.voice-history{background:#f5f3ee;overflow:hidden}.history-lead,.voice-lab,.sound-bench,.model-note,.actual-voice,.history-references{max-width:1224px;margin:0 auto}.history-lead{padding:64px 36px 30px}.history-lead .eyebrow{color:#087e89}.history-lead h1{font-size:clamp(42px,7vw,78px);line-height:1.06;letter-spacing:-3px;margin:16px 0 24px;max-width:850px}.history-lead h1 em{color:#dc781d;font-style:normal}.history-subtitle{font-size:23px;color:#355564;line-height:1.5}.history-opening{font-size:18px;line-height:1.8;max-width:780px}.journey-nav{display:flex;gap:10px;flex-wrap:wrap;margin-top:35px}.journey-step{border:1px solid #c7d4d7;border-radius:8px;padding:12px 16px;background:transparent;color:#203b49;font:inherit;font-weight:700;cursor:pointer;text-align:left}.journey-step span{display:inline-block;margin-right:10px;color:#087d89;font-size:12px}.journey-step[aria-pressed=true]{background:#0c2c3b;color:#fff;border-color:#0c2c3b}.journey-step[aria-pressed=true] span{color:#5eced5}.voice-lab{display:grid;grid-template-columns:1fr 1.25fr;gap:32px;padding:36px;background:#fff;border:1px solid #d9e2e3;border-radius:16px}.stage-copy h2,.sound-bench h2,.actual-voice h2{font-size:clamp(26px,3vw,38px);line-height:1.15;letter-spacing:-1px;margin:14px 0 20px}.stage-copy p{line-height:1.8;font-size:17px}.stage-copy .eyebrow{font-size:12px;color:#08838f}.analogy{border-top:1px solid #dce5e6;margin-top:25px;padding-top:20px}.analogy small{display:block;font-size:10px;letter-spacing:1.7px;color:#68818b;margin-bottom:8px}.analogy strong{display:block;font-size:15px;line-height:1.5}.analogy>span{display:block;color:#da791f;font-size:22px;padding:8px 0}.stage-visual{background:#0c2b3a;border-radius:12px;padding:20px;color:#fff;align-self:start}.diagram-title{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:10px;letter-spacing:1.3px;color:#8bd6db}.diagram-title button{background:transparent;border:1px solid #456572;color:#fff;border-radius:6px;padding:8px;font:inherit;letter-spacing:0;cursor:pointer}.stage-visual svg{width:100%;height:auto;display:block;margin-top:12px;overflow:visible}.stage-visual rect{fill:#153e4f;stroke:#4a6976;stroke-width:1.5}.stage-visual text{fill:#c9dce3;font-family:Arial,sans-serif;font-size:15px;font-weight:700}.stage-visual text.sub{font-size:12px;font-weight:400;fill:#83a4b1}.stage-visual .wave-line{fill:none;stroke:#5eced5;stroke-width:2.5}.stage-visual .orange{stroke:#ffae55}.signal-wire,.control-wire{fill:none;stroke:#5eced5;stroke-width:2;stroke-dasharray:6 5}.control-wire{stroke:#7895a1;stroke-dasharray:3 5}.stage-visual [data-block]{opacity:.42;transition:opacity .25s}.stage-visual [data-block].active{opacity:1}.stage-visual .active rect{stroke:#5eced5}.stage-visual.is-moving .signal-wire{animation:signal-flow 1.1s linear infinite}.diagram-caption{font-size:12px;line-height:1.6;color:#a5c0ca;margin:12px 0 0}.stage-navigation{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;border-top:1px solid #e2e8e9;padding-top:22px}.stage-navigation button,.sound-buttons button{background:#0e7e8a;color:#fff;border:0;border-radius:6px;padding:12px 17px;font:inherit;font-weight:700;cursor:pointer}.stage-navigation button:disabled{opacity:.35;cursor:default}.stage-navigation span{font-size:13px;color:#58717c}.sound-bench{display:grid;grid-template-columns:1fr 1.25fr;gap:32px;padding:40px 36px;margin-top:24px}.sound-bench .eyebrow,.actual-voice .eyebrow{color:#087d89;font-size:11px}.sound-bench p{line-height:1.7}.sound-buttons{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.sound-buttons button{font-size:13px;padding:12px}.sound-buttons button[aria-pressed=true]{background:#d6781d}.sound-buttons #stop-sound{background:transparent;border:1px solid #afbdc3;color:#294957}.sound-controls label{display:block;font-size:14px;font-weight:700;margin-bottom:12px}.sound-controls input{width:100%;accent-color:#0f8b96;cursor:pointer}.range-labels{display:flex;justify-content:space-between;font-size:13px;color:#4a6876}.sound-controls #sound-status{font-size:12px;color:#52717c;min-height:40px}.model-note{font-size:13px;color:#52707c;line-height:1.8;padding:0 36px 35px}.actual-voice{display:grid;grid-template-columns:1.25fr 1fr;gap:45px;padding:40px 36px;background:#e7eeeb;border-radius:12px}.actual-voice p{line-height:1.7}.actual-voice audio{width:100%;max-width:420px;margin-top:8px}.actual-voice aside{padding-left:30px;border-left:1px solid #bfcece}.actual-voice aside h3{font-size:22px}.actual-voice a,.history-references a{color:#087d89;font-weight:700}.sample-name{font-size:14px;font-weight:700}.history-references{padding:45px 36px 70px}.history-references h2{font-size:22px}.history-references li{margin:14px 0;font-size:14px;line-height:1.5}.voice-history button:focus-visible,.voice-history input:focus-visible{outline:3px solid #ff9b34;outline-offset:4px}@keyframes signal-flow{to{stroke-dashoffset:-22}}@media(max-width:760px){.history-lead{padding:40px 22px 25px}.history-lead h1{letter-spacing:-1.8px}.history-subtitle{font-size:19px}.journey-nav{display:grid;grid-template-columns:1fr 1fr;gap:8px}.journey-step{font-size:12px;padding:12px 10px}.journey-step:last-child{grid-column:1/-1}.voice-lab{margin:0 14px;padding:22px;grid-template-columns:1fr;gap:25px}.stage-visual{padding:12px}.sound-bench,.actual-voice{grid-template-columns:1fr;padding:30px 22px;gap:18px}.actual-voice{margin:0 14px}.actual-voice aside{border-left:0;padding-left:0;border-top:1px solid #bfcece;padding-top:12px}.model-note{padding:0 22px 30px}.history-references{padding:35px 22px 50px}}@media(prefers-reduced-motion:reduce){.stage-visual.is-moving .signal-wire{animation:none}.stage-visual [data-block]{transition:none}}
#human-diagram svg{max-height:430px;margin:auto}#human-diagram .face-outline,.mouth-demo .face-outline{fill:#f0bb8d;stroke:#c87847;stroke-width:3}#human-diagram .feature,.mouth-demo .feature{fill:none;stroke:#895239;stroke-width:3;stroke-linecap:round}#human-diagram .lip-mouth,.mouth-demo .lip-mouth{fill:#3b2025;stroke:#c46b62;stroke-width:5}#human-diagram .lip-highlight,.mouth-demo .lip-highlight{fill:none;stroke:#f79a81;stroke-width:3}.mouth-demo{max-width:220px;margin:20px auto 0}.mouth-demo svg{width:100%;display:block}.mouth-demo text{font:16px Arial;fill:#294755}#human-diagram .mouth-label{fill:#fff}.circuit-element{fill:none;stroke:#ffae55;stroke-width:2.5}#circuit-diagram circle{fill:#153e4f;stroke:#5eced5;stroke-width:2}.resonance-plot{width:100%;margin-top:22px;background:#e9f0ed;border-radius:8px}.resonance-plot .wave-line{fill:none;stroke:#087d89;stroke-width:2.5}.resonance-plot text{font:11px Arial;fill:#456371}.vowel-choices{display:flex;gap:10px;margin-bottom:20px}.vowel-choices button{flex:1;font:700 20px Arial;padding:14px;border:1px solid #afc1c6;background:#fff;color:#183e4d;border-radius:8px;cursor:pointer}.vowel-choices button[aria-pressed=true]{background:#ffb95d;border-color:#dc8c32}.sound-controls output{float:right;color:#087d89;font-weight:400}.sound-controls input{margin-bottom:16px}.circuit-readout{font-size:14px;line-height:1.8;color:#087d89;padding:18px;border-left:3px solid #ffb95d;margin-top:20px}

