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

:root {
  --color-primary: #FF6B00;
  --color-secondary: #00B8FF;
  --color-bg: #0A0E17;
  --color-accent: #39FF14;
  --color-warning: #E4604C;
  --color-text: #F5F2EB;
  --color-muted: #B8C0CC;
  --color-line: #7C8798;
  --color-white: #FFFFFF;
  --font-headline: 'Rajdhani', 'Oswald', '思源黑体 Heavy', sans-serif;
  --font-body: 'Inter', '思源黑体 Regular', sans-serif;
}

html {
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

ul,
ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}

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

button {
  font-family: inherit;
  font-size: 100%;
  border: none;
  background: none;
  cursor: pointer;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-style: italic;
  line-height: 1.15;
  color: var(--color-white);
  margin-bottom: 0.5em;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

h4 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
}

small {
  font-size: 0.85em;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 12px;
  z-index: 300;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 800;
  font-size: 0.9rem;
  padding: 12px 18px;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}

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

.text-secondary {
  color: var(--color-secondary);
}

.text-muted {
  color: var(--color-muted);
}

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

.text-center {
  text-align: center;
}

.section {
  padding-block: 48px;
}

.section--tight {
  padding-block: 28px;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.section-heading::before {
  content: "";
  display: block;
  width: 8px;
  height: 28px;
  background: var(--color-primary);
  transform: skew(-8deg);
  flex-shrink: 0;
}

.section-heading__title {
  font-size: 2rem;
  font-weight: 900;
  font-style: italic;
  line-height: 1.15;
  color: var(--color-white);
  margin: 0;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1rem;
  font-style: normal;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transform: skew(-6deg);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.btn__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transform: skew(6deg);
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-secondary);
  color: var(--color-bg);
  box-shadow: 4px 4px 0 rgba(0, 184, 255, 0.35);
  transform: skew(-6deg) translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border: 2px solid var(--color-secondary);
  color: var(--color-secondary);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-secondary);
  color: var(--color-bg);
}

.btn--large {
  padding: 18px 34px;
  font-size: 1.1rem;
}

.card {
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid rgba(124, 135, 152, 0.3);
  border-radius: 0;
  padding: 24px;
  height: 100%;
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover,
.card:focus-within {
  border-color: var(--color-secondary);
  box-shadow: 0 0 16px rgba(0, 184, 255, 0.15), 4px 4px 0 rgba(255, 107, 0, 0.25);
  transform: translateY(-2px);
}

.card--accent {
  border-color: rgba(255, 107, 0, 0.4);
  border-left-width: 4px;
}

.path-list {
  display: grid;
  gap: 16px;
}

.path-step {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  padding: 20px;
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid rgba(124, 135, 152, 0.3);
  border-left: 4px solid var(--color-secondary);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.path-step:hover,
.path-step:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 14px rgba(255, 107, 0, 0.12);
  transform: translateY(-2px);
}

.path-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-headline);
  font-weight: 900;
  font-style: italic;
  font-size: 1.1rem;
  line-height: 1;
  transform: skew(-8deg);
}

.path-step__title {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-secondary);
  margin-bottom: 4px;
  line-height: 1.2;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text);
  border: 1px solid var(--color-line);
  background: rgba(124, 135, 152, 0.1);
}

.tag--primary {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(255, 107, 0, 0.08);
}

.tag--secondary {
  color: var(--color-secondary);
  border-color: var(--color-secondary);
  background: rgba(0, 184, 255, 0.08);
}

.tag--accent {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(57, 255, 20, 0.08);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 14px 0;
  font-size: 0.82rem;
  color: var(--color-muted);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb__link {
  color: var(--color-secondary);
  text-decoration: none;
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  text-decoration: underline;
}

.breadcrumb__sep {
  color: var(--color-line);
}

.breadcrumb__current {
  color: var(--color-text);
}

.page-hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid rgba(124, 135, 152, 0.25);
  background: linear-gradient(180deg, rgba(255, 107, 0, 0.06) 0%, transparent 100%);
}

.page-hero__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  font-style: italic;
  line-height: 1.1;
  color: var(--color-white);
  margin: 0 0 8px;
}

