/* --- 1. 全局变量与样式重置 --- */
:root {
    --theme-color: #ff6700;
    --theme-color-dark: #e55c00;
    --text-primary: #1d2129;
    --text-secondary: #5f6368;
    --bg-color: #f7f8fa;
    --panel-bg: #ffffff;
    --border-color: #e0e0e0;
    --focus-ring-color: rgba(255, 103, 0, 0.3);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius-md: 8px;
    --radius-sm: 4px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    max-width: 960px;
    margin: 0 auto;
    padding: 40px 20px;
    color: var(--text-primary);
    background-color: var(--bg-color);
}

/* --- 2. 标题与主布局 --- */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--theme-color), #ff9800);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    margin-bottom: 40px;
}

.generator-container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    justify-content: center;
    align-items: flex-start;
}

/* --- 3. Logo预览区域 --- */
.preview-wrapper {
    position: sticky;
    top: 40px;
}

.logo-preview {
    width: 320px;
    height: 320px;
    box-shadow: var(--shadow);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    transition: box-shadow 0.3s ease;
}
.logo-preview:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.logo-shape {
    width: 100%;
    height: 100%;
    display: flex;
    padding: 20px;
    transition: all 0.2s ease-in-out;
    overflow: hidden;
}

.logo-text {
    padding: 0;
    word-break: break-all;
    white-space: pre-wrap;
    transition: all 0.2s ease-in-out;
}

.font-preview {
    font-size: 1rem;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--panel-bg);
    text-align: center;
    color: var(--text-secondary);
}

/* --- 4. 控制面板 --- */
.controls {
    width: 400px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.control-group {
    background-color: var(--panel-bg);
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.control-group h3 {
    display: flex;
    align-items: center;
    margin: 0;
    padding-bottom: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.control-row {
    display: flex;
    gap: 10px;
}
.control-row > .control-item {
    flex: 1;
}

label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
label span {
    font-weight: 400;
    color: var(--theme-color);
    background-color: #fff2e5;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

/* --- 5. 表单元素样式 --- */
input[type="text"], select, textarea {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    width: 100%;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input[type="text"]:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--theme-color);
    box-shadow: 0 0 0 3px var(--focus-ring-color);
}

textarea {
    resize: vertical;
    min-height: 70px;
}

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding-left: 10px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.color-input-wrapper:focus-within {
     outline: none;
    border-color: var(--theme-color);
    box-shadow: 0 0 0 3px var(--focus-ring-color);
}
.color-input-wrapper input[type="text"] {
    border: none;
    padding-left: 0;
}
.color-input-wrapper input[type="text"]:focus {
    box-shadow: none;
}
.color-input-wrapper input[type="color"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    padding: 0;
    width: 28px;
    height: 28px;
    background-color: transparent;
    border: none;
    cursor: pointer;
}
.color-input-wrapper input[type="color"]::-webkit-color-swatch {
    border-radius: var(--radius-sm);
    border: none;
}
.color-input-wrapper input[type="color"]::-moz-color-swatch {
    border-radius: var(--radius-sm);
    border: none;
}

/* 自定义滑块样式 */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: #eee;
    border-radius: 3px;
    outline: none;
    margin: 8px 0;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--theme-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}
input[type="range"]:focus::-webkit-slider-thumb {
     box-shadow: 0 0 0 4px var(--focus-ring-color);
}
input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--theme-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

/* 预设颜色 */
.preset-colors {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.color-preset {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 0 0 1px var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}
.color-preset:hover {
    transform: scale(1.1);
}
.color-preset.active {
    box-shadow: 0 0 0 2px var(--theme-color);
}

/* 对齐按钮 */
.toggle-buttons {
    display: flex;
    gap: 5px;
}
.toggle-buttons button {
    flex: 1;
    background-color: #f0f0f0;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}
.toggle-buttons button:hover {
    background-color: #e5e5e5;
}
.toggle-buttons button.active {
    background-color: var(--theme-color);
    color: white;
    border-color: var(--theme-color);
}

/* 下载按钮 */
.buttons {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}
.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    flex: 1;
}
.btn-primary {
    background-color: var(--theme-color);
    color: white;
}
.btn-primary:hover {
    background-color: var(--theme-color-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.btn-secondary {
    background-color: var(--panel-bg);
    color: var(--theme-color);
    border: 1px solid var(--theme-color);
}
.btn-secondary:hover {
    background-color: #fff2e5;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

/* --- 响应式设计 --- */
@media (max-width: 768px) {
    body { 
        padding: 20px; 
    }
    .generator-container {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    
    .preview-wrapper {
        position: sticky;
        top: 0; 
        z-index: 10;
        width: 100%;
        background: var(--panel-bg);
        padding-top: 20px; 
        padding-bottom: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .logo-preview {
        width: 280px;
        height: 280px;
    }
    .font-preview {
        width: 280px;
    }
    .controls {
        width: 100%;
    }
}

/* 字体类 */
.font-helvetica { font-family: 'Helvetica Neue', Arial, sans-serif; }
.font-pingfang { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; }
.font-roboto { font-family: 'Roboto', sans-serif; }
.font-montserrat { font-family: 'Montserrat', sans-serif; }
.font-lato { font-family: 'Lato', sans-serif; }
.font-opensans { font-family: 'Open Sans', sans-serif; }