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

:root {
  --bg-deep: #0B3D2E;
  --bg-darker: #062B20;
  --accent: #FF6B35;
  --accent-deep: #E14D1A;
  --white: #FFFFFF;
  --light: #EBF2EE;
  --green-mid: #2A6B4A;
  --ink: #0B0B0B;
  --muted: #BFCFC7;
  --amber: #F4A221;
  --steel: #2B5D6B;
  --font-head: "Oswald", "Arial Narrow", "Helvetica Neue", "Arial", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --site-max: 1120px;
  --radius: 12px;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.24);
  --transition: 0.2s ease;
  --header-h: 86px;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-deep);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

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

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.15;
  color: var(--white);
}

h1 { font-size: clamp(34px, 6vw, 60px); }
h2 { font-size: clamp(26px, 4vw, 40px); }
h3 { font-size: clamp(20px, 3vw, 26px); }

p {
  margin: 0 0 1em;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 12px);
}

::selection {
  background: var(--accent);
  color: var(--bg-deep);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 1001;
  transform: translateX(-50%) translateY(-140%);
  background: var(--accent);
  color: var(--bg-darker);
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.skip-link:focus-visible {
  transform: translateX(-50%) translateY(0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 1002;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent) 60%, var(--amber));
  pointer-events: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 14px max(16px, env(safe-area-inset-left)) 0;
  pointer-events: none;
}

.header-shell {
  max-width: var(--site-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 10px 12px 10px 20px;
  background: rgba(11, 61, 46, 0.9);
  border: 1px solid rgba(255, 107, 53, 0.22);
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  pointer-events: auto;
  transition: background var(--transition), box-shadow var(--transition), border-radius var(--transition);
}

.site-header.is-scrolled .header-shell {
  background: rgba(7, 42, 32, 0.96);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.34);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  white-space: nowrap;
}

.brand_emblem {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1px;
  background: var(--accent);
  color: var(--bg-darker);
  border-radius: 9px 9px 9px 2px;
  padding: 3px 9px;
  transform: skewX(-6deg);
  box-shadow: 0 4px 10px rgba(255, 107, 53, 0.3);
}

.brand_name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--white);
}

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

.nav_list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav_item {
  margin: 0;
}

.nav_link {
  display: block;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  color: rgba(255, 255, 255, 0.86);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.nav_link:hover {
  color: var(--white);
  background: rgba(255, 107, 53, 0.16);
}

.nav_link[aria-current="page"] {
  color: var(--white);
  background: var(--accent);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.35);
}

.header_quick {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

.header_quick::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transition: background var(--transition);
}

.header_quick:hover {
  background: var(--accent);
  color: var(--bg-darker);
}

.header_quick:hover::before {
  background: var(--bg-darker);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color var(--transition);
}

.nav-toggle:hover {
  border-color: var(--accent);
}

.nav-toggle_box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.nav-toggle_bar {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}

.nav-toggle.is-active .nav-toggle_box .nav-toggle_bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle_box .nav-toggle_bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle_box .nav-toggle_bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-container {
  width: min(var(--site-max), calc(100% - 48px));
  margin-inline: auto;
}

.page-main {
  padding-top: calc(var(--header-h) + 24px);
}

.section {
  padding: 72px 0;
}

.section--tight {
  padding: 48px 0;
}

.section--soft {
  background: rgba(255, 255, 255, 0.04);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.section--alt {
  background: var(--light);
  color: var(--ink);
}

.section--alt :is(h1, h2, h3, h4) {
  color: var(--ink);
}

.section--alt .section-desc {
  color: #56685F;
}

.section-head {
  max-width: 780px;
  margin: 0 0 40px;
  display: grid;
  gap: 10px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
}

.section-tag::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--accent);
  transform: skewX(-30deg);
}

.section-title {
  margin: 0;
}

.section-desc {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.col-12 { grid-column: span 12; }
.col-8 { grid-column: span 8; }
.col-7 { grid-column: span 7; }
.col-6 { grid-column: span 6; }
.col-5 { grid-column: span 5; }
.col-4 { grid-column: span 4; }
.col-3 { grid-column: span 3; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn--primary {
  background: var(--accent);
  color: var(--bg-darker);
  box-shadow: 0 6px 18px rgba(255, 107, 53, 0.32);
}

