:root {
    --bg: #ffffff;
    --card: #ffffff;
    --card-soft: #ffffff;
    --ink: #0f172a;
    --muted: #64748b;
    --line: #e5e7eb;
    --blue: #2563eb;
    --blue-dark: #1e40af;
    --blue-soft: #eff6ff;
    --sky: #0284c7;
    --shadow: 0 10px 30px rgba(0, 0, 0, .05);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: #ffffff;
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.75;
}

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

.eb-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, .96);
    backdrop-filter: blur(18px);
}

.eb-header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.eb-logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--ink);
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    font-size: 14px;
}

.eb-logo-mark {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    color: #fff;
    background: linear-gradient(135deg, var(--blue), var(--sky));
    box-shadow: 0 8px 20px rgba(37, 99, 235, .18);
    font-family: "Noto Serif SC", Georgia, serif;
    font-size: 21px;
}

.eb-menu {
    display: flex;
    gap: 22px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
}

.eb-menu a:hover {
    color: var(--blue);
}

.eb-wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 46px 24px 20px;
}

.eb-hero {
    max-width: 920px;
    padding: 56px 0 44px;
    border-bottom: 1px solid var(--line);
}

.eb-kicker {
    color: var(--blue);
    font-weight: 800;
    letter-spacing: .16em;
    text-transform: uppercase;
    font-size: 12px;
    margin-bottom: 16px;
}

.eb-hero h1 {
    margin: 0;
    color: var(--ink);
    font-family: "Noto Serif SC", Georgia, serif;
    font-size: clamp(42px, 7vw, 76px);
    line-height: 1.02;
    letter-spacing: -.055em;
}

.eb-lead {
    max-width: 760px;
    margin: 24px 0 0;
    color: #334155;
    font-size: clamp(18px, 2vw, 22px);
}

.eb-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin-top: 24px;
    color: var(--muted);
    font-size: 14px;
}

.eb-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 310px;
    gap: 44px;
    align-items: start;
    margin-top: 38px;
}

.eb-article {
    min-width: 0;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 28px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.eb-note {
    margin: 30px 34px 0;
    padding: 15px 17px;
    border-radius: 18px;
    color: var(--blue-dark);
    background: #f8fafc;
    border: 1px solid #dbeafe;
    font-size: 14px;
}

.eb-content {
    padding: 34px;
    font-size: 18px;
    color: #111827;
}

.eb-content h1,
.eb-content h2,
.eb-content h3 {
    color: var(--ink);
    font-family: "Noto Serif SC", Georgia, serif;
    line-height: 1.22;
    letter-spacing: -.025em;
}

.eb-content h1 {
    font-size: 40px;
}

.eb-content h2 {
    margin-top: 42px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
    font-size: 32px;
    scroll-margin-top: 110px;
}

.eb-content h3 {
    margin-top: 28px;
    color: var(--blue-dark);
    font-size: 24px;
    scroll-margin-top: 110px;
}

.eb-content p {
    margin: 17px 0;
}

.eb-content ul,
.eb-content ol {
    padding-left: 1.45em;
}

.eb-content li {
    margin: 9px 0;
}

.eb-content blockquote {
    margin: 30px 0;
    padding: 20px 22px;
    color: #1e3a8a;
    background: #f8fafc;
    border-left: 5px solid var(--blue);
    border-radius: 0 18px 18px 0;
}

.eb-content code {
    padding: 3px 7px;
    border-radius: 7px;
    background: #f1f5f9;
    color: #075985;
    font-size: .92em;
}

.eb-content a {
    color: var(--blue);
    border-bottom: 1px solid rgba(37, 99, 235, .35);
}

.eb-post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    padding: 0 34px 34px;
}

.eb-nav-card {
    min-height: 112px;
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #ffffff;
    transition: transform .2s ease, box-shadow .2s ease;
}

.eb-nav-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, .06);
}

.eb-nav-card small {
    display: block;
    margin-bottom: 9px;
    color: var(--blue);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .12em;
}

.eb-nav-card strong {
    display: block;
    color: var(--ink);
    line-height: 1.45;
}

.eb-next {
    text-align: right;
}

.eb-disabled {
    opacity: .55;
}

.eb-sidebar {
    display: flex;
    flex-direction: column;
    gap: 18px;
    position: sticky;
    top: 98px;
}

.eb-side-card {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: #ffffff;
    box-shadow: var(--shadow);
}

.eb-side-card h3 {
    margin: 0 0 12px;
    color: var(--ink);
    font-family: "Noto Serif SC", Georgia, serif;
    font-size: 24px;
    line-height: 1.2;
}

.eb-side-card p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

.eb-avatar {
    width: 54px;
    height: 54px;
    display: grid;
    place-items: center;
    margin-bottom: 14px;
    border-radius: 18px;
    color: #fff;
    background: linear-gradient(135deg, var(--blue), var(--sky));
    font-family: "Noto Serif SC", Georgia, serif;
    font-size: 28px;
}

.eb-footer {
    max-width: 1180px;
    margin: 36px auto 44px;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 940px) {
    .eb-grid {
        grid-template-columns: 1fr;
    }

    .eb-sidebar {
        position: static;
        order: -1;
    }
}

@media (max-width: 680px) {
    .eb-header-inner,
    .eb-footer {
        align-items: flex-start;
        flex-direction: column;
    }

    .eb-menu {
        width: 100%;
        overflow-x: auto;
    }

    .eb-wrap {
        padding-left: 16px;
        padding-right: 16px;
    }

    .eb-hero {
        padding-top: 36px;
    }

    .eb-content,
    .eb-note,
    .eb-post-nav {
        margin-left: 0;
        margin-right: 0;
        padding-left: 22px;
        padding-right: 22px;
    }

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

    .eb-next {
        text-align: left;
    }
}