:root {
    --primary: #0f6bff;
    --primary-2: #005bea;
    --primary-soft: #eaf3ff;
    --primary-soft-2: #f4f9ff;
    --dark: #0d1735;
    --text: #18233f;
    --muted: #64708a;
    --line: #dfe8f6;
    --card: #fff;
    --bg: #fff;
    --bg-soft: #f7fbff;
    --shadow: 0 18px 50px rgba(19,75,145,.10);
    --radius: 20px;
    --radius-sm: 14px;
    --max: 1200px;
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

body {
    margin: 0;
    font-family: Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6
}

    body.dark {
        --dark: #f6f9ff;
        --text: #eef4ff;
        --muted: #a9b8d8;
        --line: rgba(255,255,255,.13);
        --card: #101a37;
        --bg: #071126;
        --bg-soft: #0a1833;
        --primary-soft: #112b55;
        --primary-soft-2: #0d1f3e;
        --shadow: 0 18px 50px rgba(0,0,0,.35)
    }

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

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

button, input, select {
    font: inherit
}

.container {
    width: min(var(--max), calc(100% - 44px));
    margin: auto
}

.hide {
    display: none !important
}

.header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(16px);
    background: rgba(255,255,255,.88);
    border-bottom: 1px solid var(--line)
}

body.dark .header {
    background: rgba(7,17,38,.84)
}

.nav {
    height: 88px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px
}

.logo {
    font-size: 34px;
    font-weight: 750;
    letter-spacing: -1.6px;
    color: #071126
}

    .logo span {
        color: var(--primary)
    }

body.dark .logo {
    color: #fff
}

.menu {
    display: flex;
    align-items: center;
    gap: 34px;
    font-weight: 500;
    color: #071126
}

    .menu a {
        font-size: 15px
    }

        .menu a.active, .menu a:hover {
            color: var(--primary)
        }

body.dark .menu {
    color: #fff
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 14px
}

.icon-btn {
    width: 42px;
    height: 42px;
    border: 0;
    background: transparent;
    color: #071126;
    border-radius: 12px;
    display: grid;
    place-items: center;
    cursor: pointer
}

    .icon-btn:hover {
        background: var(--primary-soft);
        color: var(--primary)
    }

body.dark .icon-btn {
    color: #fff
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 50px;
    padding: 0 26px;
    border-radius: 10px;
    border: 1px solid transparent;
    font-weight: 750;
    cursor: pointer;
    transition: .2s
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 12px 26px rgba(15,107,255,.22)
}

    .btn-primary:hover {
        background: var(--primary-2);
        transform: translateY(-2px)
    }

.btn-light {
    background: #fff;
    border-color: var(--line);
    color: #071126;
    box-shadow: 0 10px 24px rgba(13,23,53,.05)
}

body.dark .btn-light {
    background: #101a37;
    color: #fff
}

.mobile-toggle {
    display: none
}

.hero {
    background: radial-gradient(circle at 72% 24%, rgba(15,107,255,.14), transparent 30%),linear-gradient(180deg,#f7fbff 0%,#fff 82%);
    border-bottom: 1px solid rgba(223,232,246,.55)
}

body.dark .hero {
    background: radial-gradient(circle at 65% 20%, rgba(15,107,255,.2), transparent 34%),linear-gradient(180deg,#071126,#0a1833)
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 48px;
    align-items: center;
    padding: 76px 0 66px
}

.badge {
    display: inline-flex;
    align-items: center;
    background: #ddecff;
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 750;
    text-transform: uppercase
}

.hero h1 {
    margin: 28px 0 20px;
    color: #0b1433;
    font-size: 56px;
    line-height: 1.15;
    letter-spacing: -2.8px
}

    .hero h1 span, .title-highlight {
        color: var(--primary)
    }

body.dark .hero h1 {
    color: #fff
}

.hero p {
    font-size: 21px;
    color: #33405f;
    max-width: 650px;
    margin: 0 0 30px
}

body.dark .hero p {
    color: #c6d4ef
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap
}

.hero-art {
    filter: drop-shadow(0 28px 40px rgba(15,107,255,.12))
}

    .hero-art img {
        width: 100%;
        height: auto
    }

.stats {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 22px;
    margin-top: 60px
}

.stat {
    display: flex;
    align-items: center;
    gap: 12px
}

.stat-ico {
    width: 31px;
    height: 31px;
    color: var(--primary);
    font-size: 35px;
}

.stat strong {
    display: block;
    font-size: 16px;
    color: #071126
}

.stat span {
    display: block;
    /*font-size: 13px;
    color: #33405f*/
}

body.dark .stat strong, body.dark .stat span {
    color: #eff6ff
}

.section {
    padding: 64px 0
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 26px;
    gap: 20px
}

