:root {
  --primary-bg: #0A0E1F;
  --secondary-bg: #111526;
  --card-bg: #161B2E;
  --accent: #00E88F;
  --accent-alt: #00A3FF;
  --text-primary: #E6F0FF;
  --text-secondary: #93A4C0;
  --border-glow: #00E88F33;
  --warning: #FFC857;
  --danger: #FF5C5C;
  --header-h: 72px;
  --content-max: 1320px;
  --content-pad: clamp(1rem, 4vw, 2rem);
  --radius: 16px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--primary-bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

button {
  font: inherit;
  cursor: pointer;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

::selection {
  background: rgba(0, 232, 143, 0.25);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

#main-content {
  display: block;
  padding-top: calc(var(--header-h) + 1rem);
  min-height: 70vh;
}

.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 999;
  background: var(--accent);
  color: #07141d;
  padding: 0.75rem 1.25rem;
  border-radius: 6px;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.25s var(--ease);
}

.skip-link:focus-visible {
  top: 1rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(10, 14, 31, 0.92);
  border-bottom: 1px solid rgba(0, 232, 143, 0.22);
}

.site-header::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3.5rem;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0, 232, 143, 0.8);
}

.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  height: 100%;
  width: 2.5rem;
  border-left: 1px solid rgba(0, 163, 255, 0.08);
  background: linear-gradient(180deg, transparent 0%, rgba(0, 163, 255, 0.12) 100%);
  pointer-events: none;
}

.site-header__inner {
  height: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.site-brand__mark {
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  border: 1px solid rgba(0, 232, 143, 0.7);
  border-radius: 6px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  background: rgba(0, 232, 143, 0.08);
  box-shadow: 0 0 14px rgba(0, 232, 143, 0.18);
}

.site-brand__text {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  gap: clamp(1rem, 2.4vw, 2.4rem);
}

.site-nav__link {
  display: inline-block;
  padding: 0.4em 0 0.2em;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.87rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  border-bottom: 1px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}

.site-nav__link:hover {
  color: var(--text-primary);
  border-color: rgba(0, 232, 143, 0.5);
}

.site-nav__link[aria-current="page"] {
  color: var(--accent);
  border-color: var(--accent);
  text-shadow: 0 0 10px rgba(0, 232, 143, 0.4);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-shrink: 0;
}

.site-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem;
  border-radius: 40px;
  border: 1px solid rgba(0, 232, 143, 0.5);
  background: rgba(0, 232, 143, 0.05);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: background 0.3s, box-shadow 0.3s, transform 0.3s;
}

.site-cta:hover {
  background: var(--accent);
  color: #04141d;
  box-shadow: 0 0 18px rgba(0, 232, 143, 0.45);
  transform: translateY(-1px);
}

.site-cta__icon {
  display: grid;
  place-items: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: var(--accent);
  color: #04141d;
  font-weight: 900;
  font-size: 0.7rem;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.nav-toggle__bar {
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) 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(-6px) rotate(-45deg);
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: #060a17;
  border-top: 1px solid rgba(0, 232, 143, 0.2);
  margin-top: 4rem;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent 40%);
  z-index: 2;
}

.site-footer__glow {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 25% 0%, rgba(0, 232, 143, 0.14), transparent 45%),
    radial-gradient(circle at 80% 100%, rgba(0, 163, 255, 0.1), transparent 50%);
  opacity: 0.6;
}

.site-footer__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.4fr 1fr minmax(10rem, 0.6fr);
  gap: 3rem;
  padding-block: clamp(2.5rem, 6vw, 5rem) 2rem;
}

.site-footer__brand {
  max-width: 44rem;
}

.site-footer__logo {
  display: inline-block;
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  text-decoration: none;
}

.site-footer__logo::after {
  content: " °";
  color: var(--accent);
}

.site-footer__about {
  color: var(--text-secondary);
  max-width: 42ch;
  margin-top: 1rem;
  line-height: 1.7;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: 1.5rem;
}

.site-footer__legal a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-footer__legal a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.site-footer__contact {
  padding-top: 0.2rem;
}

.site-footer__heading {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.site-footer__meta {
  color: var(--text-secondary);
  font-size: 0.88rem;
  display: grid;
  gap: 0.7rem;
}

.site-footer__meta li {
  position: relative;
  padding-left: 1.6rem;
}

.site-footer__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  border-radius: 50%;
}

.site-footer__stamp {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-end;
  color: var(--text-primary);
  opacity: 0.05;
  font-size: clamp(4rem, 8vw, 7rem);
  line-height: 0.75;
  font-weight: 900;
  letter-spacing: -0.05em;
  white-space: nowrap;
  transform: rotate(-8deg);
  transform-origin: right bottom;
  user-select: none;
}

.site-footer__stamp span {
  display: block;
}

.site-footer__bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-block: 0.9rem;
}

