:root {
    --case-navy: #003153;
    --case-navy-deep: #00233b;
    --case-bronze: #b68f75;
    --case-bronze-deep: #8f6a53;
    --case-ink: #17252f;
    --case-muted: #64727c;
    --case-border: #dce2e5;
    --case-page: #f4f6f7;
    --case-white: #ffffff;
    --case-green: #326b5d;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--case-ink);
    background: var(--case-page);
    font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    letter-spacing: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input {
    font: inherit;
    letter-spacing: 0;
}

img {
    display: block;
    max-width: 100%;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.cases-container {
    width: min(1320px, calc(100% - 64px));
    margin: 0 auto;
}

.cases-header {
    position: sticky;
    z-index: 30;
    top: 0;
    height: 76px;
    color: var(--case-white);
    background: var(--case-navy);
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.cases-header-inner {
    display: flex;
    height: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.cases-brand {
    display: inline-flex;
    min-width: 0;
    align-items: center;
}

.cases-brand img {
    width: min(270px, 35vw);
    max-height: 52px;
    object-fit: contain;
    object-position: left center;
}

.cases-top-nav {
    display: flex;
    height: 100%;
    align-items: stretch;
}

.cases-top-nav a {
    position: relative;
    display: inline-flex;
    min-width: 96px;
    align-items: center;
    justify-content: center;
    padding: 0 18px;
    color: rgba(255, 255, 255, 0.78);
    font-size: 14px;
    font-weight: 600;
}

.cases-top-nav a::after {
    position: absolute;
    right: 18px;
    bottom: 0;
    left: 18px;
    height: 3px;
    background: transparent;
    content: "";
}

.cases-top-nav a:hover,
.cases-top-nav a:focus-visible,
.cases-top-nav a.is-active {
    color: var(--case-white);
}

.cases-top-nav a.is-active::after {
    background: var(--case-bronze);
}

.cases-intro {
    position: relative;
    overflow: hidden;
    min-height: 280px;
    color: var(--case-white);
    background: var(--case-navy-deep);
}

.cases-intro::after {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 38%;
    height: 4px;
    background: var(--case-bronze);
    content: "";
}

.cases-intro-grid {
    display: grid;
    min-height: 280px;
    align-items: center;
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 48px;
}

.cases-eyebrow,
.cases-section-number {
    margin: 0 0 14px;
    color: var(--case-bronze);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0;
}

.cases-intro h1 {
    margin: 0;
    font-size: clamp(42px, 6vw, 76px);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: 0;
}

.cases-lead {
    max-width: 720px;
    margin: 22px 0 0;
    color: rgba(255, 255, 255, 0.74);
    font-size: 17px;
    line-height: 1.9;
}

.cases-intro-index {
    padding-left: 32px;
    border-left: 1px solid rgba(255, 255, 255, 0.18);
}

.cases-intro-index strong,
.cases-intro-index span {
    display: block;
}

.cases-intro-index strong {
    font-family: Georgia, "Times New Roman", serif;
    font-size: 64px;
    font-weight: 400;
    line-height: 1;
}

.cases-intro-index span {
    margin-top: 10px;
    color: rgba(255, 255, 255, 0.58);
    font-size: 12px;
}

.cases-catalog {
    padding: 72px 0 96px;
}

.cases-catalog-head,
.related-cases-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
}

.cases-catalog-head h2,
.related-cases-head h2,
.case-detail-content h2 {
    margin: 0;
    color: var(--case-navy);
    font-size: 30px;
    line-height: 1.2;
    letter-spacing: 0;
}

.cases-search {
    display: flex;
    width: min(320px, 100%);
    height: 44px;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    background: var(--case-white);
    border: 1px solid var(--case-border);
    border-radius: 3px;
}

.cases-search:focus-within {
    border-color: var(--case-bronze);
    box-shadow: 0 0 0 3px rgba(182, 143, 117, 0.16);
}

.cases-search i {
    color: var(--case-bronze-deep);
}

.cases-search input {
    width: 100%;
    min-width: 0;
    color: var(--case-ink);
    background: transparent;
    border: 0;
    outline: 0;
}

