:root {
  --ink: #15161a;
  --paper: #f4f4f1;
  --card: #ffffff;
  --line: #e0e0d9;
  --muted: #6a6b72;
  --accent: #3a32d8;
  --amber: #b8720f;
  --green: #2c7a5b;
  --clay: #a4432f;
  --radius: 6px;
  --wrap: 1080px;
  --display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
}

h1, h2, h3, h4 { font-family: var(--display); margin: 0; line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: 2.2rem; font-weight: 700; }
h2 { font-size: 1.4rem; font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 700; }
p { margin: 0 0 1rem; }
a { color: var(--ink); }
img { max-width: 100%; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--ink); color: #fff;
  padding: 10px 14px; z-index: 20;
}
.skip:focus { left: 8px; top: 8px; }

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

/* Header */
.topbar { background: var(--card); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 20px; height: 62px; }

.wordmark { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.wordmark-mark {
  width: 26px; height: 26px; display: grid; place-items: center;
  background: var(--ink); color: #fff; font-family: var(--display); font-weight: 700;
  border-radius: 4px; font-size: 15px;
}
.wordmark-text { font-family: var(--display); font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em; }

.nav { display: flex; gap: 18px; margin-right: auto; flex-wrap: wrap; }
.nav a {
  text-decoration: none; color: var(--muted); font-size: 0.92rem; font-weight: 500;
  padding: 4px 0; border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--ink); }
.nav a.on { color: var(--ink); border-bottom-color: var(--ink); }

.topbar-user { display: flex; align-items: center; gap: 12px; }
.score {
  display: flex; align-items: baseline; gap: 5px; font-family: var(--mono);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 5px 10px; font-size: 0.8rem;
}
.score-num { font-weight: 700; font-size: 0.95rem; }
.score-num.streak { color: var(--amber); }
.score-label { color: var(--muted); font-size: 0.72rem; }
.score-sep { width: 1px; height: 14px; background: var(--line); margin: 0 4px; align-self: center; }

.avatar {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: var(--ink); color: #fff; font-family: var(--mono); font-size: 0.75rem;
  font-weight: 700; text-decoration: none;
}

/* Buttons */
.btn {
  display: inline-block; font-family: var(--body); font-size: 0.9rem; font-weight: 500;
  padding: 9px 16px; border-radius: var(--radius); border: 1px solid var(--line);
  background: var(--card); color: var(--ink); text-decoration: none; cursor: pointer;
}
.btn:hover { border-color: var(--ink); }
.btn-solid { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-solid:hover { background: #000; }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-quiet { background: transparent; border-color: transparent; }
.btn-quiet:hover { border-color: var(--line); }
.btn-small { padding: 6px 11px; font-size: 0.82rem; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Flash */
.flash {
  margin: 16px 0 0; padding: 11px 14px; border: 1px solid var(--line);
  border-left: 3px solid var(--muted); background: var(--card); border-radius: var(--radius);
  font-size: 0.9rem;
}
.flash-good { border-left-color: var(--green); }

/* Sections and cards */
.section { padding: 40px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.section-head p { color: var(--muted); margin: 4px 0 0; font-size: 0.9rem; }
.eyebrow {
  font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--muted); margin: 0 0 8px;
}
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.split { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; align-items: start; }
.muted { color: var(--muted); }
.small { font-size: 0.86rem; }
.mono { font-family: var(--mono); }
.stack > * + * { margin-top: 14px; }

/* Landing hero */
.hero { padding: 72px 0 48px; border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: 3.1rem; line-height: 1.05; }
.hero-slogan { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em; color: var(--accent); margin-bottom: 14px; }
.hero-lead { font-size: 1.05rem; color: var(--muted); max-width: 46ch; }
.hero-stats { display: flex; gap: 28px; margin-top: 28px; }
.hero-stat-num { font-family: var(--mono); font-size: 1.5rem; font-weight: 700; display: block; }
.hero-stat-label { font-size: 0.78rem; color: var(--muted); }

/* Scorecard panel used in the hero */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted);
}
.panel-body { padding: 16px; }
.panel-row { display: flex; justify-content: space-between; align-items: center; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 0.9rem; }
.panel-row:last-child { border-bottom: 0; }
.panel-value { font-family: var(--mono); font-weight: 700; }

/* Week strip: one block per day, filled when the page goal is met */
.week { display: flex; gap: 6px; }
.week-day { flex: 1; text-align: center; }
.week-block {
  height: 40px; border: 1px solid var(--line); border-radius: 4px; background: var(--card);
  display: grid; place-items: center; font-family: var(--mono); font-size: 0.72rem; color: var(--muted);
}
.week-block.hit { background: var(--ink); border-color: var(--ink); color: #fff; }
.week-block.today { border-color: var(--accent); }
.week-label { font-family: var(--mono); font-size: 0.68rem; color: var(--muted); margin-top: 5px; }

/* Meters */
.meter { height: 6px; background: #ecece8; border-radius: 3px; overflow: hidden; }
.meter-fill { height: 100%; background: var(--ink); }
.meter-fill.accent { background: var(--accent); }
.meter-fill.amber { background: var(--amber); }
.meter-line { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); margin-bottom: 6px; }

