/* === Root Variables === */
:root {
  /* === Palette === */
  --bg-app: #ffffff;
  --surface-base: #ffffff;
  --surface-soft: #f9f9f9;
  /* Extremely subtle gray */
  --surface-hover: #f5f5f5;

  --border-subtle: #e5e5e5;
  --border-focus: #111111;

  /* Typography Colors */
  --text-main: #111111;
  --text-subtle: #757575;
  --text-inverse: #ffffff;

  /* Brand */
  --accent: #111111;
  /* Monochrome aesthetic */

  /* Spacing */
  --spacing-base: 0.25rem;
  --page-gutter: 3rem;
  /* Increased for a more spacious, premium feel */

  --spacing-xs: calc(var(--spacing-base) * 1);
  --spacing-sm: calc(var(--spacing-base) * 2);
  --spacing-md: calc(var(--spacing-base) * 4);
  --spacing-lg: calc(var(--spacing-base) * 8);
  /* Increased for grandeur */
  --spacing-xl: calc(var(--spacing-base) * 16);

  --sidebar-width: 260px;

  /* Typography */
  --font-main: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
  /* Clean, classic */
  --radius-sm: 8px;
  /* Modern soft edges */
  --radius-md: 12px;
  /* Very subtle rounding if needed */
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-app);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

/* === Layout === */
.layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--surface-base);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 50;
}

.sidebar-header {
  padding: var(--page-gutter);
  padding-bottom: var(--spacing-lg);
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  /* Bold branding */
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.sidebar-nav {
  flex: 1;
  padding: 0 var(--page-gutter);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.nav-link {
  display: block;
  padding: 0.75rem 0;
  /* Minimal vertical padding, no background */
  color: var(--text-subtle);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-main);
}

.sidebar-footer {
  padding: var(--page-gutter);
  border-top: 1px solid var(--border-subtle);
}

/* Main Content */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  position: relative;
}

.header-bar {
  padding: var(--page-gutter);
  display: flex;
  align-items: center;
  /* border-bottom: 1px solid var(--border-subtle);  Optional: remove for cleaner look */
}

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  margin-right: var(--spacing-md);
  color: var(--text-main);
}

.content-area {
  padding: var(--page-gutter);
  /* No top padding if header is present */
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Overlay (Mobile) */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(2px);
  z-index: 40;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.overlay.active {
  opacity: 1;
}

/* === Responsive === */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    transform: translateX(-100%);
    box-shadow: 10px 0 20px rgba(0, 0, 0, 0.05);
  }

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

  .hamburger {
    display: block;
  }

  .overlay.active {
    display: block;
  }

  .main {
    width: 100%;
  }
}

/* === Utilities === */
.title-lg {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-md);
}

.title-md {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.text-subtle {
  color: var(--text-subtle);
}

.btn {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--accent);
  color: var(--text-inverse);
  font-weight: 600;
  border-radius: var(--radius-sm);
  /* Sharp buttons? */
  border: none;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.btn:hover {
  opacity: 0.8;
}

/* Fragment Container Styling */
.fragment-container {
  margin-bottom: var(--page-gutter);
}

@keyframes pulse {

  0%,
  100% {
    opacity: 0.5;
  }

  50% {
    opacity: 0.3;
  }
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* === Components === */
.card {
  background: var(--surface-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

/* === Spacing Utilities === */
.p-2 {
  padding: 0.5rem;
}

.p-3 {
  padding: 0.75rem;
}

.p-4 {
  padding: 1rem;
}

.p-5 {
  padding: 1.25rem;
}

.p-6 {
  padding: 1.5rem;
}

.p-8 {
  padding: 2rem;
}

.p-10 {
  padding: 2.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-1 {
  margin-bottom: 0.25rem;
}

.shadow {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.bg-white {
  background-color: #ffffff;
}

.text-center {
  text-align: center;
}

.text-gray-500 {
  color: #6b7280;
}