@import url('https://fonts.googleapis.com/css2?family=Space+Mono:ital,wght@0,400;0,700;1,400;1,700&display=swap');

/* ============================================================
   CSS 变量 & 重置
   ============================================================ */
:root {
  --blue: #3bb1ff;
  --red: #ff5252;
  --black: #000000;
  --white: #ffffff;
  --yellow: #ffe94d;
  --bg: #f5f5f0;
  --border: 3px solid var(--black);
  --shadow: 5px 5px 0 var(--black);
  --shadow-sm: 3px 3px 0 var(--black);
  --shadow-lg: 8px 8px 0 var(--black);
  --font: 'Space Mono', 'Courier New', monospace;
  --nav-h: 64px;
  --transition: 0.15s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 8px);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body, .nb-body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   全局元素
   ============================================================ */
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }

img { max-width: 100%; display: block; }
ul, ol, menu { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font);
  font-weight: 700;
  line-height: 1.2;
}

hr {
  border: none;
  border-top: 3px solid var(--black);
  margin: 1rem 0;
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65em 1.4em;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: var(--border);
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  white-space: nowrap;
  min-height: 44px;
}

.btn-primary {
  background: var(--blue);
  color: var(--black);
  box-shadow: var(--shadow);
}

.btn-outline {
  background: var(--white);
  color: var(--black);
  box-shadow: var(--shadow);
}

.btn:hover {
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(3px, 3px);
  text-decoration: none;
}

.btn:active {
  box-shadow: none;
  transform: translate(5px, 5px);
}

/* ============================================================
   站点容器
   ============================================================ */
.site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   顶部导航栏
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: var(--border);
  box-shadow: 0 3px 0 var(--black);
  height: var(--nav-h);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-link:hover { text-decoration: none; }

.brand-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border: 2px solid var(--black);
}

.brand-name { color: var(--black); font-size: 1rem; }

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* 搜索框 */
.search-wrap {
  display: flex;
  align-items: center;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--white);
  overflow: hidden;
}

.search-input {
  font-family: var(--font);
  font-size: 0.85rem;
  border: none;
  outline: none;
  padding: 0.45em 0.75em;
  background: transparent;
  min-width: 140px;
  color: var(--black);
}

.search-input::placeholder { color: #777; }

.search-btn {
  background: var(--blue);
  border: none;
  border-left: var(--border);
  padding: 0.45em 0.65em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  min-width: 40px;
  transition: background var(--transition);
}

.search-btn:hover { background: var(--red); }

/* 汉堡按钮 */
.burger-btn {
  background: var(--yellow);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  width: 48px;
  height: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
  flex-shrink: 0;
  padding: 0.5em;
}

.burger-btn:hover {
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(3px, 3px);
}

.burger-bar {
  display: block;
  width: 22px;
  height: 3px;
  background: var(--black);
  transition: transform var(--transition), opacity var(--transition);
}

/* ============================================================
   导航遮罩（details > summary + menu > li > a）
   ============================================================ */
.nav-details {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  pointer-events: none;
}

.nav-details[open] {
  pointer-events: auto;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: var(--blue);
  border-left: var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  transform: translateX(-100%);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.nav-details[open] .nav-overlay {
  opacity: 1;
  transform: translateX(0);
}

.nav-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: var(--red);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  color: var(--white);
  font-family: var(--font);
  font-size: 1.2rem;
  font-weight: 700;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
}

.nav-close:hover {
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(3px, 3px);
}

.nav-overlay-inner {
  text-align: center;
  padding: 2rem;
  width: 100%;
  max-width: 480px;
}

.nav-overlay-brand {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--black);
  margin-bottom: 2rem;
  opacity: 0.15;
  user-select: none;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.nav-menu li {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-details[open] .nav-menu li {
  opacity: 1;
  transform: translateY(0);
  transition-delay: calc(var(--i, 0) * 0.05s + 0.1s);
}

.nav-menu a {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--black);
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 0.5em 1.5em;
  text-decoration: none;
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
}

.nav-menu a:hover {
  background: var(--yellow);
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(3px, 3px);
  text-decoration: none;
}

/* ============================================================
   Hero 区域（左图右文，满屏100vh）
   ============================================================ */
.hero-section {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: var(--white);
  border-bottom: var(--border);
  overflow: hidden;
}

