/* Global theme and layout - Mobile First */
:root {
  /* Core palette */
  --bg: #0b0f1a; /* deep space */
  --bg-elevated: rgba(17, 23, 40, 0.65);
  --surface: rgba(255, 255, 255, 0.06);
  --text: #e6f1ff;
  --muted: #9fb3c8;

  /* Accents: subtle homage to mempool.space and Bitcoin orange */
  --mempool-cyan: #00e0ff;
  --mempool-blue: #2dd4ff;
  --mempool-green: #20c997;
  --btc-orange: #F7931A;

  /* Effects */
  --ring: rgba(0, 224, 255, 0.35);
  --glow: 0 10px 40px rgba(0, 224, 255, 0.25);
  --glass: blur(10px) saturate(120%);

  /* Controls */
  --control-bg: rgba(255, 255, 255, 0.08);
  --control-border: rgba(255, 255, 255, 0.18);
  --control-focus: rgba(0, 224, 255, 0.5);

  /* Buttons */
  --btn-grad-from: #0ea5e9;
  --btn-grad-to: #22d3ee;
  --btn-hover-from: #0891b2;
  --btn-hover-to: #06b6d4;
  --btn-shadow: 0 10px 30px rgba(34, 211, 238, 0.25);

  /* Success / error */
  --success: #22c55e;
  --error: #ef4444;

  /* Mobile-first spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Mobile-first typography */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body, #app {
  height: 100%;
}

html {
  /* Prevent horizontal scrolling on mobile */
  overflow-x: hidden;
  /* Improve touch scrolling on iOS */
  -webkit-overflow-scrolling: touch;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(800px 400px at 10% 5%, rgba(45, 212, 255, 0.08), transparent 60%),
    radial-gradient(600px 300px at 90% 10%, rgba(32, 201, 151, 0.06), transparent 55%),
    radial-gradient(700px 400px at 50% 90%, rgba(247, 147, 26, 0.05), transparent 60%),
    linear-gradient(180deg, #070a12, #0b0f1a);
  background-attachment: scroll; /* Better for mobile */
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Prevent horizontal scrolling on mobile */
  overflow-x: hidden;
  /* Improve touch interactions */
  -webkit-tap-highlight-color: transparent;
}

/* Tablet and up */
@media (min-width: 768px) {
  body {
    background:
      radial-gradient(1200px 600px at 10% 5%, rgba(45, 212, 255, 0.08), transparent 60%),
      radial-gradient(900px 500px at 90% 10%, rgba(32, 201, 151, 0.06), transparent 55%),
      radial-gradient(1000px 700px at 50% 90%, rgba(247, 147, 26, 0.05), transparent 60%),
      linear-gradient(180deg, #070a12, #0b0f1a);
    background-attachment: fixed;
  }
}

.app-shell {
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

/* Mobile-first container */
.container {
  width: 100%;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
  margin-inline: auto;
}

/* Tablet and up */
@media (min-width: 768px) {
  .container {
    width: min(1100px, 92vw);
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }
}

/* Focus styles - Enhanced for mobile */
:focus-visible {
  outline: 2px solid var(--mempool-cyan);
  outline-offset: 3px;
  border-radius: 10px;
}

/* Improve touch targets on mobile */
@media (hover: none) and (pointer: coarse) {
  button, 
  [role="button"], 
  input[type="submit"], 
  input[type="button"], 
  .btn {
    min-height: 44px;
    min-width: 44px;
  }
}

/* Links */
a {
  color: var(--mempool-cyan);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Button styles - Mobile first */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: 8px;
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px; /* Touch-friendly minimum */
  min-width: 44px;
}

@media (min-width: 768px) {
  .btn {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--text-base);
    min-height: auto;
  }
}

.btn-primary {
  background: linear-gradient(135deg, var(--btn-grad-from), var(--btn-grad-to));
  color: white;
  box-shadow: var(--btn-shadow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--btn-hover-from), var(--btn-hover-to));
  transform: translateY(-1px);
  box-shadow: 0 15px 40px rgba(34, 211, 238, 0.35);
}

/* Modal styles - Mobile first */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-sm);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

@media (min-width: 768px) {
  .modal-overlay {
    align-items: center;
    padding: var(--spacing-xl);
  }
}

.modal-content {
  background: var(--bg-elevated);
  backdrop-filter: var(--glass);
  border: 1px solid var(--control-border);
  border-radius: 16px;
  width: 100%;
  max-width: 600px;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  margin-top: var(--spacing-sm);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  /* Prevent content from being cut off on small screens */
  min-height: 0;
}

@media (min-width: 768px) {
  .modal-content {
    margin-top: 0;
    max-height: 80vh;
  }
}

/* Ensure modal content is accessible on very small screens */
@media (max-height: 600px) {
  .modal-content {
    max-height: 98vh;
    margin-top: 1vh;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-md);
  border-bottom: 1px solid var(--control-border);
}

@media (min-width: 768px) {
  .modal-header {
    padding: var(--spacing-xl) var(--spacing-xl);
  }
}

.modal-header h2 {
  margin: 0;
  font-size: var(--text-lg);
  color: var(--text);
}

@media (min-width: 768px) {
  .modal-header h2 {
    font-size: var(--text-xl);
  }
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: var(--text-xl);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: 4px;
  transition: all 0.2s ease;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close-btn:hover {
  background: var(--control-bg);
  color: var(--text);
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  /* Smooth scrolling on mobile */
  -webkit-overflow-scrolling: touch;
  /* Ensure content doesn't get cut off */
  min-height: 0;
}

@media (min-width: 768px) {
  .modal-body {
    padding: var(--spacing-xl);
  }
}

/* Landscape mobile optimization */
@media (max-height: 500px) and (orientation: landscape) {
  .modal-content {
    max-height: 95vh;
  }
  
  .modal-header {
    padding: var(--spacing-md) var(--spacing-md);
  }
  
  .modal-body {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .modal-footer {
    padding: var(--spacing-md);
  }
}

.disclaimer-content {
  line-height: 1.7;
}

.disclaimer-content h3 {
  color: var(--mempool-cyan);
  font-size: var(--text-base);
  margin: var(--spacing-xl) 0 var(--spacing-md) 0;
}

@media (min-width: 768px) {
  .disclaimer-content h3 {
    font-size: var(--text-lg);
  }
}

.disclaimer-content p {
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--muted);
  font-size: var(--text-sm);
}

@media (min-width: 768px) {
  .disclaimer-content p {
    font-size: var(--text-base);
  }
}

.modal-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--control-border);
  display: flex;
  justify-content: center;
}

@media (min-width: 768px) {
  .modal-footer {
    padding: var(--spacing-xl);
  }
}

/* Disclaimer link button styling - Enhanced for mobile */
.disclaimer-link {
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  color: var(--mempool-cyan);
  text-decoration: none;
  cursor: pointer;
  font-size: var(--text-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: 12px;
  transition: all 0.2s ease;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  text-align: center;
  /* Better touch feedback */
  -webkit-tap-highlight-color: rgba(0, 224, 255, 0.1);
}

@media (min-width: 768px) {
  .disclaimer-link {
    font-size: var(--text-base);
    padding: var(--spacing-sm) var(--spacing-lg);
  }
}

.disclaimer-link:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--mempool-cyan);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 224, 255, 0.15);
}

.disclaimer-link:active {
  transform: translateY(0);
}