:root {
    --ink: #151b24;
    --muted: #667386;
    --line: #e4e9f1;
    --panel: #ffffff;
    --soft: #f6f8fc;
    --brand: #0967d8;
    --brand-dark: #064fa6;
    --cyan: #14b8f4;
    --coral: #ff5b52;
    --green: #08b66c;
    --red: #d4423a;
    --shadow: 0 24px 70px rgba(21, 27, 36, 0.12);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 78% 0%, rgba(20, 184, 244, 0.15), transparent 30%),
        linear-gradient(180deg, #ffffff 0%, #f6f8fc 44%, #edf3fb 100%);
    letter-spacing: 0;
}

a {
    color: inherit;
}

.site-shell {
    min-height: 100vh;
}

.site-nav {
    width: min(1320px, calc(100% - 48px));
    min-height: 82px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
    text-decoration: none;
    font-size: 18px;
    font-weight: 850;
}

.site-logo {
    width: 58px;
    height: 58px;
    object-fit: contain;
    flex: 0 0 auto;
}

.brand-logos {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
    padding: 5px 8px 5px 10px;
    border: 1px solid rgba(228, 233, 241, 0.72);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.58);
    box-shadow: 0 12px 28px rgba(21, 27, 36, 0.05);
}

.partner-logo {
    width: 126px;
    height: 46px;
    object-fit: contain;
    flex: 0 0 auto;
}

.logo-divider {
    width: 1px;
    height: 32px;
    background: rgba(102, 115, 134, 0.18);
    flex: 0 0 auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-links a,
.nav-pill {
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 14px;
    border: 1px solid rgba(228, 233, 241, 0.96);
    border-radius: 999px;
    color: #3b4656;
    background: rgba(255, 255, 255, 0.72);
    font-size: 14px;
    font-weight: 650;
    text-decoration: none;
}

.nav-links a.active,
.nav-links a:hover,
.nav-pill.active {
    color: #fff;
    background: var(--ink);
    border-color: var(--ink);
}

.page-wrap {
    width: min(1180px, calc(100% - 48px));
    margin: 0 auto;
    padding: 18px 0 54px;
}

.home-hero,
.page-hero {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.82)),
        url("/static/login-bg-ai-service.png") right center / cover no-repeat;
    box-shadow: var(--shadow);
}

.home-hero {
    min-height: 410px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
    gap: 28px;
    align-items: center;
    padding: clamp(32px, 6vw, 64px);
}

.page-hero {
    padding: clamp(26px, 5vw, 46px);
    margin-bottom: 20px;
}

.hero-copy {
    max-width: 760px;
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--brand);
    font-size: 12px;
    font-weight: 850;
    text-transform: uppercase;
}

.home-hero h1,
.page-hero h1 {
    margin: 0;
    font-weight: 850;
    line-height: 1.02;
    letter-spacing: 0;
}

.home-hero h1 {
    font-size: clamp(46px, 8vw, 86px);
}

.page-hero h1 {
    font-size: clamp(34px, 6vw, 58px);
}

.hero-copy p,
.page-hero p {
    max-width: 680px;
    margin: 18px 0 0;
    color: #445166;
    font-size: 18px;
    line-height: 1.75;
}

.hero-visual {
    min-height: 260px;
    display: grid;
    place-items: center;
}

.hero-visual img {
    width: min(260px, 78%);
    filter: drop-shadow(0 22px 36px rgba(9, 103, 216, 0.22));
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 20px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 750;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-primary {
    color: #fff;
    background: var(--ink);
    box-shadow: 0 14px 30px rgba(21, 27, 36, 0.18);
}

.btn-secondary {
    color: var(--ink);
    background: #fff;
    border-color: var(--line);
}

.section-block {
    margin-top: 26px;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 20px;
    margin-bottom: 14px;
}

.section-title {
    margin: 0;
    font-size: 28px;
}

.section-heading > p {
    max-width: 430px;
    margin: 0 0 4px;
    color: var(--muted);
    line-height: 1.6;
    text-align: right;
}

.home-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.75fr);
    gap: 18px;
    align-items: start;
}

.article-grid,
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.article-list,
.news-list {
    display: grid;
    gap: 14px;
}

.article-card,
.news-card,
.knowledge-card,
.article-shell,
.login-card,
.admin-panel {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: 0 12px 34px rgba(21, 27, 36, 0.07);
}

.article-card,
.news-card,
.knowledge-card {
    padding: 22px;
    min-width: 0;
}

.article-card:hover,
.news-card:hover,
.knowledge-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 48px rgba(21, 27, 36, 0.11);
}

.card-title {
    margin: 0;
    font-size: 20px;
    line-height: 1.35;
}

.card-title a {
    color: var(--ink);
    text-decoration: none;
}

.card-title a:hover {
    color: var(--brand);
}

.article-preview,
.card-summary {
    margin: 12px 0 0;
    color: #445166;
    line-height: 1.65;
}

.meta-row {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 14px;
    color: var(--muted);
    font-size: 13px;
}

.compact-meta {
    margin-top: 0;
}

.spaced-title {
    margin-top: 14px;
}

.tag,
.type-badge {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    padding: 0 9px;
    border-radius: 999px;
    color: #244c74;
    background: #edf6ff;
    font-size: 12px;
    font-weight: 750;
}

.type-badge.memory {
    color: #0b6f49;
    background: #e9f9f1;
}

.type-badge.research {
    color: #8a3d00;
    background: #fff3df;
}

.news-card {
    display: block;
}

.news-card h3 {
    margin: 0;
    font-size: 18px;
    line-height: 1.45;
}

.news-date {
    display: block;
    margin-top: 10px;
    color: var(--muted);
    font-size: 13px;
}

