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

:root {
  --xy-bg: #0D1117;
  --xy-bg-deep: #0A2540;
  --xy-orange: #FF6A00;
  --xy-green: #39FF14;
  --xy-wine: #722F37;
  --xy-indigo: #4B0082;
  --xy-teal: #0F4C5C;
  --xy-light: #F0F4F8;
  --xy-mist: #CBD5E1;
  --xy-white: #FFFFFF;
  --xy-dark: #0A0F1A;
  --xy-font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --xy-font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --xy-font-mono: "Roboto Mono", "Source Code Pro", monospace;
  --xy-wrapper: 1400px;
  --xy-gutter: clamp(20px, 4vw, 48px);
  --xy-header-h: 80px;
  --xy-radius: 18px;
  --xy-radius-sm: 10px;
  --xy-speed: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --xy-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  font-family: var(--xy-font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--xy-light);
  background-color: var(--xy-bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a {
  color: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--xy-font-display);
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.8rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

/* ===== Utilities ===== */
.container {
  width: min(100% - 2 * var(--xy-gutter), var(--xy-wrapper));
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--xy-font-display);
  font-weight: 700;
  font-style: italic;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: 2px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--xy-speed), background-color var(--xy-speed), color var(--xy-speed), border-color var(--xy-speed);
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--xy-orange); color: var(--xy-dark); border-color: var(--xy-orange); }
.btn--primary:hover { background: transparent; color: var(--xy-orange); }
.btn--ghost { background: transparent; color: var(--xy-light); border-color: rgba(240, 244, 248, 0.4); }
.btn--ghost:hover { border-color: var(--xy-green); color: var(--xy-green); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-size: 14px;
  color: var(--xy-mist);
}
.breadcrumb a { color: var(--xy-orange); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb__sep { opacity: 0.5; }

.data-number {
  font-family: var(--xy-font-mono);
  font-weight: 500;
  font-size: 0.92em;
  color: var(--xy-green);
  letter-spacing: 0.02em;
}

.text-stroke {
  color: transparent;
  -webkit-text-stroke: 2px var(--xy-light);
}
.text-stroke--orange {
  color: transparent;
  -webkit-text-stroke: 2px var(--xy-orange);
}

.img-holder {
  position: relative;
  display: block;
  background: linear-gradient(135deg, var(--xy-teal), var(--xy-bg-deep));
  border-radius: var(--xy-radius);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}
.img-holder--portrait { aspect-ratio: 3 / 4; }
.img-holder--destructive { background: linear-gradient(135deg, var(--xy-indigo), var(--xy-wine)); }
.img-holder::after {
  content: attr(data-label);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  font-family: var(--xy-font-mono);
  font-size: 12px;
  color: var(--xy-mist);
  background: linear-gradient(0deg, rgba(10, 15, 26, 0.85) 0%, transparent 100%);
}
.img-holder > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 300;
  padding: 8px 20px;
  border-radius: 999px;
  background: var(--xy-orange);
  color: var(--xy-dark);
  font-family: var(--xy-font-display);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.25s ease;
}
.skip-link:focus {
  transform: translateY(0);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 110;
  height: var(--xy-header-h);
  background: rgba(10, 37, 64, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(203, 213, 225, 0.1);
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2;
  background: linear-gradient(90deg, var(--xy-orange), var(--xy-green), var(--xy-teal), var(--xy-indigo), var(--xy-wine), var(--xy-orange));
  background-size: 300% 100%;
  animation: xy-speedline 6s linear infinite;
}
@keyframes xy-speedline {
  0% { background-position: 0% 0; }
  100% { background-position: 300% 0; }
}
.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 100%;
  width: min(100% - 2 * var(--xy-gutter), var(--xy-wrapper));
  margin-inline: auto;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--xy-orange);
  color: var(--xy-dark);
  font-family: var(--xy-font-display);
  font-weight: 900;
  font-style: italic;
  font-size: 16px;
  transform: rotate(-8deg);
  transition: transform var(--xy-speed);
}
.site-brand:hover .site-brand__mark {
  transform: rotate(0deg) scale(1.05);
}
.site-brand__text {
  font-family: var(--xy-font-display);
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--xy-light);
  line-height: 1;
}
.site-brand__text em {
  font-style: normal;
  color: var(--xy-orange);
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  color: var(--xy-light);
  font-family: var(--xy-font-display);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  border-radius: 999px;
  transition: color var(--xy-speed), background-color var(--xy-speed);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 3px;
  height: 2px;
  background: var(--xy-green);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--xy-speed);
}
.site-nav__link:hover {
  color: var(--xy-orange);
  background: rgba(255, 106, 0, 0.08);
}
.site-nav__link:hover::after {
  transform: scaleX(1);
}
.site-nav__link[aria-current="page"] {
  color: var(--xy-orange);
  background: rgba(255, 106, 0, 0.12);
}
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--xy-orange);
}

