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.desktop-nav{display:none}.menu-button{border-radius:8px}.mobile-menu>nav{border:1px solid var(--line);border-radius:0 0 10px 10px;width:calc(100% - 32px)}.mobile-menu nav>a:not(.button){min-height:52px;padding:15px 20px;font-family:IBM Plex Mono,monospace;font-size:14px;display:flex}.mobile-menu nav>a[aria-current=page]{color:var(--copper-light);background:var(--panel)}.mobile-menu-backdrop{height:calc(100vh - 64px);top:64px}.home-tools{grid-template-columns:1fr;gap:10px;max-width:560px}.home-tool-card{grid-template-columns:auto 1fr auto;align-items:center;padding:18px 22px}.home-tool-copy{gap:5px}.home-tool-arrow{grid-column:auto}.home-tool-number{padding:0}.home-secondary{grid-template-columns:1fr;gap:28px;max-width:560px}.scale-about-panel{gap:28px}}@media (max-width:760px){.page-shell,.site-header{width:calc(100% - 32px)}.page-hero{padding:24px 0}.page-hero 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var(--line);background:var(--night-soft);border-radius:10px}.tuner-help summary{cursor:pointer;min-height:56px;color:var(--ink-soft);justify-content:space-between;align-items:center;padding:18px 22px;font-size:13px;list-style:none;display:flex}.tuner-help summary::-webkit-details-marker{display:none}.tuner-help[open] summary{border-bottom:1px solid var(--line)}.tuner-help[open] summary>span{transform:rotate(180deg)}.tuner-help-grid{grid-template-columns:1fr 1fr;gap:32px;padding:24px;display:grid}.tuner-help-card h2{margin:0 0 14px;font-family:Fraunces,Georgia,serif;font-size:24px;font-weight:400}.tuner-help-card p,.tuner-help-card li{color:var(--muted);font-size:13px;line-height:1.8}.tuner-help-card p+p{margin-top:12px}.tuner-help-card ol{margin:0;padding-left:18px}.tuner-help-card li+li{margin-top:10px}.tuner-help-card li::marker{color:var(--copper)}@media (max-width:820px){.tuner-console-compact 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.tuner-readout{gap:24px 12px;padding:25px 18px}.tuner-console-compact .detected-note>strong{font-size:70px}.tuner-console-compact .reading-stat{padding-left:12px}.tuner-console-compact .reading-stat>strong{font-size:22px}.tuner-console-compact .tuning-meter{padding:24px 18px}.tuning-status strong{font-size:12px}.tuner-console-compact .signal-row{grid-template-columns:100px 1fr;padding:16px 18px}.tuner-console-compact .tuner-message{padding:16px 18px}.tuner-workflow-panel,.tuner-help-grid{padding:20px 18px}}@media (max-width:360px){.tuner-control-grid{grid-template-columns:minmax(0,1fr)}.tuner-console-compact .reading-stat>strong{font-size:18px}.scale-tab-list{gap:14px}.scale-tab{font-size:10px}.scale-detail-page .selected-note{grid-template-columns:minmax(0,1fr);gap:18px}.scale-detail-page .reference-tone-button{margin-top:0}.home-commerce-links{gap:6px}}.spectrum-panel{border-bottom:1px solid var(--line);min-width:0;padding:22px 24px 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.site-header{grid-template-columns:minmax(0,1fr) auto auto;gap:18px}.app-header .header-actions{gap:10px;display:flex}.language-select{color:var(--muted);flex:none;align-items:center;display:flex;position:relative}.language-select>svg{pointer-events:none;position:absolute;left:10px}.language-select select{border:1px solid var(--line);background:var(--night-soft);width:118px;min-height:44px;color:var(--ink-soft);cursor:pointer;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;border-radius:8px;padding:8px 7px 8px 32px;font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif;font-size:13px}.language-select select:hover{border-color:var(--copper-deep)}.language-select select:focus-visible{outline:2px solid var(--copper-light);outline-offset:3px}html:lang(zh) body{font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif}html:lang(zh) h1,html:lang(zh) h2,html:lang(zh) h3{letter-spacing:.015em;font-family:PingFang SC,Microsoft YaHei,Arial,sans-serif;line-height:1.4}html:lang(zh) .home-kicker,html:lang(zh) .eyebrow,html:lang(zh) .section-kicker{letter-spacing:.08em}html:lang(zh) .guide-article p{line-height:1.9}@media (max-width:820px){.app-header .site-header{grid-template-columns:minmax(0,1fr) auto;gap:10px}}@media (max-width:480px){.app-header .site-header{gap:8px;width:calc(100% - 24px)}.app-header .brand{gap:7px;font-size:17px}.app-header .brand-mark{flex-basis:25px;width:25px;height:25px}.app-header .header-actions{gap:6px}.language-select>svg{display:none}.language-select select{width:80px;padding-left:8px;font-size:12px}html:lang(zh) .home-intro h1{font-size:32px}}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}
:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--ink:#101c35;--ink-soft:#34496b;--muted:#63758e;--muted-dark:#64748b;--copper:#245ae8;--copper-light:#245ae8;--copper-deep:#b8c9ed;--night:#fff;--night-soft:#f5f8fd;--panel:#f5f8fd;--panel-light:#eaf1ff;--line:#e1e8f2;--line-strong:#cbd7e9;--green:#078563;--red:#c3463c;--font-ui:Arial, "PingFang SC", "Microsoft YaHei", sans-serif;--rail-width:232px}html{background:#fff}body{padding-left:var(--rail-width);font-family:var(--font-ui);background:#fff}body,button,input,select,textarea{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}h1,h2,h3,html:lang(zh) h1,html:lang(zh) h2,html:lang(zh) h3{font-family:var(--font-ui);color:var(--ink);letter-spacing:-.025em;font-weight:700}html:lang(zh) h1,html:lang(zh) h2,html:lang(zh) h3{letter-spacing:0}::selection{color:var(--ink);background:#dce7ff}:focus-visible{outline-offset:4px;outline:2px solid #245ae8}.page-shell{width:calc(100% - 64px);max-width:1200px;margin-inline:auto}.button{min-height:46px;font-family:var(--font-ui);color:#fff;box-shadow:none;background:#245ae8;border-radius:7px;padding:12px 22px;font-size:14px;font-weight:600}.button:hover{background:#1949c9;transform:none}.button-outline{color:#245ae8;background:#fff;border-color:#cbd7e9}.button-outline:hover{color:#1949c9;background:#f0f5ff;border-color:#a6bce9}.text-link{font-family:var(--font-ui);color:#245ae8;border-bottom:0;font-size:14px;font-weight:600}.text-link:hover{color:#1949c9;text-underline-offset:5px;text-decoration:underline}.section-kicker,.eyebrow{font-family:var(--font-ui);letter-spacing:.08em;color:#63758e;font-size:11px}.breadcrumbs,.breadcrumbs ol{font-family:var(--font-ui);color:#63758e;font-size:12px}.page-hero h1,.tool-page-heading h1{color:#101c35;font-family:var(--font-ui);font-weight:700}.app-header{width:var(--rail-width);-webkit-backdrop-filter:none;backdrop-filter:none;background:#f4f8fe;border:0;border-right:1px solid 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