@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

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

html {
  scroll-behavior: smooth;
  font-size: 18px;
  background: #ffffff;
  color: #1f1f1f;
}

body {
  font-family: 'EB Garamond', 'Crimson Text', 'Georgia', 'Songti SC', '宋体', serif;
  line-height: 1.7;
  min-height: 100vh;
  background: #ffffff;
  overflow-x: hidden;
}

/* ===== Elevation Scale ===== */
:root {
  --shadow-sm: 0 2px 8px rgba(31,31,31,0.07), 0 1px 2px rgba(31,31,31,0.05);
  --shadow-md: 0 6px 20px rgba(31,31,31,0.10), 0 2px 6px rgba(31,31,31,0.07);
  --shadow-lg: 0 16px 40px rgba(31,31,31,0.13), 0 4px 12px rgba(31,31,31,0.08);
  --shadow-xl: 0 32px 64px rgba(31,31,31,0.18), 0 8px 24px rgba(31,31,31,0.10);
  --clr-white: #ffffff;
  --clr-surface: #f5f5f5;
  --clr-ink: #1f1f1f;
  --clr-ink-60: rgba(31,31,31,0.6);
  --clr-ink-30: rgba(31,31,31,0.3);
  --clr-border: rgba(31,31,31,0.15);
  --radius-card: 28px;
  --nav-h: 68px;
  --announce-h: 36px;
}

/* ===== Scroll margin for anchored sections ===== */
article[id] {
  scroll-margin-top: calc(var(--nav-h) + var(--announce-h) + 16px);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.90);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
}

.header-announce {
  height: var(--announce-h);
  background: var(--clr-ink);
  color: var(--clr-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-family: 'EB Garamond', serif;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--clr-ink);
}

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

.brand-name {
  font-family: 'EB Garamond', serif;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--clr-ink);
}

/* Nav: header > nav > p > a */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.site-nav p {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav p a {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.85rem;
  min-height: 40px;
  font-family: 'EB Garamond', serif;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--clr-ink);
  text-decoration: none;
  border-radius: 6px;
  letter-spacing: 0.03em;
  transition: background 0.18s, color 0.18s;
  position: relative;
}

.site-nav p a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0.85rem;
  right: 0.85rem;
  height: 1px;
  background: var(--clr-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s cubic-bezier(.4,0,.2,1);
}

.site-nav p a:hover {
  background: var(--clr-surface);
}

.site-nav p a:hover::after {
  transform: scaleX(1);
}

/* ===== Hero ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  background: var(--clr-ink);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hero-inner {
  flex: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 7rem 2rem 6rem;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-text-wrap {
  grid-column: 2;
  text-align: right;
}

.hero-eyebrow {
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: rgba(255,255,255,0.55);
  font-family: 'EB Garamond', serif;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.hero-title {
  font-family: 'EB Garamond', serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 6vw, 5.5rem);
  line-height: 1.08;
  color: var(--clr-white);
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.70);
  line-height: 1.75;
  max-width: 42ch;
  margin-left: auto;
}

/* Hero decoration cards (dimensional layering) */
.hero-deco {
  grid-column: 1;
  grid-row: 1;
  position: relative;
  height: 360px;
}

.deco-card {
  position: absolute;
  border-radius: var(--radius-card);
  border: 1px solid rgba(255,255,255,0.12);
}

.deco-card--1 {
  width: 220px;
  height: 280px;
  background: rgba(255,255,255,0.04);
  top: 20px;
  left: 40px;
  transform: translateZ(0) rotate(-4deg);
  box-shadow: var(--shadow-xl);
  z-index: 1;
  backdrop-filter: blur(4px);
}

.deco-card--2 {
  width: 180px;
  height: 240px;
  background: rgba(255,255,255,0.07);
  top: 60px;
  left: 110px;
  transform: translateZ(0) rotate(2deg);
  box-shadow: var(--shadow-lg);
  z-index: 2;
  backdrop-filter: blur(8px);
}

.deco-card--3 {
  width: 140px;
  height: 200px;
  background: rgba(255,255,255,0.11);
  top: 100px;
  left: 170px;
  transform: translateZ(0) rotate(7deg);
  box-shadow: var(--shadow-md);
  z-index: 3;
  backdrop-filter: blur(12px);
}

/* Hero slash divider */
.hero-slash {
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 120px;
  background: var(--clr-white);
  clip-path: polygon(0 60%, 100% 0, 100% 100%, 0 100%);
  z-index: 3;
}

/* ===== Content Body Section ===== */
.content-body-section {
  background: var(--clr-white);
  padding: 5rem 0 4rem;
  position: relative;
  z-index: 2;
}

.content-layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  align-items: start;
}

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

/* ===== Page Content ===== */
.page-content-wrap {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-ink);
}

.page-content-wrap h2 {
  font-family: 'EB Garamond', serif;
  font-weight: 700;
  font-size: 1.9rem;
  margin-top: 3rem;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
  color: var(--clr-ink);
}

.page-content-wrap h2 + hr {
  border: none;
  border-top: 2px solid var(--clr-ink);
  margin-bottom: 1.4rem;
  width: 3rem;
}

