/* === CSS 变量体系（DeepSeek 风格：科技蓝） === */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #60a5fa;
    --color-primary-gradient: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #60a5fa 100%);
    --color-primary-shadow: rgba(37, 99, 235, 0.2);
    --color-primary-shadow-sm: rgba(37, 99, 235, 0.1);
    --color-focus: #2563eb;
    --color-focus-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    --color-link: #2563eb;
    --color-link-hover: #1d4ed8;
    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;
    --color-bg-mint: linear-gradient(180deg, #eff6ff 0%, #dbeafe 100%);
    --border-radius-sm: 8px;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
    --color-border: #e2e8f0;
    --color-text: #0f172a;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
}

/* === 公共样式 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

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

/* 消息提示 */
.message {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
    text-align: center;
}

.message--error {
    background: #fee2e2;
    color: #dc2626;
}

.message--success {
    background: #dbeafe;
    color: #2563eb;
}