/* ==========================================================
   Speak & Spell Sampler - Retro 1978 Aesthetic
   Mobile-first responsive design
   ========================================================== */

/* ---------- Color Palette ---------- */
:root {
    /* Orange plastic body */
    --ss-orange: #E85D04;
    --ss-orange-dark: #C44D03;
    --ss-orange-darker: #9D3E02;
    --ss-orange-light: #F48C06;
    --ss-orange-highlight: #FF9E40;

    /* VFD Display */
    --ss-vfd-glow: #00F5D4;
    --ss-vfd-glow-bright: #5CFFF2;
    --ss-vfd-dim: #1A5C52;
    --ss-vfd-off: #0D2E29;
    --ss-vfd-bg: #0A1612;
    --ss-vfd-border: #051210;

    /* Cream/Beige accents */
    --ss-cream: #FAF3E3;
    --ss-cream-dark: #E8DCC8;
    --ss-cream-shadow: #C4B89D;

    /* Shadows and depth */
    --ss-shadow-light: rgba(255, 200, 150, 0.3);
    --ss-shadow-dark: rgba(0, 0, 0, 0.5);
    --ss-shadow-darker: rgba(0, 0, 0, 0.7);

    /* Button colors */
    --ss-btn-face: #F5E6C8;
    --ss-btn-highlight: #FFFBF0;
    --ss-btn-shadow: #B8A07A;
    --ss-btn-active: #E8D8B8;

    /* Sizing */
    --btn-size: 64px;
    --btn-size-mobile: 56px;
    --border-radius: 8px;
    --border-radius-lg: 16px;
}

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

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    background: #212121;
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    -webkit-tap-highlight-color: transparent;
    -webkit-text-size-adjust: 100%;
}

/* ---------- VFD Font ---------- */
.vfd-text {
    font-family: 'VT323', monospace;
    letter-spacing: 0.05em;
}

/* ---------- CRT Burn-in / Ghost Effect ---------- */
.vfd-ghost {
    position: relative;
}

.vfd-ghost::before,
.vfd-ghost::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    color: var(--ss-vfd-dim);
    opacity: 0.3;
    pointer-events: none;
    font-family: inherit;
    font-size: inherit;
    letter-spacing: inherit;
    text-transform: inherit;
    white-space: nowrap;
    overflow: hidden;
}

/* Left ghost - extended tracking */
.vfd-ghost::before {
    letter-spacing: 0.12em;
    filter: blur(1px);
    opacity: 0.2;
    transform: translateX(-2px);
}

/* Right ghost - compressed tracking */
.vfd-ghost::after {
    letter-spacing: 0.02em;
    filter: blur(1.5px);
    opacity: 0.15;
    transform: translateX(2px);
}

/* ---------- Main App Container ---------- */
#app {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    background: transparent;
}

/* ---------- Device Shell (Orange Plastic) ---------- */
#device {
    width: 100%;
    max-width: 500px;
    height: 100%;
    max-height: 900px;
    background: linear-gradient(
        180deg,
        var(--ss-orange-light) 0%,
        var(--ss-orange) 15%,
        var(--ss-orange-dark) 85%,
        var(--ss-orange-darker) 100%
    );
    border-radius: var(--border-radius-lg);
    box-shadow:
        0 8px 16px rgba(0, 0, 0, 0.4),
        0 24px 48px rgba(0, 0, 0, 0.5),
        0 48px 80px rgba(0, 0, 0, 0.4),
        inset 0 2px 0 var(--ss-orange-highlight),
        inset 0 -2px 0 var(--ss-orange-darker);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

/* Texture overlay for plastic feel */
#device::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(
            90deg,
            transparent 0,
            transparent 2px,
            rgba(0,0,0,0.02) 2px,
            rgba(0,0,0,0.02) 4px
        );
    pointer-events: none;
    border-radius: inherit;
}

/* ---------- VFD Display Panel ---------- */
.vfd-panel {
    background: var(--ss-vfd-bg);
    margin: 16px;
    padding: 16px;
    border-radius: var(--border-radius);
    border: 3px solid var(--ss-vfd-border);
    box-shadow:
        inset 0 2px 8px rgba(0,0,0,0.8),
        inset 0 0 20px rgba(0,0,0,0.5),
        0 1px 0 var(--ss-orange-light);
    flex-shrink: 0;
}

