/**
 * Layout Styles
 * Header, Sidebar, Main Content, Description Panel
 */

/* App Container */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: var(--z-fixed);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 0 var(--space-6);
  max-width: var(--content-max-width);
  margin: 0 auto;
  position: relative;
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-img {
  height: 36px;
  width: auto;
}

.header__menu-btn {
  position: absolute;
  left: var(--space-4);
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-gray-600);
  transition: all var(--transition-fast);
}

.header__menu-btn:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.header__menu-btn.active {
  color: var(--color-brand);
}

/* Main Layout */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--description-panel-width);
  min-height: 100vh;
  padding-top: var(--header-height);
  padding-bottom: var(--player-height);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: var(--player-height);
  width: var(--sidebar-width);
  background: var(--color-white);
  border-right: 1px solid var(--color-gray-200);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: var(--z-sticky);
}

.sidebar__nav {
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  color: var(--color-gray-600);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.sidebar__link:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.sidebar__link.active {
  background: var(--color-brand-alpha);
  color: var(--color-brand);
}

.sidebar__link.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.sidebar__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar__badge {
  margin-left: auto;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-gray-200);
  color: var(--color-gray-500);
  border-radius: var(--radius-full);
}

.sidebar__live {
  margin-top: auto;
  padding: var(--space-4);
  border-top: 1px solid var(--color-gray-200);
}

/* Live Button */
.live-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-gray-900);
  color: var(--color-white);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.live-btn:hover {
  background: var(--color-gray-800);
}

.live-btn--active {
  background: var(--color-brand);
}

.live-btn--active:hover {
  background: var(--color-brand-dark);
}

.live-btn__dot {
  width: 8px;
  height: 8px;
  background: var(--color-error);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Main Content */
.main {
  grid-column: 2;
  min-height: calc(100vh - var(--header-height) - var(--player-height));
  background: var(--color-gray-50);
  padding-left: var(--sidebar-width);
}

.main__content {
  padding: var(--space-8);
  max-width: 1000px;
  margin: 0 auto;
}

/* Description Panel */
.description-panel {
  position: fixed;
  top: var(--header-height);
  right: 0;
  bottom: var(--player-height);
  width: var(--description-panel-width);
  background: var(--color-white);
  border-left: 1px solid var(--color-gray-200);
  overflow-y: auto;
  z-index: var(--z-sticky);
}

.description-panel__content {
  padding: var(--space-6);
}

.description-panel__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  text-align: center;
  color: var(--color-gray-400);
}

.description-panel__placeholder svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
}

.description-panel__placeholder p {
  font-size: var(--text-sm);
}

.description-panel__text h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  color: var(--color-gray-900);
}

.description-panel__body {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
}

.description-panel__body p {
  margin-bottom: var(--space-3);
}

.description-panel__body a {
  color: var(--color-brand);
  text-decoration: underline;
}

/* View Styles */
.view {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.view__header {
  margin-bottom: var(--space-8);
}

.view__title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.view__subtitle {
  font-size: var(--text-base);
  color: var(--color-gray-500);
}

/* Responsive Layout */
@media (max-width: 1280px) {
  :root {
    --description-panel-width: 280px;
  }
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: var(--sidebar-width) 1fr;
  }
  
  .description-panel {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
    --sidebar-width: 280px;
    --player-height: 72px;
  }
  
  .header__menu-btn {
    display: flex;
  }
  
  .header__logo-img {
    height: 28px;
  }
  
  .layout {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-xl);
  }
  
  .sidebar--open {
    transform: translateX(0);
  }
  
  .main {
    padding-left: 0;
  }
  
  .main__content {
    padding: var(--space-4);
  }
  
  .view__title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 480px) {
  .main__content {
    padding: var(--space-3);
  }
}