/* Screen-reader only utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================
   RESET & ROOT
   ============================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Spacing scale */
    --xs: 0.25rem;
    --s:  0.5rem;
    --m:  1rem;
    --l:  1.5rem;
    --xl: 2.5rem;

    /* Adaptive UI color — set by JS based on content background brightness */
    --ui-color: 255, 255, 255;

    /* Accent — used only on the Play button when actively playing */
    --accent:       #ffd93d;
    --accent-hover: #ffe970;
    --accent-text:  #1a1400;

    /* Text — all functional text at ≥ 0.65 opacity for legibility */
    --text-primary:   rgba(255, 255, 255, 0.85);
    --text-secondary: rgba(255, 255, 255, 0.70);
    --text-hint:      rgba(255, 255, 255, 0.65);

    /* Surfaces */
    --surface-modal:       #161616;
    --surface-card:        rgba(255, 255, 255, 0.03);
    --surface-input:       rgba(255, 255, 255, 0.05);
    --surface-input-focus: rgba(255, 255, 255, 0.08);
    --surface-ghost:       rgba(255, 255, 255, 0.07);
    --surface-ghost-hover: rgba(255, 255, 255, 0.14);

    /* Borders */
    --border:             rgba(255, 255, 255, 0.08);
    --border-input:       rgba(255, 255, 255, 0.15);
    --border-input-focus: rgba(255, 255, 255, 0.30);

    /* Control panel */
    --controls-bg:     rgba(0, 0, 0, 0.75);
    --controls-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);

    /* HUD */
    --hud-bg: rgba(0, 0, 0, 0.5);

    /* Border radii (px — border properties) */
    --radius-sm:   4px;
    --radius-md:   8px;
    --radius-lg:   12px;
    --radius-xl:   14px;
    --radius-pill: 20px;

    /* Typography */
    --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

    /* Modal design tokens */
    --modal-surface:        #111111;
    --modal-overlay:        rgba(0, 0, 0, 0.85);
    --modal-shadow:         0 0 0 1px rgba(255, 255, 255, 0.10),
                            0 16px 48px rgba(0, 0, 0, 0.85);
    --m-input-bg:           #1e1e1e;
    --m-input-bg-focus:     #222222;
    --m-input-border:       rgba(255, 255, 255, 0.14);
    --m-input-border-focus: #6c8fff;
    --m-text:               #f0f0f0;
    --m-text-secondary:     #aaaaaa;
    --m-text-hint:          #888888;
    --m-text-placeholder:   #666666;
    --m-accent:             #6c8fff;
    --m-accent-text:        #05060f;
    --m-destructive:        #e05555;
    --m-item-bg:            #181818;
    --m-item-bg-hover:      #1f1f1f;
    --m-item-gap:           2px;
}

body {
    font-family: var(--font-ui);
    color: #fff;
    overflow: hidden;
}

/* ============================
   DISPLAY AREA
   ============================ */

#display-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

#content-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 80%;
    max-height: 80%;
    transition: opacity 0ms;
    text-align: center;
    font-weight: bold;
}

#content-display img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
}

/* ============================
   HUD — beat indicator + item counter
   ============================ */

#hud {
    position: absolute;
    top: var(--m);
    left: var(--m);
    display: flex;
    align-items: center;
    gap: var(--s);
    background: var(--hud-bg);
    border-radius: var(--radius-pill);
    padding: var(--xs) var(--s);
    pointer-events: none;
}

#beat-indicator {
    display: flex;
    gap: var(--xs);
    align-items: center;
}

.beat-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(var(--ui-color), 0.2);
    transition: background 100ms;
    flex-shrink: 0;
}

.beat-dot.active {
    background: rgba(var(--ui-color), 0.7);
}

#item-counter {
    font-size: 0.6875rem;
    color: rgba(var(--ui-color), 0.70);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
    white-space: nowrap;
    min-width: 2.5rem;
}

/* ============================
   LOADING INDICATOR
   ============================ */

#loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    z-index: 10;
}

#loading-indicator::after {
    content: '';
    display: block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(var(--ui-color), 0.2);
    border-top-color: rgba(var(--ui-color), 0.8);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================
   CONTROLS TAB — persistent bottom handle
   ============================ */

