:root {
    --main-color: #4a90e2;
    --bg-color: #f0f8ff;
    --text-color: #333;
    --stop-color: #e74c3c;
    --flash-bg: #fff3cd;
    --flash-text: #856404;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* Flash messages */
.flash-messages {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    width: 80%;
    max-width: 600px;
}

.flash-message {
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 4px;
    background-color: var(--flash-bg);
    color: var(--flash-text);
    text-align: center;
    animation: fadeOut 5s forwards;
    opacity: 1;
    transition: opacity 0.5s;
}

@keyframes fadeOut {
    0% { opacity: 1; }
    90% { opacity: 1; }
    100% { opacity: 0; }
}

.container {
    max-width: 90%;
    margin: 0 auto;
    padding: 20px;
}

.content {
    display: flex;
    gap: 20px;
}

.input-section, .preview-section {
    flex: 1;
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h2 {
    color: var(--main-color);
    margin-top: 0;
}

input[type="text"], input[type="checkbox"], button, select {
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

input[type="text"] {
    width: 100%;
}

.audio-option {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.audio-option input[type="checkbox"] {
    margin-right: 10px;
}

button {
    background-color: var(--main-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 150px;
}

button:hover {
    background-color: #357ae8;
}

#progress_bar {
    width: 100%;
    background-color: #ddd;
    height: 20px;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 10px;
}

#progress_bar_inner {
    width: 0%;
    height: 100%;
    background-color: var(--main-color);
    transition: width 0.5s;
}

video, audio {
    width: 100%;
    margin-top: 10px;
}

#lang_select {
    width: 200px;
    margin-top: 20px;
}

.nav-bar {
    background-color: var(--main-color);
    padding: 10px 0;
}

.nav-container {
    max-width: 90%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-bar a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.btn-download, .btn-stop {
    width: 200px;
    padding: 10px;
    margin-bottom: 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    background-color: var(--main-color);
    color: white;
}

.play-audio.playing {
    background-color: var(--stop-color);
}

.play-audio:hover {
    background-color: #357ae8;
}

.play-audio.playing:hover {
    background-color: #c0392b;
}

.btn-stop {
    background-color: var(--stop-color);
    color: white;
    display: none;
}

.btn-download:hover {
    background-color: #357ae8;
}

.btn-stop:hover {
    background-color: #c0392b;
}

/* 认证相关样式 */
.auth-container {
    max-width: 400px;
    margin: 50px auto;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.auth-container h1 {
    text-align: center;
    color: var(--main-color);
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.auth-container button {
    width: 100%;
    padding: 10px;
    margin-top: 10px;
}

.auth-container p {
    text-align: center;
    margin-top: 15px;
}

.auth-container a {
    color: var(--main-color);
    text-decoration: none;
}

.auth-container a:hover {
    text-decoration: underline;
}

/* 导航栏用户信息 */
.user-info {
    color: white;
    margin-left: 20px;
}

.user-info a {
    color: white;
    text-decoration: none;
    margin-left: 10px;
}

.user-info a:hover {
    text-decoration: underline;
}

.error-message {
    color: #dc3545;
    background-color: #f8d7da;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #f5c6cb;
    margin-bottom: 15px;
}