(fc-step); background: #5856d6; color: #fff; font-size: 0.72rem; font-weight: 700; width: 22px; height: 22px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 0.1rem; }

    .fc-sim-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr); gap: 0.85rem; margin: 0.8rem 0; align-items: stretch; }
    .fc-canvas-wrap { border: 1px solid var(--line,#d2d2d7); border-radius: 14px; overflow: hidden; margin: 0; background: #f7f8fa; }
    [data-theme="night"] .fc-canvas-wrap { background: #1c1c1e; }
    #fc-canvas { width: 100%; height: 320px; display: block; }
    #fc-graph-canvas { width: 100%; height: 320px; display: block; }
    .fc-graph-caption { margin-top: 0.55rem; font-size: 0.78rem; color: #64748b; line-height: 1.5; }

    .fc-meters { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; margin: 0.6rem 0; }
    .fc-meter { background: rgba(0,0,0,0.04); border: 1px solid var(--line,#d2d2d7); border-radius: 10px; padding: 0.55rem 0.7rem; text-align: center; }
    [data-theme="night"] .fc-meter { background: rgba(255,255,255,0.06); }
    .fc-meter-label { font-size: 0.67rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: #64748b; display: block; margin-bottom: 0.2rem; }
    .fc-meter-val { font-size: 1.05rem; font-weight: 700; color: #5856d6; }

    .fc-btn-row { display: flex; gap: 0.5rem; margin: 0.6rem 0; flex-wrap: wrap; }
    .fc-btn { background: #5856d6; color: #fff; border: none; border-radius: 9px; padding: 0.45rem 1rem; font-size: 0.84rem; font-weight: 600; cursor: pointer; }
    .fc-btn:hover { background: #4340c4; }
    .fc-btn.secondary { background: #e5e5ea; color: #1d1d1f; }
    .fc-btn.secondary:hover { background: #d1d1d6; }

    .fc-apps,
    .fc-compare { display: grid; grid-template-columns: repeat(2,1fr); gap: 0.7rem; margin: 0.8rem 0; }
    .fc-app,
    .fc-compare-card { border: 1px solid var(--line,#d2d2d7); border-radius: 12px; padding: 0.8rem; }
    .fc-compare-card { background: rgba(0,0,0,0.03); }
    [data-theme="night"] .fc-compare-card { background: rgba(255,255,255,0.04); }
    .fc-app-icon { font-size: 1.5rem; margin-bottom: 0.3rem; }
    .fc-app strong,
    .fc-compare-card strong { display: block; font-size: 0.84rem; margin-bottom: 0.2rem; }
    .fc-app small,
    .fc-compare-card span { font-size: 0.77rem; color: #64748b; line-height: 1.5; display: block; }
    .fc-note { font-size: 0.78rem; color: #64748b; margin-top: 0.55rem; }

    .fc-practice .fc-problem { border: 1px solid var(--line,#d2d2d7); border-radius: 12px; padding: 0.9rem 1rem; margin-bottom: 0.7rem; }
    .fc-problem p { margin-bottom: 0.5rem; font-size: 0.88rem; color: #3f4f65; line-height: 1.6; }
    [data-theme="night"] .fc-problem p { color: rgba(245,245,247,0.72); }
    .fc-problem-row { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
    .fc-ans-input { border: 1px solid var(--line,#d2d2d7); border-radius: 8px; padding: 0.35rem 0.6rem; font-size: 0.88rem; width: 110px; background: var(--white,#fff); color: var(--text,#1d1d1f); }
    .fc-check-btn { background: #5856d6; color: #fff; border: none; border-radius: 8px; padding: 0.35rem 0.8rem; font-size: 0.84rem; font-weight: 600; cursor: pointer; }
    .fc-check-btn:hover { background: #4340c4; }
    .fc-feedback { font-size: 0.82rem; font-weight: 600; }
    .fc-feedback.ok { color: #34c759; }
    .fc-feedback.err { color: #ff3b30; }
    .fc-hint { font-size: 0.78rem; color: #64748b; margin-top: 0.4rem; display: none; }
    .diff-easy { background: rgba(52,199,89,0.15); color: #248a3d; border-radius: 5px; padding: 0.1rem 0.4rem; font-size: 0.72rem; font-weight: 700; margin-right: 0.4rem; }
    .diff-mid { background: rgba(255,149,0,0.15); color: #c07000; border-radius: 5px; padding: 0.1rem 0.4rem; font-size: 0.72rem; font-weight: 700; margin-right: 0.4rem; }
    .diff-hard { background: rgba(255,59,48,0.12); color: #c0392b; border-radius: 5px; padding: 0.1rem 0.4rem; font-size: 0.72rem; font-weight: 700; margin-right: 0.4rem; }

    @media (max-width: 700px) {
      .fc-sim-grid,
      .fc-meters,
      .fc-apps,
      .fc-compare { grid-template-columns: 1fr; }
    }