.voice-lab>.sound-bench{grid-column:1/-1;max-width:none;width:100%;margin:0;padding:28px 0 6px;border-top:1px solid #dce5e6;gap:32px}.voice-lab>.sound-bench h2{font-size:clamp(24px,2.6vw,32px)}@media(max-width:760px){.voice-lab>.sound-bench{padding:24px 0 0;gap:20px}}
/* Side-view vocal tract illustration. */
#human-diagram svg{max-height:510px}.xray-head{fill:url(#xray-fill);stroke:#91d9fb;stroke-width:2.5}.xray-skull,.xray-brain{fill:none;stroke:#73bce8;stroke-width:2;opacity:.8}.xray-brain{fill:#7ed0f9;fill-opacity:.08}.xray-bone,.xray-teeth,.xray-spine{fill:#c4efff;fill-opacity:.24;stroke:#b4e3ff;stroke-width:2}.xray-jaw{fill:#76c6ef;fill-opacity:.25;stroke:#b4e3ff;stroke-width:2.5}.xray-nasal{fill:#43a2cf;fill-opacity:.2;stroke:#70c5f3;stroke-width:2}.xray-palate,.xray-throat,.xray-larynx{fill:none;stroke:#99daff;stroke-width:3;stroke-linecap:round}.tongue-shape{fill:#4baddb;fill-opacity:.5;stroke:#a1e4ff;stroke-width:2.5}.anatomy-leader{fill:none;stroke:#72a6b8;stroke-width:1;stroke-dasharray:3 3}.stage-visual .anatomy-label{font-size:10px;letter-spacing:1px;fill:#a4d8eb;font-weight:400}.stage-visual .mouth-label{font-size:17px;fill:#e1f5ff}
.profile-silhouette{fill:#b4d8f1;fill-opacity:.22;stroke:none}.profile-face-outline,.profile-moving-outline{fill:none;stroke:#a6d4f8;stroke-width:2;stroke-linecap:round}.profile-skull{fill:none;stroke:#9fc9ee;stroke-width:2}.profile-brain{fill:#d3eaff;fill-opacity:.22;stroke:#9dbfe3;stroke-width:1.4}.brain-detail,.nasal-detail{fill:none;stroke:#8db5db;stroke-width:1.3}.profile-nasal{fill:#73a9d0;fill-opacity:.45;stroke:#a6d1f5;stroke-width:1.5}.profile-palate,.profile-airway,.profile-epiglottis{fill:none;stroke:#c4e0ff;stroke-width:2.6;stroke-linecap:round}.profile-upper-teeth,.profile-lower-teeth,.profile-spine{fill:#d6e9ff;fill-opacity:.45;stroke:#b0cdeb;stroke-width:1.4}.profile-jaw{fill:#b1d0ec;fill-opacity:.45;stroke:#c6dfff;stroke-width:2}.stage-visual .tongue-shape{fill:#77afd4;fill-opacity:.65;stroke:#c5e0f7;stroke-width:1.8}

