/* ==========================================================================
   Design System & Variables
   ========================================================================== */

:root {
  /* Obsidian Gold Theme (Default) */
  --bg-dark: #08080a;
  --bg-card: rgba(18, 18, 22, 0.65);
  --bg-card-solid: #121216;

  --border-color: rgba(209, 178, 128, 0.22);
  --border-focus: rgba(209, 178, 128, 0.25);
  --border-hover: rgba(209, 178, 128, 0.38);

  --text-primary: #f4f4f5;   /* zinc-100 */
  --text-secondary: #d4d4d8; /* zinc-300 */
  --text-muted: #71717a;     /* zinc-500 */

  --accent: #d1b280;         /* Champagne Gold */
  --accent-rgb: 209, 178, 128;
  --accent-hover: #c4a36e;
  --accent-muted: rgba(209, 178, 128, 0.08);
  --accent-gradient: linear-gradient(135deg, #e2d1b8 0%, #d1b280 100%);

  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-subtle: 0 4px 30px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
}

/* Theme Override: Nordic Slate */
body.theme-nordic {
  --bg-dark: #0b0e14;
  --bg-card: rgba(18, 22, 30, 0.65);
  --bg-card-solid: #12161e;

  --border-color: rgba(103, 232, 249, 0.18);
  --border-focus: rgba(103, 232, 249, 0.25);
  --border-hover: rgba(103, 232, 249, 0.32);

  --text-primary: #f8fafc;   /* slate-50 */
  --text-secondary: #cbd5e1; /* slate-300 */
  --text-muted: #64748b;     /* slate-500 */

  --accent: #67e8f9;         /* Nordic Cyan */
  --accent-rgb: 103, 232, 249;
  --accent-hover: #22d3ee;
  --accent-muted: rgba(103, 232, 249, 0.08);
  --accent-gradient: linear-gradient(135deg, #a5f3fc 0%, #67e8f9 100%);
}

/* Theme Override: Forest Moss */
body.theme-forest {
  --bg-dark: #0a0c0a;
  --bg-card: rgba(18, 22, 18, 0.65);
  --bg-card-solid: #121612;

  --border-color: rgba(167, 243, 208, 0.18);
  --border-focus: rgba(167, 243, 208, 0.25);
  --border-hover: rgba(167, 243, 208, 0.32);

  --text-primary: #f2f5f3;   /* soft sage off-white */
  --text-secondary: #c4cbc7; /* muted sage */
  --text-muted: #6c7570;     /* dark sage gray */

  --accent: #a7f3d0;         /* Sage Green */
  --accent-rgb: 167, 243, 208;
  --accent-hover: #6ee7b7;
  --accent-muted: rgba(167, 243, 208, 0.08);
  --accent-gradient: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

/* Custom selection highlight - subtle background glow */
::selection {
  background: rgba(var(--accent-rgb), 0.25);
  color: inherit;
}

::-moz-selection {
  background: rgba(var(--accent-rgb), 0.25);
  color: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition-smooth);
}

a:hover {
  color: var(--accent-hover);
}

/* Make UI elements unselectable so drag-highlighting only targets content */
.theme-switcher,
.date-badge,
.part-of-speech,
.action-buttons,
.action-btn,
.tooltip,
.meta-label,
.origin-label,
.footer-divider,
.pipeline-flow-wrapper,
.hist-date {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.5s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* Ambient glow nodes background */
@keyframes ambient-pulse-1 {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.08;
  }
  50% {
    transform: translate(45px, -35px) scale(1.15);
    opacity: 0.13;
  }
  100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.08;
  }
}

@keyframes ambient-pulse-2 {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.09;
  }
  50% {
    transform: translate(-35px, 45px) scale(1.12);
    opacity: 0.14;
  }
  100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.09;
  }
}

.ambient-glow {
  position: fixed;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  filter: blur(180px);
  pointer-events: none;
  z-index: -1;
  transition: background 0.6s ease;
}

.glow-1 {
  top: -300px;
  left: -100px;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  animation: ambient-pulse-1 20s ease-in-out infinite;
}

.glow-2 {
  bottom: -300px;
  right: -100px;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  animation: ambient-pulse-2 24s ease-in-out infinite;
}

/* ==========================================================================
   Header & Navbar Layout
   ========================================================================== */

.navbar {
  width: 100%;
  height: 72px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(8, 8, 10, 0.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-container {
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.navbar-item-left {
  justify-self: start;
  display: flex;
  align-items: center;
}