#controls-tab {
    position: fixed;
    bottom: 0;
    left: var(--m);
    right: var(--m);
    height: 20px;
    z-index: 100;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

#controls-tab::before {
    content: '';
    display: block;
    width: 36px;
    height: 3px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.28);
    border-top: 1px solid rgba(255, 255, 255, 0.35);
    transition: background 0.2s;
}

#controls-tab:hover::before,
#controls-tab:focus::before {
    background: rgba(255, 255, 255, 0.44);
}

#controls-tab:focus {
    outline: none;
}

/* ============================
   CONTROLS PANEL
   ============================ */

#controls {
    position: fixed;
    bottom: 20px;
    left: var(--m);
    right: var(--m);
    display: flex;
    flex-direction: column;
    background: rgba(0, 0, 0, 0.84);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-xl);
    box-shadow: 0 -2px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.07);
    z-index: 90;
    overflow: hidden;
    transform: translateY(calc(100% + 20px));
    transition: transform 0.22s ease-out;
}

#controls.visible {
    transform: none;
}

/* Setup row — collapsed by default, shown when expanded */
#controls-setup-row {
    display: flex;
    align-items: center;
    gap: var(--m);
    padding: 0 var(--m);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    white-space: nowrap;
    max-height: 0;
    opacity: 0;
    pointer-events: none;
    transition: max-height 0.22s ease-out, opacity 0.15s, padding 0.22s ease-out;
}

#controls-setup-row::-webkit-scrollbar { display: none; }

#controls.expanded #controls-setup-row {
    max-height: 4rem;
    opacity: 1;
    padding: var(--s) var(--m);
    pointer-events: auto;
}

/* Transport row — always visible when panel is shown */
#controls-transport-row {
    display: flex;
    align-items: center;
    gap: var(--xs);
    padding: var(--s) var(--m);
    min-height: 3.5rem;
}

/* Volume slider — fills remaining space */
.vol-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 0 var(--s);
}

.vol-wrap input[type="range"] {
    width: 100%;
}

/* Edit / New buttons */
.controls-set-actions {
    display: flex;
    gap: var(--xs);
    flex-shrink: 0;
}

/* Stop, fullscreen, reset — right side of setup row */
.controls-setup-extra {
    display: flex;
    gap: var(--xs);
    flex-shrink: 0;
    margin-left: auto;
}

/* Expand/collapse chevron button */
#controls-expand-btn {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-md);
    flex-shrink: 0;
    color: rgba(var(--ui-color), 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.15s;
}

#controls-expand-btn:hover {
    color: rgba(var(--ui-color), 0.72);
}

.expand-chevron {
    display: block;
    width: 7px;
    height: 7px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(225deg);
    transition: transform 0.22s ease-out;
}

#controls.expanded .expand-chevron {
    transform: rotate(45deg);
}

/* ============================
   BUTTONS — base reset
   ============================ */

button {
    font-family: var(--font-ui);
    font-size: 0.8125rem;
    cursor: pointer;
    border: none;
    background: none;
    color: rgba(var(--ui-color), 0.7);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: color 0.15s, background 0.15s;
}

button:hover {
    color: rgba(var(--ui-color), 1);
}

/* Transport buttons — prev, next */
#prev-item-btn,
#next-item-btn {
    width: 2rem;
    height: 2rem;
    font-size: 1.375rem;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

/* Stop and fullscreen — in setup row */
#stop-btn,
#fullscreen-btn {
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

/* Fullscreen CSS icon — four corner brackets */
.fullscreen-icon {
    display: block;
    width: 11px;
    height: 11px;
    pointer-events: none;
    background:
        linear-gradient(currentColor, currentColor) 0 0 / 3.5px 1.5px no-repeat,
        linear-gradient(currentColor, currentColor) 0 0 / 1.5px 3.5px no-repeat,
        linear-gradient(currentColor, currentColor) 100% 0 / 3.5px 1.5px no-repeat,
        linear-gradient(currentColor, currentColor) 100% 0 / 1.5px 3.5px no-repeat,
        linear-gradient(currentColor, currentColor) 0 100% / 3.5px 1.5px no-repeat,
        linear-gradient(currentColor, currentColor) 0 100% / 1.5px 3.5px no-repeat,
        linear-gradient(currentColor, currentColor) 100% 100% / 3.5px 1.5px no-repeat,
        linear-gradient(currentColor, currentColor) 100% 100% / 1.5px 3.5px no-repeat;
}

