:root {
  --ink: #0a1f3c;
  --cream: #f5efe0;
  --brown: #2b1d14;
  --orange: #ff4d2e;
  --cyan: #00e5ff;
  --bluegray: #c4d1e0;
  --creamwhite: #fff8ec;
  --navyline: #1a2d4a;
  --gradblue: #0d2a4d;
  --font-display: Impact, "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --font-data: "Courier New", Consolas, "Roboto Mono", monospace;
  --radius-cut: 8px;
  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, .32);
  --container-w: 1280px;
  --gutter: clamp(1rem, 4vw, 3rem);
}

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

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

body {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.1vw, 1.125rem);
  line-height: 1.7;
  background: var(--ink);
  color: var(--cream);
  min-height: 100vh;
  overflow-x: hidden;
}

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

ul,
ol {
  list-style: none;
}

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

button {
  font: inherit;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
}

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

::selection {
  background: var(--orange);
  color: var(--creamwhite);
}

@media (min-width: 1280px) {
  body::before,
  body::after {
    content: "";
    position: fixed;
    top: 0;
    bottom: 0;
    width: 6px;
    z-index: 1200;
    pointer-events: none;
  }

  body::before {
    left: 0;
    background: var(--navyline);
    border-right: 2px solid var(--orange);
  }

  body::after {
    right: 0;
    background: var(--navyline);
    border-left: 2px solid var(--cyan);
  }
}

.container {
  width: min(100% - 2rem, var(--container-w));
  margin-inline: auto;
}

.section {
  padding-block: clamp(3rem, 8vw, 6.5rem);
}

.section--night {
  background: var(--ink);
  color: var(--cream);
}

.section--cream {
  background: var(--cream);
  color: var(--brown);
}

.section--plain {
  background: transparent;
  color: var(--cream);
}

.grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
}

.h-scroll {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding-bottom: 0.75rem;
  -webkit-overflow-scrolling: touch;
}

.h-scroll > * {
  flex-shrink: 0;
  scroll-snap-align: start;
}

.divider {
  height: 2px;
  width: min(280px, 36vw);
  background: var(--orange);
  border: 0;
  margin-block: 1.5rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 100%, 14px 100%);
}

.prose {
  max-width: 68ch;
}

.prose > * + * {
  margin-top: 1.15em;
}

.prose h1,
.prose h2,
.prose h3 {
  font-family: var(--font-display);
  line-height: 1.15;
  color: inherit;
}

.prose a {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.prose strong {
  color: var(--orange);
}

.lead {
  font-size: clamp(1.1rem, 2vw, 1.375rem);
  line-height: 1.65;
  max-width: 34em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
  background: rgba(255, 77, 46, 0.08);
  padding: 0.35rem 0.75rem;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.eyebrow--cyan {
  color: var(--cyan);
  background: rgba(0, 229, 255, 0.08);
}

.display-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--creamwhite);
  text-shadow: 4px 4px 0 var(--navyline);
  font-weight: 900;
}

.display-title em {
  font-style: normal;
  color: var(--orange);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7em 1em;
  font-family: var(--font-data);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--creamwhite);
  background: var(--orange);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  position: relative;
  isolation: isolate;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 20%, rgba(255, 255, 255, 0.18) 50%, transparent 80%);
  background-size: 200% 100%;
  background-position: 120% 0;
  transition: background-position 0.35s ease;
  z-index: 1;
  pointer-events: none;
}

.btn:hover::before {
  background-position: -20% 0;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.35);
}

.btn:active {
  transform: translateY(0);
}

.btn > * {
  position: relative;
  z-index: 2;
}

.btn-primary {
  background: var(--orange);
  color: var(--creamwhite);
}

.btn-ghost {
  background: rgba(0, 229, 255, 0.07);
  color: var(--cyan);
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.btn-ghost:hover {
  background: rgba(0, 229, 255, 0.16);
  box-shadow: inset 0 0 0 2px var(--cyan), 0 10px 22px rgba(0, 229, 255, 0.2);
}

.btn-arrow {
  font-size: 1.1em;
}

.btn-code {
  color: rgba(0, 229, 255, 0.7);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--bluegray);
  padding-block: 0.75rem;
}

.breadcrumbs::before {
  content: "//";
  color: var(--orange);
  font-weight: 700;
}

.breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.breadcrumbs a:hover {
  border-bottom-color: var(--cyan);
}

.breadcrumbs span[aria-current="page"] {
  color: var(--bluegray);
  font-weight: 700;
}

.tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3em 0.7em;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

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

.tag--cyan {
  background: rgba(0, 229, 255, 0.14);
  color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.media {
  position: relative;
  overflow: hidden;
  display: block;
  background: var(--navyline);
  color: var(--bluegray);
}

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

.media img,
.media video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 36px 36px;
  border-color: transparent transparent var(--orange) transparent;
  pointer-events: none;
}

.media--ultrawide::before {
  padding-bottom: 42%;
}

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

.media--square::before {
  padding-bottom: 100%;
}

.media--clean::after {
  display: none;
}

.disclosure {
  border-bottom: 2px solid var(--navyline);
}

.disclosure summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 0.25rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--brown);
  transition: color 0.2s ease;
}

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

.disclosure summary::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 1.2rem;
  color: var(--orange);
  border: 2px solid var(--orange);
  width: 1.6em;
  height: 1.6em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.disclosure[open] summary {
  color: var(--orange);
}

.disclosure[open] summary::after {
  content: "−";
  background: var(--orange);
  color: var(--creamwhite);
  transform: rotate(180deg);
}

.disclosure .disclosure__body {
  padding: 0.25rem 0.25rem 1.25rem;
  color: var(--brown);
  max-width: 62ch;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  background: var(--orange);
  color: var(--creamwhite);
  padding: 0.7rem 1.2rem;
  font-family: var(--font-data);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
  transform: translateY(-300%);
  transition: transform 0.25s ease;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

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

.site-header {
  position: relative;
  z-index: 1100;
  background: var(--ink);
  border-top: 6px solid var(--orange);
  border-bottom: 4px solid var(--navyline);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.3);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0%;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
  z-index: 2100;
  pointer-events: none;
  transition: width 0.1s linear;
  will-change: width;
}

.header-topline {
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 clamp(1rem, 4vw, 3rem);
  background: linear-gradient(90deg, var(--orange), var(--cyan) 45%, var(--cyan) 55%, var(--orange));
  background-size: 220% 100%;
  animation: topline-sweep 7s ease-in-out infinite alternate;
  border-bottom: 2px solid var(--navyline);
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  overflow: hidden;
}

@keyframes topline-sweep {
  0%   { background-position: 0% 0; }
  100% { background-position: 100% 0; }
}

.topline-live {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.topline-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 0 rgba(10, 31, 60, 0.6);
  animation: topline-pulse 1.8s ease-out infinite;
}

@keyframes topline-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(10, 31, 60, 0.55); }
  70%  { box-shadow: 0 0 0 7px rgba(10, 31, 60, 0); }
  100% { box-shadow: 0 0 0 0 rgba(10, 31, 60, 0); }
}

.topline-date {
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.topline-date b {
  color: var(--ink);
  background: rgba(10, 31, 60, 0.12);
  padding: 0.1em 0.5em;
  letter-spacing: 0.1em;
}

.header-main {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.6vw, 2.2rem);
  padding-block: 0.9rem 1rem;
  position: relative;
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.7rem;
  height: 2.7rem;
  background: var(--creamwhite);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  border-bottom: 3px solid var(--orange);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1;
  color: var(--creamwhite);
  transform: skewX(-5deg);
  white-space: nowrap;
}

.brand-name strong {
  color: var(--orange);
  font-weight: 900;
}

.brand-name i {
  font-style: normal;
  color: var(--cyan);
}

.brand--footer .brand-mark {
  width: 2.4rem;
  height: 2.4rem;
  font-size: 1rem;
}

.brand--footer .brand-name {
  font-size: 1.3rem;
}

.site-nav {
  position: static;
  display: block;
  flex: 1;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: nowrap;
}

.nav-item {
  flex-shrink: 0;
}

.nav-link {
  display: block;
  padding: 0.45em 0.75em;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  color: var(--bluegray);
  white-space: nowrap;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  background: transparent;
  border: 1px solid transparent;
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-link:hover {
  color: var(--creamwhite);
  background: rgba(0, 229, 255, 0.12);
  border-color: rgba(0, 229, 255, 0.35);
  transform: translateY(-1px);
}

