:root {
    --tg-theme-bg-color: #212121;
    --tg-theme-text-color: #ffffff;
    --tg-theme-hint-color: #aaaaaa;
    --accent-color: #31b5e7;
    --tg-theme-button-color: #5288c1;
    --tg-theme-button-text-color: #ffffff;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hidden {
    display: none !important;
}

/* --- Стили для стартового экрана --- */
#start-container {
    padding: 20px;
}

.scan-button {
    background-color: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
    border: none;
    border-radius: 8px;
    padding: 15px 30px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.1s ease;
}

.scan-button:active {
    transform: scale(0.95);
}

/* --- Стили для сканера --- */
#scanner-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scanner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scanner-line {
    position: absolute;
    width: 90%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    animation: scan 2.5s infinite linear;
    box-shadow: 0 0 10px var(--accent-color);
}

@keyframes scan {
    0% { top: 15%; }
    50% { top: 85%; }
    100% { top: 15%; }
}

.scanner-corner {
    position: absolute;
    width: 30px;
    height: 30px;
    border: 4px solid var(--accent-color);
}

.top-left { top: 10%; left: 5%; border-right: none; border-bottom: none; }
.top-right { top: 10%; right: 5%; border-left: none; border-bottom: none; }
.bottom-left { bottom: 10%; left: 5%; border-right: none; border-top: none; }
.bottom-right { bottom: 10%; right: 5%; border-left: none; border-top: none; }


/* --- Стили для экрана результата --- */
#output {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2em;
    padding: 20px;
}