/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #000;
    color: #fff;
    overflow: hidden;
}

#app {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

#image-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#image-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* 加载指示器样式 */
#loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #333;
    border-top: 4px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

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

/* 错误提示样式 */
#error-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    background: rgba(255, 0, 0, 0.1);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #ff4444;
}

#retry-btn {
    margin-top: 10px;
    padding: 8px 16px;
    background: #fff;
    color: #000;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#retry-btn:hover {
    background: #f0f0f0;
}

/* 用户反馈样式 */
.user-feedback {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 隐藏类 */
.hidden {
    display: none !important;
}

/* 设备特定样式 */
.mobile-image {
    max-width: calc(100vw - 20px) !important;
    max-height: calc(100vh - 40px) !important;
    touch-action: manipulation;
}

.tablet-image {
    max-width: calc(100vw - 40px) !important;
    max-height: calc(100vh - 60px) !important;
}

.desktop-image {
    max-width: calc(100vw - 60px) !important;
    max-height: calc(100vh - 80px) !important;
}

/* 方向特定样式 */
.portrait-image {
    object-fit: contain;
    object-position: center;
}

.landscape-image {
    object-fit: contain;
    object-position: center;
}

/* 响应式设计 - 移动端 */
@media (max-width: 768px) {
    #image-container img {
        width: 100%;
        height: auto;
        max-width: calc(100vw - 20px);
        max-height: calc(100vh - 40px);
    }
    
    .user-feedback {
        top: 10px;
        font-size: 12px;
        padding: 6px 12px;
    }

    #loading-indicator {
        font-size: 14px;
    }

    #error-message {
        padding: 15px;
        margin: 0 10px;
        font-size: 14px;
    }

    #retry-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* 响应式设计 - 平板端 */
@media (min-width: 769px) and (max-width: 1024px) {
    #image-container img {
        max-width: calc(100vw - 40px);
        max-height: calc(100vh - 60px);
    }

    .user-feedback {
        top: 15px;
        font-size: 14px;
        padding: 8px 16px;
    }

    #loading-indicator {
        font-size: 16px;
    }

    #error-message {
        padding: 20px;
        font-size: 16px;
    }
}

/* 响应式设计 - 桌面端 */
@media (min-width: 1025px) {
    #image-container img {
        max-width: calc(100vw - 60px);
        max-height: calc(100vh - 80px);
    }

    .user-feedback {
        top: 20px;
        font-size: 14px;
    }

    #loading-indicator {
        font-size: 18px;
    }

    #error-message {
        padding: 25px;
        font-size: 16px;
    }
}

/* 横屏特定样式 */
@media (orientation: landscape) {
    .landscape-image {
        max-height: calc(100vh - 20px);
    }

    .user-feedback {
        top: 10px;
    }
}

/* 竖屏特定样式 */
@media (orientation: portrait) {
    .portrait-image {
        max-width: calc(100vw - 20px);
    }
}

/* 帮助按钮样式 */
.help-button {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    z-index: 1000;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    /* 确保按钮可以接收触摸事件 */
    pointer-events: auto;
    /* 移动端触摸优化 */
    touch-action: manipulation;
}

/* 网络诊断按钮样式 */
.diagnostic-button {
    position: fixed;
    top: 20px;
    right: 80px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(74, 144, 226, 0.2);
    border: 2px solid rgba(74, 144, 226, 0.4);
    color: #fff;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    z-index: 1000;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    pointer-events: auto;
    touch-action: manipulation;
}

.diagnostic-button:hover {
    background: rgba(74, 144, 226, 0.3);
    border-color: rgba(74, 144, 226, 0.6);
    transform: scale(1.05);
}

.diagnostic-button:active {
    transform: scale(0.95);
}

.diagnostic-button:focus {
    outline: 2px solid #4A90E2;
    outline-offset: 2px;
}