.nav-link[aria-current="page"] {
  background: var(--orange);
  color: var(--creamwhite);
  border-color: var(--orange);
  box-shadow: 0 4px 14px rgba(255, 77, 46, 0.4);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-left: auto;
  flex-shrink: 0;
}

.header-actions .btn {
  font-size: 0.72rem;
  padding: 0.6em 0.85em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 2px solid var(--cyan);
  background: rgba(0, 229, 255, 0.06);
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-toggle:hover {
  background: var(--cyan);
  color: var(--ink);
}

.nav-toggle-icon {
  position: relative;
  width: 18px;
  height: 12px;
  display: inline-block;
}

.nav-toggle-icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transform-origin: 50% 50%;
  transition: transform 0.25s ease, opacity 0.25s ease, top 0.25s ease;
}

.nav-toggle-icon span:nth-child(1) { top: 0; }
.nav-toggle-icon span:nth-child(2) { top: 5px; }
.nav-toggle-icon span:nth-child(3) { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) {
  top: 5px;
  transform: rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3) {
  top: 5px;
  transform: rotate(-45deg);
}

.site-footer {
  background: var(--navyline);
  color: var(--bluegray);
  border-top: 6px solid var(--orange);
  position: relative;
  z-index: 10;
}

.footer-wave {
  height: 16px;
  background: repeating-linear-gradient(
    115deg,
    var(--orange) 0 8px,
    transparent 8px 16px,
    var(--cyan) 16px 24px,
    transparent 24px 32px
  );
  animation: wave-slide 0.9s linear infinite;
}

@keyframes wave-slide {
  from { background-position: 0 0; }
  to   { background-position: 32px 0; }
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.8fr) minmax(0, 1.1fr) minmax(0, 0.7fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.footer-brand {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.footer-trust {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--bluegray);
  max-width: 34ch;
}

.footer-heading {
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  padding-bottom: 0.6rem;
  border-bottom: 2px solid rgba(0, 229, 255, 0.35);
  margin-bottom: 1rem;
}

.footer-links {
  display: grid;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, padding-left 0.2s ease;
}

.footer-links a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
  padding-left: 0.35rem;
}

.footer-bottomline {
  border-top: 2px solid rgba(0, 229, 255, 0.3);
  background: var(--ink);
}

.footer-bottomline__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  padding-block: 0.85rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.footer-copyright {
  color: var(--bluegray);
}

@media (max-width: 1024px) {
  .nav-toggle {
    display: inline-flex;
  }

  .header-actions {
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 990;
    background: var(--ink);
    border-top: 2px solid var(--cyan);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, border-width 0.2s ease;
  }

  .site-nav[data-open] {
    max-height: 120px;
    border-bottom: 3px solid var(--orange);
    box-shadow: 0 22px 40px rgba(0, 0, 0, 0.45);
  }

  .nav-list {
    display: flex;
    flex-direction: row;
    gap: 0.3rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0.6rem clamp(1rem, 4vw, 3rem);
    scrollbar-width: thin;
  }

  .nav-link {
    flex-shrink: 0;
    padding: 0.55em 0.95em;
  }

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

@media (max-width: 720px) {
  .header-topline {
    height: 34px;
    font-size: 0.66rem;
  }

  .topline-date {
    display: none;
  }

  .header-main {
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  .brand {
    margin-right: auto;
  }

  .brand-mark {
    width: 2.2rem;
    height: 2.2rem;
    font-size: 1rem;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .header-actions {
    order: 3;
    width: 100%;
    justify-content: flex-end;
    gap: 0.5rem;
  }

  .header-actions .btn {
    flex: 1;
    justify-content: center;
  }

  .nav-toggle {
    margin-left: 0;
  }

  .site-nav[data-open] {
    max-height: 110px;
  }

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

  .footer-brand {
    border-bottom: 2px solid rgba(0, 229, 255, 0.2);
    padding-bottom: 1.2rem;
  }

  .footer-bottomline__inner {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }

  .scroll-progress {
    height: 3px;
  }

  .skip-link {
    padding: 0.6rem 1rem;
    font-size: 0.7rem;
  }
}

@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;
    scroll-behavior: auto !important;
  }

  .scroll-progress {
    transition: none;
  }

  .footer-wave,
  .header-topline,
  .topline-dot {
    animation: none !important;
  }
}