/* Primary Source — static, system fonts, no external assets */
:root {
  color-scheme: light dark;
  --paper: #f7f4ed;
  --paper-2: #efeade;
  --panel: #fffdf8;
  --ink: #16140f;
  --ink-2: #2b2821;
  --muted: #625d52;
  --line: #d8d0bf;
  --line-strong: #b9ae98;
  --accent: #a63a1b;
  --accent-2: #7c2a12;
  --accent-soft: #f3e2d9;
  --a: #1f5c3d;
  --a-soft: #e0ecdf;
  --b: #2b5680;
  --b-soft: #dfe8f1;
  --c: #625b4b;
  --c-soft: #e9e4d9;
  --d: #8a5a12;
  --d-soft: #f3e7cf;
  --e: #8c2f2f;
  --e-soft: #f3dede;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --shadow: 0 1px 0 rgba(22, 20, 15, .04), 0 10px 30px -22px rgba(22, 20, 15, .35);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14130f;
    --paper-2: #1a1813;
    --panel: #1c1a15;
    --ink: #f2ede1;
    --ink-2: #ded7c8;
    --muted: #b3ab9a;
    --line: #38342b;
    --line-strong: #534c3f;
    --accent: #f08a5d;
    --accent-2: #f5a17d;
    --accent-soft: #33211a;
    --a: #7fc39a;
    --a-soft: #1b2c23;
    --b: #8db7dc;
    --b-soft: #1b2835;
    --c: #c0b7a4;
    --c-soft: #2a2721;
    --d: #e0b169;
    --d-soft: #2f2617;
    --e: #e89494;
    --e-soft: #331e1e;
    --shadow: none;
  }
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  overflow-x: clip;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -.015em;
  line-height: 1.12;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--accent-2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

code {
  font-family: var(--mono);
  font-size: .86em;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: .08em .32em;
  overflow-wrap: anywhere;
}

blockquote { margin: 0; }

.wrap {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

@media (min-width: 720px) {
  .wrap { padding-left: 32px; padding-right: 32px; }
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 14px;
  z-index: 20;
}
.skip:focus { left: 12px; top: 12px; color: var(--paper); }

/* Header */
.site-head {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
}
.head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--ink);
  min-width: 0;
}
.brand:hover { color: var(--ink); }
.brand-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: .04em;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; min-width: 0; }
.brand-text strong { font-family: var(--serif); font-size: 19px; font-weight: 600; letter-spacing: -.01em; }
.brand-text small { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-top: 2px; }

.site-head nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  font-size: 13.5px;
  letter-spacing: .02em;
}
.site-head nav a {
  color: var(--ink-2);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
.site-head nav a:hover { border-bottom-color: var(--accent); color: var(--accent-2); }
.site-head nav a[aria-current="page"] { border-bottom-color: var(--ink); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-top: 44px;
  padding-bottom: 46px;
}
@media (min-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .95fr);
    gap: 54px;
    align-items: start;
    padding-top: 68px;
    padding-bottom: 58px;
  }
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(2.35rem, 7.2vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -.03em;
  margin-bottom: 20px;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent-2);
}
.lede {
  font-size: clamp(1.03rem, 1.8vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 34em;
}
.lede strong { color: var(--ink); }
.byline {
  font-size: 13px;
  color: var(--muted);
  margin-top: 16px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 17px;
  border: 1px solid var(--ink);
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  line-height: 1.3;
}
.btn:hover { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--accent-soft); color: var(--accent-2); border-color: var(--accent); }

.claim-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: 5px;
  padding: 22px 20px;
  box-shadow: var(--shadow);
  min-width: 0;
}
.claim-card .eyebrow { margin-bottom: 10px; }
.claim-quote {
  font-family: var(--serif);
  font-size: 1.16rem;
  line-height: 1.4;
  color: var(--ink);
  padding: 0 0 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
  text-wrap: pretty;
}
.claim-meta { margin: 0; display: grid; gap: 12px; }
.claim-meta div { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 10px; }
.claim-meta dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 4px;
}
.claim-meta dd { margin: 0; font-size: 13.5px; line-height: 1.5; color: var(--ink-2); overflow-wrap: break-word; }

/* Tier pills */
.tier-pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid currentColor;
  white-space: nowrap;
  line-height: 1.4;
  vertical-align: 1px;
}
.tier-a { color: var(--a); background: var(--a-soft); }
.tier-b { color: var(--b); background: var(--b-soft); }
.tier-c { color: var(--c); background: var(--c-soft); }
.tier-d { color: var(--d); background: var(--d-soft); }
.tier-e { color: var(--e); background: var(--e-soft); }

