:root {
  --red: #C8102E;
  --red-deep: #9B1B30;
  --black: #0B0B0F;
  --graphite: #16161D;
  --gold: #D4AF37;
  --gold-soft: #C9A84C;
  --white: #F2F2F2;
  --silver: #9B9B9B;
  --header-h: 88px;
  --header-h-mobile: 64px;
  --font-heading: Impact, "Archivo Black", "Noto Sans SC", sans-serif;
  --font-body: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SF Mono", Fixed, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
  background: var(--black);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1000px 600px at 85% -10%, rgba(200, 16, 46, 0.16) 0%, transparent 60%),
    radial-gradient(800px 500px at -10% 25%, rgba(212, 175, 55, 0.06) 0%, transparent 55%),
    var(--black);
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
}

p {
  margin: 0 0 1em;
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
  border-radius: 2px;
}

::selection {
  background: var(--red);
  color: var(--white);
}

#main-content {
  scroll-margin-top: var(--header-h);
  outline: none;
}

.container {
  width: min(calc(100% - 3rem), 1320px);
  margin-inline: auto;
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 2rem);
  }
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 5000;
  padding: 0.6rem 1.2rem;
  background: var(--gold);
  color: var(--black);
  font-weight: 700;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 100%, 12px 100%);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(11, 11, 15, 0.72) 0%, rgba(11, 11, 15, 0.30) 100%);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.4s, box-shadow 0.4s, border-color 0.4s;
}

.site-header::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(212, 175, 55, 0.35) 30%, rgba(200, 16, 46, 0.9) 70%, transparent 100%);
  pointer-events: none;
}

.site-header.is-scrolled {
  background: rgba(11, 11, 15, 0.92);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom-color: rgba(212, 175, 55, 0.35);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}

.site-header__inner {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  flex-shrink: 0;
}

.site-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--red) 0%, var(--red-deep) 100%);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 1.65rem;
  clip-path: polygon(12% 0, 100% 0, 88% 100%, 0 100%);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.site-brand__mark::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 14px;
  height: 12px;
  background: var(--gold);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-brand__name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  color: var(--white);
}

.site-brand__desc {
  margin-top: 0.15rem;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 1400;
  width: 44px;
  height: 44px;
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: var(--white);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.site-nav {
  position: static;
  visibility: visible;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.2rem, 1vw, 1rem);
}

.site-nav__item {
  flex-shrink: 0;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.85rem;
  font-weight: 700;
  font-size: 0.94rem;
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: rgba(242, 242, 242, 0.88);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
  transition: color 0.3s, background 0.3s, box-shadow 0.3s;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  bottom: 0.15rem;
  width: calc(100% - 1.7rem);
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--gold);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: #fff;
  background: var(--red);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.site-nav__link[aria-current="page"]::after {
  display: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 2000;
  background: linear-gradient(90deg, var(--red) 0%, var(--gold) 100%);
  box-shadow: 0 0 8px rgba(200, 16, 46, 0.55);
  pointer-events: none;
}

@media (max-width: 900px) {
  .site-header__inner {
    min-height: var(--header-h-mobile);
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1100;
    width: min(80vw, 340px);
    height: 100dvh;
    padding: calc(var(--header-h-mobile) + 26px) 1.6rem 2rem;
    background: linear-gradient(180deg, #0B0B0F 0%, #16161D 100%);
    border-left: 1px solid rgba(212, 175, 55, 0.32);
    box-shadow: -12px 0 40px rgba(0, 0, 0, 0.45);
    transform: translateX(100%);
    transition: transform 0.45s var(--ease), visibility 0.45s;
    overflow-y: auto;
    visibility: hidden;
  }

  .site-nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.3rem;
  }

  .site-nav__link {
    display: block;
    padding: 0.8rem 1rem;
    font-size: 1.08rem;
    clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 100%, 14px 100%);
  }

  .site-nav__link::after {
    left: 1rem;
    width: calc(100% - 2rem);
    bottom: 0.25rem;
  }

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

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

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

body.nav-lock {
  overflow: hidden;
}

.site-footer {
  position: relative;
  margin-top: clamp(3rem, 6vw, 6rem);
  background: linear-gradient(180deg, #0B0B0F 0%, #16161D 100%);
  border-top: 1px solid rgba(212, 175, 55, 0.3);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0%, var(--red) 30%, var(--gold) 100%);
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: clamp(2rem, 4vw, 4rem);
  padding: clamp(3rem, 6vw, 5rem) 0 2.5rem;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  letter-spacing: 0.04em;
  color: var(--white);
}

.site-footer__logo::before {
  content: "M";
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--red), var(--red-deep));
  clip-path: polygon(12% 0, 100% 0, 88% 100%, 0 100%);
  color: #fff;
}

.site-footer__logo::after {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--gold);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.site-footer__slogan {
  margin: 1.1rem 0 0.4rem;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.site-footer__trust {
  max-width: 30rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--silver);
}

.site-footer__section {
  min-width: 0;
}

.site-footer__heading {
  position: relative;
  margin: 0 0 1.1rem;
  padding-bottom: 0.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--white);
}

.site-footer__heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--red);
}

.site-footer__links li + li {
  margin-top: 0.55rem;
}

.site-footer__links a {
  position: relative;
  display: inline-block;
  font-size: 0.9rem;
  color: var(--silver);
  transition: color 0.25s, padding-left 0.25s;
}

