:root{color-scheme:light;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--page:#f8fafc;--band:#f1f5f9;--panel:#f8fafc;--paper:#fff;--surface:#fff;--surface-soft:#f1f5f9;--accent:#2563eb;--accent-strong:#0b4171;--coral:#3b82f6;--danger:#dc4c4c;--gold:#d48a0c;--blue:#2563eb;--success:#0f9f76;--shadow-sm:0 1px 3px #0f172a0d;--shadow:0 1px 3px #0f172a0d, 0 18px 48px #0f172a12;--ease-out:cubic-bezier(.23, 1, .32, 1);--radius-sm:10px;--radius-md:16px;--radius-lg:24px;font-family:SUIT Variable,Pretendard Variable,Pretendard,Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.content-topbar,.content-footer{justify-content:space-between;align-items:center;gap:24px;width:min(1040px,100% - 32px);margin:0 auto;padding:18px 0;display:flex}.content-topbar nav,.content-footer nav{color:var(--muted);align-items:center;gap:16px;font-weight:800;display:flex}.guide-shell{width:min(840px,100% - 32px);margin:24px auto 80px}.breadcrumbs{color:var(--muted);align-items:center;gap:8px;font-size:.9rem;display:flex;overflow:hidden}.breadcrumbs span:last-child{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.guide-article{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm);margin-top:28px;padding:clamp(24px,5vw,64px)}.guide-article h1{font-size:clamp(2.2rem,6vw,4.2rem);line-height:1.06}.guide-lede{color:var(--muted);font-size:1.15rem;line-height:1.8}.guide-meta{color:var(--muted);font-size:.88rem}.guide-article section{margin-top:52px}.guide-article h2{letter-spacing:-.035em;margin:0 0 18px;font-size:clamp(1.45rem,3vw,2rem)}.guide-article section p,.guide-article li{font-size:1.04rem;line-height:1.85}.guide-article ul{border-radius:var(--radius-md);background:var(--surface-soft);padding:20px 20px 20px 42px}.guide-cta{border-radius:var(--radius-md);background:color-mix(in srgb, var(--accent) 10%, var(--surface));margin-top:56px;padding:28px}.guide-cta strong{font-size:1.2rem}.guide-cta p{color:var(--muted);line-height:1.7}.related-guides{margin-top:56px}.related-guides>div,.guide-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}.related-guides a,.guide-grid article{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);gap:10px;padding:24px;display:grid}.related-guides span,.guide-grid p{color:var(--muted);line-height:1.65}.guide-grid h2{margin:0;font-size:1.3rem}.guide-link{color:var(--accent-strong);font-weight:900}@media (width<=680px){.content-topbar nav>a:first-child{display:none}.content-footer{flex-direction:column;align-items:flex-start}.content-footer nav{flex-wrap:wrap}.related-guides>div,.guide-grid{grid-template-columns:1fr}.guide-article{padding:26px 20px}}:root[data-theme=dark]{color-scheme:dark;--ink:#eaf0f7;--muted:#94a3b8;--line:#243244;--page:#0b1220;--band:#0e1929;--panel:#111c2e;--paper:#0f1a2a;--surface:#142033;--surface-soft:#18263a;--accent:#60a5fa;--accent-strong:#93c5fd;--coral:#3b82f6;--danger:#f87171;--gold:#fbbf24;--blue:#93c5fd;--success:#34d399;--shadow-sm:0 1px 3px #00000047;--shadow:0 1px 3px #00000047, 0 22px 58px #0000004d}:root[data-theme=dark] .button.primary{color:#08111f}*{box-sizing:border-box}html{background:var(--page);color:var(--ink);scroll-behavior:smooth}body{word-break:keep-all;overflow-wrap:break-word;font-variant-numeric:tabular-nums;min-width:320px;margin:0}a{color:inherit;text-decoration:none}button{font:inherit}button,.button{transition:transform .14s var(--ease-out), border-color .18s ease, background-color .18s ease, color .18s ease}button:active,.button:active{transform:scale(.97)}:focus-visible{outline:3px solid color-mix(in srgb, var(--accent) 46%, transparent);outline-offset:3px}.page-shell{background:radial-gradient(circle at 78% 7%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 32rem), linear-gradient(180deg, color-mix(in srgb, var(--surface) 52%, transparent), transparent 620px), var(--page);min-height:100vh}.topbar{justify-content:space-between;align-items:center;gap:24px;width:min(1180px,100% - 32px);margin:0 auto;padding:18px 