/* ---------- tokens ---------- */
:root {
  --paper: #f6f3ee;
  --paper-2: #ede8df;
  --card: #fffdf9;
  --ink: #1c1b19;
  --ink-2: #4a4742;
  --muted: #7a756d;
  --line: #ddd7cc;
  --accent: #a0341f;
  --accent-ink: #fff;
  --free: #2f6b3a;
  --free-bg: #e3efe2;
  --warn: #8a5a00;
  --warn-bg: #f7ecd0;
  --bad: #a52a2a;
  --bad-bg: #f6e0dc;
  --cream: #f6efe3;
  --shadow: 0 1px 0 rgba(0,0,0,.04), 0 10px 30px -18px rgba(40,30,10,.35);
  --serif: "Fraunces", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --r: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #15140f;
    --paper-2: #1d1b15;
    --card: #1f1d17;
    --ink: #ece7dc;
    --ink-2: #c4bdb0;
    --muted: #8f887b;
    --line: #2f2c24;
    --accent: #e0694f;
    --accent-ink: #1a0d08;
    --free: #7fc48b;
    --free-bg: #1c2b1e;
    --warn: #e0b45a;
    --warn-bg: #2c2412;
    --bad: #f0857a;
    --bad-bg: #331b19;
    --cream: #ece4d4;
    --shadow: 0 1px 0 rgba(0,0,0,.3), 0 12px 30px -18px rgba(0,0,0,.9);
  }
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 15.5px/1.6 var(--sans); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: inherit; }
h1, h2, h3, .serif { font-family: var(--serif); font-weight: 500; letter-spacing: -.01em; }
h1 em, .brand-name em { font-style: italic; font-weight: 400; }
code { font-family: var(--mono); font-size: .88em; background: var(--paper-2); padding: .1em .4em; border-radius: 4px; }
kbd { font-family: var(--mono); }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
::selection { background: color-mix(in srgb, var(--accent) 25%, transparent); }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--paper); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-name { font-family: var(--serif); font-size: 18px; letter-spacing: -.01em; }
.brand-mark { width: 20px; height: 26px; border-radius: 2px 4px 4px 2px; background: var(--accent); position: relative; box-shadow: inset 4px 0 0 rgba(0,0,0,.28); }
.brand-mark::after { content: ""; position: absolute; left: 8px; right: 4px; top: 6px; height: 2px; background: var(--cream); box-shadow: 0 5px 0 var(--cream), 0 10px 0 var(--cream); opacity: .9; }
.site-nav { display: flex; align-items: center; gap: 22px; font-size: 14px; line-height: 1; }
.site-nav a { color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.site-nav a:hover { color: var(--accent); }
.site-nav .sponsor { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: var(--card); font-weight: 500; line-height: 1; transition: border-color .12s, color .12s; }
.site-nav .sponsor svg { color: #bf3989; }
.site-nav .sponsor:hover { border-color: #bf3989; color: #bf3989; }

/* ---------- hero ---------- */
.hero { padding: 64px 0 40px; border-bottom: 1px solid var(--line); background:
  radial-gradient(1200px 400px at 10% -20%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 70%); }
.eyebrow { margin: 0 0 14px; font-size: 12.5px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.hero h1 { font-size: clamp(36px, 5.2vw, 60px); line-height: 1.04; margin: 0 0 18px; font-weight: 500; font-variation-settings: "opsz" 144; }
.lede { max-width: 680px; font-size: 17px; color: var(--ink-2); margin: 0 0 30px; }
.lede strong { color: var(--free); font-weight: 600; }
.search { position: relative; max-width: 720px; }
.search input {
  width: 100%; font: 500 17px/1.2 var(--sans); color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 14px; padding: 16px 56px 16px 50px; outline: none; box-shadow: var(--shadow);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' stroke='%237a756d' stroke-width='1.8' stroke-linecap='round'%3E%3Ccircle cx='9' cy='9' r='6.5'/%3E%3Cpath d='M14 14l4.5 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: 18px 50%; transition: border-color .15s, box-shadow .15s;
}
.search input::placeholder { color: var(--muted); font-weight: 400; }
.search input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent), var(--shadow); }
.search-kbd { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 6px; padding: 2px 8px; background: var(--paper-2); }
.stats { margin: 18px 0 0; font-size: 14px; color: var(--muted); }
.stats b { color: var(--ink); font-weight: 600; }
.stats span + span::before { content: "·"; margin: 0 10px; color: var(--line); }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; padding-top: 36px; padding-bottom: 48px; }
.side, .content { min-width: 0; }
.side-sticky { position: sticky; top: 78px; }
.side-title { font-size: 13px; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); font-family: var(--sans); font-weight: 600; margin: 0 0 10px; }
.topics { display: flex; flex-direction: column; gap: 2px; margin-bottom: 22px; }
.chip {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  font: inherit; font-size: 14.5px; text-align: left; padding: 7px 10px; border-radius: 8px; cursor: pointer;
  border: 0; background: transparent; color: var(--ink-2); width: 100%;
}
.chip:hover { background: var(--paper-2); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.chip .n { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.chip[aria-pressed="true"] .n { color: color-mix(in srgb, var(--paper) 70%, transparent); }
.toggle { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink-2); cursor: pointer; padding: 6px 10px; }
.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.toggle-ui { width: 34px; height: 20px; border-radius: 999px; background: var(--line); position: relative; transition: background .15s; flex: none; }
.toggle-ui::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: 50%; background: var(--card); box-shadow: 0 1px 2px rgba(0,0,0,.3); transition: transform .15s; }
.toggle input:checked + .toggle-ui { background: var(--free); }
.toggle input:checked + .toggle-ui::after { transform: translateX(14px); }
.toggle input:focus-visible + .toggle-ui { outline: 2px solid var(--accent); outline-offset: 2px; }
.side-note { font-size: 13px; color: var(--muted); margin: 18px 10px 0; line-height: 1.5; }