#vocal-cord-activity .cord-halo{fill:#ff9b34;fill-opacity:0;stroke:#ff9b34;stroke-width:1.5;opacity:.3;transform-box:fill-box;transform-origin:center}#vocal-cord-activity .cord-vibration{fill:none;stroke:#ff9b34;stroke-width:2.3;stroke-linecap:round;opacity:.55}#vocal-cord-activity .cord-leader{fill:none;stroke:#ff9b34;stroke-width:1;opacity:.55}#vocal-cord-activity .cord-label{font:9px Arial,sans-serif;letter-spacing:.7px;fill:#ffbd70}#vocal-cord-activity.is-vocalizing .cord-halo{fill-opacity:.18;opacity:1;animation:cord-pulse var(--cord-pulse-cycle,.45s) ease-in-out infinite alternate}#vocal-cord-activity.is-vocalizing .cord-vibration{opacity:1;animation:cord-vibrate var(--cord-cycle,.12s) ease-in-out infinite alternate}@keyframes cord-pulse{to{transform:scale(1.3);opacity:.5}}@keyframes cord-vibrate{to{transform:translateY(1.5px)}}@media(prefers-reduced-motion:reduce){#vocal-cord-activity.is-vocalizing .cord-halo,#vocal-cord-activity.is-vocalizing .cord-vibration{animation:none}}