0;display:flex}.brand{letter-spacing:-.025em;white-space:nowrap;align-items:center;gap:12px;min-width:0;font-weight:850;display:flex}.brand-logo{flex:none;width:40px;height:40px;display:block}.brand-text{min-width:0;display:block}.topbar-actions{align-items:center;gap:18px;display:flex}.nav,.display-controls{align-items:center;display:flex}.nav{color:var(--muted);gap:18px;font-size:.95rem;font-weight:800}.login-link{color:var(--accent-strong)}.display-controls{gap:8px}.control-button{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);min-width:46px;min-height:36px;color:var(--ink);cursor:pointer;justify-content:center;align-items:center;gap:7px;padding:0 11px;font-weight:900;display:inline-flex}.theme-icon{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2px;width:17px;height:17px}.theme-icon-sun{display:none}:root[data-theme=dark] .theme-icon-sun{display:block}:root[data-theme=dark] .theme-icon-moon{display:none}.hero{grid-template-columns:minmax(360px,.85fr) minmax(520px,1.15fr);align-items:center;gap:clamp(36px,5vw,74px);width:min(1180px,100% - 32px);min-height:min(760px,82vh);margin:0 auto;padding:clamp(28px,7vw,86px) 0 clamp(38px,7vw,86px);display:grid;position:relative;overflow:visible}.hero-copy{z-index:3;max-width:590px;position:relative}.eyebrow{color:var(--accent-strong);letter-spacing:.14em;text-transform:uppercase;margin:0 0 12px;font-size:.76rem;font-weight:900}h1{letter-spacing:-.065em;word-break:keep-all;margin:0;font-size:clamp(3rem,6vw,5.3rem);font-weight:900;line-height:.96}h1 span{max-width:100%;display:inline-block}.hero-copy p{color:var(--muted);max-width:530px;margin:22px 0 0;font-size:clamp(1.05rem,1.6vw,1.22rem);line-height:1.75}.hero-copy .hero-principle{border:1px solid color-mix(in srgb, var(--accent) 30%, var(--line));background:color-mix(in srgb, var(--paper) 86%, transparent);width:fit-content;color:var(--accent-strong);border-radius:999px;margin-top:18px;padding:8px 11px;font-size:.78rem;font-weight:850;line-height:1.3}.actions{flex-wrap:wrap;gap:12px;margin-top:30px;display:flex}.button{border:1px solid var(--ink);border-radius:var(--radius-sm);text-align:center;justify-content:center;align-items:center;min-height:46px;padding:0 18px;font-weight:900;display:inline-flex}.button.primary{border-color:var(--accent-strong);background:var(--accent-strong);color:#fff;box-shadow:0 8px 20px color-mix(in srgb, var(--accent-strong) 18%, transparent)}.button.secondary{background:var(--surface)}.product-stage{z-index:1;pointer-events:none;min-width:0;min-height:560px;position:relative}.editor-preview{border:1px solid color-mix(in srgb, var(--line) 82%, transparent);border-radius:var(--radius-lg);background:var(--paper);width:min(700px,100%);min-height:514px;box-shadow:var(--shadow);opacity:1;grid-template-columns:190px minmax(0,1fr);display:grid;position:relative;top:auto;right:auto;overflow:hidden}.editor-preview:before{content:"";background:linear-gradient(120deg, color-mix(in srgb, var(--page) 28%, transparent), transparent 44%);pointer-events:none;position:absolute;inset:0}.preview-sidebar{border-right:1px solid var(--line);background:var(--surface-soft);padding:18px}.preview-title{margin:0 0 18px;font-weight:900}.preview-pill{border-radius:var(--radius-sm);color:var(--muted);margin:10px 0;padding:9px 10px;font-size:.9rem;display:block}.preview-pill.active{background:var(--surface);color:var(--ink);box-shadow:inset 3px 0 0 var(--coral)}.preview-workspace{padding:22px}.preview-layer-key{flex-wrap:wrap;gap:6px;margin:-8px 0 14px;display:flex}.preview-layer-key span{background:var(--surface-soft);color:var(--muted);border-radius:999px;padding:5px 8px;font-size:.68rem;font-weight:850}.preview-layer-key .chord{color:var(--accent-strong)}.preview-layer-key .tab{color:var(--coral)}.preview-layer-key .notes{color:var(--blue)}.preview-toolbar{justify-content:space-between;align-items:center;gap:12px;margin-bottom:22px;display:flex}.metric{color:var(--muted);font-size:.86rem}.tab-paper{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--paper);gap:10px;padding:22px 18px;font-family:IBM Plex Mono,SFMono-Regular,Menlo,Consolas,monospace;display:grid}.tab-row{color:var(--ink);white-space:nowrap;grid-template-columns:24px 1fr;align-items:center;gap:8px;display:grid}.tab-line{border-top:2px solid var(--ink);height:24px;position:relative}.fret{background:var(--paper);min-width:22px;color:var(--coral);text-align:center;padding:1px 