.section-title {
    font-size: 28px;
    line-height: 1.2;
    letter-spacing: -.8px;
    color: #071126;
    margin: 0
}

body.dark .section-title {
    color: #fff
}

.link-more {
    color: var(--primary);
    font-weight: 750
}

    .link-more:hover {
        text-decoration: underline
    }

.articles {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 24px
}

.article-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 24px rgba(19,75,145,.04);
    transition: .2s
}

    .article-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow)
    }

.article-img {
    height: 220px;
    object-fit: cover;
    width: 100%;
    background: #061640
}

.card-body {
    padding: 22px
}

.article-card h3 {
    margin: 0 0 14px;
    color: #071126;
    font-size: 22px;
    line-height: 1.28;
    letter-spacing: -.45px
}

body.dark .article-card h3 {
    color: #fff
}

.article-card p {
    margin: 0 0 24px;
    color: #44506c
}

.meta {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    color: #42506c;
    font-size: 13px;
    flex-wrap: wrap
}

.chip {
    display: inline-flex;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 12px;
    font-weight: 750
}

.chip-green {
    background: #3fbf5b
}

.chip-purple {
    background: #7047ff
}

.chip-orange {
    background: #ff7a1a
}

.chip-sky {
    background: #4b95ff
}

.chip-emerald {
    background: #28a86d
}

.thumb-wrap {
    position: relative
}

    .thumb-wrap .chip {
        position: absolute;
        left: 20px;
        top: 20px;
        z-index: 2
    }

.categories {
    display: grid;
    grid-template-columns: repeat(6,1fr);
    gap: 20px
}

.cat-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    min-height: 155px;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 22px;
    transition: .2s
}

    .cat-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow);
        border-color: #c7dcff
    }

.cat-icon {
    width: 58px;
    height: 58px;
    border-radius: 17px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    font-size: 28px;
    margin-bottom: 12px
}

.cat-card h3 {
    margin: 0 0 12px;
    color: #071126;
    font-size: 16px
}

.cat-card p {
    margin: 0;
    color: #44506c;
    font-size: 14px
}

body.dark .cat-card h3 {
    color: #fff
}

.newsletter-band {
    display: grid;
    grid-template-columns: 240px 1fr 430px;
    align-items: center;
    gap: 24px;
    padding: 30px 40px;
    background: linear-gradient(100deg,#eef6ff,#f9fcff);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 18px 46px rgba(19,75,145,.06)
}

body.dark .newsletter-band {
    background: linear-gradient(100deg,#0b1b3a,#0d244a)
}

.mail-illu img {
    width: 210px
}

.newsletter-copy h2 {
    margin: 0 0 8px;
    color: #071126;
    font-size: 25px
}

body.dark .newsletter-copy h2 {
    color: #fff
}

.newsletter-copy p {
    margin: 0;
    color: #33405f
}

body.dark .newsletter-copy p {
    color: #c6d4ef
}

.subscribe-form {
    display: flex;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden
}

    .subscribe-form input {
        flex: 1;
        border: 0;
        padding: 0 22px;
        outline: 0;
        color: #071126
    }

    .subscribe-form .btn {
        border-radius: 8px;
        margin: 0;
        min-height: 58px
    }

.mini-subscribe {
    display: flex;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
    overflow: hidden
}

    .mini-subscribe input {
        min-width: 0;
        flex: 1;
        border: 0;
        padding: 0 16px;
        outline: 0
    }

    .mini-subscribe button {
        width: 52px;
        border: 0;
        background: #fff;
        color: var(--primary);
        font-size: 20px;
        cursor: pointer
    }

.footer {
    padding: 64px 0 28px
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.35fr .85fr .95fr .95fr 1.25fr;
    gap: 38px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 42px
}

.footer p {
    color: #46536f
}

.footer h4 {
    margin: 0 0 16px;
    color: #071126
}

body.dark .footer h4 {
    color: #fff
}

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

.footer li {
    margin: 9px 0
}

.footer a:hover {
    color: var(--primary)
}

.socials {
    display: flex;
    gap: 12px;
    margin-top: 18px
}

    .socials a {
        width: 30px;
        height: 30px;
        border-radius: 8px;
        background: #071126;
        color: #fff;
        display: grid;
        place-items: center;
        font-size: 13px;
        font-weight: 750
    }

.copyright {
    text-align: center;
    margin: 28px 0 0;
    color: #52607c;
    font-size: 14px
}

.article-list-page {
    padding: 34px 0 70px
}

.toolbar {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: flex-start;
    margin-bottom: 25px
}

.filters {
    display: flex;
    gap: 16px;
    flex-wrap: wrap
}

.filter-select, .search-input {
    height: 52px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--card);
    color: var(--text);
    padding: 0 20px;
    outline: 0
}

