/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --border-radius: 2px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--white);
    color: var(--black);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
}

/* ==================== 主容器 ==================== */
.container {
    width: 100%;
    max-width: 800px;
    border: 2px solid var(--black);
    padding: var(--spacing-xl);
    background-color: var(--white);
}

/* ==================== 头部区域 ==================== */
.header {
    text-align: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--black);
    margin-bottom: var(--spacing-xl);
}

.logo {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.title {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: var(--spacing-xs);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.subtitle {
    font-size: 14px;
    color: var(--gray-500);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    letter-spacing: 0.5px;
}

/* ==================== 上传区域 ==================== */
.upload-section {
    margin-bottom: var(--spacing-lg);
}

.upload-area {
    border: 2px dashed var(--black);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    background-color: var(--white);
}

.upload-area:hover {
    background-color: var(--gray-100);
    border-color: var(--gray-500);
}

.upload-area.dragover {
    background-color: var(--gray-200);
    border-color: var(--black);
    border-style: solid;
}

/* SVG 旋转动画 */
#uploadIcon {
    transform-origin: center;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.upload-area:hover #uploadIcon {
    transform: rotate(360deg);
}

.upload-text {
    font-size: 18px;
    font-weight: 600;
    margin: var(--spacing-md) 0 var(--spacing-xs) 0;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.upload-hint {
    font-size: 13px;
    color: var(--gray-500);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    /* 允许键盘访问，保持可聚焦性 */
}

/* 当文件输入获得焦点时，给父元素添加焦点样式 */
.file-input:focus + .upload-area,
.upload-area:has(.file-input:focus) {
    outline: 3px solid var(--black);
    outline-offset: 2px;
}

/* ==================== 文件信息 ==================== */
.file-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border: 1px solid var(--black);
    background-color: var(--gray-100);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
}

.info-label {
    font-weight: 600;
    color: var(--black);
}

.info-value {
    color: var(--gray-500);
    text-align: right;
    word-break: break-all;
    max-width: 60%;
}

/* ==================== 选项区域 ==================== */
.options-section {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    letter-spacing: -0.3px;
}

.advanced-settings {
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.advanced-settings details {
    border: 1px solid var(--black);
    background-color: var(--gray-100);
    padding: var(--spacing-sm);
    transition: var(--transition);
}

.advanced-settings details:hover {
    background-color: var(--gray-200);
}

.advanced-settings details[open] {
    background-color: var(--gray-100);
}

.advanced-settings summary {
    cursor: pointer;
    font-weight: 600;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    user-select: none;
    list-style: none;
    position: relative;
    padding-left: 20px;
}

.advanced-settings summary::-webkit-details-marker {
    display: none;
}

.advanced-settings summary::before {
    content: '▸';
    position: absolute;
    left: 0;
    transition: transform 0.2s ease;
}

.advanced-settings details[open] summary::before {
    transform: rotate(90deg);
}

.advanced-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.advanced-option {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    padding: var(--spacing-sm);
    border: 1px dashed var(--gray-300);
    background-color: var(--white);
    transition: var(--transition);
    cursor: pointer;
}

.advanced-option:hover {
    border-color: var(--black);
    border-style: solid;
}

.advanced-option input[type="checkbox"] {
    margin-top: 2px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    accent-color: var(--black);
}

.option-title {
    font-weight: 600;
    font-size: 14px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    transition: var(--transition);
}

.option-desc {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
    line-height: 1.4;
}

.corruption-levels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.level-option {
    cursor: pointer;
    user-select: none;
}

.level-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.level-card {
    border: 2px solid var(--gray-300);
    padding: var(--spacing-md);
    transition: var(--transition);
    background-color: var(--white);
    height: 100%;
}

.level-card:hover {
    border-color: var(--black);
    background-color: var(--gray-100);
}

.level-option input[type="radio"]:checked + .level-card {
    border-color: var(--black);
    background-color: var(--black);
    color: var(--white);
}

