/* Ambient: artefact.ist design language. Tokens first, then everything uses them. */

:root {
    /* Editorial Paper Light Theme */
    --bg: #faf9f6;
    --panel-surface: #ffffff;
    --surface-2: #f4f2ed;
    --surface-3: #e8e5de;
    --line: #d6d3cb;
    --line-strong: #84827c;
    --heading: #121215;
    --text: #222227;
    --text-2: #484850;
    --muted: #64646e;
    --accent: #dc261c;
    --accent-hover: #c01c13;
    --on-accent: #ffffff;

    /* Type */
    --font-sans: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

    /* Shape */
    --radius-sm: 4px;
    --radius: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --hairline: 1px solid var(--line);

    /* Motion */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --t-fast: 150ms;

    /* Layout and sizing */
    --max: 1120px;
    --gutter: 20px;
    --gap: 12px;
    --track: 2px;
    --thumb: 14px;
    --target: 44px;
}

.dark {
    /* Obsidian Editorial Dark Theme (Default) */
    --bg: #050506;
    --panel-surface: #0a0a0c;
    --surface-2: #0e0e11;
    --surface-3: #19191e;
    --line: #27272d;
    --line-strong: #52525c;
    --heading: #f4f4f0;
    --text: #d6d6dc;
    --text-2: #a1a1aa;
    --muted: #8a8a94;
    --accent: #f13126;
    --accent-hover: #ff483a;
    --on-accent: #08080a;
}

@media (min-width: 640px) {
    :root {
        --gutter: 32px;
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: var(--on-accent);
}

/* Type */

main h1,
main h2,
main h3 {
    margin: 0;
    font-family: var(--font-sans);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.025em;
    line-height: 0.93;
    color: var(--heading);
}

main h1 {
    font-size: clamp(3rem, 14vw, 8rem);
    letter-spacing: -0.035em;
    margin: 32px 0 16px;
}

main h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: 20px;
}

main h3 {
    font-size: 1.125rem;
    letter-spacing: -0.01em;
}

.accent {
    color: var(--accent);
}

main p {
    margin: 0;
}

.lede {
    max-width: 40ch;
    color: var(--text-2);
    margin-bottom: 32px;
}

main label,
main button,
main select,
.tag,
.wordmark,
footer.site {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

/* Header and footer: content aligned to the same 1120px column as main */

header.site,
footer.site {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap);
    padding-block: 16px;
    padding-inline: max(var(--gutter), calc((100% - var(--max)) / 2 + var(--gutter)));
}

header.site {
    position: sticky;
    top: 0;
    z-index: 10;
    min-height: 64px;
    background: rgba(5, 5, 6, 0.95);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: var(--hairline);
}

footer.site {
    border-top: var(--hairline);
    margin-top: 48px;
    font-size: 0.6875rem;
    color: var(--muted);
}

.wordmark {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.025em;
    text-transform: none;
    color: var(--heading);
}

.wordmark a {
    color: inherit;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: opacity var(--t-fast) var(--ease);
}

.wordmark a:hover {
    opacity: 0.8;
}

.tag {
    font-size: 0.6875rem;
    color: var(--muted);
    background: var(--surface-2);
    border: var(--hairline);
    padding: 4px 10px;
    border-radius: var(--radius);
}

/* Layout */

main {
    display: block;
    width: 100%;
    max-width: var(--max);
    margin: 0 auto 48px;
    padding: 0 var(--gutter);
}

.panel {
    background: var(--panel-surface);
    border: var(--hairline);
    border-radius: var(--radius-lg);
    padding: 20px var(--gutter);
    margin-bottom: 16px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 16px 24px;
}

.row .field {
    flex: 1 1 200px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px 24px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

main label {
    font-size: 0.6875rem;
    color: var(--muted);
}

/* Channel strips: one card per voice, numbered, with label and slider on one row */

#channels {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 8px;
    counter-reset: channel;
}

.strip {
    position: relative;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    column-gap: 10px;
    min-width: 0;
    padding: 12px 12px 14px;
    background: var(--surface-2);
    border: var(--hairline);
    border-radius: var(--radius-md);
    overflow: hidden;
    counter-increment: channel;
    transition: border-color var(--t-fast) var(--ease);
}

.strip:hover {
    border-color: var(--line-strong);
}

.strip h3,
.strip .toggles {
    grid-column: 1 / -1;
}

.strip h3 {
    margin-bottom: 10px;
    overflow-wrap: anywhere;
}

/* Channel number above the name, in the site's mono eyebrow style */
.strip h3::before {
    content: counter(channel, decimal-leading-zero);
    display: block;
    margin-bottom: 6px;
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    color: var(--muted);
}

.strip .toggles {
    margin-bottom: 4px;
}

.strip label {
    font-size: 0.625rem;
    letter-spacing: 0.12em;
}

/* Pan: a faint centre tick behind the slider */
input[type="range"][id^="pan-"] {
    background: linear-gradient(var(--line-strong), var(--line-strong)) 50% 50% / 1px 10px no-repeat;
}

/* Muted: the strip fades back, its buttons stay at full strength */
.strip:has(.mute[aria-pressed="true"]) :is(h3, label, input),
#channels:has(.solo[aria-pressed="true"]) .strip:not(:has(.solo[aria-pressed="true"])) :is(h3, label, input) {
    opacity: 0.4;
}