/* API切换按钮样式 */
.api-switch-button {
    position: fixed;
    top: 20px;
    right: 140px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(34, 197, 94, 0.2);
    border: 2px solid rgba(34, 197, 94, 0.4);
    color: #fff;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    z-index: 1000;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    pointer-events: auto;
    touch-action: manipulation;
}

.api-switch-button:hover {
    background: rgba(34, 197, 94, 0.3);
    border-color: rgba(34, 197, 94, 0.6);
}

.api-switch-button:active {
    transform: scale(0.95);
}

.api-switch-button:focus {
    outline: 2px solid #22C55E;
    outline-offset: 2px;
}

.api-switch-button .api-icon {
    font-size: 16px;
    margin-bottom: 2px;
}

.api-switch-button .api-text {
    font-size: 8px;
    font-weight: 500;
    line-height: 1;
}

.diagnostic-icon {
    font-size: 20px;
    line-height: 1;
    margin-bottom: 2px;
}

.diagnostic-text {
    font-size: 10px;
    font-weight: normal;
    opacity: 0.8;
    line-height: 1;
}

.help-button:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

.help-button:active {
    transform: scale(0.95);
}

.help-button:focus {
    outline: 2px solid #4A90E2;
    outline-offset: 2px;
}

.help-icon {
    font-size: 20px;
    line-height: 1;
    margin-bottom: 2px;
}

.help-text {
    font-size: 10px;
    font-weight: normal;
    opacity: 0.8;
    line-height: 1;
}

/* 移动端按钮样式 */
@media (max-width: 768px) {
    .help-button {
        top: 15px;
        right: 15px;
        width: 50px;
        height: 50px;
        /* 增加触摸区域 */
        min-width: 44px;
        min-height: 44px;
        /* 确保按钮在移动端更容易点击 */
        padding: 8px;
        /* 移动端特定的背景色，提高可见性 */
        background: rgba(255, 255, 255, 0.15);
        border: 2px solid rgba(255, 255, 255, 0.3);
    }
    
    .diagnostic-button {
        top: 15px;
        right: 75px;
        width: 50px;
        height: 50px;
        min-width: 44px;
        min-height: 44px;
        padding: 8px;
        background: rgba(74, 144, 226, 0.25);
        border: 2px solid rgba(74, 144, 226, 0.5);
    }
    
    .api-switch-button {
        top: 15px;
        right: 135px;
        width: 50px;
        height: 50px;
        min-width: 44px;
        min-height: 44px;
        padding: 8px;
        background: rgba(34, 197, 94, 0.25);
        border: 2px solid rgba(34, 197, 94, 0.5);
    }
    
    .help-icon, .diagnostic-icon {
        font-size: 18px;
    }
    
    .help-text, .diagnostic-text {
        font-size: 9px;
    }
}

/* 平板端帮助按钮样式 */
@media (min-width: 769px) and (max-width: 1024px) {
    .help-button {
        top: 18px;
        right: 18px;
        width: 48px;
        height: 48px;
    }
    
    .help-icon {
        font-size: 19px;
    }
    
    .help-text {
        font-size: 9px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .help-button {
        width: 55px;
        height: 55px;
        /* 确保触摸区域足够大 */
        min-width: 44px;
        min-height: 44px;
        /* 移除可能干扰触摸的样式 */
        backdrop-filter: none;
        /* 确保按钮在触摸设备上可见 */
        background: rgba(255, 255, 255, 0.2);
        border: 2px solid rgba(255, 255, 255, 0.4);
    }
    
    .help-button:hover {
        transform: none;
    }
    
    .help-button:active {
        background: rgba(255, 255, 255, 0.4) !important;
        transform: scale(0.95) !important;
        transition: all 0.1s ease !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .help-button {
        background: rgba(255, 255, 255, 0.9);
        color: #000;
        border-color: #fff;
    }
    
    .help-button:hover {
        background: #fff;
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    .help-button {
        transition: none;
    }
    
