@import url('https://fonts.googleapis.com/css2?family=Karla:wght@300;400;500;600;700&family=Playfair+Display+SC:wght@400;700&display=swap');

/* ===========================
   CSS 变量 & 基础重置
   =========================== */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-gray-100: #f5f5f5;
  --c-gray-200: #e8e8e8;
  --c-gray-400: #999999;
  --c-gray-600: #555555;
  --c-accent: #000000;

  --font-head: 'Playfair Display SC', Georgia, serif;
  --font-body: 'Karla', system-ui, -apple-system, sans-serif;

  --nav-h: 64px;
  --max-w: 1200px;
  --gap: 2rem;
  --gap-sm: 1rem;
  --gap-lg: 4rem;

  --transition-fast: 200ms ease;
  --transition-mid: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-black);
  background: var(--c-white);
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol {
  list-style: none;
}

/* ===========================
   导航
   =========================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--c-white);
  border-bottom: 1px solid var(--c-black);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  height: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--gap);
}

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

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

.logo-text {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-black);
}

.site-nav {
  display: flex;
  justify-content: center;
}

.site-nav ol {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: center;
}

.site-nav ol li a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.site-nav ol li a:hover,
.site-nav ol li a:focus-visible {
  background: var(--c-black);
  color: var(--c-white);
  border-color: var(--c-black);
  outline: none;
}

.header-contact {
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--c-black);
  padding-bottom: 2px;
}

/* ===========================
   scroll-margin for sections
   =========================== */
div[id] {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

/* ===========================
   Hero
   =========================== */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: stretch;
  padding-top: var(--nav-h);
}

.hero-article {
  width: 100%;
  position: relative;
  display: grid;
  grid-template-rows: 1fr;
  align-items: center;
  min-height: calc(100vh - var(--nav-h));
  overflow: hidden;
}

/* 网格底纹 */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(0,0,0,0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,0,0,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 0;
  pointer-events: none;
}

/* 错位拼贴图片 */
.hero-collage {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero-img {
  position: absolute;
  object-fit: cover;
}

.hero-img--a {
  width: 45%;
  height: 70%;
  top: 8%;
  right: 4%;
  border: 3px solid var(--c-black);
}

.hero-img--b {
  width: 32%;
  height: 52%;
  bottom: 6%;
  right: 20%;
  border: 3px solid var(--c-black);
  transform: translateX(2rem) translateY(1rem);
}

.hero-collage__deco {
  position: absolute;
  width: 280px;
  height: 280px;
  top: 12%;
  right: 28%;
  border: 2px solid var(--c-black);
  opacity: 0.12;
  transform: rotate(6deg);
  pointer-events: none;
}

/* Hero 文案 */
.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 560px;
  padding: var(--gap-lg) var(--gap);
  margin-left: clamp(1rem, 6vw, 6rem);
}

.hero-h1 {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-black);
  margin-bottom: 1.25rem;
}

.hero-lead {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--c-gray-600);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 420px;
}

.hero-cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===========================
   按钮
   =========================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 1.75rem;
  background: var(--c-black);
  color: var(--c-white);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 2px solid var(--c-black);
  border-radius: 0;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--c-white);
  color: var(--c-black);
  outline: none;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 1.75rem;
  background: transparent;
  color: var(--c-black);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 2px solid var(--c-black);
  border-radius: 0;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--c-black);
  color: var(--c-white);
  outline: none;
}

.btn-large {
  height: 56px;
  padding: 0 2.5rem;
  font-size: 1rem;
}

/* ===========================
   主体区域：两列布局
   =========================== */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.content-section {
  padding: var(--gap-lg) 0;
  border-top: 1px solid var(--c-black);
}

.content-article {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--gap-lg);
  align-items: start;
}

/* ===========================
   Aside
   =========================== */
.content-aside {
  position: sticky;
  top: calc(var(--nav-h) + 2rem);
  border-top: 4px solid var(--c-black);
  padding-top: 1.25rem;
}

.content-aside h2 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 0.375rem;
}

.content-aside .subtitle {
  font-size: 0.8125rem;
  color: var(--c-gray-600);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.aside-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.aside-nav li a {
  display: block;
  padding: 0.625rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  border-bottom: 1px solid var(--c-gray-200);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  line-height: 1.4;
}

.aside-nav li a:hover,
.aside-nav li a:focus-visible {
  color: var(--c-gray-600);
  padding-left: 0.5rem;
  outline: none;
}

.aside-brand-line {
  height: 2px;
  background: var(--c-black);
  margin: 1.5rem 0 1rem;
  width: 40px;
}

.aside-tagline {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.6;
  color: var(--c-gray-400);
}

/* ===========================
   正文内容 (page.content 注入)
   =========================== */
.content-body {
  min-width: 0;
}

.content-body h1,
.content-body h2,
.content-body h3,
.content-body h4 {
  font-family: var(--font-head);
  line-height: 1.2;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

.content-body h1 { font-size: 2rem; }
.content-body h2 {
  font-size: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--c-black);
}
.content-body h3 { font-size: 1.2rem; }
.content-body h4 { font-size: 1rem; letter-spacing: 0.04em; }