.navbar-item-center {
  justify-self: center;
  display: flex;
  align-items: center;
}

.navbar-item-right {
  justify-self: end;
  display: flex;
  align-items: center;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.back-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  box-shadow: 0 0 15px 1px rgba(var(--accent-rgb), 0.2);
  background: var(--accent-muted);
  transform: translateY(-1px);
}

.back-btn svg {
  transition: transform 0.2s ease;
}

.back-btn:hover svg {
  transform: translateX(-3px);
}

.brand {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  text-decoration: none;
  user-select: none;
}

.brand span {
  color: var(--accent);
}

.theme-switcher {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
}

.theme-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid transparent;
  cursor: pointer;
  outline: none;
  transition: var(--transition-smooth);
}

.theme-dot[data-theme="gold"] { background-color: #d1b280; }
.theme-dot[data-theme="nordic"] { background-color: #67e8f9; }
.theme-dot[data-theme="forest"] { background-color: #a7f3d0; }

.theme-dot:hover {
  transform: scale(1.15);
}

.theme-dot.active {
  border-color: var(--text-primary);
  box-shadow: 0 0 14px 4px rgba(var(--accent-rgb), 0.4);
  transform: scale(1.1);
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */

.centered-layout {
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Glassmorphism card block */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.75rem;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  background: var(--bg-card-solid);
  border-color: var(--accent);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), 0 0 50px 6px rgba(var(--accent-rgb), 0.28);
}

/* Loading state overlay */
.spinner-overlay {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-dark);
  opacity: 0.8;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  align-items: center;
  justify-content: center;
  border-radius: 24px;
  z-index: 10;
}

.spinner-overlay.active {
  display: flex;
}

.loading-spinner {
  display: inline-block;
  width: 2.25rem;
  height: 2.25rem;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--accent);
  animation: spin 0.8s cubic-bezier(0.5, 0.1, 0.4, 0.9) infinite;
}

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

/* Card Header */
.card-meta-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  /* Reserve height so card doesn't jump when date text loads */
  min-height: 1.5rem;
}

.date-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
  /* Prevent width-change reflow when content loads */
  min-width: 6rem;
}

.wotd-badge {
  display: inline-flex;
  align-items: center;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.12);
  border: 1px solid rgba(251, 191, 36, 0.3);
  box-shadow: 0 0 12px rgba(251, 191, 36, 0.15);
  text-transform: uppercase;
}

.wotd-badge.unfeatured {
  color: var(--text-muted, #a0aec0);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: none;
}

/* Word Showcase details */
.word-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
  /* Reserve height so card doesn't jump when word loads */
  min-height: 4.5rem;
}

.word-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
}


.word-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  line-height: 1.1;
  text-transform: lowercase;
  /* Reserve one line of height so the card doesn't jump before content loads */
  min-height: 1.1em;
  overflow-wrap: break-word;
  word-break: break-word;
}

.part-of-speech {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--accent);
  background: var(--accent-muted);
  border: 1px solid var(--border-focus);
  padding: 0.15rem 0.6rem;
  border-radius: 9999px;
  text-transform: lowercase;
  vertical-align: middle;
}

/* Action Control Buttons */
.action-buttons {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}


.action-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  outline: none;
  transition: var(--transition-smooth);
}

.action-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  box-shadow: 0 0 15px 1px rgba(var(--accent-rgb), 0.2);
  background: var(--accent-muted);
  transform: translateY(-2px);
}

.action-btn:active {
  transform: translateY(0);
}

.submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  background: var(--accent-gradient);
  color: var(--bg-dark);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-subtle);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px 2px rgba(var(--accent-rgb), 0.4);
  color: var(--bg-dark);
}

.submit-btn:active {
  transform: translateY(0);
}

/* Tooltip implementation */
.tooltip {
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  pointer-events: none;
  opacity: 0;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  transition: var(--transition-smooth);
  z-index: 100;
}

.tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: var(--bg-dark) transparent transparent transparent;
}

.tooltip.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Content Blocks */
.definition-box {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-weight: 400;
  /* Reserve ~3 lines of height so the card doesn't collapse while loading */
  min-height: calc(1.15rem * 1.75 * 3);
}

.origin-box {
  margin-top: 1.5rem;
  margin-bottom: 2.25rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.015);
  border-left: 2px solid var(--accent);
  border-radius: 0 12px 12px 0;
}

