:root {
    --obt-blue-50: #eff6ff;
    --obt-blue-100: #dbeafe;
    --obt-blue-500: #3b82f6;
    --obt-blue-600: #2563eb;
    --obt-blue-700: #1d4ed8;
    --obt-blue-800: #1e40af;
    --obt-ink: #0f172a;
    --obt-muted: #64748b;
    --obt-border: #e2e8f0;
    --obt-card: #ffffff;
    --obt-shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

.obt-auth-body {
    margin: 0;
    min-height: 100vh;
    font-family: "Plus Jakarta Sans", system-ui, sans-serif;
    color: var(--obt-ink);
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 34%),
        radial-gradient(circle at bottom right, rgba(59, 130, 246, 0.12), transparent 30%),
        linear-gradient(180deg, #f8fbff 0%, #eef4ff 48%, #f7fafc 100%);
}

.obt-auth-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.obt-auth-brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 1.5rem;
}

.obt-logo-mark {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 700;
    font-size: 1.25rem;
    background: linear-gradient(145deg, var(--obt-blue-500), var(--obt-blue-700));
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
}

.obt-brand-name {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.obt-brand-tag {
    color: var(--obt-muted);
    font-size: 0.82rem;
}

.obt-auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--obt-card);
    border: 1px solid rgba(226, 232, 240, 0.9);
    border-radius: 22px;
    padding: 2rem;
    box-shadow: var(--obt-shadow);
}

.obt-card-header {
    margin-bottom: 1.5rem;
}

.obt-title {
    margin: 0;
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.obt-subtitle {
    margin: 0.4rem 0 0;
    color: var(--obt-muted);
    font-size: 0.95rem;
}

.obt-input {
    border-radius: 12px;
    border-color: var(--obt-border);
    padding: 0.75rem 0.95rem;
    min-height: 48px;
}

.obt-input:focus {
    border-color: var(--obt-blue-500);
    box-shadow: 0 0 0 0.25rem rgba(37, 99, 235, 0.15);
}

.obt-password-wrap {
    position: relative;
}

.obt-password-wrap .obt-input {
    padding-right: 3rem;
}

.obt-password-toggle {
    position: absolute;
    top: 50%;
    right: 0.7rem;
    transform: translateY(-50%);
    border: 0;
    background: transparent;
    color: var(--obt-muted);
    padding: 0.25rem;
    line-height: 1;
}

.obt-password-toggle:hover {
    color: var(--obt-blue-700);
}

.obt-btn-primary {
    border: 0;
    border-radius: 12px;
    min-height: 48px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--obt-blue-600), var(--obt-blue-700));
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.25);
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.obt-btn-primary:hover,
.obt-btn-primary:focus {
    color: #fff;
    background: linear-gradient(135deg, var(--obt-blue-700), var(--obt-blue-800));
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(37, 99, 235, 0.3);
}

.obt-btn-secondary {
    border-radius: 12px;
    min-height: 48px;
    font-weight: 600;
    color: var(--obt-blue-700);
    background: var(--obt-blue-50);
    border: 1px solid var(--obt-blue-100);
}

.obt-btn-secondary:hover {
    color: var(--obt-blue-800);
    background: var(--obt-blue-100);
}

.obt-link {
    color: var(--obt-blue-700);
    text-decoration: none;
    font-weight: 500;
}

.obt-link:hover {
    color: var(--obt-blue-800);
    text-decoration: underline;
}

.obt-alert {
    border: 0;
    border-radius: 12px;
    font-size: 0.92rem;
}

.obt-auth-footer {
    margin-top: 1.5rem;
    color: var(--obt-muted);
    font-size: 0.85rem;
}

.obt-session-box {
    border: 1px solid var(--obt-border);
    border-radius: 16px;
    overflow: hidden;
    background: #fbfdff;
}

.obt-session-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--obt-border);
    font-size: 0.92rem;
}

.obt-session-row:last-child {
    border-bottom: 0;
}

.obt-session-row span {
    color: var(--obt-muted);
}

.obt-mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.78rem;
    word-break: break-all;
    text-align: right;
}

.motion-fade-in {
    animation: obtFadeIn 0.55s ease both;
}

.motion-rise {
    animation: obtRise 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes obtFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes obtRise {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn.is-loading .btn-label {
    opacity: 0.65;
}

.btn.is-loading .btn-spinner {
    display: inline-block !important;
    margin-left: 0.5rem;
}

@media (max-width: 575.98px) {
    .obt-auth-card {
        padding: 1.5rem;
        border-radius: 18px;
    }

    .obt-title {
        font-size: 1.4rem;
    }
}