/* VFD Title */
#title {
    margin: 0 0 12px 0;
    font-size: 24px;
    color: var(--ss-vfd-glow);
    text-shadow:
        0 0 10px var(--ss-vfd-glow),
        0 0 20px var(--ss-vfd-glow),
        0 0 40px rgba(0, 245, 212, 0.5);
    text-align: center;
    text-transform: uppercase;
}

/* Main Waveform Display */
.waveform-display {
    position: relative;
    width: 100%;
    height: 80px;
    background: var(--ss-vfd-bg);
    border: 2px solid var(--ss-vfd-dim);
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    touch-action: none;
}

#main-waveform {
    width: 100%;
    height: 100%;
    display: block;
    position: relative;
    z-index: 1;
}

#playhead-line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 3px;
    background: #FFFFFF;
    box-shadow:
        0 0 8px var(--ss-vfd-glow),
        0 0 16px var(--ss-vfd-glow),
        0 0 24px var(--ss-vfd-glow-bright);
    left: 0;
    pointer-events: none;
    z-index: 10;
}

/* Loading Overlay */
#loading-overlay {
    position: absolute;
    inset: 0;
    background: var(--ss-vfd-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    z-index: 20;
    transition: opacity 0.4s ease-out;
}

#loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

#loading-overlay .loading-text {
    font-size: 18px;
    color: var(--ss-vfd-glow);
    text-shadow:
        0 0 8px var(--ss-vfd-glow),
        0 0 16px var(--ss-vfd-glow);
    letter-spacing: 0.3em;
    animation: loadingPulse 1.2s ease-in-out infinite;
}

@keyframes loadingPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.loading-bar-track {
    width: 70%;
    max-width: 280px;
    height: 8px;
    background: var(--ss-vfd-off);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--ss-vfd-dim);
}

#loading-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--ss-vfd-dim), var(--ss-vfd-glow));
    box-shadow: 0 0 10px var(--ss-vfd-glow);
    border-radius: 4px;
    transition: width 0.2s ease-out;
}

#loading-status {
    font-size: 14px;
    color: var(--ss-vfd-dim);
    letter-spacing: 0.1em;
}

/* Loading Error State */
#loading-overlay.has-error .loading-text {
    animation: none;
    opacity: 1;
}

#loading-overlay.has-error .loading-bar-track {
    display: none;
}

#loading-overlay .error-face {
    font-size: 32px;
    color: var(--ss-vfd-glow);
    text-shadow: 0 0 10px var(--ss-vfd-glow), 0 0 20px var(--ss-vfd-glow);
    margin-bottom: 8px;
    font-family: 'VT323', monospace;
}

#loading-overlay .error-message {
    font-size: 14px;
    color: var(--ss-vfd-dim);
    text-align: center;
    max-width: 80%;
    line-height: 1.4;
}

/* Progress Container */
#progress-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
}

#progress-container .time {
    font-size: 20px;
    color: var(--ss-vfd-glow);
    text-shadow: 0 0 8px var(--ss-vfd-glow);
    min-width: 50px;
}

#progress-container #elapsed {
    text-align: left;
}

#progress-container #remaining {
    text-align: right;
}

#progress-track {
    flex: 1;
    height: 8px;
    background: var(--ss-vfd-off);
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
}

#progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--ss-vfd-dim), var(--ss-vfd-glow));
    box-shadow: 0 0 8px var(--ss-vfd-glow);
    transition: width 0.1s linear;
}

/* Now Playing */
#now-playing {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

#now-playing .label {
    font-size: 11px;
    color: var(--ss-vfd-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

#track-name {
    font-size: 22px;
    color: var(--ss-vfd-glow);
    text-shadow: 0 0 10px var(--ss-vfd-glow);
    text-transform: uppercase;
}

/* Now Playing Section with Spectrum Analyzer */
#now-playing-section {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#now-playing-section #now-playing {
    margin-top: 0;
}

#spectrum-container {
    width: 100%;
    height: 32px;
    background: var(--ss-vfd-bg);
    border: 1px solid var(--ss-vfd-dim);
    border-radius: 3px;
    overflow: hidden;
}

