/* =========================================================
   风屿一 — 文人水墨 Literati ink
   rice paper · celadon mist · island wash
   ========================================================= */

:root {
  --fy-ink: #1c1a17;
  --fy-ink-soft: #3a3834;
  --fy-paper: #f3efe6;
  --fy-paper-deep: #e8e2d6;
  --fy-celadon: #6b8576;
  --fy-celadon-deep: #4f675b;
  --fy-mist: #dce6df;
  --fy-wash: #c5d4cb;
  --fy-muted: #6a6660;
  --fy-line: color-mix(in srgb, var(--fy-ink) 14%, transparent);
  --fy-line-soft: color-mix(in srgb, var(--fy-ink) 8%, transparent);

  --fy-font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --fy-font-accent: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --fy-font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --fy-font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;

  --fy-measure: 66ch;
  --fy-wrap: min(960px, calc(100% - 2.75rem));
  --fy-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--fy-ink);
  font-family: var(--fy-font-body);
  font-size: 1.05rem;
  line-height: 1.85;
  font-weight: 400;
  background-color: var(--fy-paper);
  background-image:
    radial-gradient(ellipse 90% 55% at 70% 8%, color-mix(in srgb, var(--fy-mist) 70%, transparent), transparent 70%),
    radial-gradient(ellipse 70% 40% at 15% 90%, color-mix(in srgb, var(--fy-wash) 35%, transparent), transparent 65%),
    linear-gradient(180deg, #f6f2ea 0%, var(--fy-paper) 45%, #efe9de 100%);
  background-attachment: fixed;
}

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

a {
  color: var(--fy-celadon-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 0.25s var(--fy-ease);
}

a:hover {
  color: var(--fy-ink);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 1.5px solid var(--fy-celadon);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 1000;
  padding: 0.55rem 0.9rem;
  background: var(--fy-ink);
  color: var(--fy-paper);
}

.skip-link:focus {
  top: 1rem;
}

.wrap {
  width: var(--fy-wrap);
  margin-inline: auto;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Reading progress ---------- */
.reading-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 80;
  width: 100%;
  height: 2px;
  transform-origin: left center;
  transform: scaleX(0);
  background: var(--fy-celadon-deep);
  pointer-events: none;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--fy-paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--fy-line-soft);
  animation: fy-nav-in 0.8s var(--fy-ease) both;
}

@keyframes fy-nav-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--fy-ink);
  text-decoration: none;
  font-family: var(--fy-font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
}

.site-brand img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  opacity: 0.9;
  filter: grayscale(0.35) contrast(0.95);
}

.site-brand__mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--fy-celadon-deep);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--fy-line);
  background: transparent;
  color: var(--fy-ink);
  padding: 0.4rem 0.7rem;
  font: inherit;
  cursor: pointer;
}

.site-nav .menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--fy-ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.site-nav a:hover,
.site-nav .current-menu-item > a,
.site-nav .current_page_item > a {
  color: var(--fy-ink);
}

.header-tools {
  display: flex;
  align-items: center;
}

.search-toggle {
  border: 0;
  background: transparent;
  color: var(--fy-muted);
  cursor: pointer;
  padding: 0.35rem;
}

.search-panel {
  display: none;
  border-top: 1px solid var(--fy-line-soft);
  padding: 0.75rem 0 1rem;
}

.search-panel.is-open {
  display: block;
}

.search-form {
  display: flex;
  gap: 0.5rem;
}

.search-form input[type="search"] {
  flex: 1;
  border: 0;
  border-bottom: 1px solid var(--fy-line);
  border-radius: 0;
  padding: 0.55rem 0;
  background: transparent;
  font: inherit;
  color: var(--fy-ink);
}

.search-form button {
  border: 0;
  background: transparent;
  color: var(--fy-celadon-deep);
  font: inherit;
  cursor: pointer;
  letter-spacing: 0.08em;
}

