/* Shared design system
   Global layout and reusable page/tool components.
   Loaded by every page; page HTML contains no inline CSS. */

@font-face {
            font-family: "MusGlyphs";
            src: url("/static/fonts/MUSGLYPHS.OTF") format("opentype");
            font-display: swap;
        }

        :root {
            --bg: #f6f7f8;
            --paper: #ffffff;
            --ink: #121316;
            --soft-ink: #2f3137;
            --muted: #6c6b66;
            --line: rgba(18, 19, 22, .18);
            --line-strong: rgba(18, 19, 22, .88);
            --line-dark: #777f88;
            --accent: #1268a8;
            --accent-dark: #084778;
            --accent-quiet: rgba(18, 104, 168, .075);
            --coral: #b44b40;
            --red: #ff2b2b;
            --green: #00b957;
            --blue: #0679ff;
            --code: #edf0f2;
            --display: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", STSong, SimSun, Georgia, serif;
            --serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", STSong, SimSun, Georgia, "Times New Roman", serif;
            --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
            --num: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
        }

        * { box-sizing: border-box; }

        html { scroll-behavior: smooth; }

        body {
            margin: 0;
            min-height: 100vh;
            background: var(--bg);
            color: var(--ink);
            font-family: var(--sans);
            font-size: 15px;
            line-height: 1.72;
            font-variant-numeric: proportional-nums;
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
        }

        a { color: inherit; text-underline-offset: 4px; }

        h1,
        h2,
        h3,
        .brand-title {
            font-family: var(--display);
            font-weight: 600;
            letter-spacing: -.018em;
        }

        .accidental,
        .pitch-name {
            display: inline-block;
            min-width: .46em;
            font-family: "MusGlyphs", serif;
            font-size: 1.17em;
            font-weight: 400;
            line-height: .7;
            vertical-align: -.06em;
        }

        .masthead {
            position: relative;
            overflow: hidden;
            color: #fff;
            background: #111a28;
            border-bottom: 1px solid rgba(255,255,255,.18);
        }

        .masthead-art {
            position: absolute;
            inset: 0;
            z-index: 0;
            overflow: hidden;
        }

        .masthead-art::before {content:"";position:absolute;inset:-8%;background:radial-gradient(circle at 20% 50%,rgba(28,61,104,.28),transparent 36%),radial-gradient(circle at 76% 38%,rgba(42,104,176,.22),transparent 34%),linear-gradient(105deg,#15253b 0%,#1a304b 42%,#111d30 100%);animation:ambient-prism 24s ease-in-out infinite alternate;pointer-events:none;}
        .masthead-art::after {content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(10,20,34,.72) 0%,rgba(10,20,34,.4) 25%,rgba(10,20,34,.08) 56%,rgba(10,20,34,.12) 100%);}
        .tonnetz-ribbon {display:none;}
        .kaleido-field{position:absolute;inset:-10px 0 auto;width:100%;height:270px;overflow:visible;opacity:.98;pointer-events:auto}
        .kaleido-scene{animation:kaleido-drift 19s ease-in-out infinite alternate}
        .kaleido-lens{transform-box:fill-box;transform-origin:center;will-change:transform;transition:filter .25s ease}
        .kaleido-lens-a{animation:lens-turn-a 37s cubic-bezier(.42,0,.58,1) infinite alternate}
        .kaleido-lens-b{animation:lens-turn-b 29s cubic-bezier(.4,0,.6,1) infinite alternate-reverse}
        .kaleido-lens-c{animation:lens-turn-c 43s cubic-bezier(.45,0,.55,1) infinite alternate}
        .kaleido-anchor:hover .kaleido-lens{filter:brightness(1.1) saturate(1.08)}
        .crystal-facet{stroke:rgba(255,255,255,.38);stroke-width:.72;transition:opacity .2s ease,stroke .2s ease}
        .kaleido-anchor:hover .crystal-facet{stroke:rgba(255,255,255,.68)}
        .crystal-sheen{fill:url(#crystalSheen);mix-blend-mode:screen;pointer-events:none}
        .tonnetz-overlay{opacity:.31;transition:opacity .25s ease}
        .kaleido-field:hover .tonnetz-overlay{opacity:.5}
        .tonnetz-overlay line{stroke:rgba(231,240,252,.72);stroke-width:.82}
        .tonnetz-overlay circle{fill:rgba(19,37,61,.88);stroke:rgba(245,249,255,.85);stroke-width:.9}
        .tonnetz-overlay text{fill:rgba(255,255,255,.9);font-family:"MusGlyphs",Georgia,serif;font-size:8.5px;text-anchor:middle;dominant-baseline:middle;pointer-events:none}
        .tonnetz-chord{fill:rgba(255,255,255,.075);stroke:rgba(255,255,255,.48);stroke-width:1.05}
        .kaleido-rose {display:none;}
        .tri-cell{cursor:default;transition:fill .16s ease,stroke .16s ease,opacity .16s ease}.tri-cell:hover{fill:rgba(86,174,240,.38);stroke:rgba(255,255,255,.9);opacity:1}
        @keyframes kaleido-drift{0%{transform:translate3d(-7px,-2px,0) scale(1.01)}52%{transform:translate3d(8px,4px,0) scale(1.025)}100%{transform:translate3d(-2px,1px,0) scale(1.012)}}
        @keyframes lens-turn-a{0%{transform:rotate(-8deg) scale(.99)}46%{transform:rotate(4deg) scale(1.025)}100%{transform:rotate(12deg) scale(1)}}
        @keyframes lens-turn-b{0%{transform:rotate(9deg) scale(1.02)}55%{transform:rotate(-3deg) scale(.985)}100%{transform:rotate(-13deg) scale(1.015)}}
        @keyframes lens-turn-c{0%{transform:rotate(-5deg) scale(1)}38%{transform:rotate(7deg) scale(1.018)}100%{transform:rotate(15deg) scale(.99)}}
        @keyframes ambient-prism{0%{transform:translate3d(-2%,1%,0) scale(1.03)}46%{transform:translate3d(2%,-2%,0) scale(1.08)}100%{transform:translate3d(1%,2%,0) scale(1.04)}}

