:root {
    --bg: #0c0c0e;
    --surface: #141416;
    --surface-elevated: #1a1a1c;
    --text-primary: #e8e6e3;
    --text-secondary: #8a8680;
    --text-muted: #5a5652;
    --accent: #c4a882;
    --accent-dim: #8a7a6a;
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);
    --selection-bg: rgba(196,168,130,0.25);
    --selection-text: #e8e6e3;
}

[data-theme="light"] {
    --bg: #faf9f7;
    --surface: #f0eeeb;
    --surface-elevated: #e8e5e1;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #8a8a8a;
    --accent: #8a6a4a;
    --accent-dim: #a09080;
    --border: rgba(0,0,0,0.08);
    --border-hover: rgba(0,0,0,0.15);
    --selection-bg: rgba(138,106,74,0.2);
    --selection-text: #1a1a1a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

::selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}

::-moz-selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}

body {
    font-family: 'DM Sans', 'Noto Serif SC', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.7;
    font-weight: 300;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    transition: background 0.5s ease, color 0.5s ease;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.014;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.5' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }

/* Navigation */
nav {
    position: fixed;
    top: 0; width: 100%;
    padding: 1.2rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: rgba(12,12,14,0.8);
    backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid var(--border);
    transition: background 0.5s ease, border-color 0.5s ease;
}

[data-theme="light"] nav {
    background: rgba(250,249,247,0.85);
}

.logo {
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.5s ease;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.theme-toggle svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
    display: none;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
    text-align: center;
    transition: border-color 0.5s ease;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
}

/* Reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--surface);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 50;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    border-color: var(--border-hover);
    color: var(--accent);
}

.back-to-top svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* =====================
   Homepage
   ===================== */
.hero {
    position: relative;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 2rem 3rem;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.hero.hidden {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
}

.hero h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 300;
    letter-spacing: 0.1em;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero .tagline {
    font-size: clamp(0.85rem, 1.3vw, 1rem);
    color: var(--text-secondary);
    max-width: 480px;
    letter-spacing: 0.05em;
}

.hero-meta {
    margin-top: 1.5rem;
    display: flex;
    gap: 2rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.hero-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.hero-meta .dot {
    width: 4px; height: 4px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.6;
}

.home-section {
    padding: 3rem 2rem 5rem;
    max-width: 800px;
    margin: 0 auto;
}

.section-label {
    font-size: 0.7rem;
    letter-spacing: 0.25em;
    color: var(--accent-dim);
    text-transform: uppercase;
    margin-bottom: 2.5rem;
    display: block;
    text-align: center;
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.article-item {
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border);
    transition: all 0.4s ease;
    cursor: pointer;
    position: relative;
}

.article-item:first-child {
    border-top: 1px solid var(--border);
}

.article-item::before {
    content: '';
    position: absolute;
    left: -1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 0;
    background: var(--accent);
    transition: height 0.3s ease;
    opacity: 0.5;
}

.article-item:hover::before {
    height: 60%;
}

.article-item:hover .article-title {
    color: var(--accent);
}

.article-item a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.6rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.article-meta .category {
    color: var(--accent-dim);
    border: 1px solid var(--border);
    padding: 0.15rem 0.5rem;
    border-radius: 2px;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
}

.article-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    transition: color 0.3s ease;
    line-height: 1.4;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.8;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-footer {
    margin-top: 1rem;
    display: flex;
    gap: 1.5rem;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.article-footer span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.pagination a, .pagination button {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pagination a:hover, .pagination button:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.pagination .current {
    color: var(--accent);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
}

.pagination .disabled {
    opacity: 0.3;
    pointer-events: none;
}


/* =====================
   Article page
   ===================== */
.reading-progress {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 2px;
    background: transparent;
    z-index: 101;
}

.reading-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-dim), var(--accent));
    transition: width 0.1s linear;
}

.article-header {
    max-width: 720px;
    margin: 0 auto;
    padding: 10rem 2rem 3rem;
    text-align: center;
}

.article-meta-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.article-meta-top .category {
    color: var(--accent-dim);
    border: 1px solid var(--border);
    padding: 0.2rem 0.6rem;
    border-radius: 2px;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
}

.article-page-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 400;
    line-height: 1.4;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.article-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 560px;
    margin: 0 auto 2rem;
}

.article-meta-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--border);
    transition: border-color 0.5s ease;
}

.article-meta-bottom span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.article-meta-bottom .dot {
    width: 3px; height: 3px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.5;
}

.article-body {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 2rem 6rem;
}

.article-body p {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: justify;
}

.article-body p strong {
    color: var(--text-primary);
    font-weight: 400;
}

.article-body h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-primary);
    margin: 4rem 0 1.5rem;
    letter-spacing: 0.05em;
    line-height: 1.4;
}

.article-body h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-primary);
    margin: 3rem 0 1rem;
    letter-spacing: 0.05em;
}

.article-body blockquote {
    margin: 3rem 0;
    padding: 2rem 2.5rem;
    border-left: 2px solid var(--accent);
    background: var(--surface);
    position: relative;
    transition: background 0.5s ease, border-color 0.5s ease;
}

.article-body blockquote::before {
    content: '"';
    font-family: 'Noto Serif SC', serif;
    font-size: 3rem;
    color: var(--accent);
    opacity: 0.3;
    position: absolute;
    top: 0.5rem;
    left: 1rem;
    line-height: 1;
}

.article-body blockquote p {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-style: italic;
}

.article-body blockquote cite {
    font-family: 'DM Sans', sans-serif;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: normal;
    letter-spacing: 0.1em;
}