.page-hero__lead {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 680px;
}

.prose {
  max-width: 720px;
  margin-inline: auto;
  font-size: 1rem;
}

.prose p {
  color: var(--color-text);
}

.prose h2 {
  margin-top: 1.5em;
}

.prose ul {
  list-style: none;
  padding-left: 0;
}

.prose ul li {
  padding-left: 18px;
  position: relative;
  margin-bottom: 8px;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  transform: rotate(45deg);
}

.image-frame {
  position: relative;
  width: 100%;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 184, 255, 0.15) 0%, transparent 50%),
    linear-gradient(135deg, #111827 0%, #0A0E17 100%);
  border: 1px solid rgba(124, 135, 152, 0.35);
  min-height: 220px;
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124, 135, 152, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 135, 152, 0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.image-frame::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 60px;
  height: 60px;
  background: var(--color-secondary);
  opacity: 0.35;
  transform: rotate(45deg);
  pointer-events: none;
}

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

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

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

.divider {
  height: 1px;
  border: none;
  background: rgba(124, 135, 152, 0.35);
  margin: 32px 0;
}

.site-header {
  position: relative;
  background-color: var(--color-bg);
  border-bottom: 2px solid var(--color-primary);
  z-index: 100;
}

.site-header__topline {
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-primary) 28%,
    var(--color-secondary) 28%,
    var(--color-secondary) 52%,
    var(--color-accent) 52%,
    var(--color-accent) 62%,
    var(--color-warning) 62%,
    var(--color-warning) 100%
  );
}

.site-header__inner {
  max-width: 1200px;
  margin-inline: auto;
  padding: 0 24px;
}

.site-header__masthead {
  position: relative;
  min-height: 92px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px 96px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: inherit;
}

.site-brand:hover .site-brand__name,
.site-brand:focus-visible .site-brand__name {
  color: var(--color-secondary);
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  padding: 8px 10px;
  background: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-headline);
  font-size: 1.6rem;
  font-weight: 900;
  font-style: italic;
  line-height: 1;
  transform: skew(-8deg);
  box-shadow: 4px 4px 0 rgba(0, 184, 255, 0.5);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-brand__name {
  display: block;
  font-family: var(--font-headline);
  font-size: 1.7rem;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.5px;
  line-height: 1;
  color: var(--color-white);
  transition: color 0.2s ease;
}

.site-brand__tagline {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-accent);
  text-transform: uppercase;
  line-height: 1.2;
}

.site-nav {
  border-top: 1px solid rgba(124, 135, 152, 0.4);
  border-bottom: 1px solid rgba(124, 135, 152, 0.4);
  background: rgba(10, 14, 23, 0.6);
}

.site-nav__list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
}

.site-nav__item {
  position: relative;
}

.site-nav__item + .site-nav__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 18px;
  background: rgba(124, 135, 152, 0.3);
}

.site-nav__link {
  position: relative;
  display: block;
  padding: 14px 26px;
  font-family: var(--font-headline);
  font-size: 0.95rem;
  font-weight: 700;
  font-style: normal;
  letter-spacing: 1.5px;
  color: var(--color-text);
  text-transform: uppercase;
  transition: color 0.2s ease, text-shadow 0.2s ease, background-color 0.2s ease;
}

.site-nav__link::after {
  position: absolute;
  left: 26px;
  right: 26px;
  bottom: 0;
  height: 3px;
  background: var(--color-primary);
  content: "";
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-primary);
  text-shadow: 0 0 18px rgba(255, 107, 0, 0.4);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-secondary);
  background: linear-gradient(180deg, transparent 60%, rgba(0, 184, 255, 0.18) 100%);
}

.site-nav__toggle {
  display: none;
}

.site-header__emergency {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(57, 255, 20, 0.08);
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-decoration: none;
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.15);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.site-header__emergency:hover,
.site-header__emergency:focus-visible {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.6);
}

.site-header__emergency-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 50%;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 900;
  line-height: 1;
  animation: emergency-pulse 2s ease-in-out infinite;
}

.site-header__emergency-label {
  display: inline;
  line-height: 1;
}

.site-footer {
  position: relative;
  margin-top: 72px;
  background-color: #070A12;
  border-top: 2px solid var(--color-primary);
}

