@import url('https://fonts.googleapis.com/css2?family=Calistoga:ital@0;1&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* =====================
   CSS 自定义属性
   ===================== */
:root {
  --c-bg: #fafaf8;
  --c-mid: #4a4a4a;
  --c-ink: #1a1a1a;
  --c-border: #1a1a1a;
  --c-muted: #6a6a6a;
  --c-accent: #d4a843;
  --c-paper: #f0efe9;
  --c-paper2: #e8e7e0;

  --ff-display: 'Calistoga', Georgia, serif;
  --ff-body: 'Inter', system-ui, sans-serif;
  --ff-mono: 'JetBrains Mono', monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.25rem;
  --fs-3xl: 3rem;
  --fs-hero: clamp(2.5rem, 7vw, 5.5rem);
  --fs-bg-text: clamp(5rem, 18vw, 14rem);

  --lh-tight: 1.2;
  --lh-normal: 1.6;
  --lh-loose: 1.8;

  --space-xs: 0.375rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;

  --nav-height: 44px;
  --header-offset: 120px;
  --border-w: 2px;
  --border-heavy: 3px;
}

/* =====================
   重置 & 基础
   ===================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background: var(--c-bg);
  color: var(--c-ink);
}

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  background: var(--c-bg);
  color: var(--c-ink);
  overflow-x: hidden;
  position: relative;
}

/* 纸纹覆盖层 */
.paper-grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.04;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(26,26,26,0.08) 2px,
      rgba(26,26,26,0.08) 3px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 4px,
      rgba(26,26,26,0.04) 4px,
      rgba(26,26,26,0.04) 5px
    );
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-decoration-style: wavy; }
ul, ol { list-style: none; }

hr {
  border: none;
  border-top: var(--border-w) solid var(--c-ink);
  margin: var(--space-md) 0;
  transform: rotate(-0.3deg);
}

/* =====================
   排版基础
   ===================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--ff-display);
  line-height: var(--lh-tight);
  color: var(--c-ink);
}

h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }

p { margin-bottom: var(--space-md); }
p:last-child { margin-bottom: 0; }

/* =====================
   公告条
   ===================== */
.header-announce {
  background: var(--c-ink);
  color: var(--c-bg);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  padding: 6px var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  justify-content: center;
  text-align: center;
}

.announce-mark {
  color: var(--c-accent);
  font-size: 0.9em;
}

/* =====================
   Header
   ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--c-bg);
  border-bottom: var(--border-heavy) solid var(--c-ink);
}

.header-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-lg);
  border-bottom: var(--border-w) solid var(--c-paper2);
}

.header-brand-inner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand-logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.brand-logo-link:hover { text-decoration: none; }

.brand-logo-text {
  font-family: var(--ff-display);
  font-size: var(--fs-xl);
  color: var(--c-ink);
  transform: rotate(-1deg);
  display: inline-block;
}

.brand-logo-img {
  height: 40px;
  width: auto;
}

.brand-tagline {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--c-muted);
  letter-spacing: 0.06em;
  margin-bottom: 0;
  max-width: 28ch;
}

.header-deco {
  display: flex;
  align-items: center;
}

.deco-stamp {
  font-family: var(--ff-display);
  font-size: var(--fs-lg);
  color: var(--c-paper2);
  letter-spacing: 0.3em;
  transform: rotate(8deg);
  border: var(--border-w) solid var(--c-paper2);
  padding: 2px 8px;
  display: inline-block;
}

/* =====================
   导航行 nav > ol > li > a
   ===================== */
.header-nav-row {
  background: var(--c-paper);
  padding: 0 var(--space-lg);
}

.main-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.main-nav ol > li {
  position: relative;
}

.main-nav ol > li > a {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  padding: 0 var(--space-md);
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--c-ink);
  border-right: 1px solid var(--c-paper2);
  white-space: nowrap;
  min-height: 44px;
  transition: none;
}

.main-nav ol > li > a:hover {
  background: var(--c-ink);
  color: var(--c-bg);
  text-decoration: none;
}

.main-nav ol > li:first-child > a {
  border-left: 1px solid var(--c-paper2);
}

/* =====================
   Hero
   ===================== */
.hero-section {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: var(--space-xl) var(--space-lg);
  border-bottom: var(--border-heavy) solid var(--c-ink);
  overflow: hidden;
  background: var(--c-bg);
}

.hero-bg-text {
  position: absolute;
  left: -0.05em;
  top: 50%;
  transform: translateY(-55%);
  font-family: var(--ff-display);
  font-size: var(--fs-bg-text);
  color: var(--c-paper2);
  letter-spacing: -0.02em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: right;
  max-width: 70%;
}

