* {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  display: flex;
}

@media (max-width: 910px) {
  body {
    flex-direction: column;
    overflow-x: hidden;
  }
}

.login-btn {
  background-color: #1877f2;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
}

.upload-btn {
  background-color: #f0f0f0;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
}

nav.sidebar {
  width: 220px;
  background-color: #0f0f0f;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  height: 96.3vh;
  position: sticky;
  top: 0;
}

.logo-phone {
  display: none;
}

nav.sidebar .logo {
  font-weight: bold;
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: #fff;
  text-align: center;
  user-select: none;
  display: block;
}

nav.sidebar a {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  border-radius: 8px;
  margin-bottom: 8px;
  transition: background-color 0.2s;
  gap: 10px;
}

nav.sidebar a:hover,
nav.sidebar a.active {
  background-color: #1877f2;
  color: white;
}

nav.sidebar a .nav-icon {
  font-size: 1.2rem;
  width: 24px;
  text-align: center;
}

.nav-icon {
  font-size: 1.3rem;
  cursor: pointer;
  user-select: none;
}

.settings-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: #333;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  min-width: 200px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

.settings-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.menu-item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  transition: background-color 0.2s;
  border-bottom: 1px solid #444;
}

.menu-item:hover {
  background-color: #444;
}

.menu-item:last-child {
  border-bottom: none;
}

.menu-item-icon {
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
}

main.content-area {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: calc(100% - 220px);
}

header.header {
  position: sticky;
  background: #0f0f0f;
  padding: 12px 20px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.header-left {
  display: flex;
  gap: 10px;
}

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

.menu-toggle {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
  padding: 8px;
  margin-right: 10px;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  background-color: #aaa;
  transition: all 0.3s ease;
  border-radius: 1px;
}

.menu-toggle:hover span {
  background-color: #1877f2;
}

.content-container {
  overflow-y: auto;
  max-width: none;
  margin: 16px auto;
  flex-grow: 1;
  width: 100%;
}

.content-container::-webkit-scrollbar {
  width: 8px;
}

.content-container::-webkit-scrollbar-track {
  background: #f0f2f5;
  border-radius: 4px;
}

.content-container::-webkit-scrollbar-thumb {
  background-color: #ccd0d5;
  border-radius: 4px;
}

.content-container::-webkit-scrollbar-thumb:hover {
  background-color: #a6a9ad;
}

@media (max-width: 910px) {
  nav.sidebar {
    width: 100%;
    flex-direction: row;
    justify-content: space-around;
    padding: 6px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    top: 0;
    z-index: 100;
    height: auto;
    flex-wrap: wrap;
    max-height: 120px;
    overflow: hidden;
  }

  nav.sidebar .logo {
    display: none;
  }

  .logo-phone {
    text-decoration: none;
    color: #fff;
    font-weight: 600;
    font-size: 1.325rem;
    font-weight: bold;
    display: inline;
  }

  nav.sidebar a {
    display: flex;
    align-items: center;
    padding: 6px 3px;
    color: #333;
    text-decoration: none;
    font-weight: 600;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: background-color 0.2s;
    gap: 1px;
  }

  nav.sidebar a .nav-icon {
    font-size: 1.0rem;
  }

  nav.sidebar a span {
    font-size: 0.85rem;
    color: #fff;
  }

  nav.sidebar {
    display: none;
  }

  header.header {
    justify-content: space-between;
    padding: 12px 16px;
  }

  .header-left,
  .header-right {
    gap: 10px;
  }

  .menu-toggle {
    margin-right: 5px;
  }

  .settings-menu {
    left: 5px;
    min-width: 180px;
  }

  main.content-area {
    width: 100%;
    height: auto;
    padding-bottom: 60px;
  }

  .content-container {
    max-width: 100%;
    margin: 0;
    padding-bottom: 20px;
  }

  .login-btn,
  .upload-btn {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
}