/* 自定义 CSS 变量 */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --light-bg: #f8f9fa;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --transition-speed: 0.3s;
}

body {
    background-color: #f0f2f5;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* 导航栏优化 */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    padding: 1rem 0;
}
.navbar-brand {
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* 卡片容器样式 */
.content-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    border: none;
    transition: transform var(--transition-speed);
}
.content-card:hover {
    transform: translateY(-2px);
}

/* 标题样式 */
.section-title {
    font-weight: 700;
    color: #2b2d42;
    margin-bottom: 1.5rem;
    position: relative;
    padding-left: 1rem;
    border-left: 5px solid var(--primary-color);
}

/* 英雄区域 (原 Jumbotron) */
.hero-section {
    background: linear-gradient(120deg, #e0c3fc 0%, #8ec5fc 100%);
    color: #2b2d42;
    border-radius: 16px;
    padding: 3rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}
.hero-section::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
}

/* 表单控件优化 */
.form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 0.5rem;
}
.form-control, .form-select {
    border-radius: 10px;
    padding: 0.75rem 1rem;
    border: 1px solid #dee2e6;
    transition: all var(--transition-speed);
}
.form-control:focus, .form-select:focus {
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.15);
    border-color: var(--primary-color);
}

/* 按钮优化 */
.btn {
    border-radius: 10px;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: all 0.2s ease;
}
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}
.btn-lg {
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
}
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.btn-purple {
    background-color: #7c3aed;
    border-color: #7c3aed;
    color: white;
}
.btn-purple:hover {
    background-color: #6d28d9;
    border-color: #6d28d9;
    color: white;
}

/* 录音波形图 */
#waveformCanvas {
    width: 100%;
    height: 80px;
    background-color: rgba(255,255,255,0.5);
    border-radius: 12px;
    margin-top: 15px;
    -webkit-backdrop-filter: blur(5px);
    backdrop-filter: blur(5px);
}

/* 辅助类替代内联样式 */
.start-hidden { display: none; }
.input-group-rounded { border-radius: 10px; overflow: hidden; }
.input-file-import { max-width: 320px; }
.login-container-margin { margin-top: 10vh; }
.record-content-box { white-space: pre-wrap; min-height: 200px; }
.hero-text { opacity: 0.9; }

/* 录转文显示区域 */
.recorded-text-content {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #e9ecef;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.03);
    font-size: 1.05rem;
    line-height: 1.8;
    color: #495057;
    min-height: 150px;
    max-height: 400px;
    overflow-y: auto;
}

/* contenteditable 占位符效果 */
.recorded-text-content:empty::before {
    content: attr(data-placeholder);
    color: #adb5bd;
    font-style: italic;
    pointer-events: none;
}

/* 子面板样式 (如学生表现) */
.sub-panel {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #e9ecef;
}

.table thead th {
    font-weight: 600;
    color: #6c757d;
    border-top: none;
    padding: 0.8rem;
}

.stat-count {
    display: inline-block;
    min-width: 20px;
    text-align: center;
    font-weight: bold;
}

.action-btn {
    border-radius: 6px;
    padding: 2px 6px !important;
    font-size: 0.75rem !important;
    transition: all 0.2s;
}

.action-btn:hover {
    transform: scale(1.1);
}

.score-input, .comments-input {
    border-radius: 6px;
    border: 1px solid #dee2e6;
    transition: border-color 0.2s;
}

.score-input:focus, .comments-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.1);
}

.student-row-press {
    background-color: rgba(67, 97, 238, 0.05) !important;
}

.fade-in-item {
    animation: fadeIn 0.3s ease-out forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn-outline-secondary { color: #6c757d; border-color: #dee2e6; }
.btn-outline-secondary:hover { background-color: #f8f9fa; color: #495057; border-color: #dee2e6; }

.table-responsive {
    max-height: 500px;
    overflow-y: auto;
}

/* 评分颜色 */
.score-high { color: #198754; font-weight: bold; }
.score-mid { color: #fd7e14; font-weight: bold; }
.score-low { color: #dc3545; font-weight: bold; }

/* 实用工具类 */
.hidden { display: none !important; }
.gap-3 { gap: 1rem !important; }

/* 原有动画保留 */
@keyframes successPop {
    0% { transform: scale(0.8) translate(-50%, -50%); opacity: 0; }
    50% { transform: scale(1.1) translate(-50%, -50%); opacity: 1; }
    100% { transform: scale(1) translate(-50%, -50%); opacity: 1; }
}
.save-success-animation {
    animation: successPop 0.5s ease-out forwards;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transform-origin: top left;
    z-index: 9999;
    background: rgba(255, 255, 255, 0.98);
    padding: 30px 50px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    text-align: center;
    display: none;
    border: 1px solid rgba(0,0,0,0.05);
}
.save-success-animation .icon-circle {
    width: 80px;
    height: 80px;
    background: #20c997;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 40px;
    box-shadow: 0 10px 20px rgba(32, 201, 151, 0.3);
}
.save-success-animation span {
    font-size: 24px;
    font-weight: 700;
    color: #343a40;
    display: block;
}

/* 按钮加载状态 */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}
.btn-loading::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-top: -10px;
    margin-left: -10px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

.pulse-red {
    animation: pulse-red-animation 2s infinite;
}
@keyframes pulse-red-animation {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.7; }
    100% { transform: scale(1); opacity: 1; }
}

.btn-save-animate {
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}
.btn-save-animate:active {
    transform: scale(0.95);
}

.login-error {
    color: #dc3545;
    margin-top: 10px;
    text-align: center;
    font-weight: 500;
}