:root {
    --audio-panel: #0b1117;
    --audio-panel-2: #101923;
    --audio-line: rgba(125, 231, 255, 0.18);
    --audio-muted: #9aa8b5;
    --audio-green: #62e3ad;
    --audio-amber: #ffc45e;
    --audio-red: #ff626f;
}

.audio-navbar {
    position: static;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-surface);
}

.audio-logo { font-size: 1.2rem; }
.tool-name { color: var(--text-muted); font-weight: 400; font-size: 1rem; margin-left: 10px; }

.audio-tool-container {
    width: min(1480px, calc(100% - 32px));
    margin: 0 auto;
    padding: 38px 0 64px;
}

.tool-header {
    max-width: 900px;
    text-align: center;
    margin: 0 auto 28px;
}

.tool-header h1 {
    margin: 10px 0 12px;
    font-size: clamp(2.15rem, 5vw, 4rem);
    line-height: 1.02;
}

.tool-summary {
    max-width: 800px;
    margin: 0 auto 16px;
    color: var(--text-muted);
    font-size: clamp(1rem, 2vw, 1.16rem);
    line-height: 1.6;
}

.tool-boundary {
    max-width: 780px;
    margin: 0 auto;
    padding: 13px 16px;
    border: 1px solid var(--audio-line);
    border-radius: 10px;
    background: rgba(0, 240, 255, 0.035);
    color: var(--audio-muted);
    text-align: left;
    line-height: 1.5;
}

.master-strip {
    position: sticky;
    top: 8px;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 16px;
    padding: 14px 16px;
    border: 1px solid rgba(255, 98, 111, 0.5);
    border-radius: 12px;
    background: rgba(11, 17, 23, 0.96);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(12px);
}

.master-strip > div { display: grid; gap: 4px; }
.master-strip strong { font-family: var(--font-mono); font-size: 0.85rem; }

.eyebrow {
    display: block;
    color: var(--brand-cyan);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.15em;
}

.stop-all,
.primary-action,
.secondary-action,
.small-action,
.quick-action,
.segmented button,
.preset-row button,
.source-tab,
.analyzer-tabs button {
    min-height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font: 700 0.78rem var(--font-mono);
    letter-spacing: 0.035em;
    cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid rgba(0, 240, 255, 0.42);
    outline-offset: 2px;
}

button:disabled,
select:disabled { cursor: not-allowed; opacity: 0.48; }

.stop-all {
    min-width: 190px;
    background: var(--audio-red);
    border-color: var(--audio-red);
    color: #190206;
}

.stop-all:hover { filter: brightness(1.08); }

.global-message {
    margin-bottom: 16px;
    padding: 12px 14px;
    border: 1px solid var(--audio-amber);
    border-radius: 8px;
    background: rgba(255, 196, 94, 0.08);
    color: #ffe3aa;
}

.global-message.error {
    border-color: var(--audio-red);
    background: rgba(255, 98, 111, 0.08);
    color: #ffb2b9;
}

.operator-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.03fr) minmax(430px, 0.97fr);
    gap: 16px;
    align-items: start;
}

.generator-column,
.analyzer-column { display: grid; grid-template-columns: minmax(0, 1fr); min-width: 0; gap: 16px; }

.audio-tool-container [hidden] { display: none !important; }
.audio-tool-container input,
.audio-tool-container select { min-width: 0; max-width: 100%; }
.audio-tool-container .field-note { overflow-wrap: anywhere; }

.analyzer-column {
    position: sticky;
    top: 92px;
}

.rack-card,
.reference-notes {
    border: 1px solid var(--audio-line);
    border-radius: 14px;
    background: linear-gradient(145deg, rgba(16, 25, 35, 0.96), rgba(8, 13, 19, 0.98));
    box-shadow: inset 0 1px rgba(255, 255, 255, 0.025), 0 14px 32px rgba(0, 0, 0, 0.18);
}