/* Play/Pause — primary transport button, largest */
#play-pause-btn {
    width: 3.25rem;
    height: 3.25rem;
    font-size: 1.375rem;
    border-radius: var(--radius-md);
    color: rgba(var(--ui-color), 0.85);
    border: 1px solid var(--border-input);
    background: var(--surface-ghost);
    transition: color 0.15s, background 0.15s, border-color 0.15s;
}

#play-pause-btn:hover {
    color: rgba(var(--ui-color), 1);
    background: var(--surface-ghost-hover);
}

/* Accent: playing state — warm gold */
#play-pause-btn.playing {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
}

#play-pause-btn.playing:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: var(--accent-text);
}

/* Edit / New — text buttons */
#edit-content-btn,
#custom-btn {
    height: 1.75rem;
    padding: 0 var(--s);
    font-size: 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-input);
    background: var(--surface-ghost);
    color: rgba(var(--ui-color), 0.65);
    white-space: nowrap;
}

#edit-content-btn:hover,
#custom-btn:hover {
    color: rgba(var(--ui-color), 0.9);
    background: var(--surface-ghost-hover);
}

/* Reset audio — hidden by default, shown by JS on audio failure */
#reset-audio-btn {
    display: none;
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
    color: rgba(255, 180, 60, 0.8);
    border: 1px solid rgba(255, 160, 60, 0.3);
    flex-shrink: 0;
}

#reset-audio-btn:hover {
    color: rgba(255, 200, 80, 1);
    background: rgba(255, 150, 40, 0.1);
}

#reset-audio-btn.visible {
    display: flex;
}

/* ============================
   SELECTORS & RANGE INPUTS
   ============================ */

.selector-group {
    display: flex;
    flex-direction: column;
    gap: 3px;
    align-items: flex-start;
}

.selector-group label {
    font-size: 0.625rem;
    text-transform: uppercase;
    color: rgba(var(--ui-color), 0.50);
    letter-spacing: 0.08em;
    font-weight: 600;
    white-space: nowrap;
}

select {
    padding: var(--xs) var(--s);
    font-size: 0.6875rem;
    border-radius: 3px;
    border: 1px solid rgba(var(--ui-color), 0.2);
    background: transparent;
    color: rgba(var(--ui-color), 0.80);
    cursor: pointer;
    height: 1.5rem;
    font-family: var(--font-ui);
}

select option {
    background: #1a1a1a;
    color: white;
}

input[type="range"] {
    height: 4px;
    background: rgba(var(--ui-color), 0.2);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin: 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(var(--ui-color), 0.8);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(var(--ui-color), 0.8);
    cursor: pointer;
    border: none;
}

/* ============================
   MODAL — OVERLAY & CONTAINER
   ============================ */

#custom-modal {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.12s ease;
}

@starting-style {
    #custom-modal {
        opacity: 0;
    }
}

#custom-modal-content {
    background: var(--modal-surface);
    box-shadow: var(--modal-shadow);
    border-radius: var(--radius-xl);
    max-width: 760px;
    max-height: 92vh;
    width: 94%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ============================
   MODAL — HEADER
   ============================ */

#modal-header {
    display: flex;
    flex-direction: column;
    gap: var(--xs);
    padding: var(--l);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

#modal-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

#modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--m-text);
    letter-spacing: -0.02em;
}

#modal-mode-hint {
    font-size: 0.8125rem;
    color: var(--m-text-secondary);
    margin: 0;
    line-height: 1.4;
}

#modal-mode-hint:empty {
    display: none;
}

#modal-close-btn {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-md);
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--m-text-secondary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.12s, color 0.12s;
}