.hero-bg-text {
  position: absolute;
  bottom: -0.1em;
  left: -0.05em;
  font-size: clamp(6rem, 22vw, 20rem);
  font-weight: 700;
  letter-spacing: -0.06em;
  color: var(--blue);
  opacity: 0.07;
  user-select: none;
  pointer-events: none;
  line-height: 1;
  white-space: nowrap;
}

.hero-layout {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100svh;
}

.hero-media {
  position: relative;
  align-self: center;
}

.hero-img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  border: var(--border);
  box-shadow: var(--shadow-lg);
  display: block;
}

.hero-placeholder {
  width: 100%;
  aspect-ratio: 4/5;
  background: var(--blue);
  border: var(--border);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
}

.hero-content {
  text-align: right;
  align-self: center;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  background: var(--red);
  color: var(--white);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  display: inline-block;
  padding: 0.25em 0.75em;
  margin-bottom: 1.25rem;
}

.hero-h1 {
  font-size: clamp(1.8rem, 4.5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
  color: var(--black);
}

.hero-desc {
  font-size: 1rem;
  line-height: 1.65;
  color: #333;
  margin-bottom: 2rem;
  max-width: 480px;
  margin-left: auto;
}

.hero-cta-group {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* ============================================================
   正文主体（main > div > figure/aside 交错）
   ============================================================ */
.site-main {
  flex: 1;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 2.5rem 1.5rem;
}

/* 默认：figure 左、aside 右、content-body 跨底部 */
.content-section {
  display: grid;
  grid-template-columns: 1fr 240px;
  grid-template-rows: auto 1fr;
  gap: 2rem;
  align-items: start;
}

.content-figure {
  grid-column: 1;
  grid-row: 1;
}

.content-aside {
  grid-column: 2;
  grid-row: 1 / 3;
  background: var(--yellow);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  position: sticky;
  top: calc(var(--nav-h) + 1rem);
}

.content-body {
  grid-column: 1;
  grid-row: 2;
}

/* ============================================================
   Aside 样式
   ============================================================ */
.aside-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.aside-nav-list li a {
  display: flex;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.45em 0.6em;
  border: 2px solid transparent;
  min-height: 40px;
  transition: background var(--transition), border-color var(--transition);
}

.aside-nav-list li a:hover {
  background: var(--black);
  color: var(--yellow);
  border-color: var(--black);
  text-decoration: none;
}

.aside-badge {
  background: var(--red);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  padding: 0.5em 0.75em;
  display: flex;
  flex-direction: column;
  gap: 0.2em;
}

.badge-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--white);
}

.badge-text {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--white);
}

/* ============================================================
   Figure 装饰块
   ============================================================ */
.figure-deco {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-top: var(--border);
  border-bottom: var(--border);
}

.figure-num {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: var(--blue);
  line-height: 1;
  min-width: 3ch;
}

.figure-block {
  flex: 1;
  height: 48px;
  background: var(--blue);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.figure-block::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 6px;
  right: -6px;
  bottom: -6px;
  background: var(--red);
  z-index: -1;
  border: var(--border);
}

/* ============================================================
   正文内容排版
   ============================================================ */
.content-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-top: 2.5rem;
  margin-bottom: 0.25rem;
  padding-left: 0.75rem;
  border-left: 6px solid var(--red);
}

.content-body h2 + hr {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.content-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.content-body h3 + hr {
  margin-top: 0;
  margin-bottom: 1rem;
}

.content-body p {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 1rem;
  color: #1a1a1a;
}

.content-body ul, .content-body ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.content-body ol { list-style: decimal; }

.content-body li {
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 0.35rem;
}

.content-body a {
  color: var(--black);
  font-weight: 700;
  border-bottom: 2px solid var(--blue);
  text-decoration: none;
}

.content-body a:hover {
  background: var(--blue);
  border-bottom-color: var(--black);
  text-decoration: none;
}

.content-body strong { font-weight: 700; }
.content-body em { font-style: italic; }

.content-body blockquote {
  border-left: 6px solid var(--blue);
  padding: 0.75rem 1rem;
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  margin: 1.5rem 0;
  font-style: italic;
}

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.content-body th, .content-body td {
  border: 2px solid var(--black);
  padding: 0.6em 0.8em;
  text-align: left;
}

