:root {
  --c-blue: #0A5CFE;
  --c-blue-light: #3A82FF;
  --c-deep: #0D1B2A;
  --c-deep-2: #081120;
  --c-orange: #FF7A00;
  --c-green: #39FF14;
  --c-paper: #F4F0E8;
  --c-gray: #E6E8EC;
  --c-mid: #8D99AE;
  --c-white: #FFFFFF;
  --c-gold: #FFC700;
  --gradient-sea: linear-gradient(135deg, #00C9FF 0%, #92FE9D 100%);
  --font-head: "Exo 2", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", Consolas, monospace;
  --container-w: 1240px;
  --container-pad: 24px;
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --header-offset: 108px;
  --section-space: clamp(60px, 8vw, 100px);
}

@media (max-width: 920px) {
  :root {
    --container-pad: 20px;
    --header-offset: 86px;
  }
}

@media (max-width: 680px) {
  :root {
    --container-pad: 16px;
    --header-offset: 82px;
  }
}

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

html {
  scroll-padding-top: var(--header-offset);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background:
    radial-gradient(ellipse 55% 35% at 85% 0%, rgba(10, 92, 254, 0.16), transparent 65%),
    radial-gradient(ellipse 35% 25% at 8% 12%, rgba(57, 255, 20, 0.05), transparent 55%),
    var(--c-deep);
  background-attachment: fixed;
  color: var(--c-white);
  line-height: 1.65;
  min-height: 100vh;
  padding-top: var(--header-offset);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  line-height: 1.15;
  color: var(--c-white);
  font-weight: 800;
}

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

a:hover {
  color: var(--c-blue-light);
}

ul, ol {
  list-style: none;
}

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

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

:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: -64px;
  left: 24px;
  z-index: 2000;
  background: var(--c-orange);
  color: var(--c-deep);
  font-weight: 700;
  font-size: 14px;
  padding: 12px 24px;
  border-radius: 0 0 14px 14px;
  transition: top 0.2s ease;
  pointer-events: auto;
}

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

.container {
  width: min(calc(100% - var(--container-pad) - var(--container-pad)), var(--container-w));
  margin-inline: auto;
}

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

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

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

@media (max-width: 920px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: 999px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}

.btn--primary {
  background: var(--c-blue);
  color: var(--c-white);
  box-shadow: 0 6px 22px rgba(10, 92, 254, 0.38);
}

.btn--primary:hover {
  background: var(--c-blue-light);
  color: var(--c-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(10, 92, 254, 0.5);
}

.btn--orange {
  background: var(--c-orange);
  color: var(--c-deep);
}

.btn--orange:hover {
  color: var(--c-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 122, 0, 0.35);
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.24);
  color: var(--c-white);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--c-blue-light);
  color: var(--c-blue-light);
}

.section {
  padding: var(--section-space) 0;
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--c-blue-light);
}

.section__label::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--c-blue);
}

.section__title {
  font-size: clamp(30px, 4.5vw, 52px);
  margin-top: 10px;
  letter-spacing: -0.02em;
}

.section__desc {
  max-width: 60ch;
  margin-top: 14px;
  color: var(--c-mid);
  font-size: 16px;
  line-height: 1.7;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--c-mid);
  padding: 18px 0;
}

.breadcrumb a {
  color: var(--c-gray);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--c-blue-light);
}

.breadcrumb__sep {
  opacity: 0.5;
  color: var(--c-mid);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 6px;
  background: rgba(10, 92, 254, 0.12);
  border: 1px solid rgba(10, 92, 254, 0.26);
  color: var(--c-blue-light);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: background var(--transition), color var(--transition);
}

.tag:hover {
  background: rgba(10, 92, 254, 0.22);
  color: var(--c-white);
}

.img-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(0, 201, 255, 0.08), rgba(146, 254, 157, 0.06)),
    rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(230, 232, 236, 0.12);
  display: grid;
  place-items: center;
  min-height: 180px;
}

.img-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.img-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.img-frame--1x1 {
  aspect-ratio: 1 / 1;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  isolation: isolate;
  padding: 16px 24px;
  pointer-events: none;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 30%, rgba(10, 92, 254, 0.32), transparent 45%),
    radial-gradient(circle at 78% 20%, rgba(57, 255, 20, 0.14), transparent 35%),
    linear-gradient(135deg, rgba(0, 201, 255, 0.14), rgba(146, 254, 157, 0.05));
  filter: blur(14px);
  z-index: -1;
  opacity: 0.7;
}

.site-header__inner {
  position: relative;
  z-index: 1;
  max-width: min(calc(100% - var(--container-pad) - var(--container-pad)), var(--container-w));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 18px;
  background: rgba(13, 27, 42, 0.74);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid rgba(230, 232, 236, 0.14);
  border-radius: 999px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.42);
  pointer-events: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-white);
  flex-shrink: 0;
}

