:root {
  --bg-primary: #0A1428;
  --bg-panel: #14243D;
  --bg-tag: #1E2E4A;
  --border: #2A4A6A;
  --accent-green: #00FF88;
  --accent-orange: #FF5E00;
  --text-main: #F5F7FA;
  --text-muted: #A0AABF;
  --gradient: linear-gradient(90deg, #00FF88, #FF5E00);
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Montserrat", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --header-height: 72px;
  --container-width: 1200px;
  --radius: 6px;
  --speed: 0.2s;
}

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

html {
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}

body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 85% 10%, rgba(0,255,136,0.07), transparent 35%),
    radial-gradient(ellipse at 8% 85%, rgba(255,94,0,0.06), transparent 35%);
}

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

a {
  color: var(--accent-green);
  text-decoration: none;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.15;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(28px, 4vw, 36px);
}

h3 {
  font-size: 24px;
}

p {
  margin: 0 0 1em;
}

::selection {
  background: rgba(0,255,136,0.3);
  color: var(--text-main);
}

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

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 5000;
  transform: translateY(-250%);
  background: var(--accent-green);
  color: #0A1428;
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--speed) ease-out;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 20, 40, 0.85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand__mark {
  width: 38px;
  height: 38px;
  border-radius: 8px 8px 8px 2px;
  background: var(--gradient);
  color: #0A1428;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 18px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px rgba(0,255,136,0.25);
}

.brand__text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--text-main);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 14px;
  color: var(--text-main);
  font-size: 14px;
  letter-spacing: 0.15em;
  transition: border-color var(--speed), box-shadow var(--speed), transform var(--speed);
}

.nav-toggle:hover {
  border-color: var(--accent-green);
  box-shadow: 0 0 16px rgba(0,255,136,0.25);
}

.nav-toggle:active {
  transform: scale(0.97);
}

.nav-toggle__label {
  text-transform: uppercase;
}

.nav-toggle__icon {
  position: relative;
  width: 16px;
  height: 12px;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-green);
  transition: transform var(--speed) ease-out;
}

.nav-toggle__icon::before {
  top: 0;
}

.nav-toggle__icon::after {
  bottom: 0;
}

body[data-nav-open] .nav-toggle__icon::before {
  transform: translateY(5px) rotate(45deg);
}

body[data-nav-open] .nav-toggle__icon::after {
  transform: translateY(-5px) rotate(-45deg);
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: min(420px, 86vw);
  z-index: 1200;
  background: linear-gradient(180deg, var(--bg-panel) 0%, var(--bg-primary) 100%);
  border-right: 1px solid var(--border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  visibility: hidden;
  transform: translateX(-102%);
  transition: transform var(--speed) ease-out, visibility 0s linear var(--speed);
}

body[data-nav-open] .site-nav {
  visibility: visible;
  transform: translateX(0);
  transition: transform var(--speed) ease-out, visibility 0s linear 0s;
}

.site-nav__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent-green);
  text-transform: uppercase;
}

.nav-close {
  font-size: 28px;
  line-height: 1;
  color: var(--text-muted);
  padding: 0 6px;
  transition: color var(--speed), transform var(--speed);
}

.nav-close:hover {
  color: var(--accent-orange);
  transform: rotate(90deg);
}

.site-nav__list {
  border-top: 1px solid rgba(42,74,106,0.5);
}

.site-nav__item {
  border-bottom: 1px solid rgba(42,74,106,0.5);
}

.site-nav__link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px 8px;
  color: var(--text-main);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  line-height: 1.2;
  text-decoration: none;
  transition: color var(--speed), padding-left var(--speed), box-shadow var(--speed);
}

.site-nav__link:hover {
  color: var(--accent-green);
  padding-left: 16px;
}

.site-nav__link[aria-current="page"] {
  color: var(--accent-green);
  box-shadow: inset 3px 0 0 var(--accent-green);
}

.site-nav__label {
  font-size: inherit;
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-orange);
  letter-spacing: 0.1em;
}

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

.site-nav__foot {
  margin-top: auto;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
}

.site-nav__foot strong {
  color: var(--accent-green);
  font-weight: 700;
}

.site-nav__overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(5, 10, 20, 0.75);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--speed) ease-out, visibility 0s linear var(--speed);
}

body[data-nav-open] .site-nav__overlay {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity var(--speed) ease-out;
}

body[data-nav-open] {
  overflow: hidden;
}

.site-footer {
  background: rgba(6, 12, 28, 0.9);
  border-top: 1px solid var(--border);
  margin-top: 0;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px 40px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 32px;
}