.article-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 4rem auto;
    width: 60px;
    transition: border-color 0.5s ease;
}

.article-body ul, .article-body ol {
    margin: 2rem 0;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.article-body li {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    line-height: 2;
    margin-bottom: 0.8rem;
    position: relative;
}

.article-body ul li::marker {
    color: var(--accent-dim);
}

.article-body a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent-dim);
    transition: border-color 0.3s ease, color 0.3s ease;
}

.article-body a:hover {
    border-color: var(--accent);
}

.article-body code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85em;
    background: var(--surface);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    color: var(--accent);
    border: 1px solid var(--border);
    transition: background 0.5s ease, border-color 0.5s ease;
}

.article-body pre {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1.5rem;
    overflow-x: auto;
    margin: 2rem 0;
    transition: background 0.5s ease, border-color 0.5s ease;
}

.article-body pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.8;
}

.article-body img {
    width: 100%;
    border-radius: 4px;
    margin: 2.5rem 0;
    border: 1px solid var(--border);
    transition: border-color 0.5s ease;
}

.article-body figcaption {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: -1.5rem;
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
}

.footnotes {
    max-width: 680px;
    margin: 0 auto;
    padding: 3rem 2rem;
    border-top: 1px solid var(--border);
    transition: border-color 0.5s ease;
}

.footnotes h4 {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.footnotes ol {
    padding-left: 1.2rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.8;
}

.footnotes li {
    margin-bottom: 0.5rem;
}

.footnotes a {
    color: var(--accent-dim);
    text-decoration: none;
}

.article-footer-section {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 2rem 6rem;
}

.tags {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.tags a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    border: 1px solid var(--border);
    padding: 0.4rem 1rem;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.tags a:hover {
    border-color: var(--border-hover);
    color: var(--text-secondary);
}

.author-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2.5rem;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    margin-bottom: 3rem;
    transition: background 0.5s ease, border-color 0.5s ease;
}

.author-avatar {
    width: 60px; height: 60px;
    border-radius: 50%;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Noto Serif SC', serif;
    font-size: 1.2rem;
    color: var(--accent);
    flex-shrink: 0;
    transition: background 0.5s ease, border-color 0.5s ease;
}

.author-info h4 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.author-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    border-top: 1px solid var(--border);
    padding-top: 2rem;
    transition: border-color 0.5s ease;
}

.post-nav a {
    text-decoration: none;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: all 0.3s ease;
    display: block;
}

.post-nav a:hover {
    border-color: var(--border-hover);
    background: var(--surface);
}

.post-nav .nav-label {
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.8rem;
    display: block;
}

.post-nav .nav-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.post-nav .next {
    text-align: right;
}

.article-back-to-top {
    text-align: center;
    padding: 2rem 0;
}

.article-back-to-top a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    transition: color 0.3s ease;
}

.article-back-to-top a:hover {
    color: var(--accent);
}


/* =====================
   About page
   ===================== */
.about-container {
    max-width: 680px;
    margin: 0 auto;
    padding: 10rem 2rem 6rem;
    text-align: center;
}

.about-avatar {
    width: 100px; height: 100px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    margin: 0 auto 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Noto Serif SC', serif;
    font-size: 2rem;
    color: var(--accent);
    transition: background 0.5s ease, border-color 0.5s ease;
}

.about-name {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.8rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.about-tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    margin-bottom: 3rem;
}

.about-divider {
    width: 60px;
    height: 1px;
    background: var(--border);
    margin: 0 auto 3rem;
    transition: background 0.5s ease;
}

.about-content {
    text-align: left;
}

.about-content p {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: justify;
}

.about-content p strong {
    color: var(--text-primary);
    font-weight: 400;
}

.about-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border);
    transition: border-color 0.5s ease;
}

.about-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    transition: color 0.3s ease;
    position: relative;
}

.about-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.about-links a:hover {
    color: var(--text-primary);
}

.about-links a:hover::after {
    width: 100%;
}

/* =====================
   404 page
   ===================== */
.not-found {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.not-found h1 {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(4rem, 15vw, 10rem);
    font-weight: 300;
    color: var(--accent);
    letter-spacing: 0.1em;
    line-height: 1;
    margin-bottom: 1.5rem;
}

.not-found p {
    color: var(--text-secondary);
    font-size: 1rem;
    letter-spacing: 0.05em;
    margin-bottom: 3rem;
}

.not-found a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    border-bottom: 1px solid var(--accent-dim);
    padding-bottom: 0.2rem;
    transition: border-color 0.3s ease;
}

.not-found a:hover {
    border-color: var(--accent);
}

/* =====================
   Responsive
   ===================== */
@media (max-width: 768px) {
    nav { padding: 1rem 1.5rem; }
    .nav-right { gap: 1.5rem; }
    .nav-links { gap: 1.5rem; }

    .hero { min-height: 40vh; padding: 6rem 1.5rem 2rem; }
    .home-section { padding: 2rem 1.5rem 4rem; }
    .article-item { padding: 2rem 0; }
    .article-item::before { left: -0.5rem; }

    .article-header { padding: 7rem 1.5rem 2rem; }
    .article-body { padding: 0 1.5rem 4rem; }
    .article-body p { font-size: 1rem; line-height: 1.9; }
    .author-card { flex-direction: column; align-items: center; text-align: center; }
    .post-nav { grid-template-columns: 1fr; }
    .post-nav .next { text-align: left; }

    .about-container { padding: 7rem 1.5rem 4rem; }
    .about-content p { font-size: 1rem; line-height: 1.9; }

    .back-to-top { bottom: 1.5rem; right: 1.5rem; }
}