:root{--bg: #f4f6fb;--card: #ffffff;--line: #e3e7f0;--ink: #1c2434;--muted: #66718c;--accent: #3b6ef5;--accent-soft: #eaf0fe;--ok: #16a34a;--warn: #d97706;--danger: #dc2626;--blue: #2563eb;--red: #dc2626;--green: #16a34a;--radius: 10px;--shadow: 0 1px 2px rgba(28, 36, 52, .06), 0 4px 14px rgba(28, 36, 52, .05)}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:14px;line-height:1.55}.app{min-height:100vh;display:flex;flex-direction:column}.ai-banner{display:flex;align-items:center;justify-content:center;gap:12px;background:#eef0ff;color:#5b5bd6;font-size:12px;font-weight:600;padding:6px 12px;border-bottom:1px solid #dfe3ff;letter-spacing:.02em}.ai-banner-dismiss{border:1px solid #c9cdf0;background:transparent;color:#5b5bd6;font-size:11.5px;font-weight:600;border-radius:999px;padding:1px 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currentColor}.dot.blue{background:var(--blue);color:var(--blue);border-radius:2px}.dot.red{background:var(--red);color:var(--red)}.dot.green{background:var(--green);color:var(--green)}.result-chart{width:100%;height:auto;display:block}.chart-grid{stroke:#e6eaf3;stroke-width:1}.chart-tick{font-size:10.5px;fill:var(--muted)}.chart-axis-label{font-size:13px;font-style:italic;font-weight:700;fill:var(--ink)}.chart-curve{fill:none;stroke:var(--green);stroke-width:2.5}.chart-point{fill:#fff;stroke:var(--red);stroke-width:2}.chart-equation{font-size:12px;font-family:SF Mono,Consolas,monospace;fill:var(--muted)}.chart-empty{padding:30px 0;text-align:center;color:var(--muted)}@media (max-width: 980px){.main{grid-template-columns:1fr}}