.site-footer__links a:hover {
  color: var(--gold);
  padding-left: 0.55rem;
}

.site-footer__links a:hover::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 2px;
  background: var(--red);
  transform: translateY(-50%);
}

.site-footer__contact-list li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.6rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--silver);
}

.site-footer__contact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.4rem;
  height: 0.4rem;
  background: var(--red);
  transform: rotate(45deg);
}

.site-footer__bottom {
  border-top: 1px solid rgba(242, 242, 242, 0.08);
  padding: 1.15rem 0;
}

.site-footer__bottom .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 2rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--silver);
}

@media (max-width: 980px) {
  .site-footer__main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .site-footer__bottom .container {
    justify-content: center;
    text-align: center;
  }
}

.back-to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: 900;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  font-size: 1.15rem;
  color: #fff;
  background: linear-gradient(135deg, var(--red) 0%, var(--red-deep) 100%);
  border: 1px solid rgba(212, 175, 55, 0.6);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 100%, 12px 100%);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--gold);
  box-shadow: 0 0 18px rgba(212, 175, 55, 0.4);
  transform: translateY(-2px);
}

.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
}

.section--graphite {
  background: var(--graphite);
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section__title {
  position: relative;
  margin: 0;
  padding-left: 1rem;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
}

.section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 5px;
  background: var(--red);
  transform: skewX(-12deg);
}

.section__kicker {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  color: #fff;
  background: var(--red);
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 100%, 14px 100%);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.btn:hover {
  background: var(--red-deep);
  border-color: var(--gold);
  box-shadow: 0 0 0 1px var(--gold), 0 8px 30px rgba(200, 16, 46, 0.25);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(242, 242, 242, 0.45);
  color: var(--white);
}

.btn--ghost:hover {
  background: rgba(212, 175, 55, 0.1);
  border-color: var(--gold);
  color: var(--gold);
}

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

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.8rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--gold);
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.55);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
}

.tag--red {
  color: #fff;
  background: var(--red);
  border-color: var(--red);
}

.data-card {
  position: relative;
  padding: 1.6rem;
  background: linear-gradient(135deg, var(--graphite) 0%, #111116 100%);
  border: 1px solid rgba(242, 242, 242, 0.08);
  border-left: 4px solid var(--red);
}

.data-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 24px;
  height: 24px;
  border-top: 2px solid var(--gold-soft);
  border-right: 2px solid var(--gold-soft);
  opacity: 0.6;
}

.data-card__label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver);
}

.data-card__value {
  margin-top: 0.4rem;
  font-family: var(--font-data);
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
}

.data-card__value--accent {
  color: var(--gold);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--silver);
}

.breadcrumb a {
  color: var(--gold);
  transition: color 0.2s;
}

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

.breadcrumb [aria-current="page"] {
  color: var(--white);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.filter-tab {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 1.1rem;
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--silver);
  background: var(--graphite);
  border: 1px solid rgba(242, 242, 242, 0.14);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}

.filter-tab:hover {
  color: var(--white);
  border-color: var(--gold);
}

.filter-tab.is-active,
.filter-tab[aria-pressed="true"] {
  color: #fff;
  background: var(--red);
  border-color: var(--red);
}

.is-hidden {
  display: none !important;
}

[hidden] {
  display: none !important;
}

.toc {
  padding: 1.5rem;
  background: var(--graphite);
  border: 1px solid rgba(242, 242, 242, 0.08);
  border-left: 4px solid var(--red);
}

.toc__list {
  counter-reset: toc;
}

.toc__link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 0;
  font-size: 0.9rem;
  color: var(--silver);
  border-bottom: 1px dashed rgba(242, 242, 242, 0.08);
  transition: color 0.2s, padding-left 0.2s;
}

.toc__link::before {
  counter-increment: toc;
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--gold);
  border: 1px solid rgba(212, 175, 55, 0.5);
  padding: 0.1rem 0.35rem;
}

.toc__link:hover {
  color: var(--gold);
  padding-left: 0.4rem;
}

.accordion__item {
  margin-bottom: 0.8rem;
  background: var(--graphite);
  border: 1px solid rgba(242, 242, 242, 0.08);
  border-left: 3px solid var(--red);
}

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem 1.3rem;
  text-align: left;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--white);
}

.accordion__icon {
  flex-shrink: 0;
  margin-left: 1rem;
  color: var(--gold);
  transition: transform 0.3s var(--ease);
}

.accordion__item.is-open .accordion__icon {
  transform: rotate(45deg);
}

.accordion__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease);
}

.accordion__panel-inner {
  padding: 0 1.3rem 1.2rem;
  font-size: 0.88rem;
  color: var(--silver);
}

.accordion__item.is-open .accordion__panel {
  max-height: 720px;
}

.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, var(--graphite) 0%, #0B0B0F 100%);
  border: 1px solid rgba(242, 242, 242, 0.08);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.media-frame::before {
  content: attr(data-caption);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1.2rem;
  text-align: center;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--silver);
  background:
    linear-gradient(90deg, rgba(200, 16, 46, 0.12) 1px, transparent 1px),
    linear-gradient(0deg, rgba(200, 16, 46, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
}

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

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(50px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

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

@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;
    scroll-behavior: auto !important;
  }

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