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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #1a1a2e;
    color: #e0e0e0;
}

#puzzle-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: default;
}

/* Toolbar */
#toolbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 44px;
    background: rgba(20, 20, 40, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

#toolbar-left,
#toolbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

#toolbar button {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #e0e0e0;
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: background 0.15s;
}

#toolbar button:hover {
    background: rgba(255, 255, 255, 0.2);
}

#toolbar button:active {
    background: rgba(255, 255, 255, 0.25);
}

#audio-controls {
    display: flex;
    align-items: center;
    gap: 6px;
}

#volume-slider {
    width: 80px;
    accent-color: #6c63ff;
}

#puzzle-dims {
    color: #888;
    font-size: 12px;
}

#badge-complete {
    background: #4caf50;
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Dialogs */
#dialog-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 200;
}

.dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #2a2a4a;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 24px;
    z-index: 300;
    min-width: 360px;
    max-width: 90vw;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.dialog h2 {
    margin-bottom: 16px;
    font-size: 20px;
    color: #fff;
}

.dialog-buttons {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.dialog-buttons button {
    padding: 8px 20px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.15s;
}

.dialog-buttons button:hover {
    background: rgba(255, 255, 255, 0.2);
}

#btn-start-puzzle {
    background: #6c63ff !important;
    border-color: #6c63ff !important;
    color: white !important;
}

#btn-start-puzzle:hover {
    background: #5a52e0 !important;
}

/* Puzzle selection */
#dialog-puzzle-select {
    width: min(900px, 90vw);
}

#preset-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, 100px);
    gap: 8px;
    justify-content: center;
    margin-bottom: 16px;
    max-height: min(400px, 50vh);
    overflow-y: auto;
    padding: 4px;
}

.preset-item {
    position: relative;
    width: 100px;
    height: 75px;
    border-radius: 6px;
    cursor: pointer;
    overflow: visible;
    border: 2px solid transparent;
    transition:
        border-color 0.15s,
        box-shadow 0.15s;
    background: rgba(255, 255, 255, 0.05);
}

.preset-item:hover {
    border-color: rgba(108, 99, 255, 0.5);
    box-shadow: 0 0 8px rgba(108, 99, 255, 0.25);
}

.preset-tooltip {
    position: fixed;
    transform: translate(-50%, -100%);
    margin-top: -6px;
    padding: 4px 8px;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    font-size: 12px;
    white-space: nowrap;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    z-index: 1000;
}

.preset-tooltip.visible {
    opacity: 1;
}

.preset-item.selected {
    border-color: #6c63ff;
    box-shadow: 0 0 12px rgba(108, 99, 255, 0.4);
}

.preset-item input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.preset-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 4px;
}

.preset-thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    color: #555;
    font-size: 20px;
    border-radius: 4px;
}

#custom-url-section {
    padding: 8px 12px;
    margin-bottom: 12px;
}

#custom-url-section label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

#custom-url-input {
    display: block;
    width: 100%;
    margin-top: 8px;
    padding: 8px 10px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.3);
    color: #e0e0e0;
    font-size: 13px;
}

#custom-url-input:disabled {
    opacity: 0.4;
}

#puzzle-options {
    display: flex;
    gap: 20px;
    align-items: center;
    padding: 8px 12px;
}

#puzzle-options label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
}

#piece-count-select {
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.3);
    color: #e0e0e0;
    font-size: 14px;
}

#rotation-checkbox {
    accent-color: #6c63ff;
}

/* Help dialog */
#dialog-help table {
    width: 100%;
    border-collapse: collapse;
}

#dialog-help td {
    padding: 6px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 14px;
}

#dialog-help td:first-child {
    color: #aaa;
    white-space: nowrap;
}

#dialog-help kbd {
    display: inline-block;
    padding: 2px 6px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
}

/* Celebration */
#celebration-overlay {
    position: fixed;
    inset: 0;
    z-index: 150;
    pointer-events: none;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(110vh) rotate(720deg);
        opacity: 0;
    }
}

/* Video play overlay */
#video-play-overlay {
    position: fixed;
    inset: 0;
    z-index: 250;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
}

#btn-play-video {
    padding: 16px 32px;
    font-size: 18px;
    border-radius: 12px;
    border: 2px solid #6c63ff;
    background: rgba(108, 99, 255, 0.3);
    color: white;
    cursor: pointer;
    transition: background 0.2s;
}

#btn-play-video:hover {
    background: rgba(108, 99, 255, 0.5);
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Confirm dialog */
#dialog-confirm p {
    font-size: 15px;
    line-height: 1.5;
}