4px;font-weight:900;position:absolute;top:-12px;transform:translate(-50%)}.chord-label{color:var(--accent-strong);margin-left:46%;font-family:inherit;font-weight:900}.note-strip{grid-template-columns:repeat(4,38px);gap:8px;margin-top:20px;margin-left:46%;font-family:inherit;display:grid}.note-strip span{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-soft);min-height:34px;color:var(--accent-strong);place-items:center;font-weight:900;display:grid}.copy-route{border:1px solid color-mix(in srgb, var(--coral) 36%, var(--line));border-radius:var(--radius-sm);background:color-mix(in srgb, var(--coral) 5%, var(--surface));grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;margin-top:12px;padding:10px 12px;font-family:inherit;display:grid}.copy-route svg{width:100%;height:64px}.route-strings,.route-column,.route-path{fill:none;stroke-linecap:round}.route-strings{stroke:color-mix(in srgb, var(--ink) 48%, var(--line));stroke-width:1.5px}.route-column{stroke:var(--accent);stroke-width:10px;opacity:.14}.route-path{stroke:var(--coral);stroke-width:3px}.route-node{fill:var(--coral);stroke:var(--paper);stroke-width:3px}.copy-route strong{max-width:96px;color:var(--ink);font-size:.74rem;line-height:1.35}.candidate-panel{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:18px;display:grid}.candidate-panel span{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-soft);min-height:42px;color:var(--ink);text-align:center;padding:11px 8px;font-weight:800}.section-band{padding:clamp(40px,7vw,80px) 0}.section-band:last-of-type{padding-bottom:clamp(112px,12vw,180px);padding-bottom:max(clamp(112px, 12vw, 180px), calc(112px + env(safe-area-inset-bottom)))}.section-inner{width:min(1180px,100% - 32px);margin:0 auto}.section-heading{max-width:720px}.section-heading h2{letter-spacing:-.055em;word-break:keep-all;margin:0;font-size:clamp(2rem,4vw,3.6rem);line-height:1}.section-heading p{color:var(--muted);margin:16px 0 0;line-height:1.75}.section-subtitle{text-transform:uppercase;font-weight:900;color:var(--accent-strong)!important;margin:0 0 10px!important}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:28px;display:grid}.feature{border:1px solid color-mix(in srgb, var(--line) 72%, transparent);border-radius:var(--radius-md);background:var(--surface);min-height:210px;box-shadow:var(--shadow-sm);padding:30px;position:relative;overflow:hidden}.feature:before{content:"";background:repeating-linear-gradient(to bottom, var(--line) 0 1px, transparent 1px 2px);opacity:.8;height:5px;position:absolute;top:0;left:24px;right:24px}.feature strong{color:var(--accent-strong);margin-bottom:12px;display:block}.feature p{color:var(--muted);margin:0;line-height:1.65}.feature-highlight{background:linear-gradient(145deg, color-mix(in srgb, var(--accent) 10%, var(--surface)), var(--surface));border-color:color-mix(in srgb, var(--accent) 42%, var(--line))}.flow{grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin-top:28px;display:grid;position:relative}.flow-step{border-radius:var(--radius-md);background:var(--surface);min-height:116px;box-shadow:var(--shadow-sm);border:0;padding:24px 20px 20px;font-weight:800;position:relative}.flow-step b{background:var(--accent-strong);color:#fff;border-radius:50%;place-items:center;width:28px;height:28px;margin-bottom:12px;font-size:.72rem;display:grid}.flow-step span,.flow-step small{display:block}.final-cta{border-radius:var(--radius-lg);background:linear-gradient(135deg, color-mix(in srgb, var(--accent) 13%, var(--surface)), var(--surface));width:min(1180px,100% - 32px);box-shadow:var(--shadow);border:0;justify-content:space-between;align-items:center;gap:32px;margin:0 auto;padding:clamp(28px,5vw,54px);display:flex}.final-cta>div{max-width:760px}.final-cta h2{margin:0;font-size:clamp(2rem,4vw,3.6rem);line-height:1.02}.principle-band{border-radius:var(--radius-lg);background:var(--paper);width:min(1180px,100% - 32px);box-shadow:0 18px 50px color-mix(in srgb, var(--ink) 7%, transparent);border:0;grid-template-columns:minmax(0,.9fr) minmax(420px,1.1fr);align-items:center;gap:clamp(32px,7vw,96px);margin:clamp(24px,4vw,56px) auto;padding:clamp(30px,6vw,72px);display:grid}.principle-copy