/* ============================================================
   AUDIO GRID — Dark Studio Theme
   ============================================================ */

:root {
    /* Color palette */
    --bg-root:        #0a0a0c;
    --bg-transport:   #0f0f13;
    --bg-header:      #111116;
    --bg-rack:        #141418;
    --bg-panel:       #1a1a21;

    /* Amber brand accent */
    --amber:          #f59e0b;
    --amber-60:       rgba(245, 158, 11, 0.60);
    --amber-35:       rgba(245, 158, 11, 0.35);
    --amber-15:       rgba(245, 158, 11, 0.15);
    --amber-08:       rgba(245, 158, 11, 0.08);

    /* Text */
    --fg:             rgb(226, 228, 233);
    --fg-muted:       #9ca3af;
    --fg-subtle:      #747481;

    /* Status */
    --danger:         #ef4444;
    --success:        #22c55e;

    /* Borders */
    --border-hair:    rgba(255, 255, 255, 0.05);
    --border-subtle:  rgba(255, 255, 255, 0.06);
    --border-input:   rgba(255, 255, 255, 0.10);
    --border-amber:   rgba(245, 158, 11, 0.35);

    /* Grid */
    --button-size:    1in;
    --button-gap:     6px;

    /* Type */
    --font-ui: ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    background: var(--bg-root);
    color: var(--fg);
    font-family: var(--font-ui);
    font-size: 11px;
    -webkit-font-smoothing: antialiased;
}

/* ============================================================
   APP SHELL — full viewport column layout
   ============================================================ */

.studio-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

/* ============================================================
   HEADER BAR
   ============================================================ */

.studio-header {
    flex-shrink: 0;
    height: 57px;
    background: var(--bg-header);
    border-bottom: 0.8px solid var(--border-hair);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    gap: 16px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* macOS traffic-light dots */
.traffic-lights {
    display: flex;
    align-items: center;
    gap: 6px;
}
.traffic-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.traffic-dot.red   { background: #ef4444; }
.traffic-dot.amber { background: #f59e0b; }
.traffic-dot.green { background: #22c55e; }

/* App title */
.app-title {
    margin: 0;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--amber);
}

/* Status badge */
.status-badge {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--fg-muted);
}
.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--fg-subtle);
}
.status-dot.active { background: var(--success); }

/* MIDI status text in header */
#midi-status {
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--fg-subtle);
    font-family: var(--font-mono);
}

/* ============================================================
   TRANSPORT STRIP
   ============================================================ */

.transport-strip {
    flex-shrink: 0;
    height: 46px;
    background: var(--bg-transport);
    border-bottom: 0.8px solid var(--border-hair);
    display: flex;
    align-items: stretch;
    justify-content: space-between;
}

.transport-left,
.transport-right {
    display: flex;
    align-items: stretch;
}

/* Transport button — the core strip style */
.transport-btn {
    height: 100%;
    padding: 0 16px;
    border-radius: 0;
    border: none;
    border-right: 1px solid var(--border-subtle);
    background: transparent;
    color: var(--fg-muted);
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}
.transport-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    color: var(--fg);
}
.transport-btn.active {
    background: var(--amber-15);
    color: var(--amber);
}
.transport-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}
.transport-btn svg {
    width: 13px;
    height: 13px;
    flex-shrink: 0;
}

/* Transport label + number input pair */
.transport-field {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 14px;
    border-right: 1px solid var(--border-subtle);
}

.transport-field label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--fg-subtle);
    white-space: nowrap;
    display: block;
    margin: 0;
}

.transport-field input[type="number"] {
    width: 44px;
    height: 24px;
    padding: 0 6px;
    background: var(--bg-panel);
    color: var(--amber);
    border: 0.8px solid var(--border-input);
    border-radius: 2px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 400;
    text-align: center;
    outline: none;
    -moz-appearance: textfield;
}
.transport-field input[type="number"]::-webkit-inner-spin-button,
.transport-field input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
.transport-field input[type="number"]:focus {
    border-color: var(--border-amber);
}

/* Transport hint (right side) */
.transport-hint {
    display: flex;
    align-items: center;
    padding: 0 16px;
    font-size: 10px;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--fg-subtle);
    border-left: 1px solid var(--border-subtle);
}

/* MIDI enable button in header (primary CTA style) */
.btn-cta {
    height: 30px;
    padding: 0 14px;
    border-radius: 2px;
    border: 0.8px solid var(--border-amber);
    background: var(--amber-08);
    color: var(--amber);
    font-family: var(--font-ui);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.15s, border-color 0.15s;
    white-space: nowrap;
}
.btn-cta:hover:not(:disabled) {
    background: var(--amber-15);
}
.btn-cta:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}
.btn-cta svg {
    width: 13px;
    height: 13px;
    flex-shrink: 0;
}