    .help-button:hover {
        transform: none;
    }
    
    .help-button:active {
        transform: none;
    }
}

/* 屏幕阅读器专用样式 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 用户引导覆盖层样式 */
.guide-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    /* 防止滚动穿透 */
    overscroll-behavior: contain;
    /* 确保覆盖层在所有内容之上 */
    isolation: isolate;
}

.guide-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
}

.guide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(20, 20, 20, 0.95);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.guide-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.guide-title {
    font-size: 20px;
    font-weight: 600;
    color: #fff;
    margin: 0;
}

.guide-close {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    font-size: 24px;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s ease;
    line-height: 1;
}

.guide-close:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.guide-body {
    padding: 20px 24px;
}

.guide-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    margin: 0 0 20px 0;
    text-align: center;
}

.guide-instructions {
    margin-bottom: 20px;
}

.guide-instruction {
    display: flex;
    align-items: flex-start;
    margin-bottom: 16px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.instruction-icon {
    font-size: 24px;
    margin-right: 12px;
    flex-shrink: 0;
    line-height: 1;
}

.instruction-content {
    flex: 1;
}

.instruction-action {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin: 0 0 4px 0;
}

.instruction-description {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    line-height: 1.4;
}

.guide-tips {
    background: rgba(74, 144, 226, 0.1);
    border: 1px solid rgba(74, 144, 226, 0.3);
    border-radius: 8px;
    padding: 16px;
    margin-top: 16px;
}

.tips-title {
    font-size: 14px;
    font-weight: 600;
    color: #4A90E2;
    margin: 0 0 8px 0;
}

.tips-list {
    margin: 0;
    padding-left: 16px;
    color: rgba(92, 89, 89, 0.8);
}

.tips-list li {
    font-size: 13px;
    line-height: 1.4;
    margin-bottom: 4px;
}

.guide-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.guide-checkbox {
    display: flex;
    align-items: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    user-select: none;
}

.guide-checkbox input {
    margin-right: 8px;
    accent-color: #4A90E2;
}

.guide-got-it {
    background: #4A90E2;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.guide-got-it:hover {
    background: #357ABD;
    transform: translateY(-1px);
}

.guide-got-it:active {
    transform: translateY(0);
}

/* 移动端引导样式优化 */
@media (max-width: 768px) {
    .guide-content {
        width: 95%;
        max-height: 85vh;
    }
    
    .guide-header {
        padding: 16px 20px 12px;
    }
    
    .guide-title {
        font-size: 18px;
    }
    
    .guide-body {
        padding: 16px 20px;
    }
    
    .guide-instruction {
        padding: 10px;
        margin-bottom: 12px;
    }
    
    .instruction-icon {
        font-size: 20px;
        margin-right: 10px;
    }
    
    .instruction-action {
        font-size: 15px;
    }
    
    .instruction-description {
        font-size: 13px;
    }
    
    .guide-footer {
        padding: 12px 20px 16px;
        flex-direction: column;
        gap: 12px;
    }
    
    .guide-got-it {
        width: 100%;
        padding: 12px;
    }
}

/* 平板端引导样式优化 */
@media (min-width: 769px) and (max-width: 1024px) {
    .guide-content {
        max-width: 600px;
    }
    
    .instruction-icon {
        font-size: 26px;
    }
    
    .instruction-action {
        font-size: 17px;
    }
    
    .instruction-description {
        font-size: 15px;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .guide-content {
        background: rgba(0, 0, 0, 0.95);
        border-color: #fff;
    }
    
    .guide-instruction {
        background: rgba(255, 255, 255, 0.1);
        border-color: rgba(255, 255, 255, 0.3);
    }
    
    .guide-tips {
        background: rgba(74, 144, 226, 0.2);
        border-color: #4A90E2;
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    .guide-overlay {
        transition: none;
    }
    
    .guide-close,
    .guide-got-it {
        transition: none;
    }
    
    .guide-got-it:hover {
        transform: none;
    }
}

/* 动画增强样式 */
@keyframes slideInFromBottom {
    0% {
        transform: translate(-50%, -50%) translateY(20px);
        opacity: 0;
    }
    100% {
        transform: translate(-50%, -50%) translateY(0);
        opacity: 1;
    }
}