        .masthead-inner,
        .site-nav-inner,
        .page-shell,
        footer {
            width: min(1180px, calc(100% - 64px));
            margin: 0 auto;
        }

        .masthead-inner {
            position: relative;
            z-index: 1;
            display: flex;
            min-height: 250px;
            align-items: center;
        }

        .brand {
            color: #fff;
            text-decoration: none;
            text-shadow: 0 1px 16px rgba(0,0,0,.45);
        }

        .brand-title {
            display: block;
            font-size: clamp(32px, 3.1vw, 42px);
            line-height: 1.08;
            letter-spacing: .01em;
        }

        .brand-subtitle {
            display: block;
            margin-top: 0;
            color: rgba(255,255,255,.78);
            font-family: var(--sans);
            font-size: clamp(15px, 1.35vw, 19px);
            font-style: normal;
            font-weight: 500;
            letter-spacing: .055em;
        }

        .site-nav {
            position: sticky;
            top: 0;
            z-index: 20;
            border-bottom: 1px solid var(--line-strong);
            background: rgba(255, 255, 255, .94);
            backdrop-filter: blur(16px);
        }

        .site-nav-inner {
            display: flex;
            min-height: 50px;
            align-items: stretch;
            gap: 0;
        }

        .nav-link,
        .dropbtn {
            position: relative;
            display: flex;
            min-width: 72px;
            align-items: center;
            justify-content: center;
            padding: 0 18px;
            border: 0;
            border-left: 1px solid transparent;
            border-right: 1px solid transparent;
            background: transparent;
            color: var(--soft-ink);
            font: 13px/1 var(--sans);
            letter-spacing: .08em;
            text-decoration: none;
            cursor: pointer;
            transition: background .12s ease, color .12s ease, border-color .12s ease;
        }

        .language-link { margin-left: auto; font-family: var(--num); font-weight: 600; letter-spacing: .08em; }

        .nav-link:hover,
        .nav-link:focus,
        .dropdown:hover .dropbtn,
        .dropdown:focus-within .dropbtn {
            border-color: var(--line-strong);
            background: rgba(18,104,168,.09);
            color: var(--accent-dark);
            outline: 0;
        }

        .dropdown { position: relative; display: flex; }

        .dropdown-content {
            visibility: hidden;
            opacity: 0;
            position: absolute;
            left: 0;
            top: 100%;
            min-width: 236px;
            padding: 8px 0;
            border: 1px solid var(--line-strong);
            background: rgba(255,255,255,.98);
            transform: translateY(4px);
            transition: opacity .14s ease, transform .14s ease, visibility .14s ease;
        }

        .dropdown:hover .dropdown-content,
        .dropdown:focus-within .dropdown-content { visibility: visible; opacity: 1; transform: none; }

        .dropdown-content a {
            display: block;
            padding: 10px 15px;
            color: var(--ink);
            font-size: 14px;
            text-decoration: none;
            transition: background .12s ease, color .12s ease;
        }

        .dropdown-content a:hover,
        .dropdown-content a:focus {
            background: rgba(18,104,168,.09);
            color: var(--accent-dark);
            outline: 0;
        }

        main { padding: 50px 0 78px; }
        .page-shell { min-height: 460px; }

        .kicker {
            margin: 0 0 9px;
            color: var(--accent);
            font-family: var(--num);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: .14em;
            text-transform: uppercase;
        }

        .button {
            display: inline-flex;
            min-height: 42px;
            align-items: center;
            justify-content: center;
            padding: 0 18px;
            border: 1px solid var(--ink);
            border-radius: 0;
            background: var(--accent-dark);
            color: var(--paper);
            font: 13px var(--sans);
            letter-spacing: .08em;
            text-decoration: none;
            cursor: pointer;
            transition: background .12s ease, color .12s ease, transform .12s ease;
        }

        .button:hover {
            background: transparent;
            color: var(--ink);
            transform: translateY(-1px);
        }

        .button.secondary {
            background: transparent;
            color: var(--ink);
        }

        .button.secondary:hover {
            background: var(--accent-dark);
            color: var(--paper);
        }