.site-search {
  position: relative;
  flex-shrink: 0;
  margin-left: auto;
}
.site-search__label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.site-search__input {
  width: 170px;
  height: 40px;
  padding: 8px 16px 8px 14px;
  border: 1px solid rgba(203, 213, 225, 0.2);
  border-radius: 999px;
  background: rgba(13, 17, 23, 0.6);
  color: var(--xy-light);
  font-family: var(--xy-font-mono);
  font-size: 13px;
  outline: none;
  transition: width var(--xy-speed), border-color var(--xy-speed), box-shadow var(--xy-speed);
}
.site-search__input::placeholder {
  color: var(--xy-mist);
  opacity: 0.7;
}
.site-search__input:focus {
  width: 210px;
  border-color: var(--xy-green);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.15);
}
.site-search__suggestions {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  left: auto;
  min-width: 220px;
  background: var(--xy-dark);
  border: 1px solid rgba(203, 213, 225, 0.15);
  border-radius: var(--xy-radius-sm);
  box-shadow: var(--xy-shadow);
  overflow: hidden;
  display: none;
  z-index: 120;
}
.site-search__suggestion {
  display: block;
  padding: 10px 16px;
  color: var(--xy-light);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(203, 213, 225, 0.08);
  transition: background-color var(--xy-speed), color var(--xy-speed);
}
.site-search__suggestion:last-child {
  border-bottom: none;
}
.site-search__suggestion:hover {
  background: var(--xy-orange);
  color: var(--xy-dark);
}

.site-nav__toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 46px;
  height: 46px;
  padding: 6px;
  background: transparent;
  border: 1px solid rgba(203, 213, 225, 0.2);
  border-radius: var(--xy-radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}
.site-nav__toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--xy-light);
  border-radius: 2px;
  transition: transform var(--xy-speed), opacity var(--xy-speed);
}
.site-nav__toggle-label {
  font-size: 10px;
  line-height: 1;
  color: var(--xy-mist);
}
.site-nav__toggle:hover {
  border-color: var(--xy-orange);
}
.site-nav__toggle:hover .site-nav__toggle-bar {
  background: var(--xy-orange);
}
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(2) {
  opacity: 0;
}
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 10vw, 120px);
  background:
    radial-gradient(rgba(57, 255, 20, 0.05) 1px, transparent 1px),
    var(--xy-dark);
  background-size: 32px 32px;
  background-position: 0 0;
  border-top: 1px solid rgba(203, 213, 225, 0.08);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--xy-indigo), var(--xy-wine), var(--xy-teal), var(--xy-orange), var(--xy-green));
  z-index: 1;
}
.site-footer::after {
  content: "";
  position: absolute;
  right: 40px;
  bottom: 12px;
  width: 200px;
  height: 20px;
  background: repeating-linear-gradient(120deg, rgba(255, 106, 0, 0.4) 0 6px, transparent 6px 12px, rgba(57, 255, 20, 0.3) 12px 16px, transparent 16px 24px);
  border-radius: 99px;
  opacity: 0.35;
  pointer-events: none;
}
.site-footer__top {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
  gap: 48px;
  width: min(100% - 2 * var(--xy-gutter), var(--xy-wrapper));
  margin-inline: auto;
  padding: 64px 0 48px;
}
.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}
.site-footer__trust {
  font-size: 14px;
  line-height: 1.8;
  color: var(--xy-mist);
  max-width: 36ch;
}
.site-footer__heading {
  font-family: var(--xy-font-display);
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--xy-orange);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(203, 213, 225, 0.12);
}
.site-footer__links {
  list-style: none;
}
.site-footer__links li + li {
  margin-top: 10px;
}
.site-footer__links a {
  color: var(--xy-light);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--xy-speed), padding-left var(--xy-speed);
}
.site-footer__links a:hover {
  color: var(--xy-green);
  padding-left: 6px;
}
.site-footer__contact p {
  font-size: 14px;
  color: var(--xy-mist);
  line-height: 1.9;
}
.site-footer__bottom {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  width: min(100% - 2 * var(--xy-gutter), var(--xy-wrapper));
  margin-inline: auto;
  padding: 16px 0 24px;
  border-top: 1px solid rgba(203, 213, 225, 0.08);
  font-size: 13px;
  color: var(--xy-mist);
}
.site-footer__coords {
  font-family: var(--xy-font-mono);
  font-size: 12px;
  color: var(--xy-green);
  opacity: 0.7;
  letter-spacing: 0.06em;
}

