:root {
    --login-bg: radial-gradient(circle at 20% -10%, rgba(115, 155, 255, 0.35), transparent 55%),
        radial-gradient(circle at 82% 12%, rgba(26, 209, 185, 0.32), transparent 48%),
        linear-gradient(160deg, rgba(7, 15, 52, 0.98), rgba(3, 9, 30, 0.98));
    --login-card-bg: linear-gradient(150deg, rgba(15, 30, 72, 0.95), rgba(8, 20, 60, 0.92));
    --login-border: rgba(113, 164, 255, 0.35);
    --login-shadow: 0 32px 64px rgba(5, 10, 35, 0.55);
    --login-shadow-soft: 0 18px 38px rgba(4, 9, 28, 0.45);
}

.login-body {
    margin: 0;
    min-height: 100vh;
    font-family: "Noto Sans JP", "Segoe UI", "Helvetica Neue", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--color-text, #f9fdff);
    background: var(--login-bg), #030a21;
    display: flex;
    align-items: stretch;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
}

.modal-open {
    overflow: hidden;
}

.login-body::before,
.login-body::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.login-body::before {
    background: radial-gradient(circle at 12% 85%, rgba(40, 110, 255, 0.2), transparent 55%);
    filter: blur(0);
}

.login-body::after {
    background: radial-gradient(circle at 88% 82%, rgba(31, 196, 169, 0.24), transparent 58%);
}

.login-shell {
    width: min(1080px, 94vw);
    margin: clamp(32px, 6vw, 64px) auto;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: clamp(24px, 4vw, 40px);
    position: relative;
    z-index: 1;
}

.login-hero {
    grid-column: span 6;
    align-self: center;
    display: flex;
    flex-direction: column;
    gap: clamp(16px, 2.5vw, 28px);
}

.login-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(98, 164, 255, 0.18);
    border: 1px solid rgba(162, 204, 255, 0.32);
    color: rgba(215, 230, 255, 0.95);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    width: fit-content;
    box-shadow: var(--login-shadow-soft);
}

.login-title {
    margin: 0;
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.02em;
}

.login-copy {
    margin: 0;
    color: rgba(215, 228, 255, 0.78);
    font-size: clamp(1rem, 2vw, 1.08rem);
    line-height: 1.75;
}

.login-card {
    grid-column: span 6;
    padding: clamp(28px, 4vw, 36px);
    border-radius: 28px;
    background: var(--login-card-bg);
    border: 1px solid var(--login-border);
    box-shadow: var(--login-shadow);
    backdrop-filter: blur(18px);
    display: flex;
    flex-direction: column;
    gap: clamp(20px, 4vw, 28px);
    --form-control-radius: 14px;
    --form-control-border: rgba(146, 188, 255, 0.35);
    --form-control-bg: rgba(7, 16, 48, 0.68);
    --form-control-color: #f4f8ff;
    --form-control-placeholder: rgba(186, 206, 255, 0.58);
    --form-control-focus-border: rgba(176, 220, 255, 0.7);
    --form-control-focus-bg: rgba(9, 20, 56, 0.78);
    --form-control-focus-color: #f4f8ff;
    --form-control-focus-shadow: 0 0 0 4px rgba(86, 146, 255, 0.25);
}

.login-card__header {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.login-card__title {
    margin: 0;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.login-card__caption {
    margin: 0;
    color: rgba(209, 223, 255, 0.7);
    font-size: 0.95rem;
    line-height: 1.6;
}

.login-card .form-field label,
.modal__dialog .form-field label {
    color: rgba(218, 231, 255, 0.85);
}

.notice {
    padding: 14px 16px;
    border-radius: 16px;
    font-size: 0.92rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid transparent;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.notice[hidden] {
    display: none;
}

.notice--error {
    background: linear-gradient(140deg, rgba(255, 109, 132, 0.18), rgba(255, 73, 73, 0.15));
    border-color: rgba(255, 119, 141, 0.4);
    color: #ffe6ec;
}