@keyframes slideInFromTop {
    0% {
        transform: translate(-50%, -50%) translateY(-20px);
        opacity: 0;
    }
    100% {
        transform: translate(-50%, -50%) translateY(0);
        opacity: 1;
    }
}

@keyframes fadeInScale {
    0% {
        transform: translate(-50%, -50%) scale(0.9);
        opacity: 0;
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 引导内容动画 */
.guide-content {
    animation: fadeInScale 0.3s ease-out;
}

.guide-instruction {
    transition: all 0.2s ease;
}

.guide-instruction:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(4px);
}

/* 焦点管理和键盘导航 */
.guide-overlay *:focus {
    outline: 2px solid #4A90E2;
    outline-offset: 2px;
    border-radius: 4px;
}

.guide-close:focus,
.guide-got-it:focus {
    outline-color: #fff;
}

/* 超大屏幕优化 */
@media (min-width: 1440px) {
    .guide-content {
        max-width: 600px;
    }
    
    .guide-title {
        font-size: 22px;
    }
    
    .instruction-action {
        font-size: 18px;
    }
    
    .instruction-description {
        font-size: 16px;
    }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
    .guide-content {
        width: 98%;
        max-height: 90vh;
        border-radius: 8px;
    }
    
    .guide-header {
        padding: 12px 16px 8px;
    }
    
    .guide-title {
        font-size: 16px;
    }
    
    .guide-body {
        padding: 12px 16px;
    }
    
    .guide-instruction {
        padding: 8px;
        margin-bottom: 8px;
    }
    
    .instruction-icon {
        font-size: 18px;
        margin-right: 8px;
    }
    
    .instruction-action {
        font-size: 14px;
    }
    
    .instruction-description {
        font-size: 12px;
    }
    
    .guide-footer {
        padding: 8px 16px 12px;
    }
    
    .guide-got-it {
        padding: 10px;
        font-size: 13px;
    }
}

/* 横屏手机优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .guide-content {
        max-height: 95vh;
        width: 85%;
    }
    
    .guide-header {
        padding: 10px 20px 8px;
    }
    
    .guide-body {
        padding: 10px 20px;
    }
    
    .guide-footer {
        padding: 8px 20px 10px;
    }
}

/* 暗色主题增强 */
@media (prefers-color-scheme: dark) {
    .guide-content {
        background: rgba(15, 15, 15, 0.98);
        border-color: rgba(255, 255, 255, 0.15);
    }
    
    .guide-instruction {
        background: rgba(255, 255, 255, 0.03);
        border-color: rgba(255, 255, 255, 0.08);
    }
    
    .guide-instruction:hover {
        background: rgba(255, 255, 255, 0.06);
    }
}

/* 亮色主题支持 */
@media (prefers-color-scheme: light) {
    .guide-content {
        background: rgba(255, 255, 255, 0.95);
        color: #333;
        border-color: rgba(0, 0, 0, 0.1);
    }
    
    .guide-title,
    .instruction-action {
        color: #333;
    }
    
    .guide-subtitle,
    .instruction-description {
        color: rgba(0, 0, 0, 0.7);
    }
    
    .guide-instruction {
        background: rgba(0, 0, 0, 0.03);
        border-color: rgba(0, 0, 0, 0.08);
    }
    
    .guide-instruction:hover {
        background: rgba(0, 0, 0, 0.06);
    }
    
    .guide-close {
        color: rgba(0, 0, 0, 0.7);
    }
    
    .guide-close:hover {
        color: #333;
        background: rgba(0, 0, 0, 0.1);
    }
    
    .guide-checkbox {
        color: rgba(0, 0, 0, 0.8);
    }
}

/* 打印样式 */
@media print {
    .guide-overlay {
        display: none !important;
    }
    
    .help-button {
        display: none !important;
    }
}

/* 无障碍增强 */
@media (prefers-reduced-transparency) {
    .guide-backdrop {
        backdrop-filter: none;
        background: rgba(0, 0, 0, 0.9);
    }
    