.rack-card { padding: 20px; }

.section-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 16px;
}

.section-heading h2,
.reference-notes h2 {
    margin: 4px 0 0;
    font-size: 1.3rem;
    line-height: 1.2;
}

.section-intro { margin: -4px 0 16px; color: var(--audio-muted); }

.state-pill {
    flex: 0 0 auto;
    padding: 5px 8px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    color: var(--audio-muted);
    font: 700 0.66rem var(--font-mono);
    letter-spacing: 0.08em;
}

.state-pill.active { border-color: var(--audio-green); color: var(--audio-green); background: rgba(98, 227, 173, 0.08); }
.state-pill.neutral { border-color: var(--audio-line); color: var(--brand-cyan); }

.quick-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
}

.quick-action {
    display: grid;
    place-content: center;
    gap: 3px;
    min-height: 68px;
    padding: 9px;
    background: rgba(255, 255, 255, 0.025);
}

.quick-action strong { color: var(--brand-cyan); }
.quick-action span { color: var(--audio-muted); font: 400 0.69rem var(--font-mono); letter-spacing: 0; }
.quick-action:hover,
.quick-action.active { border-color: var(--brand-cyan); background: rgba(0, 240, 255, 0.08); }

.inline-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
.primary-action { width: 100%; padding: 10px 14px; background: var(--brand-cyan); border-color: var(--brand-cyan); color: #001217; }
.primary-action:hover { filter: brightness(1.08); }
.secondary-action,
.small-action { padding: 9px 12px; background: rgba(255, 255, 255, 0.035); }
.secondary-action:hover,
.small-action:hover { border-color: var(--brand-cyan); color: var(--brand-cyan); }
.danger-outline { border-color: rgba(255, 98, 111, 0.5); color: #ff9da6; }

.sequence-state {
    margin-top: 10px;
    padding: 10px;
    border-radius: 8px;
    background: var(--brand-cyan);
    color: #001217;
    text-align: center;
    font: 900 1.1rem var(--font-mono);
    letter-spacing: 0.12em;
}

.form-grid { display: grid; gap: 12px; margin-bottom: 14px; }
.two-column { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.three-column { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.form-grid label,
.input-actions label,
.spectrum-options label {
    display: grid;
    gap: 6px;
    color: var(--audio-muted);
    font: 600 0.75rem var(--font-mono);
}

input,
select {
    width: 100%;
    min-height: 44px;
    box-sizing: border-box;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 7px;
    background: rgba(0, 0, 0, 0.32);
    color: var(--text-main);
    font: 500 0.88rem var(--font-mono);
}

input[type="number"],
select { padding: 9px 10px; }

input[type="range"] {
    min-height: 44px;
    accent-color: var(--brand-cyan);
}

.input-with-unit {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 7px;
    background: rgba(0, 0, 0, 0.32);
    overflow: hidden;
}

.input-with-unit input { border: 0; border-radius: 0; background: transparent; }
.input-with-unit > span { padding: 0 10px; color: var(--brand-cyan); font: 700 0.72rem var(--font-mono); }
label output { float: right; color: var(--brand-cyan); }

.preset-row,
.segmented,
.source-tabs,
.analyzer-tabs { display: grid; gap: 7px; }

.preset-row { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-bottom: 14px; }
.preset-row button,
.segmented button,
.source-tab,
.analyzer-tabs button { padding: 8px; background: rgba(255, 255, 255, 0.025); }
.preset-row button:hover,
.segmented button:hover,
.source-tab:hover,
.analyzer-tabs button:hover,
.preset-row button.active,
.segmented button.active,
.source-tab.active,
.analyzer-tabs button.active { border-color: var(--brand-cyan); color: var(--brand-cyan); background: rgba(0, 240, 255, 0.08); }

