@font-face{font-family:Pretendard;src:url(/fonts/Pretendard-Regular.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}@font-face{font-family:Pretendard;src:url(/fonts/Pretendard-Bold.woff2) format("woff2");font-weight:700;font-style:normal;font-display:swap}@font-face{font-family:JetBrains Mono;src:url(/fonts/JetBrainsMono-Regular.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}:root{--bg: #ffffff;--fg: #111827;--muted: #6b7280;--border: #e5e7eb;--accent: #2563eb;--accent-fg: #ffffff;--surface-1: #f9fafb;--surface-2: #f3f4f6;--topbar-h: 64px;--font-sans: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;color-scheme:light}:root[data-theme=dark]{--bg: #0a0a0a;--fg: #e5e5e5;--muted: #a3a3a3;--border: #262626;--accent: #60a5fa;--accent-fg: #0a0a0a;--surface-1: #171717;--surface-2: #262626;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--fg);font-family:var(--font-sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-wrap:anywhere}html{scroll-behavior:smooth}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:16px;height:var(--topbar-h);padding:0 24px;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--fg);text-decoration:none}.brand-mark{display:inline-flex;color:var(--fg)}.nav{display:flex;gap:18px;margin-left:auto;font-size:14px}.nav a{color:var(--muted);text-decoration:none;transition:color .12s}.nav a:hover{color:var(--fg)}.icon-btn{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;background:transparent;border:1px solid var(--border);border-radius:8px;color:var(--muted);cursor:pointer;padding:0;transition:color .12s,border-color .12s}.icon-btn:hover{color:var(--fg);border-color:var(--fg)}.icon-btn svg{width:18px;height:18px}.icon-btn .icon-sun{display:none}.icon-btn .icon-moon{display:block}:root[data-theme=dark] .icon-btn .icon-sun{display:block}:root[data-theme=dark] .icon-btn .icon-moon{display:none}.primary,.ghost{display:inline-flex;align-items:center;justify-content:center;padding:12px 22px;font:inherit;font-weight:600;font-size:15px;border-radius:8px;text-decoration:none;cursor:pointer;border:1px solid transparent;transition:background .12s,border-color .12s,color .12s,transform 60ms}.primary{background:var(--accent);color:var(--accent-fg)}.primary:hover{filter:brightness(1.06);transform:translateY(-1px)}.ghost{background:transparent;border-color:var(--border);color:var(--fg)}.ghost:hover{border-color:var(--fg)}.hero{position:relative;padding:96px 24px 0;overflow:hidden}.hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:0;background:radial-gradient(ellipse 60% 50% at 50% 0%,color-mix(in srgb,var(--accent) 14%,transparent) 0%,transparent 70%),radial-gradient(ellipse 40% 30% at 85% 15%,color-mix(in srgb,var(--accent) 8%,transparent) 0%,transparent 60%),linear-gradient(180deg,transparent 0%,var(--bg) 100%)}.hero-bg:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(to right,color-mix(in srgb,var(--fg) 4%,transparent) 1px,transparent 1px),linear-gradient(to bottom,color-mix(in srgb,var(--fg) 4%,transparent) 1px,transparent 1px);background-size:48px 48px;-webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 30%,#000 0%,transparent 75%);mask-image:radial-gradient(ellipse 70% 60% at 50% 30%,#000 0%,transparent 75%)}.hero-inner{position:relative;z-index:1;max-width:920px;margin:0 auto;text-align:center;padding-bottom:80px}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:0 0 18px}.hero-title{font-size:clamp(36px,6vw,64px);line-height:1.1;font-weight:800;letter-spacing:-.03em;margin:0 0 22px}.hl{color:var(--accent)}.hero-sub{font-size:clamp(16px,1.6vw,19px);color:var(--muted);max-width:720px;margin:0 auto 36px;line-height:1.7}.hero-sub code{font-family:var(--font-mono);font-size:.88em;background:var(--surface-2);padding:.1em .4em;border-radius:4px;color:var(--fg)}.