    .guide-content {
        backdrop-filter: none;
        background: rgba(20, 20, 20, 1);
    }
    
    .help-button {
        backdrop-filter: none;
        background: rgba(255, 255, 255, 0.2);
    }
}

/* 强制颜色模式支持 */
@media (forced-colors: active) {
    .guide-content {
        background: Canvas;
        color: CanvasText;
        border: 1px solid ButtonBorder;
    }
    
    .guide-instruction {
        background: Field;
        border: 1px solid ButtonBorder;
    }
    
    .guide-got-it {
        background: ButtonFace;
        color: ButtonText;
        border: 1px solid ButtonBorder;
    }
    
    .guide-close {
        color: ButtonText;
    }
    
    .help-button {
        background: ButtonFace;
        color: ButtonText;
        border: 2px solid ButtonBorder;
    }
}

/* 触摸设备特定优化 */
@media (pointer: coarse) {
    .guide-instruction {
        padding: 16px;
        margin-bottom: 16px;
    }
    
    .guide-close {
        padding: 8px;
        font-size: 28px;
    }
    
    .guide-got-it {
        padding: 14px 24px;
        font-size: 16px;
    }
    
    .guide-checkbox {
        padding: 8px 0;
    }
    
    .guide-checkbox input {
        width: 18px;
        height: 18px;
        margin-right: 12px;
    }
}

/* 精确指针设备优化 */
@media (pointer: fine) {
    .guide-instruction:hover {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }
    
    .guide-close:hover {
        transform: scale(1.1);
    }
    
    .guide-got-it:hover {
        box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
    }
}

/* 容器查询支持（现代浏览器） */
@container (max-width: 400px) {
    .guide-content {
        border-radius: 6px;
    }
    
    .guide-instruction {
        flex-direction: column;
        text-align: center;
    }
    
    .instruction-icon {
        margin-right: 0;
        margin-bottom: 8px;
    }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .spinner {
        border-width: 2px;
    }

    .user-feedback {
        backdrop-filter: blur(20px);
    }
    
    .help-button {
        backdrop-filter: blur(20px);
    }
    
    .guide-backdrop {
        backdrop-filter: blur(20px);
    }
    
    .guide-content {
        backdrop-filter: blur(30px);
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
    }
    
    .guide-instruction {
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }
}

/* 性能优化 */
.guide-overlay,
.guide-content,
.guide-instruction {
    will-change: transform, opacity;
}

/* 动画完成后清理 */
.guide-overlay.animation-complete {
    will-change: auto;
}

.guide-overlay.animation-complete .guide-content,
.guide-overlay.animation-complete .guide-instruction {
    will-change: auto;
}

/* 动态视口单位支持 */
@supports (height: 100dvh) {
    #app {
        height: 100dvh;
    }
    
    .guide-content {
        max-height: 80dvh;
    }
    
    @media (max-width: 768px) {
        .guide-content {
            max-height: 85dvh;
        }
    }
    
    @media (max-width: 480px) {
        .guide-content {
            max-height: 90dvh;
        }
    }
}

/* CSS Grid 支持的布局增强 */
@supports (display: grid) {
    .guide-instructions {
        display: grid;
        gap: 16px;
        grid-template-columns: 1fr;
    }
    
    @media (min-width: 769px) {
        .guide-instructions {
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        }
    }
}

/* Flexbox Gap 支持 */
@supports (gap: 1rem) {
    .guide-footer {
        gap: 16px;
    }
    
    @media (max-width: 768px) {
        .guide-footer {
            gap: 12px;
        }
    }
}

/* 现代滚动条样式 */
.guide-content::-webkit-scrollbar {
    width: 8px;
}

.guide-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

.guide-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.guide-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Firefox 滚动条样式 */
.guide-content {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) rgba(255, 255, 255, 0.05);
}

