/* Clearing the Path — essay page styles
   Brand-adapted from the design system.
   Loaded only on letters.html — no conflicts with style.css.
   ------------------------------------------------------------------ */

/* Additional fonts not already in style.css */
@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300..700;1,8..60,300..700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Brand tokens (essay scope) ──────────────────────────────────── */
:root {
  --paper:       #f5f3ee;
  --paper-2:     #ece8e0;
  --rule:        rgba(15, 23, 34, 0.10);
  --rule-soft:   rgba(15, 23, 34, 0.06);
  --ink:         #17202a;
  --ink-soft:    #66707a;
  --ink-mute:    #9aa4ac;
  --accent:      #1e6f74;
  --accent-soft: rgba(30, 111, 116, 0.12);

  /* Fonts */
  --serif-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --serif:         'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --mono:          'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:          'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Measure (line length) */
  --measure:      34rem;
  --measure-wide: 46rem;

  /* Fluid type scale */
  --step--1: clamp(0.78rem, 0.76rem + 0.1vw, 0.84rem);
  --step-0:  clamp(0.95rem, 0.92rem + 0.2vw, 1.05rem);
  --step-1:  clamp(1.05rem, 1.00rem + 0.3vw, 1.18rem);
  --step-2:  clamp(1.25rem, 1.15rem + 0.5vw, 1.45rem);
  --step-3:  clamp(1.55rem, 1.35rem + 1vw,   2.05rem);
  --step-4:  clamp(2.1rem,  1.7rem  + 2vw,   3.1rem);
  --step-5:  clamp(2.7rem,  2.1rem  + 3vw,   4.4rem);
  --step-6:  clamp(3.0rem,  2.2rem  + 4vw,   5.2rem);

  /* Reader top-bar offset so it sits below the sticky site header */
  --reader-bar-offset: 72px;
}

/* ── Essay area base ─────────────────────────────────────────────── */

#root {
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga";
}

#root a { color: inherit; text-decoration: none; }

/* Mono utility class (labels, meta, tags) */
.mono {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}

/* ── Shell wrapper ───────────────────────────────────────────────── */

.essay-shell {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
}

/* ── Landing page ────────────────────────────────────────────────── */

.landing {
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 4vw, 3rem);
  flex: 1;
}

/* Masthead */
.masthead {
  max-width: 64rem;
  margin: 0 auto clamp(2.5rem, 5vw, 4rem);
}

.masthead .kicker {
  margin-bottom: 1.25rem;
}

.masthead h1 {
  font-family: var(--serif-display);
  font-weight: 700;
  font-size: var(--step-6);
  line-height: 0.96;
  letter-spacing: -0.025em;
  margin: 0 0 1.25rem;
  color: var(--ink);
}

.masthead h1 em {
  font-style: italic;
  color: var(--accent);
  font-weight: 600;
}

.masthead .lede {
  font-family: var(--serif);
  font-size: var(--step-2);
  line-height: 1.45;
  color: var(--ink-soft);
  max-width: 40rem;
  margin: 0;
  font-style: italic;
}

.masthead .meta-row {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.masthead .meta-row span {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.masthead .meta-row b {
  color: var(--ink);
  font-weight: 600;
}

/* ── Controls: search + filter ───────────────────────────────────── */

.controls {
  max-width: 64rem;
  margin: 0 auto clamp(2rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 0.5rem;
}

.search-wrap input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--serif);
  font-size: var(--step-2);
  color: var(--ink);
  padding: 0.25rem 0.75rem;
  outline: none;
  font-style: italic;
}

.search-wrap input::placeholder { color: var(--ink-mute); }

.search-wrap .search-icon {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  flex-shrink: 0;
}

.search-wrap .count {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-left: 1rem;
  flex-shrink: 0;
}

.tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.tag-chip {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  cursor: pointer;
  transition: all 150ms ease;
  background: transparent;
}

.tag-chip:hover { border-color: var(--ink-soft); color: var(--ink); }

.tag-chip.active {
  background: var(--accent);
  color: #f5f3ee;
  border-color: var(--accent);
}

/* ── Article list ────────────────────────────────────────────────── */

.article-list {
  max-width: 64rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.year-marker {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin: 2.5rem 0 1rem;
}

.year-marker span:first-child {
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink-mute);
  font-style: italic;
}

.year-marker .rule {
  flex: 1;
  height: 1px;
  background: var(--rule);
  display: block;
}

