:root {
    --ib-color-navy: #1a2b3c;
    --ib-color-navy-light: #243e54;
    --ib-color-gold: #c5a059;
    --ib-color-gold-muted: #d4bc7f;
    --ib-color-cream: #fdf9f3;
    --ib-color-white: #ffffff;
    --ib-color-text: #3d4a5c;
    --ib-color-text-muted: #6b7c8f;
    --ib-color-border: rgba(26, 43, 60, 0.08);
    --ib-shadow-sm: 0 2px 8px rgba(26, 43, 60, 0.06);
    --ib-shadow-md: 0 8px 24px rgba(26, 43, 60, 0.08);
    --ib-radius: 12px;
    --ib-radius-pill: 999px;
    --ib-font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --ib-layout-max-width: 1440px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--ib-font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--ib-color-text);
    background-color: var(--ib-color-cream);
}

.ib-main {
    min-height: 50vh;
}

/* 错误页（404 等） */
.ib-page-error {
    padding-block: clamp(3rem, 8vw, 5rem) clamp(4rem, 10vw, 6rem);
    text-align: center;
}

.ib-page-error .ib-container {
    max-width: 36rem;
}

.ib-page-error__code {
    font-family: var(--ib-font-sans);
    font-size: clamp(3.5rem, 14vw, 5.5rem);
    font-weight: 700;
    line-height: 1;
    margin: 0 0 1rem;
    color: var(--ib-color-navy);
    letter-spacing: 0.04em;
    opacity: 0.88;
}

.ib-page-error__title {
    font-family: var(--ib-font-sans);
    font-size: clamp(1.2rem, 2.5vw, 1.45rem);
    font-weight: 700;
    color: var(--ib-color-navy);
    margin: 0 0 0.75rem;
}

.ib-page-error__lead {
    margin: 0 auto 2rem;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--ib-color-text-muted);
}

.ib-page-error__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
}

.ib-page-error__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1.35rem;
    border-radius: var(--ib-radius-pill);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
}

.ib-page-error__btn--primary {
    background: var(--ib-color-navy);
    color: var(--ib-color-white);
    border: 1px solid var(--ib-color-navy);
}

.ib-page-error__btn--primary:hover {
    background: var(--ib-color-navy-light);
    border-color: var(--ib-color-navy-light);
    color: var(--ib-color-white);
    transform: translateY(-1px);
}

.ib-page-error__btn--outline {
    background: var(--ib-color-white);
    color: var(--ib-color-navy);
    border: 1px solid var(--ib-color-border);
    box-shadow: var(--ib-shadow-sm);
}

.ib-page-error__btn--outline:hover {
    border-color: var(--ib-color-gold);
    color: var(--ib-color-gold);
}

.ib-container {
    width: 100%;
    max-width: var(--ib-layout-max-width);
    margin-inline: auto;
}

.ib-section-title {
    font-family: var(--ib-font-sans);
    font-size: clamp(1.35rem, 2.5vw, 1.75rem);
    font-weight: 700;
    color: var(--ib-color-navy);
    margin: 0 0 0.35rem;
    letter-spacing: 0.02em;
}

.ib-section-subtitle {
    font-size: 0.9rem;
    color: var(--ib-color-gold);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin: 0 0 1.75rem;
}

.ib-card {
    background: var(--ib-color-white);
    border-radius: var(--ib-radius);
    box-shadow: var(--ib-shadow-sm);
    border: 1px solid var(--ib-color-border);
}

.ib-accent-line {
    display: block;
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--ib-color-gold), var(--ib-color-gold-muted));
    border-radius: 2px;
    margin-bottom: 1.25rem;
}

.ib-page-hero {
    background: var(--ib-color-cream);
    padding-block: 3rem 2.5rem;
    border-bottom: 1px solid var(--ib-color-border);
}

.ib-page-hero__title {
    font-family: var(--ib-font-sans);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    color: var(--ib-color-navy);
    margin: 0 0 1rem;
    letter-spacing: 0.02em;
}

.ib-page-hero__lead {
    margin: 0;
    max-width: 52rem;
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--ib-color-text-muted);
}

/* 面包屑（全站公共） */
.ib-crumb {
    font-size: 0.85rem;
    margin: 0 0 0.75rem;
    color: var(--ib-color-text-muted);
}

.ib-crumb__link {
    color: var(--ib-color-navy);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.ib-crumb__link:hover,
.ib-crumb__link:focus-visible {
    color: var(--ib-color-gold);
    border-bottom-color: var(--ib-color-gold);
}

.ib-crumb__sep {
    margin: 0 0.35rem;
    opacity: 0.55;
}

.ib-crumb__current {
    font-weight: 600;
    color: var(--ib-color-navy);
}

.ib-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: var(--ib-color-white);
    box-shadow: var(--ib-shadow-sm);
}

