/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: #333;
  background: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
:focus-visible {
  outline: 2px solid #00A86B;
  outline-offset: 2px;
}
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { background: none; border: none; cursor: pointer; font: inherit; color: inherit; }
/* ===== Content Container ===== */
.content-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
/* ===== CSS Variables ===== */
:root {
  --color-black: #000;
  --color-white: #fff;
  --color-darkgray: #333;
  --color-midgray: #666;
  --color-lightgray: #ccc;
  --color-green: #00A86B;
  --color-blue: #0066FF;
  --color-red: #FF3333;
  --color-gold: #FFD700;
  --font-heading: 'Inter', 'Helvetica Neue', sans-serif;
  --font-body: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --header-height: 64px;
  --transition-speed: 0.3s;
}
/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 9999;
  background: var(--color-green);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 0;
}
/* ===== Site Header ===== */
.site-header {
  background: var(--color-black);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 2px solid var(--color-green);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  position: relative;
}
.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.brand__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.2;
}
.brand__subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-green);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
/* ===== Navigation ===== */
.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1001;
}
.nav-toggle__icon,
.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition-speed) ease;
  position: absolute;
}
.nav-toggle__icon { position: static; }
.nav-toggle__icon::before { transform: translateY(-7px); }
.nav-toggle__icon::after { transform: translateY(7px); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  transform: rotate(45deg) translate(0, 0);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  transform: rotate(-45deg) translate(0, 0);
}
.main-nav {
  display: flex;
}
.nav-list {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0;
  position: relative;
  color: var(--color-white);
  transition: color var(--transition-speed);
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-green);
}
.nav-link[aria-current="page"] {
  color: var(--color-green);
}
.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-green);
}
.nav-overlay {
  display: none;
}
/* ===== Mobile Navigation States ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--color-black);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 2rem 1.5rem;
    transform: translateX(100%);
    transition: transform var(--transition-speed) ease;
    z-index: 1000;
  }
  .main-nav[data-open="true"] {
    transform: translateX(0);
  }
  .nav-list {
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
    text-align: center;
  }
  .nav-link {
    font-size: 1.125rem;
  }
  .nav-overlay {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed);
    z-index: 999;
  }
  .nav-overlay[data-open="true"] {
    opacity: 1;
    pointer-events: auto;
  }
}
/* ===== Site Footer ===== */
.site-footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: 3rem 0 2rem;
  margin-top: auto;
  border-top: 2px solid var(--color-green);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}
.footer-brand__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  text-transform: uppercase;
  display: block;
}
.footer-brand__subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-green);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-top: 0.25rem;
}
.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-nav-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-lightgray);
  transition: color var(--transition-speed);
  position: relative;
  padding-left: 1rem;
}
.footer-nav-link::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-green);
}
.footer-nav-link:hover,
.footer-nav-link:focus-visible {
  color: var(--color-green);
}
.footer-contact {
  font-size: 0.875rem;
  line-height: 1.8;
}
.footer-contact__item {
  margin-bottom: 0.25rem;
}
.footer-contact__item a {
  color: var(--color-green);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.footer-legal {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-midgray);
  font-size: 0.8rem;
  color: var(--color-midgray);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.footer-icp {
  font-family: var(--font-mono);
}
.footer-copyright {
  font-family: var(--font-mono);
}
/* ===== Shared Arrow Up ===== */
.arrow-up {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-green);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-speed), transform var(--transition-speed);
  pointer-events: none;
}
.arrow-up[data-visible="true"] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.arrow-up:hover,
.arrow-up:focus-visible {
  background: var(--color-gold);
  color: var(--color-black);
}
/* ===== Accordion ===== */
[data-accordion-content] {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding-top: 0;
  padding-bottom: 0;
}
[data-accordion-content][data-open="true"] {
  max-height: 1000px; /* enough for typical content */
  padding-top: 1rem;
  padding-bottom: 1rem;
}
[data-accordion-trigger] {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-darkgray);
  background: transparent;
  border-bottom: 1px solid var(--color-lightgray);
  cursor: pointer;
  transition: color var(--transition-speed);
}
[data-accordion-trigger]:hover {
  color: var(--color-green);
}
[data-accordion-trigger]::after {
  content: '+';
  font-size: 1.25rem;
  transition: transform var(--transition-speed);
}
[data-accordion-trigger][aria-expanded="true"]::after {
  content: '−';
}
/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}