/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #a1c4fd 0%, #c2e9fb 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #333;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.5s ease;
}

h2 { margin-bottom: 1.5rem; color: #4a90e2; }

input {
    width: 100%;
    padding: 12px;
    margin: 1rem 0;
    border: 2px solid #eee;
    border-radius: 8px;
    outline: none;
}

button {
    background: #4a90e2;
    color: white;
    border: none;
    padding: 10px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
}

.controls {
    margin-top: 20px;
}

#next-btn {
    background: #576574;
    padding: 8px 20px;
    font-size: 0.9rem;
}

#next-btn:hover {
    background: #222f3e;
}

button:hover { background: #357abd; }

.hidden { display: none; }

.error { color: #ff4757; font-size: 0.8rem; margin-top: 10px; }

.music-info { margin: 20px 0; font-weight: bold; color: #2f3542; }

#audio-player { width: 100%; margin-top: 10px; }

.hint { font-size: 0.7rem; color: #888; margin-top: 15px; }