#circuit-diagram svg{width:100%;min-height:250px}#circuit-diagram rect{fill:#153e4f;stroke:#5eced5;stroke-width:1.5}#circuit-diagram text{fill:#e1f5ff;font:600 13px Arial,sans-serif}#circuit-diagram .sub{font:10px Arial,sans-serif;fill:#a4d8eb}#circuit-diagram .block-caption{font:10px Arial,sans-serif;letter-spacing:.3px}#circuit-diagram .block-output path{fill:#153e4f;stroke:#ffae55;stroke-width:2}#circuit-diagram .block-filter rect{stroke:#ffae55}#circuit-diagram .block-fricative,#circuit-diagram .block-noise-wire{opacity:.35}#circuit-diagram .signal-wire{animation:none;stroke-dasharray:none}#circuit-diagram.is-sounding .block-voiced-wire{stroke-dasharray:7 5;animation:block-flow .7s linear infinite}#circuit-diagram.is-sounding .block-voiced rect{stroke:#ffae55;stroke-width:3}@keyframes block-flow{to{stroke-dashoffset:-24}}@media(prefers-reduced-motion:reduce){#circuit-diagram.is-sounding .block-voiced-wire{animation:none}}

.slide-hardware-sample{margin-top:24px;padding-top:16px;border-top:1px solid #dce5e6}.slide-hardware-sample .sample-name{margin:0 0 10px;font-size:14px;color:#123443}.slide-hardware-sample audio{display:block;width:100%;max-width:none;height:40px}

#circuit-diagram #latch-phoneme{font-size:16px;fill:#ffbd70;font-weight:700}#circuit-diagram .latch-flash-a rect{animation:latch-capture-a .7s ease-out}#circuit-diagram .latch-flash-b rect{animation:latch-capture-b .7s ease-out}@keyframes latch-capture-a{0%,35%{fill:#bb7730;stroke:#fff1c9;stroke-width:3}100%{fill:#153e4f;stroke:#5eced5;stroke-width:1.5}}@keyframes latch-capture-b{0%,35%{fill:#bb7730;stroke:#fff1c9;stroke-width:3}100%{fill:#153e4f;stroke:#5eced5;stroke-width:1.5}}@media(prefers-reduced-motion:reduce){#circuit-diagram .latch-flash-a rect,#circuit-diagram .latch-flash-b rect{animation:none}}

#circuit-diagram.is-fricative .block-voiced{opacity:.35}#circuit-diagram.is-fricative .block-fricative{opacity:1}#circuit-diagram.is-fricative.is-sounding .block-fricative rect{stroke:#ffae55;stroke-width:3}#circuit-diagram.is-fricative.is-sounding .block-voiced rect{stroke:#5eced5;stroke-width:1.5}#circuit-diagram.is-fricative .block-noise-wire{opacity:1}#circuit-diagram.is-fricative.is-sounding .block-noise-wire{stroke-dasharray:7 5;animation:block-flow .7s linear infinite}@media(prefers-reduced-motion:reduce){#circuit-diagram.is-fricative.is-sounding .block-noise-wire{animation:none}}