.read-link {
    display: inline-flex;
    margin-top: 12px;
    color: var(--brand);
    font-weight: 750;
    text-decoration: none;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.page-indicator {
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    padding: 0 14px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: var(--muted);
    font-size: 13px;
}

.empty-state {
    padding: 26px;
    border: 1px dashed #cbd5e1;
    border-radius: 8px;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.68);
}

.article-shell {
    max-width: 900px;
    margin: 0 auto;
    padding: clamp(24px, 5vw, 54px);
}

.article-header h1 {
    margin: 0;
    font-size: clamp(30px, 5vw, 54px);
    line-height: 1.08;
}

.article-content {
    margin-top: 28px;
    color: #243044;
    font-size: 17px;
    line-height: 1.85;
}

.article-content h1,
.article-content h2,
.article-content h3 {
    margin: 1.6em 0 0.6em;
    line-height: 1.25;
}

.article-content p {
    margin: 1em 0;
}

.article-content a {
    color: var(--brand);
}

.article-content pre {
    padding: 16px;
    overflow-x: auto;
    border-radius: 8px;
    background: #0f172a;
    color: #e2e8f0;
}

.article-content code {
    padding: 0.16em 0.34em;
    border-radius: 5px;
    background: #eef2f7;
}

.article-content pre code {
    padding: 0;
    background: transparent;
}

.article-footer {
    max-width: 900px;
    margin: 18px auto 0;
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.72)),
        url("/static/login-bg-ai-service.png") center / cover no-repeat;
}

.login-card {
    width: min(430px, 100%);
    padding: 34px;
}

.login-brand {
    margin-bottom: 24px;
}

.full-width {
    width: 100%;
}

.login-card h1 {
    margin: 0;
    font-size: 30px;
}

.login-card p {
    margin: 10px 0 22px;
    color: var(--muted);
    line-height: 1.65;
}

.form-field {
    margin-bottom: 14px;
}

.form-label {
    display: block;
    margin-bottom: 7px;
    color: #3b4656;
    font-size: 13px;
    font-weight: 750;
}

.form-control,
input,
textarea {
    width: 100%;
    min-height: 46px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    background: #fff;
    font: inherit;
}

textarea {
    min-height: 180px;
    padding-top: 12px;
    line-height: 1.55;
}

.form-control:focus,
input:focus,
textarea:focus {
    border-color: var(--brand);
    outline: 3px solid rgba(9, 103, 216, 0.14);
}

.alert {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 12px;
    font-size: 14px;
}

.alert-danger {
    color: #9f3128;
    background: #fff0ef;
    border: 1px solid #ffd2cd;
}

.alert-success {
    color: #0b6f49;
    background: #e9f9f1;
    border: 1px solid #c4eed8;
}

.d-none {
    display: none !important;
}

.site-footer {
    padding: 34px 0 10px;
    color: var(--muted);
    text-align: center;
}

.admin-page {
    background:
        radial-gradient(circle at 78% 0%, rgba(20, 184, 244, 0.13), transparent 30%),
        linear-gradient(180deg, #ffffff 0%, #f6f8fc 44%, #edf3fb 100%);
}

.admin-page .navbar.bg-dark {
    background: rgba(255, 255, 255, 0.92) !important;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 34px rgba(21, 27, 36, 0.06);
}

.admin-page .navbar-brand,
.admin-page .navbar-dark .navbar-nav .nav-link,
.admin-page .navbar-dark .navbar-text {
    color: var(--ink) !important;
}

.admin-page .navbar-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 850;
}

.admin-page .navbar-brand .site-logo {
    width: 44px;
    height: 44px;
}

.admin-page .navbar-brand .partner-logo {
    width: 104px;
    height: 38px;
}

.admin-page .navbar-brand .brand-logos {
    padding: 4px 7px 4px 8px;
    gap: 8px;
}

.admin-page .card,
.admin-page .modal-content {
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 12px 34px rgba(21, 27, 36, 0.07);
}

.admin-page .btn-primary {
    border-color: var(--ink);
    background: var(--ink);
}

.admin-page .btn-outline-light {
    color: var(--ink);
    border-color: var(--line);
}

.admin-page .tag {
    margin-right: 4px;
}

@media (max-width: 920px) {
    .home-hero,
    .home-grid,
    .article-grid,
    .knowledge-grid {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        min-height: 180px;
    }

    .section-heading {
        align-items: start;
        flex-direction: column;
    }

    .section-heading > p {
        text-align: left;
    }
}

@media (max-width: 620px) {
    .site-nav,
    .page-wrap {
        width: min(100% - 28px, 1180px);
    }

    .site-nav {
        align-items: flex-start;
        flex-direction: column;
        padding: 16px 0;
    }

    .brand-link {
        gap: 8px;
        max-width: 100%;
    }

    .brand-logos {
        gap: 7px;
        padding: 4px 6px 4px 7px;
    }

    .partner-logo {
        width: 88px;
        height: 34px;
    }

    .site-logo {
        width: 48px;
        height: 48px;
    }

    .logo-divider {
        height: 26px;
    }

    .nav-links {
        justify-content: flex-start;
    }

    .home-hero,
    .page-hero,
    .article-shell,
    .login-card {
        padding: 20px;
    }

    .home-hero h1 {
        font-size: 46px;
    }

    .btn {
        width: 100%;
    }
}