/* Bravura SMuFL font — subset of 212 glyphs used by the renderer.
   local('Bravura') is tried first (fast when system font is installed);
   the WOFF2 URL is the fallback for environments without Bravura installed.
   font-display: block prevents FOUT (invisible text while font loads). */
@font-face {
    font-family: "Bravura";
    src:
        local("Bravura"),
        url("./fonts/Bravura-subset.woff2") format("woff2");
    font-weight: normal;
    font-style: normal;
    font-display: block;
}

/* Global CSS Variables - Harmony & Aesthetics System */
:root {
    --bg-primary: hsl(224, 25%, 8%);
    --bg-secondary: hsl(222, 22%, 12%);
    --bg-tertiary: hsl(222, 20%, 16%);
    --bg-card: hsla(222, 20%, 18%, 0.5);

    --text-primary: hsl(210, 20%, 98%);
    --text-secondary: hsl(210, 14%, 80%);
    --text-muted: hsl(210, 10%, 55%);

    --accent: hsl(260, 85%, 62%);
    --accent-light: hsl(260, 95%, 70%);
    --accent-gradient: linear-gradient(
        135deg,
        hsl(260, 85%, 62%) 0%,
        hsl(290, 80%, 58%) 100%
    );
    --accent-glow: hsla(260, 85%, 62%, 0.4);
    --accent-danger: hsl(342, 85%, 55%);
    --accent-danger-glow: hsla(342, 85%, 55%, 0.4);

    --border-color: hsla(210, 15%, 100%, 0.08);
    --border-focus: hsla(260, 85%, 62%, 0.5);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);

    --glass-bg: rgba(12, 14, 20, 0.7);
    --glass-border: hsla(0, 0%, 100%, 0.06);

    --font-family-ui: "Inter", system-ui, -apple-system, sans-serif;
    --font-family-display: "Outfit", sans-serif;

    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-ui);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    height: 100dvh; /* iOS Safari: updates dynamically as URL bar shows/hides */
    overflow: hidden;
}

/* Layout Structure */
#app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
}

/* Sidebar Styling */
#sidebar {
    width: 340px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-header .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.sidebar-header h1 {
    font-family: var(--font-family-display);
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.sidebar-header h1 span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-footer .license-notice {
    font-size: 11px;
    line-height: 1.5;
    color: var(--text-muted);
}

.sidebar-footer .license-links {
    font-size: 11px;
}

.sidebar-footer .license-links a {
    color: var(--text-muted);
    text-decoration: underline;
}

.sidebar-footer .license-links a:hover {
    color: var(--text-primary);
}

.sidebar-header .subtitle {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    font-weight: 600;
}

/* Sections inside Sidebar */
.section {
    display: flex;
    flex-direction: column;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
}

.section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.section-title {
    font-family: var(--font-family-display);
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.section-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: -6px;
}

/* Score Card */
.score-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.score-card h4 {
    font-family: var(--font-family-display);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.score-card .score-meta {
    font-size: 13px;
    color: var(--text-muted);
}

/* File Dropzone */
.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    cursor: pointer;
    background-color: hsla(222, 22%, 10%, 0.4);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.dropzone:hover,
.dropzone.dragover {
    border-color: var(--accent);
    background-color: hsla(260, 85%, 62%, 0.05);
    box-shadow: 0 0 20px var(--accent-glow);
}

.dropzone.dragover {
    transform: scale(0.98);
}

.upload-icon {
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.dropzone:hover .upload-icon {
    color: var(--accent-light);
    transform: translateY(-2px);
}

.upload-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.upload-desc {
    font-size: 12px;
    color: var(--text-muted);
}

.upload-formats {
    font-size: 10px;
    color: var(--text-muted);
    background-color: var(--bg-primary);
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    margin-top: 4px;
}

/* Spinner & Loader */
#loading-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s infinite linear;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

#loading-text {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Switches & Layout Configurations */
.config-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.toggle-control {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.label-heading {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.label-sub {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
}

/* Slider Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-primary);
    transition: var(--transition-normal);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

input:checked + .slider {
    background-color: var(--accent);
    border-color: var(--accent-light);
}

.switch:has(input:disabled) {
    opacity: 0.5;
    pointer-events: none;
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* Range sliders */
.range-control {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.range-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.range-header #width-val {
    font-size: 12px;
    color: var(--accent-light);
    font-weight: 700;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-light);
    box-shadow: 0 0 8px var(--accent-glow);
    transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Instrument Selection Checklist */
.checkbox-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 200px;
    overflow-y: auto;
    background-color: hsla(222, 22%, 10%, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    font-size: 13px;
}

.checkbox-item input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    border-radius: 5px;
    cursor: pointer;
    position: relative;
    transition: var(--transition-fast);
}

.checkbox-item input[type="checkbox"]:checked {
    background-color: var(--accent);
    border-color: var(--accent-light);
}

.checkbox-item input[type="checkbox"]:checked::after {
    content: "✓";
    position: absolute;
    color: white;
    font-size: 11px;
    font-weight: bold;
    left: 4px;
    top: 1px;
}