.ib-header .ib-header__bar {
    border-bottom: 1px solid var(--ib-color-border);
}

.ib-header .ib-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 0.75rem;
}

.ib-header .ib-header__brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--ib-color-navy);
    flex-shrink: 0;
    min-width: 0;
}

@media (max-width: 991.98px) {
    .ib-header .ib-header__brand {
        flex: 1 1 auto;
        min-width: 0;
    }
}

.ib-header .ib-header__brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ib-header .ib-header__brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ib-header .ib-header__brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.25;
}

.ib-header .ib-header__brand-text-cn {
    font-family: var(--ib-font-sans);
    font-weight: 700;
    font-size: 1rem;
}

.ib-header .ib-header__brand-text-en {
    font-size: 0.7rem;
    color: var(--ib-color-text-muted);
    letter-spacing: 0.02em;
}

.ib-header .ib-header__nav {
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.25rem 2.5rem;
}

.ib-header .ib-header__nav-link {
    color: var(--ib-color-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.35rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.ib-header .ib-header__nav-link:hover,
.ib-header .ib-header__nav-link.is-active {
    color: var(--ib-color-navy);
    border-bottom-color: var(--ib-color-gold);
}

.ib-header .ib-header__actions {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0.5rem 0.5rem;
    justify-content: flex-end;
    flex-shrink: 0;
    min-width: 0;
}

.ib-header__lang {
    display: inline-flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.15rem 0.3rem;
    font-size: 0.78rem;
    line-height: 1.2;
    color: var(--ib-color-text-muted);
    white-space: nowrap;
}

@media (min-width: 576px) {
    .ib-header__lang {
        font-size: 0.85rem;
        gap: 0.2rem 0.4rem;
    }
}

.ib-header__lang button {
    background: none;
    border: none;
    padding: 0 0.15rem;
    cursor: pointer;
    color: inherit;
    font: inherit;
    white-space: nowrap;
    flex-shrink: 0;
}

.ib-header__lang .ib-header__lang-current {
    color: var(--ib-color-navy);
    font-weight: 600;
    padding: 0 0.15rem;
    flex-shrink: 0;
}

.ib-header__lang button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.ib-header__lang--panel {
    flex-wrap: wrap;
    white-space: normal;
    row-gap: 0.35rem;
    font-size: 0.9rem;
    padding: 0.5rem 0.65rem;
    border-radius: var(--ib-radius);
    background: rgba(26, 43, 60, 0.04);
    border: 1px solid var(--ib-color-border);
}

.ib-offcanvas-nav__lang {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--ib-color-border);
}

.ib-offcanvas-nav__lang-label {
    margin: 0 0 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ib-color-text-muted);
}

.ib-header .ib-header__menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: 1px solid var(--ib-color-border);
    border-radius: var(--ib-radius);
    background: var(--ib-color-white);
    color: var(--ib-color-navy);
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.ib-header .ib-header__menu-btn:hover {
    border-color: var(--ib-color-gold);
    color: var(--ib-color-gold);
}

.ib-header .ib-header__menu-btn:focus-visible {
    outline: 2px solid var(--ib-color-gold);
    outline-offset: 2px;
}

.ib-offcanvas-nav .offcanvas-header {
    background: var(--ib-color-cream);
}

.ib-offcanvas-nav .offcanvas-title {
    color: var(--ib-color-navy);
    font-weight: 700;
}

.ib-offcanvas-nav__list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.ib-offcanvas-nav__link {
    display: block;
    padding: 0.65rem 0.75rem;
    border-radius: var(--ib-radius);
    color: var(--ib-color-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.ib-offcanvas-nav__link:hover,
.ib-offcanvas-nav__link:focus-visible {
    background: rgba(26, 43, 60, 0.06);
    color: var(--ib-color-navy);
}

.ib-offcanvas-nav__link.is-active {
    color: var(--ib-color-navy);
    font-weight: 600;
    background: rgba(197, 160, 89, 0.12);
    border-left-color: var(--ib-color-gold);
}

.ib-header .ib-header__auth {
    font-size: 0.85rem;
}

.ib-header .ib-header__auth a {
    color: var(--ib-color-text-muted);
    text-decoration: none;
}

.ib-header .ib-header__auth a:hover {
    color: var(--ib-color-navy);
}

.ib-header .ib-header__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.25rem;
    border-radius: var(--ib-radius-pill);
    background: var(--ib-color-navy);
    color: var(--ib-color-white);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
    white-space: nowrap;
}

.ib-header .ib-header__cta:hover {
    background: var(--ib-color-navy-light);
    color: var(--ib-color-white);
    transform: translateY(-1px);
}

.ib-footer {
    background: var(--ib-color-navy);
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.9rem;
    margin-top: 3rem;
}

