:root {
  --canvas: #0B0D17;
  --deep: #1C1B4B;
  --violet: #6D5AF0;
  --mint: #18E0C8;
  --orange: #FF8A1E;
  --gold: #F5C542;
  --surface: #12162A;
  --raised: #1A1F35;
  --ink: #F2F3F7;
  --ink-soft: #A8ABC3;
  --border: rgba(242, 243, 247, 0.1);
  --border-strong: rgba(242, 243, 247, 0.22);
  --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;
  --shadow-hard: 5px 5px 0 rgba(0, 0, 0, 0.4);
  --content-max: 1440px;
  --header-h: 76px;
}

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

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

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

a {
  color: var(--mint);
  text-decoration: none;
  transition: color .25s ease, border-color .25s ease, background-color .25s ease;
}

a:hover {
  color: var(--gold);
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.15;
  color: var(--ink);
  font-weight: 700;
}

p {
  margin-bottom: 1em;
}

:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 2px;
}

#main-content {
  min-height: 45vh;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 999;
  background: var(--mint);
  color: var(--canvas);
  font-weight: 700;
  padding: 12px 20px;
}

.skip-link:focus {
  left: 0;
  top: 0;
  outline: 3px solid var(--violet);
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: clamp(48px, 7vw, 96px);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 14px;
  margin-bottom: 28px;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.section-title {
  font-size: clamp(28px, 3.2vw, 44px);
  font-weight: 800;
  line-height: 1.08;
}

.section-extra {
  margin-left: auto;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.span-3 {
  grid-column: span 3;
}

.span-4 {
  grid-column: span 4;
}

.span-5 {
  grid-column: span 5;
}

.span-6 {
  grid-column: span 6;
}

.span-8 {
  grid-column: span 8;
}

.span-12 {
  grid-column: span 12;
}

.bento-card {
  position: relative;
  background: var(--surface);
  border: 2px solid var(--border);
  padding: 28px;
  box-shadow: var(--shadow-hard);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.bento-card:hover {
  transform: translate(-2px, -2px);
  border-color: var(--violet);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.42);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease, border-color .2s ease, color .2s ease;
  text-align: center;
}

.btn-primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--canvas);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.3);
}

.btn-primary:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.3);
  color: var(--canvas);
}

.btn-outline {
  background: transparent;
  border-color: var(--violet);
  color: var(--mint);
}

.btn-outline:hover {
  background: rgba(109, 90, 240, 0.15);
  color: var(--mint);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--ink);
  white-space: nowrap;
}

.tag-gold {
  background: var(--gold);
  color: var(--canvas);
  border-color: var(--gold);
}

.tag-mint {
  background: var(--mint);
  color: var(--canvas);
  border-color: var(--mint);
}

.tag-orange {
  background: var(--orange);
  color: var(--canvas);
  border-color: var(--orange);
}

details.faq-item {
  background: var(--surface);
  border: 2px solid var(--border);
  padding: 18px 22px;
  transition: border-color .25s ease, box-shadow .25s ease;
}

details.faq-item[open] {
  border-color: var(--violet);
  box-shadow: var(--shadow-hard);
}

details.faq-item summary {
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  color: var(--ink);
  position: relative;
}

details.faq-item summary::-webkit-details-marker {
  display: none;
}

details.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--mint);
  transition: transform .25s ease;
}

details.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--deep) 0%, var(--surface) 75%);
  border: 1px solid var(--border);
  aspect-ratio: 16 / 9;
}

.media::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(110deg, rgba(109, 90, 240, 0.18) 0%, transparent 30%, transparent 68%, rgba(24, 224, 200, 0.12) 100%);
  pointer-events: none;
}

.media::after {
  content: '';
  position: absolute;
  right: -20%;
  bottom: -30%;
  width: 40%;
  height: 60%;
  background: rgba(245, 197, 66, 0.08);
  transform: rotate(-18deg);
  pointer-events: none;
}

.media-sq {
  aspect-ratio: 1 / 1;
}

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

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 20px 24px 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.breadcrumb::before {
  content: '当前页码';
  color: var(--violet);
  font-weight: 700;
  font-family: var(--font-mono);
}

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

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

.breadcrumb .sep {
  color: var(--ink-soft);
}

.breadcrumb .current {
  color: var(--ink);
  font-weight: 600;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--border);
}

.header-topline {
  height: 4px;
  background: linear-gradient(90deg, var(--mint) 0%, var(--violet) 48%, var(--orange) 100%);
}

.header-inner {
  position: relative;
  max-width: var(--content-max);
  margin-inline: auto;
  height: var(--header-h);
  padding-inline: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  padding-right: 20px;
  border-right: 2px solid var(--gold);
}

.brand-crown {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--orange);
  color: var(--canvas);
  font-size: 20px;
  font-weight: 900;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.4);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 50% 100%, 0 74%);
}

.brand-words {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--ink);
  white-space: nowrap;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
  margin-top: 2px;
}

.site-nav {
  margin-left: auto;
  border-left: 2px solid var(--violet);
  padding-left: 26px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 9px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  position: relative;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--mint);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}

.nav-link[aria-current="page"] {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

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

.nav-link.is-active {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 20px;
  border-left: 1px solid var(--border);
}

.btn-fav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 16px;
  border: 2px solid var(--violet);
  background: var(--raised);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  transition: background-color .25s ease, border-color .25s ease, color .25s ease, transform .25s ease;
}