/* ---------- Hero: ink wash island ---------- */
.hero {
  position: relative;
  min-height: clamp(22rem, 58vh, 34rem);
  padding: clamp(4rem, 11vw, 7.5rem) 0 clamp(3.5rem, 8vw, 5.5rem);
  overflow: hidden;
  isolation: isolate;
}

.hero__wash {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, var(--fy-paper) 0%, color-mix(in srgb, var(--fy-paper) 82%, transparent) 38%, transparent 68%),
    linear-gradient(180deg, color-mix(in srgb, var(--fy-paper) 55%, transparent) 0%, transparent 28%, var(--fy-paper) 92%);
}

.hero__art {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: url("../img/hero-ink-wash.jpg");
  background-repeat: no-repeat;
  background-position: right center;
  background-size: cover;
  opacity: 0.92;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 28rem;
}

.hero__brand {
  position: relative;
  display: inline-block;
  margin: 0 0 1.25rem;
  font-family: var(--fy-font-accent);
  font-size: clamp(3.2rem, 10vw, 5.75rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: 0.18em;
  color: var(--fy-ink);
}

.hero__seal {
  position: absolute;
  right: -0.15em;
  bottom: 0.15em;
  width: 1.6rem;
  height: 1.6rem;
  display: grid;
  place-items: center;
  font-family: var(--fy-font-display);
  font-size: 0.72rem;
  letter-spacing: 0;
  line-height: 1;
  color: #f3efe6;
  background: #8b3a32;
  border: 1px solid color-mix(in srgb, #5c211c 40%, #8b3a32);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, #f3efe6 25%, transparent);
  transform: rotate(-6deg);
}

.hero__lead {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--fy-muted);
  max-width: 18em;
  letter-spacing: 0.04em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  font: inherit;
  letter-spacing: 0.12em;
  text-decoration: none;
  cursor: pointer;
  border: 0;
  background: none;
  padding: 0;
  color: var(--fy-ink);
  transition: color 0.25s var(--fy-ease);
}

.btn::after {
  content: "";
  display: inline-block;
  width: 1.75rem;
  height: 1px;
  margin-left: 0.65rem;
  background: currentColor;
  transform-origin: left;
  transition: width 0.3s var(--fy-ease);
}

.btn:hover {
  color: var(--fy-celadon-deep);
}

.btn:hover::after {
  width: 2.4rem;
}

.btn--ghost {
  color: var(--fy-muted);
}

.btn--ink {
  color: var(--fy-paper);
  background: var(--fy-ink);
  padding: 0.65rem 1.25rem;
  letter-spacing: 0.1em;
}

.btn--ink::after {
  display: none;
}

.btn--ink:hover {
  color: var(--fy-paper);
  background: var(--fy-ink-soft);
}

.btn--outline {
  color: var(--fy-ink);
  border: 1px solid var(--fy-line);
  padding: 0.55rem 1.1rem;
}

.btn--outline::after {
  display: none;
}

.btn--primary {
  font-weight: 500;
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(2.25rem, 5vw, 3.75rem) 0;
}

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--fy-line);
}

.section__title {
  margin: 0;
  font-family: var(--fy-font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.section__more {
  color: var(--fy-muted);
  text-decoration: none;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
}

.section__more:hover {
  color: var(--fy-celadon-deep);
}

/* ---------- Post list ---------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list__item {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--fy-line-soft);
  animation: fy-fade-up 0.7s var(--fy-ease) both;
}

.post-list__item:nth-child(2) { animation-delay: 0.07s; }
.post-list__item:nth-child(3) { animation-delay: 0.14s; }
.post-list__item:nth-child(4) { animation-delay: 0.21s; }
.post-list__item:nth-child(5) { animation-delay: 0.28s; }

@keyframes fy-fade-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .reading-progress {
    display: none;
  }
}

.post-list__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.1rem;
  margin-bottom: 0.45rem;
  color: var(--fy-muted);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
}

.cat-list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.cat-list a {
  color: var(--fy-celadon-deep);
  text-decoration: none;
}

.post-list__title {
  margin: 0 0 0.45rem;
  font-family: var(--fy-font-display);
  font-size: clamp(1.2rem, 2.2vw, 1.45rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.45;
}