.button-fieldset { margin: 0 0 10px; padding: 0; border: 0; }
.button-fieldset legend { margin-bottom: 7px; color: var(--audio-muted); font: 600 0.75rem var(--font-mono); }
.routing-controls { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.routing-controls button[data-routing="right-inverted"].active { border-color: var(--audio-amber); color: var(--audio-amber); background: rgba(255, 196, 94, 0.08); }
.field-note,
.measurement-note { color: var(--audio-muted); font-size: 0.78rem; line-height: 1.48; }
.field-note { margin: 9px 0 14px; }
.measurement-note { margin: 14px 0 0; }
.warning-note { padding-left: 10px; border-left: 2px solid var(--audio-amber); color: #dbc79f; }

.source-tabs,
.analyzer-tabs { grid-template-columns: 1fr 1fr; margin-bottom: 14px; }
.source-panel[hidden] { display: none; }
.sweep-presets { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.noise-controls { grid-template-columns: 1fr 1fr; }
.wav-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.privacy-note {
    margin: -4px 0 14px;
    padding: 10px 12px;
    border: 1px solid rgba(98, 227, 173, 0.32);
    border-radius: 8px;
    background: rgba(98, 227, 173, 0.055);
    color: #bcebd7;
    font-size: 0.82rem;
}

.input-actions { display: grid; grid-template-columns: minmax(170px, 0.8fr) minmax(0, 1.2fr); gap: 9px; align-items: end; }
.input-contract { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 14px 0; }
.input-contract > div { min-width: 0; padding: 10px; border: 1px solid rgba(255, 255, 255, 0.09); border-radius: 8px; background: rgba(0, 0, 0, 0.18); }
.input-contract span { display: block; margin-bottom: 4px; color: var(--brand-cyan); font: 700 0.65rem var(--font-mono); letter-spacing: 0.1em; }
.input-contract strong,
.input-contract small { display: block; overflow-wrap: anywhere; }
.input-contract strong { font: 700 0.82rem var(--font-mono); }
.input-contract small { margin-top: 4px; color: var(--audio-muted); line-height: 1.35; }

.meter-toolbar,
.meter-label,
.clip-row,
.correlation-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.meter-toolbar { margin: 18px 0 10px; color: var(--audio-muted); font: 700 0.72rem var(--font-mono); }
.small-action { min-height: 44px; font-size: 0.68rem; }
.meters { display: grid; gap: 11px; }
.meter-label { margin-bottom: 6px; font: 600 0.74rem var(--font-mono); }
.meter-label strong { color: var(--brand-cyan); }
.meter-label span { color: var(--audio-muted); }
.meter-track { position: relative; height: 18px; overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 4px; background: linear-gradient(90deg, #10231f 0 70%, #2a2614 70% 90%, #2d1216 90%); }
.meter-track > span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, #2cb982, var(--audio-green) 70%, var(--audio-amber) 88%, var(--audio-red)); transition: width 75ms linear; }
.clip-line { position: absolute; right: 1.4%; top: 0; bottom: 0; width: 1px; background: rgba(255, 255, 255, 0.6); }
.meter-foot { display: flex; justify-content: space-between; color: #72808d; font: 400 0.58rem var(--font-mono); }
.clip-row { margin: 10px 0 16px; color: var(--audio-muted); font: 600 0.7rem var(--font-mono); }
.clip-indicator { padding: 4px 8px; border: 1px solid rgba(255, 98, 111, 0.25); border-radius: 4px; color: #75424a; }
.clip-indicator.active { border-color: var(--audio-red); background: var(--audio-red); color: #210207; box-shadow: 0 0 15px rgba(255, 98, 111, 0.5); }