/* Rule strip */
.rule-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: 15px;
  padding-bottom: 15px;
  background: var(--paper-2);
}
.rule-strip p { margin: 0; font-size: 14px; color: var(--ink-2); max-width: 78em; }
.rule-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-2);
  border: 1px solid var(--accent);
  padding: 2px 6px;
  border-radius: 3px;
  margin-right: 10px;
  white-space: nowrap;
}

/* Sections */
.section { padding-top: 56px; padding-bottom: 20px; }
@media (min-width: 720px) { .section { padding-top: 76px; } }
.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 26px;
}
.section-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-2);
  padding-top: 8px;
  margin: 0;
}
.section-head h2 { font-size: clamp(1.65rem, 4vw, 2.35rem); margin-bottom: 8px; }
.section-sub { color: var(--muted); margin: 0; font-size: 14.5px; max-width: 52em; }

/* Ladder */
.ladder { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.ladder li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 800px) {
  .ladder li { grid-template-columns: 48px minmax(0, 1fr) 120px; align-items: start; }
}
.tier-badge {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 4px;
  font-family: var(--serif);
  font-size: 19px;
  border: 1px solid currentColor;
}
.ladder-body h3 { font-size: 1.22rem; margin-bottom: 6px; }
.ladder-body p { margin: 0; color: var(--ink-2); font-size: 15px; line-height: 1.55; max-width: 60em; }
.tier-note {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .07em;
  text-transform: uppercase;
  font-weight: 400;
  color: var(--muted);
  margin-left: 8px;
  vertical-align: 2px;
}
.ladder-mark {
  grid-column: 2;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .05em;
  color: var(--muted);
}
@media (min-width: 800px) {
  .ladder-mark { grid-column: 3; text-align: right; padding-top: 10px; }
}

.conflict-panel {
  margin-top: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  padding: 22px 20px;
}
.conflict-panel h3 { font-size: 1.45rem; margin-bottom: 10px; }
.conflict-panel p { font-size: 15px; color: var(--ink-2); max-width: 62em; }
.conflict-panel .small { font-size: 13px; color: var(--muted); margin-top: 10px; }
.small { font-size: 13px; color: var(--muted); }

/* Latest */
.issue-banner {
  display: block;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--paper-2);
  padding: 18px 20px;
  text-decoration: none;
  color: var(--ink);
  margin-bottom: 22px;
}
.issue-banner:hover { border-color: var(--accent); color: var(--ink); }
.issue-banner strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.28rem;
  line-height: 1.25;
  margin: 4px 0 6px;
  max-width: 40em;
}
.issue-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.issue-detail { display: block; font-size: 14px; color: var(--ink-2); max-width: 62em; }
.issue-zh {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-top: 8px;
  line-height: 1.55;
}

.card-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
@media (min-width: 880px) {
  .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 20px 18px;
  min-width: 0;
  box-shadow: var(--shadow);
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.card-meta {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
  line-height: 1.9;
}
.card h3 { font-size: 1.2rem; line-height: 1.22; margin-bottom: 10px; }
.card h3 a { color: var(--ink); text-decoration: none; }
.card h3 a:hover { color: var(--accent-2); text-decoration: underline; }
.card p { font-size: 14.5px; color: var(--ink-2); line-height: 1.55; }
.zh {
  font-size: 13px !important;
  color: var(--muted) !important;
  border-left: 2px solid var(--line-strong);
  padding-left: 10px;
  line-height: 1.6 !important;
}
.card-src {
  font-size: 12px !important;
  color: var(--muted) !important;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.archive-line { margin-top: 18px; font-size: 14px; color: var(--muted); }

.watch-list {
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 18px 20px;
  background: transparent;
}
.watch-list .eyebrow { margin-bottom: 8px; }
.watch-list ul { margin: 0; padding-left: 1.1em; }
.watch-list li { font-size: 14px; color: var(--ink-2); margin-bottom: 6px; }
.watch-list li:last-child { margin-bottom: 0; }

/* Correction log */
.log-entry {
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--panel);
  overflow: hidden;
}
.log-head {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-2);
}
.log-date {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 6px;
}
.log-head h3 { font-size: clamp(1.3rem, 3vw, 1.65rem); }
.log-body { margin: 0; padding: 18px 20px 6px; display: grid; gap: 16px; }
@media (min-width: 760px) {
  .log-body { grid-template-columns: 150px minmax(0, 1fr); gap: 0 22px; padding-top: 22px; }
}
.log-body div { display: grid; gap: 4px; }
@media (min-width: 760px) {
  .log-body div { grid-column: 1 / -1; grid-template-columns: 150px minmax(0, 1fr); gap: 22px; padding-bottom: 16px; }
}
.log-body dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 4px;
}
.log-body dd { margin: 0; font-size: 15px; color: var(--ink-2); max-width: 60em; }
.log-lesson {
  margin: 0;
  padding: 16px 20px;
  border-top: 1px solid var(--line);
  background: var(--accent-soft);
  font-size: 14px;
  color: var(--ink-2);
}
.log-lesson strong { color: var(--ink); }

