:root {
  --color-primary: #FF4500;
  --color-secondary: #1E90FF;
  --color-accent: #FFD700;
  --color-bg: #0A0A0A;
  --color-bg-alt: #111111;
  --color-text: #FFFFFF;
  --color-text-secondary: #B0B0B0;
  --color-border: #333333;
  --color-success: #00FF7F;
  --color-overlay: rgba(10, 10, 10, 0.85);
  --font-display: 'Impact', 'Arial Black', 'Helvetica Neue', sans-serif;
  --font-mono: 'Consolas', 'Source Code Pro', 'Courier New', monospace;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --max-width: 1280px;
  --header-height: 64px;
  --nav-gap: 4px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --shadow-nav: 0 4px 32px rgba(0, 0, 0, 0.6);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

ul,
ol {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== Skip Link ===== */
.skip-link {
  position: fixed;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 8px 20px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 16px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
  padding: 0 20px;
}

.site-header[data-scrolled] {
  background: var(--color-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border), 0 0 40px rgba(255, 69, 0, 0.06);
}

.header__inner {
  width: 100%;
  max-width: var(--max-width);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
  position: relative;
  z-index: 1;
  transition: color var(--transition);
  flex-shrink: 0;
}

.header__brand::after {
  content: '';
  display: block;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 2px;
  margin-top: 2px;
  transform: scaleX(0.6);
  transform-origin: left;
  transition: transform var(--transition);
}

.header__brand:hover::after {
  transform: scaleX(1);
}

.header__brand:hover {
  color: var(--color-primary);
}

/* Navigation */
.header__nav {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--nav-gap);
}

.nav__item {
  position: relative;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: 100px;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-text);
  background: rgba(255, 69, 0, 0.12);
}

.nav__link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  background: rgba(255, 69, 0, 0.08);
}

.nav__link[aria-current="page"] {
  color: var(--color-primary);
  background: rgba(255, 69, 0, 0.15);
  box-shadow: 0 0 0 1px rgba(255, 69, 0, 0.25), 0 0 20px rgba(255, 69, 0, 0.05);
  font-weight: 600;
}

/* Toggle Button */
.header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  z-index: 100;
}

.header__toggle:hover {
  background: rgba(255, 255, 255, 0.05);
}

.header__toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}

.header__toggle[aria-expanded="true"] .toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__toggle[aria-expanded="true"] .toggle__bar:nth-child(2) {
  opacity: 0;
}

.header__toggle[aria-expanded="true"] .toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 48px 20px 32px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  opacity: 0.6;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 60px;
  position: relative;
  z-index: 1;
}

.footer__brand {
  grid-column: 1 / 2;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  display: inline-block;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--color-text) 60%, var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer__trust {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 420px;
}

.footer__contact {
  grid-column: 2 / 3;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact__item {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.contact__label {
  color: var(--color-text);
  font-weight: 500;
  min-width: 44px;
}

.contact__link {
  color: var(--color-secondary);
  transition: color var(--transition);
}

.contact__link:hover {
  color: var(--color-primary);
}

.contact__text {
  color: var(--color-text-secondary);
}

.footer__bottom {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 32px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
  margin-top: 8px;
}

.footer__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.footer__icp {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

.footer__divider {
  color: var(--color-border);
  font-size: 0.75rem;
}

.footer__note {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.footer__countdown {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  background: rgba(255, 215, 0, 0.06);
  padding: 6px 18px;
  border-radius: 100px;
  border: 1px solid rgba(255, 215, 0, 0.15);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.countdown__days {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-primary);
  min-width: 28px;
  text-align: center;
}

.footer__links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer__link {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  transition: color var(--transition);
  position: relative;
}

.footer__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.footer__link:hover {
  color: var(--color-primary);
}

.footer__link:hover::after {
  transform: scaleX(1);
}

/* ===== Utility Classes ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 100px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  opacity: 0;
  transition: opacity var(--transition);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 69, 0, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255, 69, 0, 0.35);
}

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

.btn--secondary {
  background: transparent;
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
  box-shadow: 0 4px 16px rgba(30, 144, 255, 0.1);
}

.btn--secondary:hover {
  background: rgba(30, 144, 255, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(30, 144, 255, 0.2);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  padding: 12px 0;
}

.breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.breadcrumb .breadcrumb__separator {
  color: var(--color-border);
  font-size: 0.7rem;
}

.breadcrumb .breadcrumb__current {
  color: var(--color-text);
  font-weight: 500;
}

/* Panel */
.panel {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.panel:hover {
  border-color: rgba(255, 69, 0, 0.2);
  box-shadow: 0 4px 24px rgba(255, 69, 0, 0.04);
}

.panel--angled {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  border-radius: 0;
}

.panel--angled-left {
  clip-path: polygon(12px 0, 100% 0, 100% 100%, 0 100%, 0 12px);
  border-radius: 0;
}

/* Speedline decoration */
.speedline {
  position: relative;
  overflow: hidden;
}

.speedline::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 8px,
    rgba(255, 69, 0, 0.03) 8px,
    rgba(255, 69, 0, 0.03) 9px
  );
  pointer-events: none;
  z-index: 0;
}

/* Data number */
.data-number {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.data-number--secondary {
  color: var(--color-secondary);
}

.data-number--accent {
  color: var(--color-accent);
}

/* ===== Progress Bar ===== */
.progress-bar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  z-index: 8999;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ===== Main Content ===== */
#main-content {
  min-height: 60vh;
  padding-top: var(--header-height);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer__brand,
  .footer__contact {
    grid-column: 1 / -1;
  }
  
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header__toggle {
    display: flex;
  }

  .header__nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
    z-index: 90;
  }

  .header__nav[data-open] {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__list {
    flex-direction: column;
    gap: 8px;
  }

  .nav__link {
    font-size: 1.125rem;
    padding: 14px 36px;
    width: 100%;
    text-align: center;
  }

  .header__brand {
    font-size: 1.25rem;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .footer__links {
    flex-wrap: wrap;
    gap: 12px 20px;
  }

  .footer__meta {
    flex-wrap: wrap;
  }

  .panel {
    padding: 20px 20px;
  }
}

@media (max-width: 480px) {
  .header__brand {
    font-size: 1.1rem;
  }

  .nav__link {
    font-size: 1rem;
    padding: 12px 28px;
  }

  .footer__trust {
    font-size: 0.8rem;
  }

  .contact__item {
    font-size: 0.8rem;
  }

  .footer__countdown {
    font-size: 0.8rem;
    padding: 4px 14px;
  }

  .countdown__days {
    font-size: 1rem;
  }
}

/* ===== Focus-visible & Reduced Motion ===== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }

  .header__nav {
    transition: none;
  }

  .skip-link {
    transition: none;
  }

  .btn {
    transition: none;
  }

  .btn:hover {
    transform: none !important;
  }
}