/* ===== 全局变量 ===== */
:root {
    /* Light Theme */
    --primary: #6366f1;
    --secondary: #8b5cf6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.05);
    --shadow-hover: rgba(0, 0, 0, 0.1);
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --accent: #06b6d4;
}

[data-theme="mint"] {
    --primary: #10b981;
    --secondary: #34d399;
    --bg-primary: #f0fdf4;
    --bg-secondary: #ecfdf5;
    --bg-card: #ffffff;
    --text-primary: #065f46;
    --text-secondary: #047857;
    --border: #a7f3d0;
    --shadow: rgba(16, 185, 129, 0.1);
    --shadow-hover: rgba(16, 185, 129, 0.2);
    --gradient-1: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-2: linear-gradient(135deg, #34d399 0%, #6ee7b7 100%);
    --gradient-3: linear-gradient(135deg, #059669 0%, #10b981 100%);
    --accent: #34d399;
}

[data-theme="sky"] {
    --primary: #0ea5e9;
    --secondary: #38bdf8;
    --bg-primary: #f0f9ff;
    --bg-secondary: #e0f2fe;
    --bg-card: #ffffff;
    --text-primary: #0c4a6e;
    --text-secondary: #0369a1;
    --border: #bae6fd;
    --shadow: rgba(14, 165, 233, 0.1);
    --shadow-hover: rgba(14, 165, 233, 0.2);
    --gradient-1: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 100%);
    --gradient-2: linear-gradient(135deg, #38bdf8 0%, #7dd3fc 100%);
    --gradient-3: linear-gradient(135deg, #0284c7 0%, #0ea5e9 100%);
    --accent: #38bdf8;
}

[data-theme="lavender"] {
    --primary: #a855f7;
    --secondary: #c084fc;
    --bg-primary: #faf5ff;
    --bg-secondary: #f3e8ff;
    --bg-card: #ffffff;
    --text-primary: #581c87;
    --text-secondary: #7c3aed;
    --border: #ddd6fe;
    --shadow: rgba(168, 85, 247, 0.1);
    --shadow-hover: rgba(168, 85, 247, 0.2);
    --gradient-1: linear-gradient(135deg, #a855f7 0%, #c084fc 100%);
    --gradient-2: linear-gradient(135deg, #c084fc 0%, #d8b4fe 100%);
    --gradient-3: linear-gradient(135deg, #9333ea 0%, #a855f7 100%);
    --accent: #c084fc;
}

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

body {
    font-family: 'Inter', 'Poppins', '思源黑体', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== 头部 ===== */
.header {
    background: var(--bg-card);
    padding: 2rem;
    box-shadow: 0 2px 10px var(--shadow);
    border-bottom: 1px solid var(--border);
}

.header-content {
    text-align: center;
    margin-bottom: 1.5rem;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    font-family: 'Poppins', sans-serif;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

.theme-selector {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.theme-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.theme-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.theme-btn.active {
    background: var(--gradient-1);
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 15px var(--shadow-hover);
}

/* ===== 主内容区 ===== */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* ===== 卡片 ===== */
.card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 30px var(--shadow-hover);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.card h2 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--text-primary);
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 0.95rem;
    font-family: 'Inter', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: var(--bg-card);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== 按钮 ===== */
.btn-primary {
    width: 100%;
    padding: 1rem;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
    box-shadow: 0 4px 15px var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-hover);
}

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

.btn-clear {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
    white-space: nowrap;
}

.btn-clear:hover {
    border-color: var(--text-secondary);
    background: var(--bg-card);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

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

.btn-secondary {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.btn-secondary:hover {
    border-color: var(--primary);
    background: var(--bg-card);
    transform: translateY(-2px);
}

/* ===== 预览区 ===== */
.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.preview-actions {
    display: flex;
    gap: 0.5rem;
}

.preview-content {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 12px;
    padding: 1.5rem;
    border: 2px solid var(--border);
    min-height: 500px;
    max-height: 800px;
    overflow-y: auto;
}

.preview-content pre {
    margin: 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.preview-content code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background: transparent;
    padding: 0;
    border-radius: 0;
}

/* ===== 页脚 ===== */
.footer {
    text-align: center;
    padding: 2rem;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    margin-top: auto;
}

.footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.footer a:hover {
    text-decoration: underline;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .logo {
        font-size: 2rem;
    }

    .main-content {
        padding: 1rem;
        gap: 1.5rem;
    }

    .card {
        padding: 1.5rem;
    }

    .theme-selector {
        gap: 0.3rem;
    }

    .theme-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn-clear {
        width: 100%;
    }
}

/* ===== 滚动条样式 ===== */
.preview-content::-webkit-scrollbar {
    width: 8px;
}

.preview-content::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.preview-content::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

.preview-content::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}