/* Books */
.book-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.book-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; display: block; }
.book-card:hover { border-color: var(--ink); }
.cover {
  aspect-ratio: 3 / 4; padding: 16px; display: flex; flex-direction: column; justify-content: space-between;
  color: #fff;
}
.cover-ink { background: #22242c; }
.cover-violet { background: #3a32d8; }
.cover-amber { background: #b8720f; }
.cover-green { background: #2c7a5b; }
.cover-clay { background: #a4432f; }
.cover-title { font-family: var(--display); font-weight: 700; font-size: 1.02rem; line-height: 1.2; }
.cover-author { font-size: 0.78rem; opacity: 0.85; }
.cover-tag { font-family: var(--mono); font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.1em; opacity: 0.85; }
.book-meta { padding: 12px 14px; }
.book-meta h3 { font-size: 0.95rem; }
.book-meta .line { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); margin-top: 8px; }

.cover-lg { width: 200px; flex: none; border-radius: var(--radius); }

/* Tags */
.tag {
  display: inline-block; font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase;
  letter-spacing: 0.08em; padding: 3px 8px; border: 1px solid var(--line); border-radius: 3px; color: var(--muted);
}
.tag-list { display: flex; gap: 6px; flex-wrap: wrap; }

/* Filters */
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 22px; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"], select, textarea {
  font-family: var(--body); font-size: 0.92rem; padding: 9px 11px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--card); color: var(--ink); width: 100%;
}
textarea { resize: vertical; min-height: 90px; }
label { display: block; font-size: 0.82rem; font-weight: 500; margin-bottom: 5px; }
.field { margin-bottom: 14px; }
.field-inline { display: flex; gap: 10px; align-items: flex-end; }

/* Lists */
.row-list { border-top: 1px solid var(--line); }
.row {
  display: flex; align-items: center; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--line);
}
.row-main { flex: 1; min-width: 0; }
.row-title { font-weight: 500; font-size: 0.95rem; text-decoration: none; }
.row-title:hover { text-decoration: underline; }
.row-num { font-family: var(--mono); font-weight: 700; }
.rank { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); width: 28px; }

/* Challenges */
.challenge { display: flex; flex-direction: column; gap: 10px; }
.challenge-reward { font-family: var(--mono); font-size: 0.75rem; color: var(--accent); }
.challenge.done { border-color: var(--ink); }

/* Milestones */
.badge-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.badge { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; background: var(--card); }
.badge.locked { opacity: 0.6; }
.badge-tier {
  font-family: var(--mono); font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--muted);
}
.badge-tier.gold { color: var(--amber); }
.badge-tier.silver { color: var(--muted); }
.badge-tier.bronze { color: var(--clay); }
.badge-pin { font-family: var(--mono); font-size: 0.68rem; color: var(--accent); }

/* Reader */
.reader { max-width: 720px; margin: 0 auto; }
.reader-page {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 40px; font-size: 1.05rem; line-height: 1.75; min-height: 420px;
}
.reader-page p { margin-bottom: 1.1rem; }
.reader-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 16px 0; }
.reader-page-num { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }

/* Posts */
.post { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); padding: 16px; }
.post-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.post-author { font-weight: 500; font-size: 0.9rem; text-decoration: none; }
.post-time { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); }
.comment { border-top: 1px solid var(--line); padding-top: 10px; margin-top: 12px; font-size: 0.9rem; }
.avatar-sm {
  width: 28px; height: 28px; border-radius: 50%; background: var(--ink); color: #fff;
  display: grid; place-items: center; font-family: var(--mono); font-size: 0.65rem; text-decoration: none;
}

/* Auth */
.auth { max-width: 420px; margin: 56px auto; }
.errors { border: 1px solid var(--clay); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 16px; background: var(--card); }
.errors ul { margin: 0; padding-left: 18px; font-size: 0.88rem; }

/* Profile */
.profile-head { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
.avatar-lg {
  width: 72px; height: 72px; border-radius: 50%; background: var(--ink); color: #fff;
  display: grid; place-items: center; font-family: var(--mono); font-size: 1.3rem; font-weight: 700;
}
.stat-row { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 8px; }
.stat-num { font-family: var(--mono); font-size: 1.35rem; font-weight: 700; display: block; }
.stat-label { font-size: 0.75rem; color: var(--muted); }

/* Footer */
.footer { border-top: 1px solid var(--line); background: var(--card); margin-top: 56px; padding: 32px 0; }
.footer-inner { display: flex; flex-direction: column; gap: 10px; }
.footer-slogan { font-family: var(--display); font-weight: 700; margin: 0; }
.footer-nav { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-nav a { font-size: 0.88rem; color: var(--muted); text-decoration: none; }
.footer-nav a:hover { color: var(--ink); }
.footer-note { font-size: 0.78rem; color: var(--muted); margin: 0; }

@media (max-width: 900px) {
  .hero-inner, .split { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2.3rem; }
  .book-grid, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .badge-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { gap: 14px; font-size: 0.85rem; }
  .score { display: none; }
}

@media (max-width: 620px) {
  .topbar-inner { height: auto; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
  .nav { order: 3; width: 100%; margin: 0; }
  .grid-2, .grid-3, .grid-4, .badge-grid { grid-template-columns: 1fr; }
  .book-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .cover { padding: 12px; }
  .cover-title { font-size: 0.9rem; }
  .reader-page { padding: 24px; }
  .cover-lg { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}