:root {
  --c-primary: #5B2D6E;
  --c-primary-dark: #3D1D4A;
  --c-primary-light: #7A4A8C;
  --c-gold: #D4AF37;
  --c-gold-light: #E8C96A;
  --c-green: #1E3A2F;
  --c-green-light: #2E5242;
  --c-ivory: #FFFFF0;
  --c-gray: #F2F2F2;
  --c-gray-deep: #E4E4E4;
  --c-charcoal: #1A1A1A;
  --c-blue: #00A8E8;
  --c-violet-dark: #2B1540;
  --c-warm: #E8E3DA;
  --c-danger: #C0392B;

  --font-serif: "Source Han Serif SC", "STSong", "Noto Serif SC", serif;
  --font-sans: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Menlo", monospace;

  --fs-hero: clamp(3rem, 8vw, 6rem);
  --fs-h2: clamp(2rem, 5vw, 3.5rem);
  --fs-h3: 1.5rem;
  --fs-body: 1rem;
  --fs-small: 0.8rem;
  --fs-micro: 0.7rem;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 5rem;

  --container: 1280px;
  --container-narrow: 880px;
  --radius-sm: 2px;
  --radius-md: 6px;
  --header-h: 68px;
  --transition: 0.25s ease;
  --shadow-glass: 0 12px 32px rgba(43, 21, 64, 0.16);
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-charcoal);
  background-color: var(--c-ivory);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body[data-version-mode="old"] {
  background-color: var(--c-warm);
}

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

input,
button,
textarea,
select {
  font: inherit;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul[class],
ol[class] {
  list-style: none;
  padding: 0;
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.25;
}

h1 {
  font-size: var(--fs-hero);
  font-weight: 200;
}

h2 {
  font-size: var(--fs-h2);
}

h3 {
  font-size: var(--fs-h3);
}

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

button {
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-2);
  z-index: 2000;
  background: var(--c-charcoal);
  color: var(--c-ivory);
  padding: 0.5em 1.2em;
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
  font-weight: 600;
  transition: top var(--transition);
}

.skip-link:focus {
  top: var(--space-2);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(43, 21, 64, 0.96) 0%, rgba(43, 21, 64, 0.88) 100%);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.28);
}

.site-header__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  min-height: var(--header-h);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--c-gold);
  color: var(--c-charcoal);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.2rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 14px rgba(212, 175, 55, 0.3);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-ivory);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.site-brand__accent {
  color: var(--c-gold);
}

.site-brand__domain {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: rgba(255, 255, 240, 0.6);
  letter-spacing: 0.12em;
}

.site-nav {
  margin-inline: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  padding: 0.5em 0.7em;
  font-size: var(--fs-small);
  color: rgba(255, 255, 240, 0.82);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 0.68em;
  color: var(--c-gold);
}

.nav-link__label {
  font-family: var(--font-sans);
}

.nav-link:hover {
  color: var(--c-gold);
  background: rgba(212, 175, 55, 0.08);
}

.nav-link[aria-current="page"] {
  color: var(--c-gold);
  background: rgba(212, 175, 55, 0.12);
  box-shadow: inset 0 -2px 0 var(--c-gold);
}

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

.version-switch {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: rgba(255, 255, 240, 0.08);
  padding: 3px;
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.version-switch__btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  padding: 0.35em 0.9em;
  border-radius: 999px;
  color: rgba(255, 255, 240, 0.7);
  transition: color var(--transition), background var(--transition);
}

.version-switch__btn.is-active {
  background: var(--c-gold);
  color: var(--c-charcoal);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: rgba(212, 175, 55, 0.1);
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-ivory);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-footer {
  background: var(--c-green);
  color: rgba(255, 255, 240, 0.78);
  position: relative;
  overflow: hidden;
  margin-top: auto;
}

.footer-ornament {
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-primary) 40%, var(--c-green-light) 100%);
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: var(--space-5);
  padding-block: var(--space-6);
}

.footer-brand__name {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-ivory);
  letter-spacing: 0.02em;
}

.footer-brand__accent {
  color: var(--c-gold);
}

.footer-brand__domain {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: rgba(255, 255, 240, 0.5);
  margin-top: 0.25rem;
  letter-spacing: 0.08em;
}

.footer-trust {
  margin-top: var(--space-3);
  font-size: var(--fs-small);
  line-height: 1.9;
  color: rgba(255, 255, 240, 0.65);
  max-width: 46em;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--c-gold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  border-bottom: 1px solid rgba(212, 175, 55, 0.25);
  padding-bottom: 0.5rem;
}

.footer-links__list,
.footer-contact__list {
  display: grid;
  gap: 0.5rem;
  font-size: var(--fs-small);
}