.site-footer__strip {
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-primary) 30%,
    var(--color-secondary) 30%,
    var(--color-secondary) 64%,
    var(--color-accent) 64%,
    var(--color-accent) 80%,
    var(--color-warning) 80%,
    var(--color-warning) 100%
  );
}

.site-footer__inner {
  max-width: 1200px;
  margin-inline: auto;
  padding: 56px 24px 40px;
}

.site-footer__primary {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 2fr);
  gap: 36px;
}

.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.site-footer__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  padding: 6px 8px;
  background: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-headline);
  font-weight: 900;
  font-style: italic;
  font-size: 1.1rem;
  line-height: 1;
  transform: skew(-6deg);
}

.site-footer__logo-text {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--color-white);
}

.site-footer__about {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 18px;
  max-width: 340px;
}

.site-footer__trust {
  color: var(--color-muted);
  font-size: 0.82rem;
  border-left: 3px solid var(--color-secondary);
  padding-left: 12px;
  margin-bottom: 0;
  max-width: 360px;
  line-height: 1.6;
}

.site-footer__heading {
  font-size: 0.95rem;
  font-weight: 800;
  font-style: normal;
  letter-spacing: 1.2px;
  color: var(--color-secondary);
  text-transform: uppercase;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(0, 184, 255, 0.3);
}

.site-footer__links li + li {
  margin-top: 6px;
}

.site-footer__links a {
  font-size: 0.88rem;
  color: var(--color-muted);
  transition: color 0.2s ease;
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--color-secondary);
}

.site-footer__contact li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 8px;
  line-height: 1.4;
}

.site-footer__contact-label {
  font-family: var(--font-headline);
  font-weight: 800;
  color: var(--color-warning);
  letter-spacing: 0.5px;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid rgba(124, 135, 152, 0.35);
}

.site-footer__copyright {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin: 0;
}

.site-footer__icp {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin: 0;
  letter-spacing: 1px;
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 120;
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  background: rgba(10, 14, 23, 0.95);
  border: 2px solid var(--color-secondary);
  color: var(--color-text);
  box-shadow: 0 0 14px rgba(0, 184, 255, 0.25);
  cursor: pointer;
  padding: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: var(--color-bg);
}

.back-to-top__icon {
  font-family: var(--font-headline);
  font-size: 1.2rem;
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
}

.back-to-top__bar {
  position: absolute;
  left: -2px;
  right: -2px;
  bottom: -2px;
  height: 4px;
  background: var(--color-accent);
  transform-origin: left;
  transform: scaleX(0);
  pointer-events: none;
  transition: transform 0.06s linear;
}

@keyframes emergency-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.4);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(57, 255, 20, 0);
  }
}

@keyframes nav-drop {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1024px) {
  .site-footer__primary {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    padding: 0 16px;
  }

  .site-header__masthead {
    min-height: 76px;
    padding: 18px 76px;
  }

  .site-brand__mark {
    min-width: 42px;
    font-size: 1.3rem;
  }

  .site-brand__name {
    font-size: 1.4rem;
  }

  .site-brand__tagline {
    font-size: 0.65rem;
    letter-spacing: 1px;
  }

  .site-nav__toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: 2px solid var(--color-line);
    color: var(--color-text);
    cursor: pointer;
    z-index: 20;
  }

  .site-nav__toggle-bar {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--color-text);
    transition: transform 0.2s ease, opacity 0.2s ease, background-color 0.2s ease;
  }

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

  .site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(2) {
    opacity: 0;
  }

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

  .site-nav {
    display: none;
    border-top: none;
  }

  .site-nav[data-open="true"] {
    display: block;
    animation: nav-drop 0.18s ease-out;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav__item + .site-nav__item::before {
    display: none;
  }

  .site-nav__link {
    padding: 14px 20px;
    border-bottom: 1px solid rgba(124, 135, 152, 0.2);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-header__emergency {
    right: 16px;
    width: 44px;
    height: 44px;
    padding: 0;
    justify-content: center;
  }

  .site-header__emergency-label {
    display: none;
  }
}

@media (max-width: 600px) {
  .site-footer__primary {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

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

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 48px;
    height: 48px;
  }

  .section {
    padding-block: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}