        .term-link {
            color: var(--accent);
            font-weight: 700;
            text-decoration: none;
        }

        .term-link:hover { text-decoration: underline; }

        .reveal { animation: reveal .45s ease both; }
        .delay-1 { animation-delay: .06s; }
        .delay-2 { animation-delay: .12s; }
        .delay-3 { animation-delay: .18s; }
        @keyframes reveal { from { opacity: 0; transform: translateY(10px); } }

        footer {
            padding: 24px 0 40px;
            border-top: 1px solid var(--line-strong);
            color: var(--muted);
            font-size: 13px;
        }

        @media (max-width: 820px) {
            .masthead-inner,.site-nav-inner,.page-shell,footer { width: min(100% - 30px, 1180px); }
            .masthead-inner { min-height: 154px; }
            .kaleido-field { height: 184px; }
            .site-nav-inner { overflow-x: auto; }
            .nav-link,.dropbtn { min-width: auto; white-space: nowrap; padding: 0 14px; }
            main { padding-top: 34px; }
        }

        @media (prefers-reduced-motion: reduce) {
            *,*::before,*::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
        }

.contact-layout {
        display: grid;
        grid-template-columns: minmax(0, 1fr) 340px;
        gap: 46px;
        align-items: start;
        padding-top: 8px;
    }

    .contact-layout h1 {
        max-width: 880px;
        margin: 0;
        font-size: clamp(26px, 3vw, 38px);
        font-weight: 600;
        line-height: 1.32;
    }

    .contact-layout p {
        max-width: 760px;
        margin: 22px 0 0;
        color: var(--muted);
        font-size: 15px;
        line-height: 1.9;
    }

    .contact-list {
        border-top: 2px solid var(--ink);
    }

    .contact-list h2 {
        margin: 14px 0;
        font-size: 18px;
        font-weight: 500;
    }

    .contact-list dl {
        margin: 0;
        border-top: 1px solid var(--line);
    }

    .contact-list div {
        padding: 12px 0;
        border-bottom: 1px solid var(--line);
    }

    .contact-list dt {
        color: var(--muted);
        font-size: 13px;
    }

    .contact-list dd {
        margin: 4px 0 0;
    }

    .email-note {
        display: block;
        margin-top: 5px;
        color: var(--muted);
        font-size: 12px;
    }

    @media (max-width: 820px) {
        .contact-layout {
            grid-template-columns: 1fr;
        }
    }

