:root {
    --bg: #f7f9fc;
    --bg-soft: #eef3f8;
    --panel: #ffffff;
    --panel-elevated: rgba(255, 255, 255, 0.78);
    --text: #111827;
    --heading: #111827;
    --muted: #475467;
    --muted-strong: #344054;
    --border: rgba(15, 23, 42, 0.11);
    --shadow: 0 24px 70px rgba(15, 23, 42, 0.10);
    --shadow-soft: 0 14px 34px rgba(15, 23, 42, 0.08);
    --accent: #9b2d20;
    --accent-hover: #b23c2b;
    --accent-soft: rgba(155, 45, 32, 0.10);
    --accent-glow: rgba(155, 45, 32, 0.20);
    --gold: #d4a562;
    --radius-lg: 24px;
    --radius-md: 18px;
    --nav-height: 72px;
}

:root[data-accent="blue"] {
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: rgba(37, 99, 235, 0.11);
    --accent-glow: rgba(37, 99, 235, 0.22);
}

:root[data-accent="gold"] {
    --accent: #b7791f;
    --accent-hover: #975a16;
    --accent-soft: rgba(183, 121, 31, 0.13);
    --accent-glow: rgba(212, 165, 98, 0.26);
}

:root[data-theme="dark"] {
    --bg: #0b1120;
    --bg-soft: #111827;
    --panel: #111827;
    --panel-elevated: rgba(17, 24, 39, 0.72);
    --text: #f3f4f6;
    --heading: #f9fafb;
    --muted: #cbd5e1;
    --muted-strong: #e2e8f0;
    --border: rgba(148, 163, 184, 0.22);
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.40);
    --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.32);
    --accent: #f0a89d;
    --accent-hover: #ffc4ba;
    --accent-soft: rgba(240, 168, 157, 0.12);
    --accent-glow: rgba(240, 168, 157, 0.22);
}

:root[data-theme="dark"][data-accent="blue"] {
    --accent: #93c5fd;
    --accent-hover: #bfdbfe;
    --accent-soft: rgba(147, 197, 253, 0.13);
    --accent-glow: rgba(96, 165, 250, 0.24);
}

:root[data-theme="dark"][data-accent="gold"] {
    --accent: #e4b976;
    --accent-hover: #f4d49e;
    --accent-soft: rgba(228, 185, 118, 0.14);
    --accent-glow: rgba(228, 185, 118, 0.24);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--text);
    background: linear-gradient(180deg, var(--bg), var(--bg-soft));
    background-attachment: fixed;
    font-family: Inter, "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.58;
    -webkit-font-smoothing: antialiased;
}

body::after,
body::before {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    content: "";
}

body::after {
    background:
        radial-gradient(circle at 8% 4%, var(--accent-glow), transparent 30rem),
        radial-gradient(circle at 88% 12%, rgba(212, 165, 98, 0.16), transparent 24rem),
        radial-gradient(circle at 78% 78%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 28rem);
}

body::before {
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.055) 1px, transparent 1px);
    background-size: 46px 46px;
    mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 72%);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

a:hover {
    color: var(--accent-hover);
}

.lang-zh {
    display: none !important;
}

:root[data-locale="zh"] .lang-en {
    display: none !important;
}

:root[data-locale="zh"] .lang-zh {
    display: revert !important;
}

.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--panel) 68%, transparent);
    backdrop-filter: blur(24px) saturate(1.25);
    -webkit-backdrop-filter: blur(24px) saturate(1.25);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(1180px, calc(100% - 40px));
    min-height: var(--nav-height);
    margin: 0 auto;
    gap: 1rem;
}

.brand {
    display: inline-flex;
    align-items: baseline;
    gap: 0.4rem;
    color: var(--heading);
    font-weight: 800;
    letter-spacing: -0.04em;
    white-space: nowrap;
}

.brand span:first-child {
    font-size: 1.08rem;
}

.brand span:last-child {
    color: var(--accent);
    font-size: 0.86rem;
    letter-spacing: 0;
}