/* ============================================================
   GRID AREA
   ============================================================ */

.grid-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background: var(--bg-root);
    padding: 24px;
}

.button-grid {
    display: grid;
    gap: var(--button-gap);
    grid-template-columns: repeat(var(--grid-cols, 4), var(--button-size));
    grid-template-rows: repeat(var(--grid-rows, 4), var(--button-size));
}

/* Audio button */
.audio-button {
    width: var(--button-size);
    height: var(--button-size);
    border: 1px solid var(--border-input);
    border-radius: 2px;
    background-color: var(--bg-panel);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
    overflow: hidden;
}
.audio-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: background 0.15s;
    pointer-events: none;
}
.audio-button:hover::before {
    background: rgba(255, 255, 255, 0.04);
}
.audio-button:hover {
    border-color: rgba(255, 255, 255, 0.18);
}
@keyframes pulse-amber {
    0%, 100% {
        box-shadow: 0 0 12px rgba(245, 158, 11, 0.28), inset 0 0 18px rgba(245, 158, 11, 0.06);
        border-color: var(--amber);
    }
    50% {
        box-shadow: 0 0 26px rgba(245, 158, 11, 0.58), inset 0 0 30px rgba(245, 158, 11, 0.14);
        border-color: rgba(245, 158, 11, 0.75);
    }
}
.audio-button.playing {
    border-color: var(--amber);
    animation: pulse-amber 1.3s ease-in-out infinite;
}
.waveform-canvas {
    position: absolute;
    top: 6px;
    left: 6px;
    right: 6px;
    width: calc(100% - 12px);
    height: 26px;
    display: none;
    border-radius: 1px;
    pointer-events: none;
}
.audio-button.has-audio .waveform-canvas {
    display: block;
}

.audio-filename {
    font-size: 8px;
    font-weight: 400;
    letter-spacing: 0.06em;
    color: var(--success);
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    width: 88%;
    margin-top: 4px;
    display: none;
    opacity: 0.85;
}
.audio-button.has-audio .audio-filename {
    display: block;
}

.no-audio-hint {
    font-size: 15px;
    font-weight: 200;
    color: var(--fg-subtle);
    opacity: 0.30;
    margin-top: 4px;
    line-height: 1;
    transition: opacity 0.15s;
}
.audio-button:hover .no-audio-hint {
    opacity: 0.55;
}
.audio-button.has-audio .no-audio-hint {
    display: none;
}

.button-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    text-align: center;
    color: var(--fg-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    width: 88%;
    transition: color 0.15s;
}
.audio-button.playing .button-label {
    color: var(--amber);
}

.timer-display {
    position: absolute;
    bottom: 6px;
    right: 6px;
    background: rgba(0, 0, 0, 0.55);
    color: var(--amber);
    border-radius: 2px;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.05em;
    display: none;
    white-space: nowrap;
}

.keyboard-shortcut-indicator {
    position: absolute;
    top: 6px;
    right: 6px;
    background: rgba(0, 0, 0, 0.55);
    color: var(--fg-subtle);
    border: 0.8px solid var(--border-subtle);
    border-radius: 2px;
    padding: 2px 5px;
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.loop-indicator {
    position: absolute;
    bottom: 6px;
    left: 6px;
    background: rgba(0, 0, 0, 0.55);
    color: var(--amber);
    border: 0.8px solid var(--border-amber);
    border-radius: 2px;
    padding: 2px 4px;
    display: flex;
    align-items: center;
    line-height: 1;
}
.loop-indicator svg {
    display: block;
}
.loop-count-label {
    font-size: 9px;
    font-weight: 600;
    line-height: 1;
    margin-left: 3px;
    letter-spacing: 0.02em;
}

.btn-util.active {
    background: var(--amber-15);
    border-color: var(--border-amber);
    color: var(--amber);
}
.btn-util.active:hover {
    background: rgba(245, 158, 11, 0.22);
}

/* ============================================================
   BACKDROP
   ============================================================ */

.backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.70);
    z-index: 999;
    backdrop-filter: blur(2px);
}

/* ============================================================
   SETTINGS MODAL — Rack Module style
   ============================================================ */

.audio-settings {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-rack);
    border: 1px solid var(--border-subtle);
    border-radius: 2px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.60);
    z-index: 1000;
    max-width: 440px;
    width: 90%;
    overflow: hidden;
}

/* Modal header row */
.modal-header {
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border-subtle);
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-title {
    margin: 0;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--amber);
}