/* 可变字体支持 */
@supports (font-variation-settings: normal) {
    .guide-title {
        font-variation-settings: "wght" 600;
    }
    
    .instruction-action {
        font-variation-settings: "wght" 600;
    }
}

/* 逻辑属性支持 */
@supports (margin-inline-start: 0) {
    .instruction-icon {
        margin-inline-end: 12px;
        margin-inline-start: 0;
    }
    
    .guide-checkbox input {
        margin-inline-end: 8px;
        margin-inline-start: 0;
    }
    
    .tips-list {
        padding-inline-start: 16px;
    }
}

/* 色彩空间支持 */
@supports (color: color(display-p3 1 0 0)) {
    @media (color-gamut: p3) {
        .guide-got-it {
            background: color(display-p3 0.29 0.56 0.89);
        }
        
        .guide-got-it:hover {
            background: color(display-p3 0.21 0.48 0.74);
        }
        
        .tips-title {
            color: color(display-p3 0.29 0.56 0.89);
        }
    }
}

/* 环境变量支持（安全区域） */
@supports (padding: max(0px, env(safe-area-inset-top))) {
    .guide-content {
        padding-top: max(20px, env(safe-area-inset-top));
        padding-bottom: max(20px, env(safe-area-inset-bottom));
        padding-left: max(24px, env(safe-area-inset-left));
        padding-right: max(24px, env(safe-area-inset-right));
    }
    
    .help-button {
        top: max(20px, env(safe-area-inset-top) + 10px);
        right: max(20px, env(safe-area-inset-right) + 10px);
    }
    
    @media (max-width: 768px) {
        .help-button {
            top: max(15px, env(safe-area-inset-top) + 5px);
            right: max(15px, env(safe-area-inset-right) + 5px);
        }
    }
}

/* 折叠屏设备支持 */
@media (screen-spanning: single-fold-vertical) {
    .guide-content {
        max-width: 45vw;
        margin-right: 5vw;
    }
}

@media (screen-spanning: single-fold-horizontal) {
    .guide-content {
        max-height: 40vh;
        margin-bottom: 5vh;
    }
}

/* 悬停能力检测 */
@media (hover: hover) {
    .guide-instruction {
        cursor: pointer;
    }
    
    .guide-instruction:hover .instruction-icon {
        animation: pulse 1s ease-in-out;
    }
}

/* 焦点可见性增强 */
@supports selector(:focus-visible) {
    .guide-overlay *:focus {
        outline: none;
    }
    
    .guide-overlay *:focus-visible {
        outline: 2px solid #4A90E2;
        outline-offset: 2px;
        border-radius: 4px;
    }
}

/* 用户偏好：减少数据使用 */
@media (prefers-reduced-data: reduce) {
    .guide-backdrop {
        backdrop-filter: none;
    }
    
    .guide-content {
        backdrop-filter: none;
        box-shadow: none;
    }
    
    .help-button {
        backdrop-filter: none;
    }
}

/* 响应式字体大小 */
@supports (font-size: clamp(1rem, 2.5vw, 2rem)) {
    .guide-title {
        font-size: clamp(16px, 4vw, 22px);
    }
    
    .instruction-action {
        font-size: clamp(14px, 3vw, 18px);
    }
    
    .instruction-description {
        font-size: clamp(12px, 2.5vw, 16px);
    }
}

/* 现代CSS重置增强 */
@supports (scrollbar-gutter: stable) {
    .guide-content {
        scrollbar-gutter: stable;
    }
}

/* 容器查询增强 */
@supports (container-type: inline-size) {
    .guide-content {
        container-type: inline-size;
    }
    
    @container (max-width: 400px) {
        .guide-header {
            flex-direction: column;
            gap: 10px;
            text-align: center;
        }
        
        .guide-close {
            position: absolute;
            top: 10px;
            right: 10px;
        }
    }
    
    @container (min-width: 600px) {
        .guide-instructions {
            columns: 2;
            column-gap: 20px;
        }
        
        .guide-instruction {
            break-inside: avoid;
        }
    }
}