/* ============================================================
   小路笔记 · 一人公司文章站 styles.css
   多页静态站 · 移动优先 · 自动暗色
   ============================================================ */

/* ---------- 1. Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body,
h1,
h2,
h3,
h4,
p,
ul,
ol,
li,
figure,
blockquote,
pre {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- 2. Design Tokens ---------- */
:root {
  --bg: #faf7f2;
  --surface: #ffffff;
  --surface-soft: #f3eee5;
  --text: #1f1d1a;
  --text-muted: #6b665f;
  --text-soft: #94897a;
  --border: #e8e2d6;
  --border-strong: #d6cebe;

  --accent: #c2410c;
  --accent-soft: #fed7aa;
  --accent-ink: #9a3412;

  --font-serif: "Source Han Serif SC", "Songti SC", "Noto Serif CJK SC",
    "Songti TC", Georgia, "Times New Roman", ui-serif, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Menlo, Consolas,
    monospace;

  --measure: 36rem;
  --content-pad: 1.25rem;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-soft: 0 2px 4px rgba(31, 29, 26, .04),
                 0 12px 32px -16px rgba(31, 29, 26, .18);

  --progress-from: #f97316;
  --progress-to:   #c2410c;

  --nav-h: 44px;
  --header-h: 56px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14110d;
    --surface: #1d1915;
    --surface-soft: #251f19;
    --text: #f0ebe3;
    --text-muted: #a39e96;
    --text-soft: #746f68;
    --border: #2f2820;
    --border-strong: #4a4136;
    --accent: #f97316;
    --accent-soft: #43271b;
    --accent-ink: #fdba74;
    --shadow-soft: 0 2px 4px rgba(0, 0, 0, .35),
                   0 12px 32px -16px rgba(0, 0, 0, .55);
    --progress-from: #fb923c;
    --progress-to:   #ea580c;
  }
}

/* ---------- 3. Typography base ---------- */
html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.8;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--accent-soft);
  color: var(--accent-ink);
}

/* ---------- 4. Layout ---------- */
.page {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--content-pad) 4rem;
}

/* ---------- 5. Top header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 var(--content-pad);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--accent);
  color: var(--bg);
  font-family: Georgia, var(--font-serif);
  font-style: italic;
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
}

.brand-text { letter-spacing: 0.02em; }

/* ---------- 6. Multi-page horizontal nav ---------- */
.site-nav--bar {
  position: sticky;
  top: var(--header-h);
  z-index: 25;
  display: flex;
  gap: 0.2rem;
  padding: 0 var(--content-pad);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  scrollbar-width: none;
}
.site-nav--bar::-webkit-scrollbar { display: none; }

.site-nav--bar a.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: var(--nav-h);
  padding: 0 0.6rem;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

.site-nav--bar a.nav-link:hover {
  color: var(--accent);
}

.site-nav--bar a.nav-link.is-current {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- 7. Progress bar ---------- */
.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  background: transparent;
  z-index: 40;
  pointer-events: none;
}
.progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--progress-from), var(--progress-to));
  transition: width 60ms linear;
  will-change: width;
}

/* ---------- 8. Hero (home) ---------- */
.hero {
  padding: 3rem 0 2rem;
  text-align: center;
}

.hero__kicker {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 2.4vw + 1rem, 2.55rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--text);
  margin-bottom: 1rem;
  text-wrap: balance;
}

.hero__subtitle {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 32rem;
  margin: 0 auto 1.5rem;
  font-style: italic;
}

.hero__meta {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.4rem 0.6rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.hero__author {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  color: var(--text);
}

.avatar {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  font-family: Georgia, var(--font-serif);
  font-style: italic;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
}

.hero__dot { color: var(--text-soft); }

/* ---------- 9. Sub-hero (chapter pages) ---------- */
.sub-hero {
  text-align: center;
  padding: 2.5rem 0 1.5rem;
}

.sub-hero__part {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.sub-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 2vw + 0.9rem, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.3;
  color: var(--text);
  text-wrap: balance;
  margin-bottom: 0.6rem;
}

