:root {
        --bg-top: #0f2d40;
        --bg-bottom: #1e5f6e;
        --card: #ffffff;
        --text-main: #16313c;
        --text-sub: #5f7681;
        --accent: #0f8b8d;
        --accent-hover: #0c7375;
        --danger: #d7263d;
        --success: #1f9d55;
        --line: #d9e2e8;
        --shadow: 0 20px 45px rgba(8, 30, 40, 0.28);
    }
    * { box-sizing: border-box; }
    body {
        margin: 0;
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(145deg, var(--bg-top), var(--bg-bottom));
        font-family: "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
        color: var(--text-main);
        padding: 24px;
    }
    .login-wrap {
        width: 100%;
        max-width: 420px;
        background: var(--card);
        border-radius: 18px;
        box-shadow: var(--shadow);
        overflow: hidden;
    }
    .login-head {
        padding: 28px 28px 16px;
        background: radial-gradient(circle at 10% 10%, #d9f4f2 0%, #ffffff 58%);
    }
    .login-head h1 { margin: 0; font-size: 28px; letter-spacing: -0.6px; }
    .login-head p  { margin: 8px 0 0; color: var(--text-sub); font-size: 14px; }
    .login-body { padding: 24px 28px 28px; }
    .notice {
        border-radius: 10px;
        padding: 10px 12px;
        font-size: 13px;
        margin-bottom: 14px;
    }
    .notice-error   { background: #fdebee; border: 1px solid #f4b8c0; color: var(--danger); }
    .notice-success { background: #e9f9ef; border: 1px solid #bdeccf; color: var(--success); }
    .field { margin-bottom: 14px; }
    .field label {
        display: block;
        margin-bottom: 7px;
        font-size: 13px;
        font-weight: 700;
        color: var(--text-main);
    }
    .field input {
        width: 100%;
        border: 1px solid var(--line);
        border-radius: 10px;
        padding: 12px 13px;
        font-size: 14px;
        outline: none;
        transition: border-color 0.15s ease;
    }
    .field input:focus { border-color: var(--accent); }
    .submit-btn {
        width: 100%;
        border: 0;
        border-radius: 10px;
        padding: 12px;
        background: var(--accent);
        color: #fff;
        font-size: 15px;
        font-weight: 700;
        cursor: pointer;
        transition: background-color 0.2s ease;
    }
    .submit-btn:hover { background: var(--accent-hover); }
    .guide { margin-top: 12px; color: var(--text-sub); font-size: 12px; text-align: center; }
    @media (max-width: 560px) {
        .login-head, .login-body { padding-left: 20px; padding-right: 20px; }
    }