:root {
    --bg: #F7F9FC;
    --bg-dark: #0B0F19;
    --bg-card-dark: #1C2230;
    --fg: #0F172A;
    --fg-light: #FFFFFF;
    --muted: #F1F5F9;
    --muted-fg: #64748B;
    --muted-fg-light: #94A3B8;
    --accent: #0052FF;
    --accent-2: #2F6BFF;
    --accent-fg: #FFFFFF;
    --border: #E2E8F0;
    --border-dark: #2A3344;
    --card: #FFFFFF;
    --card-dark: #1C2230;

    /* 华为红 - 标题/Logo点缀 */
    --huawei-red: #C7000B;
    --huawei-red-dark: #8A0008;
    --huawei-red-light: #E60012;

    /* 辅助色 */
    --tech-blue: #2F6BFF;
    --data-cyan: #00C2FF;
    --health-green: #00A86B;

    /* 字体 - HarmonyOS Sans SC 优先 */
    --font-display: "HarmonyOS Sans SC", "HarmonyOS Sans", "Microsoft YaHei", "微软雅黑", sans-serif;
    --font-body: "HarmonyOS Sans SC", "HarmonyOS Sans", "Microsoft YaHei", "微软雅黑", sans-serif;
    --font-mono: "HarmonyOS Sans SC", Consolas, "Courier New", monospace;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.08);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);
    --shadow-accent: 0 4px 14px rgba(0,82,255,0.25);
    --shadow-accent-lg: 0 8px 24px rgba(0,82,255,0.35);
    --shadow-red: 0 4px 14px rgba(199,0,11,0.25);

    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}