.filter-select {
    min-width: 200px
}

.search-input {
    width: 360px
}

.found-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 10px 0 28px
}

.view-toggle {
    display: flex;
    gap: 8px;
    background: var(--primary-soft-2);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 6px
}

    .view-toggle button {
        border: 0;
        background: transparent;
        width: 42px;
        height: 38px;
        border-radius: 8px;
        cursor: pointer;
        color: #071126
    }

        .view-toggle button.active {
            background: var(--primary);
            color: #fff
        }

.layout-with-sidebar {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 36px
}

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

    .article-grid.list-view {
        grid-template-columns: 1fr
    }

        .article-grid.list-view .article-card {
            display: grid;
            grid-template-columns: 320px 1fr
        }

        .article-grid.list-view .article-img {
            height: 100%
        }

.side-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 12px 30px rgba(19,75,145,.04)
}

    .side-card h3 {
        margin: 0 0 18px;
        color: #071126;
        font-size: 21px
    }

body.dark .side-card h3 {
    color: #fff
}

.side-list {
    display: grid;
    gap: 16px
}

    .side-list a {
        display: flex;
        justify-content: space-between;
        gap: 12px;
        align-items: center;
        color: #0b1433;
        font-weight: 750
    }

    .side-list span {
        color: #61708d;
        font-weight: 500
    }

body.dark .side-list a {
    color: #fff
}

.breadcrumb {
    display: flex;
    gap: 10px;
    align-items: center;
    color: #54627e;
    font-size: 14px;
    margin: 30px 0
}

.detail-layout {
    display: grid;
    grid-template-columns: minmax(0,760px) 340px;
    gap: 76px;
    align-items: start
}

.article-hero h1 {
    font-size: 48px;
    line-height: 1.12;
    letter-spacing: -2px;
    color: #0b1433;
    margin: 22px 0 14px
}

body.dark .article-hero h1 {
    color: #fff
}

.article-hero .lead {
    font-size: 20px;
    color: #485671;
    margin-bottom: 24px
}

.author-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin: 26px 0
}

.author-mini {
    display: flex;
    align-items: center;
    gap: 14px
}

    .author-mini img {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        object-fit: cover
    }

    .author-mini strong {
        display: block;
        color: #071126
    }

.share {
    display: flex;
    gap: 12px
}

    .share a {
        width: 42px;
        height: 42px;
        border: 1px solid var(--line);
        border-radius: 10px;
        display: grid;
        place-items: center;
        color: #071126;
        font-weight: 750
    }

.feature-img {
    border-radius: 12px;
    width: 100%;
    height: auto;
    margin: 18px 0 30px
}

.article-intro-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 42px;
    margin: 30px 0
}

.key-box {
    background: linear-gradient(180deg,#f2f7ff,#fff);
    border: 1px solid #cfe0fb;
    border-radius: 12px;
    padding: 24px
}

    .key-box h3 {
        margin-top: 0;
        color: #071126
    }

    .key-box ul {
        padding: 0;
        margin: 0;
        list-style: none;
        display: grid;
        gap: 14px
    }

    .key-box li {
        display: flex;
        gap: 10px;
        align-items: flex-start
    }

.check {
    min-width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: inline-grid;
    place-items: center;
    font-size: 12px;
    margin-top: 3px
}

.article-content {
    font-size: 17px;
    color: #2f3d5a
}

    .article-content h2 {
        font-size: 26px;
        line-height: 1.25;
        color: #071126;
        margin: 34px 0 12px;
        padding-top: 14px;
        border-top: 1px solid var(--line)
    }

body.dark .article-content h2 {
    color: #fff
}

.article-content p {
    margin: 0 0 16px
}

.article-content ul {
    margin: 0 0 22px;
    padding-left: 22px
}

.callout, .quote {
    background: #f6f9ff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--primary);
    border-radius: 10px;
    padding: 16px 18px;
    margin: 18px 0;
    color: #24314d;
    font-weight: 700
}

.quote {
    font-size: 19px;
    font-style: italic
}

.doc-image-box {
    margin: 34px 0;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px
}

    .doc-image-box img {
        border-radius: 8px;
        margin: auto
    }

.references {
    font-size: 14px;
    color: #45536f
}

    .references li {
        margin-bottom: 12px
    }

.related {
    margin-top: 46px;
    padding-top: 26px;
    border-top: 1px solid var(--line)
}

.toc {
    position: sticky;
    top: 112px
}

    .toc ol {
        margin: 0;
        padding-left: 20px;
        display: grid;
        gap: 14px
    }

    .toc a {
        color: #30405f
    }

        .toc a:hover, .toc a.active {
            color: var(--primary);
            font-weight: 750
        }

.download-link {
    display: inline-flex;
    margin-top: 24px;
    color: var(--primary);
    font-weight: 750
}