.origin-label {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

#wordOriginText {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
  font-style: italic;
}

/* Bottom Stats details layout */
.meta-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.meta-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  /* Hold label height so grid row doesn't collapse before text loads */
  min-height: 0.9rem;
}

.meta-value {
  font-family: 'Outfit', sans-serif;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  /* Reserve one line so layout doesn't shift when value populates */
  min-height: 1.4rem;
}

/* ==========================================================================
   Historical Search (Lookup Pill)
   ========================================================================== */

.lookup-section {
  display: flex;
  flex-direction: column;
  /* Stretch to full column width — same as every other card in the layout */
  align-items: stretch;
  width: 100%;
}

.lookup-pill {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  padding: 0.4rem 0.4rem 0.4rem 1.25rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-subtle);
  transition: all 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.lookup-pill:hover,
.lookup-pill:focus-within {
  background: var(--bg-card-solid);
  border-color: var(--accent);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), 0 0 50px 6px rgba(var(--accent-rgb), 0.28);
  transition: all 1.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.input-icon-wrapper {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 0.75rem;
}

input[type="date"] {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-primary);
  width: 100%;
}

input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.85);
  cursor: pointer;
  opacity: 0.6;
  transition: var(--transition-smooth);
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
  opacity: 1;
}

.lookup-btn {
  background: var(--text-primary);
  color: var(--bg-dark);
  border: none;
  border-radius: 9999px;
  padding: 0.5rem 1.25rem;
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  outline: none;
}

.lookup-btn:hover {
  background: var(--accent);
  color: var(--bg-dark);
  box-shadow: 0 0 18px 2px rgba(var(--accent-rgb), 0.35);
  transform: translateY(-1px);
}

.error-msg {
  color: #f87171;
  font-size: 0.8rem;
  margin-top: 0.75rem;
  display: none;
  background: rgba(248, 113, 113, 0.05);
  border: 1px solid rgba(248, 113, 113, 0.15);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  text-align: center;
  font-weight: 500;
}

/* ==========================================================================
   History Section Feed
   ========================================================================== */

.history-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.history-divider {
  display: flex;
  align-items: center;
  text-align: center;
}

.history-divider::before,
.history-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.history-divider span {
  padding: 0 1rem;
  font-family: 'Outfit', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.history-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  max-height: 540px;
  overflow-y: auto;
  /* Clean scroll padding — no negative-margin hack that clips content */
  padding: 0.5rem 0.25rem 2rem;
  /* Scrollbar gutter reserved so list doesn't reflow when scrollbar appears */
  scrollbar-gutter: stable;
}

.history-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
  padding: 1.1rem 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.history-item:hover,
.history-item.active:hover {
  background: var(--bg-card-solid);
  border-color: var(--accent);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), 0 0 50px 6px rgba(var(--accent-rgb), 0.28);
  transform: translateY(-2px);
  transition: all 1.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.history-item.active {
  border-color: var(--border-focus);
  background: rgba(255, 255, 255, 0.02);
  box-shadow: inset 0 0 12px rgba(255,255,255,0.01);
}

.history-item.active .hist-word {
  color: var(--accent);
}

.hist-word {
  font-family: 'Playfair Display', serif;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: lowercase;
  margin: 0;
}

.hist-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.hist-details {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: 0.2rem;
  opacity: 0.75;
  transition: opacity 0.2s ease;
}

.history-item:hover .hist-details {
  opacity: 1;
}

@media (min-width: 600px) {
  .history-list {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}


/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: auto;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.01em;
}

/* ==========================================================================
   Pipeline Detail Section & Diagram
   ========================================================================== */

.footer-container {
  max-width: 680px;
  margin: 0 auto;
  text-align: left;
}

.footer-divider {
  border-top: 1px solid var(--border-color);
  text-align: center;
  padding-top: 2rem;
  margin-bottom: 2.5rem;
}

.footer-divider::before,
.footer-divider::after {
  display: none;
}

.footer-divider span {
  font-family: 'Outfit', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-muted);
  white-space: nowrap;
}

.footer-divider span span {
  color: var(--accent);
}

.pipeline-section {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.pipeline-flow-wrapper {
  overflow-x: auto;
  padding: 0.5rem 0;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 0.5rem;
  /* Don't let wrapper clip left edge of SVG at narrow widths */
  scrollbar-gutter: stable;
}