.post-list__title a {
  color: var(--fy-ink);
  text-decoration: none;
}

.post-list__title a:hover {
  color: var(--fy-celadon-deep);
}

.post-list__excerpt {
  margin: 0;
  color: var(--fy-muted);
  max-width: var(--fy-measure);
  font-size: 0.98rem;
}

/* ---------- Projects ---------- */
.project-list {
  border-top: 0;
}

.project {
  display: grid;
  gap: 0.55rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--fy-line-soft);
}

.project--featured .project__title {
  font-size: clamp(1.35rem, 2.8vw, 1.7rem);
}

.project__title {
  margin: 0;
  font-family: var(--fy-font-display);
  font-size: 1.25rem;
  letter-spacing: 0.06em;
}

.project__summary {
  margin: 0;
  max-width: 42ch;
  color: var(--fy-ink-soft);
}

.project__stack {
  margin: 0;
  color: var(--fy-muted);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}

.project__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 0.35rem;
}

.project__actions a {
  text-decoration: none;
  letter-spacing: 0.08em;
  font-size: 0.92rem;
}

/* ---------- Page shell ---------- */
.page-shell {
  padding: clamp(2.5rem, 5vw, 4rem) 0 clamp(3.5rem, 7vw, 5.5rem);
}

.page-intro {
  margin-bottom: 2.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--fy-line);
}

.page-intro h1 {
  margin: 0 0 0.55rem;
  font-family: var(--fy-font-accent);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 400;
  letter-spacing: 0.16em;
}

.page-intro p {
  margin: 0;
  color: var(--fy-muted);
  max-width: 28ch;
  letter-spacing: 0.04em;
}

.layout-blog {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 3.5rem;
}

.sidebar {
  font-size: 0.9rem;
}

.sidebar__block + .sidebar__block {
  margin-top: 2rem;
}

.sidebar h2 {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--fy-muted);
  font-family: var(--fy-font-body);
  font-weight: 500;
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar li + li {
  margin-top: 0.4rem;
}

.sidebar a {
  text-decoration: none;
  color: var(--fy-ink-soft);
}

.sidebar a:hover {
  color: var(--fy-celadon-deep);
}

/* ---------- Single ---------- */
.single-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 170px;
  gap: 2.75rem;
  align-items: start;
}

.entry-header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--fy-line);
}

.entry-header h1 {
  margin: 0.5rem 0 0;
  font-family: var(--fy-font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.35;
  letter-spacing: 0.04em;
  max-width: 16em;
  font-weight: 600;
}

.entry-content {
  max-width: var(--fy-measure);
}

.entry-content > *:first-child {
  margin-top: 0;
}

.entry-content h2,
.entry-content h3 {
  font-family: var(--fy-font-display);
  letter-spacing: 0.04em;
  line-height: 1.35;
  margin-top: 2.4em;
  margin-bottom: 0.65em;
  font-weight: 600;
}

.entry-content h2 {
  font-size: 1.35rem;
}

.entry-content h3 {
  font-size: 1.15rem;
}

.entry-content p,
.entry-content ul,
.entry-content ol {
  margin: 0 0 1.2em;
}

.entry-content blockquote {
  margin: 1.75em 0;
  padding: 0.15em 0 0.15em 1em;
  border-left: 1px solid var(--fy-celadon);
  color: var(--fy-ink-soft);
  font-family: var(--fy-font-display);
}

.entry-content pre {
  overflow-x: auto;
  padding: 1rem 1.1rem;
  background: #2a2926;
  color: #efe9de;
  font-family: var(--fy-font-mono);
  font-size: 0.88rem;
  line-height: 1.55;
}

.entry-content code {
  font-family: var(--fy-font-mono);
  font-size: 0.9em;
}

.entry-content :not(pre) > code {
  padding: 0.1em 0.3em;
  background: var(--fy-paper-deep);
}

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95rem;
}

.entry-content th,
.entry-content td {
  border-bottom: 1px solid var(--fy-line);
  padding: 0.55rem 0.4rem;
  text-align: left;
}