#modal-close-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--m-text);
}

/* ============================
   MODAL — BODY
   ============================ */

#modal-body {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: var(--m) var(--l) var(--l);
    display: flex;
    flex-direction: column;
    gap: var(--m);
}

/* ============================
   MODAL — SECTIONS
   ============================ */

/* Default (New mode) section order */
#modal-section-name       { order: 1; }
#modal-section-timing     { order: 2; }
#modal-section-add        { order: 3; }
#modal-section-list       { order: 4; }
#modal-section-appearance { order: 5; }

/* Edit / Fork mode: list comes before add */
[data-mode="edit"] #modal-section-list,
[data-mode="fork"] #modal-section-list  { order: 3; }
[data-mode="edit"] #modal-section-add,
[data-mode="fork"] #modal-section-add   { order: 4; }

.section-header {
    display: flex;
    align-items: center;
    gap: var(--s);
    margin-bottom: var(--s);
}

.section-title {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--m-text-secondary);
    font-weight: 600;
}

.section-count {
    font-size: 0.6875rem;
    color: var(--m-text-hint);
    background: rgba(255, 255, 255, 0.07);
    border-radius: var(--radius-pill);
    padding: 1px var(--s);
}

/* ============================
   MODAL — NAME
   ============================ */

#set-name {
    width: 100%;
    padding: var(--s) var(--m);
    background: var(--m-input-bg);
    border: 1px solid var(--m-input-border);
    border-radius: var(--radius-md);
    color: var(--m-text);
    font-size: 1.125rem;
    font-weight: 500;
    font-family: var(--font-ui);
    letter-spacing: -0.01em;
    transition: border-color 0.12s, background 0.12s;
}

#set-name:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
    background: var(--m-input-bg-focus);
}

#set-name::placeholder {
    color: var(--m-text-placeholder);
    font-weight: 400;
}

/* Compact name in edit/fork mode */
[data-mode="edit"] #set-name,
[data-mode="fork"] #set-name {
    font-size: 0.9375rem;
    font-weight: 400;
    padding: var(--xs) var(--s);
}

/* ============================
   MODAL — TIMING
   ============================ */

#timing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s);
}

/* ============================
   FIELD GROUPS (shared)
   ============================ */

.field-group {
    display: flex;
    flex-direction: column;
    gap: var(--xs);
}

.field-group label {
    font-size: 0.6875rem;
    color: var(--m-text-secondary);
    letter-spacing: 0.02em;
}

.field-hint {
    font-size: 0.6875rem;
    color: var(--m-text-hint);
    line-height: 1.4;
}

.field-group input[type="number"],
.field-group input[type="text"],
.field-group select {
    width: 100%;
    padding: var(--xs) var(--s);
    border-radius: 4px;
    border: 1px solid var(--m-input-border);
    background: var(--m-input-bg);
    color: var(--m-text);
    font-size: 0.8125rem;
    font-family: var(--font-ui);
    transition: border-color 0.12s, background 0.12s;
    height: auto;
}

.field-group input[type="number"]:focus,
.field-group input[type="text"]:focus,
.field-group select:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
    background: var(--m-input-bg-focus);
}

.field-group input::placeholder {
    color: var(--m-text-placeholder);
}

.field-group input[type="number"]::-webkit-inner-spin-button,
.field-group input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
    height: 28px;
    width: 18px;
}

.field-group select option {
    background: var(--modal-surface);
    color: var(--m-text);
}

.field-group--full {
    grid-column: 1 / -1;
}

/* ============================
   MODAL — ADD ITEMS SECTION
   ============================ */

/* Toggle button — hidden in New mode, shown in Edit/Fork */
#add-section-toggle {
    display: none;
    margin-left: auto;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: none;
    color: var(--m-text-secondary);
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: color 0.12s, background 0.12s;
}

[data-mode="edit"] #add-section-toggle,
[data-mode="fork"] #add-section-toggle {
    display: flex;
}

#add-section-toggle:hover {
    color: var(--m-text);
    background: rgba(255, 255, 255, 0.06);
}

/* Collapsible body using grid animation */
#add-section-body {
    display: grid;
    grid-template-rows: 1fr;
    transition: grid-template-rows 0.18s ease, opacity 0.18s ease;
    opacity: 1;
}