.content-body th {
  background: var(--black);
  color: var(--white);
  font-weight: 700;
}

.content-body tr:nth-child(even) td { background: #f0f0ea; }

.content-body div {
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 2px dashed var(--black);
}

.content-body div:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.content-body div[id] {
  scroll-margin-top: calc(var(--nav-h) + 12px);
}

/* ============================================================
   页脚（footer 三列 dl）
   ============================================================ */
.site-footer {
  background: var(--black);
  color: var(--white);
  border-top: var(--border);
  margin-top: auto;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-col {
  border: 2px solid rgba(255,255,255,0.2);
  padding: 1.25rem;
  box-shadow: 4px 4px 0 var(--blue);
}

.footer-col dt {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(255,255,255,0.2);
}

.footer-col dd {
  font-size: 0.85rem;
  line-height: 1.6;
  color: #ccc;
  margin-bottom: 0.35rem;
}

.footer-col dd a {
  color: #ccc;
  border-bottom: 1px solid rgba(255,255,255,0.3);
  text-decoration: none;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-col dd a:hover {
  color: var(--white);
  border-bottom-color: var(--blue);
  text-decoration: none;
}

.footer-bottom {
  border-top: 2px solid rgba(255,255,255,0.15);
  text-align: center;
  padding: 1.25rem 1.5rem;
}

.copyright {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.35rem;
}

.footer-note {
  font-size: 0.75rem;
  color: #888;
  line-height: 1.5;
}

/* ============================================================
   卡片
   ============================================================ */
.card {
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  border-radius: 10px;
  border-bottom: 5px solid var(--red);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(3px, 3px);
}

/* ============================================================
   动效
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .hero-h1 {
    animation: fadeUp 0.5s ease both;
    animation-delay: 0.1s;
  }
  .hero-desc {
    animation: fadeUp 0.5s ease both;
    animation-delay: 0.2s;
  }
  .hero-cta-group {
    animation: fadeUp 0.5s ease both;
    animation-delay: 0.3s;
  }
  .hero-media {
    animation: fadeUp 0.5s ease both;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  .content-body div {
    animation: fadeIn 0.4s ease both;
  }

  @keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
  }
}

/* ============================================================
   响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .hero-layout { gap: 2rem; }
  .footer-inner { gap: 1.5rem; }
}

@media (max-width: 768px) {
  :root { --nav-h: 60px; }

  /* Hero：移动端单列，h1 在首屏 */
  .hero-section {
    align-items: flex-start;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    padding-top: calc(var(--nav-h) + 1rem);
    padding-bottom: 2rem;
    gap: 1.5rem;
    min-height: 100vh;
    min-height: 100svh;
    align-content: center;
  }

  /* 移动端：文案列先渲染（h1 在首屏顶部） */
  .hero-content {
    order: -1;
    text-align: left;
  }

  .hero-media {
    order: 1;
  }

  .hero-h1 {
    font-size: clamp(1.6rem, 7vw, 2.2rem);
  }

  .hero-eyebrow { margin-bottom: 0.75rem; }
  .hero-cta-group { justify-content: flex-start; }
  .hero-desc { margin-left: 0; max-width: 100%; }

  .hero-bg-text {
    font-size: 5rem;
    opacity: 0.05;
  }

  /* 正文容器：移动端单列 */
  .content-section {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .content-figure {
    grid-column: 1;
    grid-row: auto;
  }

  .content-aside {
    grid-column: 1;
    grid-row: auto;
    position: static;
  }

  .content-body {
    grid-column: 1;
    grid-row: auto;
  }

  .search-input { min-width: 80px; font-size: 0.8rem; }

  .footer-inner { grid-template-columns: 1fr; gap: 1.25rem; }

  .nav-menu a { font-size: 1.1rem; padding: 0.5em 1.2em; }
  .nav-overlay-brand { font-size: 2rem; }

  .content-body h2 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .header-inner { padding: 0 0.75rem; }
  .site-main { padding: 1.5rem 0.75rem; }
  .hero-layout { padding-left: 0.75rem; padding-right: 0.75rem; }
  .footer-inner { padding: 2rem 0.75rem 1.5rem; }
  .search-wrap { display: none; }
}

button[aria-expanded]{min-width:44px;min-height:44px}