.footer-links__list a {
  display: inline-block;
  color: rgba(255, 255, 240, 0.75);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links__list a:hover {
  color: var(--c-gold);
  padding-left: 4px;
}

.footer-contact__list {
  color: rgba(255, 255, 240, 0.7);
  line-height: 1.8;
}

.footer-contact__link {
  display: inline-block;
  color: var(--c-gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
  transition: border-color var(--transition);
}

.footer-contact__link:hover {
  border-color: var(--c-gold);
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 240, 0.1);
  padding-block: var(--space-3);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: rgba(255, 255, 240, 0.5);
  letter-spacing: 0.04em;
}

.footer-icp {
  font-family: var(--font-mono);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.65em 1.4em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 2px;
}

.btn-gold {
  background: var(--c-gold);
  color: var(--c-charcoal);
  border-color: var(--c-gold);
}

.btn-gold:hover {
  background: var(--c-gold-light);
  border-color: var(--c-gold-light);
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--c-primary);
  color: var(--c-ivory);
  border-color: var(--c-primary);
}

.btn-primary:hover {
  background: var(--c-primary-dark);
  border-color: var(--c-primary-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--c-primary);
  border-color: currentColor;
}

.btn-outline:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
}

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid--editorial {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--space-5);
}

.glass-card {
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-glass);
}

.solid-card {
  background: var(--c-ivory);
  border: 1px solid var(--c-gray-deep);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.frame {
  position: relative;
  overflow: hidden;
  background: var(--c-gray);
  aspect-ratio: 4 / 3;
}

.frame--wide {
  aspect-ratio: 16 / 9;
}

.frame--portrait {
  aspect-ratio: 3 / 4;
}

.frame--cover {
  aspect-ratio: 3 / 2;
}

.frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.frame:hover img {
  transform: scale(1.03);
}

.section {
  padding-block: var(--space-6);
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--c-gold);
  padding-bottom: var(--space-2);
}

.section-index {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--c-gold);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.section-title {
  font-size: var(--fs-h3);
  font-weight: 400;
}

.section-note {
  margin-inline-start: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: rgba(26, 26, 26, 0.55);
  white-space: nowrap;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: var(--fs-small);
  color: rgba(26, 26, 26, 0.65);
  margin-bottom: var(--space-4);
}

.breadcrumb a {
  color: var(--c-primary);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--c-gold);
}

.breadcrumb__sep {
  color: var(--c-gold);
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--c-gold) 0%, transparent 60%);
  margin-block: var(--space-5);
}

.only-old {
  display: none;
}

body[data-version-mode="old"] .only-old {
  display: block;
}

body[data-version-mode="old"] .only-new {
  display: none;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

[data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

[data-particles] {
  position: relative;
  overflow: hidden;
}

.grape-particle {
  position: absolute;
  top: -20px;
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  animation-name: grape-fall;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  will-change: transform, opacity;
}

@keyframes grape-fall {
  0% {
    transform: translateY(-20px) rotate(0deg);
    opacity: 0;
  }
  12% {
    opacity: 0.65;
  }
  85% {
    opacity: 0.3;
  }
  100% {
    transform: translateY(var(--fall-distance, 80vh)) rotate(360deg);
    opacity: 0;
  }
}

@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__main {
    grid-template-columns: 1.4fr 1fr;
    gap: var(--space-4);
    padding-block: var(--space-5);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 920px) {
  .site-header__inner {
    gap: var(--space-1);
  }

  .site-nav {
    display: none;
    flex-basis: 100%;
    order: 5;
    margin: 0;
  }

  .site-nav[data-open="true"] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding-block: var(--space-2);
    border-top: 1px solid rgba(212, 175, 55, 0.2);
  }

  .nav-link {
    justify-content: flex-start;
    padding: 0.75em 0.5em;
    border-radius: 0;
    font-size: var(--fs-body);
    border-bottom: 1px solid rgba(255, 255, 240, 0.06);
  }

  .nav-link[aria-current="page"] {
    box-shadow: inset 2px 0 0 var(--c-gold);
  }

  .header-tools {
    margin-inline-start: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .grid--editorial,
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-footer__main {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding-block: var(--space-5);
  }

  .footer-brand {
    grid-column: auto;
  }

  .section {
    padding-block: var(--space-5);
  }
}

@media (max-width: 480px) {
  .site-brand__domain {
    display: none;
  }

  .site-brand__name {
    font-size: 1rem;
  }

  .site-brand__mark {
    width: 38px;
    height: 38px;
  }

  .version-switch__btn {
    font-size: 0.62rem;
    padding: 0.3em 0.7em;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}