/* src/css/styles.css */

/* ===========================
   变量定义
   =========================== */
:root {
    /* 颜色系统 */
    --primary-color: #6a11cb;
    --primary-dark: #5a67d8;
    --primary-light: #7f9cf5;
    --secondary-color: #2575fc;
    --success-color: #48bb78;
    --warning-color: #f6ad55;
    --error-color: #f56565;
    --info-color: #4299e1;
    
    /* 中性色 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* 间距系统 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 字体系统 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: Consolas, Monaco, "Courier New", monospace;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 动画 */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
    
    /* 布局 */
    --max-width: 1400px;
    --border-radius: 8px;
    --spacing-unit: 1rem; /* 16px */
    --primary-gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --text-color: #333;
    --light-text-color: #fff;
    --background-color: #f4f7f6;
    --container-background: #fff;
    --border-color: #ddd;
    --input-border-color: #ccc;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-unit);
}

/* ===========================
   布局容器
   =========================== */
.converter-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ===========================
   头部样式
   =========================== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 20s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.header-content {
    position: relative;
    z-index: 1;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.logo {
    width: 48px;
    height: 48px;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
}

.tagline {
    font-size: 1.125rem;
    opacity: 0.9;
    margin: 0;
}

/* ===========================
   主内容区域
   =========================== */
.main-content {
    flex: 1;
}

.controls {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

/* ===========================
   表单控件
   =========================== */
.control-group {
    margin-bottom: var(--spacing-lg);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
}

.label-text {
    font-size: 1rem;
}

.label-hint {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--gray-500);
}

.control-group input,
.control-group select,
.control-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: calc(var(--border-radius) / 2);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background-color: white;
}

.control-group input:focus,
.control-group select:focus,
.control-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.control-group textarea {
    min-height: 200px;
    max-height: 400px;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* ===========================
   选项容器
   =========================== */
.options-container {
    margin: var(--spacing-xl) 0;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-right: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label span {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.checkbox-label:hover span {
    color: var(--gray-900);
}

/* ===========================
   信息框
   =========================== */
.info-box {
    background: linear-gradient(135deg, #e0f2fe 0%, #ddd6fe 100%);
    border: 1px solid rgba(147, 197, 253, 0.5);
    border-radius: calc(var(--border-radius) / 2);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.info-box h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.info-box ul {
    margin-left: var(--spacing-lg);
    color: var(--gray-700);
    font-size: 0.875rem;
}

.info-box li {
    margin-bottom: var(--spacing-xs);
}

.info-box strong {
    color: var(--gray-900);
}

/* ===========================
   按钮样式
   =========================== */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    border: none;
    border-radius: calc(var(--border-radius) / 2);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-icon {
    flex-shrink: 0;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ===========================
   加载动画
   =========================== */
.loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.loader.active {
    display: inline-block;
}

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

/* ===========================
   转换状态
   =========================== */
.conversion-status {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.conversion-status h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--gray-800);
}

.status-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

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

.status-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.status-icon svg {
    transition: all var(--transition-base);
}

.status-pending {
    background: var(--gray-200);
    color: var(--gray-500);
}

.status-processing {
    background: var(--info-color);
    color: white;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.status-success {
    background: var(--success-color);
    color: white;
}

.status-success svg {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: checkmark 0.5s forwards;
}

@keyframes checkmark {
    to { stroke-dashoffset: 0; }
}

.status-error {
    background: var(--error-color);
    color: white;
}

.status-text {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.conversion-result {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: calc(var(--border-radius) / 2);
    display: none;
}

.conversion-result.show {
    display: block;
}

/* ===========================
   预览容器
   =========================== */
.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.preview-panel {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.preview-header {
    background: var(--gray-50);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.preview-header h3 {
    font-size: 1rem;
    color: var(--gray-700);
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: calc(var(--border-radius) / 2);
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--gray-200);
    color: var(--gray-700);
}

.preview-content {
    padding: var(--spacing-lg);
    min-height: 400px;
    position: relative;
}

#htmlPreview {
    width: 100%;
    height: 400px;
    border: 1px solid var(--gray-200);
    border-radius: calc(var(--border-radius) / 2);
}

.info-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--gray-400);
}

.info-placeholder svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* ===========================
   页脚
   =========================== */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.separator {
    margin: 0 var(--spacing-sm);
    color: var(--gray-300);
}

/* ===========================
   隐藏渲染区域
   =========================== */
.hidden-render-area {
    position: absolute;
    left: -9999px;
    top: -9999px;
    width: 1920px;
    height: 1080px;
    overflow: hidden;
}

/* ===========================
   响应式设计
   =========================== */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.75rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .checkbox-group {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* ===========================
   打印样式
   =========================== */
@media print {
    body {
        background: white;
    }
    
    .header,
    .footer,
    .button-group,
    .conversion-status {
        display: none;
    }
}

/* ===========================
   动画效果
   =========================== */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ===========================
   辅助类
   =========================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* Global Styles */
.app-container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--container-background);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-color);
    overflow: hidden;
}

/* Header */
.app-header {
    background: var(--primary-gradient);
    color: var(--light-text-color);
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    text-align: center;
}

.app-header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.app-header p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Main Content */
.app-main {
    padding: calc(var(--spacing-unit) * 2);
}

section {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.form-group {
    margin-bottom: var(--spacing-unit);
}

.form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: #555;
}

textarea,
select,
input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--input-border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

textarea:focus,
select:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(var(--primary-color), 0.2);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-unit);
}

.checkbox-group {
    display: flex;
    gap: var(--spacing-unit);
    margin-top: var(--spacing-unit);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 0.5rem;
    accent-color: var(--primary-color);
}

/* Usage Instructions */
.usage-instructions {
    background-color: #e7f3fe;
    border: 1px solid #b3d8fd;
    border-radius: var(--border-radius);
    padding: var(--spacing-unit);
}

.usage-instructions h3 {
    font-size: 1.1rem;
    color: #0c5460;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
}

.usage-instructions h3 span {
    margin-right: 0.5rem;
}

.usage-instructions ul {
    list-style-type: none;
    padding-left: 0;
    font-size: 0.9rem;
    color: #31708f;
}

.usage-instructions li {
    margin-bottom: 8px;
    color: var(--gray-600);
}

.usage-tip {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #e8f5e8 0%, #f0f8f0 100%);
    border: 1px solid #c3e6c3;
    border-radius: var(--border-radius);
    color: var(--gray-700);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-unit);
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: bold;
    text-align: center;
    transition: background-color 0.2s ease, transform 0.1s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    opacity: 0.9;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--light-text-color);
}

.btn-secondary {
    background-color: #e9ecef;
    color: var(--text-color);
    border: 1px solid #ced4da;
}

.btn-spinner {
    width: 1em;
    height: 1em;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--light-text-color);
    animation: spin 1s linear infinite;
    margin-right: 0.5em;
}

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

/* Notification Area */
.notification-area {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.notification {
    padding: 1rem;
    border-radius: var(--border-radius);
    color: var(--light-text-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    opacity: 0;
    transform: translateX(100%);
    animation: slideIn 0.5s forwards, fadeOut 0.5s 4.5s forwards;
}

.notification.info { background-color: #17a2b8; }
.notification.success { background-color: #28a745; }
.notification.warning { background-color: #ffc107; color: #333;}
.notification.error { background-color: #dc3545; }

@keyframes slideIn {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }
    .app-main {
        padding: var(--spacing-unit);
    }
    .options-grid {
        grid-template-columns: 1fr; /* Stack on smaller screens */
    }
    .action-buttons {
        flex-direction: column;
    }
    .btn {
        width: 100%;
    }
}