/* Global Styles for RocketHour Challenges */
/* A sleek, modern dark theme for teenage coders */

:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #161616;
  --bg-card: #1a1a1a;
  --bg-hover: #222222;

  --text-primary: #f0f0f0;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;

  --accent: #00d4aa;
  --accent-hover: #00f5c4;
  --accent-glow: rgba(0, 212, 170, 0.15);

  --border: #2a2a2a;
  --border-light: #333333;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  padding: 2rem;
  background-image:
    radial-gradient(ellipse at top, rgba(0, 212, 170, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(100, 100, 100, 0.03) 0%, transparent 50%);
}

/* Typography */
h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text-primary);
  line-height: 1.2;
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  max-width: 65ch;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Buttons */
button {
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--accent);
  color: var(--bg-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.5rem 0;
  position: relative;
  overflow: hidden;
}

button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition);
}

button:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 170, 0.25);
}

button:hover::before {
  opacity: 1;
}

button:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(0, 212, 170, 0.2);
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Secondary button style (add class="secondary" to use) */
button.secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

button.secondary:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* Cards / Divs */
div[id] {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1rem 0;
  transition: all var(--transition-slow);
}

div[id]:hover {
  border-color: var(--border-light);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* Inputs */
input[type="text"],
input[type="number"],
input[type="email"],
textarea {
  font-family: var(--font-main);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  width: 100%;
  max-width: 400px;
  transition: all var(--transition);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

/* Select */
select {
  font-family: var(--font-main);
  font-size: 1rem;
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a0a0a0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  transition: all var(--transition);
}

select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Labels */
label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

/* Lists */
ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5rem;
}

li::marker {
  color: var(--accent);
}

/* Code elements */
code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-secondary);
  padding: 0.2em 0.5em;
  border-radius: var(--radius-sm);
  color: var(--accent);
}

pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  background: none;
  padding: 0;
}

/* Horizontal rule */
hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2rem 0;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

td {
  color: var(--text-secondary);
}

tr:hover td {
  background: var(--bg-hover);
}

/* Utility classes */
.container {
  max-width: 800px;
  margin: 0 auto;
}

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

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* Selection styling */
::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

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

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

/* Responsive adjustments */
@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  div[id] {
    padding: 1rem;
  }

  button {
    width: 100%;
    justify-content: center;
  }
}

/* Print styles */
@media print {
  body {
    background: white;
    color: black;
  }

  button {
    background: #333;
  }
}