.level-name {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.level-desc {
    font-size: 13px;
    opacity: 0.8;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

/* ==================== 按钮 ==================== */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 15px;
    font-weight: 600;
    border: 2px solid var(--black);
    cursor: pointer;
    transition: var(--transition);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    letter-spacing: 0.3px;
}

.btn:active {
    transform: translateY(1px);
}

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

.btn-primary:hover {
    background-color: var(--gray-500);
    border-color: var(--gray-500);
}

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

.btn-secondary:hover {
    background-color: var(--gray-100);
}

/* ==================== 状态区域 ==================== */
.status-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.status-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.status-text {
    font-size: 16px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    color: var(--gray-500);
}

/* ==================== 成功区域 ==================== */
.success-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.success-section svg {
    margin-bottom: var(--spacing-md);
}

.success-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.success-desc {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: var(--spacing-lg);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.report-card {
    width: 100%;
    text-align: left;
    border: 2px solid var(--black);
    padding: var(--spacing-md);
    background-color: var(--white);
    margin-bottom: var(--spacing-md);
}

.report-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.report-meta {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.report-meta li {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.report-label {
    font-weight: 600;
}

.report-value {
    color: var(--gray-500);
    text-align: right;
    max-width: 60%;
}

.report-steps-title {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: var(--spacing-xs);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.report-steps {
    padding-left: var(--spacing-md);
    display: grid;
    gap: 4px;
    font-size: 13px;
    color: var(--gray-500);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

/* ==================== 底部区域 ==================== */
.footer {
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--black);
    margin-top: var(--spacing-xl);
}

.warning {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border: 1px solid var(--black);
    background-color: var(--gray-100);
    font-size: 12px;
    line-height: 1.5;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
}

.warning svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 12px;
}

.footer-link {
    color: var(--black);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.footer-link:hover {
    border-bottom-color: var(--black);
}

.footer-divider {
    color: var(--gray-400);
}

.copyright {
    text-align: center;
    margin-top: var(--spacing-md);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 11px;
    color: var(--gray-500);
    letter-spacing: 0.5px;
}

/* ==================== Toast 通知样式 ==================== */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    max-width: 90vw;
    pointer-events: none;
}

.toast {
    background: var(--white);
    border: 2px solid var(--black);
    padding: 16px 20px;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-width: 300px;
    max-width: 500px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    pointer-events: all;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast-show {
    opacity: 1;
    transform: translateY(0);
}

.toast-message {
    flex: 1;
    font-size: 14px;
    line-height: 1.5;
    color: var(--black);
}

.toast-action {
    background: none;
    border: 1px solid var(--black);
    padding: 4px 12px;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.toast-action:hover {
    background: var(--black);
    color: var(--white);
}

/* Toast 类型样式 */
.toast-error {
    background: #fee;
    border-color: #c00;
}

.toast-error .toast-message {
    color: #c00;
}

.toast-error .toast-action {
    border-color: #c00;
    color: #c00;
}

.toast-error .toast-action:hover {
    background: #c00;
    color: var(--white);
}

.toast-success {
    background: #efe;
    border-color: #080;
}

.toast-success .toast-message {
    color: #080;
}

/* 移动端适配 */
@media (max-width: 640px) {
    .toast-container {
        bottom: 10px;
        left: 10px;
        right: 10px;
        transform: none;
    }
    
    .toast {
        min-width: auto;
        max-width: 100%;
    }
}

/* ==================== 可访问性样式 ==================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* 焦点样式增强 */
.btn:focus,
.mode-tab:focus,
input[type="radio"]:focus + .level-card,
input[type="checkbox"]:focus {
    outline: 3px solid var(--black);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .upload-area {
        border-width: 3px;
    }
    
    .btn {
        border-width: 3px;
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    .title {
        font-size: 24px;
    }

    .corruption-levels {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .info-row {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .info-value {
        max-width: 100%;
        text-align: left;
    }
}