.home-hero{position:relative;padding:0 0 18px}
.home-hero::before{content:"";display:block;width:100%;height:3px;margin-bottom:30px;background:linear-gradient(90deg,var(--red),var(--green),var(--blue))}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.04fr) minmax(340px,.86fr);gap:58px;align-items:end}
.hero-title{margin:0;font-family:var(--display);font-size:clamp(29px,3.55vw,42px);font-weight:600;line-height:1.14;letter-spacing:-.025em}
.hero-title em{display:block;margin-top:4px;color:var(--soft-ink);font-family:var(--sans);font-size:clamp(16px,1.85vw,23px);font-style:normal;font-weight:500;letter-spacing:.015em}
.lead{max-width:660px;margin:22px 0 0;color:var(--soft-ink);font-family:var(--sans);font-size:clamp(15px,1.25vw,18px);line-height:1.8;letter-spacing:.02em}
.home-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.aphorism{position:relative;display:block;width:100%;height:296px;padding:26px 0 0 30px;border:0;border-left:1px solid var(--line-strong);background:transparent;color:inherit;text-align:left;font:inherit;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.aphorism::before{content:"";position:absolute;left:-1px;top:0;width:1px;height:58px;background:linear-gradient(var(--red),var(--green),var(--blue))}
.aphorism::after{content:"点击切换";position:absolute;right:0;bottom:0;color:rgba(18,19,22,.42);font-family:var(--num);font-size:11px;letter-spacing:.16em;text-transform:uppercase}
html[lang="en"] .aphorism::after{content:"Click to change"}
.aphorism:hover .quote-text{color:var(--accent-dark)}
.aphorism:hover::after{color:var(--ink)}
.quote-stage{position:relative;display:block;height:238px;overflow:hidden}
.quote-body{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-start;transition:opacity .28s ease,transform .28s ease;will-change:opacity,transform}
.quote-body.fade-out{opacity:0;transform:translateY(-10px)}
.quote-body.fade-in{animation:quoteIn .36s ease both}
@keyframes quoteIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.quote-text{margin:0;color:var(--ink);font-family:var(--serif);font-size:clamp(20px,1.85vw,26px);font-weight:600;line-height:1.55;letter-spacing:-.012em;transition:color .15s ease}
.quote-original{margin:16px 0 0;color:var(--muted);font-family:var(--serif);font-size:15px;font-style:italic;line-height:1.48}
.quote-cite{display:block;margin-top:15px;color:var(--muted);font-size:13px;font-style:normal;line-height:1.5}.quote-cite span{display:block;margin-top:3px;color:rgba(18,19,22,.44);font-family:var(--num);font-size:11px;letter-spacing:.03em}
.home-section{margin-top:72px;padding-top:24px;border-top:1px solid var(--line-strong)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:10px}
.home-section h2{margin:0;font-family:var(--display);font-size:clamp(23px,2.1vw,28px);font-weight:600;line-height:1.15;letter-spacing:-.02em}
.section-note{max-width:520px;margin:0;color:var(--muted);font-size:14px;line-height:1.65}
.tool-index{margin-top:24px;border-top:1px solid var(--line)}
.tool-row{display:grid;grid-template-columns:70px minmax(280px,.72fr) minmax(0,1fr) 28px;gap:24px;align-items:baseline;padding:20px 0;border-bottom:1px solid var(--line);color:var(--ink);text-decoration:none;transition:background .14s ease,color .14s ease,padding .14s ease}
.tool-row:hover,.tool-row:focus{padding-left:18px;padding-right:18px;background:rgba(18,104,168,.085);color:var(--accent-dark);outline:0}
.tool-mark{font-family:var(--num);font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--accent)}
.tool-row:hover .tool-mark,.tool-row:focus .tool-mark{color:var(--accent)}
.tool-name{font-family:var(--sans);font-size:clamp(17px,1.55vw,20px);font-weight:400;letter-spacing:-.01em;white-space:nowrap}
.tool-desc{color:var(--muted);font-size:14px}.tool-row:hover .tool-desc,.tool-row:focus .tool-desc{color:#36586f}
.tool-arrow{font-family:var(--display);font-size:24px;text-align:right;transition:transform .14s ease}.tool-row:hover .tool-arrow{transform:translateX(4px)}
.atlas-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-top:26px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.atlas-grid a{min-height:138px;padding:22px 18px;color:var(--ink);text-decoration:none;transition:background .14s ease,color .14s ease}
.atlas-grid a+a{border-left:1px solid var(--line)}
.atlas-grid a:hover,.atlas-grid a:focus{background:rgba(18,104,168,.075);color:var(--accent-dark);outline:0}
.atlas-grid strong{display:block;font-family:var(--sans);font-size:18px;font-weight:500;letter-spacing:-.01em}
.atlas-grid span{display:block;margin-top:12px;color:var(--muted);font-size:13px;line-height:1.65}
.updates-list{margin-top:22px;border-top:1px solid var(--line)}
.updates{display:grid;grid-template-columns:94px 1fr;gap:18px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.updates time{display:inline-flex;width:max-content;align-items:center;padding:3px 8px;background:var(--red);color:#fff;font-family:var(--num);font-size:11px;font-weight:600;letter-spacing:.08em}.updates time::before{content:"NEW!";}.updates a{font-weight:400;text-decoration:none}.updates a:hover{color:var(--accent)}
@media(max-width:940px){.hero-grid{grid-template-columns:1fr;gap:34px}.aphorism{height:270px;padding-left:22px}.quote-stage{height:218px}.section-head{display:block}.section-note{margin-top:10px}.tool-row{grid-template-columns:54px minmax(250px,.85fr) minmax(0,1fr) 22px;gap:15px}.atlas-grid{grid-template-columns:1fr 1fr}.atlas-grid a:nth-child(3){border-left:0;border-top:1px solid var(--line)}.atlas-grid a:nth-child(4){border-top:1px solid var(--line)}}
@media(max-width:620px){.home-hero::before{margin-bottom:24px}.aphorism{height:344px}.quote-stage{height:288px}.quote-text{font-size:19px}.quote-original{font-size:14px}.tool-row{grid-template-columns:1fr;gap:4px}.tool-arrow{text-align:left}.atlas-grid{grid-template-columns:1fr}.atlas-grid a+a{border-left:0;border-top:1px solid var(--line)}.updates{grid-template-columns:1fr;gap:4px}}

.page-head{max-width:780px}.page-head h1{margin:0;font-size:36px}.page-head p{color:var(--muted);font-size:17px}
.catalog-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:34px}.catalog{padding:24px;border:1px solid var(--line);background:#fff}.catalog h2{margin:0}.catalog p{color:var(--muted)}.catalog a{color:var(--accent);font-weight:700}
@media(max-width:700px){.catalog-grid{grid-template-columns:1fr}}

.catalog-head{max-width:800px;border-bottom:1px solid var(--line);padding-bottom:24px}.catalog-head h1{margin:0;font-size:36px}.catalog-head p{color:var(--muted);font-size:17px}
.catalog-group{display:grid;grid-template-columns:190px 1fr;gap:26px;padding:28px 0;border-bottom:1px solid var(--line)}.catalog-group h2{margin:0;font-size:18px}.catalog-links{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 26px}.catalog-links a{padding:10px 0;color:var(--accent);font-weight:700;text-decoration:none}.catalog-links a:hover{text-decoration:underline}
@media(max-width:700px){.catalog-group,.catalog-links{grid-template-columns:1fr}}