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:18px}.hero-cta .primary{box-shadow:0 8px 24px -8px color-mix(in srgb,var(--accent) 60%,transparent)}.hero-meta{font-size:13px;color:var(--muted);margin:0 0 56px}.mock-window{max-width:880px;margin:0 auto;background:var(--bg);border:1px solid var(--border);border-radius:14px;overflow:hidden;box-shadow:0 1px 2px color-mix(in srgb,var(--fg) 8%,transparent),0 20px 60px -20px color-mix(in srgb,var(--fg) 20%,transparent),0 30px 80px -30px color-mix(in srgb,var(--accent) 25%,transparent);text-align:left}.mock-titlebar{display:flex;align-items:center;gap:6px;padding:10px 14px;background:var(--surface-1);border-bottom:1px solid var(--border)}.mock-dot{width:12px;height:12px;border-radius:50%;display:inline-block}.mock-dot-r{background:#ff5f57}.mock-dot-y{background:#febc2e}.mock-dot-g{background:#28c840}.mock-title{margin-left:10px;font-size:12.5px;color:var(--muted);font-weight:500}.mock-body{display:grid;grid-template-columns:1fr 1fr;min-height:280px}.mock-pane{padding:14px 18px;font-size:12.5px;overflow:hidden}.mock-pane-src{background:var(--bg);border-right:1px solid 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10px;font-size:11.5px}.mock-math{font-family:KaTeX_Math,Georgia,serif;font-style:italic;color:var(--fg)}.mock-diagram{width:100%;max-width:120px;height:auto;color:var(--fg);margin:0 auto;display:block}.section{padding:96px 24px;border-top:1px solid var(--border);position:relative}.section:nth-of-type(2n){background:var(--surface-1)}.section-inner{max-width:1080px;margin:0 auto}.section-title{font-size:clamp(28px,3.5vw,36px);font-weight:800;letter-spacing:-.02em;margin:0 0 32px;text-align:center}.lead{font-size:18px;color:var(--fg);max-width:680px;margin:0 auto 24px;text-align:center;line-height:1.7}.problem-list{max-width:680px;margin:0 auto;padding:0;list-style:none}.problem-list li{position:relative;padding:12px 0 12px 28px;border-bottom:1px solid var(--border);font-size:15.5px;color:var(--fg);line-height:1.6}.problem-list li:before{content:"–";position:absolute;left:4px;color:var(--accent);font-weight:700}.problem-list li:last-child{border-bottom:none}.problem-list 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20px;line-height:1.65}.mode-features{list-style:none;padding:0;margin:0 0 24px}.mode-features li{font-size:14.5px;color:var(--fg);position:relative;padding:6px 0 6px 22px}.mode-features li:before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:800}.mode-cta{width:100%}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.feature{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:24px;transition:transform .16s ease,border-color .16s,box-shadow .16s}.feature:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--accent) 40%,var(--border));box-shadow:0 12px 28px -16px color-mix(in srgb,var(--accent) 35%,transparent)}.feature-icon{font-size:28px;margin-bottom:12px;display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;background:var(--surface-2);border-radius:10px}.feature h3{margin:0 0 8px;font-size:17px;font-weight:700;letter-spacing:-.01em}.feature 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16px;gap:10px}.nav{gap:14px;font-size:13px}.hero{padding:56px 18px 0}.hero-inner{padding-bottom:56px}.section{padding:64px 18px}.mode-grid,.download-grid,.feature-grid{grid-template-columns:1fr}.hero-cta{flex-direction:column}.hero-cta .primary,.hero-cta .ghost{width:100%}.mock-body{grid-template-columns:1fr;min-height:0}.mock-pane-src{border-right:none;border-bottom:1px solid var(--border)}.appfoot{padding:40px 18px 20px}.appfoot-inner{grid-template-columns:1fr;gap:28px;padding-bottom:24px}}