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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Helvetica, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #F5F0E1;
  background-color: #2E0D3A;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: Didot, "Source Han Serif SC", "STSong", "SimSun", serif;
  font-weight: normal;
  line-height: 1.25;
}

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

ul,
ol {
  list-style: none;
}

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

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

::selection {
  background: #D4AF37;
  color: #0D0D0D;
}

:focus-visible {
  outline: 2px solid #FFD700;
  outline-offset: 2px;
}

/* ========== VARIABLES ========== */
:root {
  --clr-royal-purple: #2E0D3A;
  --clr-purple: #6A0DAD;
  --clr-bright-purple: #9B30FF;
  --clr-gold: #D4AF37;
  --clr-bright-gold: #FFD700;
  --clr-black: #0D0D0D;
  --clr-silver: #C0C0C0;
  --clr-ivory: #F5F0E1;
  --clr-stone: #8C8A86;
  --clr-moss: #6B7B4F;
  --clr-terracotta: #A4633A;

  --font-heading: Didot, "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-body: Helvetica, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Courier New", monospace;

  --container-max: 1260px;
  --container-pad: 24px;
}

/* ========== LAYOUT CONTAINERS ========== */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.site-main {
  min-height: 60vh;
}

.section {
  padding: 80px 0;
}

.section--compact {
  padding: 48px 0;
}

/* ========== SKIP LINK ========== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 1000;
  background: var(--clr-gold);
  color: var(--clr-black);
  padding: 8px 16px;
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 8px;
}

/* ========== HEADER ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, #2E0D3A 0%, #250A30 100%);
  border-bottom: 1px solid rgba(212, 175, 55, 0.32);
}

.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, #D4AF37 0%, #FFD700 100%);
  pointer-events: none;
  z-index: 5;
}

.site-header__topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.site-header__brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--clr-gold);
  background: rgba(212, 175, 55, 0.08);
  color: var(--clr-gold);
  font-family: var(--font-heading);
  font-size: 24px;
  line-height: 1;
  transition: background 0.3s ease;
}

.site-header__brand:hover .site-header__brand-mark {
  background: rgba(212, 175, 55, 0.16);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: 0.1em;
  color: var(--clr-ivory);
  line-height: 1.2;
  transition: color 0.3s ease;
}

.site-header__brand:hover .site-header__brand-name {
  color: var(--clr-gold);
}

.site-header__tagline {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--clr-silver);
  margin-top: 2px;
}

.site-header__tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-header__tool {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid rgba(212, 175, 55, 0.35);
  background: transparent;
  color: var(--clr-gold);
  font-family: var(--font-mono);
  font-size: 13px;
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.site-header__tool:hover {
  background: rgba(212, 175, 55, 0.14);
  border-color: var(--clr-gold);
  color: var(--clr-bright-gold);
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid rgba(212, 175, 55, 0.35);
  background: transparent;
  color: var(--clr-gold);
  transition: border-color 0.3s ease;
}

.site-header__toggle:hover {
  border-color: var(--clr-gold);
}

.site-header__toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-header__toggle-line {
  display: block;
  width: 16px;
  height: 1px;
  background: var(--clr-gold);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-header__toggle-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--clr-silver);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-header__nav-wrap {
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
}

.site-header__nav {
  display: flex;
  gap: 8px;
}

.site-header__nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 16px 6px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--clr-ivory);
  position: relative;
  transition: color 0.3s ease;
}

.site-header__nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--clr-gold);
  opacity: 0.7;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  right: 50%;
  bottom: 0;
  height: 2px;
  background: var(--clr-gold);
  transition: left 0.3s ease, right 0.3s ease;
}

.site-header__nav-link:hover {
  color: var(--clr-gold);
}

.site-header__nav-link:hover::after,
.site-header__nav-link[aria-current="page"]::after {
  left: 0;
  right: 0;
}

.site-header__nav-link[aria-current="page"] {
  color: var(--clr-gold);
}

.site-header__nav-link[aria-current="page"] .site-header__nav-index {
  opacity: 1;
}

/* ========== FOOTER ========== */
.site-footer {
  background: var(--clr-black);
  border-top: 1px solid var(--clr-gold);
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 48px;
  padding: 64px 0 48px;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-footer__brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--clr-gold);
  color: var(--clr-gold);
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: 1;
  flex-shrink: 0;
}

.site-footer__brand-text {
  display: flex;
  flex-direction: column;
}

.site-footer__brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.1em;
  color: var(--clr-ivory);
}

.site-footer__tagline {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--clr-silver);
  margin-top: 1px;
}

.site-footer__trust {
  border-left: 2px solid var(--clr-gold);
  padding-left: 16px;
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--clr-silver);
  max-width: 360px;
}

.site-footer__note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--clr-stone);
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-footer__note::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--clr-gold);
  border-radius: 50%;
  flex-shrink: 0;
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--clr-gold);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.site-footer__heading-index {
  font-family: var(--font-mono);
  font-size: 11px;
  margin-right: 6px;
  opacity: 0.7;
}