#add-section-body.collapsed {
    grid-template-rows: 0fr;
    opacity: 0;
}

#add-section-inner {
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--m);
}

/* ============================
   SHARED IMAGE ZONE
   ============================ */

.img-zone {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: border-color 0.12s, background 0.12s;
}

.img-zone:hover,
.img-zone.dragover {
    border-color: rgba(255, 255, 255, 0.40) !important;
    background: rgba(255, 255, 255, 0.04);
}

.img-zone-thumb {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    z-index: 1;
}

.img-zone-empty {
    font-size: 0.625rem;
    color: rgba(255, 255, 255, 0.35);
    text-align: center;
    pointer-events: none;
    line-height: 1.4;
    user-select: none;
}

.img-zone-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.img-zone.has-image .img-zone-input {
    display: none;
}

.img-zone-remove {
    position: absolute;
    top: 3px;
    right: 3px;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.70);
    border: 1px solid rgba(255, 255, 255, 0.20);
    color: white;
    font-size: 0.875rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 3;
    transition: background 0.12s;
}

.img-zone-remove:hover {
    background: rgba(200, 50, 50, 0.85);
}

/* ============================
   COMPOSER
   ============================ */

#item-composer {
    display: flex;
    gap: var(--s);
    align-items: stretch;
}

#composer-image-zone {
    width: 5rem;
    flex-shrink: 0;
    align-self: stretch;
    min-height: 4.5rem;
    border: 1px dashed rgba(255, 255, 255, 0.22);
    background: rgba(255, 255, 255, 0.02);
}

#composer-fields {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--xs);
}

#composer-text-input {
    width: 100%;
    flex: 1;
    padding: var(--xs) var(--s);
    border-radius: 4px;
    border: 1px solid var(--m-input-border);
    background: var(--m-input-bg);
    color: var(--m-text);
    font-size: 0.875rem;
    font-family: var(--font-ui);
    transition: border-color 0.12s, background 0.12s;
}

#composer-text-input:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
    background: var(--m-input-bg-focus);
}

#composer-text-input::placeholder {
    color: var(--m-text-placeholder);
}

#composer-footer {
    display: flex;
    gap: var(--xs);
}

#composer-beats {
    width: 5rem;
    flex-shrink: 0;
    padding: var(--xs) var(--s);
    border-radius: 4px;
    border: 1px solid var(--m-input-border);
    background: var(--m-input-bg);
    color: var(--m-text);
    font-size: 0.8125rem;
    font-family: var(--font-ui);
    transition: border-color 0.12s;
}

#composer-beats:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
}

#composer-beats::placeholder {
    color: var(--m-text-placeholder);
}

#composer-add-btn {
    flex: 1;
    padding: var(--xs) var(--m);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.06);
    color: var(--m-text);
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: var(--font-ui);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.12s, border-color 0.12s;
    width: auto;
    height: auto;
}

#composer-add-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
}

/* ============================
   BATCH TEXT
   ============================ */

#batch-text-area {
    display: flex;
    flex-direction: column;
    gap: var(--xs);
}

#batch-text-toggle {
    font-size: 0.75rem;
    color: var(--m-text-hint);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-align: left;
    width: auto;
    height: auto;
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-color: rgba(255, 255, 255, 0.18);
    transition: color 0.12s;
}

#batch-text-toggle:hover {
    color: var(--m-text-secondary);
}

/* Grid-based expand/collapse animation */
#batch-text-panel {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.18s ease, opacity 0.18s ease;
    opacity: 0;
}

#batch-text-panel:not(.collapsed) {
    grid-template-rows: 1fr;
    opacity: 1;
}

.batch-panel-inner {
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--xs);
    padding-top: var(--xs);
}

#add-text-input {
    width: 100%;
    padding: var(--s);
    border-radius: var(--radius-md);
    border: 1px solid var(--m-input-border);
    background: var(--m-input-bg);
    color: var(--m-text);
    font-size: 0.8125rem;
    resize: vertical;
    min-height: 4rem;
    font-family: var(--font-ui);
    transition: border-color 0.12s, background 0.12s;
}

