:root {
  --bg: #0A0E17;
  --surface: #131B2E;
  --surface-2: #1A2539;
  --line: #2A3A52;
  --line-soft: rgba(42, 58, 82, 0.55);
  --cyan: #00E5FF;
  --purple: #B537F2;
  --green: #39FF14;
  --gold: #F5D76E;
  --warning: #FF5E3A;
  --text-main: #FFFFFF;
  --text-2: #B0BEC5;
  --font-headline: 'Impact', 'Oswald', 'Arial Black', '思源黑体 Heavy', sans-serif;
  --font-body: 'Microsoft YaHei', 'PingFang SC', 'Noto Sans SC', sans-serif;
  --container: 1240px;
  --fs-xl: clamp(2.5rem, 5vw, 4rem);
  --fs-lg: clamp(1.8rem, 3vw, 2.5rem);
  --fs-md: clamp(1.2rem, 2vw, 1.5rem);
  --fs-sm: 1rem;
  --fs-xs: 0.85rem;
  --ease: 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --shadow-card: 0 10px 24px rgba(2, 6, 16, 0.35);
  --shadow-cyan: 0 12px 32px rgba(0, 229, 255, 0.08);
  --clip-notch: 12px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 480px at 88% -12%, rgba(181, 55, 242, 0.12), transparent 60%),
    radial-gradient(900px 420px at 2% -16%, rgba(0, 229, 255, 0.08), transparent 55%),
    var(--bg);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-headline);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

p { margin: 0; }

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

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

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

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

table { border-collapse: collapse; width: 100%; }

[hidden] { display: none !important; }

::selection { background: rgba(0, 229, 255, 0.28); color: var(--text-main); }

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(245, 215, 110, 0.12);
}

#main-content { position: relative; z-index: 1; display: block; min-height: 65vh; }

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section {
  padding-block: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line-soft);
}
.section--tight { padding-block: clamp(2rem, 4vw, 3rem); }
.section--alt { background: rgba(19, 27, 46, 0.35); }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-bottom: 2rem;
}
.section__title { font-size: var(--fs-lg); color: var(--text-main); }
.section__aside { max-width: 36ch; font-size: 0.9rem; line-height: 1.8; color: var(--text-2); }

.grid { display: grid; gap: clamp(1rem, 2vw, 1.5rem); }
.grid--2, .grid--3, .grid--6 { grid-template-columns: 1fr; }
@media (min-width: 768px) {
  .grid--2, .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--6 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--6 { grid-template-columns: repeat(6, 1fr); }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-headline);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  min-height: 44px;
  padding: 0.7rem 1.35rem;
  background: var(--cyan);
  color: #0A0E17;
  border: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--clip-notch)), calc(100% - var(--clip-notch)) 100%, 0 100%);
  font-family: var(--font-headline);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: filter var(--ease), transform var(--ease), background var(--ease), color var(--ease);
}
.btn:hover { filter: brightness(1.12); transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--cyan); color: #0A0E17; }
.btn--ghost {
  background: transparent;
  color: var(--cyan);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.6);
}
.btn--ghost:hover { background: rgba(0, 229, 255, 0.08); color: var(--cyan); }
.btn--sm { min-height: 36px; padding: 0.45rem 0.9rem; font-size: 0.75rem; --clip-notch: 8px; }
.btn--block { display: flex; width: 100%; }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: clamp(1.2rem, 2.4vw, 1.6rem);
  background: linear-gradient(160deg, rgba(19, 27, 46, 0.88), rgba(10, 14, 23, 0.92));
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  opacity: 0;
  transition: opacity var(--ease);
}
.card:hover { border-color: rgba(0, 229, 255, 0.5); box-shadow: var(--shadow-cyan); transform: translateY(-2px); }
.card:hover::before { opacity: 1; }
.card__title { font-size: 1.15rem; color: var(--text-main); line-height: 1.25; }
.card__text { font-size: 0.9rem; line-height: 1.8; color: var(--text-2); }
.card__meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: auto; padding-top: 0.5rem; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 24px;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--line);
  background: rgba(19, 27, 46, 0.7);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--text-2);
}
.tag--cyan { border-color: rgba(0, 229, 255, 0.45); color: var(--cyan); }
.tag--purple { border-color: rgba(181, 55, 242, 0.45); color: var(--purple); }
.tag--gold { border-color: rgba(245, 215, 110, 0.45); color: var(--gold); }
.tag--green { border-color: rgba(57, 255, 20, 0.4); color: var(--green); }

.divider {
  height: 1px;
  border: 0;
  margin: 2rem 0;
  background: linear-gradient(90deg, var(--cyan), var(--line) 40%, transparent 92%);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  padding-block: 1.1rem;
  font-size: 0.85rem;
  color: var(--text-2);
}
.breadcrumb a { color: var(--cyan); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb li + li::before { content: "/"; margin-right: 0.75rem; color: var(--line); }