.cases-filters {
    display: flex;
    margin: 30px 0;
    overflow-x: auto;
    gap: 6px;
    scrollbar-width: thin;
}

.cases-filter {
    flex: 0 0 auto;
    min-height: 38px;
    padding: 9px 16px;
    color: var(--case-muted);
    background: var(--case-white);
    border: 1px solid var(--case-border);
    border-radius: 3px;
    font-size: 13px;
    font-weight: 600;
}

.cases-filter:hover,
.cases-filter:focus-visible,
.cases-filter.is-active {
    color: var(--case-white);
    background: var(--case-navy);
    border-color: var(--case-navy);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.case-card {
    min-width: 0;
    overflow: hidden;
    background: var(--case-white);
    border: 1px solid var(--case-border);
    border-radius: 4px;
    transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.case-card:hover,
.case-card:focus-within {
    border-color: rgba(182, 143, 117, 0.8);
    box-shadow: 0 16px 38px rgba(0, 49, 83, 0.12);
    transform: translateY(-4px);
}

.case-card-link {
    display: block;
    height: 100%;
}

.case-card-media {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    background: #dfe5e8;
}

.case-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 360ms ease;
}

.case-card:hover .case-card-media img {
    transform: scale(1.035);
}

.case-card-media > span {
    position: absolute;
    top: 12px;
    right: 12px;
    display: inline-flex;
    width: 38px;
    height: 28px;
    align-items: center;
    justify-content: center;
    color: var(--case-white);
    background: rgba(0, 49, 83, 0.88);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 13px;
}

.case-card-body {
    display: flex;
    min-height: 210px;
    padding: 22px 24px 24px;
    flex-direction: column;
}

.case-card-body > p {
    margin: 0 0 9px;
    color: var(--case-bronze-deep);
    font-size: 12px;
    font-weight: 700;
}

.case-card-body h3 {
    margin: 0;
    color: var(--case-navy);
    font-size: 21px;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 0;
}

.case-card-summary {
    display: -webkit-box;
    margin-top: 12px;
    overflow: hidden;
    color: var(--case-muted);
    font-size: 14px;
    line-height: 1.7;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.case-card-action {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 7px;
    margin-top: auto;
    padding-top: 20px;
    color: var(--case-navy);
    font-size: 13px;
    font-weight: 700;
}

.case-card-action i {
    color: var(--case-bronze-deep);
    font-size: 18px;
}

.cases-empty {
    padding: 80px 20px;
    text-align: center;
    background: var(--case-white);
    border: 1px solid var(--case-border);
}

.cases-empty.is-hidden,
.case-card.is-hidden {
    display: none;
}

.cases-empty i {
    color: var(--case-bronze);
    font-size: 34px;
}

.cases-empty h3 {
    margin: 14px 0 7px;
    color: var(--case-navy);
    letter-spacing: 0;
}

.cases-empty p {
    margin: 0;
    color: var(--case-muted);
}

.cases-footer {
    padding: 34px 0;
    color: rgba(255, 255, 255, 0.72);
    background: var(--case-navy-deep);
    border-top: 3px solid var(--case-bronze);
}

.cases-footer-inner,
.cases-footer-inner > div,
.cases-footer-contact {
    display: flex;
    align-items: center;
}

.cases-footer-inner {
    justify-content: space-between;
    gap: 30px;
}

.cases-footer-inner > div:first-child {
    min-width: 0;
    gap: 18px;
}

.cases-footer img {
    width: 190px;
    max-height: 46px;
    object-fit: contain;
}

.cases-footer p {
    margin: 0;
    color: var(--case-white);
    font-size: 13px;
}

.cases-footer-contact {
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 7px 20px;
    font-size: 12px;
}

.cases-footer-contact a:hover,
.cases-footer-contact a:focus-visible {
    color: var(--case-bronze);
}

.case-detail-hero {
    position: relative;
    min-height: min(650px, 72vh);
    overflow: hidden;
    color: var(--case-white);
    background: var(--case-navy-deep);
}

