:root {
  --ink: #131313;
  --paper: #f4f2ec;
  --paper-2: #e9e6de;
  --signal: #ff4f2e;
  --muted: #706e68;
  --line: rgba(19, 19, 19, 0.18);
  --white: #fff;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; }
.skip-link { position: fixed; left: 1rem; top: -4rem; z-index: 100; background: var(--white); padding: .7rem 1rem; }
.skip-link:focus { top: 1rem; }

.site-header {
  height: 84px;
  padding: 0 clamp(1.25rem, 4vw, 4.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .75rem; font-weight: 700; letter-spacing: -.03em; }
.brand-mark {
  width: 34px; height: 34px; display: grid; place-items: center;
  color: var(--paper); background: var(--ink); font-size: .85rem;
}
.top-nav { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2.75rem); font-size: .9rem; font-weight: 500; }
.top-nav > a:not(.nav-login) { color: var(--muted); }
.top-nav > a:hover { color: var(--signal); }
.nav-login, .nav-logout button {
  border: 1px solid var(--ink); padding: .55rem 1rem; background: transparent; cursor: pointer;
}
.nav-logout { margin: 0; }
.nav-logout button:hover, .nav-login:hover { background: var(--ink); color: var(--paper) !important; }

.hero {
  min-height: calc(100vh - 84px);
  padding: clamp(3rem, 7vw, 7rem) clamp(1.25rem, 7vw, 7.5rem) 3rem;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background:
    linear-gradient(90deg, transparent calc(50% - .5px), var(--line) 50%, transparent calc(50% + .5px));
}
.hero-kicker, .eyebrow {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; font-weight: 500;
}
.hero-kicker { display: flex; align-items: center; gap: .65rem; }
.hero-kicker span { width: 8px; height: 8px; background: var(--signal); border-radius: 50%; }
.hero h1 {
  align-self: center;
  margin: 1.5rem 0;
  font-size: clamp(3.1rem, 8.7vw, 9.2rem);
  line-height: .98;
  letter-spacing: -.07em;
  font-weight: 800;
}
.hero h1 em { color: var(--signal); font-style: normal; position: relative; }
.hero h1 em::after { content: ""; position: absolute; left: 2%; right: -3%; bottom: .04em; height: .08em; background: var(--signal); }
.hero-bottom { display: flex; align-items: end; justify-content: space-between; gap: 2rem; }
.hero-bottom p { margin: 0; max-width: 31rem; color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.2rem); }
.round-link {
  width: 64px; height: 64px; display: grid; place-items: center; border-radius: 50%;
  background: var(--ink); color: var(--paper); font-size: 1.4rem; transition: transform .2s ease, background .2s ease;
}
.round-link:hover { transform: translateY(4px); background: var(--signal); }

.writing { padding: clamp(4rem, 9vw, 8rem) clamp(1.25rem, 7vw, 7.5rem); background: var(--ink); color: var(--paper); }
.section-heading { display: flex; justify-content: space-between; align-items: end; border-bottom: 1px solid rgba(255,255,255,.2); padding-bottom: 1.75rem; }
.section-heading h2 { margin: .5rem 0 0; font-size: clamp(2.2rem, 5vw, 4.8rem); letter-spacing: -.06em; line-height: 1; }
.entry-count { color: #aaa79f; font-family: var(--mono); font-size: .75rem; }
.post-grid { display: grid; grid-template-columns: repeat(2, 1fr); }
.post-card { min-height: 330px; padding: clamp(1.5rem, 3vw, 2.8rem); border-bottom: 1px solid rgba(255,255,255,.18); position: relative; }
.post-card:nth-child(odd) { border-right: 1px solid rgba(255,255,255,.18); }
.post-card.featured { grid-column: 1 / -1; min-height: 390px; padding-left: calc(50% + clamp(1.5rem, 3vw, 2.8rem)); }
.post-card.featured::before { content: "FEATURED"; position: absolute; left: 0; top: 2.8rem; font: 500 .7rem var(--mono); letter-spacing: .12em; color: var(--signal); }
.post-meta { display: flex; gap: .85rem; align-items: center; font: 500 .7rem var(--mono); letter-spacing: .08em; text-transform: uppercase; color: #aaa79f; }
.post-meta span { color: var(--signal); }
.post-card h3 { margin: 1.4rem 0 1rem; font-size: clamp(1.7rem, 3.4vw, 3.7rem); line-height: 1.15; letter-spacing: -.045em; }
.post-card:not(.featured) h3 { font-size: clamp(1.45rem, 2.4vw, 2.45rem); }
.post-card h3 a:hover { color: var(--signal); }
.post-card p { color: #aaa79f; max-width: 38rem; margin: 0; }
.read-link { display: inline-flex; gap: .5rem; margin-top: 2rem; border-bottom: 1px solid rgba(255,255,255,.35); font-size: .85rem; }
.read-link:hover { color: var(--signal); border-color: var(--signal); }
.empty-public { min-height: 330px; display: grid; grid-template-columns: 1fr 1fr; align-items: center; border-bottom: 1px solid rgba(255,255,255,.18); }
.empty-number { font-size: clamp(5rem, 14vw, 12rem); line-height: 1; color: #2b2b2b; font-weight: 800; letter-spacing: -.08em; }
.empty-public h3 { font-size: clamp(1.8rem, 3vw, 3rem); margin: 0 0 1rem; }
.empty-public p { color: #aaa79f; max-width: 34rem; }

