:root {
        --bg-page: #f5f7fb;
        --surface: #ffffff;
        --border: #e2e8f0;
        --text-main: #0f172a;
        --text-muted: #64748b;

        --primary: #3478ff;
        --primary-hover: #255de0;

        --pastel-blue:   #e8f3ff;
        --pastel-cyan:   #e6fcff;
        --pastel-yellow: #fff7c7;
        --pastel-red:    #ffe5eb;
        --pastel-purple: #f2e9ff;
        --pastel-green:  #e8ffe8;

        --radius-lg: 16px;
        --radius-md: 12px;
        --radius-sm: 8px;
        --shadow-soft: 0 2px 8px rgba(15, 23, 42, 0.06);
    }

    * {
        box-sizing: border-box;
    }

    body {
        margin: 0;
        background: var(--bg-page);
        color: var(--text-main);
        font-family: 'IBM Plex Sans', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        letter-spacing: -0.01em;
        font-size: 14px;
    }

    a {
        color: var(--primary);
        text-decoration: none;
    }

    a:hover {
        text-decoration: underline;
    }

    h1 {
        font-weight: 600;
        letter-spacing: -0.015em;
    }
    .message {
        margin-top: 12px;
        padding: 8px 10px;
        border-radius: 10px;
        font-size: 13px;
    }

    .message.ok {
        border: 1px solid #81c995;
        background: #e6f4ea;
    }

    .message.error {
        border: 1px solid #f97373;
        background: #fee2e2;
    }

    .is-hidden {
        display: none;
    }