:root {
    --spss-nav-ink: #172033;
    --spss-nav-muted: #697386;
    --spss-nav-line: #e7eaf0;
    --spss-nav-accent: #3448c5;
    --spss-nav-soft: #eef1ff;
}

.spss-nav {
    position: relative;
    z-index: 1040;
    width: 100%;
    border-bottom: 1px solid var(--spss-nav-line);
    background:
        radial-gradient(circle at 8% -50%, rgba(52, 72, 197, 0.12), transparent 30%),
        rgba(255, 255, 255, 0.96);
    box-shadow: 0 6px 24px rgba(23, 32, 51, 0.04);
    backdrop-filter: blur(14px);
}

.spss-nav__inner {
    min-height: 72px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(20px, 3vw, 48px);
}

.spss-nav__brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--spss-nav-ink);
    text-decoration: none;
    white-space: nowrap;
}

.spss-nav__brand img {
    display: block;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    box-shadow: 0 5px 14px rgba(52, 72, 197, 0.18);
}

.spss-nav__brand span,
.spss-nav__brand strong,
.spss-nav__brand small {
    display: block;
}

.spss-nav__brand strong {
    font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
    font-size: 1.04rem;
    letter-spacing: 0.02em;
}

.spss-nav__brand small {
    margin-top: 2px;
    color: var(--spss-nav-muted);
    font-size: 0.72rem;
    font-weight: 600;
}

.spss-nav__links {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 4px;
    min-width: 0;
}

.spss-nav__links a {
    position: relative;
    padding: 10px 13px;
    border-radius: 10px;
    color: #3d4658;
    font-size: 0.92rem;
    font-weight: 650;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

.spss-nav__links a:hover,
.spss-nav__links a.active {
    color: var(--spss-nav-accent);
    background: var(--spss-nav-soft);
}

.spss-nav__links a:hover {
    transform: translateY(-1px);
}

.spss-nav__account {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    min-width: 0;
}

.spss-nav__login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 20px;
    border: 1px solid var(--spss-nav-accent);
    border-radius: 12px;
    background: var(--spss-nav-accent);
    color: #fff;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 8px 20px rgba(52, 72, 197, 0.18);
}

.spss-user-menu {
    position: relative;
}

.spss-user-menu > summary {
    display: flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    padding: 5px 9px 5px 6px;
    border: 1px solid #dfe3ec;
    border-radius: 14px;
    background: #fff;
    color: var(--spss-nav-ink);
    cursor: pointer;
    list-style: none;
    box-shadow: 0 4px 16px rgba(23, 32, 51, 0.06);
}

.spss-user-menu > summary::-webkit-details-marker {
    display: none;
}

.spss-user-menu > summary img {
    width: 36px;
    height: 36px;
    flex: 0 0 36px;
    border-radius: 11px;
    object-fit: cover;
    background: var(--spss-nav-soft);
}

.spss-user-menu__identity {
    min-width: 0;
    max-width: 130px;
}

.spss-user-menu__identity strong,
.spss-user-menu__identity small {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.spss-user-menu__identity strong {
    font-size: 0.84rem;
}

.spss-user-menu__identity small {
    margin-top: 2px;
    color: var(--spss-nav-accent);
    font-size: 0.72rem;
    font-weight: 700;
}

.spss-user-menu__chevron {
    color: var(--spss-nav-muted);
    transition: transform 160ms ease;
}

.spss-user-menu[open] .spss-user-menu__chevron {
    transform: rotate(180deg);
}

.spss-user-menu__panel {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 190px;
    max-width: calc(100vw - 24px);
    padding: 8px;
    border: 1px solid var(--spss-nav-line);
    border-radius: 15px;
    background: #fff;
    box-shadow: 0 18px 45px rgba(23, 32, 51, 0.16);
}

.spss-user-menu__panel a {
    display: block;
    padding: 10px 12px;
    border-radius: 9px;
    color: #30394b;
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
}

.spss-user-menu__panel a:hover {
    background: var(--spss-nav-soft);
    color: var(--spss-nav-accent);
}

.spss-user-menu__action {
    display: block;
    width: 100%;
    padding: 10px 12px;
    border: 0;
    border-radius: 9px;
    background: transparent;
    color: #30394b;
    font: inherit;
    font-size: 0.88rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
}

