:root {
    --primary-color: #2c3e50;
    --secondary-color: #ffffff;
    --accent-color: #e74c3c;
    --background-color: #ffffff;
    --card-bg-color: #e74c3c;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    margin: 0;
}

header {
    width: 100%;
    max-width: 800px;
    margin-bottom: 50px;
    text-align: center;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.folder-input {
    width: 100%;
    margin-bottom: 20px;
}

.pc-image {
    width: 350px;
    height: auto;
    margin-bottom: 30px;
}

label {
    font-size: 1.2em;
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #bdc3c7;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.5);
}

main {
    width: 100%;
    max-width: 800px;
}

.category {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--card-bg-color);
    padding: 20px 30px;
    margin-bottom: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.category:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

h3 {
    margin: 0;
    font-size: 1.2em;
    flex-grow: 1;
    color: white;
}

.record-btn {
    width: 50px;
    height: 50px;
    background-color: var(--secondary-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.2s;
}

.record-btn i {
    font-size: 20px;
    color: var(--card-bg-color);
    transition: color 0.3s;
}

.record-btn:hover {
    background-color: #2980b9;
}

.record-btn.recording {
    background-color: var(--accent-color);
}

.record-btn.recording i {
    color: var(--card-bg-color);
    font-size: 24px;
}

.audio-player {
    display: none;
    margin-left: 20px;
}

#loading-container {
    text-align: center;
    margin-top: 20px;
}

#loading-message {
    font-size: 1.1em;
    color: var(--primary-color);
}

.progress-bar-container {
    width: 80%;
    max-width: 400px;
    margin: 10px auto;
    height: 20px;
    background-color: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0;
    background-color: #3498db;
    transition: width 0.4s ease-in-out;
}