:root {
    --forest-dark: #07140f;
    --forest: #123c2c;
    --forest-light: #245d45;
    --gold: #c8a96a;
    --gold-light: #e4cf9d;
    --ivory: #f5f1e7;
    --white: #ffffff;
    --text-dark: #162019;
    --error: #f0a0a0;
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    min-height: 100vh;
    margin: 0;

    display: grid;
    grid-template-rows: auto 1fr auto;

    color: var(--ivory);
    font-family:
        "Times New Roman",
        "Yu Mincho",
        "Hiragino Mincho ProN",
        serif;

    background:
        linear-gradient(rgba(4, 14, 10, 0.77),
            rgba(4, 14, 10, 0.91)),
        url("../imagea/car01.jpg") center / cover fixed no-repeat;
}

a {
    color: inherit;
}

button,
input {
    font: inherit;
}

/* 背景の陰影 */

.page-overlay {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;

    background:
        radial-gradient(circle at center,
            transparent 20%,
            rgba(0, 0, 0, 0.54) 100%);
}

/* ヘッダー */

.members-header {
    position: relative;
    z-index: 1;

    display: flex;
    justify-content: center;

    padding: 24px 20px 10px;
}

.brand-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    padding: 10px 18px;

    border: 1px solid rgba(200, 169, 106, 0.72);
    border-radius: 4px;

    background:
        linear-gradient(145deg,
            rgba(8, 32, 23, 0.96),
            rgba(3, 16, 11, 0.98));
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.24);

    transition:
        transform 0.2s ease,
        border-color 0.2s ease;
}

.brand-link:hover {
    transform: translateY(-2px);
    border-color: var(--gold);
}

.brand-logo {
    display: block;
    width: min(340px, 72vw);
    max-height: 92px;
    object-fit: contain;
}

/* ログイン領域 */

.login-main {
    position: relative;
    z-index: 1;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 30px 20px 50px;
}

.login-card {
    width: min(100%, 500px);
    padding: 44px 46px 40px;

    text-align: center;

    border: 1px solid rgba(200, 169, 106, 0.65);
    border-radius: 6px;

    background:
        linear-gradient(145deg,
            rgba(10, 31, 23, 0.96),
            rgba(5, 18, 13, 0.97));

    box-shadow:
        0 28px 70px rgba(0, 0, 0, 0.5),
        inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.login-label {
    margin: 0 0 14px;

    color: var(--gold-light);
    font-size: 0.74rem;
    letter-spacing: 0.3em;
}

.login-card h1 {
    margin: 0;

    color: var(--white);
    font-size: clamp(2rem, 6vw, 3.2rem);
    font-weight: 400;
    letter-spacing: 0.06em;
    line-height: 1.1;
}

.login-card h1::after {
    content: "";
    display: block;

    width: 72px;
    height: 1px;
    margin: 22px auto 20px;

    background: linear-gradient(90deg,
            transparent,
            var(--gold),
            transparent);
}

.login-lead {
    margin: 0 0 30px;

    color: rgba(245, 241, 231, 0.82);
    font-size: 0.98rem;
    line-height: 1.9;
}

/* フォーム */

.login-form {
    display: grid;
    gap: 20px;

    text-align: left;
}

.form-group {
    display: grid;
    gap: 8px;
}

.form-group label {
    color: var(--gold-light);
    font-size: 0.88rem;
    letter-spacing: 0.06em;
}

.form-group input {
    width: 100%;
    min-height: 50px;
    padding: 12px 14px;

    color: var(--white);

    border: 1px solid rgba(228, 207, 157, 0.42);
    border-radius: 3px;
    outline: none;

    background: rgba(255, 255, 255, 0.07);

    transition:
        border-color 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease;
}

.form-group input:focus {
    border-color: var(--gold);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 3px rgba(200, 169, 106, 0.14);
}

.login-button {
    min-height: 52px;
    margin-top: 5px;

    color: var(--forest-dark);
    font-weight: 700;
    letter-spacing: 0.12em;

    cursor: pointer;

    border: 1px solid var(--gold-light);
    border-radius: 3px;

    background: linear-gradient(135deg,
            var(--gold-light),
            var(--gold));

    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);

    transition:
        transform 0.2s ease,
        filter 0.2s ease;
}

.login-button:hover {
    transform: translateY(-2px);
    filter: brightness(1.07);
}

.login-button:active {
    transform: translateY(0);
}

.login-message {
    min-height: 1.5em;
    margin: 0;

    color: var(--error);
    font-size: 0.88rem;
    text-align: center;
}

/* 補足・戻るリンク */

.member-note {
    margin: 24px 0 18px;
    padding-top: 22px;

    color: rgba(245, 241, 231, 0.66);
    font-size: 0.82rem;
    line-height: 1.8;

    border-top: 1px solid rgba(200, 169, 106, 0.2);
}

.back-link {
    display: inline-block;

    color: var(--gold-light);
    font-size: 0.86rem;
    text-decoration: none;
    letter-spacing: 0.04em;
}

.back-link:hover {
    text-decoration: underline;
}

/* フッター */

.members-footer {
    position: relative;
    z-index: 1;

    padding: 16px 20px 22px;

    color: rgba(245, 241, 231, 0.52);
    font-size: 0.76rem;
    text-align: center;
    letter-spacing: 0.08em;
}

.members-footer p {
    margin: 0;
}

/* スマートフォン */

@media (max-width: 600px) {

    body {
        background-attachment: scroll;
    }

    .members-header {
        padding-top: 16px;
    }

    .brand-link {
        padding: 8px 14px;
    }

    .brand-logo {
        width: min(280px, 76vw);
        max-height: 76px;
    }

    .login-main {
        align-items: flex-start;
        padding: 20px 14px 36px;
    }

    .login-card {
        padding: 34px 22px 30px;
    }

    .login-label {
        font-size: 0.66rem;
        letter-spacing: 0.22em;
    }

    .login-card h1 {
        font-size: 2rem;
    }
}