/* Soloed: the card is outlined in warm white */
.strip:has(.solo[aria-pressed="true"]) {
    border-color: var(--heading);
}

.strip :is(h3, label, input) {
    transition: opacity var(--t-fast) var(--ease);
}

/* Mute and solo side by side */

.toggles {
    display: flex;
    gap: 6px;
}

.toggles button {
    flex: 1 1 0;
    min-width: 0;
    padding: 0 6px;
    letter-spacing: 0.1em;
}

/* Drift switch sits under the scene controls */

.drift-row {
    margin-top: 20px;
}

/* Channel meters: thin accent bar along each strip's bottom edge, width from --meter (0..1),
   sitting on a faint full-width track */

#channels li::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    background: var(--line);
    pointer-events: none;
}

#channels li::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    height: 3px;
    width: calc(var(--meter, 0) * 100%);
    background: var(--accent);
    border-radius: 1px;
    pointer-events: none;
    transition: width 80ms linear;
}

/* Buttons: quiet by default, red for the primary action */

main button {
    appearance: none;
    -webkit-appearance: none;
    min-height: var(--target);
    padding: 0 16px;
    background: var(--surface-2);
    color: var(--text);
    border: var(--hairline);
    border-radius: var(--radius);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    cursor: pointer;
    transition:
        color var(--t-fast) var(--ease),
        background-color var(--t-fast) var(--ease),
        border-color var(--t-fast) var(--ease);
}

main button:hover {
    border-color: var(--line-strong);
    color: var(--heading);
}

main button.primary {
    min-width: 140px;
    background: var(--accent);
    border-color: var(--accent);
    border-radius: var(--radius-md);
    color: var(--on-accent);
}

main button.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: var(--on-accent);
}

main button.primary[aria-pressed="true"] {
    background: var(--heading);
    border-color: var(--heading);
    color: var(--on-accent);
}

main button.mute[aria-pressed="true"] {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--on-accent);
}

main button.solo[aria-pressed="true"] {
    background: var(--heading);
    border-color: var(--heading);
    color: var(--on-accent);
}

#drift {
    min-width: 140px;
}

#drift[aria-pressed="true"] {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--on-accent);
}

/* Select: chevron drawn with gradients (the CSP blocks data: images) */

main select {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    min-height: var(--target);
    padding: 0 36px 0 12px;
    background-color: var(--surface-2);
    background-image:
        linear-gradient(45deg, transparent 50%, var(--muted) 50%),
        linear-gradient(135deg, var(--muted) 50%, transparent 50%);
    background-position:
        calc(100% - 18px) 50%,
        calc(100% - 13px) 50%;
    background-size: 5px 5px;
    background-repeat: no-repeat;
    color: var(--text);
    border: var(--hairline);
    border-radius: var(--radius);
    font-size: 0.8125rem;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition:
        color var(--t-fast) var(--ease),
        border-color var(--t-fast) var(--ease);
}

main select:hover {
    border-color: var(--line-strong);
    color: var(--heading);
}

main select:focus {
    border-color: var(--line);
    box-shadow: none;
}

main option {
    background: var(--surface-2);
    color: var(--text);
    text-transform: none;
}

/* Range sliders: thin hairline track, near-square red thumb */

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    min-height: var(--target);
    margin: 0;
    background: transparent;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: var(--track);
    background: var(--line);
    border: 0;
    border-radius: 1px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: var(--thumb);
    height: var(--thumb);
    margin-top: calc((var(--track) - var(--thumb)) / 2);
    background: var(--accent);
    border: 0;
    border-radius: 2px;
    transition: background-color var(--t-fast) var(--ease);
}

input[type="range"]:hover::-webkit-slider-thumb {
    background: var(--accent-hover);
}

input[type="range"]::-moz-range-track {
    height: var(--track);
    background: var(--line);
    border: 0;
    border-radius: 1px;
}

input[type="range"]::-moz-range-progress {
    height: var(--track);
    background: var(--line-strong);
    border-radius: 1px;
}

input[type="range"]::-moz-range-thumb {
    width: var(--thumb);
    height: var(--thumb);
    background: var(--accent);
    border: 0;
    border-radius: 2px;
    transition: background-color var(--t-fast) var(--ease);
}

input[type="range"]:hover::-moz-range-thumb {
    background: var(--accent-hover);
}

/* Focus */

:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button.primary:focus-visible,
button.mute[aria-pressed="true"]:focus-visible,
#drift[aria-pressed="true"]:focus-visible {
    outline-color: var(--heading);
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
    outline: 2px solid var(--heading);
    outline-offset: 2px;
}

input[type="range"]:focus-visible::-moz-range-thumb {
    outline: 2px solid var(--heading);
    outline-offset: 2px;
}

/* Phone width: everything stacks, no horizontal scroll */

@media (max-width: 480px) {
    main h1 {
        margin-top: 24px;
    }

    .row {
        flex-direction: column;
        align-items: stretch;
    }

    .row .field {
        flex-basis: auto;
    }

    main button.primary {
        width: 100%;
    }

    #channels {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    /* Too narrow for label and slider side by side: stack them */
    .strip {
        grid-template-columns: minmax(0, 1fr);
    }

    .strip label {
        margin-top: 4px;
    }

    footer.site {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 320px) {
    #channels {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    #channels li::after {
        transition: none;
    }
}