:root {
    --page-bg: #f4f6fb;
    --page-bg-strong: #ffffff;
    --surface: rgba(255, 255, 255, 0.78);
    --surface-strong: rgba(255, 255, 255, 0.92);
    --surface-subtle: rgba(255, 255, 255, 0.58);
    --surface-border: rgba(15, 23, 42, 0.08);
    --text-primary: #0f172a;
    --text-secondary: #52607a;
    --text-muted: #7f8aa3;
    --accent: #2563eb;
    --accent-soft: rgba(37, 99, 235, 0.12);
    --shadow-soft: 0 30px 80px rgba(15, 23, 42, 0.08);
    --shadow-card: 0 20px 50px rgba(15, 23, 42, 0.06);
}

[data-bs-theme="dark"] {
    --page-bg: #08111f;
    --page-bg-strong: #0b1628;
    --surface: rgba(8, 17, 31, 0.7);
    --surface-strong: rgba(10, 20, 36, 0.88);
    --surface-subtle: rgba(15, 23, 42, 0.55);
    --surface-border: rgba(148, 163, 184, 0.16);
    --text-primary: #e2e8f0;
    --text-secondary: #b6c2d2;
    --text-muted: #8fa1b6;
    --accent: #8ab4ff;
    --accent-soft: rgba(138, 180, 255, 0.16);
    --shadow-soft: 0 30px 80px rgba(2, 6, 23, 0.42);
    --shadow-card: 0 20px 50px rgba(2, 6, 23, 0.32);
}

html {
    scroll-behavior: smooth;
}

body.brand-page {
    position: relative;
    min-height: 100vh;
    margin: 0;
    font-family: "Manrope", sans-serif;
    color: var(--text-primary);
    background:
        radial-gradient(circle at top left, rgba(96, 165, 250, 0.18), transparent 34%),
        radial-gradient(circle at top right, rgba(255, 255, 255, 0.92), transparent 32%),
        linear-gradient(180deg, var(--page-bg) 0%, var(--page-bg-strong) 100%);
}

body.brand-page::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.22), transparent 85%);
    opacity: 0.34;
}

body.brand-page a {
    color: inherit;
}

body.brand-page .bi {
    vertical-align: -0.125em;
    fill: currentColor;
}

.site-shell {
    position: relative;
    z-index: 1;
    padding: 1.25rem 0 3rem;
}

.site-nav {
    position: sticky;
    top: 1rem;
    z-index: 1030;
    margin-bottom: 2rem;
}

.site-nav .nav-frame {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border: 1px solid var(--surface-border);
    border-radius: 999px;
    background: var(--surface);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-card);
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    text-decoration: none;
}

.brand-mark::before {
    content: "";
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), rgba(255, 255, 255, 0.9));
    box-shadow: 0 0 0 0.35rem var(--accent-soft);
}

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

.nav-links a {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    color: var(--text-secondary);
    font-size: 0.92rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--text-primary);
    background: var(--accent-soft);
    transform: translateY(-1px);
}

.page-shell {
    padding-top: 0.75rem;
}

.page-header-section {
    padding: 1rem 0 1.5rem;
}

.page-header-panel,
.article-shell,
.archive-shell,
.tag-shell,
.site-footer-inner {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--surface-border);
    background: var(--surface-strong);
    box-shadow: var(--shadow-soft);
}

.page-header-panel {
    padding: 3rem clamp(1.5rem, 4vw, 3rem);
    border-radius: 2rem;
}

.page-header-panel::before,
.article-shell::before,
.archive-shell::before,
.tag-shell::before {
    content: "";
    position: absolute;
    inset: auto auto 0 -8%;
    width: 34%;
    aspect-ratio: 1;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.14) 0%, transparent 72%);
    pointer-events: none;
}

.page-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.5rem 0.8rem;
    margin-bottom: 1.2rem;
    border: 1px solid var(--surface-border);
    border-radius: 999px;
    background: var(--surface-subtle);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.page-title {
    margin: 0;
    font-size: clamp(2.4rem, 6vw, 4.4rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.05em;
}