#spectrum-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ---------- Control Panel ---------- */
.control-panel {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex-shrink: 0;
}

/* Button Group */
.button-group {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* 3D Skeuomorphic Buttons */
.ss-button {
    width: var(--btn-size-mobile);
    height: var(--btn-size-mobile);
    padding: 0;
    border: none;
    border-radius: var(--border-radius);
    background: linear-gradient(
        180deg,
        var(--ss-btn-highlight) 0%,
        var(--ss-btn-face) 20%,
        var(--ss-btn-face) 80%,
        var(--ss-btn-shadow) 100%
    );
    box-shadow:
        0 4px 0 var(--ss-btn-shadow),
        0 6px 8px var(--ss-shadow-dark),
        inset 0 1px 0 var(--ss-btn-highlight),
        inset 0 -1px 0 var(--ss-btn-shadow);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    transition: transform 0.05s, box-shadow 0.05s;
    position: relative;
    user-select: none;
    -webkit-user-select: none;
}

.ss-button:hover {
    background: linear-gradient(
        180deg,
        #FFFDF5 0%,
        var(--ss-btn-highlight) 20%,
        var(--ss-btn-face) 80%,
        var(--ss-btn-shadow) 100%
    );
}

.ss-button:active {
    transform: translateY(3px);
    box-shadow:
        0 1px 0 var(--ss-btn-shadow),
        0 2px 4px var(--ss-shadow-dark),
        inset 0 1px 0 var(--ss-btn-shadow),
        inset 0 -1px 0 var(--ss-btn-highlight);
    background: linear-gradient(
        180deg,
        var(--ss-btn-shadow) 0%,
        var(--ss-btn-active) 20%,
        var(--ss-btn-active) 80%,
        var(--ss-btn-face) 100%
    );
}

.ss-button .icon {
    font-size: 20px;
    color: var(--ss-orange-dark);
    line-height: 1;
}

.ss-button .btn-label {
    font-size: 9px;
    font-weight: 700;
    color: var(--ss-orange-dark);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Loop button active state */
.ss-button.is-active {
    background: linear-gradient(
        180deg,
        var(--ss-vfd-glow) 0%,
        #00D4B8 20%,
        #00D4B8 80%,
        var(--ss-vfd-dim) 100%
    );
    box-shadow:
        0 4px 0 var(--ss-vfd-dim),
        0 6px 8px var(--ss-shadow-dark),
        0 0 15px var(--ss-vfd-glow),
        inset 0 1px 0 var(--ss-vfd-glow-bright);
}

.ss-button.is-active .icon,
.ss-button.is-active .btn-label {
    color: var(--ss-vfd-bg);
}

/* Slider Group */
.slider-group {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.slider-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex: 1;
    max-width: 160px;
}

.slider-control label {
    font-size: 11px;
    font-weight: 700;
    color: var(--ss-cream);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-shadow: 0 1px 2px var(--ss-shadow-dark);
}

.slider-control input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 24px;
    background: transparent;
    cursor: pointer;
}

/* Slider Track */
.slider-control input[type="range"]::-webkit-slider-runnable-track {
    height: 10px;
    background: linear-gradient(
        180deg,
        var(--ss-orange-darker) 0%,
        var(--ss-orange-dark) 50%,
        var(--ss-orange) 100%
    );
    border-radius: 5px;
    border: 2px solid var(--ss-orange-darker);
    box-shadow: inset 0 2px 4px var(--ss-shadow-dark);
}

.slider-control input[type="range"]::-moz-range-track {
    height: 10px;
    background: linear-gradient(
        180deg,
        var(--ss-orange-darker) 0%,
        var(--ss-orange-dark) 50%,
        var(--ss-orange) 100%
    );
    border-radius: 5px;
    border: 2px solid var(--ss-orange-darker);
    box-shadow: inset 0 2px 4px var(--ss-shadow-dark);
}

/* Slider Thumb */
.slider-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    margin-top: -9px;
    background: linear-gradient(
        180deg,
        var(--ss-btn-highlight) 0%,
        var(--ss-cream) 30%,
        var(--ss-cream-dark) 70%,
        var(--ss-cream-shadow) 100%
    );
    border-radius: 50%;
    border: 2px solid var(--ss-cream-shadow);
    box-shadow:
        0 2px 4px var(--ss-shadow-dark),
        inset 0 1px 0 white;
    cursor: grab;
}

