.kdc-container-1252163e {
    --kdc-bg: #ffffff;
    --kdc-text: #222222;
    --kdc-card-bg: #f8f9fa;
    --kdc-primary: #2A9D8F;
    --kdc-border: #e9ecef;
    --kdc-shadow: rgba(0,0,0,0.1);
    
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans KR", sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background: var(--kdc-bg);
    color: var(--kdc-text);
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--kdc-shadow);
    transition: background-color 0.3s, color 0.3s;
}

.kdc-container-1252163e.kdc-dark {
    --kdc-bg: #1e1e1e;
    --kdc-text: #f0f0f0;
    --kdc-card-bg: #2d2d2d;
    --kdc-border: #444444;
    --kdc-shadow: rgba(0,0,0,0.5);
}

.kdc-btn {
    appearance: none;
    border: 1px solid var(--kdc-border);
    background: var(--kdc-card-bg);
    color: var(--kdc-text);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
    font-family: inherit;
}
.kdc-btn:hover {
    background: var(--kdc-border);
}

.kdc-top-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
    justify-content: center;
}

.kdc-status-bar {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 5px;
    font-weight: 500;
}

.kdc-progress-bar-bg {
    width: 100%;
    height: 8px;
    background: var(--kdc-border);
    border-radius: 4px;
    margin-bottom: 20px;
    overflow: hidden;
}
.kdc-progress-bar-fill {
    height: 100%;
    background: var(--kdc-primary);
    width: 0%;
    transition: width 0.3s ease;
}

.kdc-card-area {
    position: relative;
    width: 100%;
    height: 300px;
    margin-bottom: 20px;
}

.kdc-card-scene {
    perspective: 1000px;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.kdc-card {
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
    transform-style: preserve-3d;
    position: relative;
}

.kdc-card.kdc-flipped {
    transform: rotateY(180deg);
}

.kdc-card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    box-sizing: border-box;
    background: var(--kdc-card-bg);
    border: 1px solid var(--kdc-border);
    border-radius: 12px;
    box-shadow: 0 4px 10px var(--kdc-shadow);
    font-size: 1.8rem;
    font-weight: bold;
    text-align: center;
    word-break: keep-all;
    line-height: 1.4;
}

.kdc-card-back {
    transform: rotateY(180deg);
    font-size: 1.5rem;
    font-weight: normal;
}

.kdc-bottom-controls {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}
.kdc-bottom-controls .kdc-btn {
    flex: 1;
    padding: 12px;
    font-size: 1rem;
    font-weight: bold;
}
.kdc-btn-dont-know { border-color: #e63946; color: #e63946; }
.kdc-btn-know { border-color: var(--kdc-primary); color: var(--kdc-primary); }
.kdc-container-1252163e.kdc-dark .kdc-btn-dont-know { color: #ff6b6b; border-color: #ff6b6b; }
.kdc-container-1252163e.kdc-dark .kdc-btn-know { color: #4ade80; border-color: #4ade80; }

.kdc-end-screen {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--kdc-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    z-index: 10;
    border: 1px solid var(--kdc-border);
    border-radius: 12px;
}
.kdc-end-screen h3 { margin: 0 0 10px; font-size: 1.8rem; color: var(--kdc-text); }
.kdc-end-screen p { font-size: 1.2rem; margin-bottom: 20px; }
.kdc-btn-restart { padding: 12px 24px; font-size: 1.1rem; background: var(--kdc-primary); color: #fff; border: none; }