.brand:hover {
  color: var(--c-white);
}

.brand__mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--gradient-sea);
  color: var(--c-deep);
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 900;
  box-shadow: 0 0 0 2px rgba(0, 201, 255, 0.2), 0 4px 18px rgba(0, 201, 255, 0.35);
}

.brand__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

.brand__tagline {
  font-size: 10px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--c-mid);
  margin-top: 2px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  display: inline-block;
}

.site-nav__link {
  display: block;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-gray);
  letter-spacing: 0.04em;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}

.site-nav__link:hover {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.08);
}

.site-nav__link[aria-current="page"] {
  background: var(--c-blue);
  color: var(--c-white);
  box-shadow: 0 4px 18px rgba(10, 92, 254, 0.4);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(230, 232, 236, 0.16);
  background: rgba(255, 255, 255, 0.04);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  color: var(--c-white);
  transition: background var(--transition), border-color var(--transition);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(10, 92, 254, 0.5);
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease;
}

.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);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-sea);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 1600;
  pointer-events: none;
}

@media (max-width: 920px) {
  .site-header {
    padding: 12px 16px;
  }

  .site-header__inner {
    padding: 8px 12px;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    width: auto;
    min-width: 280px;
    background: rgba(13, 27, 42, 0.94);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(230, 232, 236, 0.14);
    border-radius: 20px;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
    padding: 12px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.98);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .site-nav__link {
    padding: 13px 20px;
    text-align: left;
    border-radius: 12px;
    font-size: 15px;
  }
}

.site-footer {
  position: relative;
  margin-top: calc(var(--section-space) + 40px);
  background: var(--c-deep-2);
  border-top: 1px solid rgba(139, 158, 177, 0.16);
  color: var(--c-gray);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-sea);
  opacity: 0.5;
}

.site-footer__inner {
  width: min(calc(100% - var(--container-pad) - var(--container-pad)), var(--container-w));
  margin-inline: auto;
  padding: 64px 0 44px;
  display: grid;
  grid-template-columns: 1.6fr 1.2fr 1.4fr;
  gap: 56px 40px;
}

.site-footer__brand,
.site-footer__category,
.site-footer__contact {
  min-width: 0;
}

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

.site-footer__logo {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: var(--gradient-sea);
  display: grid;
  place-items: center;
  color: var(--c-deep);
  font-weight: 900;
  font-size: 20px;
  box-shadow: 0 4px 16px rgba(0, 201, 255, 0.3);
}

.site-footer__brand-name {
  display: block;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: 0.1em;
}

.site-footer__slogan {
  margin-top: 18px;
  font-size: 15px;
  color: var(--c-white);
  font-weight: 600;
}

.site-footer__trust {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mid);
  max-width: 34ch;
}

.site-footer__heading {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-mid);
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 3px solid var(--c-blue);
}

.site-footer__cats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-footer__cat {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--c-gray);
  transition: color var(--transition), transform var(--transition);
}

.site-footer__cat:hover {
  color: var(--c-white);
  transform: translateX(4px);
}

.site-footer__cat-icon {
  width: 8px;
  height: 8px;
  transform: rotate(45deg);
  border-radius: 2px;
  background: linear-gradient(135deg, var(--c-blue), var(--c-green));
  flex: 0 0 auto;
}

.site-footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--c-gray);
}

.site-footer__contact-item {
  line-height: 1.6;
}

.footer__mode {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(10, 92, 254, 0.34);
  background: rgba(10, 92, 254, 0.12);
  color: var(--c-gray);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.footer__mode::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.8);
}

.footer__mode:hover {
  color: var(--c-white);
  border-color: var(--c-blue-light);
}

.footer__mode[aria-pressed="true"] {
  background: rgba(57, 255, 20, 0.1);
  border-color: rgba(57, 255, 20, 0.4);
  color: var(--c-green);
}

.site-footer[data-score-mode] .site-footer__cats {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px;
}

.site-footer[data-score-mode] .site-footer__cat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(139, 158, 177, 0.14);
  border-radius: 999px;
  font-size: 13px;
}

.site-footer[data-score-mode] .site-footer__cat::after {
  content: attr(data-rank);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-green);
}

.site-footer[data-score-mode] .site-footer__cat-icon {
  width: 6px;
  height: 6px;
  background: var(--c-orange);
}

.site-footer__bottom {
  border-top: 1px solid rgba(139, 158, 177, 0.12);
  width: min(calc(100% - var(--container-pad) - var(--container-pad)), var(--container-w));
  margin-inline: auto;
  padding: 22px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
}

.site-footer__copyright {
  font-size: 13px;
  color: var(--c-mid);
  margin-right: auto;
}

.site-footer__legal {
  display: flex;
  gap: 18px;
}

.site-footer__legal a {
  font-size: 13px;
  color: var(--c-mid);
  transition: color var(--transition);
}

.site-footer__legal a:hover {
  color: var(--c-blue-light);
}

.site-footer__icp {
  font-size: 13px;
  color: var(--c-mid);
}

@media (max-width: 1100px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 680px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    padding-top: 48px;
  }

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

  .site-footer__legal {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.02s !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }
}