.pipeline-svg {
  /* min-width keeps the SVG intrinsically scrollable rather than clipped */
  min-width: 680px;
  width: 100%;
  height: 120px;
  display: block;
}

.pipeline-node rect {
  fill: var(--bg-card);
  stroke: var(--border-color);
  transition: var(--transition-smooth);
}

.pipeline-node:hover rect {
  stroke: var(--accent);
  fill: rgba(var(--accent-rgb), 0.03);
  filter: drop-shadow(0 0 10px rgba(var(--accent-rgb), 0.25));
}

.pipeline-node svg {
  stroke: var(--text-muted);
  transition: var(--transition-smooth);
}

.pipeline-node:hover svg {
  stroke: var(--accent);
  transform: translateY(-1px);
}

.node-label {
  font-family: 'Outfit', sans-serif;
  font-size: 10px;
  font-weight: 600;
  fill: var(--text-primary);
  letter-spacing: 0.02em;
}

.node-sublabel {
  font-family: 'JetBrains Mono', monospace;
  font-size: 8px;
  font-weight: 400;
  fill: var(--text-muted);
}

.pipeline-blog {
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.pipeline-blog p {
  margin: 0;
}

.pipeline-blog strong {
  color: var(--accent);
  font-weight: 600;
}

.brand-inline {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-inline span {
  color: var(--accent);
}

/* ==========================================================================
   Animations & Media Queries
   ========================================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.navbar, .centered-layout > * {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.navbar {
  animation-delay: 0.05s;
}

.active-word-container {
  animation-delay: 0.15s;
}

.lookup-section {
  animation-delay: 0.25s;
}

.history-section {
  animation-delay: 0.35s;
}

.footer {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.45s;
}

/* Responsive adjustments for mobile devices */
@media (max-width: 550px) {
  .centered-layout {
    padding: 1.5rem 1rem 4rem;
    gap: 1.75rem;
  }

  .glass-card {
    padding: 1.5rem;
    border-radius: 20px;
  }

  .word-header {
    gap: 0.5rem;
    min-height: auto;
    margin-bottom: 1.25rem;
  }

  .word-meta-row {
    width: 100%;
    gap: 0.5rem;
  }

  .word-title {
    font-size: 2.5rem;
  }

  .action-buttons {
    width: 100%;
    justify-content: flex-start;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--border-color);
  }

  .definition-box {
    font-size: 1.05rem;
    min-height: calc(1.05rem * 1.75 * 3);
    margin-bottom: 1.5rem;
  }

  .origin-box {
    padding: 1rem;
    margin-top: 1rem;
    margin-bottom: 1.5rem;
  }

  .meta-details {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding-top: 1.5rem;
  }
}

@media (max-width: 480px) {
  .navbar-container {
    padding: 0 1rem;
  }

  .navbar-left {
    gap: 0.75rem;
  }

  .back-btn {
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
  }

  .brand {
    font-size: 1.25rem;
  }

  .theme-switcher {
    padding: 0.25rem 0.5rem;
    gap: 0.5rem;
  }

  .theme-dot {
    width: 12px;
    height: 12px;
  }

  .subscription-form .input-group {
    flex-direction: column;
    border-radius: 16px;
    padding: 0.5rem;
    align-items: stretch;
    gap: 0.5rem;
  }

  .subscription-form input[type="email"] {
    padding: 0.5rem 0.75rem;
    text-align: center;
  }

  .subscription-form .subscribe-btn {
    width: 100%;
    border-radius: 12px;
    padding: 0.65rem 1.5rem;
  }
}

@media (max-width: 400px) {
  .word-title {
    font-size: 2.2rem;
  }

  .cal-day-num {
    font-size: 0.75rem;
  }

  .calendar-weekdays span {
    font-size: 0.65rem;
  }
}

/* ==========================================================================
   Custom Calendar Widget
   ========================================================================== */

.calendar-widget {
  width: 100%;
  /* Full column width — no narrow centering that misaligns with cards above/below */
  max-width: 100%;
  padding: 0;
  user-select: none;
  overflow: hidden; /* clip the sliding body */
}

/* ── Collapse trigger (always-visible header row) ── */
.cal-collapse-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.1rem 1.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
  gap: 0.75rem;
  border-radius: 24px; /* matches glass-card */
  transition: background 0.2s ease;
}