.case-detail-hero > img,
.case-detail-overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.case-detail-hero > img {
    object-fit: cover;
}

.case-detail-overlay {
    background: rgba(0, 35, 59, 0.72);
}

.case-detail-heading {
    position: relative;
    z-index: 1;
    display: flex;
    min-height: min(650px, 72vh);
    align-items: flex-start;
    justify-content: center;
    flex-direction: column;
    padding-top: 40px;
    padding-bottom: 48px;
}

.case-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 70px;
    color: rgba(255, 255, 255, 0.78);
    font-size: 13px;
    font-weight: 600;
}

.case-back:hover,
.case-back:focus-visible {
    color: var(--case-bronze);
}

.case-detail-heading > p {
    margin: 0 0 14px;
    color: var(--case-bronze);
    font-size: 13px;
    font-weight: 700;
}

.case-detail-heading h1 {
    max-width: 960px;
    margin: 0;
    font-size: clamp(38px, 6vw, 72px);
    line-height: 1.12;
    letter-spacing: 0;
}

.case-detail-heading > div {
    max-width: 760px;
    margin-top: 22px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 16px;
    line-height: 1.9;
}

.case-detail-content {
    padding: 76px 0 92px;
    background: var(--case-white);
}

.case-detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 80px;
}

.case-rich-text {
    margin-top: 28px;
    color: #43545f;
    font-size: 16px;
    line-height: 2;
    white-space: pre-line;
}

.case-video-section {
    margin-top: 44px;
}

.case-video-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 14px;
}

.case-video-heading p {
    margin: 0;
    color: var(--case-bronze);
    font-size: 11px;
    font-weight: 700;
}

.case-video-heading h3 {
    margin: 0;
    color: var(--case-navy);
    font-size: 18px;
    font-weight: 700;
    text-align: right;
}

.case-video-player {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    background: #061a28;
    border: 1px solid #173d56;
    border-bottom: 3px solid var(--case-bronze);
    border-radius: 3px;
    box-shadow: 0 18px 42px rgba(0, 35, 59, 0.14);
}

.case-video-player video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.case-facts {
    align-self: start;
    border-top: 3px solid var(--case-bronze);
}

.case-facts > div {
    padding: 20px 0;
    border-bottom: 1px solid var(--case-border);
}

.case-facts span,
.case-facts strong {
    display: block;
}

.case-facts span {
    margin-bottom: 8px;
    color: var(--case-muted);
    font-size: 12px;
}

.case-facts strong {
    color: var(--case-navy);
    font-size: 15px;
}

.case-tags p {
    display: flex;
    margin: 0;
    flex-wrap: wrap;
    gap: 6px;
}

.case-tags em {
    padding: 5px 8px;
    color: var(--case-green);
    background: #e8f1ee;
    border-radius: 2px;
    font-size: 11px;
    font-style: normal;
}

.case-gallery {
    display: grid;
    margin-top: 44px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.case-gallery-item {
    min-width: 0;
    padding: 0;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    cursor: zoom-in;
    background: #e6eaed;
    border: 0;
    border-radius: 3px;
}

.case-gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 220ms ease;
}

.case-gallery-item:hover img,
.case-gallery-item:focus-visible img {
    transform: scale(1.03);
}

.related-cases {
    padding: 68px 0 88px;
    border-top: 1px solid var(--case-border);
}

.related-cases-head {
    margin-bottom: 28px;
}

.related-cases-head > a {
    color: var(--case-navy);
    border-bottom: 1px solid var(--case-bronze);
    font-size: 13px;
    font-weight: 700;
}

.cases-grid-related .case-card-body {
    min-height: 146px;
}

.case-lightbox {
    width: min(1180px, calc(100% - 40px));
    max-width: none;
    padding: 0;
    overflow: visible;
    background: transparent;
    border: 0;
}

.case-lightbox::backdrop {
    background: rgba(0, 24, 40, 0.9);
}

.case-lightbox img {
    width: 100%;
    max-height: 84vh;
    object-fit: contain;
}