.entry-layout{display:grid;grid-template-columns:minmax(0,760px) 260px;gap:64px}.entry-layout h1{margin:0;font-size:34px}.entry-layout .lede{color:var(--muted);font-size:17px}.entry-section{margin-top:30px;padding-top:18px;border-top:1px solid var(--line)}.entry-section h2{margin:0 0 10px;font-size:21px}.entry-section ul{margin:0;padding-left:20px}.entry-section li+li{margin-top:6px}.draft{margin-top:30px;padding:18px;border-left:3px solid var(--gold);background:#fff8e7}.entry-meta{border-top:3px solid var(--accent);padding-top:15px;color:var(--muted);font-size:14px}.entry-meta strong{display:block;color:var(--ink)}
@media(max-width:800px){.entry-layout{grid-template-columns:1fr}}

.lib-head h1{margin:0;font-size:36px}.lib-head p{max-width:800px;color:var(--muted);font-size:17px}.lib-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:32px}.lib-card{padding:20px;border:1px solid var(--line);background:#fff}.lib-card h2{margin:0;font-size:18px}.lib-card p{color:var(--muted);font-size:14px}@media(max-width:800px){.lib-grid{grid-template-columns:1fr 1fr}}@media(max-width:480px){.lib-grid{grid-template-columns:1fr}}

.tools h1{margin:0;font-size:36px}.tools>p{max-width:760px;color:var(--muted);font-size:17px}.tool-list{margin-top:32px;border-top:1px solid var(--line)}.tool{display:grid;grid-template-columns:90px 260px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line);text-decoration:none}.tool b{color:var(--accent);font-size:19px}.tool span{color:var(--muted)}@media(max-width:700px){.tool{grid-template-columns:1fr;gap:4px}}

.ip-head{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:42px;align-items:end;padding-bottom:24px;border-bottom:1px solid var(--line)}
.ip-head h1{margin:0;font-size:clamp(30px,4vw,42px);line-height:1.12}.ip-head p{max-width:780px;margin:14px 0 0;color:var(--muted)}
.ip-note{padding:16px;border-left:3px solid var(--accent);background:var(--accent-quiet);color:var(--muted);font-size:13px}.ip-note strong{display:block;color:var(--ink);font-size:16px}
.ip-forms{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px}.ip-form{padding:22px;border:1px solid var(--line-dark);background:#fff}.ip-form h2{margin:0 0 16px;font-size:18px}.ip-grid{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:end}.ip-grid.aip{grid-template-columns:1fr 120px auto}
.field label{display:block;margin-bottom:7px;color:var(--muted);font-size:13px}.field input{width:100%;min-height:42px;padding:0 12px;border:1px solid var(--line-dark);font:inherit}
.error{min-height:22px;margin:9px 0 0;color:var(--coral);font-size:13px}
.summary{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px}.summary div{padding:14px;border:1px solid var(--line);background:#fff}.summary strong{display:block;color:var(--accent);font-size:18px}.summary span{color:var(--muted);font-size:13px}
.graphs{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:26px}.graph-card{padding:18px;border:1px solid var(--line);background:#fff}.graph-card h2{margin:0 0 8px;font-size:22px}.graph-card p{margin:0 0 12px;color:var(--muted);font-size:13px}
.graph-tools{display:flex;gap:8px;margin:-4px 0 10px}.graph-tools button{border:1px solid var(--line-dark);background:#fff;color:var(--muted);font:12px inherit;padding:3px 8px;cursor:pointer}.graph-tools button:hover{color:var(--accent);border-color:var(--accent)}
.cayley{width:100%;height:380px;border:1px solid var(--line);background:#f8f7f2;cursor:default;touch-action:none}.cayley.dragging-node{cursor:grabbing}.cayley text{font-family:var(--num);font-size:10px;fill:#26313b}.cayley .edge{stroke:#9aa8b4;stroke-width:1}.cayley .edge-hit{stroke:transparent;stroke-width:12;pointer-events:stroke}.cayley .edge-label{font-family:var(--num);font-size:10px;fill:#8a5a35;opacity:0;pointer-events:none}.cayley .edge-group:hover .edge-label{opacity:1}.cayley .edge-group:hover .edge{stroke:var(--coral);stroke-width:1.6}.cayley circle{fill:#fff;stroke:var(--accent);stroke-width:1.5}.cayley circle.major{fill:#eaf2f7}.cayley .node{cursor:grab}.cayley .node:hover circle{stroke:var(--coral);stroke-width:2}.cayley .node.dragging circle{fill:#fff2df;stroke:var(--coral);stroke-width:2.2}
.table-wrap{max-height:280px;overflow:auto;margin-top:14px}.ip-table{width:100%;border-collapse:collapse;font-size:13px}.ip-table th,.ip-table td{padding:8px;border-top:1px solid var(--line);text-align:left}.ip-table th{color:var(--muted);font-weight:400}.ip-references{margin-top:36px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}.ip-references h2{margin:0 0 10px;color:var(--ink);font-size:17px}.ip-references a{color:var(--accent)}
@media(max-width:980px){.ip-head,.graphs,.ip-forms,.ip-grid,.ip-grid.aip,.summary{grid-template-columns:1fr}}