.spss-user-menu__action:hover,
.spss-user-menu__action:focus-visible {
    background: var(--spss-nav-soft);
    color: var(--spss-nav-accent);
    outline: none;
}

.spss-user-menu__action:disabled {
    cursor: wait;
    opacity: 0.62;
}

.spss-user-menu__feedback {
    display: block;
    min-height: 1.15em;
    margin: 1px 12px 3px;
    color: #687386;
    font-size: 0.72rem;
    line-height: 1.35;
}

.spss-user-menu__feedback.is-success {
    color: #087443;
}

.spss-user-menu__feedback.is-error {
    color: #b42318;
}

.spss-user-menu__balance {
    margin: 2px 4px 7px;
    padding: 10px 8px;
    border-bottom: 1px solid var(--spss-nav-line);
    color: var(--spss-nav-muted);
    font-size: 0.76rem;
}

.spss-user-menu__balance strong {
    display: block;
    margin-top: 3px;
    color: var(--spss-nav-accent);
    font-size: 0.92rem;
}

.spss-user-menu__panel .spss-user-menu__logout {
    margin-top: 5px;
    border-top: 1px solid var(--spss-nav-line);
    border-radius: 0 0 9px 9px;
    color: #b42318;
}

.spss-nav__toggle {
    display: none;
    width: 42px;
    height: 42px;
    padding: 10px;
    border: 1px solid var(--spss-nav-line);
    border-radius: 12px;
    background: #fff;
}

.spss-nav__toggle > span:not(.visually-hidden) {
    display: block;
    width: 100%;
    height: 2px;
    margin: 4px 0;
    border-radius: 2px;
    background: var(--spss-nav-ink);
}

@media (max-width: 991.98px) {
    .spss-nav__inner {
        min-height: 66px;
        grid-template-columns: auto 1fr;
        gap: 16px;
    }

    .spss-nav__account {
        justify-self: end;
    }

    .spss-nav__toggle {
        display: block;
    }

    .spss-nav__links {
        display: none;
        grid-column: 1 / -1;
        grid-row: 2;
        padding: 8px 0 16px;
        border-top: 1px solid var(--spss-nav-line);
        flex-direction: column;
        align-items: stretch;
    }

    .spss-nav.is-open .spss-nav__links {
        display: flex;
        animation: spss-nav-reveal 160ms ease both;
    }

    .spss-nav__links a {
        padding: 12px 14px;
    }
}

@media (max-width: 575.98px) {
    .spss-nav__inner {
        min-height: 62px;
        grid-template-columns: minmax(0, 1fr) auto;
        gap: 8px;
    }

    .spss-nav__brand img {
        width: 36px;
        height: 36px;
    }

    .spss-nav__brand {
        min-width: 0;
        gap: 8px;
    }

    .spss-nav__brand strong {
        overflow: hidden;
        max-width: 84px;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .spss-nav__account {
        gap: 6px;
    }

    .spss-nav__brand small,
    .spss-user-menu__identity,
    .spss-user-menu__chevron {
        display: none;
    }

    .spss-user-menu > summary {
        padding: 3px;
        border-radius: 12px;
    }

    .spss-user-menu > summary img {
        width: 34px;
        height: 34px;
        flex-basis: 34px;
    }

    .spss-user-menu__panel {
        right: 0;
    }

    .spss-nav__login {
        min-height: 38px;
        padding: 0 14px;
    }

    .spss-nav__toggle {
        width: 38px;
        height: 38px;
        padding: 8px;
    }
}

@keyframes spss-nav-reveal {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

[data-theme="dark"] .spss-nav,
[data-theme="dark"] .spss-user-menu > summary,
[data-theme="dark"] .spss-user-menu__panel,
[data-theme="dark"] .spss-nav__toggle {
    background: #161a24;
    border-color: #2c3342;
}

[data-theme="dark"] .spss-nav__brand,
[data-theme="dark"] .spss-user-menu > summary,
[data-theme="dark"] .spss-nav__links a,
[data-theme="dark"] .spss-user-menu__panel a {
    color: #edf0f7;
}