/* DESIGN TOKENS (Material-inspired) */
/* Default to Dark Theme */
:root {
  --bg-primary: #1e1e1e;
  --bg-secondary: #242424;

  --surface: #1e1e1e;
  --surface-variant: #2a2a2a;
  --surface-elevated: #303030;

  --text-primary: rgba(255,255,255,.87);
  --text-secondary: rgba(255,255,255,.6);

  --accent: #d0bcff;
  --accent-hover: #baa1f3;
  --on-accent: #381e72;

  --outline: rgba(255,255,255,.12);
  --shadow: rgba(0,0,0,.6);

  --transition: all .25s cubic-bezier(.4,0,.2,1);
}

/* Light Theme */
#theme-switcher:checked ~ .app {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;

  --surface: #ffffff;
  --surface-variant: #f1f3f4;
  --surface-elevated: #ffffff;

  --text-primary: rgba(0,0,0,.87);
  --text-secondary: rgba(0,0,0,.6);

  --accent: #6750a4;
  --accent-hover: #583da3;
  --on-accent: #ffffff;

  --outline: rgba(0,0,0,.12);
  --shadow: rgba(0,0,0,.15);
}

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

body {
  font-family: "Poppins", system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  min-height: 100vh;
  transition: var(--transition);
}

.hidden-checkbox {
  display: none;
}

.app {
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Container */
.container {
  max-width: 1140px;
  padding: 1rem;
  margin: 1rem auto;
}

/* Grid (Bootstrap like) */
.row {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .row.cols-2 { grid-template-columns: repeat(2,1fr); }
  .row.cols-3 { grid-template-columns: repeat(3,1fr); }
  .row.cols-4 { grid-template-columns: repeat(4,1fr); }
}

/* Navbar */
.navbar {
  background: var(--surface);
  border-bottom: 1px solid var(--outline);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-inner.container {
  margin: auto;
}

.brand {
  font-weight: 600;
  font-size: 1.25rem;
}

.brand span {
  color: var(--accent);
}

/* Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: .5rem;
  cursor: pointer;
}

.theme-toggle::after {
  /* Default Dark Theme enabled */
  content: 'Dark';
  display: block;
}

#theme-switcher:checked ~ .app .theme-toggle::after {
  /* Switch back to light */
  content: 'Light';
}

.toggle-track {
  width: 46px;
  height: 24px;
  border-radius: 999px;
  position: relative;
  border: 1px solid var(--outline);
  transition: var(--transition);
  /* Default Dark Theme enabled */
  background: var(--accent);
}

#theme-switcher:checked ~ .app .toggle-track {
  /* Switch back to light */
  background: var(--surface-variant);
}

.toggle-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: transform .25s ease;
  /* Default Dark Theme enabled */
  transform: translateX(22px);
  background: var(--on-accent);
}

#theme-switcher:checked ~ .app .toggle-thumb {
  /* Switch back to light */
  transform: translateX(0);
  background: var(--surface-elevated);
}

/* Hero */
.hero {
  background: var(--surface-variant);
  padding: 3rem 2rem;
}

.hero h1 {
  font-size: clamp(2rem,4vw,3rem);
  margin-bottom: 1rem;
}

.hero p {
  max-width: 600px;
  color: var(--text-secondary);
}

.hero .container {
  margin: auto;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: .75rem;
  cursor: pointer;
  padding: 1.5rem;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--shadow);
  background: var(--accent);
  color: var(--on-accent)
}

.card i {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: .75rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: .5rem 1.25rem;
  border-radius: .375rem;
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

@media (min-width: 576px) {
  .btn {
    font-size: 1rem;
    width: auto;
  }
  
}

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-outline {
  background: var(--surface-variant);
  border-color: var(--outline);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: var(--surface-elevated);
}

.btn-container {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 576px) {
  .btn-container {
    flex-direction: row;
  }
}

/* Table */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--outline);
  border-radius: .75rem;
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background: var(--accent);
  font-weight: 700;
}

th, td {
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--outline);
  text-align: left;
}

th {
  color: var(--text-secondary);
  font-weight: 500;
}

thead th {
  color: var(--on-accent);
}

/* Features */
.feature-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem;
  background: var(--surface-variant);
  border: 1px solid var(--outline);
  border-radius: 10px;
  cursor: pointer;
  transition: var(--transition);
}

.feature-item:hover {
  transform: scale(1.05);
}

.feature-item i {
  background: var(--accent);
  color: var(--on-accent);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
}

.feature-item span {
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.1;
  font-weight: 500;
}

/* Code Block */
.code-block {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 .25rem 1rem var(--shadow);
}

.code-block pre {
  overflow-x: auto;
}

.code-block code {
  font-family: 'Courier New', monospace;
  color: var(--accent);
  font-size: .9rem;
  line-height: 1.5;
}

/* Divider */
.divider {
  width: 100%;
  height: 2px;
  background: var(--outline);
}

/* Footer */
.footer {
  margin-top: 3rem;
  padding: 2rem 1rem;
  border-top: 1px solid var(--outline);
  color: var(--text-secondary);
  text-align: center;
}

.footer .hint {
  font-size: .9rem;
  margin-top: .5rem;
  opacity: .8;
}

/* Semantic elements */
h2 {
  margin-bottom: 1rem;
}