.nr-head{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:42px;align-items:end;padding-bottom:24px;border-bottom:1px solid var(--line)}
.nr-head h1{margin:0;font-size:clamp(32px,4.2vw,44px);line-height:1.15}.nr-head p{max-width:760px;margin:16px 0 0;color:var(--muted)}
.nr-note{padding:16px;border-left:3px solid var(--accent);background:var(--accent-quiet);color:var(--muted);font-size:13px}.nr-note strong{color:var(--ink)}
.tonnetz-shell{margin-top:28px;border:1px solid var(--line-dark);background:#f7f6f1}
.tonnetz-toolbar{display:grid;grid-template-columns:minmax(220px,1fr) auto auto;gap:18px;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line);background:#fff}
.chord-readout label{display:block;color:var(--muted);font-size:12px}.chord-display{min-height:30px;margin-top:3px;color:var(--ink);font-size:17px;font-weight:700}
.mode-switches{display:flex;gap:16px;flex-wrap:wrap}.mode-switches label{display:flex;gap:7px;align-items:center;color:var(--muted);font-size:14px}.mode-switches input{accent-color:var(--accent)}
.zoom-tools{display:flex;gap:6px}.icon-button{width:36px;height:36px;border:1px solid var(--line-dark);background:#fff;color:var(--ink);font:17px inherit;cursor:pointer}.icon-button:hover{border-color:var(--accent);color:var(--accent)}
.tonnetz-stage{position:relative;min-height:570px;overflow:hidden;touch-action:none;cursor:default}.tonnetz-stage.dragging{cursor:grabbing}.tonnetz-stage canvas{display:block;width:100%;height:570px}
.stage-help{position:absolute;left:12px;bottom:10px;padding:5px 8px;background:rgba(255,255,255,.85);color:var(--muted);font-size:12px;pointer-events:none}
.transform-panel{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:end;padding:18px 16px;border-top:1px solid var(--line);background:#fff}
.transform-groups{display:flex;gap:28px;flex-wrap:wrap}.transform-group>span{display:block;margin-bottom:7px;color:var(--muted);font-size:12px}.plr-buttons{display:flex;gap:6px}.plr{min-width:40px;height:38px;border:1px solid var(--accent);background:#fff;color:var(--accent);font-weight:700;cursor:pointer}.plr:hover,.plr:focus{background:var(--accent);color:#fff;outline:0}
.path-status{margin-top:14px;color:var(--muted);font-size:13px}.path-status strong{display:block;color:var(--ink);font-family:Consolas,monospace}.clear-button{padding:10px 16px;border:1px solid var(--line-dark);background:#fff;color:var(--ink);cursor:pointer}.clear-button:hover{border-color:var(--coral);color:var(--coral)}
.nr-references{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}.nr-references h2{color:var(--ink);font-size:18px}.nr-references a{color:var(--accent)}
@media(max-width:850px){.nr-head,.tonnetz-toolbar,.transform-panel{grid-template-columns:1fr}.tonnetz-stage,.tonnetz-stage canvas{height:460px;min-height:460px}.zoom-tools{position:absolute;right:10px;z-index:2}}

