/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Base ── */
:root {
  --color-text: #111;
  --color-secondary: #444;
  --color-muted: #666;
  --color-subtle: #999;
  --color-faint: #bbb;
  --color-border: #e5e5e5;
  --color-bg: #fff;
  --font-sans: -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --padding-x: 5vw;
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

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

/* ── Layout wrapper ── */
.site-wrapper {
  width: 100%;
}

/* ── Nav ── */
.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px var(--padding-x);
  border-bottom: 1px solid var(--color-border);
}

.nav-brand {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.3px;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--color-text); text-decoration: none; }

/* ── Hero (homepage) ── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  padding: 64px var(--padding-x) 56px;
  border-bottom: 1px solid var(--color-border);
}

.hero-headline {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  color: var(--color-text);
  margin-bottom: 24px;
}

.hero-headline em {
  font-style: italic;
  color: #c0392b;
}

.hero-bio {
  font-size: 13px;
  color: #666;
  line-height: 1.9;
  margin-bottom: 28px;
  font-family: var(--font-serif);
}

.hero-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 18px;
  align-items: baseline;
}

.meta-key {
  font-size: 10px;
  color: var(--color-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  white-space: nowrap;
  font-weight: 500;
}

.meta-val {
  font-size: 13px;
  color: var(--color-secondary);
}

/* ── Dispatch (homepage right col) ── */
.dispatch-label {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.dispatch-label span {
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-subtle);
  padding-bottom: 3px;
}

.dispatch-label span.active {
  color: var(--color-text);
  border-bottom: 1px solid var(--color-text);
}

.dispatch-list { list-style: none; }

.dispatch-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.d-tag {
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--color-muted);
  background: #f4f4f4;
  padding: 2px 7px;
  border-radius: 3px;
  min-width: 44px;
  text-align: center;
  margin-top: 2px;
  flex-shrink: 0;
}

.d-title {
  font-size: 14px;
  color: var(--color-secondary);
  line-height: 1.5;
  font-family: var(--font-serif);
}

.d-when {
  font-size: 11px;
  color: var(--color-faint);
  margin-left: auto;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Section ── */
.section {
  padding: 48px var(--padding-x);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 28px;
}

.section-header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ── Article list ── */
.article-list { list-style: none; }

.article-item {
  display: grid;
  grid-template-columns: 88px 1fr 16px;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.a-date {
  font-size: 11px;
  color: var(--color-subtle);
  font-family: monospace;
}

.a-title {
  font-size: 15px;
  color: var(--color-secondary);
  font-family: var(--font-serif);
  line-height: 1.5;
}

.a-title:hover { color: var(--color-text); }

.a-arrow { font-size: 12px; color: var(--color-subtle); }

.view-all {
  display: inline-block;
  margin-top: 22px;
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.5px;
}

.view-all:hover { color: var(--color-text); text-decoration: none; }

/* ── Book grid ── */
.book-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.book-card {
  border: 1px solid var(--color-border);
  padding: 20px;
  transition: border-color 0.15s;
}

.book-card:hover { border-color: #bbb; }

.book-status {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: 10px;
  margin-bottom: 12px;
  background: #f2f2f2;
  color: var(--color-muted);
}

.book-status.reading {
  background: #edf7f2;
  color: #2d7a4f;
}

.book-title {
  font-size: 14px;
  color: var(--color-secondary);
  font-family: var(--font-serif);
  line-height: 1.4;
  margin-bottom: 6px;
}

.book-author { font-size: 12px; color: var(--color-muted); }

/* ── Article single page ── */
.article-single {
  max-width: 640px;
  margin: 0 auto;
  padding: 56px var(--padding-x) 80px;
}

.article-single .article-header { margin-bottom: 40px; }

.article-single .article-title-main {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  font-family: var(--font-serif);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.article-single .article-meta {
  font-size: 12px;
  color: var(--color-muted);
  display: flex;
  gap: 16px;
}

.article-single .article-body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.9;
  color: #333;
}

.article-single .article-body p { margin-bottom: 1.5em; }
.article-single .article-body h2 { font-size: 20px; margin: 2em 0 0.8em; }
.article-single .article-body h3 { font-size: 17px; margin: 1.8em 0 0.6em; }
.article-single .article-body blockquote {
  border-left: 3px solid #ddd;
  padding-left: 20px;
  color: #666;
  margin: 1.5em 0;
}

.article-nav {
  display: flex;
  justify-content: space-between;
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.article-nav a { font-size: 13px; color: var(--color-muted); }

/* ── About / Contact / standalone page ── */
.page-single {
  max-width: 640px;
  margin: 0 auto;
  padding: 64px var(--padding-x) 80px;
}