.page-content-wrap h3 {
  font-family: 'EB Garamond', serif;
  font-weight: 600;
  font-size: 1.4rem;
  margin-top: 2.2rem;
  margin-bottom: 0.6rem;
  color: var(--clr-ink);
}

.page-content-wrap h3 + hr {
  border: none;
  border-top: 1px solid var(--clr-ink-30);
  margin-bottom: 1rem;
}

.page-content-wrap p {
  margin-bottom: 1.2rem;
}

.page-content-wrap ul,
.page-content-wrap ol {
  padding-left: 1.6rem;
  margin-bottom: 1.2rem;
}

.page-content-wrap li {
  margin-bottom: 0.5rem;
}

.page-content-wrap a {
  color: var(--clr-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-content-wrap a:hover {
  opacity: 0.65;
}

.page-content-wrap blockquote {
  border-left: 3px solid var(--clr-ink);
  padding-left: 1.2rem;
  margin: 1.5rem 0;
  color: var(--clr-ink-60);
  font-style: italic;
}

/* Section ids in content */
.page-content-wrap article {
  padding-top: 1rem;
}

/* ===== Aside ===== */
.content-aside {
  position: sticky;
  top: calc(var(--nav-h) + var(--announce-h) + 20px);
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  z-index: 10;
}

.aside-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-card);
  padding: 1.6rem 1.4rem;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 2;
  transition: box-shadow 0.22s, transform 0.22s;
}

.aside-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.aside-card--highlight {
  background: var(--clr-ink);
  color: var(--clr-white);
  border-color: var(--clr-ink);
  z-index: 3;
}

.aside-title {
  font-family: 'EB Garamond', serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.aside-card--highlight .aside-title {
  color: var(--clr-white);
}

.aside-card hr {
  border: none;
  border-top: 1px solid var(--clr-border);
  margin-bottom: 1rem;
}

.aside-card--highlight hr {
  border-top-color: rgba(255,255,255,0.2);
}

.aside-link {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0.3rem 0;
  font-size: 0.9rem;
  color: var(--clr-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--clr-border);
  font-family: 'EB Garamond', serif;
  transition: padding-left 0.18s;
}

.aside-link:last-child {
  border-bottom: none;
}

.aside-link:hover {
  padding-left: 0.5rem;
  opacity: 0.75;
}

.aside-desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.80);
  line-height: 1.65;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 0;
  position: relative;
  z-index: 2;
}

.footer-brand-row {
  padding: 3.5rem 2rem 0;
  max-width: 1280px;
  margin: 0 auto;
  overflow: hidden;
}

.footer-brand-giant {
  font-family: 'EB Garamond', serif;
  font-weight: 800;
  font-size: clamp(3rem, 10vw, 9rem);
  color: var(--clr-ink);
  letter-spacing: -0.03em;
  line-height: 1;
  display: block;
  opacity: 0.08;
  user-select: none;
}

.footer-cols {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 2rem 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-col dt {
  font-family: 'EB Garamond', serif;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--clr-ink);
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--clr-border);
}

.footer-col dd {
  font-size: 0.88rem;
  color: var(--clr-ink-60);
  line-height: 1.5;
}

.footer-col dd a {
  color: var(--clr-ink-60);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  transition: color 0.18s;
  padding: 0.2rem 0;
}

.footer-col dd a:hover {
  color: var(--clr-ink);
}

.footer-copy {
  border-top: 1px solid var(--clr-border);
  padding: 1.2rem 2rem;
  max-width: 1280px;
  margin: 0 auto;
}

.footer-copy p {
  font-size: 0.8rem;
  color: var(--clr-ink-60);
  text-align: center;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s cubic-bezier(.4,0,.2,1), transform 0.55s cubic-bezier(.4,0,.2,1);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ===== HR decoration ===== */
hr {
  border: none;
  border-top: 1px solid var(--clr-border);
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .content-aside {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: right;
  }

  .hero-text-wrap {
    grid-column: 1;
  }

  .hero-deco {
    display: none;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-h: 60px;
  }

  html {
    font-size: 17px;
  }

  .header-inner {
    padding: 0 1rem;
    gap: 1rem;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .site-nav p {
    gap: 0;
  }

  .site-nav p a {
    padding: 0.5rem 0.5rem;
    font-size: 0.82rem;
  }

  .hero-inner {
    padding: 5rem 1.2rem 4rem;
  }

  .hero-title {
    font-size: clamp(2rem, 9vw, 3rem);
  }

  .content-body-section {
    padding: 3rem 0 2.5rem;
  }

  .content-layout {
    padding: 0 1.2rem;
  }

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

  .footer-cols {
    grid-template-columns: 1fr;
    padding: 2rem 1.2rem 1.5rem;
  }

  .footer-brand-row {
    padding: 2rem 1.2rem 0;
  }

  .footer-copy {
    padding: 1rem 1.2rem;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav p a::after,
  .aside-card,
  .aside-link,
  .site-nav p a {
    transition: none;
  }

  .deco-card--1,
  .deco-card--2,
  .deco-card--3 {
    transform: none;
  }
}

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