#circuit-diagram .block-noise-wire{opacity:.35!important}#circuit-diagram.is-fricative .block-noise-wire{opacity:1!important}#circuit-diagram.is-fricative .block-voiced-source-wire{opacity:.35}#circuit-diagram.is-sounding:not(.is-fricative) .block-voiced-source-wire{stroke-dasharray:7 5;animation:block-flow .7s linear infinite}@media(prefers-reduced-motion:reduce){#circuit-diagram.is-sounding:not(.is-fricative) .block-voiced-source-wire{animation:none}}

#circuit-diagram.is-fricative .block-filter,#circuit-diagram.is-fricative .block-voiced-wire{opacity:.25}#circuit-diagram.is-fricative.is-sounding .block-voiced-wire{animation:none;stroke-dasharray:none}#circuit-diagram.is-sounding .block-output-wire{stroke-dasharray:7 5;animation:block-flow .7s linear infinite}@media(prefers-reduced-motion:reduce){#circuit-diagram.is-sounding .block-output-wire{animation:none}}

/* Crossfade the illustrated sources and routes with the audio source blend. */
#circuit-diagram .block-voiced,#circuit-diagram .block-fricative,#circuit-diagram .block-filter,#circuit-diagram .block-voiced-wire,#circuit-diagram .block-noise-wire,#circuit-diagram .block-voiced-source-wire{transition:opacity var(--source-fade-time,650ms) ease-in-out}
#circuit-diagram .block-voiced rect,#circuit-diagram .block-fricative rect{transition:stroke var(--source-fade-time,650ms) ease-in-out,stroke-width var(--source-fade-time,650ms) ease-in-out}
#circuit-diagram.is-sounding .block-noise-wire,#circuit-diagram.is-sounding .block-voiced-wire,#circuit-diagram.is-sounding .block-voiced-source-wire{stroke-dasharray:7 5;animation:block-flow .7s linear infinite}
@media(prefers-reduced-motion:reduce){#circuit-diagram .block-voiced,#circuit-diagram .block-fricative,#circuit-diagram .block-filter,#circuit-diagram .block-voiced-wire,#circuit-diagram .block-noise-wire,#circuit-diagram .block-voiced-source-wire,#circuit-diagram .block-voiced rect,#circuit-diagram .block-fricative rect{transition:none}#circuit-diagram.is-sounding .block-noise-wire,#circuit-diagram.is-sounding .block-voiced-wire,#circuit-diagram.is-sounding .block-voiced-source-wire{animation:none}}
.vowel-choices{flex-wrap:wrap}.vowel-choices button{flex:1 1 56px}

.sound-controls #sound-status{margin-bottom:0}.slide-hardware-sample{margin-top:4px}.slide-hardware-sample .sample-name{line-height:1.5}

.history-exhibit-link{color:#087d89;text-decoration:underline;text-underline-offset:3px}.history-exhibit-link:hover{color:#bb6520}.diagram-exhibit-link{fill:#5eced5;text-decoration:underline;cursor:pointer}.diagram-exhibit-link:focus{outline:2px solid #ffae55}

.hardware-sample-heading{margin:0 0 14px;font-size:17px;line-height:1.4;color:#123443}.hardware-recording+.hardware-recording{margin-top:18px}

.phoneme-suggestion{margin-left:auto;align-self:center;font-size:15px;font-weight:700;color:#087d89;line-height:1.4}@media(max-width:600px){.phoneme-suggestion{margin-left:0}}

.history-interactive-intro{font-size:18px;line-height:1.75;max-width:800px;color:#294957}.journey-instruction{font-size:16px;line-height:1.65;color:#355564;margin:28px 0 12px}.journey-instruction+.journey-nav{margin-top:12px}