.about { padding: clamp(5rem, 10vw, 10rem) clamp(1.25rem, 7vw, 7.5rem); display: grid; grid-template-columns: .35fr 1.25fr 1fr; gap: 3rem; }
.about-index { color: var(--signal); font-family: var(--mono); }
.about h2 { margin: 1rem 0 0; font-size: clamp(2.1rem, 4.4vw, 4.6rem); line-height: 1.12; letter-spacing: -.055em; }
.about-copy { align-self: end; color: var(--muted); max-width: 31rem; }
.about-copy p:last-child { margin-bottom: 0; }

.site-footer { padding: 1.25rem clamp(1.25rem, 4vw, 4.5rem); display: flex; justify-content: space-between; border-top: 1px solid var(--line); color: var(--muted); font: .72rem var(--mono); }

.login-shell { min-height: calc(100vh - 84px); display: grid; grid-template-columns: minmax(290px, .9fr) minmax(480px, 1.1fr); }
.login-aside { padding: clamp(3rem, 6vw, 6rem); background: var(--ink); color: var(--paper); display: flex; flex-direction: column; justify-content: space-between; }
.login-number { color: var(--signal); font: 1rem var(--mono); }
.login-aside blockquote { margin: auto 0; font-size: clamp(2.6rem, 5vw, 5.5rem); font-weight: 800; line-height: 1.08; letter-spacing: -.06em; }
.login-aside > p:last-child { color: #aaa79f; max-width: 22rem; }
.login-panel { padding: clamp(3rem, 8vw, 8rem); display: flex; flex-direction: column; justify-content: center; }
.login-heading { display: flex; align-items: center; gap: .6rem; font: .72rem var(--mono); letter-spacing: .12em; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 5px rgba(255,79,46,.13); }
.login-panel h1 { font-size: clamp(2.8rem, 5vw, 5rem); margin: 1.2rem 0 .25rem; letter-spacing: -.06em; line-height: 1; }
.login-panel > p { color: var(--muted); }
.auth-form { margin-top: 2rem; display: grid; gap: 1.35rem; max-width: 34rem; }
.auth-form label, .editor-form label { display: grid; gap: .55rem; }
.auth-form label > span, .editor-form label > span { font-size: .8rem; font-weight: 600; }
input, textarea { width: 100%; border: 1px solid var(--line); background: rgba(255,255,255,.45); color: var(--ink); padding: .9rem 1rem; border-radius: 0; }
input:focus, textarea:focus { border-color: var(--ink); outline: none; box-shadow: inset 3px 0 var(--signal); }
.auth-form button, .editor-actions button, .primary-button {
  border: 0; background: var(--signal); color: var(--white); padding: 1rem 1.25rem; display: inline-flex; justify-content: space-between; align-items: center; font-weight: 700; cursor: pointer;
}
.auth-form button:hover, .editor-actions button:hover, .primary-button:hover { background: #e63d1e; }
.login-note { font: .7rem var(--mono); margin-top: 1.5rem; }
.login-note span { color: #33a852; margin-right: .4rem; }
.form-error { background: #ffe1da; border-left: 3px solid var(--signal); padding: .8rem 1rem; margin-top: 1rem; }

.admin-shell, .editor-shell { padding: clamp(3rem, 7vw, 7rem) clamp(1.25rem, 7vw, 7.5rem); min-height: calc(100vh - 84px); }
.admin-hero, .editor-heading { display: flex; justify-content: space-between; align-items: end; gap: 2rem; }
.admin-hero h1, .editor-heading h1 { font-size: clamp(3rem, 7vw, 7.2rem); letter-spacing: -.07em; line-height: 1; margin: .75rem 0; }
.admin-hero p { color: var(--muted); }
.primary-button { gap: 1rem; white-space: nowrap; margin-bottom: .75rem; }
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); margin: 4rem 0 5rem; border: 1px solid var(--line); }
.stats-row div { padding: 1.5rem; display: flex; align-items: baseline; gap: 1rem; }
.stats-row div + div { border-left: 1px solid var(--line); }
.stats-row strong { font: 500 2.6rem var(--mono); }
.stats-row span { color: var(--muted); font-size: .8rem; }
.admin-list-header { display: flex; align-items: end; justify-content: space-between; padding-bottom: 1.2rem; border-bottom: 2px solid var(--ink); }
.admin-list-header h2 { margin: 0; font-size: 1.7rem; }
.admin-list-header > span { color: var(--muted); font-size: .75rem; }
.admin-row { display: grid; grid-template-columns: 60px 1fr auto auto; gap: 2rem; align-items: center; padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
.row-index { font: .75rem var(--mono); color: var(--muted); }
.row-main h3 { margin: .4rem 0 0; font-size: 1.25rem; }
.status-pill { font: .68rem var(--mono); padding: .35rem .65rem; border: 1px solid; }
.status-pill.published { color: #1d7a3b; border-color: rgba(29,122,59,.35); background: rgba(29,122,59,.07); }
.status-pill.draft { color: var(--muted); border-color: var(--line); }
.row-actions { display: flex; align-items: center; gap: 1rem; font-size: .78rem; }
.row-actions a:hover, .row-actions button:hover { color: var(--signal); }
.row-actions form { margin: 0; }
.row-actions button { border: 0; padding: 0; background: none; color: var(--muted); cursor: pointer; }
.admin-empty { min-height: 280px; display: grid; place-items: center; align-content: center; text-align: center; border-bottom: 1px solid var(--line); }
.admin-empty > span { color: var(--signal); font-size: 2rem; }
.admin-empty h3 { font-size: 1.7rem; margin: .6rem 0 0; }
.admin-empty p { color: var(--muted); }
.text-button { color: var(--signal); border-bottom: 1px solid; font-weight: 600; }

