:root {
  --bg: #ffffff;
  --text: #15171a;
  --text-secondary: rgba(21, 23, 26, 0.55);
  --accent: #FF1A75;
  --border: rgba(21, 23, 26, 0.08);
  --border-dark: rgba(21, 23, 26, 0.2);
  --font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  --container: 1200px;
  --gap: 40px;
  --radius: 4px;
}

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

html { font-size: 62.5%; }

body {
  font-family: var(--font);
  font-size: 1.6rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

/* ── Container ──────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 1.4rem;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  transition: opacity 0.15s;
  white-space: nowrap;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-sm { padding: 6px 16px; font-size: 1.3rem; }
.btn-full { width: 100%; padding: 12px 20px; font-size: 1.5rem; border-radius: 6px; }

/* ── Reading progress bar ────────────────────────────── */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent);
  z-index: 1000;
  transition: width 0.1s linear;
}

/* ── Header ──────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}
.post-entry .site-header { top: 3px; }

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}

.site-logo img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-link {
  padding: 6px 12px;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text);
  border-radius: var(--radius);
  transition: background 0.1s;
}
.nav-link:hover { background: rgba(21, 23, 26, 0.05); }
.nav-link.active { font-weight: 600; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.sign-in-link {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.sign-in-link:hover { color: var(--text); }

/* ── Home hero ───────────────────────────────────────── */
.home-hero {
  border-bottom: 1px solid var(--border);
  padding: 40px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--gap);
  align-items: start;
}

.hero-card {
  display: block;
}

.hero-image {
  aspect-ratio: 16/9;
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.hero-card:hover .hero-image img { transform: scale(1.02); }

.hero-meta {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(2.4rem, 3vw, 3.2rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 12px;
}
.hero-card:hover .hero-title { color: var(--accent); }

.hero-excerpt {
  font-size: 1.6rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Featured sidebar ────────────────────────────────── */
.hero-sidebar {
  border-left: 1px solid var(--border);
  padding-left: var(--gap);
}

.sidebar-label {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.sidebar-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.sidebar-card:last-child { border-bottom: none; }

.sidebar-card-text { flex: 1; min-width: 0; }

.sidebar-card-title {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 6px;
}
.sidebar-card:hover .sidebar-card-title { color: var(--accent); }

.sidebar-card-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.sidebar-card-image {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  border-radius: var(--radius);
  overflow: hidden;
}
.sidebar-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── Latest / Post grid ──────────────────────────────── */
.home-latest { padding: 40px 0; }

.section-label {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--gap);
}

.post-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: box-shadow 0.2s, border-color 0.2s;
}
.post-card:hover {
  border-color: var(--border-dark);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.post-card-image {
  aspect-ratio: 16/9;
  overflow: hidden;
}
.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.post-card:hover .post-card-image img { transform: scale(1.03); }

.post-card-body {
  padding: 20px;
  flex: 1;
}

.post-card-title {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
}
.post-card:hover .post-card-title { color: var(--accent); }

.post-card-meta {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.post-card-excerpt {
  font-size: 1.5rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── Post / Page entry ───────────────────────────────── */
.post-hero {
  background-size: cover;
  background-position: center;
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: flex-end;
}

.post-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.7) 100%);
  display: flex;
  align-items: flex-end;
  padding: 48px 0;
  width: 100%;
}

.post-header { padding: 40px 0 0; }
.post-header-simple { padding: 48px 0 32px; }

.post-title {
  font-size: clamp(2.8rem, 5vw, 4.8rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
}
.post-hero .post-title { color: #fff; }

.post-meta {
  font-size: 1.4rem;
  color: var(--text-secondary);
  display: flex;
  gap: 6px;
}
.post-hero .post-meta { color: rgba(255,255,255,0.75); }

.post-content {
  max-width: 720px;
  margin: 48px auto;
  font-size: 1.8rem;
  line-height: 1.7;
}