.slider-control input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: linear-gradient(
        180deg,
        var(--ss-btn-highlight) 0%,
        var(--ss-cream) 30%,
        var(--ss-cream-dark) 70%,
        var(--ss-cream-shadow) 100%
    );
    border-radius: 50%;
    border: 2px solid var(--ss-cream-shadow);
    box-shadow:
        0 2px 4px var(--ss-shadow-dark),
        inset 0 1px 0 white;
    cursor: grab;
}

.slider-control input[type="range"]:active::-webkit-slider-thumb {
    cursor: grabbing;
}

.slider-control input[type="range"]:active::-moz-range-thumb {
    cursor: grabbing;
}

/* Slider Value Display - cream color to match control panel */
.slider-control .vfd-text {
    font-size: 16px;
    color: var(--ss-cream);
    text-shadow: 0 1px 2px var(--ss-shadow-dark);
    min-width: 50px;
    text-align: center;
}

/* ---------- Playlist Panel ---------- */
.playlist-panel {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    margin: 0 16px 16px 16px;
    background: var(--ss-vfd-bg);
    border-radius: var(--border-radius);
    border: 3px solid var(--ss-vfd-border);
    box-shadow:
        inset 0 2px 8px rgba(0,0,0,0.8),
        0 1px 0 var(--ss-orange-light);
    overflow: hidden;
}

#playlist-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px;
    -webkit-overflow-scrolling: touch;
}

/* Playlist Item */
.playlist-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    margin-bottom: 6px;
    background: rgba(0, 245, 212, 0.03);
    border: 1px solid var(--ss-vfd-dim);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.playlist-item:hover {
    background: rgba(0, 245, 212, 0.08);
    border-color: var(--ss-vfd-glow);
}

.playlist-item.is-active {
    background: rgba(0, 245, 212, 0.12);
    border-color: var(--ss-vfd-glow);
    box-shadow: 0 0 10px rgba(0, 245, 212, 0.3);
}

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

.playlist-item .item-index {
    font-family: 'VT323', monospace;
    font-size: 16px;
    color: var(--ss-vfd-dim);
    min-width: 28px;
}

.playlist-item.is-active .item-index {
    color: var(--ss-vfd-glow);
    text-shadow: 0 0 6px var(--ss-vfd-glow);
}

.playlist-item .item-name {
    flex: 1;
    font-size: 14px;
    color: var(--ss-vfd-glow);
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.playlist-item .item-duration {
    font-family: 'VT323', monospace;
    font-size: 14px;
    color: var(--ss-vfd-dim);
}

.playlist-item.is-active .item-duration {
    color: var(--ss-vfd-glow);
}

/* Drag handle */
.drag-handle {
    font-size: 14px;
    color: var(--ss-vfd-dim);
    cursor: grab;
    padding: 0 6px;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    transition: color 0.15s;
}

.drag-handle:hover {
    color: var(--ss-vfd-glow);
}

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

/* Dragging states */
.playlist-item.is-dragging {
    opacity: 0.4;
    border-style: dashed;
}

.playlist-item.drop-above {
    border-top: 2px solid var(--ss-vfd-glow);
    box-shadow: 0 -4px 8px rgba(0, 245, 212, 0.3);
}

.playlist-item.drop-below {
    border-bottom: 2px solid var(--ss-vfd-glow);
    box-shadow: 0 4px 8px rgba(0, 245, 212, 0.3);
}

/* Drag ghost */
.drag-ghost {
    position: fixed;
    z-index: 1000;
    pointer-events: none;
    opacity: 0.9;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    transform: scale(1.02);
    background: var(--ss-vfd-bg);
    border: 2px solid var(--ss-vfd-glow);
    border-radius: 4px;
}

/* Per-track waveform */
.playlist-item .item-waveform {
    width: 100%;
    height: 24px;
    background: var(--ss-vfd-bg);
    border-radius: 2px;
}

.playlist-item .item-waveform canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ---------- Keyboard Hints (Desktop) ---------- */
#keyboard-hints {
    display: none;
    padding: 8px 16px;
    background: var(--ss-orange-darker);
    border-top: 1px solid var(--ss-orange-dark);
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