.content-head { display: flex; justify-content: space-between; align-items: baseline; min-height: 24px; margin-bottom: 4px; }
.count { font-size: 13px; color: var(--muted); }

/* ---------- groups ---------- */
.group { margin: 8px 0 40px; }
.group-head { display: flex; align-items: baseline; gap: 12px; margin: 0 0 16px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.group-head h2 { font-size: 26px; margin: 0; }
.group-head .n { font-size: 13px; color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(400px, 1fr)); gap: 18px; }

/* ---------- book card ---------- */
.book {
  display: grid; grid-template-columns: 104px 1fr; gap: 18px; padding: 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
}
.book:hover { transform: translateY(-2px); box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 18px 36px -18px rgba(40,30,10,.45); }
.grouped .book-topic { display: none; }

/* typographic cover */
.cover {
  display: flex; flex-direction: column; width: 104px; height: 152px; border-radius: 3px 7px 7px 3px; overflow: hidden; position: relative;
  background: var(--c); color: var(--cream); text-decoration: none;
  box-shadow: inset 5px 0 6px -4px rgba(0,0,0,.55), 0 2px 4px rgba(0,0,0,.18), 0 10px 18px -12px rgba(0,0,0,.6);
  transform: perspective(600px) rotateY(0); transition: transform .2s ease;
}
.book:hover .cover { transform: perspective(600px) rotateY(-6deg); }
.cover::before { content: ""; position: absolute; inset: 0; background:
  repeating-linear-gradient(135deg, rgba(255,255,255,.06) 0 2px, transparent 2px 9px); pointer-events: none; }
.cover-top { flex: 1; display: flex; flex-direction: column; justify-content: space-between; padding: 9px 9px 6px 12px; font-size: 8.5px; letter-spacing: .1em; text-transform: uppercase; opacity: .92; }
.cover-year { font-family: var(--serif); font-size: 22px; letter-spacing: 0; text-transform: none; opacity: .75; line-height: 1; }
.cover-band { background: var(--cream); color: #1c1b19; padding: 8px 8px 9px 12px; min-height: 62px; display: flex; flex-direction: column; justify-content: center; gap: 3px; }
.cover-title { font-family: var(--serif); font-weight: 600; font-size: 11.5px; line-height: 1.15; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.cover-author { font-size: 8px; text-transform: uppercase; letter-spacing: .08em; color: #5a564f; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.ribbon { position: absolute; top: 10px; right: -22px; transform: rotate(45deg); background: var(--free); color: #fff; font-size: 8.5px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; padding: 2px 26px; box-shadow: 0 1px 2px rgba(0,0,0,.3); }

.book-body { min-width: 0; display: flex; flex-direction: column; }
.book-topic { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin-bottom: 2px; }
.book-title { font-size: 19px; line-height: 1.2; margin: 0 0 4px; font-weight: 600; }
.book-title mark, .book-meta mark { background: var(--warn-bg); color: inherit; border-radius: 2px; padding: 0 1px; }
.book-meta { margin: 0 0 8px; font-size: 13.5px; color: var(--muted); }
.book-why { margin: 0 0 12px; font-size: 14px; color: var(--ink-2); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.book:hover .book-why { -webkit-line-clamp: unset; }
.book-links { display: flex; flex-wrap: wrap; gap: 6px; }
.lnk { font-size: 12.5px; font-weight: 500; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line); text-decoration: none; color: var(--ink-2); background: transparent; white-space: nowrap; transition: border-color .12s, background .12s; }
.lnk:hover { border-color: var(--ink-2); color: var(--ink); }
.lnk.free { background: var(--free-bg); color: var(--free); border-color: transparent; font-weight: 600; }
.lnk.free:hover { filter: brightness(.97); border-color: transparent; }
.lnk.free::before { content: "↓ "; }
.lnk.ext::after { content: " ↗"; opacity: .55; font-size: .9em; }