.prose { max-width: 72ch; font-size: 1rem; line-height: 1.9; color: rgba(255, 255, 255, 0.86); }
.prose h2, .prose h3 { margin: 2rem 0 0.6rem; color: var(--text-main); letter-spacing: 0.04em; }
.prose h2 { font-size: var(--fs-md); }
.prose h3 { font-size: 1.05rem; }
.prose p { margin-bottom: 1.1rem; }
.prose ul { margin-bottom: 1.1rem; }
.prose ul li { position: relative; padding-left: 1.2rem; margin-bottom: 0.45rem; }
.prose ul li::before { content: "▸"; position: absolute; left: 0; color: var(--cyan); }
.prose ol { margin-bottom: 1.1rem; padding-left: 1.6rem; list-style: decimal; }
.prose a { color: var(--cyan); text-underline-offset: 4px; }
.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.8rem 1.2rem;
  border-left: 3px solid var(--purple);
  background: rgba(181, 55, 242, 0.06);
  color: var(--text-2);
}
.prose blockquote p { margin-bottom: 0; }

.data-table { font-size: 0.88rem; }
.data-table th {
  padding: 0.75rem 0.6rem;
  border-bottom: 2px solid var(--cyan);
  font-family: var(--font-headline);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: left;
  color: var(--text-main);
}
.data-table td {
  padding: 0.7rem 0.6rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text-2);
}
.data-table tr:hover td { color: var(--text-main); background: rgba(0, 229, 255, 0.05); }

.frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(19, 27, 46, 0.9), rgba(10, 14, 23, 0.95)),
    repeating-linear-gradient(0deg, rgba(42, 58, 82, 0.4) 0 1px, transparent 1px 14px),
    repeating-linear-gradient(90deg, rgba(42, 58, 82, 0.4) 0 1px, transparent 1px 14px);
}
.frame::after {
  content: "";
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 14px;
  height: 14px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  opacity: 0.8;
  pointer-events: none;
}
.frame--wide { aspect-ratio: 21 / 9; }
.frame--tall { aspect-ratio: 4 / 5; }
.frame--square { aspect-ratio: 1 / 1; }
.frame img { width: 100%; height: 100%; object-fit: cover; }
.frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.45rem 0.8rem;
  background: rgba(10, 14, 23, 0.78);
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  color: var(--text-2);
}

.online-dot {
  flex: none;
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.7);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1000;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 1200;
  padding: 0.7rem 1.2rem;
  background: var(--gold);
  color: #0A0E17;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  transform: translateY(calc(-100% - 16px));
  transition: transform var(--ease);
}
.skip-link:hover { text-decoration: none; }
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: relative;
  z-index: 10;
  background:
    radial-gradient(760px 280px at 82% -30%, rgba(181, 55, 242, 0.16), transparent 60%),
    radial-gradient(720px 300px at 6% -50%, rgba(0, 229, 255, 0.13), transparent 55%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 20%, var(--purple) 60%, transparent);
  pointer-events: none;
}

.masthead-meta {
  border-bottom: 1px solid var(--line-soft);
  background: rgba(19, 27, 46, 0.5);
  font-size: 0.78rem;
  color: var(--text-2);
}
.masthead-meta__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  min-height: 36px;
}
.masthead-meta__item { display: inline-flex; align-items: center; gap: 0.5rem; letter-spacing: 0.05em; }
.masthead-meta__sep { width: 2px; height: 10px; background: var(--line); flex: none; }
.masthead-meta__club { margin-left: auto; letter-spacing: 0.12em; color: var(--text-2); }

.masthead {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem 1.5rem;
  padding-block: clamp(1.25rem, 2.4vw, 1.9rem);
}
.masthead__index,
.masthead__edition {
  display: none;
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-2);
}

.brand { display: inline-flex; align-items: center; gap: 0.8rem; justify-self: start; }
.brand:hover { text-decoration: none; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.1), rgba(181, 55, 242, 0.1));
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.brand__text { display: flex; flex-direction: column; justify-content: center; line-height: 1; }
.brand__name {
  font-family: var(--font-headline);
  font-size: clamp(1.55rem, 3vw, 2rem);
  letter-spacing: 0.05em;
  color: var(--text-main);
}
.brand__tagline {
  display: block;
  margin-top: 0.32rem;
  font-size: 0.66rem;
  letter-spacing: 0.34em;
  color: var(--cyan);
  text-transform: uppercase;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  background: rgba(19, 27, 46, 0.6);
  cursor: pointer;
  transition: border-color var(--ease), background var(--ease);
}
.nav-toggle:hover { border-color: rgba(0, 229, 255, 0.55); background: var(--surface-2); }
.nav-toggle__line {
  width: 20px;
  height: 2px;
  background: var(--cyan);
  transform-origin: center;
  transition: transform 180ms ease, opacity 180ms ease, background 180ms ease;
}
[data-nav-toggle][aria-expanded="true"] .nav-toggle__line:nth-child(1) { transform: translateY(8px) rotate(45deg); background: var(--purple); }
[data-nav-toggle][aria-expanded="true"] .nav-toggle__line:nth-child(2) { opacity: 0; }
[data-nav-toggle][aria-expanded="true"] .nav-toggle__line:nth-child(3) { transform: translateY(-8px) rotate(-45deg); background: var(--purple); }

