/* ============================================================
   xxxm.dev — 共享设计系统
   Newsreader (display) / Commissioner (body) / IBM Plex Mono (data)
   ============================================================ */

:root {
  --paper:      #faf9f5;
  --paper-sunk: #f4f2ec;
  --ink:        #141413;
  --ink-muted:  #6b6b63;
  --ink-faint:  #b0aea5;
  --clay:       #d97757;
  --rule:       rgba(20, 20, 19, 0.09);
  --rule-firm:  rgba(20, 20, 19, 0.16);
  --focus:      #d97757;
  --danger:     #a8422a;

  --font-display: "Newsreader", Georgia, "Songti SC", serif;
  --font-body:    "Commissioner", -apple-system, BlinkMacSystemFont,
                  "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 62ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #141413;
    --paper-sunk: #1c1c1a;
    --ink:        #f0eee7;
    --ink-muted:  #9a988f;
    --ink-faint:  #5f5e57;
    --clay:       #c96a4d;
    --rule:       rgba(240, 238, 231, 0.11);
    --rule-firm:  rgba(240, 238, 231, 0.2);
    --focus:      #e08a6b;
    --danger:     #e08a6b;
  }
}
:root[data-theme="dark"] {
  --paper: #141413; --paper-sunk: #1c1c1a; --ink: #f0eee7;
  --ink-muted: #9a988f; --ink-faint: #5f5e57; --clay: #c96a4d;
  --rule: rgba(240,238,231,.11); --rule-firm: rgba(240,238,231,.2);
  --focus: #e08a6b; --danger: #e08a6b;
}
:root[data-theme="light"] {
  --paper: #faf9f5; --paper-sunk: #f4f2ec; --ink: #141413;
  --ink-muted: #6b6b63; --ink-faint: #b0aea5; --clay: #d97757;
  --rule: rgba(20,20,19,.09); --rule-firm: rgba(20,20,19,.16);
  --focus: #d97757; --danger: #a8422a;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100svh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 380;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- 背景呼吸层 ---------- */
#breath {
  position: fixed; inset: 0; z-index: -1;
  width: 100%; height: 100%; display: block; pointer-events: none;
}
.breath-fallback {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(46vmax 46vmax at 84% 14%, rgba(217,119,87,.17), transparent 66%),
    radial-gradient(40vmax 40vmax at 12% 90%, rgba(20,20,19,.12), transparent 66%);
}

/* ---------- 排版基元 ---------- */
.label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.rule {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .2em;
  color: var(--ink-faint);
  white-space: nowrap;
  overflow: hidden;
  user-select: none;
  border-top: 1px solid var(--rule);
  padding: 1.1rem 0 .35rem;
  -webkit-mask-image: linear-gradient(90deg, #000 78%, transparent 100%);
          mask-image: linear-gradient(90deg, #000 78%, transparent 100%);
}
.rule b { font-weight: 500; color: var(--clay); }
@media (min-width: 640px) { .rule { letter-spacing: .34em; } }

/* ---------- 文字链接 ---------- */
.link {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1.5rem; padding: .8rem 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink); text-decoration: none;
  transition: color .28s ease;
}
.link-name { position: relative; }
.link-name::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -.18em;
  height: 1px; background: var(--clay);
  transform: scaleX(0); transform-origin: left;
  transition: transform .38s cubic-bezier(.22,.61,.36,1);
}
.link-meta {
  font-family: var(--font-mono); font-size: .75rem;
  color: var(--ink-muted); white-space: nowrap;
  transition: color .28s ease, transform .38s cubic-bezier(.22,.61,.36,1);
}
.link:hover .link-name::after, .link:focus-visible .link-name::after { transform: scaleX(1); }
.link:hover .link-meta, .link:focus-visible .link-meta { transform: translateX(3px); }

/* ---------- 表单控件 ---------- */
.field {
  width: 100%;
  font-family: var(--font-body); font-size: 1rem; color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-firm); border-radius: 2px;
  padding: .7rem .85rem;
  transition: border-color .25s ease;
}
.field:focus { outline: none; border-color: var(--clay); }
.field::placeholder { color: var(--ink-faint); }

.btn {
  font-family: var(--font-mono); font-size: .75rem;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--paper); background: var(--ink);
  border: 1px solid var(--ink); border-radius: 2px;
  padding: .65rem 1.3rem; cursor: pointer;
  transition: opacity .2s ease;
}
.btn:hover { opacity: .82; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-ghost {
  color: var(--ink-muted); background: transparent; border-color: var(--rule-firm);
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-muted); opacity: 1; }
.btn-danger { color: var(--danger); background: transparent; border-color: var(--danger); }

.notice {
  font-family: var(--font-mono); font-size: .75rem;
  padding: .6rem .8rem; border-radius: 2px; border: 1px solid;
}
.notice-error { color: var(--danger); border-color: var(--danger); background: transparent; }
.notice-ok    { color: var(--ink-muted); border-color: var(--rule-firm); }

/* ---------- Markdown 正文 ---------- */
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.15em; }
.prose h1, .prose h2, .prose h3 {
  font-family: var(--font-display); font-weight: 400;
  line-height: 1.25; letter-spacing: -.015em;
  text-wrap: balance; margin-top: 2em;
}
.prose h1 { font-size: 1.9rem; }
.prose h2 { font-size: 1.5rem; }
.prose h3 { font-size: 1.22rem; }
.prose p, .prose li { color: var(--ink); }
.prose a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--clay); text-underline-offset: .18em; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li + li { margin-top: .4em; }
.prose blockquote {
  margin-left: 0; padding-left: 1.1rem;
  border-left: 2px solid var(--clay); color: var(--ink-muted);
}
.prose code {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--paper-sunk); padding: .12em .38em; border-radius: 2px;
}
.prose pre {
  background: var(--paper-sunk); padding: 1rem 1.1rem; border-radius: 3px;
  overflow-x: auto; border: 1px solid var(--rule);
}
.prose pre code { background: none; padding: 0; font-size: .82rem; line-height: 1.65; }
.prose img { max-width: 100%; height: auto; }
.prose hr { border: none; border-top: 1px solid var(--rule); margin: 2.4em 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: .94rem; }
.prose th, .prose td { text-align: left; padding: .5rem .7rem; border-bottom: 1px solid var(--rule); }
.prose th { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-muted); }

/* ---------- 可访问性 ---------- */
:focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; border-radius: 1px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 10;
  background: var(--paper); color: var(--ink); padding: .75rem 1.25rem;
  font-family: var(--font-mono); font-size: .75rem;
}
.skip:focus { left: 1rem; top: 1rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}