/* ==========================================================================
   Text Cleanr — 3K Digital
   styles.css
   Design direction: Dark luxury editorial — deep charcoal, acid-green accent,
   DM Mono precision meets Fraunces editorial warmth.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette */
  --clr-bg:           #0e0f11;
  --clr-surface:      #141618;
  --clr-surface-2:    #1c1e21;
  --clr-surface-3:    #232629;
  --clr-border:       rgba(255, 255, 255, 0.07);
  --clr-border-hover: rgba(255, 255, 255, 0.14);

  --clr-accent:       #a8ff47;   /* acid green */
  --clr-accent-dim:   rgba(168, 255, 71, 0.12);
  --clr-accent-glow:  rgba(168, 255, 71, 0.35);

  --clr-text-primary:   #e8e9eb;
  --clr-text-secondary: #7a7d84;
  --clr-text-muted:     #4a4d54;

  /* Typography */
  --font-mono:    'DM Mono', 'Courier New', monospace;
  --font-display: 'Fraunces', Georgia, serif;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Shadows */
  --shadow-card: 0 0 0 1px var(--clr-border), 0 24px 48px rgba(0, 0, 0, 0.6);
  --shadow-btn:  0 4px 20px rgba(168, 255, 71, 0.25);

  /* Transitions */
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:    150ms;
  --dur-med:     280ms;
  --dur-slow:    450ms;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--clr-bg);
  color: var(--clr-text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Focused accessibility */
:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

a {
  color: var(--clr-accent);
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease-smooth);
}
a:hover { opacity: 0.75; }

/* --------------------------------------------------------------------------
   3. Background Decoration — Noise & Grid
   -------------------------------------------------------------------------- */

/* Subtle noise texture using SVG filter */
.bg-noise {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* Faint grid lines */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--clr-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--clr-border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 20%, black 30%, transparent 100%);
}

/* All content sits above decorations */
body > *:not(.bg-noise):not(.bg-grid) {
  position: relative;
  z-index: 1;
}

/* --------------------------------------------------------------------------
   4. Site Header
   -------------------------------------------------------------------------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--clr-border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--clr-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color var(--dur-fast) var(--ease-smooth);
}
.back-link:hover { color: var(--clr-text-primary); opacity: 1; }

.back-arrow {
  display: inline-block;
  transition: transform var(--dur-fast) var(--ease-smooth);
}
.back-link:hover .back-arrow { transform: translateX(-4px); }

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border: 1px solid rgba(168, 255, 71, 0.25);
  border-radius: 4px;
  padding: 3px 8px;
}

/* --------------------------------------------------------------------------
   5. Main Wrapper & Layout
   -------------------------------------------------------------------------- */
.main-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl) var(--space-3xl);
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  text-align: center;
  margin-bottom: var(--space-2xl);
  animation: fadeUp var(--dur-slow) var(--ease-smooth) both;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.688rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-accent);
  box-shadow: 0 0 8px var(--clr-accent-glow);
  animation: pulse 2.5s ease-in-out infinite;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--clr-text-primary);
  margin-bottom: var(--space-md);
}

.hero-title em {
  font-style: italic;
  font-weight: 300;
  color: var(--clr-accent);
}

.hero-sub {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--clr-text-secondary);
  letter-spacing: 0.04em;
}

/* --------------------------------------------------------------------------
   7. Tool Card
   -------------------------------------------------------------------------- */
.tool-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto auto auto;
  animation: fadeUp var(--dur-slow) var(--ease-smooth) 100ms both;
}

/* --------------------------------------------------------------------------
   8. Panels (Input / Output)
   -------------------------------------------------------------------------- */
.panel {
  border-bottom: 1px solid var(--clr-border);
}

.panel--output {
  border-bottom: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--clr-border);
  background: var(--clr-surface-2);
}

.panel-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--clr-text-muted);
  cursor: default;
}

.char-count {
  font-family: var(--font-mono);
  font-size: 0.688rem;
  color: var(--clr-text-muted);
  transition: color var(--dur-fast) var(--ease-smooth);
}

.char-count.has-content {
  color: var(--clr-text-secondary);
}

/* ── Textarea ── */
.text-area {
  display: block;
  width: 100%;
  min-height: 200px;
  padding: var(--space-lg);
  background: transparent;
  border: none;
  color: var(--clr-text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.75;
  resize: vertical;
  transition: background var(--dur-fast) var(--ease-smooth);
}

.text-area:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.015);
}

.text-area::placeholder {
  color: var(--clr-text-muted);
  font-style: italic;
}

.text-area--output {
  color: var(--clr-accent);
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease-smooth);
}

.text-area--output.has-content {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   9. Controls Section
   -------------------------------------------------------------------------- */
.controls-section {
  padding: var(--space-xl) var(--space-lg);
  background: var(--clr-surface-2);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.controls-heading {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

/* ── Toggle Items ── */
.toggle-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    border-color var(--dur-fast) var(--ease-smooth),
    background var(--dur-fast) var(--ease-smooth),
    transform var(--dur-fast) var(--ease-spring);
}

.toggle-item:hover {
  border-color: var(--clr-border-hover);
  background: var(--clr-surface-3);
  transform: translateY(-1px);
}

