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

html,
body {
  width: 100%;
  min-height: 100%;
}

body {
  background: #000;
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  overflow-x: hidden;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 24px 0 10px;
  border-bottom: 1px solid #1a1a1a;
  background: #000;
  z-index: 200;
}

.header-logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  text-decoration: none;
  cursor: pointer;
}

.header-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  pointer-events: none;
  user-select: none;
}

/* Search */
.search {
  width: min(480px, 40vw);
  height: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 14px;
  background: #0a0a0a;
  border: 1px solid #1a1a1a;
  border-radius: 10px;
  color: #666;
  transition: all 0.2s ease;
  flex: 1;
  max-width: 480px;
}

.search:focus-within {
  background: #0f0f0f;
  border-color: #2a2a2a;
}

.search svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.search input {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: #fff;
  font-size: 14px;
  font-family: inherit;
}

.search input::placeholder {
  color: #555;
}

/* Notification Button */
.notification-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: #666;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-left: auto;
}

.notification-btn svg {
  width: 20px;
  height: 20px;
}

.notification-btn:hover {
  color: #fff;
  background: #151515;
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 56px;
  bottom: 0;
  width: 60px;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  border-right: 1px solid #1a1a1a;
  z-index: 100;
  padding-bottom: 20px;
}

.navigation {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
}

.nav-item {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  border-radius: 11px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.nav-item svg {
  width: 21px;
  height: 21px;
}

.nav-item:hover {
  color: #fff;
  background: #151515;
}

.nav-item.active {
  color: #fff;
  background: #151515;
}

.nav-item-bottom {
  margin-bottom: 0;
}

/* Main */
.main {
  margin-left: 60px;
  margin-top: 56px;
  min-height: calc(100vh - 56px);
}

/* Content */
.content {
  min-height: calc(100vh - 56px);
  padding: 28px;
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.content-section h1 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #fff;
}

.content-section p {
  font-size: 16px;
  color: #999;
  line-height: 1.6;
}