:root {
    --blue-950: #071b33;
    --blue-900: #0f2747;
    --blue-800: #153a66;
    --blue-700: #1e4f8f;
    --blue-600: #2563eb;
    --gray-900: #1f2937;
    --gray-700: #374151;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --white: #ffffff;
    --danger: #d92d20;
}

* {
    box-sizing: border-box;
}

body.login-body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.10), transparent 34%),
        linear-gradient(180deg, #f7faff 0%, #edf3fb 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Malgun Gothic", "Apple SD Gothic Neo", Arial, sans-serif;
    color: var(--gray-900);
}

.login-page {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 18px;
}

.login-panel {
    width: min(480px, 100%);
    text-align: center;
}

.login-header {
    margin-bottom: 24px;
}

.login-brand {
    font-size: 34px;
    font-weight: 900;
    letter-spacing: -0.055em;
    color: var(--blue-950);
    line-height: 1.15;
}

.login-desc {
    margin-top: 10px;
    font-size: 15px;
    color: var(--gray-500);
    letter-spacing: -0.02em;
}

.login-box {
    width: 100%;
    background: var(--white);
    border: 1px solid var(--gray-200);
    padding: 46px 42px 38px;
    border-radius: 18px;
    box-shadow: 0 22px 55px rgba(15, 39, 71, 0.12);
}

.login-field {
    width: 100%;
}

.login-box input {
    width: 100%;
    height: 54px;
    border: 0;
    border-bottom: 2px solid var(--gray-300);
    border-radius: 0;
    padding: 0 4px;
    margin-bottom: 26px;
    font-size: 17px;
    outline: none;
    background: transparent;
    color: var(--gray-900);
}

.login-box input::placeholder {
    color: var(--gray-400);
}

.login-box input:focus {
    border-bottom-color: var(--blue-700);
    box-shadow: none;
}

.login-error {
    margin: 0 0 20px;
    padding: 12px 14px;
    background: #fff1f0;
    color: var(--danger);
    border-radius: 10px;
    font-size: 14px;
    text-align: left;
}

.login-button {
    width: 100%;
    height: 54px;
    border: 0;
    border-radius: 12px;
    background: var(--blue-800);
    color: var(--white);
    font-size: 17px;
    font-weight: 900;
    cursor: pointer;
    margin-top: 6px;
    transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.login-button:hover {
    background: var(--blue-700);
    box-shadow: 0 10px 22px rgba(30, 79, 143, 0.22);
}

.login-button:active {
    transform: translateY(1px);
}

.login-footer {
    margin-top: 20px;
    font-size: 13px;
    color: var(--gray-500);
    text-align: center;
    letter-spacing: -0.02em;
}

@media (max-width: 520px) {
    body.login-body {
        align-items: flex-start;
    }

    .login-page {
        padding-top: 70px;
    }

    .login-panel {
        width: min(420px, 100%);
    }

    .login-brand {
        font-size: 29px;
    }

    .login-desc {
        font-size: 14px;
    }

    .login-box {
        padding: 36px 28px 32px;
        border-radius: 16px;
    }

    .login-box input {
        height: 52px;
        font-size: 16px;
    }

    .login-button {
        height: 52px;
        font-size: 16px;
    }
}