.ib-footer .ib-footer__main {
    padding-block: 3rem 2rem;
}

.ib-footer .ib-footer__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

@media (max-width: 991.98px) {
    .ib-footer .ib-footer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 575.98px) {
    .ib-footer .ib-footer__grid {
        grid-template-columns: 1fr;
    }
}

.ib-footer .ib-footer__col-title {
    font-family: var(--ib-font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--ib-color-white);
    margin: 0 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--ib-color-gold);
    display: inline-block;
}

.ib-footer .ib-footer__links {
    list-style: none;
    margin: 0;
    padding: 0;
}

.ib-footer .ib-footer__links li {
    margin-bottom: 0.5rem;
}

.ib-footer .ib-footer__links a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: color 0.2s;
}

.ib-footer .ib-footer__links a:hover {
    color: var(--ib-color-gold-muted);
}

.ib-footer .ib-footer__friends {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.ib-footer .ib-footer__friends .ib-footer__col-title {
    margin-bottom: 1rem;
}

.ib-footer .ib-footer__friends-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.5rem;
    align-items: center;
}

.ib-footer .ib-footer__friends-list a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.88rem;
}

.ib-footer .ib-footer__friends-list a:hover {
    color: var(--ib-color-gold-muted);
}

.ib-footer .ib-footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-block: 1.25rem;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
}

.ib-footer .ib-footer__bottom .ib-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.ib-footer .ib-footer__bottom .ib-container p {
    margin: 0;
}

.ib-footer .ib-footer__social {
    display: flex;
    gap: 0.75rem;
}

.ib-footer .ib-footer__social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--ib-color-white);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}

.ib-footer .ib-footer__social a:hover {
    background: var(--ib-color-gold);
    color: var(--ib-color-navy);
}

/* Pagination (shared component) */
.ib-pagination {
    margin-top: 1.5rem;
}

.ib-pagination .ib-pagination__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem 0.75rem;
}

.ib-pagination .ib-pagination__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.5rem;
    padding: 0 1rem;
    font-family: var(--ib-font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ib-color-navy);
    text-decoration: none;
    background: var(--ib-color-white);
    border: 1px solid var(--ib-color-border);
    border-radius: var(--ib-radius-pill);
    box-shadow: var(--ib-shadow-sm);
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.ib-pagination .ib-pagination__btn:hover:not(.ib-pagination__btn--disabled) {
    color: var(--ib-color-gold);
    border-color: var(--ib-color-gold);
}

.ib-pagination .ib-pagination__btn:focus-visible {
    outline: 2px solid var(--ib-color-gold);
    outline-offset: 2px;
}

.ib-pagination .ib-pagination__btn--disabled {
    color: var(--ib-color-text-muted);
    background: rgba(255, 255, 255, 0.6);
    cursor: not-allowed;
    box-shadow: none;
}

.ib-pagination .ib-pagination__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.ib-pagination .ib-pagination__num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    min-height: 2.5rem;
    padding: 0 0.35rem;
    font-family: var(--ib-font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ib-color-navy);
    text-decoration: none;
    background: var(--ib-color-white);
    border: 1px solid var(--ib-color-border);
    border-radius: var(--ib-radius);
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.ib-pagination .ib-pagination__num:hover:not(.is-active) {
    border-color: var(--ib-color-gold);
    color: var(--ib-color-gold);
}

.ib-pagination .ib-pagination__num:focus-visible {
    outline: 2px solid var(--ib-color-gold);
    outline-offset: 2px;
}

.ib-pagination .ib-pagination__num.is-active {
    background: var(--ib-color-navy);
    border-color: var(--ib-color-navy);
    color: var(--ib-color-white);
    cursor: default;
}

.ib-pagination .ib-pagination__current-mobile {
    display: none;
    min-height: 2.5rem;
    padding: 0 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ib-color-text-muted);
    white-space: nowrap;
}

@media (max-width: 575.98px) {
    .ib-pagination .ib-pagination__list {
        display: none;
    }

    .ib-pagination .ib-pagination__current-mobile {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
}

/* Empty state (shared component) */
.ib-no-data {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2.25rem 1rem;
    background: var(--ib-color-white);
    border: 1px solid var(--ib-color-border);
    border-radius: var(--ib-radius);
    box-shadow: var(--ib-shadow-sm);
}

.ib-no-data__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    color: var(--ib-color-gold);
    background: rgba(197, 160, 89, 0.14);
    font-size: 1.3rem;
    margin-bottom: 0.9rem;
}

.ib-no-data__title {
    margin: 0;
    font-size: 1.06rem;
    font-weight: 700;
    color: var(--ib-color-navy);
}

.ib-no-data__hint {
    margin: 0.55rem 0 0;
    font-size: 0.93rem;
    line-height: 1.65;
    color: var(--ib-color-text-muted);
}