.nav-links,
.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    flex: 1;
    justify-content: center;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 0.46rem 0.72rem;
    color: var(--muted-strong);
    font-size: 0.88rem;
    font-weight: 700;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
    background: var(--accent-soft);
}

.segmented,
.control-button {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--panel) 82%, transparent);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.segmented button,
.control-button {
    min-height: 36px;
    color: var(--muted-strong);
    font: inherit;
    font-size: 0.8rem;
    font-weight: 800;
    cursor: pointer;
}

.segmented button {
    border: 0;
    border-radius: 999px;
    background: transparent;
    padding: 0 0.62rem;
}

.segmented button.active {
    color: #fff;
    background: var(--accent);
}

.control-button {
    gap: 0.44rem;
    padding: 0 0.72rem;
}

.control-button:hover {
    color: var(--accent);
    border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
    transform: translateY(-1px);
}

.site-shell {
    position: relative;
    z-index: 1;
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    padding: 2.25rem 0 3rem;
}

.log-shell {
    width: min(880px, calc(100% - 40px));
    padding-top: 3rem;
}

.log-hero {
    padding: 0 0 1.4rem;
}

.log-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    margin-bottom: 1.1rem;
    border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--border));
    border-radius: 0.9rem;
    color: #fff;
    background: linear-gradient(135deg, var(--accent), var(--gold));
    box-shadow: var(--shadow-soft);
    font-size: 1.25rem;
    font-weight: 800;
}

.log-hero h1 {
    margin: 0;
    color: var(--heading);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.055em;
}

.log-intro {
    max-width: 760px;
    margin: 0.85rem 0 0;
    color: var(--muted-strong);
    font-size: 1rem;
    line-height: 1.7;
}

.recent-note {
    display: block;
    margin: 0.9rem 0 1.75rem;
    border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--border));
    border-radius: var(--radius-md);
    padding: 0.95rem 1rem;
    color: var(--text);
    background: color-mix(in srgb, var(--panel-elevated) 88%, transparent);
    box-shadow: var(--shadow-soft);
}

.recent-note:hover {
    border-color: color-mix(in srgb, var(--accent) 48%, var(--border));
    transform: translateY(-1px);
}

.recent-label {
    display: inline-flex;
    margin-right: 0.5rem;
    border-radius: 999px;
    padding: 0.2rem 0.5rem;
    color: var(--accent);
    background: var(--accent-soft);
    font-size: 0.78rem;
    font-weight: 800;
}

.recent-note strong {
    color: var(--heading);
    font-weight: 800;
}

.recent-note em {
    display: block;
    margin-top: 0.25rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.log-section {
    margin-top: 1.75rem;
}

.log-section h2 {
    margin: 0 0 0.72rem;
    color: var(--heading);
    font-size: 1.28rem;
    font-weight: 800;
    letter-spacing: -0.025em;
}

.topic-line {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.topic-line a,
.topic-line span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
    border-radius: 999px;
    padding: 0.38rem 0.68rem;
    color: var(--muted-strong);
    background: var(--accent-soft);
    font-size: 0.88rem;
    font-weight: 700;
}

.topic-line a:hover {
    color: var(--accent);
    border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
    transform: translateY(-1px);
}

.topic-line strong {
    color: var(--accent);
    font-weight: 800;
}

.plain-line {
    margin: 0;
    color: var(--muted-strong);
    line-height: 1.65;
}

.group-title {
    margin-bottom: 0.75rem;
}

.group-title > span {
    display: block;
    margin-bottom: 0.1rem;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.group-title h2 {
    margin-bottom: 0.15rem;
}

.group-title p {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 700;
}

.note-list {
    display: grid;
    gap: 0.9rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.note-card {
    display: grid;
    grid-template-columns: 4.5rem minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    color: var(--text);
    background: color-mix(in srgb, var(--panel-elevated) 88%, transparent);
    box-shadow: var(--shadow-soft), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.note-card:hover {
    border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
    background: color-mix(in srgb, var(--panel) 78%, transparent);
    transform: translateY(-2px);
}