.author-card .author-head {
    display: flex;
    gap: 16px;
    align-items: center
}

.author-card img {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover
}

.author-card h4 {
    margin: 0;
    color: #071126
}

.author-card .role {
    margin: 3px 0 0;
    color: #54627e
}

.author-card p {
    font-size: 15px
}

.not-found {
    padding: 80px 0;
    text-align: center
}

.search-modal {
    position: fixed;
    inset: 0;
    background: rgba(7,17,38,.35);
    z-index: 80;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 120px
}

    .search-modal.open {
        display: flex
    }

.search-box {
    width: min(720px,calc(100% - 32px));
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 24px;
    box-shadow: var(--shadow)
}

    .search-box label {
        display: block;
        font-size: 22px;
        font-weight: 750;
        margin-bottom: 14px
    }

    .search-box .row {
        display: flex;
        gap: 12px
    }

    .search-box input {
        flex: 1;
        height: 54px;
        border: 1px solid var(--line);
        border-radius: 10px;
        padding: 0 16px;
        outline: 0
    }

.menu-backdrop {
    display: none
}

@media (max-width:1100px) {
    .articles {
        grid-template-columns: repeat(2,1fr)
    }

    .categories {
        grid-template-columns: repeat(3,1fr)
    }

    .newsletter-band {
        grid-template-columns: 1fr
    }

    .mail-illu {
        display: none
    }

    .footer-grid {
        grid-template-columns: repeat(2,1fr)
    }

    .layout-with-sidebar, .detail-layout {
        grid-template-columns: 1fr
    }

    .toc {
        position: static
    }

    .article-grid {
        grid-template-columns: repeat(2,1fr)
    }

    .article-intro-grid {
        grid-template-columns: 1fr
    }

    .side-column {
        order: -1
    }
}

@media (max-width:820px) {
    .container {
        width: min(100% - 28px,var(--max))
    }

    .nav {
        height: 76px
    }

    .mobile-toggle {
        display: grid
    }

    .menu {
        position: fixed;
        inset: 76px 0 auto 0;
        background: var(--card);
        border-bottom: 1px solid var(--line);
        padding: 22px;
        flex-direction: column;
        align-items: flex-start;
        display: none
    }

        .menu.open {
            display: flex
        }

    .nav-actions .icon-btn.search {
        display: none
    }

    .hero-grid {
        grid-template-columns: 1fr;
        padding: 42px 0
    }

    .hero-art {
        display: none
    }

    .hero h1 {
        font-size: 38px;
        letter-spacing: -1.5px
    }

    .hero p {
        font-size: 17px
    }

    .stats {
        grid-template-columns: 1fr 1fr;
        margin-top: 38px
    }

    .articles, .article-grid {
        grid-template-columns: 1fr
    }

        .article-grid.list-view .article-card {
            display: block
        }

    .toolbar {
        display: block
    }

    .filters {
        margin-bottom: 16px
    }

    .filter-select, .search-input {
        width: 100%
    }

    .found-row {
        align-items: flex-start
    }

    .categories {
        grid-template-columns: 1fr 1fr
    }

    .subscribe-form, .search-box .row {
        flex-direction: column;
        padding: 8px
    }

        .subscribe-form input {
            min-height: 52px
        }

    .footer-grid {
        grid-template-columns: 1fr
    }

    .article-hero h1 {
        font-size: 34px
    }

    .article-hero .lead {
        font-size: 17px
    }

    .author-row {
        align-items: flex-start;
        flex-direction: column
    }

    .detail-layout {
        gap: 28px
    }
}

@media (max-width:520px) {
    .logo {
        font-size: 29px
    }

    .nav-actions .btn-primary {
        display: none
    }

    .hero-cta .btn {
        width: 100%
    }

    .stats, .categories {
        grid-template-columns: 1fr
    }

    .article-img {
        height: 190px
    }

    .section {
        padding: 42px 0
    }

    .section-head {
        display: block
    }

    .newsletter-band {
        padding: 24px
    }

    .card-body {
        padding: 18px
    }
}

.side-card .newsletter-band {
    display: block;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none
}

    .side-card .newsletter-band .mail-illu {
        display: block;
        margin-bottom: 14px
    }

        .side-card .newsletter-band .mail-illu img {
            width: 120px
        }

    .side-card .newsletter-band .newsletter-copy h2 {
        font-size: 20px
    }

    .side-card .newsletter-band .newsletter-copy p {
        font-size: 14px;
        margin-bottom: 18px
    }

    .side-card .newsletter-band .subscribe-form {
        display: flex
    }

        .side-card .newsletter-band .subscribe-form input {
            min-width: 0
        }

        .side-card .newsletter-band .subscribe-form .btn {
            min-width: 130px;
            padding: 0 16px
        }