.toc {
  position: sticky;
  top: 5rem;
  font-size: 0.84rem;
}

.toc h2 {
  margin: 0 0 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--fy-muted);
  font-family: var(--fy-font-body);
  font-weight: 500;
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc li {
  margin: 0.4rem 0;
}

.toc a {
  color: var(--fy-muted);
  text-decoration: none;
}

.toc a:hover {
  color: var(--fy-celadon-deep);
}

.toc .toc-h3 {
  padding-left: 0.7rem;
}

.toc-mobile {
  display: none;
  margin-bottom: 1.5rem;
  border-top: 1px solid var(--fy-line);
  border-bottom: 1px solid var(--fy-line);
}

.toc-mobile summary {
  cursor: pointer;
  padding: 0.85rem 0;
  letter-spacing: 0.1em;
}

.toc-mobile .toc {
  position: static;
  padding: 0 0 1rem;
}

.download-box {
  margin: 2.5rem 0;
  padding: 1.25rem 0;
  border-top: 1px solid var(--fy-line);
  border-bottom: 1px solid var(--fy-line);
}

.download-box h2 {
  margin: 0 0 0.5rem;
  font-family: var(--fy-font-display);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--fy-line);
}

.post-nav a {
  text-decoration: none;
  color: var(--fy-ink);
}

.post-nav span {
  display: block;
  color: var(--fy-muted);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.post-nav__next {
  text-align: right;
}

.related {
  margin-top: 3rem;
}

.comments-area {
  margin-top: 3rem;
  max-width: var(--fy-measure);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
  max-width: 36rem;
}

.about-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  background: linear-gradient(160deg, var(--fy-wash), var(--fy-celadon-deep));
  filter: grayscale(0.25);
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1.25rem;
  padding: 0;
  list-style: none;
}

.about-links a {
  text-decoration: none;
  letter-spacing: 0.08em;
}

/* ---------- Empty / pagination ---------- */
.empty-state {
  padding: 3rem 0;
  max-width: 28ch;
  color: var(--fy-muted);
}

.empty-state h1,
.empty-state h2 {
  font-family: var(--fy-font-accent);
  letter-spacing: 0.12em;
  color: var(--fy-ink);
  font-weight: 400;
}

.pagination {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
}

.pagination .nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pagination a,
.pagination span {
  display: inline-flex;
  min-width: 2.2rem;
  min-height: 2.2rem;
  align-items: center;
  justify-content: center;
  padding: 0.25rem 0.5rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  color: var(--fy-ink);
}

.pagination .current {
  border-bottom-color: var(--fy-ink);
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--fy-line);
  padding: 2rem 0 2.75rem;
  color: var(--fy-muted);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: center;
}

.site-footer a {
  color: var(--fy-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--fy-celadon-deep);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .layout-blog,
  .single-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .toc-desktop {
    display: none;
  }

  .toc-mobile {
    display: block;
  }

  .hero__island {
    width: min(78vw, 480px);
    opacity: 0.4;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--fy-paper);
    border-bottom: 1px solid var(--fy-line-soft);
    padding: 0.85rem 1.25rem 1.25rem;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav .menu {
    flex-direction: column;
    gap: 0.85rem;
  }

  .site-header {
    position: relative;
  }

  .site-header__inner {
    position: relative;
  }

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

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

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

  .post-nav__next {
    text-align: left;
  }

  .hero__lead {
    max-width: none;
  }

  .hero__art {
    background-position: 70% center;
    opacity: 0.45;
  }

  .hero__wash {
    background:
      linear-gradient(180deg, color-mix(in srgb, var(--fy-paper) 35%, transparent) 0%, var(--fy-paper) 78%),
      linear-gradient(90deg, var(--fy-paper) 0%, color-mix(in srgb, var(--fy-paper) 70%, transparent) 55%, transparent 100%);
  }

  .hero__seal {
    width: 1.35rem;
    height: 1.35rem;
    font-size: 0.62rem;
  }
}