:root {
  --bg: #0e1116;
  --card: #12161b;
  --card-2: #161b22;
  --border: #1f2630;
  --text: #e6edf3;
  --subtext: #9aa4b2;
  --accent: #4c8bf5;
  --accent-hover: #3e7bf0;
  --ring: rgba(76, 139, 245, 0.3);
  --transition: 0.25s;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html, body {
  height: 100%;
}
body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.page-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
  backdrop-filter: saturate(140%) blur(6px);
}
.page-header-left-group {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}
.logo {
  height: 40px;
}
.page-header-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.header-button {
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}
.header-button:hover {
  border-color: var(--accent);
  background: rgba(76, 139, 245, 0.08);
  box-shadow: 0 0 0 3px var(--ring);
}
.header-button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.page-header-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  position: relative;
  margin-left: auto;
}
.menu-container {
  position: relative;
}
.menu-icon {
  font-size: 1.35rem;
  color: var(--text);
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.4rem 0.6rem;
  transition: color var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.menu-icon:hover {
  color: #fff;
  border-color: var(--accent);
  background: rgba(76, 139, 245, 0.08);
  box-shadow: 0 0 0 3px var(--ring);
}
.header-menu {
  display: none;
  position: absolute;
  top: 2.6rem;
  right: 0;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 12px 28px rgba(0,0,0,0.45);
  overflow: hidden;
  white-space: nowrap;
  width: calc(100vw - 3rem);
  max-width: 320px;
}
.header-menu.show-menu {
  display: block;
}
.mobile-menu-nav {
  display: none;
  flex-direction: column;
  padding: 0.5rem;
  gap: 0.2rem;
}
.header-menu .menu-item {
  display: block;
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.header-menu .menu-item:hover {
  background: rgba(76, 139, 245, 0.08);
  border-color: var(--accent);
}
.header-menu .menu-item.active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}
.menu-separator {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0.4rem 0;
}
.menu-footer {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem;
  gap: 0.5rem;
}
main {
  margin-top: 66px;
  padding: 2rem 1.2rem;
  min-height: calc(100vh - 66px);
}
footer {
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 1rem 1.2rem;
  text-align: center;
  color: var(--subtext);
}
.mobile-brand {
  order: -1;
  display: none;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.35rem 0.6rem;
}
.mobile-brand-logo {
  display: block;
}
@media (max-width: 1180px) {
  .mobile-brand {
    display: flex;
  }
  .page-header-left-group {
    display: none;
  }
  .page-header-right > .header-button {
    display: none;
  }
  .menu-icon {
    display: block;
  }
  .mobile-menu-nav {
    display: flex;
  }
}
@media (max-width: 768px) {
  .page-header-nav {
    display: none;
  }
  .menu-icon {
    display: block;
  }
}
@media (min-width: 1181px) {
  .header-menu {
    width: auto;
    max-width: 260px;
  }
  .header-menu .menu-item {
    padding: 0.5rem 0.7rem;
    font-size: 0.92rem;
  }
  .menu-separator {
    display: none;
  }
  .menu-footer {
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
  }
}