:root {
  color-scheme: light;
  --ink: #2d2a26;
  --ink-soft: rgba(45, 42, 38, 0.68);
  --tea: #8f795d;
  --tea-deep: #6b5842;
  --jade: #5c8f7a;
  --lotus: #c8a394;
  --shadow: rgba(32, 30, 27, 0.2);
  --glass: rgba(255, 255, 255, 0.62);
  --border: rgba(45, 42, 38, 0.12);
  --glow: rgba(183, 155, 142, 0.35);
  --marble-angle: 135deg;
  --marble-drift-x: 0%;
  --marble-drift-y: 0%;
  --marble-veil: 0.2;
  --marble-flow: 0deg;
  font-family: "Noto Serif SC", "Source Han Serif SC", "PingFang SC",
    "Microsoft YaHei", serif;
}

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

html,
body {
  height: auto;
}

body {
  background: radial-gradient(circle at 20% 10%, rgba(255, 255, 255, 0.75), transparent 45%),
    radial-gradient(circle at 80% 15%, rgba(226, 219, 210, 0.65), transparent 50%),
    linear-gradient(var(--marble-angle), #f7f3ee 0%, #f1ece6 45%, #f8f4ef 100%);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  line-height: 1.7;
  min-height: 100dvh;
  overflow-x: hidden;
  overscroll-behavior-y: none;
  padding: clamp(1rem, 3vw, 2.5rem) clamp(0.6rem, 2.5vw, 1.25rem);
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: -20%;
  background: radial-gradient(circle at 20% 30%, rgba(208, 197, 187, 0.45), transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(182, 201, 192, 0.35), transparent 50%),
    repeating-linear-gradient(
      var(--marble-angle),
      rgba(190, 180, 168, 0.28) 0 2px,
      rgba(235, 229, 222, 0.8) 2px 5px,
      rgba(186, 176, 165, 0.32) 5px 8px
    ),
    repeating-linear-gradient(
      calc(var(--marble-angle) + 40deg),
      rgba(170, 160, 150, 0.3) 0 1px,
      rgba(247, 244, 239, 0.85) 1px 4px,
      rgba(172, 162, 152, 0.35) 4px 7px
    ),
    repeating-linear-gradient(
      calc(var(--marble-angle) - 25deg),
      rgba(158, 148, 136, 0.2) 0 1px,
      rgba(255, 255, 255, 0) 1px 6px
    ),
    linear-gradient(
      120deg,
      rgba(255, 255, 255, 0.8),
      rgba(224, 217, 209, var(--marble-veil))
    );
  filter: blur(20px) saturate(110%);
  opacity: 0.8;
  transform: translate3d(var(--marble-drift-x), var(--marble-drift-y), 0)
    rotate(var(--marble-flow));
  pointer-events: none;
  z-index: -2;
  animation: marble-flow 24s ease-in-out infinite alternate;
}

body::after {
  inset: -30%;
  opacity: 0.55;
  filter: blur(32px) saturate(120%);
  mix-blend-mode: multiply;
  animation-duration: 32s;
  background: conic-gradient(
      from 120deg at 30% 40%,
      rgba(190, 182, 171, 0.25),
      transparent 30%,
      rgba(210, 202, 192, 0.3),
      transparent 55%,
      rgba(180, 171, 160, 0.25)
    ),
    radial-gradient(circle at 70% 30%, rgba(214, 206, 198, 0.4), transparent 55%),
    radial-gradient(circle at 40% 75%, rgba(186, 178, 168, 0.35), transparent 60%);
}

@keyframes marble-flow {
  0% {
    transform: translate3d(-2%, -1%, 0) rotate(-1.2deg) scale(1.02);
  }
  100% {
    transform: translate3d(2%, 1%, 0) rotate(1.2deg) scale(1.05);
  }
}

.page {
  width: min(960px, 96vw);
  display: grid;
  place-items: start center;
  padding: 2.5rem 1.5rem 2.5rem;
  min-height: auto;
  margin: 0 auto;
}

.center-card {
  width: min(100%, 920px);
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.78),
    rgba(246, 241, 234, 0.6) 45%,
    rgba(232, 226, 217, 0.5)
  );
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 24px;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: 0 24px 60px rgba(60, 54, 46, 0.2),
    inset 0 0 40px rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(36px) saturate(170%);
  display: grid;
  gap: 2rem;
  position: relative;
  overflow: hidden;
}

.center-card > * {
  position: relative;
  z-index: 1;
}

.center-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.6), transparent 40%),
    linear-gradient(320deg, rgba(196, 179, 167, 0.25), transparent 60%),
    radial-gradient(circle at 80% 10%, rgba(255, 255, 255, 0.65), transparent 35%);
  mix-blend-mode: screen;
  pointer-events: none;
}

.center-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: repeating-linear-gradient(
      120deg,
      rgba(255, 255, 255, 0.08) 0 1px,
      rgba(255, 255, 255, 0) 1px 6px
    ),
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.25), transparent 40%);
  opacity: 0.22;
  pointer-events: none;
}

.title-block {
  text-align: center;
  display: grid;
  gap: 0.6rem;
}

.title-block .eyebrow {
  font-size: 0.9rem;
  letter-spacing: 0.4rem;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.title-block h1 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  text-shadow: 0 0 18px rgba(193, 154, 139, 0.25);
}