#add-text-input:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
    background: var(--m-input-bg-focus);
}

#add-text-input::placeholder {
    color: var(--m-text-placeholder);
}

#batch-text-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s);
}

#add-text-btn {
    padding: var(--xs) var(--s);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: none;
    color: var(--m-text-secondary);
    font-size: 0.75rem;
    font-family: var(--font-ui);
    cursor: pointer;
    white-space: nowrap;
    width: auto;
    height: auto;
    transition: border-color 0.12s, color 0.12s;
}

#add-text-btn:hover {
    border-color: rgba(255, 255, 255, 0.30);
    color: var(--m-text);
}

/* ============================
   CONTENT LIST SECTION
   ============================ */

/* Import button in section header */
#import-set-label {
    margin-left: auto;
    padding: 2px var(--s);
    font-size: 0.6875rem;
    font-family: var(--font-ui);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: none;
    color: var(--m-text-secondary);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    transition: color 0.12s, background 0.12s;
}

#import-set-label:hover {
    color: var(--m-text);
    background: rgba(255, 255, 255, 0.06);
}

#import-set-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

/* Items list */
#content-items-list {
    display: flex;
    flex-direction: column;
    gap: var(--m-item-gap);
    min-height: 2.5rem;
}

.content-items-empty {
    padding: var(--l);
    text-align: center;
}

.empty-state-title {
    font-size: 0.8125rem;
    color: var(--m-text-hint);
    font-weight: 400;
}

/* Content items */
.content-item {
    display: flex;
    align-items: center;
    gap: var(--s);
    padding: var(--s) var(--m);
    background: var(--m-item-bg);
    border-radius: var(--radius-md);
    cursor: move;
    user-select: none;
    -webkit-user-select: none;
    transition: background 0.12s;
    flex-wrap: wrap;
}

.content-item:hover {
    background: var(--m-item-bg-hover);
}

.content-item.dragging {
    opacity: 0.35;
}

/* Drag-and-drop insertion indicator */
.content-item.drop-above {
    box-shadow: 0 -2px 0 0 var(--m-accent);
}

.content-item.drop-below {
    box-shadow: 0 2px 0 0 var(--m-accent);
}

.drag-handle {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.30);
    cursor: grab;
    flex-shrink: 0;
    padding: 0 2px;
    transition: color 0.12s;
    touch-action: none;
}

.drag-handle:active {
    cursor: grabbing;
}

.drag-handle--pulse {
    animation: handlePulse 0.9s ease-in-out 2;
}

@keyframes handlePulse {
    0%   { color: rgba(255, 255, 255, 0.30); }
    50%  { color: rgba(255, 255, 255, 0.70); }
    100% { color: rgba(255, 255, 255, 0.30); }
}

.content-item-preview {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.content-item-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.content-item-info {
    flex: 1;
    font-size: 0.8125rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--m-text);
    min-width: 0;
}

.content-item-info--with-hint {
    display: flex;
    flex-direction: column;
    gap: 2px;
    white-space: normal;
}

.content-item-info--with-hint .content-item-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.content-item-caption-hint {
    font-size: 0.6875rem;
    color: var(--m-text-hint);
    font-style: italic;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.content-item-badge {
    font-size: 0.5625rem;
    padding: 2px 6px;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.07);
    color: #aaa;
    flex-shrink: 0;
    letter-spacing: 0.02em;
}

.content-item-edit {
    background: none;
    border: 1px solid transparent;
    color: var(--m-text-hint);
    cursor: pointer;
    font-size: 0.6875rem;
    font-family: var(--font-ui);
    padding: 3px var(--s);
    border-radius: 4px;
    flex-shrink: 0;
    transition: color 0.12s, background 0.12s, border-color 0.12s;
    white-space: nowrap;
    letter-spacing: 0.01em;
    width: auto;
    height: auto;
}

.content-item-edit:hover {
    color: var(--m-text);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.14);
}

.content-item-delete {
    background: rgba(255, 50, 50, 0.08);
    border: 1px solid rgba(255, 50, 50, 0.20);
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    color: rgba(255, 100, 100, 0.70);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
    padding: 3px 7px;
    width: auto;
    height: auto;
}