.cal-collapse-trigger:hover {
  background: rgba(var(--accent-rgb), 0.06);
}

.cal-trigger-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.cal-trigger-icon {
  color: var(--accent);
  flex-shrink: 0;
  opacity: 0.85;
}

.cal-trigger-label {
  font-family: 'Outfit', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.cal-trigger-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cal-trigger-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.cal-trigger-chevron {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s ease;
}

/* When open, rotate chevron */
.calendar-widget.is-open .cal-trigger-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

/* ── Collapsible body ── */
.cal-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.calendar-widget.is-open .cal-body {
  grid-template-rows: 1fr;
}

.cal-body-inner {
  overflow: hidden;
  padding: 0 1.5rem 1.5rem;
}

/* Separator line between trigger and body */
.calendar-widget.is-open .cal-collapse-trigger {
  border-bottom: 1px solid var(--border-color);
  border-radius: 24px 24px 0 0;
}



/* Header: prev / month-label / next */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.cal-month-label {
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.cal-nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition-smooth);
  padding: 0;
  flex-shrink: 0;
}

.cal-nav-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-muted);
}

.cal-nav-btn:disabled {
  opacity: 0.25;
  cursor: default;
}

/* Day-of-week header row */
.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  margin-bottom: 0.4rem;
  gap: 2px;
}

.calendar-weekdays span {
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.25rem 0;
  letter-spacing: 0.05em;
}

/* Day grid */
.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

/* Individual day cell */
.cal-day {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: default;
  padding: 0;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  outline: none;
  gap: 2px;
}

.cal-day-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1;
}

.cal-day--empty {
  pointer-events: none;
}

/* Days WITH data — clickable & highlighted */
.cal-day--has-data {
  cursor: pointer;
}

.cal-day--has-data .cal-day-num {
  color: var(--text-primary);
  font-weight: 600;
}

.cal-day--has-data:hover {
  background: var(--accent-muted);
  border-color: rgba(var(--accent-rgb), 0.3);
  transform: scale(1.08);
}

/* Accent dot shown on data days */
.cal-day-dot {
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
  flex-shrink: 0;
}

.cal-day--has-data:hover .cal-day-dot {
  opacity: 1;
}

/* Today ring */
.cal-day--today {
  border-color: rgba(var(--accent-rgb), 0.35);
}

.cal-day--today .cal-day-num {
  color: var(--accent);
}

/* Active / selected day */
.cal-day--active {
  background: rgba(var(--accent-rgb), 0.15) !important;
  border-color: var(--accent) !important;
  box-shadow: 0 0 12px 0 rgba(var(--accent-rgb), 0.2);
}

.cal-day--active .cal-day-num {
  color: var(--accent) !important;
  font-weight: 700;
}

.cal-day--active .cal-day-dot {
  opacity: 1;
}

/* Disabled days (no data) */
.cal-day--disabled {
  opacity: 0.25;
  cursor: not-allowed;
}


/* ==========================================================================
   Embedding Space Scatter Plot Visual Layout
   ========================================================================== */

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  width: 100%;
}


@media (min-width: 1024px) {
  .centered-layout,
  .navbar-container {
    max-width: 900px;
  }

  /* Dashboard remains single-column; vocabulary map stacks below the word card */
}

#embeddingCard {
  overflow: visible;
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  max-width: 540px;
  aspect-ratio: 1;
  border-radius: 16px;
  overflow: visible;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  margin: 1.5rem auto 0;
}

.canvas-wrapper canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  border-radius: 16px;
}

.embedding-tooltip {
  display: none;
  position: absolute;
  pointer-events: none;
  z-index: 100;
  padding: 0.6rem 0.85rem;
  background: rgba(10, 10, 14, 0.92);
  border: 1px solid var(--border-focus);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.8rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transform: translate(-50%, 0);
  transition: opacity 0.15s ease;
  line-height: 1.4;
}

.embedding-tooltip strong {
  display: block;
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.2rem;
  font-family: 'Outfit', sans-serif;
  text-transform: capitalize;
}

.embedding-tooltip span {
  color: var(--text-secondary);
  font-family: inherit;
}

.embedding-tooltip .tooltip-date {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  font-family: monospace;
}

/* ==========================================================================
   Newsletter Subscription Section
   ========================================================================== */

.subscription-section {
  margin-top: 1rem;
}

.subscription-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.subscription-form .input-group {
  display: flex;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  padding: 0.35rem 0.35rem 0.35rem 1.25rem;
  align-items: center;
  transition: var(--transition-smooth);
}