.site-footer__brand .brand {
  margin-bottom: 16px;
}

.site-footer .brand__mark {
  box-shadow: 0 0 14px rgba(0,255,136,0.2);
}

.site-footer .brand__text {
  color: var(--text-main);
}

.site-footer__desc {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 32em;
}

.site-footer__trust {
  color: var(--text-muted);
  font-size: 14px;
  max-width: 34em;
  border-left: 2px solid var(--accent-green);
  padding-left: 12px;
  margin-top: 8px;
}

.site-footer__heading {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 18px;
}

.site-footer__links li {
  margin-bottom: 10px;
}

.site-footer a {
  color: var(--text-muted);
  transition: color var(--speed), padding-left var(--speed);
}

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

.site-footer__contact p {
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-muted);
  word-break: break-all;
}

.site-footer__contact .site-footer__note {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(42,74,106,0.5);
  font-size: 13px;
  color: var(--text-muted);
}

.site-footer__bottom {
  border-top: 1px solid rgba(42,74,106,0.4);
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.site-footer__bottom p {
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-weight: 600;
  font-size: 16px;
  line-height: 1.5;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--speed), box-shadow var(--speed), border-color var(--speed), background var(--speed);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-green);
  color: #0A1428;
  border-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(0,255,136,0.25);
}

.btn-primary:hover {
  background: #00DE77;
  color: #0A1428;
  box-shadow: 0 0 32px rgba(0,255,136,0.45);
}

.btn-outline {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.btn-outline:hover {
  background: rgba(0,255,136,0.08);
  box-shadow: 0 0 16px rgba(0,255,136,0.3);
  color: var(--accent-green);
}

.btn--orange {
  background: var(--accent-orange);
  color: #0A1428;
  border-color: var(--accent-orange);
  box-shadow: 0 0 20px rgba(255,94,0,0.25);
}

.btn--orange:hover {
  background: #E85400;
  color: #0A1428;
  box-shadow: 0 0 28px rgba(255,94,0,0.45);
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform var(--speed), box-shadow var(--speed), border-color var(--speed);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-green);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 20px rgba(0,255,136,0.08);
}

.card--tilt {
  transform: rotate(-1.2deg);
}

.card--tilt:hover {
  transform: rotate(-1.2deg) translateY(-2px);
}

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

.bento-span-4 { grid-column: span 4; }
.bento-span-6 { grid-column: span 6; }
.bento-span-8 { grid-column: span 8; }
.bento-span-12 { grid-column: span 12; }

.data-num {
  font-family: var(--font-mono);
  color: var(--accent-green);
  font-weight: 500;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-tag);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-main);
}

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

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

.media {
  position: relative;
  overflow: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

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

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

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

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

.media__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 0.1em;
  background: repeating-linear-gradient(45deg, #16263F 0, #16263F 10px, #14243D 10px, #14243D 20px);
}

.media--tilt {
  transform: rotate(1.2deg);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}

.breadcrumb__item {
  font-size: 14px;
  color: var(--text-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--border);
}

.breadcrumb__item a {
  color: var(--text-muted);
  transition: color var(--speed);
}

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

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 3000;
  background: var(--gradient);
  pointer-events: none;
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 1500;
  width: 46px;
  height: 46px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(20, 36, 61, 0.9);
  color: var(--accent-green);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--speed), border-color var(--speed), box-shadow var(--speed);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.back-to-top[data-visible] {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--accent-green);
  box-shadow: 0 0 18px rgba(0,255,136,0.3);
}

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

  .site-footer__brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .site-header__inner {
    padding: 0 16px;
  }

  .brand__mark {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }

  .brand__text {
    font-size: 18px;
  }

  .nav-toggle {
    padding: 7px 10px;
  }

  .site-nav {
    width: 86vw;
    padding: 20px;
  }

  .section {
    padding: 48px 0;
  }

  .bento-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .bento-span-4,
  .bento-span-6,
  .bento-span-8,
  .bento-span-12 {
    grid-column: span 6;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .site-footer__brand {
    grid-column: auto;
  }

  .site-footer__bottom {
    padding: 16px;
    flex-direction: column;
    gap: 4px;
  }

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

  .container {
    padding: 0 16px;
  }
}

@media (max-width: 480px) {
  .nav-toggle__label {
    display: none;
  }

  .nav-toggle {
    gap: 0;
    padding: 10px;
  }

  .nav-toggle__icon {
    width: 18px;
  }
}

@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;
    transition-delay: 0s !important;
  }
}