:root {
    --blue: #0057ff;
    --blue-dark: #003bb3;
    --blue-soft: #eaf2ff;
    --white: #ffffff;
    --text: #102033;
    --muted: #5d6b7c;
    --border: #d9e6f7;
    --bg: #f7fbff;
    --card: #ffffff;
    --shadow: 0 18px 45px rgba(0, 63, 140, 0.12);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(0, 87, 255, 0.10), transparent 32rem),
        linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
    color: var(--text);
    line-height: 1.65;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 16px 5vw;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(217, 230, 247, 0.9);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    letter-spacing: 0.03em;
    color: var(--blue-dark);
}

.brand img {
    width: 38px;
    height: 38px;
    object-fit: contain;
}

.nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.nav a {
    padding: 9px 13px;
    border-radius: 999px;
    color: var(--muted);
    font-weight: 700;
    font-size: 0.94rem;
    transition: all 0.2s ease;
}

.nav a:hover,
.nav a.active {
    color: var(--blue-dark);
    background: var(--blue-soft);
}

.nav .nav-cta {
    background: var(--blue);
    color: var(--white);
    box-shadow: 0 10px 24px rgba(0, 87, 255, 0.24);
}

.nav .nav-cta:hover {
    background: var(--blue-dark);
    color: var(--white);
}

.blog-hero {
    padding: 82px 5vw 46px;
}

.blog-hero-inner {
    max-width: 1040px;
    margin: 0 auto;
    padding: 56px;
    border-radius: var(--radius-xl);
    background:
        linear-gradient(135deg, rgba(0, 87, 255, 0.10), rgba(255, 255, 255, 0.95)),
        var(--white);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.eyebrow {
    display: inline-flex;
    margin: 0 0 16px;
    padding: 7px 13px;
    border-radius: 999px;
    background: var(--blue-soft);
    color: var(--blue-dark);
    font-size: 0.83rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.blog-hero h1 {
    max-width: 880px;
    margin: 0;
    font-size: clamp(2.2rem, 5vw, 4.9rem);
    line-height: 0.97;
    letter-spacing: -0.065em;
    color: var(--text);
}

.hero-text {
    max-width: 720px;
    margin: 24px 0 0;
    font-size: clamp(1.05rem, 2vw, 1.28rem);
    color: var(--muted);
}

.blog-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 28px;
    width: min(1180px, 90vw);
    margin: 0 auto 72px;
}

.posts-grid {
    display: grid;
    gap: 22px;
}

.post-card {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 0;
    overflow: hidden;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 32px rgba(0, 63, 140, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.post-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.post-image-link {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, var(--blue-soft), #ffffff);
    padding: 34px;
    border-right: 1px solid var(--border);
}

.post-image-link img {
    max-width: 130px;
    max-height: 130px;
    object-fit: contain;
    filter: drop-shadow(0 10px 18px rgba(0, 87, 255, 0.16));
}

.post-card-body {
    padding: 28px;
}

.post-meta,
.article-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
    color: var(--blue-dark);
    font-size: 0.84rem;
    font-weight: 800;
}

.post-card h2 {
    margin: 0 0 10px;
    font-size: clamp(1.35rem, 2vw, 2rem);
    line-height: 1.12;
    letter-spacing: -0.035em;
}

.post-card h2 a:hover,
.related-card h3 a:hover {
    color: var(--blue);
}

.post-card p {
    margin: 0 0 18px;
    color: var(--muted);
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--blue);
    font-weight: 900;
}

.read-more span {
    transition: transform 0.2s ease;
}

.read-more:hover span {
    transform: translateX(4px);
}

.blog-sidebar {
    display: grid;
    align-content: start;
    gap: 18px;
}

.sidebar-card,
.empty-state {
    padding: 26px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 32px rgba(0, 63, 140, 0.08);
}

.sidebar-card h2,
.empty-state h2 {
    margin: 0 0 10px;
    font-size: 1.2rem;
    letter-spacing: -0.025em;
}

.sidebar-card p {
    margin: 0 0 18px;
    color: var(--muted);
}

.sidebar-button,
.primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 11px 18px;
    border-radius: 999px;
    background: var(--blue);
    color: var(--white);
    font-weight: 900;
    box-shadow: 0 12px 28px rgba(0, 87, 255, 0.24);
    transition: all 0.2s ease;
}

.sidebar-button:hover,
.primary-button:hover {
    background: var(--blue-dark);
    transform: translateY(-1px);
}

.topic-list {
    display: grid;
    gap: 10px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.topic-list li {
    padding: 10px 12px;
    border-radius: 12px;
    background: var(--blue-soft);
    color: var(--blue-dark);
    font-weight: 800;
}

