:root{--bg: #f4f3f0;--surface: #ffffff;--surface-2: #ecebe7;--text: #16161a;--muted: #6b6a70;--line: #dddbd5;--accent: #e5322d;--accent-ink: #ffffff;--accent-soft: #fde8e7;--warn-bg: #fff4dc;--warn-text: #7a4b00;--error-bg: #fde8e7;--error-text: #9b1c18;--ok: #1f8a4c;--radius: 14px;--shadow: 0 1px 2px rgb(0 0 0 / .04), 0 4px 16px rgb(0 0 0 / .04);color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic UI,Meiryo,system-ui,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}@media(prefers-color-scheme:dark){:root{--bg: #111113;--surface: #1b1b1f;--surface-2: #26262b;--text: #f1f0ed;--muted: #9b9aa1;--line: #313137;--accent: #ff4a3f;--accent-soft: #3a1918;--warn-bg: #3a2d10;--warn-text: #ffd27a;--error-bg: #3a1918;--error-text: #ffaaa4;--shadow: none;color-scheme:dark}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input{font:inherit;color:inherit}.page{max-width:1120px;margin:0 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input[type=range]{position:absolute;inset:0;width:100%;margin:0;background:none;pointer-events:none;appearance:none;-webkit-appearance:none}.dual input[type=range]::-webkit-slider-runnable-track{background:transparent;height:28px}.dual input[type=range]::-moz-range-track{background:transparent}.dual input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;pointer-events:auto;width:22px;height:22px;margin-top:3px;border-radius:50%;background:var(--surface);border:3px solid var(--accent);cursor:grab;box-shadow:0 1px 4px #00000040}.dual input[type=range]::-moz-range-thumb{pointer-events:auto;width:16px;height:16px;border-radius:50%;background:var(--surface);border:3px solid var(--accent);cursor:grab}.trim-row{display:flex;justify-content:space-between;align-items:flex-end;gap:12px}.trim-btns{align-items:center}.trim-len{display:grid;text-align:center;font-variant-numeric:tabular-nums}.trim-len 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14px;border-radius:10px;font-size:14px}.alert-warn{background:var(--warn-bg);color:var(--warn-text)}.alert-error{background:var(--error-bg);color:var(--error-text)}.engine{display:grid;gap:6px}.engine-title{margin:0;font-size:13px;font-weight:700}.engine-kind{display:flex;align-items:center;gap:6px}.dot{width:8px;height:8px;border-radius:50%;background:var(--line);flex:none}.dot-on{background:var(--ok)}.about{margin-top:56px;display:grid;gap:40px;max-width:820px}.about h2{margin:0 0 14px;font-size:20px;font-weight:900;letter-spacing:-.01em}.about p{margin:0;line-height:1.85}.about-block>p{color:var(--muted)}.steps{margin:0;padding:0;list-style:none;counter-reset:step;display:grid;gap:10px}.steps li{counter-increment:step;display:grid;grid-template-columns:32px 1fr;gap:12px;align-items:start;line-height:1.7}.steps li:before{content:counter(step);width:32px;height:32px;display:grid;place-items:center;background:var(--accent);color:var(--accent-ink);font-weight:900;font-family:ui-monospace,Menlo,monospace}.features{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}.feature h3{margin:0 0 6px;font-size:15px;font-weight:800}.feature p{font-size:14px;color:var(--muted);line-height:1.75}.faq{margin:0;border-top:1px solid var(--line)}.faq-item{padding:14px 0;border-bottom:1px solid var(--line)}.faq dt{font-weight:800;margin-bottom:4px}.faq dt:before{content:"Q. ";color:var(--accent);font-family:ui-monospace,Menlo,monospace}.faq dd{margin:0;color:var(--muted);line-height:1.8;font-size:14px}.notes{margin-top:40px;padding-top:24px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.notes ul{margin:0;padding-left:1.2em;display:grid;gap:4px}.notes strong{color:var(--text)}.credit{margin:20px 0 0;font-size:12px}@media(max-width:520px){.masthead-side{align-items:flex-start;width:100%}.page{padding:20px 16px 40px}.seg{padding:8px 14px;font-size:14px}.result-size .took{margin-left:0;width:100%}}