.empty { padding: 28px 0 8px; color: var(--muted); font-size: 16px; }
.empty strong { color: var(--ink); font-family: var(--serif); font-weight: 600; }

/* ---------- online results ---------- */
.online { margin: 12px 0 32px; padding: 22px 24px; border-radius: var(--r); background: var(--paper-2); border: 1px solid var(--line); }
.online h2 { margin: 0 0 4px; font-size: 22px; }
.online .sub { margin: 0 0 16px; color: var(--ink-2); font-size: 14px; }
.online-list { display: grid; gap: 10px; }
.hit { display: grid; grid-template-columns: 44px 1fr auto; gap: 14px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.hit .thumb { width: 44px; height: 64px; border-radius: 3px; background: var(--paper-2); object-fit: cover; }
.hit .thumb:not([src]) { visibility: hidden; }
.hit .t { font-family: var(--serif); font-weight: 600; font-size: 16.5px; line-height: 1.25; }
.hit .m { font-size: 13px; color: var(--muted); }
.hit .reasons { font-size: 12.5px; color: var(--ink-2); margin: 6px 0 0; padding-left: 16px; }
.badge { display: inline-block; font-family: var(--sans); font-size: 11px; font-weight: 600; letter-spacing: .02em; padding: 2px 8px; border-radius: 999px; margin-left: 8px; vertical-align: 2px; }
.badge.pass { color: var(--free); background: var(--free-bg); }
.badge.review { color: var(--warn); background: var(--warn-bg); }
.badge.reject { color: var(--bad); background: var(--bad-bg); }
.badge.dup { color: var(--muted); background: var(--paper-2); border: 1px solid var(--line); }
.btn { font: 600 13.5px var(--sans); padding: 9px 15px; border-radius: 10px; cursor: pointer; border: 1px solid transparent; background: var(--accent); color: var(--accent-ink); text-decoration: none; white-space: nowrap; }
.btn:hover { filter: brightness(1.06); }
.btn.secondary { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.secondary:hover { border-color: var(--ink-2); filter: none; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.spinner { display: inline-block; width: 13px; height: 13px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -2px; margin-right: 7px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- how / footer ---------- */
.how { border-top: 1px solid var(--line); background: var(--paper-2); padding: 56px 0 64px; }
.how h2 { font-size: 30px; margin: 0 0 28px; }
.how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 32px; }
.how .num { font-family: var(--serif); font-style: italic; color: var(--accent); font-size: 15px; }
.how h3 { font-size: 20px; margin: 4px 0 8px; }
.how p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
.how a { color: var(--accent); }
.site-footer { padding: 22px 0 44px; font-size: 13.5px; color: var(--muted); }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a { color: var(--ink-2); }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 20px; padding-top: 24px; }
  .side-sticky { position: static; }
  .side-title, .side-note { display: none; }
  .topics { flex-direction: row; flex-wrap: nowrap; overflow-x: auto; gap: 6px; padding-bottom: 6px; margin-bottom: 8px; scrollbar-width: none; }
  .topics::-webkit-scrollbar { display: none; }
  .chip { width: auto; white-space: nowrap; border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-size: 13.5px; }
  .chip[aria-pressed="true"] { border-color: var(--ink); }
  .toggle { padding-left: 2px; }
  .grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .hero { padding: 40px 0 28px; }
  .hero h1 { font-size: 34px; }
  .brand-name { font-size: 14.5px; white-space: nowrap; }
  .bar { gap: 10px; }
  .site-nav a:first-child { display: none; }
  .site-nav { gap: 12px; font-size: 13px; }
  .site-nav .sponsor { padding: 4px 9px; }
  .site-nav .sponsor svg { width: 13px; height: 13px; }
  .search input { padding: 14px 16px 14px 46px; font-size: 16px; }
  .search-kbd { display: none; }
  .book { grid-template-columns: 88px 1fr; gap: 14px; padding: 14px; }
  .cover { width: 88px; height: 130px; }
  .cover-band { min-height: 54px; }
  .book-title { font-size: 17px; }
  .hit { grid-template-columns: 1fr; }
  .hit .thumb { display: none; }
}