/* ========== ログイン画面専用 ========== */
:root {
    --login-bg-base: #f8fafc;
    --login-bg-accent-a: #dbeafe;
    --login-bg-accent-b: #fee2e2;
    --login-card-bg: #ffffff;
    --login-card-border: #cbd5e1;
    --login-title: #0f172a;
    --login-subtext: #64748b;
    --login-divider: #e2e8f0;
    --login-note: #94a3b8;
    --login-btn-start: #1e3a5f;
    --login-btn-end: #2d5a9e;
    --login-btn-hover-start: #162d4a;
    --login-btn-hover-end: #1e3a5f;
}

.login-wrapper {
    min-height: 100vh;
    width: min(920px, 100%);
    margin: 0 auto;
    padding: clamp(28px, 6vw, 84px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-page {
    background:
    radial-gradient(circle at 8% 12%, var(--login-bg-accent-a) 0, var(--login-bg-accent-a) 20%, transparent 55%),
    radial-gradient(circle at 92% 88%, var(--login-bg-accent-b) 0, var(--login-bg-accent-b) 18%, transparent 50%),
    var(--login-bg-base);
}

.login-panel {
    min-width: 0;
    width: 100%;
}

.login-panel-form {
    width: min(100%, 640px);
    margin: 0 auto;
}

.login-card {
    background: var(--login-card-bg);
    border-radius: 16px;
    border: 2px solid var(--login-card-border);
    padding: clamp(28px, 4vw, 44px);
    width: 100%;
    max-width: 640px;
    margin-left: 0;
}

.login-system-header {
    margin: 0 0 30px;
    text-align: center;
}

.login-system-acronym {
    margin: 8px 0 0;
    font-size: 11px;
    line-height: 1.2;
    letter-spacing: 0.08em;
    color: var(--login-subtext);
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    text-transform: uppercase;
}

.login-system-header h1 {
    margin: 0;
    font-size: clamp(24px, 3.2vw, 34px);
    line-height: 1.2;
    letter-spacing: 0.02em;
    color: var(--login-title);
    white-space: nowrap;
    font-family: "Yu Mincho", "Hiragino Mincho ProN", "Times New Roman", serif;
    font-weight: 700;
}

.sso-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 17px 20px;
    background: linear-gradient(135deg, var(--login-btn-start) 0%, var(--login-btn-end) 100%);
    color: var(--login-card-bg);
    border-radius: 10px;
    border: 2px solid var(--login-btn-start);
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-decoration: none;
    transition: background-color 0.15s, transform 0.15s, border-color 0.15s;
}

.sso-btn:hover {
    background: linear-gradient(135deg, var(--login-btn-hover-start) 0%, var(--login-btn-hover-end) 100%);
    border-color: var(--login-btn-hover-start);
    transform: translateY(-1px);
    color: var(--login-card-bg);
    text-decoration: none;
}

.sso-btn svg {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
}

.divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--login-note);
    font-size: 12px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--login-divider);
}

.login-note {
    text-align: center;
    font-size: 12px;
    color: var(--login-note);
    margin: 0;
}

@media (max-width: 960px) {
    .login-wrapper {
        width: 100%;
    }

    .login-system-header h1 {
        white-space: normal;
    }

    .login-card {
        margin-left: 0;
        max-width: none;
    }
}