:root {
  --bg: #f7f4ed;
  --surface: #fffdf8;
  --surface-2: #f1ece1;
  --ink: #16202b;
  --ink-soft: #34424f;
  --muted: #5f6b73;
  --line: #e3dccd;
  --accent: #4a7a63;
  --accent-deep: #37604d;
  --accent-tint: rgba(74, 122, 99, 0.1);
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(22, 32, 43, 0.04);
  --shadow: 0 22px 50px -24px rgba(22, 32, 43, 0.28);
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

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

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

/* Top bar */
.essay-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1.1rem, 4vw, 2.5rem);
  background: rgba(247, 244, 237, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--ink);
  color: var(--surface);
  font-family: var(--serif);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 42px;
  padding: 0.5rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease;
}

.back-link:hover,
.back-link:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  outline: none;
}

/* Article */
.essay {
  width: min(720px, calc(100% - 2.4rem));
  margin: 0 auto;
  padding: clamp(2.4rem, 6vw, 4.5rem) 0 3rem;
}

.essay-cat {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent-deep);
}

.essay-title {
  margin: 0 0 0.9rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.essay-sub {
  margin: 0 0 1.6rem;
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--muted);
  font-style: italic;
  line-height: 1.5;
}

.essay-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
  color: var(--muted);
}

.essay-meta .author {
  font-weight: 600;
  color: var(--ink);
}

.essay-meta .sep {
  color: var(--line);
}

.essay-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.6rem 0 0;
}

.essay-tags span {
  border-radius: 999px;
  background: var(--accent-tint);
  color: var(--accent-deep);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.7rem;
}

.essay-body {
  margin-top: 2.4rem;
}

.essay-body p {
  margin: 0 0 1.35rem;
  color: var(--ink-soft);
}

.essay-body h2 {
  margin: 2.6rem 0 1rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.6rem;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.essay-body blockquote {
  margin: 2rem 0;
  padding: 0.4rem 0 0.4rem 1.4rem;
  border-left: 4px solid var(--accent);
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.45;
  color: var(--ink);
}

.essay-body strong {
  color: var(--ink);
}

.essay-body ul {
  margin: 0 0 1.35rem;
  padding-left: 1.2rem;
  color: var(--ink-soft);
}

.essay-body li {
  margin-bottom: 0.5rem;
}

/* Share box */
.share-box {
  margin-top: 3rem;
  padding: 1.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.share-box h3 {
  margin: 0 0 0.7rem;
  font-size: 1.15rem;
}

.share-box p {
  margin: 0 0 1.2rem;
  color: var(--ink-soft);
  font-size: 0.97rem;
}

.share-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  font-family: inherit;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}

.share-btn.primary {
  background: #0a66c2;
  border-color: #0a66c2;
  color: #fff;
}

.share-btn.primary:hover,
.share-btn.primary:focus-visible {
  background: #08589e;
  border-color: #08589e;
  outline: none;
}

.share-btn:hover,
.share-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  outline: none;
}

.share-note {
  margin: 1.2rem 0 0;
  font-size: 0.82rem;
  font-style: italic;
  color: var(--muted);
}

/* Foot nav */
.essay-foot {
  width: min(720px, calc(100% - 2.4rem));
  margin: 0 auto;
  padding: 1.5rem 0 3.5rem;
}

.essay-foot .back-link {
  width: 100%;
  justify-content: center;
}

@media (max-width: 600px) {
  body {
    font-size: 17px;
  }

  .brand-name {
    display: none;
  }

  .share-actions {
    flex-direction: column;
  }

  .share-btn {
    justify-content: center;
  }
}