.post-content h1, .post-content h2, .post-content h3,
.post-content h4, .post-content h5, .post-content h6 {
  margin: 2em 0 0.5em;
  line-height: 1.25;
  font-weight: 700;
}
.post-content h2 { font-size: 2.8rem; }
.post-content h3 { font-size: 2.2rem; }
.post-content p { margin-bottom: 1.5em; }
.post-content a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.post-content a:hover { opacity: 0.8; }
.post-content img { border-radius: var(--radius); margin: 2em auto; }
.post-content ul, .post-content ol { margin: 1em 0 1.5em 2em; }
.post-content li { margin-bottom: 0.5em; }
.post-content blockquote {
  border-left: 4px solid var(--accent);
  margin: 2em 0;
  padding: 1em 2em;
  color: var(--text-secondary);
  font-style: italic;
}
.post-content code {
  background: rgba(21,23,26,0.06);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: "JetBrains Mono", Menlo, monospace;
}
.post-content pre {
  background: rgba(21,23,26,0.06);
  padding: 2em;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 2em 0;
}
.post-content pre code { background: none; padding: 0; }
.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3em 0;
}

/* ── Page ────────────────────────────────────────────── */
.page-header { padding: 48px 0 32px; }
.page-title {
  font-size: clamp(3.2rem, 5vw, 5.2rem);
  font-weight: 800;
  line-height: 1.1;
}
.page-content .post-content { max-width: 720px; margin-left: 0; }

/* ── Books ───────────────────────────────────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--gap);
  padding: 32px 0 64px;
}

.book-card { display: flex; flex-direction: column; gap: 16px; }

.book-cover-link {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  transition: transform 0.2s, box-shadow 0.2s;
}
.book-cover-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.book-cover { width: 100%; aspect-ratio: 2/3; object-fit: cover; }

.book-info { display: flex; flex-direction: column; gap: 8px; }

.book-title {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.3;
}

.book-desc {
  font-size: 1.4rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── More posts ──────────────────────────────────────── */
.more-posts {
  padding: 48px 0 64px;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}
.post-grid--small .post-card-title { font-size: 1.6rem; }

/* ── Login ───────────────────────────────────────────── */
.login-page {
  min-height: calc(100vh - 140px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}

.login-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.08);
}

.login-logo {
  border-radius: 50%;
  object-fit: cover;
}

.login-title {
  font-size: 2.4rem;
  font-weight: 700;
  text-align: center;
}

.login-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  font-size: 1.5rem;
  font-family: var(--font);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.login-input:focus { border-color: var(--accent); }

.login-notice {
  font-size: 1.4rem;
  text-align: center;
  color: var(--text-secondary);
}

.login-footer {
  font-size: 1.4rem;
  color: var(--text-secondary);
  text-align: center;
}
.login-footer a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }

/* ── Footer ──────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 56px;
}

.footer-logo img { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }

.footer-nav { display: flex; gap: 16px; }
.footer-nav a { font-size: 1.4rem; color: var(--text-secondary); }
.footer-nav a:hover { color: var(--text); }

.subscribe-footer {
  background: #f9f9f9;
  border-top: 1px solid var(--border);
  padding: 64px 0;
  text-align: center;
}

.subscribe-inner { max-width: 560px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 16px; }

.subscribe-title { font-size: 3.2rem; font-weight: 800; }
.subscribe-desc { font-size: 1.6rem; color: var(--text-secondary); }

.subscribe-form {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 400px;
}

.subscribe-form input {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid var(--border-dark);
  border-radius: 20px;
  font-size: 1.5rem;
  font-family: var(--font);
  color: var(--text);
  outline: none;
}
.subscribe-form input:focus { border-color: var(--accent); }

.subscribe-notice { font-size: 1.4rem; color: var(--text-secondary); }

/* ── 404 ─────────────────────────────────────────────── */
.error-page {
  text-align: center;
  padding: 120px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.error-code { font-size: 8rem; font-weight: 800; color: var(--border-dark); }
.error-message { font-size: 2rem; color: var(--text-secondary); }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-sidebar { border-left: none; border-top: 1px solid var(--border); padding-left: 0; padding-top: 32px; }
  .post-grid { grid-template-columns: 1fr; }
  .books-grid { grid-template-columns: repeat(2, 1fr); }
  .subscribe-form { flex-direction: column; }
  .login-card { padding: 32px 24px; }
  .post-hero { min-height: 280px; }
}

@media (max-width: 480px) {
  .site-nav .nav-link { padding: 6px 8px; font-size: 1.4rem; }
  .books-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .post-content { font-size: 1.7rem; }
}