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

:root {
    --bg: #121212;
    --container-bg: #1e1e1e;
    --text: #e0e0e0;
    --text-muted: #aaa;
    --border: #333;
    --card-bg: #2a2a2a;
    --dialog-bg: #1e1e1e;
    --error-bg: #3b1a1a;
    --error-border: #7a2a2a;
    --error-text: #f88;
}

body.light {
    --bg: #f5f5f5;
    --container-bg: #fff;
    --text: #333;
    --text-muted: #666;
    --border: #ddd;
    --card-bg: #f9f9f9;
    --dialog-bg: #fff;
    --error-bg: #fee;
    --error-border: #fcc;
    --error-text: #c33;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg);
    color: var(--text);
    padding: 20px;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--container-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.4);
}

h1 {
    text-align: center;
    color: var(--text);
    margin-bottom: 10px;
}

h2 {
    color: var(--text-muted);
    margin-bottom: 15px;
    font-size: 1.2em;
}

#header-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

#about-button {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 6px 14px;
    font-size: 0.85em;
    border-radius: 20px;
    cursor: pointer;
    width: auto;
}

.about-info {
    margin-bottom: 20px;
    line-height: 1.8;
    color: var(--text);
}

.about-info a {
    color: #2196F3;
}

#about-close-button {
    width: 100%;
    background: #4CAF50;
    color: white;
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#about-close-button:hover {
    background: #45a049;
}

#theme-toggle {
    display: block;
    margin: 0 auto 20px;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 6px 14px;
    font-size: 0.85em;
    border-radius: 20px;
    cursor: pointer;
    width: auto;
}

.error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.error.hidden {
    display: none;
}

#scanner-container {
    position: relative;
    width: 100%;
    max-width: 640px;
    margin: 0 auto 20px;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
}

#video {
    width: 100%;
    height: auto;
    display: block;
}

#controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px;
}

button {
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
}

#start-button {
    background: #4CAF50;
    color: white;
}

#start-button:hover:not(:disabled) {
    background: #45a049;
}

#stop-button {
    background: #f44336;
    color: white;
}

#stop-button:hover:not(:disabled) {
    background: #da190b;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#results {
    margin-top: 30px;
}

#scanned-codes {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.scanned-code {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.scanned-code strong {
    font-size: 1.2em;
    color: var(--text);
    font-family: 'Courier New', monospace;
    flex: 1 1 100%;
}

.scanned-code .format {
    background: #2196F3;
    color: white;
    padding: 4px 8px;
    border-radius: 3px;
    font-size: 0.85em;
    text-transform: uppercase;
}

.scanned-code .timestamp {
    color: var(--text-muted);
    font-size: 0.9em;
}

.dialog {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.dialog.hidden {
    display: none;
}

.dialog-content {
    background: var(--dialog-bg);
    padding: 30px;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.dialog-content h2 {
    margin-bottom: 20px;
    color: var(--text);
}

#dialog-info {
    margin-bottom: 20px;
}

.cd-info {
    margin: 10px 0;
    font-size: 1em;
    line-height: 1.6;
    color: var(--text);
}

#scan-another-button {
    width: 100%;
    background: #4CAF50;
    color: white;
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#scan-another-button:hover {
    background: #45a049;
}

#append-sheet-button {
    width: 100%;
    background: #2196F3;
    color: white;
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 10px;
}

#append-sheet-button:hover:not(:disabled) {
    background: #0b7dda;
}

#append-sheet-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.product-info {
    flex: 1 1 100%;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.95em;
}

.product-info div {
    margin: 5px 0;
}

@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 15px;
    }

    #controls {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
}