.note-year {
    color: var(--accent);
    font-size: 0.88rem;
    font-weight: 800;
}

.note-main {
    display: grid;
    gap: 0.28rem;
}

.note-main strong {
    color: var(--heading);
    font-size: 1.05rem;
    font-weight: 800;
    line-height: 1.3;
}

.note-main em {
    color: var(--muted);
    font-size: 0.88rem;
    font-style: normal;
}

.note-main span {
    color: var(--muted-strong);
    font-size: 0.92rem;
    line-height: 1.55;
}

.note-arrow {
    color: var(--accent);
    font-size: 1.15rem;
    font-weight: 800;
}

.card {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--panel-elevated);
    box-shadow: var(--shadow-soft), inset 0 1px 0 rgba(255, 255, 255, 0.22);
    backdrop-filter: blur(24px) saturate(1.18);
    -webkit-backdrop-filter: blur(24px) saturate(1.18);
}

.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    overflow: hidden;
    margin-bottom: 1rem;
    padding: clamp(1.15rem, 2.5vw, 1.75rem);
}

.hero h1,
.article-card h1 {
    margin: 0;
    color: var(--heading);
    font-size: clamp(2rem, 4.2vw, 3.5rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.055em;
}

.eyebrow {
    margin: 0 0 0.6rem;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero-copy {
    max-width: 760px;
    margin: 0.75rem 0 0;
    color: var(--muted-strong);
    font-size: clamp(0.98rem, 1.5vw, 1.08rem);
}

.hero-link,
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--border));
    border-radius: 999px;
    padding: 0.72rem 0.95rem;
    color: var(--accent);
    font-weight: 800;
    white-space: nowrap;
}

.hero-link:hover,
.back-link:hover {
    color: #fff;
    background: var(--accent);
    transform: translateY(-1px);
}

.reading-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 1rem;
    align-items: start;
    margin-top: 1rem;
}

.section-card {
    scroll-margin-top: calc(var(--nav-height) + 1.2rem);
    padding: clamp(1rem, 2vw, 1.35rem);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.8rem;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.62rem;
    margin: 0;
    color: var(--heading);
    font-size: clamp(1.08rem, 1.6vw, 1.25rem);
    font-weight: 800;
    letter-spacing: -0.025em;
}

.section-title i {
    color: var(--accent);
}

.section-tag {
    flex: none;
    border-radius: 999px;
    padding: 0.28rem 0.62rem;
    color: var(--accent);
    background: var(--accent-soft);
    font-size: 0.76rem;
    font-weight: 800;
}

.post-card {
    position: relative;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 0.95rem;
    transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.post-card:hover {
    border-color: color-mix(in srgb, var(--accent) 32%, var(--border));
    background: color-mix(in srgb, var(--panel) 78%, transparent);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
    transform: translateY(-2px);
}

.post-date,
.article-meta {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.post-card h3,
.post-card h4 {
    margin: 0;
    color: var(--heading);
    font-size: 1.05rem;
    line-height: 1.28;
}

.post-card h3 a,
.post-card h4 a {
    color: var(--heading);
}

.post-card:hover h3 a,
.post-card:hover h4 a {
    color: var(--accent);
}

.post-card p {
    margin: 0.42rem 0 0;
    color: var(--muted-strong);
    font-size: 0.9rem;
    line-height: 1.48;
}

.tag-row,
.article-meta,
.category-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-row {
    margin-top: 0.85rem;
}

.tag-row span,
.category-list > span,
.category-list a {
    display: inline-flex;
    align-items: center;
    border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
    border-radius: 999px;
    padding: 0.35rem 0.62rem;
    color: var(--muted-strong);
    background: var(--accent-soft);
    font-size: 0.82rem;
    font-weight: 700;
}

.category-list a {
    justify-content: space-between;
    gap: 0.65rem;
    min-width: 132px;
}

.category-list a:hover {
    border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
    color: var(--accent);
    transform: translateY(-1px);
}