.page-description {
    max-width: 46rem;
    margin: 1.2rem 0 0;
    color: var(--text-secondary);
    font-size: 1.02rem;
    line-height: 1.85;
}

.page-content-section {
    padding-top: 0.5rem;
}

.archive-shell,
.tag-shell,
.article-shell {
    padding: clamp(1.35rem, 3vw, 2rem);
    border-radius: 1.75rem;
}

.archive-shell .text-center,
.tag-shell .text-center {
    position: relative;
    z-index: 1;
}

.archive-shell .btn,
.tag-shell .btn {
    border-radius: 999px;
    border-color: var(--surface-border);
    padding: 0.72rem 1rem;
    font-weight: 700;
}

.archive-shell .btn-light,
.tag-shell .btn-light {
    background: transparent;
    color: var(--text-secondary);
}

.archive-shell .btn-info,
.tag-shell .btn-info {
    background: linear-gradient(135deg, var(--accent), #5b8cff);
    border-color: transparent;
    color: #fff;
}

.archive-shell .post-preview,
.tag-shell .post-preview {
    position: relative;
    z-index: 1;
    padding: 1.3rem 0;
    border-bottom: 1px solid var(--surface-border);
}

.archive-shell .post-preview:last-of-type,
.tag-shell .post-preview:last-of-type {
    border-bottom: none;
}

.archive-shell .post-preview a,
.tag-shell .post-preview a {
    text-decoration: none;
}

.archive-shell .post-title,
.tag-shell .post-title {
    margin: 0;
    font-size: clamp(1.3rem, 3vw, 1.95rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.archive-shell .post-meta,
.tag-shell .post-meta {
    margin: 0.5rem 0 0;
    color: var(--text-secondary);
    font-weight: 600;
}

.archive-shell .pager,
.tag-shell .pager {
    margin: 0;
    padding: 0;
    list-style: none;
}

.tag-shell .tag-preview-hr {
    margin: 1.5rem 0;
    border-color: var(--surface-border);
}

.article-shell > .container {
    position: relative;
    z-index: 1;
}

.article-meta-bar {
    align-items: center;
    gap: 1rem;
    padding: 0.15rem 0 1rem;
    color: var(--text-secondary) !important;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.article-body {
    padding: 0.5rem 0 1rem;
    color: var(--text-primary);
    line-height: 1.95;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
    margin-top: 2.1rem;
    margin-bottom: 0.9rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.article-body h2 {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.article-body h3 {
    font-size: clamp(1.2rem, 3vw, 1.55rem);
}

.article-body p,
.article-body ul,
.article-body ol {
    color: var(--text-secondary);
}

.article-body img {
    display: block;
    max-width: 100%;
    margin: 1.3rem auto;
    border-radius: 1rem;
    box-shadow: var(--shadow-card);
}

.article-body figure.highlight {
    margin: 1.4rem 0;
    border: 1px solid var(--surface-border);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.article-body figure.highlight table {
    width: 100%;
    margin: 0;
}

.article-body blockquote,
.article-body pre,
.article-body table {
    border-color: var(--surface-border);
}

.article-taxonomy {
    position: relative;
    z-index: 1;
    margin-top: 1.2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--surface-border);
}

.article-taxonomy a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    padding: 0.55rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--surface-border);
    background: var(--accent-soft);
    color: var(--text-secondary) !important;
    text-decoration: none !important;
    font-weight: 700;
}

.standalone-shell,
.not-found-shell {
    position: relative;
    overflow: hidden;
    padding: clamp(1.4rem, 3vw, 2rem);
    border: 1px solid var(--surface-border);
    border-radius: 1.75rem;
    background: var(--surface-strong);
    box-shadow: var(--shadow-soft);
}

.standalone-shell::before,
.not-found-shell::before {
    content: "";
    position: absolute;
    inset: auto -6% -18% auto;
    width: 18rem;
    height: 18rem;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, transparent 72%);
    pointer-events: none;
}