.content-body p {
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-black);
}

.content-body ul,
.content-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

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

.content-body li {
  margin-bottom: 0.5rem;
  font-size: 1rem;
  line-height: 1.7;
}

.content-body a {
  border-bottom: 1px solid var(--c-black);
  transition: opacity var(--transition-fast);
}

.content-body a:hover {
  opacity: 0.6;
}

.content-body blockquote {
  border-left: 4px solid var(--c-black);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--c-gray-100);
  font-style: italic;
}

.content-body div {
  margin-bottom: 4rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--c-gray-200);
}

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

.content-body img {
  max-width: 100%;
  border: 2px solid var(--c-black);
  margin: 1.5rem 0;
}

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

.content-body th {
  background: var(--c-black);
  color: var(--c-white);
  padding: 0.625rem 1rem;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.content-body td {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--c-gray-200);
}

.content-body tr:hover td {
  background: var(--c-gray-100);
}

/* 卡片底部强调线 */
.content-body .card,
.content-body article.card {
  border: 1px solid var(--c-gray-200);
  border-radius: 0;
  padding: 1.5rem;
  position: relative;
  border-bottom: 3px solid var(--c-black);
  transition: border-color var(--transition-fast);
}

.content-body .card:hover {
  border-color: var(--c-black);
}

/* ===========================
   页脚
   =========================== */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  margin-top: var(--gap-lg);
}

.footer-cta {
  padding: 5rem var(--gap);
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer-cta-inner {
  max-width: 560px;
  margin: 0 auto;
}

.footer-cta h2 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.75rem;
  line-height: 1.15;
}

.footer-cta .subtitle {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.footer-cta .btn-primary {
  background: var(--c-white);
  color: var(--c-black);
  border-color: var(--c-white);
}

.footer-cta .btn-primary:hover,
.footer-cta .btn-primary:focus-visible {
  background: transparent;
  color: var(--c-white);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3.5rem var(--gap);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer-col h3 {
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-white);
  margin-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.2);
  padding-bottom: 0.75rem;
}

.footer-col p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.6);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-col ul li a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition-fast);
  display: block;
  padding: 0.25rem 0;
  min-height: 40px;
  display: flex;
  align-items: center;
}

.footer-col ul li a:hover,
.footer-col ul li a:focus-visible {
  color: var(--c-white);
  outline: none;
}

.footer-brand .footer-logo-link {
  display: inline-block;
  margin-bottom: 1rem;
  filter: invert(1);
}

.footer-brand .logo-text {
  color: var(--c-white);
  font-size: 1.125rem;
}

.footer-bottom {
  text-align: center;
  padding: 1.5rem var(--gap);
  background: rgba(0,0,0,0.4);
}

.footer-copy {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.02em;
}

/* ===========================
   工具类
   =========================== */
.subtitle {
  color: var(--c-gray-600);
  font-size: 1rem;
  line-height: 1.6;
}

/* ===========================
   并行动效
   =========================== */
.hero-img--a,
.hero-img--b {
  transition: transform var(--transition-mid);
}

@media (hover: hover) {
  .hero-collage:hover .hero-img--a {
    transform: translateY(-4px);
  }
  .hero-collage:hover .hero-img--b {
    transform: translateX(2rem) translateY(-3px);
  }
}

/* ===========================
   响应式
   =========================== */
@media (max-width: 1024px) {
  .footer-cols {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-img--a {
    width: 55%;
  }

  .hero-img--b {
    width: 40%;
  }
}

@media (max-width: 768px) {
  :root {
    --gap: 1.25rem;
    --gap-lg: 2.5rem;
    --nav-h: 56px;
  }

  .header-inner {
    grid-template-columns: auto 1fr;
    gap: 0.75rem;
  }

  .header-contact {
    display: none;
  }

  .site-nav ol {
    gap: 0.125rem;
  }

  .site-nav ol li a {
    padding: 0 0.625rem;
    font-size: 0.75rem;
    height: 40px;
  }

  .hero-copy {
    margin-left: 0;
    padding: 2rem var(--gap);
    max-width: 100%;
  }

  .hero-h1 {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .hero-collage {
    display: none;
  }

  .hero-grid-bg {
    background-size: 32px 32px;
  }

  .hero-article {
    min-height: calc(100svh - var(--nav-h));
    display: flex;
    align-items: center;
  }

  .content-article {
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
  }

  .content-aside {
    position: static;
    border-top: 4px solid var(--c-black);
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: var(--gap);
  }

  .footer-cta {
    padding: 3rem var(--gap);
  }
}

@media (max-width: 480px) {
  .hero-cta-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn-primary,
  .btn-ghost {
    width: 100%;
    justify-content: center;
  }

  .footer-cols {
    grid-template-columns: 1fr;
  }

  .site-nav {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .site-nav ol {
    flex-wrap: nowrap;
    padding-bottom: 4px;
  }
}

/* ===========================
   焦点可及性
   =========================== */
:focus-visible {
  outline: 2px solid var(--c-black);
  outline-offset: 2px;
}

.page-home .site-footer :focus-visible {
  outline-color: var(--c-white);
}