/* Why carousel, ported from F2. Diagram markup keeps F2's inline styles. */
#why .why-lead { margin-top: 16px; max-width: 760px; font-size: 18px; color: var(--ink2); }
#why h2 { max-width: 820px; font-size: clamp(32px, 3.6vw, 48px); letter-spacing: -0.015em; text-wrap: balance; }
.why-card { margin-top: 36px; border-radius: 28px; background: var(--surface); border: 1px solid var(--line); overflow: hidden; }
.why-card:focus-visible { outline-offset: -3px; }
.why-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; padding: 18px clamp(16px, 2.6vw, 32px); border-bottom: 1px solid var(--line); }
.why-counter { display: flex; align-items: center; gap: 14px; }
.why-ring-track { stroke: var(--line); }
.why-ring-fill { stroke: var(--accent); transition: stroke-dashoffset 0.5s; }
.why-count { margin: 0; font-family: var(--display); font-weight: var(--dw); font-size: 26px; color: var(--ink); }
.why-tabs { display: flex; flex-wrap: wrap; gap: 6px; }
.why-tab { min-height: 40px; padding: 0 14px; border-radius: 999px; cursor: pointer; font: inherit; font-size: 14px; transition: background 0.2s; border: 1px solid var(--line2); background: var(--surface); color: var(--ink); }
.why-tab[aria-pressed="true"] { border-color: var(--accent); background: var(--accent); color: #fff; }
.why-nav { display: flex; gap: 8px; }
.why-nav button { width: 44px; height: 44px; border-radius: 50%; border: 0; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.why-prev { background: var(--accent-soft); color: var(--accent); }
.why-next { background: var(--accent); color: #fff; }
.why-body { display: flex; flex-wrap: wrap; gap: 32px 48px; padding: clamp(20px, 3.4vw, 44px); }
.why-text { flex: 1.3 1 440px; min-width: 0; }
.why-title { margin: 0; font-size: 15px; font-weight: 600; color: var(--accent); }
.why-pairs { display: flex; flex-direction: column; gap: 22px; margin-top: 18px; }
.why-pair[hidden], .why-diagram[hidden] { display: none; }
.why-problem { margin: 0; max-width: none; font-family: var(--display); font-weight: var(--dw); font-size: clamp(24px, 2.3vw, 32px); line-height: 1.18; letter-spacing: -0.01em; color: var(--ink); }
.why-answer { margin: 6px 0 0; max-width: none; font-size: 15px; color: var(--ink2); }
.why-answer span { font-weight: 600; color: var(--accent); }
.why-stage { flex: 1 1 408px; min-width: 0; align-self: stretch; display: flex; align-items: center; justify-content: center; padding: 24px; border-radius: 22px; background: var(--canvas); background-image: radial-gradient(var(--line2) 1px, transparent 1px); background-size: 20px 20px; }
.why-diagram { width: 100%; display: flex; justify-content: center; }
.why-diagram p { color: var(--ink); max-width: none; }