/* App Shell - Core Layout & Sidebar Styles */

/* === Reset & Base === */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --sidebar-width: 250px;
  --sidebar-bg: #0f0f23;
  --sidebar-border: #1e1e3a;
  --sidebar-text: #c8c8e0;
  --sidebar-text-hover: #ffffff;
  --sidebar-active-bg: rgba(100, 80, 200, 0.2);
  --sidebar-active-border: #7c5cfc;
  --sidebar-hover-bg: rgba(100, 80, 200, 0.1);
  --content-bg: #1a1a2e;
  --accent-primary: #7c5cfc;
  --accent-secondary: #ff6b35;
  --text-primary: #eaeaea;
  --text-muted: #8888aa;
  --hamburger-size: 44px;
  --transition-speed: 0.3s;
  --backdrop-bg: rgba(0, 0, 0, 0.5);
}

html,
body {
  height: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--content-bg);
  color: var(--text-primary);
}

/* === App Layout === */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* === Sidebar === */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform var(--transition-speed) ease;
}

.sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-header h1 {
  font-size: 1.25rem;
  color: var(--accent-secondary);
  text-shadow: 0 0 8px rgba(255, 107, 53, 0.25);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  padding: 16px 16px 8px;
}

/* === Sidebar Navigation Items === */
.sidebar-nav {
  flex: 1;
  padding: 0 8px;
}

.sidebar-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav-item {
  margin-bottom: 2px;
}

.sidebar-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  border-left: 3px solid transparent;
  transition: background-color var(--transition-speed) ease,
              color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

.sidebar-nav-link:hover {
  background: var(--sidebar-hover-bg);
  color: var(--sidebar-text-hover);
}

.sidebar-nav-link:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: -2px;
}

.sidebar-nav-link.active {
  background: var(--sidebar-active-bg);
  color: var(--sidebar-text-hover);
  border-left-color: var(--sidebar-active-border);
  font-weight: 600;
}

.sidebar-nav-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

.sidebar-nav-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* === Sidebar Footer === */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--sidebar-border);
  margin-top: auto;
}

.language-selector {
  margin-bottom: 8px;
}

.language-selector label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.language-selector select {
  width: 100%;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--sidebar-border);
  background: #16163a;
  color: var(--sidebar-text);
  font-size: 0.85rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.language-selector select:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: -1px;
}

.sidebar-version {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  padding-top: 4px;
}

/* === Content Area === */
.content-area {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  padding: 20px;
  transition: margin-left var(--transition-speed) ease;
  display: flex;
  flex-direction: column;
}

.content-container {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

/* === Hamburger Menu Button === */
.hamburger-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1100;
  width: var(--hamburger-size);
  height: var(--hamburger-size);
  border: none;
  border-radius: 8px;
  background: var(--sidebar-bg);
  border: 1px solid var(--sidebar-border);
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  transition: background-color var(--transition-speed) ease;
}

.hamburger-btn:hover {
  background: #1a1a3a;
}

.hamburger-btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.hamburger-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--sidebar-text);
  border-radius: 2px;
  transition: transform var(--transition-speed) ease,
              opacity var(--transition-speed) ease;
}

/* Hamburger to X animation when sidebar is open */
.hamburger-btn.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.is-active span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* === Sidebar Backdrop Overlay === */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--backdrop-bg);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition-speed) ease;
}

.sidebar-backdrop.is-visible {
  display: block;
  opacity: 1;
}

/* === Error Message in Content Area === */
.module-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
}

.module-error-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.module-error-message {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.module-error-details {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* === Responsive: Mobile < 768px === */
@media (max-width: 767px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .hamburger-btn {
    display: flex;
  }

  .content-area {
    margin-left: 0;
    padding-top: 68px; /* Space for hamburger button */
  }
}

/* === Responsive: Desktop >= 768px === */
@media (min-width: 768px) {
  .sidebar {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    display: none !important;
  }

  .hamburger-btn {
    display: none !important;
  }
}

/* === Loading State === */
.content-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.content-loading::after {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  margin-left: 10px;
  border: 2px solid var(--sidebar-border);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* === Scrollbar Styling (sidebar) === */
.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--sidebar-border);
  border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}