.correlation-panel { padding: 11px; border: 1px solid rgba(255, 255, 255, 0.09); border-radius: 8px; background: rgba(0, 0, 0, 0.18); }
.correlation-panel[aria-disabled="true"] { opacity: 0.58; }
.correlation-head { font: 700 0.7rem var(--font-mono); }
.correlation-head output { color: var(--brand-cyan); font-size: 1.1rem; }
.correlation-scale { position: relative; display: flex; justify-content: space-between; margin: 20px 2px 10px; border-top: 2px solid #43515e; color: #85929e; font: 500 0.62rem var(--font-mono); }
.correlation-scale span { transform: translateY(-18px); }
.correlation-scale i { position: absolute; left: 50%; top: -7px; width: 3px; height: 14px; border-radius: 2px; background: var(--brand-cyan); box-shadow: 0 0 9px var(--brand-cyan); transform: translateX(-50%); }
.correlation-panel p { margin: 0; color: var(--audio-muted); font-size: 0.72rem; line-height: 1.4; }

.analyzer-tabs { margin-top: 14px; }
.canvas-frame { position: relative; width: 100%; min-width: 0; box-sizing: border-box; aspect-ratio: 2.15 / 1; min-height: 210px; overflow: hidden; border: 1px solid var(--audio-line); border-radius: 8px; background: #05090d; }
.canvas-frame canvas { display: block; width: 100%; height: 100%; }
.canvas-frame canvas[hidden] { display: none; }
.canvas-frame > span { position: absolute; inset: 0; display: grid; place-items: center; color: #64727e; font: 700 0.75rem var(--font-mono); pointer-events: none; }
.spectrum-options { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }

.system-list { margin: 0 0 14px; }
.system-list > div { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 10px; padding: 8px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.07); }
.system-list dt { color: var(--audio-muted); }
.system-list dd { margin: 0; text-align: right; font-family: var(--font-mono); overflow-wrap: anywhere; }

.reference-notes { margin-top: 16px; padding: 24px; }
.notes-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
.notes-grid > div { padding: 14px; border: 1px solid rgba(255, 255, 255, 0.08); border-radius: 9px; background: rgba(255, 255, 255, 0.018); }
.notes-grid h3 { margin: 0 0 7px; color: var(--brand-cyan); }
.notes-grid p,
.source-links { margin: 0; color: var(--audio-muted); line-height: 1.55; }
.source-links { margin-top: 16px; font-size: 0.82rem; }
.experimental-note { margin-bottom: 10px; color: #ff9aa3; font-size: 0.8rem; }
.cookie-link { font-size: 0.8rem; color: var(--text-muted); text-decoration: none; }
.independent-note { display: block; margin-top: 4px; color: var(--text-muted); font-size: 0.8rem; line-height: 1.45; }

@media (max-width: 1120px) {
    .operator-grid { grid-template-columns: minmax(0, 1fr); }
    .analyzer-column { position: static; grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.6fr); align-items: start; }
}

@media (max-width: 820px) {
    .audio-tool-container { width: min(100% - 24px, 1480px); padding-top: 24px; }
    .quick-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .analyzer-column { grid-template-columns: minmax(0, 1fr); }
    .three-column,
    .wav-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .notes-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
    .audio-tool-container { width: min(100% - 16px, 1480px); padding: 18px 0 42px; }
    .tool-name { display: none; }
    .master-strip { top: 4px; align-items: stretch; flex-direction: column; }
    .stop-all { width: 100%; min-width: 0; }
    .rack-card,
    .reference-notes { padding: 15px; border-radius: 11px; }
    .two-column,
    .three-column,
    .wav-grid,
    .input-actions,
    .input-contract { grid-template-columns: 1fr; }
    .routing-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .preset-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sweep-presets { grid-template-columns: 1fr; }
    .inline-actions { grid-template-columns: 1fr; }
    .canvas-frame { min-height: 190px; }
    .spectrum-options { grid-template-columns: 1fr 1fr; }
}

@media (max-height: 460px) and (orientation: landscape) {
    .master-strip { position: static; }
    .tool-header { margin-bottom: 18px; }
    .tool-header h1 { font-size: 2rem; }
    .audio-tool-container { padding-top: 16px; }
}

@media (prefers-reduced-motion: reduce) {
    .meter-track > span { transition: none; }
}