/* ---------------- demo page ---------------- */
.demo-header { background: var(--tp-ink); color: var(--white); padding: 36px 0 40px; }
.demo-header .eyebrow { color: var(--sage); }
.demo-header h1 { color: var(--white); font-size: clamp(1.9rem, 3.5vw, 2.6rem); margin-bottom: 10px; }
.demo-header p { color: rgba(255,255,255,0.72); max-width: 620px; margin-bottom: 0; }
.demo-header-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.demo-back { display: inline-flex; align-items: center; gap: 8px; color: rgba(255,255,255,0.75); text-decoration: none; font-size: 0.9rem; font-weight: 500; }
.demo-back:hover { color: var(--white); }
.demo-back svg { width: 16px; height: 16px; }

.demo-live-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(133,178,155,0.14); border: 1px solid rgba(133,178,155,0.35); color: var(--sage); border-radius: 999px; padding: 6px 14px; font-size: 0.8rem; font-weight: 600; }
.demo-live-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--sage); animation: pulse 1.8s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.demo-body { padding: 48px 0 100px; }
.demo-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 32px; align-items: start; }
@media (max-width: 980px) { .demo-grid { grid-template-columns: 1fr; } }

.demo-panel { background: var(--white); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 28px; }
.demo-panel + .demo-panel { margin-top: 24px; }
.demo-panel h3 { font-size: 1.05rem; margin-bottom: 18px; }

.field { margin-bottom: 20px; }
.field label { display: flex; justify-content: space-between; font-size: 0.86rem; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.field label .val { font-family: var(--mono); color: var(--forest); font-weight: 600; }
.field select, .field input[type="number"] {
  width: 100%; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--hairline);
  font-family: var(--sans); font-size: 0.92rem; background: var(--white); color: var(--ink);
}
.field input[type="range"] { width: 100%; accent-color: var(--forest); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-inline { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.toggle-row { display: flex; gap: 10px; }
.toggle-btn {
  flex: 1; padding: 9px 10px; border-radius: 8px; border: 1.5px solid var(--hairline); background: var(--white);
  font-size: 0.85rem; font-weight: 600; color: var(--caption); cursor: pointer; text-align: center;
}
.toggle-btn.active { border-color: var(--forest); background: var(--mint); color: var(--forest-deep); }

.fiber-pct-row { display: flex; align-items: center; gap: 12px; }
.fiber-pct-row input[type="range"] { flex: 1; }
.fiber-pct-badge { font-family: var(--mono); font-size: 0.85rem; width: 48px; text-align: right; color: var(--forest); font-weight: 600; }

/* results */
.results-hero { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 24px; }
@media (max-width: 540px) { .results-hero { grid-template-columns: 1fr; } }
.result-stat { background: var(--tp-ink); color: var(--white); border-radius: var(--radius); padding: 22px 24px; }
.result-stat .lbl { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.65; margin-bottom: 8px; }
.result-stat .num { font-family: var(--mono); font-size: 2.1rem; font-weight: 600; }
.result-stat .num .unit { font-size: 0.95rem; font-weight: 400; opacity: 0.7; margin-left: 4px; }
.result-stat.cost { background: var(--forest-deep); }

.bars { display: flex; flex-direction: column; gap: 10px; margin: 22px 0; }
.bar-row { display: grid; grid-template-columns: 90px 1fr 70px; align-items: center; gap: 12px; }
.bar-row .name { font-size: 0.82rem; font-weight: 600; color: var(--caption); }
.bar-track { background: var(--mint); border-radius: 6px; height: 10px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--forest); border-radius: 6px; transition: width 0.5s ease; }
.bar-fill.neg { background: var(--sage); }
.bar-row .val { font-family: var(--mono); font-size: 0.8rem; text-align: right; color: var(--ink); }

.opt-controls { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 4px; }
.opt-result { margin-top: 24px; padding-top: 24px; border-top: 1px dashed var(--hairline); display: none; }
.opt-result.show { display: block; }
.opt-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
@media (max-width: 540px) { .opt-compare { grid-template-columns: 1fr; } }
.opt-col { padding: 16px; border-radius: 10px; }
.opt-col.before { background: var(--mint-pale); border: 1px solid var(--hairline); }
.opt-col.after { background: var(--tp-ink); color: var(--white); }
.opt-col .t { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.6; margin-bottom: 6px; }
.opt-col .n { font-family: var(--mono); font-size: 1.5rem; font-weight: 600; }
.opt-col .d { font-size: 0.8rem; opacity: 0.75; margin-top: 4px; }
.solving-note { font-size: 0.78rem; color: var(--caption); font-style: italic; margin-top: 10px; }
.solving-note.show-live { color: var(--forest); font-weight: 600; font-style: normal; }

.demo-cta-strip { background: var(--mint); border-radius: var(--radius); padding: 32px; margin-top: 32px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.demo-cta-strip h3 { margin-bottom: 4px; }
.demo-cta-strip p { margin: 0; color: var(--caption); }