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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-body);
  background-color: var(--bg-deep);
  background-image:
    radial-gradient(ellipse at 80% 0%, rgba(29, 52, 97, 0.45), transparent 60%),
    radial-gradient(ellipse at 8% 100%, rgba(0, 255, 135, 0.045), transparent 50%);
  min-height: 100vh;
  overflow-x: hidden;
}

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

button {
  font-family: inherit;
  color: inherit;
}

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

a:hover {
  color: var(--accent-cyan);
}

ul,
ol {
  list-style-position: inside;
}

:root {
  --bg-deep: #0A192F;
  --bg-panel: #112240;
  --bg-card: #1D3461;
  --accent: #00FF87;
  --accent-gold: #FFD700;
  --accent-cyan: #64FFDA;
  --text-primary: #FFFFFF;
  --text-body: #A8B2D1;
  --font-head: "Archivo Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  --container: 1200px;
  --header-top-h: 60px;
  --header-bottom-h: 48px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --shadow-panel: 0 12px 40px rgba(0, 0, 0, 0.35);
  --transition: 280ms cubic-bezier(0.23, 1, 0.32, 1);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  text-rendering: optimizeLegibility;
}

h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 900;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.7rem);
}

p + p {
  margin-top: 1em;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

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

::selection {
  background: rgba(0, 255, 135, 0.3);
  color: var(--text-primary);
}

#main-content {
  scroll-margin-top: 72px;
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
}

.container-narrow {
  max-width: 780px;
  margin-inline: auto;
  padding-inline: clamp(18px, 3vw, 40px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-deep);
  box-shadow: 0 6px 20px rgba(0, 255, 135, 0.25);
}

.btn-primary:hover {
  background: var(--text-primary);
  color: var(--bg-deep);
}

.btn-ghost {
  background: transparent;
  color: var(--text-body);
  border-color: rgba(168, 178, 209, 0.3);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 255, 135, 0.06);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-gold);
  background: rgba(255, 215, 0, 0.08);
  border: 1px solid rgba(255, 215, 0, 0.25);
}

.tag-green {
  color: var(--accent);
  background: rgba(0, 255, 135, 0.06);
  border-color: rgba(0, 255, 135, 0.3);
}

.site-header {
  position: relative;
  z-index: 1000;
  background: var(--bg-deep);
  border-bottom: 1px solid rgba(168, 178, 209, 0.12);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-cyan) 55%, var(--accent-gold) 100%);
  z-index: 2;
  pointer-events: none;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 5000;
  padding: 10px 18px;
  background: var(--accent);
  color: var(--bg-deep);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 8px;
  transform: translateY(-150%);
  transition: transform 0.2s ease;
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 3000;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-cyan));
  pointer-events: none;
}

.header-top {
  height: var(--header-top-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-mark:hover .brand-text {
  color: var(--text-primary);
}

.brand-mark:hover .brand-slash {
  color: var(--accent-cyan);
}

.brand-number {
  font-family: var(--font-head);
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: 0.02em;
  text-shadow: 0 0 20px rgba(0, 255, 135, 0.3);
}

.brand-slash {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  transform: rotate(15deg) skewX(-8deg);
  margin-inline: 0 1px;
}

.brand-text {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-body);
  letter-spacing: 0.08em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chip-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-body);
  background: transparent;
  border: 1px solid rgba(168, 178, 209, 0.28);
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition);
}

.chip-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0, 255, 135, 0.08);
}

.chip-btn-accent {
  color: var(--bg-deep);
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 700;
}

.chip-btn-accent::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--bg-deep);
  margin-right: 4px;
  animation: blink 1.8s ease-in-out infinite;
}

.chip-btn-accent:hover {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--bg-deep);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(168, 178, 209, 0.25);
  border-radius: 10px;
  cursor: pointer;
  user-select: none;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