.category-list a span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.35rem;
    height: 1.35rem;
    border-radius: 999px;
    color: #fff;
    background: var(--accent);
    font-size: 0.72rem;
}

.category-list {
    align-items: flex-start;
}

.category-board {
    gap: 0.6rem;
}

.post-group + .post-group {
    border-top: 1px solid var(--border);
    margin-top: 1rem;
    padding-top: 1rem;
}

.group-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin: 0 0 0.55rem;
}

.group-heading h3 {
    margin: 0;
    color: var(--heading);
    font-size: 0.98rem;
    font-weight: 800;
}

.group-heading span {
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 800;
}

.paper-card {
    display: grid;
    grid-template-columns: 4.3rem minmax(0, 1fr) auto;
    gap: 0.85rem;
    align-items: start;
}

.post-year {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 0.32rem 0.5rem;
    color: var(--accent);
    background: var(--accent-soft);
    font-size: 0.82rem;
    font-weight: 800;
}

.post-meta {
    color: var(--muted) !important;
    font-size: 0.82rem !important;
    font-weight: 700;
}

.arrow-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
    border-radius: 50%;
    color: var(--accent);
}

.arrow-link:hover {
    color: #fff;
    background: var(--accent);
}

.side-copy {
    margin: 0;
    color: var(--muted-strong);
    font-size: 0.9rem;
    line-height: 1.5;
}

.article-shell {
    width: min(900px, calc(100% - 40px));
}

.article-card {
    padding: clamp(1.2rem, 3vw, 2.2rem);
}

.article-card .back-link {
    margin-bottom: 1.1rem;
}

.article-meta {
    margin: 1rem 0 1.8rem;
}

.article-card section + section {
    border-top: 1px solid var(--border);
    margin-top: 1.5rem;
    padding-top: 1.2rem;
}

.article-card h2 {
    margin: 0 0 0.6rem;
    color: var(--heading);
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

.article-card p,
.article-card li {
    color: var(--muted-strong);
    font-size: 1rem;
}

.article-card p {
    margin: 0 0 0.85rem;
}

.article-card ul {
    margin: 0;
    padding-left: 1.25rem;
}

.article-card li::marker {
    color: var(--accent);
}

.footer {
    margin-top: 1rem;
    padding: 1.5rem 0 0.5rem;
    color: var(--muted);
    font-size: 0.84rem;
    text-align: center;
}

.js .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 520ms ease, transform 520ms ease;
}

.js .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 900px) {
    :root {
        --nav-height: 132px;
    }

    .nav-inner {
        flex-wrap: wrap;
        width: min(100% - 28px, 1180px);
        padding: 0.75rem 0;
        gap: 0.55rem;
    }

    .brand {
        flex: 0 0 100%;
    }

    .nav-controls {
        flex: 0 0 100%;
        justify-content: flex-start;
    }

    .nav-links {
        order: 3;
        flex: 0 0 100%;
        justify-content: flex-start;
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.2rem;
        scrollbar-width: none;
    }

    .nav-links::-webkit-scrollbar {
        display: none;
    }

    .site-shell,
    .article-shell {
        width: min(100% - 28px, 1180px);
    }

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

@media (max-width: 680px) {
    :root {
        --nav-height: 184px;
    }

    body {
        font-size: 14px;
    }

    .brand {
        width: 100%;
    }

    .nav-controls {
        width: 100%;
        justify-content: space-between;
        gap: 0.4rem;
    }

    .nav-links {
        gap: 0.18rem;
    }

    .nav-link {
        padding: 0.4rem 0.58rem;
        font-size: 0.82rem;
    }

    .control-button,
    .segmented {
        flex: 1;
        justify-content: center;
    }

    .segmented button {
        flex: 1;
    }

    .site-shell {
        padding-top: 1.2rem;
    }

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

    .section-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.45rem;
    }

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

    .note-card {
        grid-template-columns: 1fr auto;
        gap: 0.65rem;
    }

    .post-year,
    .note-year {
        grid-column: 1 / -1;
        justify-self: start;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}