body {
    overflow-x: hidden;
    margin: 0;
    padding: 0;
    height: 100vh;
    min-height: 100vh;
    max-width: 100%;
    transform: translateZ(0) !important;
    -webkit-transform: translateZ(0) !important;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    position: relative;
    box-sizing: border-box;
}

.exercise-container { display: none; }
.exercise-container.active { display: block; }
.waveform {
    margin: auto;
    width: 200px;
    height: 60px;
    background: #f0f0f0;
    border-radius: 4px;
    overflow: hidden;
}
canvas { width: 100%; height: 100%; }
.word-section {
    text-align: center;
    margin: 16px 0;
}
.score-display {
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: #2e7d32;
    min-height: 1.5em;
    margin: 12px 0;
}
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 12px;
}
/* 右上角计时器 */
#timer-chip {
position: fixed;
top: 16px;
right: 16px;
z-index: 1;
}
.page-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 100;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    perspective: 1000;
    -webkit-perspective: 1000;
}

.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    transition: transform 0.9s cubic-bezier(0.2, 0.8, 0.3, 1), opacity 0.7s cubic-bezier(0.2, 0.8, 0.3, 1);
    transform: translate3d(0, 0, 0);
    opacity: 0;
    z-index: 1;
    will-change: transform, opacity;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    perspective: 1000;
    -webkit-perspective: 1000;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    contain: paint;
}

.page.active {
    transform: translate3d(0, 0, 0);
    opacity: 1;
    z-index: 2;
}

#page1:not(.active) {
transform: translate3d(-100%, 0, 0);
opacity: 0;
}

#page2:not(.active) {
transform: translate3d(100%, 0, 0);
opacity: 0;
}

#data-container {
position: relative;
z-index: 10;
width: 100%;
margin-top: 8px;
}

.user-card {
    display: flex;
    align-items: center;
    padding: 16px;
    border-radius: 8px;
    gap: 12px;
}

.avatar-frame {
    width: 70px;
    height: 70px;
    background-image: url('');
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.info {
    display: flex;
    flex-direction: column;
}

.nickname-line {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nickname {
    font-size: 16px;
    font-weight: bold;
}

.vip-icon {
    width: 50px;
    height: auto;
    vertical-align: middle;
}

.id {
    font-size: 12px;
    color: #666;
    margin-top: 4px;
}

/* 让列表项以 " - " 开头 */
.update-list {
    list-style: none;
    padding-left: 0;
}
.update-list li {
    text-indent: -1em;
    padding-left: 1em;
}
.update-list li::before {
    content: " - ";
    color: inherit;
}

#changelog-content h3,
#changelog-content h4,
#changelog-content p {
margin: 12px 0;
}
#changelog-content h3:first-child {
margin-top: 0;
}

.qr-container {
    position: relative;
    width: 320px;
    height: 256px;
    margin: 0 auto;
    background-image: url('https://teachermate.oss-cn-qingdao.aliyuncs.com/v5jtf-1764931732227-d9fa9fbda07e423c9edd0e54fbcf666e_0_visibleWatermark.png');
    background-size: cover;
    background-position: center;
    text-align: center;
}
#qr-code {
position: absolute;
top: 37%;
left: 50%;
transform: translate(-50%, -50%);
width: 150px;
height: 150px;
}
.corner-img {
    width: 90px;
    position: absolute;
    bottom: 10px;
}
#left-corner {
left: 10px;
}
#right-corner {
right: 10px;
}
#preview-video {
width: 100%;
height: 240px;
background: #000;
border-radius: 8px;
margin: 12px 0;
}
#qrcode-display {
text-align: center;
margin: 12px 0;
}
#qrcode-display canvas, #qrcode-display table {
margin: 0 auto;
max-width: 100%;
}