/* ASCII Art Generator - Main Stylesheet */
/* Following brandbook.md guidelines */

/* ========================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ======================================== */

:root {
  /* Primary Colors */
  --color-primary: #00ff41;
  --color-primary-dim: #00cc34;
  --color-primary-glow: rgba(0, 255, 65, 0.3);

  /* Background Colors */
  --color-bg-dark: #0a0e27;
  --color-bg-medium: #141b3a;
  --color-bg-light: #1e2749;
  --color-bg-elevated: #252d52;

  /* Text Colors */
  --color-text-primary: #e0e0e0;
  --color-text-secondary: #a0a0a0;
  --color-text-muted: #666666;
  --color-text-terminal: #00ff41;

  /* Semantic Colors */
  --color-success: #00ff41;
  --color-error: #ff4444;
  --color-warning: #ffaa00;
  --color-info: #00aaff;

  /* Typography */
  --font-display: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier New', 'Courier', monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;

  /* Transitions */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 500ms;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);

  /* Breakpoints (for JS usage) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
}


/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

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

body {
  background: var(--color-bg-dark);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  min-height: 100vh;
}


/* ========================================
   LAYOUT
   ======================================== */

.container {
  margin: 0 auto;
  max-width: 1200px;
  padding: 0 var(--space-4);
  width: 100%;
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

.main-content {
  padding: var(--space-6) 0;
}

@media (min-width: 768px) {
  .main-content {
    padding: var(--space-10) 0;
  }
}


/* ========================================
   TYPOGRAPHY
   ======================================== */

h1 {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
  text-align: center;
  text-shadow: 0 0 20px var(--color-primary-glow);
}

@media (min-width: 768px) {
  h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-6);
  }
}

.subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-8);
  text-align: center;
}

@media (min-width: 768px) {
  .subtitle {
    font-size: var(--font-size-lg);
  }
}


/* ========================================
   CARDS
   ======================================== */

.card {
  background: var(--color-bg-medium);
  border: 1px solid var(--color-bg-elevated);
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  margin-bottom: var(--space-6);
  padding: var(--space-5);
  transition: border-color var(--transition-normal) var(--transition-ease);
}

@media (min-width: 768px) {
  .card {
    padding: var(--space-6);
  }
}

.card:hover {
  border-color: var(--color-primary-glow);
}


/* ========================================
   FORM ELEMENTS
   ======================================== */

.form-group {
  margin-bottom: var(--space-5);
}

label {
  color: var(--color-text-primary);
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}

textarea,
input[type="text"] {
  background: var(--color-bg-light);
  border: 2px solid var(--color-bg-elevated);
  border-radius: 8px;
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  padding: var(--space-4);
  transition: border-color var(--transition-normal) var(--transition-ease),
              box-shadow var(--transition-normal) var(--transition-ease);
  width: 100%;
}

textarea {
  min-height: 150px;
  resize: vertical;
}

textarea:focus,
input[type="text"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
  outline: none;
}

textarea::placeholder,
input[type="text"]::placeholder {
  color: var(--color-text-muted);
  font-style: italic;
}


/* ========================================
   BUTTONS
   ======================================== */

.button {
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
  border: none;
  border-radius: 8px;
  box-shadow: 0 0 20px var(--color-primary-glow);
  color: var(--color-bg-dark);
  cursor: pointer;
  display: inline-flex;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  gap: var(--space-2);
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  transition: all var(--transition-normal) var(--transition-ease);
  width: 100%;
}

@media (min-width: 768px) {
  .button {
    width: auto;
  }
}

.button:hover:not(:disabled) {
  box-shadow: 0 0 30px var(--color-primary-glow);
  transform: translateY(-2px);
}

.button:active:not(:disabled) {
  transform: translateY(0);
}

.button:disabled {
  box-shadow: none;
  cursor: not-allowed;
  opacity: 0.5;
}

.button--secondary {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.button--secondary:hover:not(:disabled) {
  background: var(--color-primary-glow);
}


/* ========================================
   ASCII ART DISPLAY
   ======================================== */

.ascii-output {
  background: var(--color-bg-dark);
  border: 2px solid var(--color-primary);
  border-radius: 8px;
  color: var(--color-text-terminal);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-5);
  max-height: 600px;
  overflow: auto;
  padding: var(--space-5);
  white-space: pre;
}

.ascii-output:empty {
  display: none;
}

/* Preserve inline styles from ANSI-to-HTML conversion */
.ascii-output span {
  /* Allow inline color styles to override default terminal green */
  font-family: inherit;
  line-height: inherit;
  white-space: inherit;
}

/* Ensure nested spans preserve formatting */
.ascii-output * {
  white-space: pre;
}

/* Scrollbar styling for ASCII output */
.ascii-output::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}

.ascii-output::-webkit-scrollbar-track {
  background: var(--color-bg-medium);
  border-radius: 4px;
}

.ascii-output::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 4px;
}

.ascii-output::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dim);
}


/* ========================================
   LOADING STATE
   ======================================== */

.loading-container {
  align-items: center;
  display: none;
  flex-direction: column;
  gap: var(--space-4);
  margin: var(--space-8) 0;
  text-align: center;
}

.loading-container.active {
  display: flex;
}

.spinner {
  animation: spin 1.5s linear infinite;
  border: 4px solid var(--color-bg-elevated);
  border-radius: 50%;
  border-top-color: var(--color-primary);
  height: 48px;
  width: 48px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

.loading-subtext {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}


/* ========================================
   MESSAGES (ERROR/SUCCESS)
   ======================================== */

.message {
  border-radius: 4px;
  display: none;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-5);
  padding: var(--space-4);
}

.message.active {
  display: block;
}

.message--error {
  background: rgba(255, 68, 68, 0.1);
  border-left: 4px solid var(--color-error);
  color: var(--color-error);
}

.message--success {
  background: rgba(0, 255, 65, 0.1);
  border-left: 4px solid var(--color-success);
  color: var(--color-success);
}


/* ========================================
   BUTTON GROUP
   ======================================== */

.button-group {
  align-items: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

@media (min-width: 768px) {
  .button-group {
    flex-direction: row;
  }
}


/* ========================================
   UTILITIES
   ======================================== */

.hidden {
  display: none !important;
}

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

.mt-4 {
  margin-top: var(--space-4);
}

.mt-6 {
  margin-top: var(--space-6);
}


/* ========================================
   FOOTER
   ======================================== */

.footer {
  border-top: 1px solid var(--color-bg-elevated);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--space-10);
  padding: var(--space-6) 0;
  text-align: center;
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-normal) var(--transition-ease);
}

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


/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Skip to main content link for screen readers */
.skip-link {
  background: var(--color-primary);
  color: var(--color-bg-dark);
  left: 50%;
  padding: var(--space-2) var(--space-4);
  position: absolute;
  top: -100px;
  transform: translateX(-50%);
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-2);
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}