.article {
    width: min(860px, 90vw);
    margin: 56px auto 46px;
}

.article-header {
    text-align: left;
}

.back-link {
    display: inline-flex;
    margin-bottom: 24px;
    color: var(--blue);
    font-weight: 900;
}

.article-header h1 {
    margin: 0;
    font-size: clamp(2.25rem, 5vw, 4.8rem);
    line-height: 0.97;
    letter-spacing: -0.065em;
}

.article-excerpt {
    max-width: 760px;
    margin: 24px 0 0;
    color: var(--muted);
    font-size: 1.22rem;
}

.article-hero-image {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 38px 0;
    min-height: 240px;
    padding: 48px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    background:
        radial-gradient(circle at center, rgba(0, 87, 255, 0.12), transparent 18rem),
        linear-gradient(135deg, #ffffff, var(--blue-soft));
    box-shadow: var(--shadow);
}

.article-hero-image img {
    width: min(220px, 60vw);
    object-fit: contain;
    filter: drop-shadow(0 18px 30px rgba(0, 87, 255, 0.20));
}

.article-content {
    padding: 10px 0 0;
    font-size: 1.1rem;
}

.article-content h2 {
    margin: 42px 0 12px;
    font-size: clamp(1.55rem, 3vw, 2.2rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.article-content p {
    margin: 0 0 20px;
    color: #25364a;
}

.article-content strong {
    color: var(--blue-dark);
}

.article-cta {
    margin-top: 48px;
    padding: 34px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    color: var(--white);
    box-shadow: var(--shadow);
}

.article-cta h2 {
    margin: 0 0 10px;
    font-size: clamp(1.6rem, 3vw, 2.35rem);
    letter-spacing: -0.04em;
    line-height: 1.05;
}

.article-cta p {
    margin: 0 0 22px;
    color: rgba(255, 255, 255, 0.88);
}

.article-cta .primary-button {
    background: var(--white);
    color: var(--blue-dark);
    box-shadow: none;
}

.related-section {
    width: min(1180px, 90vw);
    margin: 0 auto 72px;
}

.related-section > h2 {
    margin: 0 0 18px;
    font-size: clamp(1.7rem, 3vw, 2.4rem);
    letter-spacing: -0.045em;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.related-card {
    padding: 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--white);
    box-shadow: 0 12px 32px rgba(0, 63, 140, 0.08);
}

.related-card h3 {
    margin: 0 0 10px;
    font-size: 1.25rem;
    line-height: 1.18;
    letter-spacing: -0.03em;
}

.related-card p {
    margin: 0;
    color: var(--muted);
}

.not-found {
    width: min(760px, 90vw);
    margin: 90px auto;
    padding: 48px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    background: var(--white);
    box-shadow: var(--shadow);
    text-align: center;
}

.not-found h1 {
    margin: 0 0 12px;
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: -0.05em;
}

.not-found p {
    margin: 0 0 24px;
    color: var(--muted);
}

.site-footer {
    padding: 30px 5vw;
    border-top: 1px solid var(--border);
    color: var(--muted);
    text-align: center;
}

.site-footer p {
    margin: 0;
}

@media (max-width: 940px) {
    .site-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .blog-layout {
        grid-template-columns: 1fr;
    }

    .blog-sidebar {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .post-card {
        grid-template-columns: 160px minmax(0, 1fr);
    }

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

@media (max-width: 680px) {
    .site-header {
        padding: 14px 18px;
    }

    .nav {
        width: 100%;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 4px;
    }

    .nav a {
        white-space: nowrap;
    }

    .blog-hero {
        padding: 36px 18px 24px;
    }

    .blog-hero-inner {
        padding: 30px 24px;
    }

    .blog-layout,
    .article,
    .related-section {
        width: calc(100vw - 36px);
    }

    .post-card {
        grid-template-columns: 1fr;
    }

    .post-image-link {
        border-right: 0;
        border-bottom: 1px solid var(--border);
        min-height: 170px;
    }

    .post-card-body {
        padding: 24px;
    }

    .blog-sidebar {
        grid-template-columns: 1fr;
    }

    .article {
        margin-top: 34px;
    }

    .article-hero-image {
        min-height: 190px;
        padding: 34px;
    }

    .article-cta {
        padding: 26px;
    }
}

.language-filter {
    width: min(1180px, 90vw);
    margin: 0 auto 28px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.language-filter a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: 999px;
    background: #ffffff;
    border: 1px solid var(--border);
    color: var(--blue-dark);
    font-weight: 900;
    box-shadow: 0 8px 20px rgba(0, 63, 140, 0.06);
}

.language-filter a.active {
    background: var(--blue);
    color: #ffffff;
    border-color: var(--blue);
}