.sub-hero__sub {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-muted);
  font-style: italic;
  max-width: 28rem;
  margin: 0 auto;
}

/* ---------- 10. Home: intro + TOC cards ---------- */
.intro {
  margin: 1rem 0 0.5rem;
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--text);
  font-weight: 500;
  text-align: center;
  text-indent: 0;
}

.rule {
  border: 0;
  height: 1px;
  background: var(--border);
  margin: 1.75rem auto;
  width: 4rem;
}

.section-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 2.5rem 0 1rem;
  text-align: center;
}

.toc-cards {
  display: grid;
  gap: 1rem;
  margin: 0 0 2rem;
}

.toc-cards .card {
  display: block;
  padding: 1.3rem 1.4rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: transform 200ms ease, border-color 200ms ease,
              box-shadow 200ms ease;
}

.toc-cards .card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.toc-cards .card__num {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  display: inline-block;
  margin-bottom: 0.4rem;
}

.toc-cards .card h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 1.35;
  margin: 0 0 0.4rem;
  color: var(--text);
}

.toc-cards .card p {
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--text-muted);
  margin: 0 0 0.8rem;
  text-indent: 0;
}

.toc-cards .card__cta {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
}

/* ---------- 11. Article body ---------- */
.article { padding: 1.5rem 0 2rem; }

.article__lede {
  margin: 1rem 0 0.5rem;
  font-size: 1.18rem;
  line-height: 1.75;
  color: var(--text);
  font-weight: 500;
}

.article__section { margin-top: 2.5rem; scroll-margin-top: 80px; }

.article__section h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.4rem, 1.2vw + 0.9rem, 1.7rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0 0 1.1rem;
  text-wrap: balance;
}

.sec-num {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-right: 0.5rem;
  vertical-align: 0.18em;
}

.article__section h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--text);
  margin: 1.75rem 0 0.75rem;
}

.article__section p {
  margin: 0 0 1.1rem;
  line-height: 1.85;
  color: var(--text);
}
.article__section p + p { text-indent: 2em; }
.article__lede + .rule + .article__section p,
.article__lede + .rule + .article__section p + p { text-indent: 0; }

.article__section ul,
.article__section ol {
  margin: 0.5rem 0 1.3rem;
  padding-left: 0;
}

.article__section ul li,
.article__section ol li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.55rem;
  line-height: 1.8;
  color: var(--text);
}

.article__section ul li::before {
  content: "·";
  position: absolute;
  left: 0.4rem;
  top: -0.05em;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--accent);
}

.article__section ol { counter-reset: ol-counter; }
.article__section ol li { counter-increment: ol-counter; }
.article__section ol li::before {
  content: counter(ol-counter);
  position: absolute;
  left: 0;
  top: 0.1em;
  width: 1.3rem;
  height: 1.3rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--surface-soft);
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
}

strong { font-weight: 700; color: var(--text); }
em     { font-style: italic; color: var(--text); }

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.12em 0.4em;
  border-radius: 5px;
  background: var(--surface-soft);
  color: var(--accent-ink);
}

pre {
  margin: 1rem 0 1.4rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.7;
}
pre code {
  background: transparent; padding: 0; color: var(--text); border-radius: 0;
}

/* ---------- 12. Blockquote & callout ---------- */
blockquote {
  margin: 1.5rem 0;
  padding: 0.4rem 0 0.4rem 1.2rem;
  border-left: 3px solid var(--accent);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text);
}
blockquote p + p { margin-top: 0.5rem; text-indent: 0; }

.callout {
  margin: 1.2rem 0;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}
.callout p { margin: 0; font-style: italic; color: var(--text-muted); text-indent: 0; }

/* ---------- 13. Timeline ---------- */
.timeline {
  margin: 1.4rem 0 1.6rem;
  padding: 0.4rem 0 0.4rem 1rem;
  border-left: 2px dashed var(--border-strong);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.timeline__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.8rem;
  align-items: start;
  position: relative;
}
.timeline__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 0.5rem;
  margin-left: -1.46rem;
  box-shadow: 0 0 0 4px var(--bg);
}
.timeline__step h4 {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 0.2rem;
  letter-spacing: 0.04em;
}
.timeline__step p { margin: 0; font-size: 0.97rem; line-height: 1.7; color: var(--text); text-indent: 0; }

