* { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; margin: 0; background: #0f172a; color: #e2e8f0; line-height: 1.5; }
#app { max-width: 720px; margin: 0 auto; padding: 1.25rem; }
h1 { font-size: 1.6rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.2rem; margin: 0 0 1rem; }
.card { background: #1e293b; border-radius: 16px; padding: 1.5rem; margin-bottom: 1rem; }
.splash { text-align: center; padding: 2rem 1rem; }
.splash p { color: #94a3b8; margin-bottom: 2rem; }
.choice { display: block; width: 100%; background: #334155; border: none; color: #e2e8f0; padding: 1.25rem; border-radius: 12px; font-size: 1.1rem; margin: 0.75rem 0; cursor: pointer; }
.choice:hover { background: #3b82f6; }
.choice small { display: block; font-size: 0.8rem; opacity: 0.8; margin-top: 0.25rem; }
label { display: block; margin: 0.75rem 0 0.3rem; font-size: 0.9rem; color: #cbd5e1; }
input, select { width: 100%; padding: 0.7rem; border-radius: 8px; border: 1px solid #475569; background: #0f172a; color: #e2e8f0; font-size: 1rem; }
button.primary { background: #3b82f6; color: white; border: none; padding: 0.8rem 1.4rem; border-radius: 8px; cursor: pointer; font-size: 1rem; margin-top: 1rem; }
button.primary:hover { background: #2563eb; }
button.secondary { background: transparent; color: #94a3b8; border: 1px solid #475569; padding: 0.6rem 1rem; border-radius: 8px; cursor: pointer; margin-top: 0.5rem; }
.result { margin-top: 1rem; }
.warning { color: #fbbf24; }
.cliff { color: #f87171; }
.steps { display: flex; gap: 0.4rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.steps span { padding: 0.3rem 0.6rem; border-radius: 6px; background: #1e293b; font-size: 0.85rem; }
.steps span.active { background: #3b82f6; }
.line-header { display: grid; grid-template-columns: 1fr 90px 90px auto auto; gap: 0.4rem; margin: 0.6rem 0 0.2rem; font-size: 0.75rem; color: #94a3b8; text-transform: uppercase; letter-spacing: 0.03em; }
.line { display: grid; grid-template-columns: 1fr 90px 90px auto auto; gap: 0.4rem; margin: 0.4rem 0; align-items: center; }
.line input { padding: 0.5rem; font-size: 0.9rem; }
.upload-area { border: 2px dashed #475569; border-radius: 12px; padding: 2rem; text-align: center; color: #94a3b8; margin: 1rem 0; }
.upload-area input { margin-top: 1rem; }