#keyboard-hints span {
    font-size: 10px;
    color: var(--ss-cream);
    opacity: 0.7;
    white-space: nowrap;
}

/* ---------- Scrollbar Styling ---------- */
#playlist-scroll::-webkit-scrollbar {
    width: 8px;
}

#playlist-scroll::-webkit-scrollbar-track {
    background: var(--ss-vfd-off);
    border-radius: 4px;
}

#playlist-scroll::-webkit-scrollbar-thumb {
    background: var(--ss-vfd-dim);
    border-radius: 4px;
}

#playlist-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--ss-vfd-glow);
}

/* ---------- Responsive: Tablet & Up ---------- */
@media (min-width: 600px) {
    #app {
        padding: 24px;
    }

    #device {
        max-width: 550px;
        max-height: 950px;
    }

    .vfd-panel {
        margin: 20px;
        padding: 20px;
    }

    #title {
        font-size: 28px;
    }

    .waveform-display {
        height: 100px;
    }

    .ss-button {
        width: var(--btn-size);
        height: var(--btn-size);
    }

    .ss-button .icon {
        font-size: 24px;
    }

    .ss-button .btn-label {
        font-size: 10px;
    }

    .button-group {
        gap: 20px;
    }

    .slider-control {
        max-width: 180px;
    }

    #keyboard-hints {
        display: flex;
    }
}

/* ---------- Responsive: Desktop ---------- */
@media (min-width: 900px) {
    #device {
        max-width: 700px;
        max-height: 1000px;
    }

    .vfd-panel {
        margin: 24px;
        padding: 24px;
    }

    #title {
        font-size: 32px;
        margin-bottom: 16px;
    }

    .waveform-display {
        height: 120px;
    }

    #progress-container {
        margin-top: 16px;
    }

    #progress-container .time {
        font-size: 24px;
    }

    #track-name {
        font-size: 26px;
    }

    /* Spectrum analyzer side-by-side with Now Playing on desktop */
    #now-playing-section {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    #spectrum-container {
        width: 320px;
        height: 48px;
        flex-shrink: 0;
    }

    .control-panel {
        padding: 20px 24px;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .button-group {
        gap: 24px;
    }

    .slider-group {
        gap: 24px;
    }

    .playlist-panel {
        margin: 0 24px 24px 24px;
    }

    #playlist-scroll {
        padding: 12px;
    }

    .playlist-item {
        padding: 12px;
        margin-bottom: 8px;
    }

    .playlist-item .item-waveform {
        height: 30px;
    }
}

/* ---------- Landscape Mobile ---------- */
@media (max-height: 500px) and (orientation: landscape) {
    #device {
        flex-direction: row;
        flex-wrap: wrap;
        max-width: 100%;
        max-height: 100%;
    }

    .vfd-panel {
        flex: 1 1 50%;
        margin: 8px;
        padding: 12px;
    }

    #title {
        font-size: 18px;
        margin-bottom: 8px;
    }

    .waveform-display {
        height: 50px;
    }

    .control-panel {
        flex: 0 0 auto;
        width: 100%;
        flex-direction: row;
        padding: 8px 16px;
        gap: 16px;
        align-items: center;
        justify-content: center;
    }

    .button-group {
        gap: 12px;
    }

    .ss-button {
        width: 48px;
        height: 48px;
    }

    .ss-button .icon {
        font-size: 16px;
    }

    .ss-button .btn-label {
        display: none;
    }

    .playlist-panel {
        flex: 1 1 45%;
        margin: 0 8px 8px 8px;
    }

    #keyboard-hints {
        display: none;
    }
}

/* ---------- Touch Feedback ---------- */
@media (hover: none) {
    .ss-button:hover {
        background: linear-gradient(
            180deg,
            var(--ss-btn-highlight) 0%,
            var(--ss-btn-face) 20%,
            var(--ss-btn-face) 80%,
            var(--ss-btn-shadow) 100%
        );
    }

    .playlist-item:hover {
        background: rgba(0, 245, 212, 0.03);
        border-color: var(--ss-vfd-dim);
    }

    .playlist-item.is-active:hover {
        background: rgba(0, 245, 212, 0.12);
        border-color: var(--ss-vfd-glow);
    }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}