.page-headline {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 32px;
}

.page-headline em { font-style: italic; color: #c0392b; }

.page-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 20px;
  margin-bottom: 36px;
  align-items: baseline;
}

.page-body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.9;
  color: #333;
}

.page-body p { margin-bottom: 1.4em; }

/* ── Footer ── */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px var(--padding-x);
  border-top: 1px solid var(--color-border);
}

.footer-copy { font-size: 11px; color: var(--color-subtle); }

.footer-links { display: flex; gap: 20px; }

.footer-links a {
  font-size: 11px;
  color: var(--color-muted);
}

.footer-links a:hover { color: var(--color-text); text-decoration: none; }

/* ── Articles full list page ── */
.articles-page { padding: 56px var(--padding-x) 80px; }

.articles-page h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 40px;
}

/* ── Books full page ── */
.books-page { padding: 56px var(--padding-x) 80px; }

.books-page h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 40px;
}

/* ── Projects page ── */
.projects-page {
  padding: 56px var(--padding-x) 80px;
}

.projects-header {
  margin-bottom: 48px;
}

.projects-header h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.projects-subtitle {
  font-size: 14px;
  color: var(--color-muted);
  font-family: var(--font-serif);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  border: 1px solid var(--color-border);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.project-card:hover {
  border-color: #bbb;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.project-card-top {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.project-name-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.project-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.project-name-en {
  font-size: 12px;
  color: var(--color-subtle);
  font-family: var(--font-serif);
  font-style: italic;
}

.project-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.project-tag {
  font-size: 10px;
  color: var(--color-muted);
  background: #f4f4f4;
  padding: 2px 8px;
  border-radius: 10px;
  letter-spacing: 0.3px;
}

.project-desc {
  font-size: 14px;
  color: var(--color-muted);
  font-family: var(--font-serif);
  line-height: 1.8;
  flex: 1;
}

.project-footer {
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.project-link {
  font-size: 12px;
  color: var(--color-text);
  font-weight: 500;
  letter-spacing: 0.3px;
}

.project-link:hover { text-decoration: underline; }

.project-github {
  font-size: 11px;
  color: var(--color-subtle);
  border: 1px solid var(--color-border);
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.project-github:hover {
  color: var(--color-text);
  border-color: #bbb;
  text-decoration: none;
}

/* ── Dark mode ── */
[data-theme="dark"] {
  --color-text: #e8e8e8;
  --color-secondary: #c0c0c0;
  --color-muted: #888;
  --color-subtle: #666;
  --color-faint: #444;
  --color-border: #2a2a2a;
  --color-bg: #111;
}

[data-theme="dark"] .d-tag,
[data-theme="dark"] .project-tag {
  background: #222;
}

[data-theme="dark"] .book-card,
[data-theme="dark"] .project-card {
  background: #161616;
}

[data-theme="dark"] .book-status {
  background: #222;
}

[data-theme="dark"] .book-status.reading {
  background: #0d2e1e;
  color: #4caf82;
}

/* ── Scroll progress bar ── */
#scroll-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: #c0392b;
  z-index: 1000;
  transition: width 0.1s linear;
}

/* ── Theme toggle button ── */
.theme-btn {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  cursor: pointer;
  font-size: 14px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, border-color 0.15s, transform 0.15s;
  flex-shrink: 0;
  margin-left: 8px;
  padding: 0;
}

.theme-btn:hover {
  color: var(--color-text);
  border-color: #bbb;
  transform: rotate(20deg);
}

/* ── Back to top ── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 40px;
  height: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  border-radius: 50%;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, color 0.15s, border-color 0.15s, transform 0.15s;
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  color: var(--color-text);
  border-color: #bbb;
  transform: translateY(-3px);
}

/* ── Enhanced hovers ── */
.article-item {
  transition: background 0.15s;
}

.article-item:hover {
  background: #fafafa;
}

[data-theme="dark"] .article-item:hover {
  background: #181818;
}

.dispatch-item {
  transition: background 0.15s;
}

.dispatch-item:hover {
  background: #fafafa;
}

[data-theme="dark"] .dispatch-item:hover {
  background: #181818;
}

.book-card {
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.book-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

[data-theme="dark"] .book-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.project-card {
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.project-card:hover {
  transform: translateY(-2px);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  :root { --padding-x: 20px; }

  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 40px var(--padding-x) 40px;
  }

  .hero-headline { font-size: 30px; }

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

  .article-item { grid-template-columns: 1fr; gap: 4px; }
  .a-arrow { display: none; }
}