.checkbox-item:hover input[type="checkbox"] {
    border-color: var(--accent-light);
}

/* Custom buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-family-ui);
    font-size: 13px;
    font-weight: 600;
    padding: 10px 16px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: var(--transition-normal);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-card);
    border-color: var(--accent);
    box-shadow: 0 0 10px hsla(260, 85%, 62%, 0.15);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 8px;
}

/* Main Display Area */
#main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background-color: var(--bg-primary);
    overflow: hidden;
}

#score-viewport {
    flex-grow: 1;
    overflow: auto;
    display: block;
    padding: 40px;
    padding-bottom: calc(
        140px + env(safe-area-inset-bottom, 0px)
    ); /* offset for floating player + iOS home indicator */
}

/* The score fills the viewport's width: the page is rendered wider than it
   (DESKTOP_RENDER_SCALE / MOBILE_RENDER_SCALE in player.js) and fitted to it,
   so the container must not size itself to the SVG's own width. The empty
   state keeps its compact card. */
#score-canvas-container {
    margin: 0 auto;
    width: 100%;
}

#score-canvas-container:has(.empty-state) {
    width: fit-content;
}

#score-canvas {
    background-color: white;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 30px;
    min-height: 400px;
}

/* Canvas Empty State */
.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 60px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.empty-state svg {
    opacity: 0.4;
}

.empty-state h3 {
    font-family: var(--font-family-display);
    font-size: 18px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 14px;
    max-width: 280px;
}

/* SVG Rendering optimization */
#score-canvas svg {
    display: block;
    width: 100%;
    height: auto;
    user-select: none;
    /* Allow visual pointer events inside but prevent highlights */
    pointer-events: none;
}

/* Dynamic cursor inside SVG */
#score-canvas svg line#playback-cursor {
    pointer-events: none;
    stroke: var(--accent-danger);
    stroke-width: 2.5px;
    stroke-linecap: round;
    filter: drop-shadow(0 0 4px var(--accent-danger-glow));
}

/* Phase 3: Virtual system wrappers */
.system-wrapper {
    display: block;
    overflow: hidden;
    box-sizing: border-box;
}

.system-wrapper svg {
    display: block;
    width: 100%;
    height: auto;
    user-select: none;
    pointer-events: none;
}

/* Floating Audio Media Bar */
#floating-controller {
    position: absolute;
    bottom: max(24px, calc(env(safe-area-inset-bottom, 0px) + 8px));
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 80px);
    max-width: 860px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 12px 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 100;
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUp {
    from {
        transform: translate(-50%, 40px);
        opacity: 0;
    }
    to {
        transform: translate(-50%, 0);
        opacity: 1;
    }
}

/* Scrubber Bar styling */
.timeline-container {
    position: relative;
    width: 100%;
    height: 16px;
    display: flex;
    align-items: center;
    cursor: pointer;
}

.timeline-container input[type="range"] {
    position: absolute;
    width: 100%;
    z-index: 5;
    background: transparent;
    border: none;
    height: 100%;
    margin: 0;
}

.timeline-container input[type="range"]::-webkit-slider-runnable-track {
    background: transparent;
}

.timeline-container input[type="range"]::-webkit-slider-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-danger);
    box-shadow: 0 0 8px var(--accent-danger-glow);
    border: 2px solid white;
}

.timeline-visual-progress {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--accent) 0%,
        var(--accent-danger) 100%
    );
    width: 0%;
    border-radius: 2px;
    pointer-events: none;
    z-index: 2;
}

.timeline-container::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 4px;
    background-color: var(--bg-tertiary);
    border-radius: 2px;
    z-index: 1;
}

/* Controller Layout Buttons */
.controller-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Time counter */
.time-display {
    font-size: 13px;
    font-weight: 700;
    font-family: var(--font-family-display);
    color: var(--text-secondary);
    min-width: 90px;
}

.time-separator {
    color: var(--text-muted);
}

/* Playback buttons */
.playback-controls {
    gap: 16px;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.icon-btn:hover {
    color: var(--text-primary);
    background-color: hsla(210, 15%, 100%, 0.05);
}

/* Main pulsing play button */
.play-pulse-btn {
    background: var(--accent-gradient);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 0 16px var(--accent-glow);
    transition: var(--transition-normal);
}

.play-pulse-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 0 24px var(--accent-light);
}

.play-pulse-btn:active {
    transform: scale(0.96);
}

.play-pulse-btn svg {
    width: 16px;
    height: 16px;
}

.playback-controls #play-btn #play-icon {
    transform: translateX(1px); /* optical alignment */
}

/* Mute & volume slider combined */
.volume-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.volume-container input[type="range"] {
    width: 70px;
}

/* Download containers */
.download-container {
    display: flex;
    gap: 8px;
}

.vertical-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}

/* Horizontal Scrolling Layout Adjustments */
#score-viewport.horizontal-mode {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    overflow-x: auto;
    overflow-y: auto;
}

#score-viewport.horizontal-mode #score-canvas-container {
    margin: 0;
    width: max-content;
}