/* ==================== 进度条样式 ==================== */
.progress-container {
    margin-top: 20px;
    width: 100%;
    max-width: 400px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-300);
    border: 1px solid var(--black);
    position: relative;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--black);
    transition: width 0.3s ease;
    position: relative;
}

/* 进度条动画条纹 */
.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.2) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0.2) 75%,
        transparent 75%,
        transparent
    );
    background-size: 20px 20px;
    animation: progress-stripes 1s linear infinite;
}

@keyframes progress-stripes {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 20px 0;
    }
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 13px;
    color: var(--gray-700);
}

.progress-percent {
    font-weight: 600;
}

.progress-time {
    color: var(--gray-600);
}

/* ==================== 动画效果 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.file-info,
.options-section,
.status-section,
.success-section {
    animation: fadeIn 0.4s ease-out;
}

/* ==================== 打印机吐纸动画 ==================== */
.printer-animation {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.printer-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.printer {
    position: relative;
    z-index: 1;
}

.paper {
    position: absolute;
    top: 90px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 0;
    opacity: 0;
}

.paper.ejecting {
    animation: ejectPaper 1.2s ease-out forwards;
}

.paper svg {
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.2));
}

.file-format-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 18px;
    font-weight: 700;
    color: var(--black);
    letter-spacing: 1px;
    text-align: center;
}

/* 纸张吐出动画 */
@keyframes ejectPaper {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(-50px);
    }
    30% {
        opacity: 1;
        transform: translateX(-50%) translateY(0px);
    }
    70% {
        opacity: 1;
        transform: translateX(-50%) translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(30px);
    }
}

/* ==================== 可逆模式样式 ==================== */

/* 模式切换选项卡 */
.mode-tabs {
    display: flex;
    gap: 0;
    margin-bottom: var(--spacing-lg);
    border: 2px solid var(--black);
    background-color: var(--white);
}

.mode-tab {
    flex: 1;
    padding: 12px 24px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    font-weight: 600;
    background-color: var(--white);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    color: var(--gray-500);
    border-right: 2px solid var(--black);
}

.mode-tab:last-child {
    border-right: none;
}

.mode-tab:hover {
    background-color: var(--gray-100);
}

.mode-tab.active {
    background-color: var(--black);
    color: var(--white);
}

/* 密码输入包装器 */
.password-input-wrapper {
    padding: 0;
    border: none;
    background-color: transparent;
    margin-top: 16px;
}

.password-input-title {
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--black);
    letter-spacing: -0.2px;
}

.password-input-desc {
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 11px;
    color: var(--gray-500);
    line-height: 1.4;
    margin-bottom: 12px;
}

.password-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    margin-bottom: 10px;
    transition: all 0.2s ease;
    background-color: var(--white);
}

.password-input:focus {
    outline: none;
    border-color: var(--gray-500);
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.05);
}

.password-input::placeholder {
    color: var(--gray-400);
    font-size: 12px;
}

/* 恢复模式区域 */
.restore-section {
    margin-bottom: var(--spacing-lg);
}

.restore-upload-area {
    border: 2px dashed var(--black);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--white);
}

.restore-upload-area:hover {
    background-color: var(--gray-100);
    border-color: var(--gray-500);
}

.restore-upload-area.dragover {
    background-color: var(--gray-200);
    border-color: var(--black);
    border-style: solid;
}

.restore-file-info {
    border: 2px solid var(--black);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.restore-password-section {
    border: 2px solid var(--black);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.restore-success {
    text-align: center;
    padding: var(--spacing-xl);
}

/* 密码强度指示器 */
.password-strength {
    padding: 8px 0;
    background-color: transparent;
    font-weight: 500;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 11px;
    color: var(--gray-500);
    transition: all 0.2s ease;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .mode-tabs {
        flex-direction: column;
    }

    .mode-tab {
        border-right: none;
        border-bottom: 2px solid var(--black);
    }

    .mode-tab:last-child {
        border-bottom: none;
    }
}