@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Light Mode Palette */
  --bg-app: #f9fafb; /* zinc-50 */
  --bg-card: #ffffff;
  --text-primary: #09090b; /* zinc-950 */
  --text-secondary: #52525b; /* zinc-600 */
  --text-muted: #71717a; /* zinc-500 */
  --border-color: #e4e4e7; /* zinc-200 */
  --primary-color: #4f46e5; /* indigo-600 */
  --primary-hover: #4338ca; /* indigo-700 */
  --primary-muted: rgba(79, 70, 229, 0.08);
  --badge-bg: #f4f4f5; /* zinc-100 */
  --badge-border: #e4e4e7;
  --code-bg: #f4f4f5;
  --code-text: #4f46e5;
  --radius-lg: 1rem;
  --radius-md: 0.5rem;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.dark {
  /* Dark Mode Palette */
  --bg-app: #09090b; /* zinc-950 */
  --bg-card: #18181b; /* zinc-900 */
  --text-primary: #f4f4f5; /* zinc-100 */
  --text-secondary: #a1a1aa; /* zinc-400 */
  --text-muted: #71717a; /* zinc-500 */
  --border-color: #27272a; /* zinc-800 */
  --primary-color: #818cf8; /* indigo-400 */
  --primary-hover: #6366f1; /* indigo-500 */
  --primary-muted: rgba(129, 140, 248, 0.1);
  --badge-bg: #18181b;
  --badge-border: #27272a;
  --code-bg: #09090b;
  --code-text: #818cf8;
}

/* ─────────────────────────────────────────────
   GLOBAL STYLES
   ───────────────────────────────────────────── */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* iOS Safari improvements */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: env(safe-area-inset-bottom);
}

/* ─────────────────────────────────────────────
   LAYOUT CONTAINERS
   ───────────────────────────────────────────── */
.core-navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color 0.3s, border-color 0.3s;
}

.dark .core-navbar {
  background-color: rgba(9, 9, 11, 0.8);
}

.core-navbar-container {
  display: flex;
  height: 4rem;
  max-width: 80rem;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .core-navbar-container {
    padding: 0 1.5rem;
  }
}

@media (min-width: 1024px) {
  .core-navbar-container {
    padding: 0 2rem;
  }
}

.core-main {
  flex-grow: 1;
  width: 100%;
  max-width: 56rem; /* max-w-4xl */
  margin: 0 auto;
  padding: 3rem 1rem;
}

@media (min-width: 640px) {
  .core-main {
    padding: 3rem 1.5rem;
  }
}

@media (min-width: 1024px) {
  .core-main {
    padding: 3rem 2rem;
  }
}

.core-content-stack {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* ─────────────────────────────────────────────
   COMPONENTS & TYPOGRAPHY
   ───────────────────────────────────────────── */
.core-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--primary-color);
  transition: opacity 0.2s;
}

.core-logo:hover {
  opacity: 0.85;
}

.core-logo svg {
  height: 1.5rem;
  width: 1.5rem;
  stroke: currentColor;
}

.core-controls-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.core-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--badge-bg);
  border: 1px solid var(--badge-border);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-md);
}

.core-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  padding: 0.5rem 0.75rem;
  height: 2.25rem;
  min-width: 2.75rem;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.core-btn:hover {
  background-color: var(--badge-bg);
  color: var(--text-primary);
}

.core-btn svg {
  height: 1.2rem;
  width: 1.2rem;
  stroke: currentColor;
}

/* Typography */
.core-header-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.core-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 2.25rem;
  /* Premium gradient text */
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 640px) {
  .core-title {
    font-size: 2.25rem;
    line-height: 2.5rem;
  }
}

.core-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.25rem;
}

/* Card / Box element */
.core-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s, background-color 0.3s, border-color 0.3s;
}

@media (min-width: 640px) {
  .core-card {
    padding: 2rem;
  }
}

.core-card:hover {
  box-shadow: var(--shadow-md);
}

.core-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.core-card-body {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5rem;
}

.core-card-body p {
  margin-bottom: 0.75rem;
}

.core-card-body p:last-child {
  margin-bottom: 0;
}

.core-list {
  list-style-type: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.core-list li {
  position: relative;
  padding-left: 1.25rem;
}

.core-list li::before {
  content: "•";
  position: absolute;
  left: 0.25rem;
  color: var(--primary-color);
  font-weight: bold;
}

.core-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--code-text);
  background-color: var(--code-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
}

.core-warning {
  margin-top: 0.75rem;
  color: #b45309; /* amber-700 */
  font-weight: 500;
}

.dark .core-warning {
  color: #fbbf24; /* amber-400 */
}

/* ─────────────────────────────────────────────
   SHARED FOOTER STYLES
   ───────────────────────────────────────────── */
.shared-footer {
  flex-shrink: 0;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 1.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: background-color 0.3s, border-color 0.3s, color 0.3s;
  width: 100%;
}

.shared-footer .footer-content {
  max-width: 80rem;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-sizing: border-box;
}

@media (max-width: 640px) {
  .shared-footer .footer-content {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
}

.shared-footer .footer-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

.shared-footer .footer-link:hover {
  text-decoration: underline;
  color: var(--primary-hover);
}

.shared-footer .footer-right-link {
  color: var(--text-muted);
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
}

.shared-footer .footer-right-link:hover {
  color: var(--primary-color);
}

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

.animate-fade-in-up {
  animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}