#score-viewport.horizontal-mode #score-canvas {
    min-height: auto;
    width: max-content;
    padding: 20px 30px;
}

#score-viewport.horizontal-mode #score-canvas svg {
    width: auto;
    height: auto;
}

/* ── Mobile sidebar toggle button ─────────────────────────────────────────── */
#sidebar-toggle {
    display: none; /* hidden on desktop */
}

#sidebar-backdrop {
    display: none; /* hidden on desktop */
}

/* ── Mobile breakpoint ────────────────────────────────────────────────────── */
/* Sidebar as an overlay behind the hamburger toggle: on phones and tablets
   (any orientation; <html class="sidebar-overlay"> is set in index.html) and
   in narrow desktop windows. */
/* Sidebar slides in as an overlay */
html.sidebar-overlay #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 300;
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
    width: 300px;
    box-shadow: none;
}

html.sidebar-overlay #sidebar.sidebar-open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
}

/* Semi-transparent backdrop closes sidebar on tap */
html.sidebar-overlay #sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 299;
    animation: fadeIn 0.2s ease forwards;
}

html.sidebar-overlay #sidebar-backdrop.sidebar-open {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Hamburger toggle button — fixed top-left of main area */
html.sidebar-overlay #sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 200;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

html.sidebar-overlay #sidebar-toggle:hover {
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* Icon swap: hamburger ↔ close */
html.sidebar-overlay #sidebar-toggle .icon-menu {
    display: block;
}
html.sidebar-overlay #sidebar-toggle .icon-close {
    display: none;
}
html.sidebar-overlay #sidebar-toggle.sidebar-open .icon-menu {
    display: none;
}
html.sidebar-overlay #sidebar-toggle.sidebar-open .icon-close {
    display: block;
}

/* Keep the score clear of the hamburger toggle. */
html.sidebar-overlay #score-viewport {
    padding-top: 64px;
}

/* Phones (<html class="is-mobile">): the score fills the screen width. */
html.is-mobile #score-viewport {
    padding-left: 4px;
    padding-right: 4px;
}

html.is-mobile #score-canvas {
    padding: 16px 4px;
    border-radius: 8px;
}

@media (max-width: 768px) {
    /* Keep the end of the score clear of the controller */
    #score-viewport {
        /* controller (~90px, ~140px when the controls wrap) + bottom gap +
           home indicator */
        padding-bottom: calc(160px + env(safe-area-inset-bottom, 0px));
    }

    /* Floating controller: full-width, safe-area-aware bottom */
    #floating-controller {
        width: calc(100% - 24px);
        padding: 10px 10px 14px;
        /* env() lifts the bar above the home indicator; max() ensures minimum
           clearance. The bar already sits above it, so its padding must not
           add the inset again. */
        bottom: max(14px, calc(env(safe-area-inset-bottom, 0px) + 8px));
    }

    /* ── Toolbar: one row under the timeline ─────────────────────────────── */
    /* [time] [rewind + play] [volume] [downloads], compacted to fit a phone; */
    /* on screens too narrow for it the volume and downloads wrap below.     */
    .controller-inner {
        flex-wrap: wrap;
        gap: 10px 8px;
    }

    .time-display {
        flex: 0 0 auto;
        min-width: 0;
        gap: 3px;
        font-size: 11px;
        white-space: nowrap;
    }

    .playback-controls {
        gap: 6px;
    }

    #floating-controller .icon-btn {
        width: 32px;
        height: 32px;
    }

    .utility-controls {
        margin-left: auto;
        gap: 4px;
    }

    /* Dividers take room the row does not have — hide them */
    .vertical-divider {
        display: none;
    }

    .volume-container {
        gap: 4px;
    }

    .volume-container input[type="range"] {
        width: 44px;
    }

    .download-container {
        gap: 4px;
    }

    .download-container .btn-sm {
        padding: 6px 8px;
    }

    /* Sidebar: also respect dynamic viewport height */
    #sidebar {
        height: 100vh;
        height: 100dvh;
    }
}

/* Utility Helpers */
.hidden {
    display: none !important;
}

/* Custom Scrollbar for Sidebar & Viewport */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
    border: 2px solid transparent;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ── While playing: one compact row ───────────────────────────────────────── */
/* Only the timeline, the time and the pause button stay (<html              */
/* class="is-playing">, set in player.js); pausing restores the bar.         */
html.is-playing #floating-controller {
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 4px 6px 4px 16px;
    border-radius: 22px;
}

html.is-playing .timeline-container {
    flex: 1;
    width: auto;
}

html.is-playing .controller-inner {
    flex: 0 0 auto;
    flex-wrap: nowrap;
    gap: 8px;
}

html.is-playing .time-display {
    flex: 0 0 auto;
    min-width: 0;
    gap: 3px;
    font-size: 11px;
    white-space: nowrap;
}

html.is-playing .utility-controls,
html.is-playing #rewind-btn {
    display: none;
}

html.is-playing .playback-controls {
    flex: 0 0 auto;
}