/* Close button — icon-only square */
.close-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 0.8px solid var(--border-input);
    border-radius: 0;
    color: var(--fg-subtle);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    padding: 0;
    transition: border-color 0.15s, color 0.15s;
    flex-shrink: 0;
}
.close-btn:hover {
    border-color: var(--border-amber);
    color: var(--amber);
}
.close-btn svg {
    width: 14px;
    height: 14px;
}

/* Modal body */
.modal-body {
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Section within modal */
.rack-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.rack-section + .rack-section {
    border-top: 0.8px solid var(--border-subtle);
    padding-top: 12px;
}

.rack-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--amber-60);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 5px;
}
.rack-label svg {
    width: 11px;
    height: 11px;
    opacity: 0.7;
}

/* Text / URL inputs in modal */
.rack-input {
    width: 100%;
    height: 32px;
    padding: 0 10px;
    background: var(--bg-panel);
    color: var(--fg);
    border: 0.8px solid var(--border-input);
    border-radius: 2px;
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 400;
    outline: none;
    transition: border-color 0.15s;
}
.rack-input:focus {
    border-color: var(--border-amber);
}
.rack-input::placeholder {
    color: var(--fg-subtle);
}

/* File input */
input[type="file"].rack-input {
    height: auto;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 10px;
    color: var(--fg-muted);
}
input[type="file"].rack-input::-webkit-file-upload-button {
    background: var(--bg-panel);
    color: var(--fg-muted);
    border: 0.8px solid var(--border-input);
    border-radius: 2px;
    padding: 3px 8px;
    font-size: 10px;
    font-family: var(--font-ui);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    margin-right: 8px;
}

/* Color input */
input[type="color"].rack-input {
    padding: 2px 4px;
    cursor: pointer;
}

/* Inline row (input + button) */
.rack-row {
    display: flex;
    align-items: center;
    gap: 6px;
}
.rack-row .rack-input {
    flex: 1;
}
.rack-select {
    height: 28px;
    padding: 0 8px;
    border-radius: 2px;
    border: 0.8px solid var(--border-input);
    background: rgba(0, 0, 0, 0.35);
    color: var(--fg);
    font-family: var(--font-ui);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
    padding-right: 22px;
}
.rack-select:focus {
    outline: none;
    border-color: var(--amber-60);
}

/* Secondary utility button */
.btn-util {
    height: 32px;
    padding: 0 12px;
    border-radius: 2px;
    border: 0.8px solid var(--border-input);
    background: rgba(0, 0, 0, 0.25);
    color: var(--fg);
    font-family: var(--font-ui);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background 0.15s, border-color 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
}
.btn-util:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.18);
}
.btn-util svg {
    width: 12px;
    height: 12px;
}

/* Danger / clear variant */
.btn-util.danger {
    border-color: rgba(239, 68, 68, 0.30);
    color: #ef4444;
}
.btn-util.danger:hover {
    background: rgba(239, 68, 68, 0.10);
    border-color: rgba(239, 68, 68, 0.50);
}

/* Primary save button */
.btn-primary {
    width: 100%;
    height: 36px;
    padding: 0 16px;
    border-radius: 2px;
    border: 0.8px solid var(--border-amber);
    background: var(--amber-08);
    color: var(--amber);
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    transition: background 0.15s;
    margin-top: 2px;
}
.btn-primary:hover {
    background: var(--amber-15);
}
.btn-primary svg {
    width: 13px;
    height: 13px;
}

/* MIDI status message */
#midi-status-message {
    font-size: 10px;
    font-family: var(--font-mono);
    color: var(--fg-subtle);
    letter-spacing: 0.05em;
    min-height: 14px;
    transition: color 0.15s;
}
#midi-status-message.ok  { color: var(--success); }
#midi-status-message.err { color: var(--danger); }

/* ============================================================
   TRIM CANVAS
   ============================================================ */

.trim-canvas-wrap {
    position: relative;
    width: 100%;
    height: 54px;
    border: 0.8px solid var(--border-input);
    border-radius: 2px;
    background: var(--bg-panel);
    overflow: hidden;
    cursor: col-resize;
    user-select: none;
}

.trim-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.trim-time-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 4px;
    padding: 0 2px;
}

.trim-time-row span:first-child,
.trim-time-row span:last-child {
    font-size: 9px;
    font-family: var(--font-mono);
    color: var(--success);
    letter-spacing: 0.05em;
    min-width: 36px;
}

.trim-time-row span:last-child {
    text-align: right;
}

/* ============================================================
   UTILITY
   ============================================================ */

.hidden { display: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 600px) {
    :root { --button-size: 0.8in; }
    .transport-hint { display: none; }
    .studio-header { padding: 0 10px; }
}

@media (max-width: 420px) {
    :root { --button-size: 0.65in; }
}