.content-item-delete:hover {
    background: rgba(255, 50, 50, 0.20);
    border-color: rgba(255, 50, 50, 0.40);
    color: rgba(255, 140, 140, 1);
}

/* ============================
   INLINE ITEM EDITOR
   ============================ */

.item-editor {
    flex-basis: 100%;
    display: flex;
    align-items: center;
    gap: var(--s);
    padding: var(--s) 0 var(--xs);
    border-top: 1px solid rgba(255, 255, 255, 0.07);
    margin-top: var(--xs);
}

.item-editor .img-zone {
    width: 3rem;
    height: 3rem;
    flex-shrink: 0;
    border: 1px dashed rgba(255, 255, 255, 0.22);
    background: rgba(255, 255, 255, 0.02);
}

.item-editor-text {
    flex: 1;
    min-width: 0;
    padding: var(--xs) var(--s);
    border-radius: 4px;
    border: 1px solid var(--m-input-border);
    background: var(--m-input-bg);
    color: var(--m-text);
    font-size: 0.8125rem;
    font-family: var(--font-ui);
    transition: border-color 0.12s;
}

.item-editor-text:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
}

.item-editor-beats {
    width: 4.5rem;
    flex-shrink: 0;
    padding: var(--xs) var(--s);
    border-radius: 4px;
    border: 1px solid var(--m-input-border);
    background: var(--m-input-bg);
    color: var(--m-text);
    font-size: 0.75rem;
    font-family: var(--font-ui);
    transition: border-color 0.12s;
}

.item-editor-beats:focus {
    outline: none;
    border-color: var(--m-input-border-focus);
}

.item-editor-apply {
    padding: var(--xs) var(--m);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.08);
    color: var(--m-text);
    cursor: pointer;
    font-size: 0.75rem;
    font-family: var(--font-ui);
    flex-shrink: 0;
    white-space: nowrap;
    width: auto;
    height: auto;
    transition: background 0.12s;
}

.item-editor-apply:hover {
    background: rgba(255, 255, 255, 0.16);
}

/* ============================
   APPEARANCE SECTION
   ============================ */

#advanced-settings-toggle {
    display: flex;
    align-items: center;
    gap: var(--s);
    background: none;
    border: none;
    color: var(--m-text-secondary);
    cursor: pointer;
    font-size: 0.6875rem;
    font-family: var(--font-ui);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    padding: 0;
    text-align: left;
    width: auto;
    height: auto;
    transition: color 0.12s;
}

#advanced-settings-toggle:hover {
    color: var(--m-text);
}

.toggle-arrow {
    font-size: 0.5rem;
    transition: transform 0.18s;
    display: inline-block;
}

/* Grid-based expand/collapse */
#advanced-settings {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.18s ease, opacity 0.18s ease;
    opacity: 0;
}

#advanced-settings:not(.collapsed) {
    grid-template-rows: 1fr;
    opacity: 1;
}

.appearance-grid {
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--s);
    padding-top: var(--s);
}

/* Color field: swatch + hex input */
.color-field {
    display: flex;
    align-items: center;
    gap: var(--s);
    border: 1px solid var(--m-input-border);
    border-radius: 4px;
    background: var(--m-input-bg);
    padding: var(--xs) var(--s) var(--xs) var(--xs);
    transition: border-color 0.12s;
}

.color-field:focus-within {
    border-color: var(--m-input-border-focus);
}

.color-field input[type="color"] {
    width: 2rem;
    height: 1.75rem;
    border: none;
    border-radius: 3px;
    background: none;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
}

.color-field input[type="text"] {
    flex: 1;
    border: none;
    background: none;
    color: var(--m-text);
    font-size: 0.8125rem;
    padding: 0;
    min-width: 0;
    font-family: monospace;
}

.color-field input[type="text"]:focus {
    outline: none;
}

/* ============================
   MODAL — FOOTER
   ============================ */

#modal-footer {
    display: flex;
    align-items: center;
    gap: var(--s);
    padding: var(--m) var(--l);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
    background: var(--modal-surface);
}

