* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f3f4f6;
  color: #222;
}

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  width: 220px;
  height: 100vh;
  background: #1f2937;
  color: #fff;
  padding: 20px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow-y: auto;
}

.sidebar-top {
  display: block;
}

.sidebar-title-row {
  display: block;
}

.mobile-account-menu,
.mobile-auth-footer {
  display: none;
}

.sidebar-bottom {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar h2 {
  margin: 0 0 20px;
  font-size: 20px;
}

.sidebar nav a {
  display: block;
  color: #fff;
  text-decoration: none;
  padding: 10px 12px;
  margin-bottom: 6px;
  border-radius: 6px;
}

.sidebar nav a:hover {
  background: rgba(255, 255, 255, 0.08);
}

.sidebar-auth {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-auth-text {
  font-size: 13px;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.85);
  word-break: break-word;
}

.sidebar-auth-link,
.sidebar-auth-button {
  display: inline-block;
  width: 100%;
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border-radius: 6px;
  font-size: 14px;
  text-align: center;
  cursor: pointer;
}

.sidebar-auth-link:hover,
.sidebar-auth-button:hover {
  background: rgba(255, 255, 255, 0.12);
}

.logout-form {
  margin: 0;
}

.main {
  flex: 1;
  min-width: 0;
  padding: 28px;
  overflow-x: hidden;
}

.page-header {
  margin-bottom: 20px;
}

.page-header h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
}

.page-intro {
  max-width: 760px;
  margin: 8px 0 0;
  color: #64748b;
  font-size: 14px;
  line-height: 1.5;
}

@media (max-width: 760px) {
  .layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    min-height: 0;
    padding: 16px;
    display: block;
    overflow: visible;
  }

  .sidebar-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
    position: relative;
  }

  .sidebar h2 {
    margin: 0;
    font-size: 22px;
  }

  .mobile-account-menu {
    display: block;
    position: relative;
    flex: 0 0 auto;
    z-index: 40;
  }

  .mobile-account-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.07);
    color: #fff;
    cursor: pointer;
    list-style: none;
  }

  .mobile-account-button::-webkit-details-marker {
    display: none;
  }

  .mobile-account-icon {
    width: 22px;
    height: 22px;
    color: #fff;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .mobile-account-menu[open] .mobile-account-button,
  .mobile-account-button:hover {
    background: rgba(255, 255, 255, 0.14);
  }

  .mobile-account-panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: min(260px, calc(100vw - 24px));
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    background: #111827;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.34);
  }

  .mobile-account-panel .sidebar-auth-text {
    margin-bottom: 10px;
  }

  .sidebar nav {
    display: flex;
    gap: 8px;
    margin: 0 -4px;
    padding: 0 4px 4px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar nav a {
    flex: 0 0 auto;
    margin: 0;
    padding: 9px 12px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.05);
    font-size: 14px;
    white-space: nowrap;
  }

  .sidebar-bottom {
    display: none;
  }

  .mobile-auth-footer {
    display: block;
    margin-top: auto;
    padding: 18px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    background: #1f2937;
    color: #fff;
  }

  .mobile-auth-footer .sidebar-auth {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
  }

  .mobile-auth-footer .sidebar-auth-text {
    color: rgba(255, 255, 255, 0.85);
  }

  .mobile-auth-footer .sidebar-auth-button,
  .mobile-auth-footer .sidebar-auth-link {
    width: auto;
    border-color: rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    white-space: nowrap;
  }

  .mobile-auth-footer .sidebar-auth-button:hover,
  .mobile-auth-footer .sidebar-auth-link:hover {
    background: rgba(255, 255, 255, 0.12);
  }

  .main {
    flex: 1 0 auto;
    padding: 18px 14px 28px;
    overflow-x: visible;
  }

  .page-header {
    margin-bottom: 16px;
  }

  .page-header h1 {
    font-size: 26px;
  }
}

@media (max-width: 420px) {
  .sidebar {
    padding: 14px 12px;
  }

  .sidebar h2 {
    font-size: 20px;
  }

  .mobile-auth-footer .sidebar-auth {
    grid-template-columns: 1fr;
  }

  .mobile-auth-footer .sidebar-auth-button,
  .mobile-auth-footer .sidebar-auth-link {
    width: 100%;
  }

  .main {
    padding: 16px 10px 24px;
  }
}