/* 로그인(login.html) / 회원가입(signup.html) 공용 스타일
 * 색상·폰트·간격·모션 토큰은 base.css / animations.css를 그대로 계승한다.
 * 두 페이지 모두 카드 1개만 두고, 서로는 카드 하단 텍스트 링크로 오간다.
 */

.auth_page {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: calc(var(--header_height) + var(--space_14)) var(--page_padding) 96px;
    background:
        radial-gradient(120% 70% at 50% 0%, rgba(43, 161, 255, 0.14) 0%, rgba(43, 161, 255, 0) 62%),
        var(--color_surface);
}

.auth_intro {
    width: 100%;
    max-width: 520px;
    text-align: center;
}

.auth_eyebrow {
    color: var(--color_brand);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.auth_headline {
    margin-top: var(--space_2);
    font-size: 28px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.auth_lead {
    margin-top: var(--space_4);
    color: var(--color_text_sub);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.7;
    letter-spacing: -0.02em;
    word-break: keep-all;
}

.auth_panel {
    width: 100%;
    max-width: 460px;
    margin-top: var(--space_10);
}

.auth_card {
    padding: 32px 24px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--radius_card);
    background-color: var(--color_surface);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.auth_card_title {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.auth_card_desc {
    margin-top: var(--space_2);
    color: var(--color_text_sub);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: -0.02em;
    word-break: keep-all;
}

/* ---------- 폼 ---------- */

.auth_form {
    display: grid;
    gap: var(--space_4);
    margin-top: var(--space_6);
}

.auth_field {
    display: grid;
    gap: var(--space_2);
}

.auth_field_label {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.auth_field_input {
    width: 100%;
    padding: 13px 15px;
    border: 1px solid rgba(0, 0, 0, 0.14);
    border-radius: 10px;
    background-color: #ffffff;
    color: var(--color_text);
    font-family: inherit;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: -0.02em;
    transition:
        border-color 0.22s ease,
        box-shadow 0.22s ease;
}

.auth_field_input::placeholder {
    color: rgba(0, 0, 0, 0.32);
}

.auth_field_input:focus {
    outline: none;
    border-color: var(--color_brand);
    box-shadow: 0 0 0 3px rgba(43, 161, 255, 0.18);
}

.auth_field_input:focus-visible {
    outline: none;
}

.auth_field_hint {
    color: var(--color_text_sub);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: -0.02em;
}

.auth_row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space_3);
}

.auth_checkbox {
    display: inline-flex;
    align-items: center;
    gap: var(--space_2);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: -0.02em;
    cursor: pointer;
}

.auth_checkbox input {
    width: 16px;
    height: 16px;
    accent-color: var(--color_brand);
    cursor: pointer;
}

.auth_text_link {
    color: var(--color_brand);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.02em;
    transition: color 0.22s ease;
}

/* ---------- 버튼 ---------- */

.auth_submit {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 15px;
    border-radius: var(--radius_pill);
    background: linear-gradient(135deg, var(--color_brand) 0%, var(--color_brand_light) 100%);
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
    box-shadow: 0 6px 18px rgba(43, 161, 255, 0.3);
    transition:
        box-shadow 0.22s ease,
        transform 0.22s var(--ease_out_soft);
}

.auth_submit_ghost {
    background: none;
    border: 1px solid var(--color_brand);
    color: var(--color_brand);
    box-shadow: none;
}

.auth_submit:active {
    transform: scale(0.98);
}

/* ---------- 상태 메시지 ---------- */

.auth_message {
    padding: 12px 14px;
    border-radius: 10px;
    background-color: rgba(43, 161, 255, 0.1);
    color: var(--color_brand);
    font-size: 13px;
    font-weight: 600;
    line-height: 1.5;
    letter-spacing: -0.02em;
    word-break: keep-all;
}

.auth_message.has_error {
    background-color: rgba(214, 45, 45, 0.08);
    color: #c62828;
}

.auth_switch {
    margin-top: var(--space_5);
    color: var(--color_text_sub);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: -0.02em;
    text-align: center;
}

.auth_switch a {
    color: var(--color_brand);
    font-weight: 600;
}

/* ========================================================
 * 반응형
 * ======================================================== */

@media (min-width: 768px) {
    .auth_page {
        padding-top: calc(var(--header_height) + 72px);
    }

    .auth_headline {
        font-size: 36px;
    }

    .auth_lead {
        font-size: 16px;
    }

    .auth_panel {
        max-width: 500px;
    }

    .auth_intro {
        max-width: 640px;
    }

    .auth_card {
        padding: 40px 32px;
    }

    .auth_card_title {
        font-size: 22px;
    }
}

@media (min-width: 1024px) {
    .auth_page {
        padding-top: calc(var(--header_height) + 96px);
        padding-bottom: 120px;
    }

    .auth_headline {
        font-size: 42px;
    }

    .auth_panel {
        max-width: 520px;
    }

    .auth_card {
        padding: 48px 40px;
    }
}

@media (hover: hover) {
    .auth_submit:hover {
        box-shadow: 0 10px 26px rgba(43, 161, 255, 0.48);
        transform: translateY(-2px);
    }

    .auth_submit_ghost:hover {
        background-color: rgba(43, 161, 255, 0.08);
        box-shadow: none;
        transform: translateY(-2px);
    }

    .auth_text_link:hover,
    .auth_switch a:hover {
        color: var(--color_brand_light);
        text-decoration: underline;
    }
}