:root {
  --bg-black: #1A1614;
  --cream: #F5E9D8;
  --red-orange: #E8590C;
  --deep-brown: #3E2F1D;
  --neon-purple: #7C3AED;
  --neon-cyan: #00D4FF;
  --gray: #8A8580;
  --dark-red: #A61E1E;
  --font-head: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "PingFang SC", "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --header-h: 5rem;
  --container-w: 1280px;
  --grid-gap: 1.25rem;
  --transition: 0.28s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--cream);
  background-color: var(--bg-black);
  background-image:
    repeating-linear-gradient(0deg, rgba(124, 58, 237, 0.03) 0px, rgba(124, 58, 237, 0.03) 1px, transparent 1px, transparent 44px),
    repeating-linear-gradient(90deg, rgba(0, 212, 255, 0.022) 0px, rgba(0, 212, 255, 0.022) 1px, transparent 1px, transparent 44px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--neon-purple);
}

ul, ol {
  list-style: none;
}

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

input {
  font-family: inherit;
}

::selection {
  background: var(--neon-purple);
  color: var(--cream);
}

:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  background: var(--neon-cyan);
  color: var(--bg-black);
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 22, 20, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--deep-brown);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  z-index: 20;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple), var(--red-orange));
  pointer-events: none;
}

.header-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: var(--header-h);
  position: relative;
  z-index: 2;
}

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

.brand-mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  background: var(--red-orange);
  color: var(--bg-black);
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  clip-path: polygon(0 0, 78% 0, 100% 22%, 100% 100%, 22% 100%, 0 78%);
  overflow: hidden;
  flex-shrink: 0;
}

.brand-mark::before {
  content: "";
  position: absolute;
  top: -35%;
  left: 0;
  width: 100%;
  height: 30%;
  background: rgba(245, 233, 216, 0.28);
  transform: rotate(8deg);
  animation: scan-sweep 4.2s ease-in-out infinite;
}

.brand-mark::after {
  content: "瘦";
  position: absolute;
  left: 3px;
  top: 2px;
  color: var(--neon-cyan);
  opacity: 0;
  line-height: 1;
}

.site-brand:hover .brand-mark::after {
  opacity: 0.65;
  animation: glitch-pulse 0.6s steps(2, jump-none) infinite;
}

@keyframes scan-sweep {
  0%, 52% { top: -35%; }
  82%, 100% { top: 120%; }
}

@keyframes glitch-pulse {
  0% { transform: translate(-3px, 2px); clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%); }
  50% { transform: translate(3px, -2px); clip-path: polygon(0 60%, 100% 60%, 100% 100%, 0 100%); }
  100% { transform: translate(-2px, 1px); clip-path: polygon(0 20%, 100% 20%, 100% 65%, 0 65%); }
}

.brand-text {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cream);
  white-space: nowrap;
}

.search-wrap {
  position: relative;
  flex: 0 1 340px;
  min-width: 0;
}

.search-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.search-input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.4rem;
  background: var(--deep-brown);
  border: 1px solid var(--deep-brown);
  border-radius: 999px;
  color: var(--cream);
  font-size: 0.875rem;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color var(--transition), background var(--transition);
}

.search-input::placeholder {
  color: var(--gray);
  opacity: 1;
}

.search-input:focus {
  outline: none;
  border-color: var(--neon-cyan);
  background: #2A221C;
}

.search-icon {
  position: absolute;
  left: 0.95rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0.9rem;
  height: 0.9rem;
  border: 2px solid var(--gray);
  border-radius: 50%;
  pointer-events: none;
  transition: border-color 0.2s;
}

.search-icon::after {
  content: "";
  position: absolute;
  width: 2px;
  height: 0.45rem;
  background: var(--gray);
  right: -0.2rem;
  bottom: -0.28rem;
  border-radius: 2px;
  transform: rotate(-45deg);
  transition: background 0.2s;
}

.search-input:focus + .search-icon {
  border-color: var(--neon-cyan);
}

.search-input:focus + .search-icon::after {
  background: var(--neon-cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.member-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.85rem;
  border: 1px solid var(--deep-brown);
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--gray);
  white-space: nowrap;
}

.member-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-purple);
  box-shadow: 0 0 6px var(--neon-purple);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 44px;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--deep-brown);
  border-radius: var(--radius-sm);
  background: rgba(62, 47, 29, 0.4);
  transition: border-color 0.2s, background 0.2s;
}

.nav-toggle:hover {
  border-color: var(--neon-purple);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--cream);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle-text {
  font-size: 0.65rem;
  color: var(--gray);
  letter-spacing: 0.1em;
}

.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-nav {
  border-top: 1px dashed rgba(138, 133, 128, 0.35);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
}

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.15rem;
  counter-reset: nav-index;
}

.nav-item {
  counter-increment: nav-index;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--cream);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.nav-link::before {
  content: "0" counter(nav-index);
  font-family: "SF Mono", Consolas, "Courier New", monospace;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--neon-cyan);
  opacity: 0.65;
}

.nav-link:hover {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 212, 255, 0.06);
}

.nav-link[aria-current="page"] {
  color: var(--red-orange);
  border-bottom-color: var(--red-orange);
  background: rgba(232, 89, 12, 0.08);
  font-weight: 700;
}

.nav-link[aria-current="page"]::before {
  color: var(--red-orange);
  opacity: 1;
}

.nav-aside {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--gray);
  white-space: nowrap;
  letter-spacing: 0.08em;
}