h2{letter-spacing:-.06em;text-wrap:balance;margin:0;font-size:clamp(2rem,4.2vw,3.8rem);line-height:1.02}.principle-copy>p:last-child{color:var(--muted);margin:20px 0 0;line-height:1.75}.layer-stack{gap:10px;display:grid}.layer-card{border-radius:var(--radius-md);background:var(--surface);min-height:72px;box-shadow:var(--shadow-sm);border:0;grid-template-columns:46px minmax(0,1fr);align-items:center;padding:12px 18px;display:grid}.layer-card span{color:var(--muted);font-family:IBM Plex Mono,SFMono-Regular,Menlo,Consolas,monospace;font-size:.72rem}.layer-card strong{font-size:.95rem}.layer-card.chord{color:var(--accent-strong);transform:translate(-18px)}.layer-card.tab{color:var(--coral)}.layer-card.notes{color:var(--blue);transform:translate(18px)}.final-cta p:not(.section-subtitle){color:var(--muted);margin:16px 0 0;line-height:1.7}.final-cta .button{flex:none}.site-footer{width:min(1180px,100% - 32px);padding:34px 0 max(34px, env(safe-area-inset-bottom));color:var(--muted);justify-content:space-between;align-items:center;gap:20px;margin:0 auto;font-size:.9rem;display:flex}.site-footer strong{color:var(--ink)}.site-footer>div{gap:5px;display:grid}.footer-links{flex-wrap:wrap;gap:12px 18px;display:flex}.footer-links a{color:var(--muted);font-weight:800;text-decoration:none}.legal-shell{width:min(920px,100% - 32px);margin:0 auto}.legal-topbar,.legal-footer{justify-content:space-between;align-items:center;gap:20px;padding:24px 0;display:flex}.legal-topbar .button{min-height:42px;padding:0 16px}.legal-card{border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow);border:0;padding:clamp(26px,5vw,56px)}.legal-eyebrow,.legal-date{color:var(--accent-strong);letter-spacing:.08em;font-size:.78rem;font-weight:900}.legal-card h1{margin:8px 0 14px;font-size:clamp(2.1rem,5vw,3.5rem)}.legal-lead{max-width:680px;color:var(--muted);margin:0;font-size:1.08rem;font-weight:700;line-height:1.7}.legal-date{margin:20px 0 0}.legal-card section{border-top:1px solid var(--line);margin-top:34px;padding-top:26px}.legal-card section h2{margin:0 0 10px;font-size:1.1rem}.legal-card section p{color:var(--muted);margin:0;line-height:1.8}.legal-footer{color:var(--muted);font-size:.86rem}.flow-step small{color:var(--muted);word-break:normal;margin-top:7px;font-size:.9rem;font-weight:700;line-height:1.35}@media (width<=1080px){.topbar{align-items:flex-start}.topbar-actions{flex-direction:column;align-items:flex-end}}@media (width<=960px){.feature-grid,.flow{grid-template-columns:1fr 1fr}.hero{grid-template-columns:1fr;align-items:flex-start;min-height:0}.editor-preview{width:min(760px,100%);top:auto;left:auto}.product-stage{min-height:520px}.editor-preview:before{background:linear-gradient(135deg, color-mix(in srgb, var(--page) 16%, transparent), transparent 42%)}.principle-band{grid-template-columns:1fr}}@media (width<=680px){.actions{align-items:flex-start}.topbar{flex-wrap:wrap;align-items:center;gap:12px}.topbar-actions{flex-direction:row;justify-content:space-between;align-items:center;gap:10px;width:100%}.nav{flex-flow:wrap;gap:14px;font-size:.86rem}.display-controls{flex:none}.hero{min-height:0;padding-top:18px}h1{font-size:clamp(2.1rem,10vw,3.6rem)}.editor-preview{grid-template-columns:1fr;top:auto}.product-stage{min-height:540px}.preview-sidebar{display:none}.preview-workspace{padding:14px}.candidate-panel,.feature-grid,.flow,.copy-route{grid-template-columns:1fr}.copy-route strong{max-width:none}.principle-band{grid-template-columns:1fr;padding:24px 20px}.layer-card.chord,.layer-card.notes{transform:none}.note-strip{margin-left:0}.final-cta,.site-footer,.legal-topbar,.legal-footer{flex-direction:column;align-items:flex-start}.final-cta .button{width:100%}}@media (hover:hover) and (pointer:fine){.nav a:hover{color:var(--ink)}.control-button:hover,.button:hover{border-color:var(--accent)}.button.primary:hover{background:var(--accent)}.feature:hover{border-color:color-mix(in srgb, var(--accent) 40%, var(--line))}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}button,.button{transition-duration:.01ms}button:active,.button:active{transform:none}}