/* ============================================================
   EncodingBench — Style System
   Purple/violet accent (#a78bfa) · Dark theme
   ============================================================ */

:root {
  --bg: #0b0f14;
  --text: #d7fbe8;
  --text-muted: rgba(214, 255, 233, 0.7);
  --text-dim: rgba(214, 255, 233, 0.5);
  --accent: #a78bfa;
  --accent-glow: rgba(167, 139, 250, 0.35);
  --accent-dim: rgba(167, 139, 250, 0.15);
  --site-accent: #7cf7c0;
  --border: rgba(167, 139, 250, 0.15);
  --border-hover: rgba(167, 139, 250, 0.35);
  --site-border: rgba(117, 255, 171, 0.2);
  --card-bg: rgba(15, 23, 34, 0.7);
  --card-hover: rgba(20, 30, 45, 0.85);
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-sm: 8px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at top, #0f1722, #0b0f14 45%, #06080b);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-glow); }

/* ---- Site Nav ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--site-border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--site-accent);
  text-decoration: none;
}
.nav-logo span { letter-spacing: 0.5px; }

.nav-links {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
}
.nav-link:hover { color: var(--text); background: rgba(124, 247, 192, 0.08); }
.nav-link.active {
  color: var(--accent);
  background: var(--accent-dim);
  font-weight: 600;
}

.nav-hamburger {
  display: none;
  background: none;
  border: 1px solid var(--site-border);
  color: var(--text);
  font-size: 1.3rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}

/* ---- Terminal Hero ---- */
.terminal-window {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
  box-shadow: 0 0 40px rgba(167, 139, 250, 0.08);
  margin-left: 1rem;
  margin-right: 1rem;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  background: rgba(6, 8, 11, 0.8);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  display: inline-block;
}
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.terminal-title {
  margin-left: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.hero-body {
  padding: 2.5rem 2rem;
  text-align: center;
}

.hero-body h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.hero-body h1 .accent {
  color: var(--accent);
  text-shadow: 0 0 30px var(--accent-glow), 0 0 60px rgba(167, 139, 250, 0.15);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.hero-stat {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.35rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* ---- Main Container ---- */
.main-container {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 1rem;
  align-items: start;
}

/* ---- Panels ---- */
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.result-count {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ---- Input Panel ---- */
.input-panel {
  position: sticky;
  top: 70px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  backdrop-filter: blur(8px);
}

.input-controls {
  display: flex;
  gap: 0.4rem;
}

.btn {
  border: 1px solid var(--border);
  background: rgba(167, 139, 250, 0.06);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-family: var(--font-sans);
  font-weight: 500;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn:hover {
  background: var(--accent-dim);
  color: var(--text);
  border-color: var(--border-hover);
}

.btn-detect {
  color: var(--accent);
  border-color: var(--accent-dim);
}
.btn-detect:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 12px var(--accent-glow);
}

.textarea-wrap {
  margin-top: 0.75rem;
}

.input-textarea {
  width: 100%;
  min-height: 200px;
  max-height: 500px;
  resize: vertical;
  background: rgba(6, 8, 11, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  outline: none;
  transition: border-color 0.2s;
}
.input-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.input-textarea::placeholder {
  color: var(--text-dim);
}

.input-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.detect-badges {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-left: auto;
}

.detect-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 10px;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--border-hover);
  animation: badge-pulse 2s ease-in-out infinite;
}

@keyframes badge-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 12px 2px var(--accent-glow); }
}

/* Mode Toggle */
.mode-toggle {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.mode-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.mode-label:has(input:checked) {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: var(--border-hover);
}
.mode-label input { display: none; }

/* Category Filters */
.category-filters {
  margin-top: 1rem;
}

.filter-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: block;
  margin-bottom: 0.4rem;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.filter-btn {
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--border-hover);
}
.filter-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-muted);
}

/* Search */
.search-bar { margin-top: 0.75rem; }

.search-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: rgba(6, 8, 11, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}
.search-input::placeholder { color: var(--text-dim); }

/* ---- Output Panel ---- */
.output-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.category-header {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  padding: 0.75rem 0 0.25rem;
  border-bottom: 1px solid var(--border);
  margin-top: 0.5rem;
}
.category-header:first-child { margin-top: 0; }