.title-block .subtitle {
  color: var(--ink-soft);
  font-size: 1rem;
}

.interactive-grid {
  display: grid;
  gap: 1rem;
}

.interactive-item {
  position: relative;
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.72), rgba(235, 227, 218, 0.7));
  border: 1px solid rgba(45, 42, 38, 0.1);
  border-radius: 16px;
  padding: 1.1rem 1.35rem;
  text-decoration: none;
  color: inherit;
  display: grid;
  gap: 0.45rem;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  box-shadow: 0 10px 20px rgba(60, 54, 46, 0.12);
  isolation: isolate;
  min-height: 92px;
}

.interactive-item::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    circle at var(--glow-x, 15%) var(--glow-y, 20%),
    rgba(193, 154, 139, 0.32),
    transparent 55%
  );
  opacity: 0;
  transition: opacity 0.35s ease;
  z-index: -1;
}

.interactive-item:hover,
.interactive-item:focus-within {
  transform: translateY(-4px);
  border-color: rgba(193, 154, 139, 0.4);
  box-shadow: 0 16px 35px rgba(60, 54, 46, 0.2);
}

.interactive-item:hover::after,
.interactive-item:focus-within::after {
  opacity: 1;
}

.interactive-item:active {
  transform: translateY(0);
}

.interactive-item .icon {
  font-size: 1.4rem;
}

.interactive-item .text {
  font-weight: 600;
}

.interactive-item .hint {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.intro-panel[aria-expanded="true"] {
  border-color: rgba(106, 154, 134, 0.6);
  box-shadow: 0 20px 40px rgba(60, 54, 46, 0.2), 0 0 25px rgba(106, 154, 134, 0.2);
}

.intro-toggle {
  background: transparent;
  border: none;
  color: inherit;
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  gap: 0.5rem 0.8rem;
  align-items: center;
  font: inherit;
  cursor: pointer;
  text-align: left;
}

.intro-toggle .text {
  font-weight: 600;
  grid-column: 2 / 3;
  grid-row: 1 / 2;
}

.intro-toggle .icon {
  grid-column: 1 / 2;
  grid-row: 1 / 3;
}

.intro-toggle .hint {
  grid-column: 2 / 3;
  grid-row: 2 / 3;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.intro-toggle:focus-visible {
  outline: 2px solid var(--lotus);
  outline-offset: 4px;
}

.intro-toggle .chevron {
  grid-column: 3 / 4;
  grid-row: 2 / 3;
  transition: transform 0.35s ease;
  align-self: center;
}

.intro-panel[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.intro-body {
  padding-top: 0.8rem;
  color: var(--ink-soft);
  display: grid;
  gap: 0.8rem;
  font-size: 0.95rem;
  height: 0;
  opacity: 0;
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
  padding-right: 0.6rem;
  transform: translateY(-4px);
  transition: height 0.35s ease, opacity 0.3s ease, transform 0.3s ease;
  will-change: height, opacity, transform;
}

.intro-panel[aria-expanded="true"] .intro-body {
  opacity: 1;
  transform: translateY(0);
  overflow: auto;
}

.intro-body strong {
  color: #3d352c;
}

.intro-body .closing {
  color: #3b342c;
  text-align: center;
  letter-spacing: 0.1rem;
}

.intro-actions {
  position: sticky;
  bottom: 0;
  display: flex;
  justify-content: center;
  padding: 0.6rem 0 0.2rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(235, 228, 219, 0.9));
}

.intro-close {
  border: 1px solid rgba(193, 154, 139, 0.45);
  background: rgba(255, 255, 255, 0.75);
  color: var(--ink);
  padding: 0.4rem 1.2rem;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.intro-close:hover,
.intro-close:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(193, 154, 139, 0.7);
  box-shadow: 0 6px 18px rgba(60, 54, 46, 0.2);
}

.action-link:hover .icon,
.action-link:focus-visible .icon {
  filter: drop-shadow(0 0 12px var(--glow));
}

.action-link:visited {
  color: #4c4337;
}

.action-link::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 12px;
  border: 1px solid rgba(193, 154, 139, 0.2);
  pointer-events: none;
  mix-blend-mode: screen;
}

.action-link::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    circle at var(--glow-x, 50%) var(--glow-y, 50%),
    rgba(236, 230, 218, 0.25),
    transparent 55%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.action-link:hover::after,
.action-link:focus-visible::after {
  opacity: 1;
}

.page-footer {
  padding: 1rem 0 2rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
  text-align: center;
}

.page-footer::first-letter {
  color: var(--tea);
}

.interactive-grid > :nth-child(odd) {
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.8), rgba(237, 230, 220, 0.7));
}

.interactive-grid > :nth-child(even) {
  background: linear-gradient(140deg, rgba(248, 245, 240, 0.82), rgba(232, 226, 217, 0.7));
}

@media (max-width: 720px) {
  .page {
    padding: 1.6rem 0.6rem 2rem;
    min-height: auto;
  }

  .title-block .eyebrow {
    letter-spacing: 0.25rem;
  }

  .interactive-item {
    padding: 1rem 1.1rem;
  }

  .intro-body {
    font-size: 0.9rem;
  }
}

@media (max-width: 520px) {
  .center-card {
    padding: 1.2rem;
    gap: 1.5rem;
    width: 100%;
  }

  .interactive-item {
    min-height: 80px;
  }

  .intro-toggle .hint {
    font-size: 0.78rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}