/* Method teaser */
.check-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}
@media (min-width: 760px) {
  .check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 36px; }
}
.check-grid li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.check-grid span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-2);
  padding-top: 3px;
}
.check-grid p { margin: 0; font-size: 14.5px; color: var(--ink-2); }
.method-link { margin-top: 24px; }

/* Subscribe */
#subscribe { padding-bottom: 60px; }
.subscribe-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  padding: 26px 20px;
}
@media (min-width: 820px) {
  .subscribe-box { grid-template-columns: minmax(0, 1.3fr) minmax(0, .8fr); gap: 40px; padding: 34px 32px; }
}
.subscribe-box h2 { color: var(--paper); font-size: clamp(1.5rem, 3.5vw, 2rem); margin-bottom: 8px; }
.subscribe-box p { color: color-mix(in srgb, var(--paper) 78%, transparent); font-size: 14.5px; }
.subscribe-box .eyebrow { color: color-mix(in srgb, var(--paper) 60%, transparent); }
.subscribe-box a { color: var(--paper); text-decoration-color: color-mix(in srgb, var(--paper) 50%, transparent); }
.subscribe-box a:hover { color: #fff; }
.feed-url {
  font-family: var(--mono);
  font-size: 12.5px;
  background: color-mix(in srgb, var(--paper) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--paper) 22%, transparent);
  border-radius: 3px;
  padding: 9px 11px;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.feed-url a { text-decoration: none; }
.subscribe-box .small { color: color-mix(in srgb, var(--paper) 62%, transparent); }
.elsewhere ul { list-style: none; margin: 0; padding: 0; }
.elsewhere li { padding: 12px 0; border-top: 1px solid color-mix(in srgb, var(--paper) 18%, transparent); }
.elsewhere li:first-child { border-top: 0; padding-top: 0; }
.elsewhere a { display: block; font-family: var(--serif); font-size: 1.08rem; text-decoration: none; }
.elsewhere a:hover { text-decoration: underline; }
.elsewhere span { display: block; font-size: 12.5px; color: color-mix(in srgb, var(--paper) 62%, transparent); margin-top: 3px; line-height: 1.5; }

/* Method page */
.page-head { padding-top: 48px; padding-bottom: 26px; }
.page-head h1 { font-size: clamp(2.1rem, 6vw, 3.4rem); letter-spacing: -.028em; margin-bottom: 14px; }
.method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}
.method-list li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 760px) {
  .method-list li { grid-template-columns: 64px minmax(0, 1fr); gap: 24px; padding: 30px 0; }
}
.method-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-2);
  padding-top: 6px;
}
.method-body h2 { font-size: clamp(1.25rem, 2.6vw, 1.55rem); margin-bottom: 10px; }
.method-body p { font-size: 15px; color: var(--ink-2); max-width: 64em; line-height: 1.62; }
.method-body .action strong { color: var(--ink); }
.method-body .why { font-size: 14px; color: var(--muted); border-left: 2px solid var(--line-strong); padding-left: 12px; }
.method-body .why strong { color: var(--ink-2); }

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
@media (min-width: 760px) { .two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; } }
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 20px;
}
.panel p { font-size: 14.5px; color: var(--ink-2); }
.plain-list { margin: 0; padding-left: 1.15em; }
.plain-list li { font-size: 14.5px; color: var(--ink-2); margin-bottom: 7px; }
.plain-list li:last-child { margin-bottom: 0; }

.back-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  padding: 24px 0;
  margin-bottom: 40px;
}
.back-panel p { margin: 0; font-family: var(--serif); font-size: clamp(1.15rem, 2.6vw, 1.5rem); font-style: italic; color: var(--ink-2); }

/* Footer */
.site-foot {
  border-top: 1px solid var(--line-strong);
  background: var(--paper-2);
  padding-top: 26px;
  padding-bottom: 30px;
}
.site-foot p { font-size: 13px; color: var(--muted); max-width: 80em; }
.site-foot strong { color: var(--ink-2); }
.site-foot .small { font-size: 12px; margin-top: 10px; }
.site-foot a { color: var(--ink-2); }
.site-foot a:hover { color: var(--accent-2); }