* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    background-color: #1e293b;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* 顶部设置栏 */
#control-panel {
    background-color: #0f172a;
    color: #fff;
    padding: 0 20px;
    display: flex;
    gap: 12px;
    align-items: center;
    font-size: 14px;
    height: 60px;
    z-index: 100;
    border-bottom: 1px solid #334155;
}
#control-panel input {
    background: #334155;
    border: 1px solid #475569;
    color: #fff;
    padding: 4px 8px;
    width: 55px;
    border-radius: 4px;
    text-align: center;
}
.btn {
    color: #fff;
    border: none;
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
}
.btn-blue { background: #2563eb; }
.btn-blue:hover { background: #1d4ed8; }
.btn-op { font-size: 22px; padding: 2px 16px; }
.btn-op-plus { background: #eab308; }
.btn-op-plus:hover { background: #ca8a04; }
.btn-op-minus { background: #ef4444; }
.btn-op-minus:hover { background: #dc2626; }
.btn-lock { background: #e2e8f0; color: #1e293b; }
.btn-lock:hover { background: #cbd5e1; }

#canvas {
    flex: 1;
    position: relative;
    width: 100%;
    padding: 24px;
}
/* 等比配套缩放的虚线参考网格 */
.grid-overlay {
    position: absolute;
    top: 24px; left: 24px;
    width: calc(100% - 48px);
    height: calc(100% - 48px);
    display: grid;
    pointer-events: none;
}
.grid-cell {
    border: 2px dashed rgba(255, 255, 255, 0.3);
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    width: 100%;
    height: 100%;
}

/* 学生卡片 UI（精简版） */
.student-card {
    position: absolute;
    background-color: #ffffff;
    border-radius: 8px;
    padding: 6px 10px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    cursor: move;
    user-select: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    z-index: 10;
}

/* 7A / 8B 基础边框样式 */
.card-7A { border: 3px solid #f97316; }
.card-8B { border: 3px solid #0284c7; }

/* 选中外发光 */
.student-card.selected {
    box-shadow: 0 0 15px #94a3b8, 0 4px 10px rgba(0, 0, 0, 0.4);
    border-color: #94a3b8 !important;
}
.card-7A.selected {
    box-shadow: 0 0 15px #f97316, 0 4px 10px rgba(0, 0, 0, 0.4);
    border-color: #f97316 !important;
}
.card-8B.selected {
    box-shadow: 0 0 15px #0284c7, 0 4px 10px rgba(0, 0, 0, 0.4);
    border-color: #0284c7 !important;
}

/* 锁定状态：仅外观变灰，依然允许被鼠标选中 */
.student-card.locked {
    background-color: #e2e8f0 !important;
    opacity: 0.7;
}
.student-card.locked .info-name,
.student-card.locked .student-score {
    color: #64748b !important;
}

/* 内部层级布局 */
.card-top-status {
    position: absolute;
    top: -10px;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    gap: 4px;
    flex-wrap: wrap;
    pointer-events: auto;
    z-index: 20;
}
.status-empty { 
    display: none;
}
.status-text {
    font-size: 11px;
    color: #000000;
    background-color: #fde047;
    padding: 2px 6px;
    border-radius: 2px;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.3);
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    font-style: normal;
    font-weight: bold;
    transition: all 0.1s;
}
.status-text:hover {
    background-color: #fef08a;
    transform: scale(1.05);
}

/* 下部排版（左侧单行姓名，右侧大分数） */
.card-bottom-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    flex: 1;
}
.info-left-box {
    display: flex;
    align-items: center;
    flex: 1;
    overflow: hidden;
    position: relative;
}
.info-id {
    position: absolute;
    left: -2px;
    top: 50%;
    transform: translateY(-50%);
    font-weight: 900;
    color: #e2e8f0;
    z-index: 1;
    pointer-events: none;
    line-height: 0.8;
    letter-spacing: -2px;
}
.info-name {
    font-weight: 900;
    color: #0f172a;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    z-index: 2;
    position: relative;
    padding-left: 8px;
}
.student-score {
    font-weight: 900;
    color: #0f172a;
    line-height: 1;
    text-align: right;
    padding-left: 5px;
    transition: all 0.3s ease;
}
.score-glow {
    color: #0f172a;
    text-shadow: 0 0 12px rgba(253, 224, 71, 1), 0 0 20px rgba(234, 179, 8, 0.8);
}

/* 右上角圆形消息气泡 */
.status-badge {
    position: absolute;
    top: -9px; right: -9px;
    background-color: #ff0000;
    color: #ffffff;
    font-size: 10px;
    font-weight: bold;
    width: 20px; height: 20px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid #fff;
    z-index: 10;
}

/* 右上角锁定小图标 */
.lock-icon {
    position: absolute;
    top: -9px; left: -9px;
    background-color: #475569;
    color: #ffffff;
    font-size: 10px;
    width: 20px; height: 20px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid #fff;
    z-index: 10;
}

/* 分数上飘动画 */
.floating-num {
    position: absolute;
    font-weight: bold;
    font-size: 24px;
    pointer-events: none;
    animation: floatUp 0.6s ease-out forwards;
    z-index: 150;
}
@keyframes floatUp {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-35px); }
}

/* 设置弹窗 */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}
.modal-overlay.show {
    opacity: 1;
    pointer-events: auto;
}
.modal-content {
    background: #1e293b;
    padding: 24px;
    border-radius: 8px;
    width: 320px;
    color: #fff;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}
.modal-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 16px;
    border-bottom: 1px solid #334155;
    padding-bottom: 8px;
}
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.setting-item input[type="text"] {
    width: 60px;
    background: #334155;
    border: 1px solid #475569;
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    text-align: center;
    text-transform: uppercase;
}
.modal-actions {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}