:root {
    --primary-color: #4a90e2;
    --student-color: #2ecc71;
    --teacher-color: #3498db;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    margin-bottom: 5px;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 20px;
}

.card-header {
    border-bottom: 2px solid #eee;
    margin-bottom: 15px;
    padding-bottom: 10px;
}

h2 {
    margin-top: 0;
    font-size: 1.2rem;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="password"], textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-sizing: border-box;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background 0.3s;
}

.primary-btn:hover {
    background-color: #357abd;
}

.status-msg {
    margin-top: 10px;
    font-size: 0.9rem;
    color: #666;
}

.grid-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }
}

.student-card {
    border-top: 5px solid var(--student-color);
}

.teacher-card {
    border-top: 5px solid var(--teacher-color);
}

.mic-controls {
    text-align: center;
    margin-bottom: 20px;
}

.mic-btn {
    background-color: #f8f9fa;
    border: 2px solid #ddd;
    border-radius: 50px;
    padding: 15px 30px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s;
}

.mic-btn:not(:disabled):hover {
    background-color: #e9ecef;
    border-color: var(--student-color);
}

.mic-btn.recording {
    background-color: #ffeded;
    border-color: #e74c3c;
    color: #e74c3c;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.feedback-box {
    background: #f0fff4;
    border: 1px dashed var(--student-color);
    padding: 15px;
    border-radius: 8px;
    min-height: 80px;
}

.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.metric {
    background: #f8f9fa;
    padding: 10px;
    border-radius: 8px;
    text-align: center;
}

.metric .label {
    display: block;
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 5px;
}

.metric .value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--teacher-color);
}

.metric-block {
    margin-bottom: 15px;
}

.error-list {
    margin: 5px 0;
    padding-left: 20px;
    color: #c0392b;
}

.notes {
    font-style: italic;
    color: #555;
    background: #fdf6e3;
    padding: 10px;
    border-radius: 6px;
}

.transcription-box {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 15px;
    border-radius: 8px;
    min-height: 50px;
    font-family: monospace;
}

.placeholder-text {
    color: #999;
    font-style: italic;
}