.nav-aside-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan);
  flex-shrink: 0;
  animation: pulse-dot 2.6s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.page-container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--cream);
  margin-bottom: var(--space-sm);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--cream);
  margin-bottom: var(--space-md);
}

.section-title::before {
  content: "";
  width: 0.8rem;
  height: 1.7rem;
  background: var(--red-orange);
  flex-shrink: 0;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 82%);
}

.subtitle {
  display: block;
  font-size: 0.75em;
  font-weight: 400;
  color: var(--gray);
  letter-spacing: 0.06em;
}

.breadcrumb {
  padding: var(--space-sm) 0;
  font-size: 0.85rem;
  color: var(--gray);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--gray);
  margin-right: 0.4rem;
}

.breadcrumb-link {
  color: var(--gray);
  transition: color 0.2s;
}

.breadcrumb-link:hover {
  color: var(--neon-cyan);
}

.breadcrumb-item[aria-current="page"] {
  color: var(--cream);
  font-weight: 600;
}

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

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

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

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

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  transition: background 0.25s, border-color 0.25s, color 0.25s, transform 0.25s;
}

.btn-primary {
  background: var(--red-orange);
  color: var(--bg-black);
}

.btn-primary:hover {
  background: #F0651E;
  color: var(--bg-black);
  transform: translateY(-2px);
}

.btn-outline {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.1);
  color: var(--neon-cyan);
  transform: translateY(-2px);
}

.card {
  position: relative;
  padding: var(--space-md);
  background: var(--deep-brown);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
}

.card:hover {
  border-color: var(--neon-purple);
  background: #33271E;
  transform: translateY(-4px);
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 3.2rem;
  height: 3.2rem;
  background: linear-gradient(225deg, var(--neon-purple), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover::after {
  opacity: 0.28;
}

.card-title {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 0.5rem;
}

.card-text {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.6;
}

.img-frame {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--deep-brown);
  aspect-ratio: 16 / 9;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(245, 233, 216, 0.08);
  border-radius: inherit;
  pointer-events: none;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

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

.site-footer {
  position: relative;
  margin-top: var(--space-xl);
  background: var(--deep-brown);
  border-top: 3px solid var(--red-orange);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--neon-cyan), transparent 55%, var(--neon-purple));
}

.footer-main {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: var(--space-lg);
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-lg) 1.5rem var(--space-md);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--cream);
}

.footer-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  background: var(--red-orange);
  color: var(--bg-black);
  font-size: 1.3rem;
  font-weight: 700;
  clip-path: polygon(0 0, 78% 0, 100% 22%, 100% 100%, 22% 100%, 0 78%);
  flex-shrink: 0;
}

.footer-about {
  margin-top: var(--space-sm);
  max-width: 30rem;
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.7;
}

.footer-heading {
  position: relative;
  margin-bottom: var(--space-sm);
  padding-bottom: 0.4rem;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--cream);
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2.4rem;
  height: 2px;
  background: var(--red-orange);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--gray);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-list a::before {
  content: "→";
  color: var(--neon-purple);
  font-size: 0.8em;
  transition: transform 0.2s;
}

.footer-list a:hover {
  color: var(--neon-cyan);
}

.footer-list a:hover::before {
  transform: translateX(3px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-contact li {
  position: relative;
  padding-left: 0.85rem;
  font-size: 0.85rem;
  color: var(--gray);
  line-height: 1.6;
}

.footer-contact li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--red-orange);
}

.footer-bottom {
  border-top: 1px solid rgba(138, 133, 128, 0.2);
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-sm) 1.5rem var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  text-align: center;
}

.trust-statement {
  max-width: 50rem;
  margin: 0 auto;
  font-size: 0.8rem;
  color: var(--gray);
}

.footer-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--gray);
}

.footer-copy,
.footer-icp {
  color: var(--gray);
}

.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--neon-purple);
  border-radius: var(--radius-sm);
  background: rgba(26, 22, 20, 0.88);
  color: var(--neon-cyan);
  font-size: 1.2rem;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s, border-color 0.2s, background 0.2s;
}

.back-to-top:hover {
  border-color: var(--neon-cyan);
  background: var(--neon-purple);
  color: var(--bg-black);
}

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

@media (max-width: 1024px) {
  .header-inner,
  .page-container,
  .footer-main,
  .footer-bottom {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% - 0.5rem);
    left: 1.25rem;
    right: 1.25rem;
    z-index: 5;
    background: var(--bg-black);
    border: 1px solid var(--deep-brown);
    border-radius: var(--radius-md);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.6);
    max-height: calc(100vh - 5rem);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    padding: 0.75rem;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.7rem 0.75rem;
    border-bottom: 1px solid rgba(138, 133, 128, 0.15);
  }

  .nav-aside {
    display: flex;
    padding: 0.5rem 0.75rem;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

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

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 640px) {
  .header-top {
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0.75rem 0;
    min-height: auto;
  }

  .site-brand {
    flex: 1 1 auto;
  }

  .brand-text {
    font-size: 1.1rem;
    letter-spacing: 0.08em;
  }

  .search-wrap {
    flex: 1 1 100%;
    order: 4;
  }

  .member-tag {
    display: none;
  }

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

  .footer-main {
    grid-template-columns: 1fr;
  }

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

  .footer-meta {
    flex-direction: column;
    gap: 0.4rem;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

@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 !important;
    transform: none !important;
  }

  .scroll-progress {
    display: none;
  }
}