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

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

.header-bottom {
  position: relative;
  background: rgba(17, 34, 64, 0.92);
  border-top: 1px solid rgba(100, 255, 218, 0.08);
  border-bottom: 1px solid rgba(168, 178, 209, 0.1);
  overflow: visible;
}

.header-bottom::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 100%;
  background: linear-gradient(115deg, transparent 45%, rgba(255, 215, 0, 0.06) 45%, rgba(255, 215, 0, 0.06) 55%, transparent 55%);
  pointer-events: none;
}

.header-bottom-stack {
  display: flex;
  flex-direction: column;
}

.nav-slogan {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent-cyan);
  text-transform: uppercase;
  padding: 9px 0 5px;
  border-bottom: 1px solid rgba(168, 178, 209, 0.08);
  white-space: nowrap;
}

.nav-slogan::before {
  content: "//";
  font-family: var(--font-data);
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 0;
  margin-right: 4px;
}

.header-bottom-inner {
  display: flex;
  align-items: center;
  min-height: var(--header-bottom-h);
}

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

.main-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-body);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.main-nav a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}

.main-nav a[aria-current="page"] {
  color: var(--text-primary);
}

.main-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 5px;
  height: 3px;
  background: var(--accent);
  clip-path: polygon(10% 0, 90% 0, 100% 100%, 0 100%);
  border-radius: 1px;
}

.breadcrumb {
  position: relative;
  padding: 14px 0;
}

.breadcrumb::before {
  content: "";
  display: block;
  height: 3px;
  width: 32px;
  background: var(--accent);
  clip-path: polygon(0 0, 80% 0, 100% 100%, 20% 100%);
  margin-bottom: 8px;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
}

.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb-list li:not(:last-child)::after {
  content: "/";
  color: var(--accent);
  font-family: var(--font-data);
}

.breadcrumb-list a {
  color: var(--text-body);
  text-decoration: none;
}

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

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

.panel {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--radius-md);
  padding: clamp(18px, 4vw, 36px);
  box-shadow: var(--shadow-panel);
}

.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 36px;
  height: 36px;
  border-top: 3px solid var(--accent);
  border-left: 3px solid var(--accent);
  border-top-left-radius: var(--radius-md);
  pointer-events: none;
}

.panel + .panel {
  margin-top: 24px;
}

.panel-accent {
  border-bottom: 3px solid var(--accent-gold);
}

.panel-outline {
  background: transparent;
  box-shadow: none;
}

.section-head {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 24px;
}

.section-index {
  font-family: var(--font-data);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.12em;
  padding: 4px 12px;
  border: 1px solid rgba(0, 255, 135, 0.3);
  border-radius: 4px;
  white-space: nowrap;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.section-title {
  flex: 1 1 auto;
  margin: 0;
}

.section-desc {
  width: 100%;
  max-width: 640px;
  color: var(--text-body);
  font-size: 0.9rem;
  line-height: 1.6;
}

.score-text {
  font-family: var(--font-data);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  letter-spacing: 0.03em;
  text-shadow: 0 0 12px rgba(0, 255, 135, 0.15);
}

.score-text-green {
  color: var(--accent);
}

.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid rgba(168, 178, 209, 0.15);
  border-radius: var(--radius-md);
}

.img-frame > img,
.img-frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

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

.img-frame-ratio-16-9 {
  aspect-ratio: 16 / 9;
}

.img-frame-ratio-1-1 {
  aspect-ratio: 1 / 1;
}

.slash-divider {
  height: 10px;
  background: repeating-linear-gradient(
    115deg,
    transparent 0,
    transparent 8px,
    rgba(0, 255, 135, 0.5) 8px,
    rgba(0, 255, 135, 0.5) 10px
  );
}

.site-footer {
  position: relative;
  background: #071222;
  margin-top: 80px;
}

.footer-slash {
  height: 6px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-cyan) 50%, var(--accent-gold) 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 60px) 100%, 0 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1.1fr 1fr;
  gap: 40px;
  padding-block: 52px 36px;
}

