/* 全局变量 */
:root {
    --brat-green: #8ACE00;
    --brat-black: #000000;
    --brat-white: #FFFFFF;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-brat: Arial, sans-serif;
    
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* 深色模式变量 */
body.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
    --border-color: #404040;
}

/* 浅色模式变量 */
body:not(.dark-mode) {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

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

/* 导航栏 */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

body.dark-mode .navbar {
    background-color: rgba(26, 26, 26, 0.95);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--brat-green);
    text-transform: lowercase;
    font-family: var(--font-brat);
}

.nav-menu {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.lang-switch,
.theme-switch {
    background: none;
    border: 2px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    color: var(--text-primary);
}

.lang-switch:hover,
.theme-switch:hover {
    border-color: var(--brat-green);
    transform: translateY(-2px);
}

/* Hero区域 */
.hero {
    padding: 4rem 0 2rem;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--brat-green) 0%, #6fb500 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* 主内容区 */
.main-content {
    padding: 2rem 0;
}

.generator-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

/* 输入区域 */
.input-section {
    margin-bottom: 2rem;
}

.text-input {
    width: 100%;
    min-height: 60px;
    padding: 1rem;
    font-size: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    resize: vertical;
    font-family: var(--font-brat);
    text-transform: lowercase;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.text-input:focus {
    outline: none;
    border-color: var(--brat-green);
    box-shadow: 0 0 0 3px rgba(138, 206, 0, 0.1);
}

/* 样式选项 */
.style-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.button-group {
    display: flex;
    gap: 0.5rem;
}

.style-btn {
    flex: 1;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border-color);
    background-color: var(--bg-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    color: var(--text-primary);
}

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

.style-btn.active {
    background-color: var(--brat-green);
    border-color: var(--brat-green);
    color: black;
}

/* 预览区域 */
.preview-section {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

#previewCanvas {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

/* 操作按钮 */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.action-btn.primary {
    background-color: var(--brat-green);
    color: black;
}

.action-btn.primary:hover {
    background-color: #7bb800;
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(138, 206, 0, 0.3);
}

.action-btn.secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.action-btn.secondary:hover {
    border-color: var(--brat-green);
    transform: translateY(-2px);
}

/* 特色展示 */
.features {
    padding: 4rem 0;
    background-color: var(--bg-secondary);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 教程部分 */
.tutorial {
    padding: 4rem 0;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--brat-green);
    color: black;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.step-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.step-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 页脚 */
.footer {
    background-color: var(--bg-secondary);
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    text-align: center;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--brat-green);
}

/* 工具提示 */
.tooltip {
    position: fixed;
    background-color: var(--gray-800);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip.show {
    opacity: 1;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-300);
    border-top-color: var(--brat-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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