.case-lightbox button {
    position: absolute;
    top: -42px;
    right: 0;
    width: 36px;
    height: 36px;
    padding: 0;
    color: var(--case-white);
    cursor: pointer;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: 50%;
    font-size: 25px;
    line-height: 1;
}

.case-not-found-page {
    min-height: 100vh;
    color: var(--case-white);
    background: var(--case-navy-deep);
}

.case-not-found {
    display: flex;
    width: min(760px, calc(100% - 48px));
    min-height: 100vh;
    margin: 0 auto;
    align-items: flex-start;
    justify-content: center;
    flex-direction: column;
}

.case-not-found .cases-brand {
    margin-bottom: 70px;
}

.case-not-found > p {
    color: var(--case-bronze);
    font-size: 12px;
    font-weight: 700;
}

.case-not-found h1 {
    margin: 6px 0 18px;
    font-size: clamp(36px, 7vw, 64px);
    letter-spacing: 0;
}

.case-not-found > div {
    color: rgba(255, 255, 255, 0.7);
}

.case-primary-link {
    display: inline-flex;
    margin-top: 36px;
    padding: 12px 20px;
    color: var(--case-navy);
    background: var(--case-bronze);
    border-radius: 3px;
    font-weight: 700;
}

@media (max-width: 900px) {
    .cases-container {
        width: min(100% - 36px, 720px);
    }

    .cases-header {
        height: 68px;
    }

    .cases-brand img {
        width: min(210px, 46vw);
        max-height: 44px;
    }

    .cases-top-nav a {
        min-width: auto;
        padding: 0 11px;
        font-size: 12px;
    }

    .cases-top-nav a:first-child,
    .cases-top-nav a:last-child {
        display: none;
    }

    .cases-intro-grid {
        min-height: 260px;
        grid-template-columns: minmax(0, 1fr) 100px;
        gap: 24px;
    }

    .cases-intro-index {
        padding-left: 20px;
    }

    .cases-intro-index strong {
        font-size: 48px;
    }

    .cases-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 18px;
    }

    .case-detail-layout {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .case-facts {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .case-facts > div {
        padding-right: 16px;
    }

    .cases-footer-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .cases-footer-contact {
        justify-content: flex-start;
    }
}

@media (max-width: 600px) {
    .cases-container {
        width: calc(100% - 28px);
    }

    .cases-intro,
    .cases-intro-grid {
        min-height: 300px;
    }

    .cases-intro-grid {
        grid-template-columns: 1fr;
        gap: 22px;
        padding-top: 40px;
        padding-bottom: 36px;
    }

    .cases-intro-index {
        display: flex;
        align-items: baseline;
        gap: 10px;
        padding: 0;
        border: 0;
    }

    .cases-intro-index strong {
        font-size: 34px;
    }

    .cases-intro-index span {
        margin: 0;
    }

    .cases-lead {
        font-size: 14px;
        line-height: 1.75;
    }

    .cases-catalog,
    .case-detail-content,
    .related-cases {
        padding-top: 48px;
        padding-bottom: 60px;
    }

    .cases-catalog-head {
        align-items: stretch;
        flex-direction: column;
    }

    .cases-search {
        width: 100%;
    }

    .cases-filters {
        margin: 24px 0;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .case-card-body {
        min-height: 190px;
    }

    .case-detail-hero,
    .case-detail-heading {
        min-height: 560px;
    }

    .case-back {
        margin-bottom: 56px;
    }

    .case-detail-heading > div {
        font-size: 14px;
    }

    .case-facts {
        grid-template-columns: 1fr;
    }

    .case-gallery {
        grid-template-columns: 1fr;
    }

    .case-video-section {
        margin-top: 34px;
    }

    .case-video-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 5px;
    }

    .case-video-heading h3 {
        font-size: 16px;
        text-align: left;
    }

    .cases-footer-inner > div:first-child {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .case-card,
    .case-card-media img,
    .case-gallery-item img {
        transition: none;
    }
}