/* 全局样式 */
:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --danger-color: #EF4444;
    --danger-hover: #DC2626;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --border-color: #334155;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* 页面切换 */
.page {
    display: none;
    width: 100%;
    height: 100vh;
}

.page.active {
    display: flex;
}

/* 登录页面 */
#loginPage {
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.login-container {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 40px;
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color), #7C3AED);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 16px rgba(79, 70, 229, 0.3);
}

.logo svg {
    width: 40px;
    height: 40px;
    color: white;
}

.login-container h1 {
    text-align: center;
    font-size: 28px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 14px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-select {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group small {
    font-size: 12px;
    color: var(--text-secondary);
}

.form-group small a {
    color: var(--primary-color);
    text-decoration: none;
}

.form-group small a:hover {
    text-decoration: underline;
}

/* 按钮样式 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #7C3AED);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #475569;
}

/* 聊天室页面 */
#roomPage {
    flex-direction: column;
    background: var(--bg-primary);
}

/* 顶部导航栏 */
.room-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-left h2 {
    font-size: 20px;
    font-weight: 600;
}

.user-count {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.icon-btn svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
}

.icon-btn:hover {
    background: var(--bg-primary);
    transform: scale(1.05);
}

/* 视频容器 */
.video-container {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    padding: 16px;
    overflow-y: auto;
}

.video-wrapper {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.video-wrapper:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.video-player {
    width: 100%;
    height: 100%;
    background: #000;
}

.video-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.user-name {
    font-size: 14px;
    font-weight: 600;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.video-stats {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.8);
}

.stat-item {
    display: flex;
    gap: 4px;
}

.stat-label {
    opacity: 0.7;
}

.local-video {
    border: 2px solid var(--primary-color);
}

.remote-video-list {
    display: contents;
}

/* 控制栏 */
.control-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    padding: 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.control-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
}

.control-btn svg {
    width: 24px;
    height: 24px;
}

.control-btn span {
    font-size: 12px;
    font-weight: 500;
}

.control-btn .icon-off {
    display: none;
}

.control-btn:hover {
    background: var(--bg-primary);
    transform: translateY(-2px);
}

.control-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.control-btn.active:hover {
    background: var(--primary-hover);
}

.control-btn:not(.active) .icon-on {
    display: none;
}

.control-btn:not(.active) .icon-off {
    display: block;
}

.control-btn:not(.active) {
    background: var(--danger-color);
}

.control-btn:not(.active):hover {
    background: var(--danger-hover);
}

/* 设置面板 */
.settings-panel {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.settings-panel.active {
    display: flex;
}

.settings-content {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 32px;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease-out;
}

.settings-content h3 {
    margin-bottom: 24px;
    font-size: 24px;
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
}

/* 通知提示 */
.notification {
    position: fixed;
    top: 80px;
    right: 24px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 2000;
    max-width: 320px;
    border-left: 4px solid var(--primary-color);
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left-color: var(--success-color);
}

.notification.error {
    border-left-color: var(--danger-color);
}

.notification.warning {
    border-left-color: var(--warning-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-container {
        padding: 24px;
    }

    .room-header {
        padding: 12px 16px;
    }

    .header-left h2 {
        font-size: 16px;
    }

    .video-container {
        grid-template-columns: 1fr;
        padding: 12px;
        gap: 12px;
    }

    .control-bar {
        gap: 8px;
        padding: 12px;
        flex-wrap: wrap;
    }

    .control-btn {
        min-width: 60px;
        padding: 10px 12px;
    }

    .control-btn span {
        font-size: 10px;
    }

    .control-btn svg {
        width: 20px;
        height: 20px;
    }

    .settings-content {
        padding: 24px;
    }

    .notification {
        right: 12px;
        left: 12px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 20px;
    }

    .logo {
        width: 60px;
        height: 60px;
    }

    .logo svg {
        width: 30px;
        height: 30px;
    }

    .login-container h1 {
        font-size: 24px;
    }

    .header-right .btn {
        padding: 8px 16px;
        font-size: 12px;
    }
}

/* 加载动画 */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #475569;
}