.hero-eyebrow {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-muted);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.hero-h1 {
  font-family: var(--ff-display);
  font-size: var(--fs-hero);
  line-height: 1.05;
  color: var(--c-ink);
  margin-bottom: var(--space-md);
  word-break: break-all;
}

.hero-sub {
  font-size: var(--fs-md);
  color: var(--c-mid);
  line-height: var(--lh-normal);
  max-width: 40ch;
  margin-left: auto;
}

.hero-scratch {
  width: 80px;
  height: 3px;
  background: var(--c-ink);
  margin: var(--space-md) 0 0 auto;
  transform: rotate(-1.5deg);
}

/* =====================
   主内容区
   ===================== */
.site-main {
  padding: var(--space-xl) 0;
}

/* main > section.wrap > div > article 四层嵌套 */
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.content-section {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-xl);
  align-items: start;
}

.content-article {
  min-width: 0;
}

.article-body {
  font-size: var(--fs-base);
  line-height: var(--lh-loose);
  color: var(--c-ink);
}

/* 正文内 div（page.content 里的 div） */
.article-body div {
  margin-bottom: var(--space-2xl);
  scroll-margin-top: var(--header-offset);
}

.article-body h2 {
  font-family: var(--ff-display);
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-sm);
  transform: rotate(-0.2deg);
  display: inline-block;
}

.article-body h2 + hr {
  margin-top: 0;
  margin-bottom: var(--space-lg);
}

.article-body h3 {
  font-family: var(--ff-display);
  font-size: var(--fs-xl);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.article-body p {
  margin-bottom: var(--space-md);
  color: var(--c-mid);
}

.article-body ul {
  list-style: none;
  margin-bottom: var(--space-md);
}

.article-body ul > li {
  padding-left: var(--space-md);
  position: relative;
  margin-bottom: var(--space-sm);
  color: var(--c-mid);
}

.article-body ul > li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--c-ink);
  font-weight: 700;
}

.article-body ol {
  list-style: none;
  counter-reset: article-ol;
  margin-bottom: var(--space-md);
}

.article-body ol > li {
  counter-increment: article-ol;
  padding-left: calc(var(--space-md) + 1.5em);
  position: relative;
  margin-bottom: var(--space-sm);
  color: var(--c-mid);
}

.article-body ol > li::before {
  content: counter(article-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--ff-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--c-ink);
}

.article-body a {
  color: var(--c-ink);
  text-decoration: underline;
  text-decoration-style: wavy;
  text-underline-offset: 3px;
}

.article-body a:hover {
  background: var(--c-ink);
  color: var(--c-bg);
  text-decoration: none;
  padding: 0 2px;
}

.article-body strong {
  font-weight: 700;
  color: var(--c-ink);
}

.article-body blockquote {
  border-left: var(--border-heavy) solid var(--c-ink);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--c-mid);
}

/* div 间分隔 */
.article-body div + div {
  border-top: var(--border-w) solid var(--c-paper2);
  padding-top: var(--space-xl);
}

/* div id scroll offset */
div[id] { scroll-margin-top: var(--header-offset); }

/* =====================
   Aside
   ===================== */
.content-aside {
  position: sticky;
  top: calc(var(--header-offset) + var(--space-md));
}

.aside-inner {
  border: var(--border-heavy) solid var(--c-ink);
  padding: var(--space-md);
  background: var(--c-paper);
  transform: rotate(0.4deg);
}

.aside-title {
  font-family: var(--ff-display);
  font-size: var(--fs-lg);
  margin-bottom: var(--space-sm);
  transform: none;
}

.aside-nav-list {
  counter-reset: aside-nav;
}

.aside-nav-list > li {
  counter-increment: aside-nav;
  border-bottom: 1px solid var(--c-paper2);
}

.aside-nav-list > li:last-child {
  border-bottom: none;
}

.aside-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  font-size: var(--fs-sm);
  color: var(--c-mid);
  min-height: 44px;
}

.aside-nav-link:hover {
  color: var(--c-ink);
  text-decoration: none;
  font-weight: 600;
}

.aside-num {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--c-ink);
  min-width: 2.5ch;
  flex-shrink: 0;
}

.aside-note {
  margin-top: var(--space-md);
  font-size: var(--fs-xs);
  color: var(--c-muted);
  line-height: var(--lh-normal);
  border-top: 1px dashed var(--c-paper2);
  padding-top: var(--space-sm);
}

/* =====================
   Footer 联系块
   ===================== */
.footer-form-block {
  background: var(--c-paper);
  border-top: var(--border-heavy) solid var(--c-ink);
  border-bottom: var(--border-w) solid var(--c-paper2);
  padding: var(--space-xl) var(--space-lg);
}