.btn--primary:hover {
  background: var(--accent-deep);
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.42);
  color: var(--white);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--small {
  padding: 7px 14px;
  font-size: 13px;
}

.section--alt .btn--ghost {
  border-color: rgba(11, 61, 46, 0.4);
  color: var(--ink);
}

.section--alt .btn--ghost:hover {
  border-color: var(--accent-deep);
  color: var(--accent-deep);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--white);
}

.tag--orange {
  border-color: var(--accent);
  color: var(--accent);
}

.tag--amber {
  border-color: var(--amber);
  color: var(--amber);
}

.tag--steel {
  border-color: var(--steel);
  color: #8FC5D8;
}

.section--alt .tag {
  border-color: rgba(11, 61, 46, 0.25);
  color: var(--ink);
}

.section--alt .tag--orange {
  border-color: var(--accent);
  color: var(--accent-deep);
}

.section--alt .tag--amber {
  border-color: var(--amber);
  color: #9C6D00;
}

.section--alt .tag--steel {
  border-color: var(--steel);
  color: var(--steel);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid rgba(255, 107, 53, 0.42);
  border-radius: 999px;
  background: rgba(255, 107, 53, 0.12);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
}

.data-chip strong {
  color: var(--accent);
  font-weight: 700;
}

.section--alt .data-chip {
  background: rgba(11, 61, 46, 0.08);
  border-color: rgba(11, 61, 46, 0.2);
  color: var(--ink);
}

.section--alt .data-chip strong {
  color: var(--accent-deep);
}

.card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: rgba(255, 107, 53, 0.55);
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  background: var(--accent);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover::after {
  opacity: 1;
}

.card--light {
  background: var(--white);
  border-color: rgba(11, 61, 46, 0.1);
  color: var(--ink);
}

.card--light h3 {
  color: var(--ink);
}

.section--alt .card {
  background: var(--white);
  border-color: rgba(11, 61, 46, 0.1);
  color: var(--ink);
}

.section--alt .card h3 {
  color: var(--ink);
}

.section--alt .card .stat_label {
  color: #718078;
}

.card .card_title {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
}

.card .card_meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--muted);
  text-transform: uppercase;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.stat_value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -1px;
  color: var(--accent);
}

.stat--white .stat_value {
  color: var(--white);
}

.stat--amber .stat_value {
  color: var(--amber);
}

.stat_label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
}

.speed-stripes {
  position: relative;
  overflow: hidden;
}

.speed-stripes::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -65deg,
    transparent 0,
    transparent 18px,
    rgba(255, 255, 255, 0.06) 18px,
    rgba(255, 255, 255, 0.06) 19px
  );
  pointer-events: none;
}

.section--alt .speed-stripes::after {
  background: repeating-linear-gradient(
    -65deg,
    transparent 0,
    transparent 18px,
    rgba(11, 61, 46, 0.05) 18px,
    rgba(11, 61, 46, 0.05) 19px
  );
}

.v-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--muted);
  border-left: 2px solid var(--accent);
  padding-left: 6px;
  max-height: 120px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  list-style: none;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}

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

.breadcrumb [aria-hidden="true"] {
  color: rgba(255, 255, 255, 0.3);
}

.prose {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.75;
  color: #DCE8E0;
}

.prose h2 {
  margin-top: 40px;
  margin-bottom: 14px;
  position: relative;
  padding-left: 14px;
}

.prose h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--accent);
  transform: skewX(-12deg);
}

.prose p {
  margin-bottom: 1.2em;
}

.prose ul {
  padding-left: 1.4em;
  margin-bottom: 1.2em;
}

.prose li {
  margin-bottom: 0.4em;
}

.prose code {
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(255, 107, 53, 0.16);
  border-radius: 4px;
}

