:root {
  /* Core Palette */
  --bg-color: #09090b;
  --panel-bg: rgba(24, 24, 27, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --accent-primary: #ffb642;

  /* Level Colors */
  --lvl0-color: #e2e8f0;
  --lvl1-color: #4ade80;
  --lvl2-color: #fbbf24;
  --lvl3-color: #f87171;
  --lvl4-color: #71717a;
  --lvl5-color: #a855f7;
  --lvl-sub-color: #14b8a6;

  /* Dimensions */
  --header-height: 64px;
  --nav-height: 72px;
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, .logo-text {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
}

/* Glassmorphism Utility */
.glass {
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
}

/* Header */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.header-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-size: 1.25rem;
  background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Bottom Nav */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: calc(var(--nav-height) + var(--safe-area-bottom));
  background: rgba(9, 9, 11, 0.9);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-around;
  align-items: flex-start;
  padding-top: 0.75rem;
  z-index: 100;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 25%;
}

.nav-btn.active {
  color: var(--accent-primary);
}

.nav-btn.active .nav-icon {
  transform: translateY(-2px);
  filter: drop-shadow(0 0 10px var(--accent-primary));
}

.nav-icon {
  font-size: 1.35rem;
}

.nav-label {
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* Search View */
.search-container {
    margin-bottom: 2rem;
}

.search-input-wrapper {
    position: relative;
    width: 100%;
}

.search-input {
    width: 100%;
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem 1rem 1rem 3rem;
    color: var(--text-primary);
    font-size: 1.1rem;
    outline: none;
    transition: all 0.3s;
}

.search-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.search-icon-overlay {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    opacity: 0.5;
}

.search-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.search-result-item {
    padding: 1.5rem;
    border-radius: 12px;
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: all 0.2s;
}

.search-result-item:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.result-meta {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--accent-primary);
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: block;
}

/* Cheat Sheet View */
.cheatsheet-grid {
    display: grid;
    gap: 1.5rem;
}

.cheatsheet-category {
    margin-bottom: 2rem;
}

.category-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.command-card {
    padding: 1rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    margin-bottom: 1rem;
}

/* About View */
.about-view {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.vault-id-card {
    padding: 2.5rem;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(9, 9, 11, 0) 100%);
    border: 1px solid var(--accent-primary);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.vault-id-card::after {
    content: '813';
    position: absolute;
    bottom: -20px;
    right: -10px;
    font-size: 8rem;
    font-weight: 900;
    opacity: 0.05;
    font-family: 'Outfit', sans-serif;
}

/* Main Content Area */
#main-content {
  padding: calc(var(--header-height) + 1.5rem) 1rem calc(var(--nav-height) + 2rem);
  max-width: 1200px;
  margin: 0 auto;
}

/* Home / Dashboard Styles */
.dashboard-title {
  margin-bottom: 2rem;
  text-align: center;
}

.level-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .level-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .level-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.level-card {
  position: relative;
  padding: 1.5rem;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease;
  cursor: pointer;
  overflow: hidden;
  height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.level-card:hover {
  transform: translateY(-8px);
  border-color: var(--card-accent);
  box-shadow: 0 12px 24px -10px var(--card-accent-transparent);
}

.level-number {
  font-size: 0.875rem;
  font-weight: 700;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.level-card h3 {
  font-size: 1.5rem;
  margin-top: 0.25rem;
}

.level-topics {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Level Specific Accent Markers */
.level-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--card-accent);
  border-radius: 4px 0 0 4px;
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.btn-secondary {
  background: var(--panel-bg);
  border-color: var(--glass-border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(39, 39, 42, 0.9);
}

/* Loader */
.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 40vh;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-left-color: var(--accent-primary);
  border-radius: 50%;
  animation: rotate 1s linear infinite;
}

@keyframes rotate {
  100% { transform: rotate(360deg); }
}

/* Cheat Sheet styles */
.cheat-sheet-view {
  animation: fadeIn 0.4s ease-out;
}

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

.back-btn {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.topic-section {
  margin-bottom: 2.5rem;
}

.topic-section h2 {
  margin-bottom: 1.25rem;
  font-size: 1.75rem;
}

.code-block {
  background: #000;
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1rem;
  position: relative;
  margin: 1rem 0;
  overflow-x: auto;
}

.code-block pre {
  font-family: 'ui-monospace', 'SFMono-Regular', 'Menlo', 'Monaco', 'Consolas', monospace;
  font-size: 0.85rem;
  color: #e4e4e7;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  cursor: pointer;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Callouts & Special Blocks */
.callout {
    padding: 1rem;
    border-radius: 12px;
    margin: 1.5rem 0;
    border-left: 4px solid var(--accent);
    background: rgba(255, 255, 255, 0.03);
}

.callout-goal { --accent: var(--lvl1-color); }
.callout-important { --accent: var(--lvl3-color); }
.callout-info { --accent: var(--accent-primary); }
.callout-practice { --accent: var(--lvl2-color); }

.callout-title {
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    display: block;
    color: var(--accent);
}

/* Good vs Bad Comparison */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 1rem 0;
}

@media (min-width: 640px) {
    .comparison-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.comp-box {
    padding: 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.comp-bad { border-color: rgba(248, 113, 113, 0.3); background: rgba(248, 113, 113, 0.05); }
.comp-good { border-color: rgba(74, 222, 128, 0.3); background: rgba(74, 222, 128, 0.05); }

.comp-label {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

/* Refined typography for readability */
.topic-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.topic-section ul {
    margin-left: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.topic-section li {
    margin-bottom: 0.5rem;
}

.interactive-container h3 {
    margin-bottom: 1rem;
}

body::before {
  content: " ";
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.1) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.03), rgba(0, 255, 0, 0.01), rgba(0, 0, 255, 0.03));
  z-index: 1000;
  background-size: 100% 3px, 3px 100%;
  pointer-events: none;
  opacity: 0.2;
}

svg {
  width: 1.5rem;
  height: 1.5rem;
  stroke: var(--accent-primary);
  filter: drop-shadow(0 0 2px var(--accent-primary));
}

.nav-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.level-card:hover svg {
    filter: drop-shadow(0 0 8px var(--accent-primary));
    transform: scale(1.1);
    transition: all 0.3s ease;
}

.logo-icon svg {
    width: 2rem;
    height: 2rem;
    margin-right: 0.5rem;
}