.footer-form-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-form-title {
  font-family: var(--ff-display);
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-sm);
}

.footer-form-desc {
  color: var(--c-mid);
  margin-bottom: var(--space-md);
}

.footer-contacts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-contact-item {
  font-family: var(--ff-mono);
  font-size: var(--fs-sm);
  color: var(--c-ink);
  border: var(--border-w) solid var(--c-ink);
  padding: var(--space-xs) var(--space-sm);
}

/* =====================
   Footer 主体 (logo + nav 横排)
   ===================== */
.site-footer {
  border-top: var(--border-heavy) solid var(--c-ink);
  background: var(--c-bg);
}

.footer-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.footer-logo-wrap {
  margin-bottom: var(--space-md);
}

.footer-logo-img {
  height: 36px;
  width: auto;
}

.footer-brand-text {
  font-family: var(--ff-display);
  font-size: var(--fs-xl);
  color: var(--c-ink);
}

.footer-desc {
  font-size: var(--fs-sm);
  color: var(--c-muted);
  line-height: var(--lh-normal);
}

.footer-nav-title {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--c-muted);
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  border-bottom: var(--border-w) solid var(--c-paper2);
  padding-bottom: var(--space-xs);
}

.footer-col-nav ol {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.footer-col-nav ol > li > a {
  display: block;
  padding: var(--space-xs) 0;
  font-size: var(--fs-sm);
  color: var(--c-mid);
  border-bottom: 1px solid var(--c-paper2);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.footer-col-nav ol > li > a:hover {
  color: var(--c-ink);
  font-weight: 600;
  text-decoration: none;
}

.footer-bottom {
  border-top: var(--border-w) solid var(--c-paper2);
  padding: var(--space-md) var(--space-lg);
  text-align: center;
}

.footer-copy {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--c-muted);
  letter-spacing: 0.05em;
}

/* =====================
   动效 (stagger + hover micro)
   ===================== */
@media (prefers-reduced-motion: no-preference) {
  .main-nav ol > li {
    opacity: 0;
    transform: translateY(-6px);
    animation: navStagger 0.3s ease forwards;
  }

  .main-nav ol > li:nth-child(1) { animation-delay: 0.05s; }
  .main-nav ol > li:nth-child(2) { animation-delay: 0.1s; }
  .main-nav ol > li:nth-child(3) { animation-delay: 0.15s; }
  .main-nav ol > li:nth-child(4) { animation-delay: 0.2s; }
  .main-nav ol > li:nth-child(5) { animation-delay: 0.25s; }
  .main-nav ol > li:nth-child(6) { animation-delay: 0.3s; }
  .main-nav ol > li:nth-child(7) { animation-delay: 0.35s; }

  @keyframes navStagger {
    to { opacity: 1; transform: translateY(0); }
  }

  .article-body div {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
  }

  .article-body div.visible {
    opacity: 1;
    transform: none;
  }

  .aside-inner {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }
  .aside-inner:hover {
    transform: rotate(0deg) translateY(-2px);
    box-shadow: 4px 4px 0 var(--c-ink);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* =====================
   移动端断点
   ===================== */
@media (max-width: 768px) {
  :root {
    --fs-hero: clamp(2rem, 10vw, 3.5rem);
    --fs-bg-text: clamp(4rem, 22vw, 8rem);
    --header-offset: 100px;
  }

  .header-brand-row {
    padding: var(--space-sm) var(--space-md);
  }

  .brand-tagline {
    display: none;
  }

  .deco-stamp {
    display: none;
  }

  .header-nav-row {
    padding: 0 var(--space-sm);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .main-nav ol {
    flex-wrap: nowrap;
    min-width: max-content;
  }

  .main-nav ol > li > a {
    padding: 0 var(--space-sm);
    font-size: var(--fs-xs);
  }

  .hero-section {
    padding: var(--space-lg) var(--space-md);
    min-height: auto;
    justify-content: flex-end;
  }

  .hero-inner {
    max-width: 100%;
  }

  .wrap {
    padding: 0 var(--space-md);
  }

  .content-section {
    grid-template-columns: 1fr;
  }

  .content-aside {
    position: static;
    order: -1;
  }

  .aside-inner {
    transform: none;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-md);
  }

  .footer-form-block {
    padding: var(--space-lg) var(--space-md);
  }

  .footer-contacts {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: clamp(1.75rem, 9vw, 2.5rem);
  }

  .article-body h2 {
    font-size: var(--fs-xl);
  }
}