#modal-footer-spacer {
    flex: 1;
}

#modal-footer button {
    padding: var(--s) var(--m);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-family: var(--font-ui);
    cursor: pointer;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
    width: auto;
    height: auto;
}

/* Delete — destructive */
#delete-custom-btn {
    background: rgba(224, 85, 85, 0.10);
    border: 1px solid rgba(224, 85, 85, 0.25);
    color: var(--m-destructive);
    display: none;
}

#delete-custom-btn:hover {
    background: rgba(224, 85, 85, 0.20);
    border-color: rgba(224, 85, 85, 0.40);
    color: #ef7070;
}

/* Export — secondary */
#export-set-btn {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.14);
    color: var(--m-text-secondary);
    display: none;
}

#export-set-btn:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--m-text);
}

/* Cancel — ghost */
#cancel-custom-btn {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.14);
    color: var(--m-text-secondary);
}

#cancel-custom-btn:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--m-text);
}

/* Create / Save — primary accent */
#create-custom-btn {
    background: var(--m-accent);
    border: 1px solid var(--m-accent);
    color: var(--m-accent-text);
    font-weight: 600;
}

#create-custom-btn:hover {
    filter: brightness(1.12);
}

/* ============================
   RESPONSIVE — DESKTOP (single-row controls)
   ============================ */

@media (min-width: 768px) {
    #controls {
        flex-direction: row;
        align-items: center;
        padding: 0 var(--m);
        min-height: 3.5rem;
    }

    /* Setup row always visible, flows inline — no collapse animation */
    #controls-setup-row {
        max-height: none;
        opacity: 1;
        pointer-events: auto;
        padding: 0;
        border-bottom: none;
        overflow-x: visible;
        white-space: normal;
        transition: none;
        flex-shrink: 0;
    }

    /* Transport row shrinks to fit, no min-height */
    #controls-transport-row {
        padding: 0;
        min-height: 0;
        flex: 1;
    }

    /* Volume constrained — no longer fills all remaining space */
    .vol-wrap {
        flex: 0 0 120px;
        padding: 0 var(--s);
    }

    /* Divider between setup and transport */
    #controls-setup-row {
        border-right: 1px solid rgba(255, 255, 255, 0.08);
        padding-right: var(--m);
        margin-right: var(--xs);
    }

    /* Extra actions move back into setup row naturally */
    .controls-setup-extra {
        margin-left: var(--xs);
    }

    /* Expand button has nothing to expand on desktop — hide it */
    #controls-expand-btn {
        display: none;
    }
}

/* ============================
   RESPONSIVE — MOBILE
   ============================ */

@media (max-width: 600px) {
    #hud {
        top: var(--s);
        left: var(--s);
    }

    /* Controls tab and panel — flush to edges on mobile */
    #controls-tab {
        left: 0;
        right: 0;
    }

    #controls {
        left: 0;
        right: 0;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    }

    /* Setup row scrolls horizontally on mobile — no wrap/stack */
    #controls-setup-row {
        gap: var(--l);
    }

    #edit-content-btn,
    #custom-btn {
        height: 2rem;
    }

    /* Modal */
    #custom-modal-content {
        width: 98%;
        max-height: 96vh;
        border-radius: var(--radius-lg);
    }

    #modal-header {
        padding: var(--m);
    }

    #modal-body {
        padding: var(--s) var(--m) var(--m);
    }

    #modal-footer {
        padding: var(--s) var(--m);
        flex-wrap: wrap;
    }

    #modal-footer button {
        padding: 0.625rem var(--s);
        font-size: 0.75rem;
        min-height: 2.75rem;
    }

    /* Timing: single column on mobile */
    #timing-grid {
        grid-template-columns: 1fr;
    }

    /* Appearance: single column on mobile */
    .appearance-grid {
        grid-template-columns: 1fr;
    }

    /* Composer: stack image zone above fields on mobile */
    #item-composer {
        flex-direction: column;
    }

    #composer-image-zone {
        width: 100%;
        height: 4rem;
        min-height: 0;
    }

    /* Larger drag handle touch target */
    .drag-handle {
        padding: var(--m) var(--s);
        font-size: 1rem;
    }
}