.btn-fav:hover {
  border-color: var(--mint);
  background: rgba(24, 224, 200, 0.08);
  color: var(--mint);
}

.fav-star {
  font-size: 18px;
  color: var(--gold);
  display: inline-block;
  transition: transform .25s ease;
}

.btn-fav.is-faved {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--canvas);
}

.btn-fav.is-faved .fav-star {
  color: var(--canvas);
  transform: scale(1.2);
}

.btn-login {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 16px;
  background: var(--orange);
  color: var(--canvas);
  font-size: 13px;
  font-weight: 700;
  border: 2px solid var(--orange);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.35);
  transition: transform .2s ease, box-shadow .2s ease;
}

.btn-login:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.35);
  color: var(--canvas);
}

.login-ico {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 900;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: var(--raised);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
}

.toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.toggle-bars::before,
.toggle-bars::after {
  content: '';
  height: 2px;
  width: 100%;
  background: var(--mint);
  transition: transform .25s ease;
}

.nav-toggle[aria-expanded="true"] .toggle-bars::before {
  transform: translateY(3px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .toggle-bars::after {
  transform: translateY(-3px) rotate(-45deg);
}

.progress-track {
  height: 3px;
  background: rgba(242, 243, 247, 0.05);
  overflow: hidden;
}

.progress-fill {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--violet), var(--mint));
  transition: width .08s linear;
}

.site-footer {
  position: relative;
  margin-top: 96px;
  background: var(--deep);
  border-top: 3px solid var(--violet);
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 120px;
  height: 100%;
  background: linear-gradient(180deg, rgba(24, 224, 200, 0.08), transparent 60%);
  pointer-events: none;
}

.footer-grid {
  position: relative;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 64px 24px 40px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 48px;
}

.footer-intro {
  min-width: 0;
}

.footer-brand {
  font-size: 34px;
  font-weight: 800;
  color: var(--ink);
  line-height: 1.1;
}

.footer-brand-en {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mint);
  margin-top: 4px;
}

.footer-tagline {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
  margin-top: 18px;
}

.footer-trust {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  padding: 8px 14px;
  background: rgba(24, 224, 200, 0.1);
  border: 1px solid rgba(24, 224, 200, 0.3);
  font-size: 12px;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}

.heading-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
}

.footer-links li,
.footer-contact li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--ink-soft);
  padding-left: 12px;
  border-left: 2px solid transparent;
  transition: all .25s ease;
}

.footer-links a:hover {
  color: var(--mint);
  border-left-color: var(--mint);
  padding-left: 16px;
}

.footer-contact li {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 18px;
}

.legal-links a {
  color: var(--ink-soft);
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.legal-links a:hover {
  color: var(--gold);
}

.footer-mark {
  font-family: var(--font-display);
  font-size: clamp(72px, 15vw, 200px);
  font-weight: 900;
  line-height: 0.75;
  letter-spacing: -0.02em;
  color: rgba(242, 243, 247, 0.05);
  -webkit-text-stroke: 1px rgba(242, 243, 247, 0.12);
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 36px 24px 8px;
  user-select: none;
  pointer-events: none;
}

.footer-bottom {
  position: relative;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 22px 24px 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--ink-soft);
}

.copyright {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.footer-meta {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  opacity: 0.7;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}

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

@media (max-width: 1199px) and (min-width: 768px) {
  .brand-name {
    font-size: 17px;
  }

  .brand-sub {
    display: none;
  }

  .nav-link {
    padding: 8px 8px;
    font-size: 13px;
  }

  .nav-index {
    display: none;
  }

  .btn-fav .fav-label,
  .btn-login .login-label {
    display: none;
  }

  .btn-fav,
  .btn-login {
    padding: 8px 10px;
  }
}

@media (max-width: 991px) {
  .grid-12 {
    gap: 16px;
  }

  .span-3,
  .span-4 {
    grid-column: span 6;
  }

  .span-5 {
    grid-column: span 12;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    padding: 48px 24px 32px;
  }

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

@media (max-width: 767px) {
  .container {
    padding-inline: 16px;
  }

  .brand {
    padding-right: 12px;
    border-right: 1px solid var(--border);
  }

  .brand-crown {
    width: 38px;
    height: 38px;
    font-size: 17px;
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-sub {
    font-size: 9px;
  }

  .header-inner {
    height: 64px;
    padding-inline: 16px;
    gap: 12px;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 3px);
    left: 0;
    right: 0;
    display: none;
    margin-left: 0;
    padding: 12px 16px 20px;
    background: var(--surface);
    border-left: none;
    border-bottom: 3px solid var(--violet);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.55);
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-link {
    padding: 13px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 15px;
  }

  .nav-link[aria-current="page"] {
    background: rgba(24, 224, 200, 0.1);
  }

  .header-actions {
    margin-left: auto;
    padding-left: 0;
    border-left: none;
  }

  .btn-login {
    display: none;
  }

  .btn-fav {
    width: 44px;
    height: 44px;
    padding: 0;
    justify-content: center;
  }

  .fav-label {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .progress-track {
    height: 2px;
  }

  .grid-12 {
    grid-template-columns: 1fr;
  }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-8,
  .span-12 {
    grid-column: 1 / -1;
  }

  .site-footer {
    margin-top: 64px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 28px;
  }

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

  .footer-brand {
    font-size: 28px;
  }

  .footer-mark {
    display: none;
  }

  .footer-bottom {
    padding: 18px 16px 24px;
    justify-content: center;
  }

  .footer-meta {
    display: none;
  }
}

@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;
  }
}