/* List card */
.card {
  display: grid;
  grid-template-columns: 9rem 1fr auto;
  gap: 2rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--rule);
  cursor: pointer;
  transition: background 180ms ease, padding-left 180ms ease;
  align-items: baseline;
}

.card:last-child { border-bottom: 1px solid var(--rule); }

.card:hover {
  background: var(--paper-2);
  padding-left: 1rem;
  padding-right: 1rem;
}

.card:hover .card-arrow { transform: translateX(4px); opacity: 1; }

.card-date {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.35rem;
}

.card-date .month {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.card-date .year {
  font-family: var(--serif);
  font-size: 0.9rem;
  color: var(--ink-mute);
  font-style: italic;
}

.card-date .issue {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin-top: 0.5rem;
}

.card-body h2 {
  font-family: var(--serif-display);
  font-weight: 600;
  font-size: var(--step-3);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
  color: var(--ink);
}

.card-body .dek {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: var(--step-1);
  line-height: 1.4;
  margin: 0 0 0.75rem;
  max-width: 36rem;
}

.card-body .card-tags {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.card-body .card-tags span {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.card-arrow {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--accent);
  opacity: 0.4;
  transition: transform 200ms ease, opacity 200ms ease;
  align-self: center;
}

/* Featured card (variant = "featured") */
.featured {
  padding: 2.5rem 0 3rem;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  margin-bottom: 1rem;
}

.featured:hover h2 { color: var(--accent); }

.featured .issue-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.featured .issue-row .left {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.featured .latest-badge { color: var(--accent); }

.featured h2 {
  font-family: var(--serif-display);
  font-weight: 700;
  font-size: var(--step-5);
  line-height: 0.98;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  transition: color 200ms ease;
  max-width: 22ch;
  color: var(--ink);
}

.featured .dek {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: var(--step-2);
  line-height: 1.35;
  max-width: 44rem;
  margin: 0 0 1.5rem;
}

.featured .read-btn {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.featured .read-btn::after {
  content: "→";
  transition: transform 200ms ease;
}

.featured:hover .read-btn::after { transform: translateX(4px); }

/* Grid variant */
.article-list.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}

.article-list.grid .card {
  grid-template-columns: 1fr;
  padding: 1.75rem;
  border-top: none;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  min-height: 16rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.article-list.grid .card:hover {
  padding-left: 1.75rem;
  padding-right: 1.75rem;
  background: var(--paper-2);
}

.article-list.grid .card-arrow { display: none; }
.article-list.grid .card-date { flex-direction: row; gap: 0.6rem; }

/* ── Reader ──────────────────────────────────────────────────────── */

.reader {
  animation: essay-fade-in 280ms ease;
}

@keyframes essay-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Progress bar — fixed at top, above the sticky site header */
.reader-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: var(--accent);
  z-index: 200;
  transition: width 80ms linear;
  border-radius: 0 2px 2px 0;
}

/* Reader top bar — sticky below the site header */
.reader-top {
  position: sticky;
  top: var(--reader-bar-offset);
  background: rgba(245, 243, 238, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem clamp(1.25rem, 4vw, 3rem);
  border-bottom: 1px solid var(--rule);
}

.reader-top .back {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 150ms ease;
}

.reader-top .back:hover { color: var(--accent); }
.reader-top .back::before { content: "←"; }

.reader-top .controls-right {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.reader-top .size-group {
  display: flex;
  align-items: center;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.1rem;
}

.reader-top .size-group button {
  font-family: var(--serif);
  color: var(--ink-soft);
  background: none;
  border: none;
  padding: 0.25rem 0.55rem;
  cursor: pointer;
  border-radius: 999px;
  transition: all 150ms ease;
  line-height: 1;
}

.reader-top .size-group button:hover { background: var(--paper-2); color: var(--ink); }

.reader-top .size-group .active {
  background: var(--ink);
  color: var(--paper);
}

/* Article container */
.article {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) 1.5rem clamp(3rem, 6vw, 5rem);
}

.article-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
}

.article-header .mono {
  display: block;
  margin-bottom: 1.25rem;
}

.article-header h1 {
  font-family: var(--serif-display);
  font-weight: 700;
  font-size: var(--step-5);
  line-height: 1.02;
  letter-spacing: -0.022em;
  margin: 0 0 1rem;
  color: var(--ink);
}

