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

/* ========================================
   主题 1: Apple Style (经典苹果风)
   ======================================== */
:root,
[data-theme="apple"] {
    --bg-primary: #f5f5f7;
    --bg-container: #ffffff;
    --bg-input: #ffffff;
    --bg-input-hover: #f9f9f9;
    --bg-hint: #f5f5f7;

    --color-primary: #0071e3;
    --color-primary-hover: #0077ed;
    --color-accent: #06c;
    --color-success: #30d158;

    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-hint: #6e6e73;

    --border-color: #d2d2d7;
    --border-focus: #0071e3;

    --shadow-sm: 0 2px 16px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.16);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   主题 2: Glassmorphism (玻璃拟态)
   ======================================== */
[data-theme="glass"] {
    --bg-primary: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    --bg-container: rgba(255, 255, 255, 0.1);
    --bg-input: rgba(255, 255, 255, 0.05);
    --bg-input-hover: rgba(255, 255, 255, 0.15);
    --bg-hint: rgba(255, 255, 255, 0.08);

    --color-primary: #00d4ff;
    --color-primary-hover: #00bfea;
    --color-accent: #0099ff;
    --color-success: #00ff88;

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-hint: rgba(255, 255, 255, 0.6);

    --border-color: rgba(255, 255, 255, 0.18);
    --border-focus: rgba(255, 255, 255, 0.4);

    --shadow-sm: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 12px 48px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 16px 64px rgba(0, 0, 0, 0.5);

    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;

    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    --glass-blur: blur(10px);
}

/* ========================================
   主题 3: Minimal Monochrome (极简黑白)
   ======================================== */
[data-theme="minimal"] {
    --bg-primary: #fafafa;
    --bg-container: #ffffff;
    --bg-input: #ffffff;
    --bg-input-hover: #f5f5f5;
    --bg-hint: #f9f9f9;

    --color-primary: #0066ff;
    --color-primary-hover: #0052cc;
    --color-accent: #000000;
    --color-success: #000000;

    --text-primary: #000000;
    --text-secondary: #666666;
    --text-hint: #999999;

    --border-color: #e5e5e5;
    --border-focus: #000000;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --transition: all 0.2s ease;
}

/* ========================================
   主题 4: Tech Gradient (现代科技)
   ======================================== */
[data-theme="tech"] {
    --bg-primary: linear-gradient(135deg, #e0e7ff 0%, #f0f4f8 100%);
    --bg-container: rgba(255, 255, 255, 0.9);
    --bg-input: #ffffff;
    --bg-input-hover: #f8fafc;
    --bg-hint: #f1f5f9;

    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-accent: #6366f1;
    --color-success: #10b981;

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-hint: #94a3b8;

    --border-color: #cbd5e1;
    --border-focus: #3b82f6;

    --shadow-sm: 0 4px 12px rgba(59, 130, 246, 0.1);
    --shadow-md: 0 8px 24px rgba(59, 130, 246, 0.15);
    --shadow-hover: 0 12px 32px rgba(59, 130, 246, 0.2);

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;

    --transition: all 0.3s ease-out;
}

/* ========================================
   全局布局
   ======================================== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

/* 玻璃主题特殊处理 */
[data-theme="glass"] body,
[data-theme="tech"] body {
    background-image: var(--bg-primary);
}

.container {
    background: var(--bg-container);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    width: 100%;
    padding: 40px;
    transition: var(--transition);
}

/* 玻璃效果 */
[data-theme="glass"] .container {
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
}

/* ========================================
   主题切换器
   ======================================== */
.theme-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
    background: var(--bg-container);
    padding: 8px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

[data-theme="glass"] .theme-switcher {
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
}

.theme-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 12px;
    background: transparent;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
}

.theme-btn:hover {
    background: var(--bg-input-hover);
    border-color: var(--color-primary);
}

.theme-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.theme-icon {
    font-size: 20px;
}

.theme-name {
    font-size: 11px;
    font-weight: 600;
}

/* ========================================
   标题和文字
   ======================================== */
h1 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 28px;
    text-align: center;
    font-weight: 700;
    transition: var(--transition);
}

.subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 30px;
    font-size: 14px;
    transition: var(--transition);
}

/* ========================================
   表单元素
   ======================================== */
.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
    transition: var(--transition);
}

/* 文件上传区域 */
.file-input-wrapper {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    text-align: center;
    background: var(--bg-input);
    cursor: pointer;
    transition: var(--transition);
}

.file-input-wrapper:hover {
    border-color: var(--color-primary);
    background: var(--bg-input-hover);
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.file-label {
    color: var(--color-primary);
    font-weight: 600;
    transition: var(--transition);
}

.file-hint {
    font-size: 12px;
    color: var(--text-hint);
    margin-top: 8px;
}

.selected-file {
    margin-top: 10px;
    color: var(--color-success);
    font-size: 13px;
    font-weight: 500;
}

/* 下拉选择框 */
select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: var(--transition);
    cursor: pointer;
}

select:focus {
    outline: none;
    border-color: var(--border-focus);
}

/* 单选按钮组 */
.radio-group {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: normal;
    color: var(--text-primary);
    transition: var(--transition);
}

.radio-label input[type="radio"] {
    margin-right: 8px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* 滑块 */
.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 0 8px rgba(0, 113, 227, 0.1);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
}

.slider-value {
    min-width: 45px;
    text-align: center;
    font-weight: 700;
    color: var(--color-primary);
    font-size: 18px;
    transition: var(--transition);
}

/* 参数提示 */
.param-hint {
    background: var(--bg-hint);
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-hint);
    margin-top: 10px;
    border-left: 4px solid var(--color-primary);
    transition: var(--transition);
}

/* ========================================
   按钮
   ======================================== */
.submit-btn {
    width: 100%;
    padding: 15px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.submit-btn:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Minimal 主题按钮特殊样式 */
[data-theme="minimal"] .submit-btn {
    background: var(--text-primary);
}

[data-theme="minimal"] .submit-btn:hover:not(:disabled) {
    background: var(--color-primary);
}

/* ========================================
   底部链接
   ======================================== */
.links {
    margin-top: 25px;
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
}

.links a {
    color: var(--color-primary);
    text-decoration: none;
    margin: 0 15px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .container {
        padding: 30px 20px;
    }

    .theme-switcher {
        top: 10px;
        right: 10px;
        padding: 6px;
        gap: 6px;
    }

    .theme-btn {
        padding: 8px 10px;
    }

    .theme-icon {
        font-size: 18px;
    }

    .theme-name {
        font-size: 10px;
    }

    h1 {
        font-size: 24px;
    }

    .radio-group {
        flex-direction: column;
        gap: 12px;
    }
}

/* ========================================
   动画效果
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container {
    animation: fadeIn 0.5s ease-out;
}

/* 主题切换过渡动画 */
body,
.container,
h1,
.subtitle,
label,
.file-label,
.radio-label,
.slider-value,
.param-hint,
select,
.submit-btn,
.links a {
    transition: var(--transition);
}