/* ===== Back To Top ===== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  background: var(--xy-orange);
  color: var(--xy-dark);
  border: none;
  border-radius: 999px;
  font-family: var(--xy-font-display);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(255, 106, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--xy-speed), transform var(--xy-speed), visibility var(--xy-speed);
}
.back-top:hover {
  background: var(--xy-green);
  box-shadow: 0 6px 24px rgba(57, 255, 20, 0.3);
}
.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ===== Section Nav ===== */
.section-nav {
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding: 16px;
  border-radius: var(--xy-radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(203, 213, 225, 0.1);
}
.section-nav__link {
  display: block;
  padding: 8px 12px;
  color: var(--xy-mist);
  text-decoration: none;
  font-size: 14px;
  border-radius: 8px;
  border-left: 2px solid transparent;
  transition: background-color var(--xy-speed), color var(--xy-speed);
}
.section-nav__link:hover {
  color: var(--xy-orange);
  background: rgba(255, 106, 0, 0.06);
}
.section-nav__link.is-current,
.section-nav__link[aria-current="true"] {
  color: var(--xy-dark);
  background: var(--xy-green);
  border-left-color: var(--xy-orange);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 105;
    display: block;
    padding: calc(var(--xy-header-h) + 24px) var(--xy-gutter) 48px;
    background: linear-gradient(150deg, var(--xy-bg-deep) 0%, var(--xy-teal) 45%, var(--xy-wine) 100%);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease, visibility 0.4s ease;
  }
  .site-nav[data-open="true"],
  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    margin-top: 16px;
    padding-top: 24px;
    border-top: 1px solid rgba(57, 255, 20, 0.25);
  }

  .site-nav__link {
    display: block;
    padding: 14px 18px;
    font-size: 18px;
    border-radius: var(--xy-radius);
    background: rgba(255, 255, 255, 0.03);
  }
  .site-nav__link::after {
    display: none;
  }
  .site-nav__link[aria-current="page"] {
    background: var(--xy-orange);
    color: var(--xy-dark);
  }

  .site-nav__toggle {
    display: inline-flex;
  }

  .site-search__input {
    width: 140px;
  }
  .site-search__input:focus {
    width: 160px;
  }
}

@media (max-width: 599px) {
  .site-search {
    order: 3;
  }
  .site-search__suggestions {
    position: fixed;
    top: calc(var(--xy-header-h) - 3px);
    left: 16px;
    right: 16px;
    min-width: 0;
  }

  .site-brand__text {
    font-size: 18px;
  }
  .site-brand__mark {
    width: 36px;
    height: 36px;
    font-size: 14px;
    border-radius: 12px;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .site-footer__brand {
    align-items: center;
    text-align: center;
  }
  .site-footer__trust {
    max-width: none;
  }
  .site-footer__col {
    text-align: center;
  }
  .site-footer__heading {
    display: inline-block;
  }
  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
  }
  .site-footer::after {
    display: none;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    padding: 10px 16px;
    font-size: 12px;
  }
}

/* ===== Accessibility ===== */
:focus-visible {
  outline: 3px solid var(--xy-green);
  outline-offset: 2px;
}

body.no-scroll {
  overflow: hidden;
}

@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;
  }
}