:root {
    --background-color: #212121;
    --text-color: #FFFFFF;
    --primary-color: #BB86FC;
    --primary-variant-color: #03DAC6;
    --surface-color: #303030;
    --control-bg: #424242;
    --border-color: #535353;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --shadow: 0 2px 4px rgba(0,0,0,0.2);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

header {
    padding: 1rem 2rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow);
}

header h1 {
    margin: 0;
    color: var(--primary-color);
}

header p {
    margin: 0.25rem 0 0;
    opacity: 0.8;
}

main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    overflow: hidden;
    min-height: 0; /* Add this to ensure flexbox works correctly in all browsers */
}

#controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 1rem; /* Add margin to space from resizer/canvas */
    box-shadow: var(--shadow);
}

#raw-audio-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: var(--control-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    flex-wrap: wrap; /* Allow wrapping on small screens */
    justify-content: center;
}

#raw-audio-controls.raw-controls-hidden {
    display: none;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem;
    border-radius: 8px;
    flex-wrap: wrap; /* Allow wrapping within a group */
    justify-content: center;
}

.control-subgroup {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.file-upload-group {
    /* Allows this group to be more flexible in layout */
    flex-shrink: 1;
    min-width: 150px; /* Provides a reasonable minimum size */
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    text-align: center;
}

select, input[type="number"] {
    min-width: 75px; /* Give selects and numbers a consistent base width */
    font-size: 1rem;
}

.speed-control-group {
    min-width: 220px;
}

.slider-group {
    min-width: 180px;
    flex-grow: 1;
}

input[type="range"] {
    flex-grow: 1;
    cursor: pointer;
}

input[type="number"] {
    width: 80px;
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    border-radius: 8px;
    font-size: 1rem;
    text-align: right;
    -moz-appearance: textfield; /* Firefox */
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

select {
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-size: 1rem;
}

select:hover {
    background-color: #555;
}

button, .file-label {
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    font-weight: 500;
}

button:hover, .file-label:hover {
    background-color: var(--primary-color);
    color: var(--background-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
}

button:disabled, select:disabled, input[type="number"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

input[type="file"] {
    display: none;
}

#file-name {
    font-style: italic;
    opacity: 0.8;
    word-break: break-all; /* More aggressive word breaking for long names */
    min-width: 0; /* Allow the element to shrink below its content size */
    flex-shrink: 1;
    max-width: 100%; /* Add this to help constrain it in all cases */
    padding: 0 0.5rem;
}

#resizer {
    height: 10px;
    background-color: var(--border-color);
    cursor: ns-resize;
    flex-shrink: 0; /* Prevent the resizer from shrinking */
}

#resizer:hover {
    background-color: var(--primary-variant-color);
}

#canvas-container {
    flex-grow: 1; /* Let canvas take remaining space */
    flex-shrink: 1; /* Allow container to shrink if needed */
    position: relative;
    background-color: #000;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden; /* Ensures canvas corners are rounded */
    display: flex;
    justify-content: center;
    align-items: center;
}

#waterfall-canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
}

#waterfall-canvas:active {
    cursor: grabbing;
}

#placeholder-text {
    position: absolute;
    font-size: 1.5rem;
    color: #555;
    pointer-events: none;
    user-select: none;
}

/* Welcome Screen Styles */
#welcome-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(18, 18, 18, 0.9);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    transition: opacity 0.3s ease;
}

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

.welcome-modal {
    background-color: var(--surface-color);
    padding: 2rem 3rem;
    border-radius: 12px;
    max-width: 700px;
    width: 100%;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    color: var(--text-color);
}

.welcome-modal h2 {
    text-align: center;
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1.5rem;
}

.welcome-section {
    margin-bottom: 1.5rem;
}

.welcome-section h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.warning-section h3 {
    color: #f0ad4e; /* A warning yellow/orange */
}

.tips-section h3 {
    color: #5bc0de; /* A tip blue/cyan */
}

.welcome-modal p, .welcome-modal li {
    line-height: 1.6;
    opacity: 0.9;
}

.welcome-modal ul {
    list-style: none;
    padding-left: 0.5rem;
}

.welcome-modal li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
}

.welcome-modal li::before {
    content: '»';
    position: absolute;
    left: 0;
    color: var(--primary-variant-color);
    font-weight: bold;
}

.welcome-modal code {
    background-color: var(--control-bg);
    color: var(--text-color);
    padding: 0.1em 0.4em;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
}

#welcome-continue-btn {
    display: block;
    width: 100%;
    padding: 0.8rem 1rem;
    margin-top: 2rem;
    background-color: var(--primary-variant-color);
    border-color: transparent;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--background-color);
}

#welcome-continue-btn:hover {
    background-color: var(--primary-color);
    color: var(--background-color);
}

.generate-btn {
    background-color: var(--primary-variant-color);
    color: var(--background-color);
    border: 1px solid var(--primary-variant-color);
    margin-top: 0.5rem;
}

.generate-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--background-color);
}

.ai-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1001;
    display: none;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.ai-modal.visible {
    display: flex;
}

.ai-modal-content {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    max-width: 500px;
    width: 100%;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    color: var(--text-color);
}

.ai-modal-content h3 {
    color: var(--primary-variant-color);
    margin-top: 0;
    margin-bottom: 1.5rem;
    text-align: center;
}

.ai-control-group {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.ai-control-group label {
    font-weight: 500;
    color: var(--text-color);
}

.ai-control-group select,
.ai-control-group input {
    width: 100%;
    box-sizing: border-box;
}

.ai-modal-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.ai-generate-btn {
    background-color: var(--primary-variant-color);
    color: var(--background-color);
    border: 1px solid var(--primary-variant-color);
    flex: 1;
    padding: 0.8rem;
    font-weight: bold;
}

.ai-generate-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.ai-generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.ai-cancel-btn {
    background-color: var(--control-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    flex: 1;
    padding: 0.8rem;
}

.ai-cancel-btn:hover {
    background-color: #555;
}

.generation-status {
    margin-top: 1rem;
    padding: 0.5rem;
    background-color: var(--control-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    font-style: italic;
    opacity: 0.8;
}

.generation-status.generating {
    background-color: #2a4d3a;
    border-color: var(--primary-variant-color);
    opacity: 1;
}

.generation-status.error {
    background-color: #4d2a2a;
    border-color: #ff6b6b;
    color: #ff6b6b;
    opacity: 1;
}

@media (max-width: 768px) {
    body {
        height: auto;
        overflow-y: auto;
        font-size: 16px;
    }
    main {
        padding: 0.5rem;
        flex-direction: column;
    }
    #controls {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    .control-group {
        flex-direction: column;
        gap: 0.75rem;
        padding: 0.75rem;
    }
    .control-subgroup {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
    }
    .file-upload-group {
        text-align: center;
    }
    #file-name {
        max-width: 100%;
        text-align: center;
        font-size: 0.9em;
    }
    header {
        padding: 1rem;
    }
    header h1 {
        font-size: 1.8rem;
    }
    select, input, button, .file-label {
        width: 100%;
        box-sizing: border-box;
        text-align: center;
    }
    input[type="number"] {
        text-align: center;
    }
    .control-group.visual-settings .control-subgroup,
    .control-group.audio-settings .control-subgroup {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    .control-group.audio-settings .slider-group {
        width: 100%;
    }
    .control-group.visual-settings label,
    .control-group.audio-settings label {
        flex-shrink: 0;
    }
}