.prose--light {
  color: #33413A;
}

.prose--light h2 {
  color: var(--ink);
}

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.18) 0%, transparent 42%),
    linear-gradient(160deg, #1B4B3C, #0B2C22);
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 70%, rgba(255, 107, 53, 0.28) 70%, transparent 72%);
  pointer-events: none;
}

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

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--tilt {
  clip-path: polygon(0 0, 100% 0, 100% 76%, 90% 100%, 0 100%);
}

.path {
  position: relative;
  margin: 0;
  padding-left: 28px;
  display: grid;
  gap: 20px;
  list-style: none;
}

.path::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--accent) 0, var(--accent) 6px, transparent 6px, transparent 12px);
  opacity: 0.7;
}

.path_node {
  position: relative;
  padding: 20px 24px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
}

.path_node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.22);
}

.section--alt .path_node {
  background: var(--white);
  border-color: rgba(11, 61, 46, 0.1);
  color: var(--ink);
}

.site-footer {
  background: var(--bg-darker);
  color: var(--muted);
  border-top: 1px solid rgba(255, 107, 53, 0.24);
  margin-top: 80px;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--accent) 20%, var(--accent) 80%, transparent 100%);
}

.footer_main {
  max-width: var(--site-max);
  margin: 0 auto;
  padding: 64px 24px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
}

.footer_brand {
  display: grid;
  gap: 14px;
}

.footer_slogan {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 30px;
  letter-spacing: 2px;
  color: var(--white);
  position: relative;
  padding-left: 18px;
}

.footer_slogan::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--accent);
  transform: skewX(-14deg);
}

.footer_desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #9EB0A7;
}

.footer_title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
}

.footer_linklist,
.contact_list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 14px;
}

.footer_linklist a {
  color: #D8E4DE;
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
}

.footer_linklist a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.contact_list li {
  color: #BFCFC7;
  line-height: 1.6;
}

.footer_bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.16);
}

.footer_bottom_inner {
  max-width: var(--site-max);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 20px;
  font-size: 13px;
}

.copyright,
.footer_icp,
.footer_phone,
.footer_mail,
.footer_policy {
  margin: 0;
  font-size: 13px;
  color: #A9B8B0;
}

.footer_policy {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.footer_policy a {
  color: #D8E4DE;
  text-decoration: none;
  transition: color var(--transition);
}

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

.footer_sep {
  color: rgba(255, 255, 255, 0.2);
}

.footer_trust {
  max-width: var(--site-max);
  margin: 0 auto;
  padding: 14px 24px 26px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(191, 207, 199, 0.72);
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
}

@media (max-width: 860px) {
  .site-header {
    padding: 10px max(12px, env(safe-area-inset-left)) 0;
  }

  .header-shell {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px;
    border-radius: 28px;
  }

  .site-nav {
    display: none;
    order: 4;
    width: 100%;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    padding-top: 10px;
    margin-top: 4px;
  }

  .site-nav[data-open="true"],
  .site-nav.is-open {
    display: block;
  }

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

  .nav_link {
    padding: 10px 14px;
    font-size: 15px;
  }

  .header_quick {
    margin-left: auto;
    font-size: 12px;
    padding: 7px 12px;
  }

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

  .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .col-12,
  .col-8,
  .col-7,
  .col-6,
  .col-5,
  .col-4,
  .col-3 {
    grid-column: span 2;
  }

  .section {
    padding: 48px 0;
  }

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

  .footer_main {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 48px 20px 32px;
  }

  .footer_brand {
    grid-column: span 2;
  }
}

@media (max-width: 560px) {
  .brand_name {
    font-size: 16px;
  }

  .brand_emblem {
    font-size: 12px;
    padding: 2px 7px;
  }

  .site-container {
    width: min(100% - 32px, var(--site-max));
  }

  .grid,
  .stats-row {
    grid-template-columns: 1fr;
  }

  [class*="col-"] {
    grid-column: span 1;
  }

  .section {
    padding: 40px 0;
  }

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

  .footer_brand {
    grid-column: auto;
  }

  .footer_bottom_inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .footer_policy {
    margin-left: 0;
  }

  .footer_trust {
    padding: 14px 20px 24px;
  }
}

@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;
  }
}