.notice--success {
    background: linear-gradient(140deg, rgba(94, 214, 164, 0.2), rgba(58, 186, 142, 0.16));
    border-color: rgba(115, 232, 188, 0.4);
    color: #e5fff3;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.input-wrapper {
    position: relative;
}

.form-remember {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: rgba(211, 225, 255, 0.78);
}

.form-remember input {
    width: 18px;
    height: 18px;
    border-radius: 6px;
    border: 1px solid rgba(145, 189, 255, 0.5);
    accent-color: #5fa8ff;
}

.login-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.92rem;
}

.link-list a {
    color: rgba(147, 199, 255, 0.92);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s var(--transition-base, ease), transform 0.2s var(--transition-base, ease);
}

.link-list a:hover,
.link-list a:focus-visible {
    color: rgba(26, 209, 185, 0.95);
    transform: translateX(2px);
}

.info-card {
    grid-column: span 12;
    margin-top: clamp(20px, 4vw, 28px);
    padding: clamp(22px, 4vw, 32px);
    border-radius: 24px;
    background: rgba(10, 26, 62, 0.75);
    border: 1px solid rgba(120, 170, 255, 0.28);
    box-shadow: var(--login-shadow-soft);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: clamp(18px, 3vw, 28px);
}

.info-card__section > h3 {
    margin: 0 0 12px;
    font-size: 1.05rem;
    color: rgba(214, 228, 255, 0.92);
}

.info-card__section p {
    margin: 0;
    color: rgba(198, 214, 255, 0.75);
    line-height: 1.7;
    font-size: 0.92rem;
}

.info-card__section strong {
    color: rgba(245, 248, 255, 0.92);
}

.modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal[open] {
    display: flex;
}

.modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(4, 12, 33, 0.65);
    backdrop-filter: blur(6px);
}

.modal__dialog {
    position: relative;
    z-index: 1;
    width: min(420px, 92vw);
    padding: 28px;
    border-radius: 22px;
    background: linear-gradient(150deg, rgba(16, 34, 84, 0.96), rgba(8, 20, 52, 0.94));
    border: 1px solid rgba(138, 186, 255, 0.35);
    box-shadow: 0 30px 60px rgba(3, 12, 36, 0.55);
    display: flex;
    flex-direction: column;
    gap: 18px;
    --form-control-radius: 14px;
    --form-control-border: rgba(146, 188, 255, 0.35);
    --form-control-bg: rgba(7, 16, 48, 0.68);
    --form-control-color: #f4f8ff;
    --form-control-placeholder: rgba(186, 206, 255, 0.58);
    --form-control-focus-border: rgba(176, 220, 255, 0.7);
    --form-control-focus-bg: rgba(9, 20, 56, 0.78);
    --form-control-focus-color: #f4f8ff;
    --form-control-focus-shadow: 0 0 0 4px rgba(86, 146, 255, 0.25);
}

.modal__close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: rgba(220, 232, 255, 0.7);
    font-size: 1.2rem;
    cursor: pointer;
}

.modal__title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.modal__body {
    margin: 0;
    color: rgba(205, 220, 255, 0.78);
    line-height: 1.6;
}

.modal__step {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.modal__actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.modal__step[hidden] {
    display: none;
}

.sublink {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    color: rgba(174, 208, 255, 0.82);
    font-size: 0.9rem;
    text-decoration: none;
}

.sublink:hover,
.sublink:focus-visible {
    color: rgba(26, 209, 185, 0.95);
}

@media (max-width: 960px) {
    .login-shell {
        grid-template-columns: repeat(6, 1fr);
    }

    .login-hero {
        grid-column: 1 / -1;
        text-align: center;
        align-items: center;
    }

    .login-card {
        grid-column: span 6;
    }

    .info-card {
        grid-column: span 6;
    }
}

@media (max-width: 640px) {
    .login-shell {
        margin: clamp(24px, 8vw, 40px) auto;
    }

    .login-card {
        padding: 24px;
        border-radius: 22px;
    }

    .btn {
        width: 100%;
    }

    .modal__dialog {
        padding: 24px;
    }
}