.footer-brand .brand-mark {
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.7;
  max-width: 360px;
}

.footer-trust {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--text-body);
  opacity: 0.85;
  line-height: 1.6;
  max-width: 360px;
}

.trust-icon {
  flex-shrink: 0;
  position: relative;
  width: 15px;
  height: 17px;
  margin-top: 2px;
  border: 2px solid var(--accent);
  border-radius: 9px 9px 9px 3px;
  display: inline-block;
}

.trust-icon::after {
  content: "\2713";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}

.footer-col-title {
  font-family: var(--font-body);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-body);
  font-size: 0.86rem;
  padding: 4px 0;
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-col a:hover {
  color: var(--accent);
  padding-left: 6px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.footer-phone {
  font-family: var(--font-data);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.footer-email {
  font-family: var(--font-data);
  font-size: 0.82rem;
  color: var(--accent-cyan);
  word-break: break-all;
}

.footer-addr {
  font-size: 0.84rem;
  color: var(--text-body);
  margin-top: 6px;
}

.footer-note {
  font-size: 0.76rem;
  color: var(--text-body);
  opacity: 0.7;
  line-height: 1.6;
  max-width: 280px;
  margin-top: 6px;
}

.footer-bar {
  border-top: 1px solid rgba(168, 178, 209, 0.1);
  background: rgba(0, 0, 0, 0.2);
}

.footer-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 16px;
  min-height: 52px;
  font-size: 0.76rem;
  color: var(--text-body);
}

.footer-copy {
  margin: 0;
}

.footer-icp {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--text-body);
  text-decoration: none;
}

.footer-icp:hover {
  color: var(--accent);
}

.back-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 950;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 46px;
  height: 46px;
  padding: 8px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--bg-deep);
  font-family: var(--font-data);
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 255, 135, 0.35);
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
}

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

.back-top:hover {
  background: var(--accent-cyan);
}

.back-top-icon {
  display: block;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 6px solid var(--bg-deep);
  margin-bottom: 1px;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

@media (max-width: 960px) {
  #main-content {
    scroll-margin-top: 64px;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .header-bottom {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 980;
    max-height: 0;
    overflow: hidden;
    background: var(--bg-panel);
    visibility: hidden;
    border-top: none;
    box-shadow: 0 24px 32px rgba(0, 0, 0, 0.35);
    transition: max-height 280ms var(--ease, cubic-bezier(0.23, 1, 0.32, 1)), visibility 280ms, border-color 280ms;
  }

  .header-bottom[data-open] {
    max-height: 520px;
    overflow-y: auto;
    visibility: visible;
    border-top: 1px solid rgba(100, 255, 218, 0.12);
  }

  .header-bottom-stack {
    gap: 0;
  }

  .nav-slogan {
    padding: 12px 4px 8px;
    border-bottom: 1px solid rgba(168, 178, 209, 0.1);
  }

  .header-bottom-inner {
    min-height: 0;
  }

  .main-nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .main-nav a {
    padding: 13px 4px;
    border-bottom: 1px solid rgba(168, 178, 209, 0.07);
  }

  .main-nav a:last-child {
    border-bottom: none;
  }

  .main-nav a:hover {
    background: rgba(0, 255, 135, 0.04);
  }

  .main-nav a[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
    width: 3px;
    height: 55%;
    clip-path: none;
    border-radius: 0 3px 3px 0;
  }

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

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

@media (max-width: 620px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .back-top {
    right: 14px;
    bottom: 16px;
  }
}

@media (max-width: 420px) {
  .chip-btn {
    padding: 5px 8px;
    font-size: 0.7rem;
  }

  .brand-number {
    font-size: 1.4rem;
  }

  .brand-text {
    font-size: 0.8rem;
    letter-spacing: 0.04em;
  }

  .brand-slash {
    font-size: 1.2rem;
  }
}

@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;
  }
}