.site-nav { display: none; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.site-nav[data-open] {
  display: block;
  margin-top: 0.65rem;
  padding: 0.25rem 0.75rem 0.8rem;
  background: rgba(10, 14, 23, 0.92);
}
.nav-list { display: grid; }
.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 48px;
  padding: 0.6rem 0.15rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text-main);
  font-family: var(--font-headline);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-link:hover { color: var(--cyan); text-decoration: none; }
.nav-link__index {
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
.nav-link[aria-current="page"] {
  color: var(--cyan);
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.1), transparent 75%);
  box-shadow: inset 3px 0 0 var(--cyan);
}
.nav-cta { display: flex; width: 100%; margin: 1rem 0 0.35rem; }

@media (min-width: 1024px) {
  .masthead { grid-template-columns: 1fr auto 1fr; }
  .masthead__index { display: block; justify-self: start; }
  .masthead__edition { display: block; justify-self: end; text-align: right; }
  .brand { grid-column: 2; grid-row: 1; justify-self: center; }
  .nav-toggle { display: none; }

  .site-nav,
  .site-nav[data-open] {
    display: flex;
    align-items: center;
    margin-top: 0;
    padding: 0;
    background: transparent;
  }
  .nav-list { display: flex; align-items: center; margin-inline: auto; gap: 0.2rem; }
  .nav-link {
    min-height: 52px;
    padding: 0.65rem 1rem;
    border-bottom: 0;
    font-size: 0.85rem;
  }
  .nav-link::after {
    content: "";
    position: absolute;
    left: 1rem;
    right: 1rem;
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan), var(--purple));
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 180ms ease;
  }
  .nav-link:hover::after { transform: scaleX(1); }
  .nav-link[aria-current="page"] { background: transparent; box-shadow: none; color: var(--cyan); }
  .nav-link[aria-current="page"]::after { transform: scaleX(1); }
  .nav-cta { display: inline-flex; width: auto; margin: 0 0 0 1rem; }
}

.site-footer {
  position: relative;
  margin-top: clamp(3rem, 6vw, 5rem);
  background:
    radial-gradient(880px 360px at 15% 130%, rgba(181, 55, 242, 0.13), transparent 60%),
    radial-gradient(760px 320px at 92% -15%, rgba(0, 229, 255, 0.1), transparent 55%),
    var(--bg);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--purple) 42%, transparent 72%);
  pointer-events: none;
}

.footer-main {
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-block: clamp(3rem, 6vw, 4.5rem) clamp(2.5rem, 4vw, 3.25rem);
}
.footer-brand { max-width: 48ch; }
.footer-brand__logo { display: inline-flex; margin-bottom: 1.15rem; }
.footer-brand__logo:hover { text-decoration: none; }
.footer-brand__name {
  font-family: var(--font-headline);
  font-size: 1.8rem;
  letter-spacing: 0.06em;
  line-height: 1.05;
  color: var(--text-main);
}
.footer-brand__en {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.68rem;
  letter-spacing: 0.32em;
  color: var(--cyan);
  text-transform: uppercase;
}
.footer-brand__statement { margin-top: 1rem; font-size: 1rem; line-height: 1.8; color: var(--text-main); }
.footer-brand__note {
  margin-top: 1.1rem;
  padding: 0.8rem 1rem;
  border-left: 2px solid var(--gold);
  background: linear-gradient(90deg, rgba(245, 215, 110, 0.06), transparent 70%);
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-2);
}

.footer-column { min-width: 0; }
.footer-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.1rem;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--text-main);
}
.footer-heading__no {
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--purple);
}
.footer-list { display: grid; gap: 0.15rem; }
.footer-list a {
  display: inline-block;
  padding: 0.32rem 0;
  color: var(--text-2);
  transition: color var(--ease), padding-left var(--ease);
}
.footer-list a:hover { color: var(--cyan); padding-left: 6px; text-decoration: none; }
.footer-list--contact li { padding: 0.32rem 0; font-size: 0.88rem; line-height: 1.7; color: var(--text-2); }
.footer-contact__note {
  margin-top: 0.9rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--line);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--text-2);
}

.footer-legal { border-top: 1px solid var(--line-soft); background: rgba(8, 12, 18, 0.65); }
.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 1rem;
  padding-block: 1rem 1.15rem;
  font-size: 0.8rem;
  color: var(--text-2);
}
.footer-legal a { color: var(--text-2); border-bottom: 1px solid transparent; transition: color var(--ease), border-color var(--ease); }
.footer-legal a:hover { color: var(--cyan); border-color: var(--cyan); text-decoration: none; }
.footer-legal__sep { width: 2px; height: 12px; background: var(--line); flex: none; }

@media (min-width: 680px) {
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (min-width: 1080px) {
  .footer-main { grid-template-columns: 1.4fr 1fr 1.2fr 1fr; }
  .footer-brand { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0s !important;
  }
  .scroll-progress { display: none; }
}