.sim-head{max-width:880px;padding-bottom:24px}
.sim-head h1{margin:0;font-size:clamp(30px,4vw,42px);font-weight:400;line-height:1.2}
.intro{max-width:760px;margin:16px 0 0;color:var(--muted);line-height:1.8}
.theory-note{margin-top:20px;padding:15px 17px;border-left:3px solid var(--accent);background:var(--accent-quiet);color:var(--muted);font-size:14px;line-height:1.75}
.theory-note strong{margin-right:8px;color:var(--ink);font-size:14px}
.method-bar{display:flex;gap:0;margin-top:12px;border-bottom:1px solid var(--line)}
.method-label,.method-count{display:none}
.method-tabs{display:flex;gap:28px;flex-wrap:wrap}.method-tab{padding:14px 2px 11px;border:0;border-bottom:3px solid transparent;background:transparent;color:var(--muted);font:15px inherit;text-decoration:none;cursor:pointer}
.method-tab.active{border-bottom-color:var(--accent);color:var(--accent)}.method-tab:hover{color:var(--accent)}
.analysis-pane{display:none;margin-top:34px}.analysis-pane.active{display:block;animation:pane-in .5s ease both}
@keyframes pane-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.forte-workspace{margin-top:34px}
.workspace-head{display:flex;justify-content:space-between;gap:24px;align-items:start;margin-bottom:16px}
.workspace-head h2{margin:0;font-size:28px;font-weight:400}.workspace-head p{max-width:680px;margin:6px 0 0;color:var(--muted);font-size:14px}
.method-mark{display:none}
.input-panel{margin-top:24px;padding:24px;border:1px solid var(--line);border-radius:4px;background:#fafbfc}
.input-panel h2{margin:0 0 18px;font-size:20px;font-weight:500}
.input-grid{display:grid;grid-template-columns:1fr 1fr auto;gap:12px;align-items:end}
.field label{display:block;margin-bottom:7px;color:var(--muted);font-size:13px}
.field input{width:100%;min-height:44px;padding:0 13px;border:1px solid var(--line-dark);border-radius:3px;background:var(--paper);color:var(--ink);font:inherit;outline:none}
.field input:focus{border-color:var(--accent);box-shadow:0 0 0 2px rgba(139,30,30,.08)}
.input-actions{display:flex;gap:8px}.error-message{min-height:22px;margin:9px 0 0;color:var(--accent);font-size:13px}
.results{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:30px}
.result-card{min-height:330px;padding:24px;border:1px solid var(--line);border-radius:4px;background:var(--paper)}
.result-card.interval{border-color:var(--line)}.eyebrow{display:none}
.result-card h2{margin:0;font-size:21px;font-weight:500}.relation{display:block;margin:18px 0 10px;padding:0;background:transparent;color:var(--accent);font-size:18px;font-weight:600}
.interval .relation{background:transparent;color:var(--accent)}.description{min-height:48px;margin:0 0 18px;color:var(--muted);font-size:14px}
.data-table{width:100%;border-collapse:collapse;font-size:14px}.data-table th,.data-table td{padding:9px 0;border-top:1px solid var(--line);text-align:left;vertical-align:top}
.data-table th{width:120px;padding-right:14px;color:var(--muted);font-weight:400}.mono{font-family:Consolas,monospace;overflow-wrap:anywhere}
.future-slot{margin-top:42px;padding-top:24px;border-top:1px solid var(--line);color:var(--muted)}
.future-slot strong{color:var(--ink);font-weight:500}.future-slot p{max-width:720px;margin:5px 0 0;font-size:14px}
.fourier-workspace{margin-top:34px}
.fourier-summary{display:grid;grid-template-columns:minmax(230px,.72fr) minmax(0,1.28fr);gap:24px;margin-top:22px}
.metric-card,.spectrum-card,.component-card{padding:24px;border:1px solid var(--line);border-radius:4px;background:var(--paper)}
.metric-value{margin:8px 0 0;color:var(--accent);font-size:34px;line-height:1.1;font-weight:500}
.metric-caption{margin:7px 0 20px;color:var(--muted);font-size:13px}
.metric-list{margin:0}.metric-list div{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-top:1px solid var(--line);font-size:14px}
.metric-list dt{color:var(--muted)}.metric-list dd{margin:0;font-family:Consolas,monospace}
.spectrum-head{display:flex;justify-content:space-between;gap:16px;align-items:start}.spectrum-head h3{margin:0;font-size:18px;font-weight:500}
.legend{display:flex;gap:14px;color:var(--muted);font-size:12px}.legend span::before{content:"";display:inline-block;width:9px;height:9px;margin-right:5px;border-radius:2px;background:var(--accent)}
.legend .second::before{background:#91a9bb}
.spectrum-plot{display:grid;grid-template-columns:32px 1fr;gap:8px;margin-top:22px}.spectrum-axis{position:relative;display:flex;height:202px;flex-direction:column;justify-content:space-between;align-items:end;padding-right:7px;border-right:1px solid var(--line-dark);color:var(--muted);font:10px var(--num)}.spectrum-axis::before{content:"|Fk|";position:absolute;left:-17px;top:88px;transform:rotate(-90deg);letter-spacing:.06em}.spectrum-chart{display:grid;grid-template-columns:repeat(7,minmax(34px,1fr));gap:12px;height:230px;padding:0 4px 28px;border-bottom:1px solid var(--line)}
.spectrum-group{position:relative;display:flex;justify-content:center;align-items:flex-end;gap:4px;height:100%}
.spectrum-bar{width:min(18px,42%);min-height:1px;border-radius:2px 2px 0 0;background:var(--accent);transition:height .3s ease}
.spectrum-bar.second{background:#91a9bb}.spectrum-label{position:absolute;left:0;right:0;bottom:-25px;text-align:center;color:var(--muted);font:12px Consolas,monospace}
.component-card{margin-top:24px}.component-card h3{margin:0 0 14px;font-size:18px;font-weight:500}
.component-table{width:100%;border-collapse:collapse;font-size:13px}.component-table th,.component-table td{padding:9px 8px;border-top:1px solid var(--line);text-align:right}
.component-table th:first-child,.component-table td:first-child{text-align:left}.component-table th{color:var(--muted);font-weight:400}
.difference-note{margin:14px 0 0;color:var(--muted);font-size:13px}.formula-note{margin-top:20px;padding:14px 16px;background:var(--code);color:var(--muted);font:13px/1.7 Consolas,monospace;overflow-wrap:anywhere}
.references{margin-top:48px;padding-top:22px;border-top:1px solid var(--line-dark);color:var(--muted);font-size:13px;line-height:1.75}.references h2{margin:0 0 12px;color:var(--ink);font-size:17px;font-weight:500}.references ol{margin:0;padding-left:24px}.references a{color:var(--accent)}
.intro sup a,.theory-note sup a,.workspace-head sup a{color:var(--accent);text-decoration:none}
@media(max-width:880px){.fourier-summary{grid-template-columns:1fr}}
@media(max-width:880px){.sim-head,.results{grid-template-columns:1fr}.method-bar{grid-template-columns:1fr}.method-count{display:none}}
@media(max-width:680px){.input-grid{grid-template-columns:1fr}.input-actions .button{flex:1}.forte-workspace{padding-left:10px}.workspace-head,.future-slot{display:block}.method-mark{display:block;margin-top:8px}}