.article-header .dek {
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--step-2);
  color: var(--ink-soft);
  line-height: 1.4;
  margin: 0;
}

.article-header .byline {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* Prose — the reading experience */
.prose {
  font-family: var(--serif);
  font-size: calc(var(--step-1) * var(--reader-scale, 1));
  line-height: 1.75;
  color: var(--ink);
}

.prose > * + * { margin-top: 1.3em; }
.prose p { margin: 0; }

.prose h2 {
  font-family: var(--serif-display);
  font-weight: 600;
  font-size: calc(var(--step-3) * var(--reader-scale, 1));
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-top: 2.5em;
  margin-bottom: 0.5em;
  color: var(--ink);
}

.prose h3 {
  font-family: var(--serif-display);
  font-weight: 600;
  font-style: italic;
  font-size: calc(var(--step-2) * var(--reader-scale, 1));
  margin-top: 2em;
  margin-bottom: 0.25em;
  color: var(--ink);
}

.prose blockquote {
  margin: 2.5em auto;
  padding: 0;
  border: none;
  font-family: var(--serif);
  font-style: italic;
  font-size: calc(var(--step-2) * var(--reader-scale, 1));
  line-height: 1.45;
  color: var(--ink);
  text-align: center;
  max-width: 28rem;
  position: relative;
}

.prose blockquote::before,
.prose blockquote::after {
  content: "";
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--accent);
  margin: 1.25em auto;
  opacity: 0.5;
}

.prose blockquote p { margin: 0; }

.prose hr {
  border: none;
  text-align: center;
  margin: 3em 0;
}

.prose hr::before {
  content: "❦";
  font-size: 1.1em;
  color: var(--ink-mute);
  letter-spacing: 0.5em;
}

.prose a {
  color: var(--ink);
  background-image: linear-gradient(
    transparent 62%,
    var(--accent-soft) 62%,
    var(--accent-soft) 92%,
    transparent 92%
  );
  transition: color 200ms, background-image 200ms;
}

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

.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 0.1em 0.35em;
  background: var(--paper-2);
  border-radius: 3px;
}

.prose pre {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 1rem;
  overflow-x: auto;
  border-radius: 4px;
  font-size: 0.85em;
}

.prose pre code { background: none; padding: 0; }

.prose img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2em auto;
  border-radius: 4px;
}

.prose ul, .prose ol { padding-left: 1.5em; }
.prose li + li { margin-top: 0.4em; }

/* Drop cap (first paragraph) */
.drop-cap .prose > p:first-child::first-letter {
  font-family: var(--serif-display);
  font-weight: 700;
  font-size: 4.4em;
  line-height: 0.82;
  float: left;
  padding: 0.1em 0.12em 0 0;
  color: var(--accent);
}

/* ── Prev / Next nav ─────────────────────────────────────────────── */

.reader-nav {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.reader-nav a {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  cursor: pointer;
  transition: all 180ms ease;
}

.reader-nav a:hover {
  border-color: var(--accent);
  background: var(--paper-2);
}

.reader-nav .dir {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.reader-nav .title {
  font-family: var(--serif);
  font-size: var(--step-1);
  color: var(--ink);
  line-height: 1.2;
}

.reader-nav .next { text-align: right; }
.reader-nav .disabled { opacity: 0.3; pointer-events: none; cursor: default; }

/* ── State classes ───────────────────────────────────────────────── */

.loading {
  text-align: center;
  padding: 6rem 2rem;
  color: var(--ink-mute);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.empty {
  max-width: 64rem;
  margin: 0 auto;
  padding: 4rem 0;
  text-align: center;
  color: var(--ink-mute);
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--step-1);
}

/* ── Focus ring ──────────────────────────────────────────────────── */

#root :focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ── Responsive ──────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .card {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.5rem 0;
  }

  .card-arrow { display: none; }
  .card-date { flex-direction: row; gap: 0.75rem; align-items: baseline; }
  .card:hover { padding-left: 0; padding-right: 0; }
  .featured { padding: 2rem 0 2.5rem; }
  .search-wrap .count { display: none; }
  .article { padding-left: 1.25rem; padding-right: 1.25rem; }
  .reader-nav { grid-template-columns: 1fr; }
  .reader-top { padding: 0.85rem 1rem; }
  :root { --reader-bar-offset: 60px; }
}

@media (max-width: 420px) {
  .masthead h1 { font-size: var(--step-5); }
  .featured h2 { font-size: var(--step-4); }
}