.list-dont li::before {
  content: "✕";
  color: var(--accent);
  font-size: 0.8rem;
  left: 0.2rem;
  top: 0.3em;
}

/* ---------- 14. Prev/Next navigation ---------- */
.prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin: 2.5rem 0 1rem;
}

.prev-next__btn {
  display: block;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: border-color 200ms ease, transform 200ms ease,
              box-shadow 200ms ease;
  min-height: 64px;
}

.prev-next__btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

.prev-next__btn--prev { text-align: left; }
.prev-next__btn--next {
  text-align: right;
  grid-column: 2;
  grid-row: 1;
}

.prev-next:has(> :only-child) > .prev-next__btn--solo,
.prev-next:has(> :only-child) > .prev-next__btn--next,
.prev-next:has(> :only-child) > .prev-next__btn--prev {
  grid-column: 1 / -1;
  grid-row: 1;
}

.prev-next__label {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--text-soft);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}
.prev-next__title {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
  text-wrap: balance;
}
.prev-next__btn:hover .prev-next__title { color: var(--accent); }

/* ---------- 15. Byline & footer ---------- */
.byline {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: center;
  margin: 3rem 0 1.5rem;
  padding: 1.4rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}
.avatar--lg { width: 52px; height: 52px; font-size: 26px; }

.byline__name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 0.15rem;
}
.byline__role {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
  font-style: italic;
}
.byline__links {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  color: var(--text-muted);
}
.byline__links a {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: border-color 180ms ease;
}
.byline__links a:hover { border-bottom-color: var(--accent); }
.byline__links span { color: var(--text-soft); }

.end-mark {
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--text-soft);
  margin: 2rem 0 0.5rem;
  text-indent: 0;
}

.page-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-soft);
}

/* ---------- 16. About page extras ---------- */
.about-grid {
  display: grid;
  gap: 1.4rem;
  margin: 1rem 0 2rem;
}

.about-card {
  padding: 1.2rem 1.3rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.about-card h3 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.about-card p { margin: 0 0 0.6rem; text-indent: 0; }
.about-card p:last-child { margin-bottom: 0; }

.about-card ul { display: flex; flex-direction: column; gap: 0.4rem; }
.about-card ul li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.95rem;
  line-height: 1.6;
}
.about-card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 1.5px;
  background: var(--accent);
  border-radius: 1px;
}

.subscribe {
  margin-top: 2rem;
  padding: 1.4rem;
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.subscribe h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--accent-ink);
}
.subscribe p { margin: 0 0 1rem; font-style: italic; text-indent: 0; }
.subscribe__input {
  display: flex;
  gap: 0.5rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 0.4rem;
  border: 1px solid color-mix(in srgb, var(--accent-ink) 25%, transparent);
}
.subscribe__input input {
  flex: 1;
  border: 0;
  background: transparent;
  font: inherit;
  color: var(--text);
  padding: 0.4rem 0.6rem;
  outline: none;
}
.subscribe__input button {
  background: var(--accent);
  color: var(--bg);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  transition: opacity 150ms ease;
}
.subscribe__input button:hover { opacity: 0.88; }
.subscribe__hint { margin-top: 0.6rem; font-size: 0.78rem; font-style: normal; }

/* ---------- 17. Responsive: 大屏微调 ---------- */
@media (min-width: 640px) {
  :root { --content-pad: 2rem; }
  .article { padding-top: 2.5rem; }
  .hero { padding-top: 4.5rem; }
  .sub-hero { padding-top: 4rem; }
  .toc-cards { grid-template-columns: 1fr 1fr; gap: 1.2rem; }
  .toc-cards .card.full { grid-column: 1 / -1; }
}

@media (min-width: 880px) {
  .toc-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.4rem;
  }
}

/* ---------- 18. 可访问性:减少动画 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ---------- 19. 焦点态 ---------- */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}