.standalone-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.95fr);
    gap: 1.25rem;
}

.standalone-copy p,
.standalone-copy li {
    color: var(--text-secondary);
    line-height: 1.9;
}

.standalone-copy h2,
.standalone-copy h3 {
    margin: 0 0 0.9rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.standalone-copy h2 + p,
.standalone-copy h3 + p {
    margin-top: 0;
}

.standalone-copy ul {
    padding-left: 1.1rem;
    margin-bottom: 0;
}

.standalone-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 1.5rem;
}

.brand-button,
.brand-button-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.9rem 1.2rem;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.brand-button {
    color: #fff;
    background: linear-gradient(135deg, var(--accent), #5b8cff);
    box-shadow: 0 18px 40px rgba(37, 99, 235, 0.22);
}

.brand-button-secondary {
    color: var(--text-primary);
    border: 1px solid var(--surface-border);
    background: var(--surface-subtle);
}

.brand-button:hover,
.brand-button-secondary:hover,
.brand-button:focus-visible,
.brand-button-secondary:focus-visible {
    transform: translateY(-1px);
}

.standalone-side {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 1rem;
}

.info-panel {
    padding: 1.15rem 1.2rem;
    border: 1px solid var(--surface-border);
    border-radius: 1.2rem;
    background: var(--surface-subtle);
}

.info-panel-label {
    margin-bottom: 0.55rem;
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.info-panel-value {
    color: var(--text-primary);
    font-size: 1.02rem;
    font-weight: 700;
    line-height: 1.7;
}

.not-found-shell {
    min-height: calc(100vh - 16rem);
    display: grid;
    place-items: center;
}

.not-found-inner {
    position: relative;
    z-index: 1;
    max-width: 42rem;
    text-align: center;
}

.not-found-code {
    margin: 0 0 1rem;
    color: var(--accent);
    font-size: clamp(4rem, 12vw, 8.5rem);
    font-weight: 800;
    line-height: 0.9;
    letter-spacing: -0.08em;
}

.not-found-title {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 800;
    letter-spacing: -0.05em;
}

.not-found-description {
    margin: 1rem auto 0;
    max-width: 34rem;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.9;
}

.site-footer {
    padding-top: 3rem;
}

.site-footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.5rem 1.75rem;
    border-radius: 1.6rem;
}

.footer-copy {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem 1.1rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-weight: 600;
    text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
    color: var(--text-primary);
}

.bd-mode-toggle {
    z-index: 1031;
}

.bd-mode-toggle .btn-bd-primary {
    border: 1px solid var(--surface-border);
    border-radius: 999px;
    background: var(--surface-strong);
    color: var(--text-primary);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(16px);
}

.bd-mode-toggle .dropdown-menu {
    border: 1px solid var(--surface-border);
    border-radius: 1rem;
    background: var(--surface-strong);
    backdrop-filter: blur(18px);
}

.bd-mode-toggle .dropdown-item {
    color: var(--text-primary);
}

.bd-mode-toggle .dropdown-item.active,
.bd-mode-toggle .dropdown-item:active {
    background: var(--accent-soft);
    color: var(--text-primary);
}

@media (max-width: 991.98px) {
    .site-nav .nav-frame {
        border-radius: 1.5rem;
    }

    .page-header-panel {
        padding: 2.25rem 1.4rem;
    }

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

@media (max-width: 767.98px) {
    .site-shell {
        padding-top: 0.85rem;
    }

    .site-nav {
        top: 0.75rem;
    }

    .site-nav .nav-frame {
        align-items: flex-start;
        flex-direction: column;
    }

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

    .archive-shell,
    .tag-shell,
    .article-shell,
    .site-footer-inner,
    .page-header-panel {
        border-radius: 1.35rem;
    }

    .article-meta-bar {
        align-items: flex-start !important;
        flex-direction: column;
    }
}