.site-footer__bottom .container {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--text-secondary);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.site-footer__bottom span:last-child {
  color: rgba(147, 164, 192, 0.7);
}

.troubleshoot {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  z-index: 200;
}

.troubleshoot[hidden] {
  display: none;
}

.troubleshoot__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 7, 16, 0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.troubleshoot__panel {
  position: relative;
  z-index: 1;
  background: var(--card-bg);
  border: 1px solid rgba(0, 232, 143, 0.3);
  border-radius: 20px;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  max-width: 28rem;
  width: 100%;
  box-shadow: 0 0 50px rgba(0, 232, 143, 0.12), 0 24px 60px rgba(0, 0, 0, 0.5);
}

.troubleshoot__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.troubleshoot__eyebrow {
  margin: 0 0 0.25rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.troubleshoot__header h2 {
  margin: 0;
  font-size: 1.4rem;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.troubleshoot__close {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.4rem;
  line-height: 1;
  flex-shrink: 0;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.troubleshoot__close:hover {
  background: rgba(0, 232, 143, 0.1);
  color: var(--accent);
  border-color: rgba(0, 232, 143, 0.4);
}

.troubleshoot__list {
  display: grid;
  gap: 0.6rem;
}

.troubleshoot__list a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.85rem;
  line-height: 1.4;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.troubleshoot__list a:hover {
  background: rgba(0, 232, 143, 0.08);
  border-color: rgba(0, 232, 143, 0.35);
  color: var(--accent);
}

.troubleshoot__list a::before {
  content: "→";
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

.troubleshoot__note {
  margin-top: 1.2rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.float-troubleshoot {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #07141d;
  font-size: 1.3rem;
  font-weight: 900;
  z-index: 90;
  display: grid;
  place-items: center;
  box-shadow: 0 0 22px rgba(0, 232, 143, 0.35);
  transition: transform 0.3s, box-shadow 0.3s;
}

.float-troubleshoot:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(0, 232, 143, 0.55);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  box-shadow: 0 0 10px rgba(0, 232, 143, 0.5);
  z-index: 110;
  pointer-events: none;
}

.section {
  padding-block: clamp(3rem, 8vw, 7rem);
}

.section--tight {
  padding-block: clamp(2rem, 5vw, 4rem);
}

.section__index {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent);
}

.section__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  font-weight: 900;
}

.section__desc {
  color: var(--text-secondary);
  max-width: 56ch;
  margin: 0 0 2rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0 0 2rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(147, 164, 192, 0.4);
}

.breadcrumb__link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.4rem;
  border: 1px solid transparent;
  border-radius: 40px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
}

.btn--primary {
  background: var(--accent);
  color: #07141d;
  box-shadow: 0 4px 20px rgba(0, 232, 143, 0.2);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 232, 143, 0.35);
}

.btn--ghost {
  border-color: rgba(0, 232, 143, 0.35);
  color: var(--accent);
}

.btn--ghost:hover {
  background: rgba(0, 232, 143, 0.1);
}

.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--secondary-bg);
  border: 1px solid rgba(0, 232, 143, 0.18);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.image-frame::before {
  content: "";
  display: block;
  padding-bottom: 56.25%;
}

.image-frame--portrait::before {
  padding-bottom: 125%;
}

.image-frame > img,
.image-frame > picture img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.05) saturate(1.1);
  transition: transform 0.6s var(--ease);
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 232, 143, 0.14), transparent 35%);
  mix-blend-mode: screen;
  pointer-events: none;
}

.image-frame:hover img {
  transform: scale(1.03);
}

.image-frame__caption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  z-index: 1;
  background: rgba(10, 14, 31, 0.72);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-primary);
  border: 1px solid rgba(0, 232, 143, 0.3);
}

@media (min-width: 901px) {
  .site-header {
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 64px;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(24rem, 100%);
    margin-left: 0;
    background: rgba(7, 11, 26, 0.98);
    border-left: 1px solid var(--border-glow);
    padding: 2rem;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.4s var(--ease), visibility 0.4s;
    overflow-y: auto;
    z-index: 101;
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 1.25rem;
  }

  .site-nav__link {
    font-size: 1.15rem;
    letter-spacing: 0.12em;
    color: var(--text-primary);
  }

  .site-nav__link[aria-current="page"] {
    color: var(--accent);
  }

  .nav-toggle {
    display: flex;
  }

  .site-cta {
    padding: 0.5rem 0.75rem;
  }
}

@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .site-footer__stamp {
    display: none;
  }

  .float-troubleshoot {
    right: 1rem;
    bottom: 1rem;
  }
}

@media (min-width: 901px) and (max-width: 1100px) {
  .site-footer__grid {
    grid-template-columns: 1.2fr 1fr;
  }

  .site-footer__stamp {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}