/* The tour owns the viewport; only its slide body scrolls. */
.start-tour{background:#0e7e8a;color:white;border:0;border-radius:8px;padding:16px 24px;font:inherit;font-weight:700;cursor:pointer;margin:6px 0 20px}.start-tour:focus-visible,.tour-shell button:focus-visible{outline:3px solid #ffae55;outline-offset:3px}
.tour-shell[hidden]{display:none}.tour-shell{position:fixed;inset:0;z-index:10000;background:#f5f3ee;display:flex;flex-direction:column;height:100dvh}.is-history-tour{overflow:hidden}.is-history-tour .history-lead,.is-history-tour .model-note,.is-history-tour .history-references{display:none}
.tour-topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;background:#0c2b3a;color:white;padding:14px max(22px,calc((100vw - 1224px)/2));border-bottom:2px solid #5eced5}.tour-topbar strong{font-size:18px}.tour-topbar button{font:inherit;color:white;background:transparent;border:1px solid #66828e;border-radius:6px;padding:8px 14px;cursor:pointer;white-space:nowrap}
.tour-shell>.journey-nav{flex-shrink:0;max-width:1224px;width:100%;margin:0 auto;padding:12px 22px;box-sizing:border-box;gap:8px}.tour-shell .journey-step{padding:9px 12px;font-size:13px}.tour-scroll{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:12px 22px 24px;scroll-padding-top:16px}.tour-shell .voice-lab{padding:26px;box-sizing:border-box}.tour-shell .stage-copy h2{font-size:30px}.tour-shell .stage-copy p{font-size:16px;line-height:1.65}.tour-shell .stage-visual svg{max-height:360px}.tour-shell .sound-bench{padding:24px 0 0;margin-top:0}.tour-shell>.stage-navigation{flex-shrink:0;max-width:1224px;width:100%;box-sizing:border-box;margin:0 auto;padding:12px 22px max(12px,env(safe-area-inset-bottom));background:#f5f3ee;border-top:1px solid #c7d4d7}.tour-shell .stage-copy h2:focus{outline:none}
@media(max-width:760px){.tour-topbar{padding:10px 16px}.tour-topbar strong{font-size:15px}.tour-topbar button{font-size:13px}.tour-shell>.journey-nav{flex-wrap:nowrap;overflow-x:auto;padding:10px 16px}.tour-shell .journey-step{flex:0 0 auto}.tour-scroll{padding:8px 12px 18px}.tour-shell .voice-lab{display:block;padding:20px}.tour-shell .stage-visual{margin-top:24px}.tour-shell .sound-bench{display:block}.tour-shell .sound-controls{margin-top:20px}.tour-shell>.stage-navigation{padding-left:16px;padding-right:16px}.tour-shell .stage-visual svg{max-height:350px}}

.tour-preview{display:block;width:100%;height:auto;border-radius:12px;margin:22px 0 26px}.history-lead:has(.tour-preview){padding-bottom:50px}

.tour-preview-pair{display:grid;grid-template-columns:minmax(0,1fr) 64px minmax(0,1fr);align-items:center;gap:16px;margin:26px 0}.tour-snapshot{position:relative;overflow:hidden;border-radius:12px;background:#0c2b3a;min-width:0}.tour-snapshot img{position:absolute;top:0;height:100%;max-width:none;display:block}.snapshot-connector{display:flex;align-items:center;justify-content:center;color:#087d89}.snapshot-connector svg{width:54px;height:54px;fill:none;stroke:currentColor;stroke-width:5;stroke-linecap:round;stroke-linejoin:round}@media(max-width:700px){.tour-preview-pair{grid-template-columns:minmax(0,1fr);gap:12px}.snapshot-connector svg{transform:rotate(90deg);width:42px;height:42px}}

.tour-shell .stage-visual svg{margin-top:0}

.tour-animated-preview{display:block;width:100%;max-width:680px;height:auto;margin:28px auto;object-fit:contain}

.tour-animated-pair-image{display:block;width:100%;height:auto;min-width:0;object-fit:contain}

.is-history-tour .site-header{position:fixed;top:0;left:0;right:0;width:100%;z-index:10001}.tour-shell{top:var(--header-height,108px);height:calc(100dvh - var(--header-height,108px))}