.tool-title {
        display: grid;
        grid-template-columns: minmax(0, 1fr) 260px;
        gap: 36px;
        align-items: end;
        padding-bottom: 24px;
        border-bottom: 1px solid var(--line-dark);
    }

    .tool-title h1 {
        margin: 0;
        font-size: clamp(34px, 5vw, 56px);
        font-weight: 500;
        line-height: 1.18;
    }

    .tool-title p {
        max-width: 760px;
        margin: 18px 0 0;
        color: var(--muted);
        font-size: 17px;
        line-height: 1.9;
    }

    .tool-meta {
        color: var(--muted);
        font-size: 13px;
        border-top: 1px solid var(--line);
        padding-top: 10px;
    }

    .input-row {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto auto;
        gap: 8px;
        margin-top: 24px;
    }

    .input-row input {
        width: 100%;
        min-height: 40px;
        padding: 0 12px;
        border: 1px solid var(--line-dark);
        background: var(--paper);
        color: var(--ink);
        font: inherit;
        outline: none;
    }

    .input-row input:focus {
        border-color: var(--ink);
    }

    .error-text {
        min-height: 22px;
        margin-top: 8px;
        color: var(--accent);
        font-size: 13px;
    }

    .workbench {
        display: grid;
        grid-template-columns: minmax(280px, 0.92fr) minmax(360px, 1.08fr);
        gap: 36px;
        margin-top: 28px;
        align-items: stretch;
    }

    .block {
        border-top: 2px solid var(--ink);
    }

    .workbench > .block {
        min-height: 390px;
    }

    .block h2 {
        margin: 14px 0 12px;
        font-size: 18px;
        font-weight: 500;
    }

    .result-table {
        width: 100%;
        border-collapse: collapse;
        border-top: 1px solid var(--line);
        font-size: 14px;
    }

    .result-table th,
    .result-table td {
        padding: 10px 0;
        border-bottom: 1px solid var(--line);
        vertical-align: top;
        text-align: left;
    }

    .result-table th {
        width: 120px;
        padding-right: 16px;
        color: var(--muted);
        font-weight: 400;
    }

    .res-box,
    .scroll-area {
        font-family: "Consolas", "Liberation Mono", monospace;
        overflow-wrap: anywhere;
    }

    .theory-references {
        margin-top: 44px;
        padding-top: 20px;
        border-top: 1px solid var(--line-dark);
        color: var(--muted);
        font-size: 13px;
        line-height: 1.75;
    }

    .theory-references h2 {
        margin: 0 0 10px;
        color: var(--ink);
        font-size: 17px;
        font-weight: 500;
    }

    .theory-references a { color: var(--accent); }

    .clock-area {
        display: grid;
        place-items: center;
        padding: 2px 0;
        border-top: 1px solid var(--line);
        border-bottom: 1px solid var(--line);
    }

    #pc-clock {
        width: min(100%, 340px);
        height: auto;
        overflow: visible;
    }

    .clock-face {
        fill: none;
        stroke: #222;
        stroke-width: 1.2;
    }

    .clock-dot {
        fill: var(--paper);
        stroke: #222;
        stroke-width: 1.2;
        cursor: pointer;
    }

    .clock-dot:hover {
        fill: #ece8df;
    }

    .clock-dot.active {
        fill: var(--accent);
        stroke: var(--accent);
    }

    .clock-label {
        fill: #111;
        font-family: Arial, sans-serif;
        font-size: 14px;
    }

    .clock-note,
    .clock-accidental {
        font-family: "MusGlyphs", serif;
    }

    .clock-accidental {
        font-size: 18px;
    }

    .clock-num {
        fill: var(--muted);
        font-family: "Times New Roman", serif;
        font-size: 11px;
    }

    .clock-fill {
        fill: rgba(125, 31, 31, 0.10);
    }

    .clock-line {
        stroke: var(--accent);
        stroke-width: 1.8;
        stroke-linecap: round;
    }

    .hint {
        margin: 10px 0 0;
        color: var(--muted);
        font-size: 13px;
    }

    .analysis-section {
        margin-top: 42px;
    }

    .analysis-grid {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 22px;
        border-top: 1px solid var(--line-dark);
        padding-top: 18px;
    }

    .analysis-card label {
        display: block;
        margin-bottom: 8px;
        color: var(--ink);
        font-size: 15px;
    }

    .scroll-area {
        height: 170px;
        padding: 10px;
        border: 1px solid var(--line);
        background: var(--code);
        color: var(--ink);
        font-size: 13px;
        line-height: 1.55;
        overflow: auto;
        white-space: pre-wrap;
    }

    @media (max-width: 920px) {
        .tool-title,
        .workbench,
        .analysis-grid {
            grid-template-columns: 1fr;
        }

        .tool-meta {
            max-width: 360px;
        }
    }

    @media (max-width: 620px) {
        .input-row {
            grid-template-columns: 1fr;
        }

        .button {
            width: 100%;
        }
    }