.site-footer__links li + li {
  margin-top: 8px;
}

.site-footer__links a {
  display: inline-block;
  padding: 3px 0;
  font-size: 14px;
  color: var(--clr-ivory);
  opacity: 0.85;
  transition: opacity 0.3s ease, color 0.3s ease, padding-left 0.3s ease;
}

.site-footer__links a::before {
  content: "▸";
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clr-gold);
  margin-right: 8px;
}

.site-footer__links a:hover {
  color: var(--clr-gold);
  opacity: 1;
  padding-left: 4px;
}

.site-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(212, 175, 55, 0.12);
}

.site-footer__contact-item:last-child {
  border-bottom: none;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--clr-gold);
  opacity: 0.75;
  text-transform: uppercase;
}

.site-footer__contact-value {
  font-size: 13px;
  color: var(--clr-silver);
  word-break: break-all;
  line-height: 1.5;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  font-size: 12px;
  color: var(--clr-stone);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.site-footer__bottom a {
  color: var(--clr-gold);
  transition: color 0.3s ease;
}

.site-footer__bottom a:hover {
  color: var(--clr-bright-gold);
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  min-width: 120px;
  font-size: 14px;
  letter-spacing: 0.06em;
  border: 1px solid var(--clr-gold);
  background: transparent;
  color: var(--clr-gold);
  cursor: pointer;
  text-align: center;
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.btn:hover {
  background: var(--clr-gold);
  color: var(--clr-black);
  border-color: var(--clr-gold);
}

.btn--gold {
  background: var(--clr-gold);
  color: var(--clr-black);
  border-color: var(--clr-gold);
}

.btn--gold:hover {
  background: var(--clr-bright-gold);
  border-color: var(--clr-bright-gold);
}

.btn--outline {
  border-color: var(--clr-ivory);
  color: var(--clr-ivory);
}

.btn--outline:hover {
  background: var(--clr-ivory);
  color: var(--clr-black);
  border-color: var(--clr-ivory);
}

/* ========== BREADCRUMB ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  margin-bottom: 24px;
  color: var(--clr-stone);
  font-family: var(--font-body);
}

.breadcrumb__link {
  color: var(--clr-gold);
  transition: color 0.3s ease;
}

.breadcrumb__link:hover {
  color: var(--clr-bright-gold);
}

.breadcrumb__sep {
  font-family: var(--font-mono);
  color: var(--clr-stone);
  margin: 0 3px;
}

.breadcrumb__current {
  color: var(--clr-silver);
}

/* ========== SECTION TITLE ========== */
.section-title {
  font-family: var(--font-heading);
  font-size: 30px;
  line-height: 1.3;
  color: var(--clr-ivory);
  margin-bottom: 24px;
}

.section-title--gold {
  color: var(--clr-gold);
}

.section-title__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: normal;
  letter-spacing: 0.24em;
  color: var(--clr-gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* ========== INDEX LABEL ========== */
.index-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--clr-gold);
  text-transform: uppercase;
}

/* ========== GRID ========== */
.grid {
  display: grid;
  gap: 24px;
}

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

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

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

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

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* ========== TILE / CARD ========== */
.tile {
  background: rgba(245, 240, 225, 0.04);
  border: 1px solid rgba(212, 175, 55, 0.25);
  padding: 28px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.tile:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 175, 55, 0.6);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

/* ========== MEDIA FRAME ========== */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(46, 13, 58, 0.5), rgba(13, 13, 13, 0.3)), var(--clr-black);
  border: 1px solid rgba(212, 175, 55, 0.35);
}

.media-frame::before {
  content: "IMAGE";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(192, 192, 192, 0.4);
}

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

.media-frame--square {
  aspect-ratio: 1;
}

.media-frame--gold-edge::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(212, 175, 55, 0.3);
  pointer-events: none;
}

/* ========== SCROLL REVEAL ========== */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .site-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 48px 0;
  }

  .site-footer__section--brand {
    grid-column: 1 / -1;
  }

  .section {
    padding: 56px 0;
  }
}

@media (max-width: 768px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__topbar {
    padding: 12px 0;
  }

  .site-header__nav-wrap {
    display: none;
    border-bottom: none;
  }

  .site-header__nav-wrap[data-open] {
    display: block;
    border-bottom: 1px solid rgba(212, 175, 55, 0.18);
  }

  .site-header__nav {
    flex-direction: column;
    gap: 0;
    padding: 6px 0 12px;
  }

  .site-header__nav-link {
    padding: 13px 0;
    border-bottom: 1px solid rgba(212, 175, 55, 0.12);
    align-items: center;
  }

  .site-header__nav-link::after {
    display: none;
  }

  .site-header__tools {
    gap: 6px;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 40px 0 32px;
  }

  .site-footer__section--brand {
    grid-column: auto;
  }

  .site-footer__bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding: 16px 0;
  }

  .container {
    padding-inline: 20px;
  }
}

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

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

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

  .site-header__nav-link::after {
    transition: none;
  }

  .btn,
  .tile,
  .site-footer__links a,
  .site-header__tool,
  .site-header__toggle-line {
    transition: none;
  }
}