.toggle-item:active {
  transform: translateY(0);
}

/* Hide native checkbox */
.toggle-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* Custom toggle track */
.toggle-track {
  flex-shrink: 0;
  position: relative;
  width: 36px;
  height: 20px;
  background: var(--clr-surface-3);
  border: 1px solid var(--clr-border-hover);
  border-radius: 999px;
  margin-top: 2px;
  transition: background var(--dur-med) var(--ease-smooth), border-color var(--dur-med) var(--ease-smooth);
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-text-muted);
  transition:
    transform var(--dur-med) var(--ease-spring),
    background var(--dur-med) var(--ease-smooth);
}

/* Checked state */
.toggle-input:checked + .toggle-track {
  background: var(--clr-accent-dim);
  border-color: rgba(168, 255, 71, 0.4);
}

.toggle-input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: var(--clr-accent);
}

.toggle-item:has(.toggle-input:checked) {
  border-color: rgba(168, 255, 71, 0.2);
  background: rgba(168, 255, 71, 0.04);
}

/* Toggle label text */
.toggle-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toggle-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--clr-text-primary);
  line-height: 1.3;
}

.toggle-desc {
  font-family: var(--font-mono);
  font-size: 0.688rem;
  color: var(--clr-text-muted);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   10. Clean Button
   -------------------------------------------------------------------------- */
.clean-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  background: var(--clr-accent);
  color: #0e0f11;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  overflow: hidden;
  transition:
    transform var(--dur-fast) var(--ease-spring),
    box-shadow var(--dur-fast) var(--ease-smooth),
    opacity var(--dur-fast) var(--ease-smooth);
}

.clean-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn);
}

.clean-btn:active {
  transform: translateY(0) scale(0.98);
}

/* Glow sweep animation */
.btn-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    transparent 35%,
    rgba(255, 255, 255, 0.25) 50%,
    transparent 65%
  );
  transform: translateX(-100%);
  transition: none;
}

.clean-btn:hover .btn-glow {
  animation: shimmer 0.6s var(--ease-smooth) forwards;
}

/* Processing state */
.clean-btn.is-processing {
  pointer-events: none;
  opacity: 0.7;
}

.btn-spinner {
  display: none;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(14, 15, 17, 0.3);
  border-top-color: #0e0f11;
  border-radius: 50%;
}

.clean-btn.is-processing .btn-text { opacity: 0.5; }
.clean-btn.is-processing .btn-spinner {
  display: block;
  animation: spin 0.7s linear infinite;
}

/* --------------------------------------------------------------------------
   11. Output Actions & Copy Button
   -------------------------------------------------------------------------- */
.output-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 5px 12px;
  background: transparent;
  border: 1px solid var(--clr-border-hover);
  border-radius: var(--radius-sm);
  color: var(--clr-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.688rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition:
    border-color var(--dur-fast) var(--ease-smooth),
    color var(--dur-fast) var(--ease-smooth),
    background var(--dur-fast) var(--ease-smooth),
    transform var(--dur-fast) var(--ease-spring);
}

.copy-btn:hover:not(:disabled) {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  transform: translateY(-1px);
}

.copy-btn:active:not(:disabled) {
  transform: scale(0.97);
}

.copy-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.copy-btn.copied {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}

.copy-icon {
  font-size: 0.9em;
}

/* --------------------------------------------------------------------------
   12. Info / SEO Section
   -------------------------------------------------------------------------- */
.info-section {
  margin-top: var(--space-3xl);
  animation: fadeUp var(--dur-slow) var(--ease-smooth) 200ms both;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.info-card {
  padding: var(--space-xl) var(--space-lg);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition:
    border-color var(--dur-fast) var(--ease-smooth),
    transform var(--dur-fast) var(--ease-smooth);
}

.info-card:hover {
  border-color: var(--clr-border-hover);
  transform: translateY(-2px);
}

.info-card__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.info-card__body {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--clr-text-secondary);
  line-height: 1.8;
}

.info-card__body strong {
  color: var(--clr-text-primary);
  font-weight: 500;
}

.info-card__list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.info-card__list li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--clr-text-secondary);
  padding-left: var(--space-md);
  position: relative;
  line-height: 1.6;
}

.info-card__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--clr-accent);
  font-size: 0.75rem;
}

/* --------------------------------------------------------------------------
   13. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--clr-border);
  font-family: var(--font-mono);
  font-size: 0.688rem;
  color: var(--clr-text-muted);
  margin-top: var(--space-3xl);
}

.footer-link {
  color: var(--clr-text-secondary);
}

.footer-tag {
  letter-spacing: 0.06em;
  font-style: italic;
}

/* --------------------------------------------------------------------------
   14. Keyframe Animations
   -------------------------------------------------------------------------- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 6px var(--clr-accent-glow); opacity: 1; }
  50%       { box-shadow: 0 0 16px var(--clr-accent-glow); opacity: 0.7; }
}

@keyframes shimmer {
  to { transform: translateX(200%); }
}

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

/* --------------------------------------------------------------------------
   15. Responsive — Tablet
   -------------------------------------------------------------------------- */
@media (max-width: 720px) {
  .main-wrapper {
    padding: var(--space-xl) var(--space-md) var(--space-2xl);
  }

  .site-header {
    padding: var(--space-md);
  }

  .site-footer {
    padding: var(--space-md);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   16. Responsive — Mobile
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .controls-section {
    padding: var(--space-lg) var(--space-md);
  }

  .panel-header {
    padding: var(--space-sm) var(--space-md);
  }

  .text-area {
    padding: var(--space-md);
    min-height: 150px;
    font-size: 0.8rem;
  }

  .output-actions {
    gap: var(--space-sm);
  }
}