.encoding-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  backdrop-filter: blur(6px);
  transition: all 0.25s ease;
  opacity: 0;
  transform: translateY(8px);
  animation: card-enter 0.35s ease forwards;
}

.encoding-card:hover {
  background: var(--card-hover);
  border-color: var(--border-hover);
  box-shadow: 0 4px 20px rgba(167, 139, 250, 0.08);
}

/* Category-specific accent colors */
.encoding-card[data-category="Text Encodings"]     { border-left-color: #a78bfa; }
.encoding-card[data-category="Cipher/Transform"]    { border-left-color: #f472b6; }
.encoding-card[data-category="Number Systems"]      { border-left-color: #60a5fa; }
.encoding-card[data-category="Hashing"]             { border-left-color: #fb923c; }
.encoding-card[data-category="Security-Specific"]   { border-left-color: #f87171; }
.encoding-card[data-category="Misc"]                { border-left-color: #34d399; }

@keyframes card-enter {
  to { opacity: 1; transform: translateY(0); }
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.card-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.card-category {
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-desc {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.card-result-wrap {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.card-result {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--site-accent);
  background: rgba(6, 8, 11, 0.5);
  padding: 0.5rem 0.65rem;
  border-radius: 6px;
  border: 1px solid rgba(167, 139, 250, 0.08);
  word-break: break-all;
  max-height: 80px;
  overflow: hidden;
  position: relative;
  cursor: text;
  line-height: 1.4;
  transition: max-height 0.3s ease;
}
.card-result.expanded {
  max-height: 400px;
  overflow-y: auto;
}
.card-result.computing {
  color: var(--text-dim);
  font-style: italic;
}
.card-result.error {
  color: #f87171;
}

.card-result .expand-hint {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 24px;
  background: linear-gradient(transparent, rgba(6, 8, 11, 0.9));
  display: flex;
  align-items: flex-end;
  justify-content: center;
  font-size: 0.65rem;
  color: var(--accent);
  cursor: pointer;
  padding-bottom: 2px;
}

.copy-btn {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--accent);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
}
.copy-btn.copied {
  background: rgba(40, 200, 64, 0.2);
  border-color: #28c840;
  color: #28c840;
}

/* ---- Conversion Chain ---- */
.chain-section {
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.chain-container {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
}

.chain-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.chain-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.chain-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

.chain-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.chain-step {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  position: relative;
}
.chain-step::after {
  content: '→';
  color: var(--accent);
  font-weight: 700;
  margin-left: 0.25rem;
}
.chain-step:last-child::after { content: ''; }

.chain-select, .chain-dir {
  padding: 0.45rem 0.65rem;
  background: rgba(6, 8, 11, 0.6);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  outline: none;
  cursor: pointer;
}
.chain-select:focus, .chain-dir:focus {
  border-color: var(--accent);
}
.chain-select option, .chain-dir option {
  background: #0b0f14;
  color: var(--text);
}

.btn-add-step {
  color: var(--accent);
}

.chain-result {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--site-accent);
  background: rgba(6, 8, 11, 0.5);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  min-height: 2.5rem;
  word-break: break-all;
  display: none;
}
.chain-result.visible { display: block; }

/* ---- Footer ---- */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--site-border);
  font-size: 0.85rem;
  color: var(--text-dim);
}
.footer a {
  color: var(--site-accent);
  text-decoration: none;
}
.footer a:hover { text-decoration: underline; }

/* ---- Empty State ---- */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-dim);
}
.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}
.empty-state p {
  font-size: 0.9rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: rgba(11, 15, 20, 0.97);
    padding: 0.5rem;
    border-bottom: 1px solid var(--site-border);
    gap: 0.2rem;
  }
  .nav-hamburger { display: block; }

  .main-container {
    grid-template-columns: 1fr;
  }

  .input-panel {
    position: static;
  }

  .hero-body h1 { font-size: 2rem; }
  .hero-body { padding: 1.5rem 1rem; }

  .chain-controls { flex-direction: column; align-items: stretch; }
  .chain-steps { flex-direction: column; }
  .chain-step::after { content: '↓'; display: block; text-align: center; }
}

@media (max-width: 480px) {
  .input-controls { flex-wrap: wrap; }
  .panel-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

/* ---- Animations ---- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in { animation: fadeIn 0.4s ease; }

/* Staggered delays (set via JS inline style) */