:root {
    --primary-color: #4a90e2;
    --secondary-color: #6c757d;
    --danger-color: #dc3545;
    --text-color: #333;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --control-bg: rgba(0, 0, 0, 0.5);
    --transition-speed: 0.3s;
    --border-radius: 1rem;
}

.dark-theme {
    --primary-color: #5b9fe8;
    --secondary-color: #9ca3af;
    --danger-color: #ef4444;
    --text-color: #e5e7eb;
    --background-color: #1f2937;
    --card-background: #111827;
    --border-color: #374151;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --overlay-bg: rgba(0, 0, 0, 0.7);
    --control-bg: rgba(0, 0, 0, 0.6);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

h1, h2, h3 {
    color: var(--text-color);
}

.theme-toggle {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    transition: color var(--transition-speed);
}

.theme-toggle:hover {
    color: var(--primary-color);
}

/* 视频容器样式 - 沉浸式设计 */
.video-wrapper {
    margin-bottom: 20px;
}

.video-container {
    position: relative;
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: #000;
    box-shadow: 0 4px 20px var(--shadow-color);
    aspect-ratio: 16/9;
}

/* 根据视频方向调整容器 */
.video-container.portrait {
    aspect-ratio: 9/16;
    max-width: 480px;
    margin: 0 auto;
}

video {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
    background-color: #000;
    border-radius: var(--border-radius);
}

/* 悬浮控制按钮组 */
.floating-controls {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-container:hover .floating-controls {
    opacity: 1;
}

.float-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--control-bg);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    backdrop-filter: blur(4px);
    transition: transform 0.3s ease, background-color 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.float-btn:hover {
    transform: scale(1.1);
    background-color: var(--primary-color);
}

.float-btn:active {
    transform: scale(0.95);
}

.float-btn i {
    pointer-events: none;
}

/* 加载遮罩层 */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--overlay-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    backdrop-filter: blur(4px);
}

.overlay p {
    margin-bottom: 10px;
    color: white;
    font-weight: 500;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.overlay .small-tip {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-top: 5px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 设置面板和声音设置 */
.sound-settings {
    background-color: var(--card-background);
    border-radius: 1rem;
    padding: 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px var(--shadow-color);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.5s ease, padding 0.3s ease, opacity 0.3s ease;
}

.sound-settings.show {
    padding: 20px;
    max-height: 200px;
    opacity: 1;
}

.setting-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    gap: 15px;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    outline: none;
    transition: background 0.3s;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: background 0.3s;
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: background 0.3s;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

/* 历史记录区域 */
.history-container {
    background-color: var(--card-background);
    border-radius: 1rem;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px var(--shadow-color);
}

.history-list {
    margin-top: 15px;
    max-height: 300px;
    overflow-y: auto;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.history-item:last-child {
    border-bottom: none;
}

.history-item:hover {
    background-color: var(--background-color);
}

.history-item .url {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 10px;
}

.history-item .date {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* 设置面板 */
.settings-panel {
    background-color: var(--card-background);
    border-radius: 1rem;
    padding: 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px var(--shadow-color);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.5s ease, padding 0.3s ease, opacity 0.3s ease;
}

.settings-panel.show {
    padding: 20px;
    max-height: 300px;
    opacity: 1;
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 500;
    transition: background-color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow-color);
}

button i {
    margin-right: 5px;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.secondary-btn {
    background-color: var(--secondary-color);
    color: white;
}

.danger-btn {
    background-color: var(--danger-color);
    color: white;
}

.icon-btn {
    background: none;
    font-size: 1.3rem;
    color: var(--text-color);
    padding: 5px 10px;
}

.icon-btn:hover {
    color: var(--primary-color);
    box-shadow: none;
}

/* 页脚 */
footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 100;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(5px);
}

.modal[style*="flex"] {
    opacity: 1;
}

.modal-content {
    background-color: var(--card-background);
    padding: 30px;
    border-radius: 1rem;
    width: 80%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal[style*="flex"] .modal-content {
    transform: translateY(0);
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    transition: color 0.2s;
}

.close-btn:hover {
    color: var(--danger-color);
}

pre {
    background-color: var(--background-color);
    padding: 15px;
    border-radius: 0.75rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-color);
    font-family: monospace;
    border: 1px solid var(--border-color);
}

/* 媒体查询 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .video-container {
        border-radius: 0.75rem;
    }

    .floating-controls {
        opacity: 1;
        right: 15px;
    }
    
    .float-btn {
        width: 42px;
        height: 42px;
        font-size: 1rem;
    }
    
    .setting-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    input[type="range"] {
        width: 100%;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    .modal-content {
        width: 90%;
        padding: 20px;
    }
}