.editor-hint { color: var(--muted); font-size: .75rem; }
.editor-form { margin-top: 4rem; display: grid; gap: 2rem; }
.title-field input { font-size: clamp(1.5rem, 3vw, 2.8rem); font-weight: 700; letter-spacing: -.04em; padding: 1rem; }
.form-grid { display: grid; grid-template-columns: .4fr 1fr; gap: 1.5rem; }
.content-field textarea { min-height: 440px; resize: vertical; line-height: 1.85; }
.editor-actions { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 1.5rem; }
.editor-actions > div { display: flex; align-items: center; gap: 1.5rem; }
.publish-toggle { grid-template-columns: auto 1fr !important; align-items: center; cursor: pointer; }
.publish-toggle input { width: 19px; height: 19px; accent-color: var(--signal); }

.article-page { max-width: 980px; margin: 0 auto; padding: clamp(3rem, 8vw, 8rem) clamp(1.25rem, 4vw, 3rem); }
.back-link { font: .75rem var(--mono); color: var(--muted); }
.back-link:hover { color: var(--signal); }
.article-header { margin: clamp(3rem, 7vw, 6rem) 0 3rem; }
.article-header .post-meta { color: var(--muted); }
.article-header h1 { font-size: clamp(3rem, 7.5vw, 7.3rem); line-height: 1.03; letter-spacing: -.07em; margin: 1.5rem 0; }
.article-deck { font-size: 1.2rem; color: var(--muted); max-width: 45rem; }
.article-rule { border-top: 1px solid var(--ink); display: flex; justify-content: end; }
.article-rule span { margin-top: .6rem; font: .68rem var(--mono); letter-spacing: .12em; }
.article-body { max-width: 740px; margin: 4rem auto; white-space: pre-wrap; font-size: 1.08rem; line-height: 2; }
.article-footer { display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 1.3rem; font: .72rem var(--mono); color: var(--muted); }
.article-footer a { color: var(--signal); }

.not-found { min-height: calc(100vh - 84px); padding: clamp(4rem, 10vw, 9rem) clamp(1.25rem, 7vw, 7.5rem); }
.not-found > p { font: .75rem var(--mono); color: var(--signal); }
.not-found h1 { font-size: clamp(4rem, 12vw, 12rem); line-height: .9; letter-spacing: -.08em; margin: 2rem 0 4rem; }

@media (max-width: 800px) {
  .site-header { height: 70px; }
  .top-nav > a:not(.nav-login) { display: none; }
  .hero { min-height: calc(100svh - 70px); background: none; }
  .hero h1 { font-size: clamp(3.3rem, 16vw, 6rem); }
  .post-grid { grid-template-columns: 1fr; }
  .post-card, .post-card:nth-child(odd), .post-card.featured { grid-column: auto; border-right: 0; padding: 2rem 0; min-height: 300px; }
  .post-card.featured::before { display: none; }
  .empty-public { grid-template-columns: 1fr; padding: 2rem 0; }
  .about { grid-template-columns: 1fr; }
  .about-copy { align-self: auto; }
  .login-shell { grid-template-columns: 1fr; }
  .login-aside { min-height: 43vh; padding: 2rem 1.25rem; }
  .login-aside blockquote { margin: 2.5rem 0; font-size: 2.6rem; }
  .login-panel { padding: 4rem 1.25rem; }
  .admin-hero, .editor-heading { align-items: start; flex-direction: column; }
  .stats-row { margin: 2.5rem 0 4rem; }
  .stats-row div { display: grid; gap: 0; }
  .stats-row strong { font-size: 1.8rem; }
  .admin-row { grid-template-columns: 32px 1fr auto; gap: 1rem; }
  .row-actions { grid-column: 2 / -1; }
  .form-grid { grid-template-columns: 1fr; }
  .editor-actions { align-items: start; flex-direction: column; gap: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}