.subscription-form .input-group:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 15px 1px rgba(var(--accent-rgb), 0.2);
  background: rgba(255, 255, 255, 0.05);
}

.subscription-form input[type="email"] {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: var(--text-primary);
  width: 100%;
  padding: 0.5rem 0;
}

.subscription-form input[type="email"]::placeholder {
  color: var(--text-muted);
}

.subscription-form .subscribe-btn {
  background: var(--text-primary);
  color: var(--bg-dark);
  border: none;
  border-radius: 9999px;
  padding: 0.65rem 1.5rem;
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  outline: none;
}

.subscription-form .subscribe-btn:hover {
  background: var(--accent);
  color: var(--bg-dark);
  box-shadow: 0 0 18px 2px rgba(var(--accent-rgb), 0.35);
  transform: translateY(-1px);
}

.subscription-form .subscribe-btn:active {
  transform: translateY(0);
}

.subscription-form .success-msg {
  color: var(--accent);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  background: rgba(var(--accent-rgb), 0.05);
  border: 1px solid var(--border-color);
  padding: 0.6rem 1.25rem;
  border-radius: 9999px;
  text-align: center;
  font-weight: 500;
}

/* Constraint Validation (Modern :user-invalid with fallback) */
.subscription-form input[type="email"]:user-invalid,
.subscription-form input[type="email"].user-invalid-fallback {
  color: #f87171;
}

.subscription-form .input-group:has(input[type="email"]:user-invalid),
.subscription-form .input-group:has(input[type="email"].user-invalid-fallback) {
  border-color: rgba(248, 113, 113, 0.4);
  background: rgba(248, 113, 113, 0.02);
}


/* --- Voting Widget & Toast Styling --- */
.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.vote-widget {
  display: flex;
  align-items: center;
  background: var(--accent-muted);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  padding: 2px 6px;
  gap: 6px;
  transition: var(--transition-smooth);
}

.vote-widget:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-subtle);
}

.vote-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  transition: var(--transition-smooth);
}

.vote-btn svg {
  transition: transform 0.2s ease;
}

.vote-btn:hover {
  color: var(--text-primary);
  background: rgba(var(--accent-rgb), 0.12);
}

.vote-btn:hover svg {
  transform: translateY(-2px);
}

.vote-btn.downvote:hover svg {
  transform: translateY(2px);
}

.vote-btn:active {
  transform: scale(0.9);
}

.vote-btn.active-up {
  color: #ff5a1f; /* Premium warm orange */
  background: rgba(255, 90, 31, 0.1);
  filter: drop-shadow(0 0 6px rgba(255, 90, 31, 0.3));
}

.vote-btn.active-up:hover {
  color: #ff7747;
  background: rgba(255, 90, 31, 0.15);
}

.vote-btn.active-down {
  color: #5d7cf8; /* Premium periwinkle blue */
  background: rgba(93, 124, 248, 0.1);
  filter: drop-shadow(0 0 6px rgba(93, 124, 248, 0.3));
}

.vote-btn.active-down:hover {
  color: #7994fa;
  background: rgba(93, 124, 248, 0.15);
}

.vote-score {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  min-width: 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  user-select: none;
}

.vote-score.positive {
  color: #ff5a1f;
}

.vote-score.negative {
  color: #5d7cf8;
}

.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.8rem 1.4rem;
  border-radius: 12px;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(10px);
  pointer-events: auto;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.4);
  background: rgba(239, 68, 68, 0.05);
  color: #f87171;
}

/* Share Widget Styles */
.share-widget-container {
  position: relative;
  display: inline-block;
}

.share-action-btn {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  padding: 0 1rem;
  height: 38px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  outline: none;
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.share-action-btn:hover {
  background: var(--accent-muted);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 183, 3, 0.15);
}

.share-action-btn svg {
  transition: transform 0.3s ease;
}

.share-action-btn:hover svg {
  transform: rotate(15deg) scale(1.05);
}

/* Tooltip bubble styled as glassmorphic popup */
.share-tooltip-bubble {
  position: absolute;
  bottom: 120%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: rgba(19, 21, 26, 0.85);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  color: var(--text-normal);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s;
  z-index: 100;
}

/* Tooltip triangle indicator */
.share-tooltip-bubble::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: rgba(19, 21, 26, 0.85) transparent transparent transparent;
}

.share-tooltip-bubble.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}