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

:root {
  --bg: #eef3fb;
  --surface: rgba(255,255,255,0.82);
  --surface-2: rgba(238,243,251,0.92);
  --surface-strong: #ffffff;
  --label: #0f172a;
  --label-secondary: rgba(30,41,59,0.62);
  --accent: #1d4ed8;
  --accent-green: #34c759;
  --accent-red: #ff3b30;
  --separator: rgba(148,163,184,0.24);
  --radius: 18px;
  --radius-icon: 24px;
  --shadow-sm: rgba(15,23,42,0.08);
  --shadow-md: rgba(15,23,42,0.12);
  --shadow-lg: rgba(15,23,42,0.16);
  --font: "SF Pro Text", "SF Pro Display", system-ui, -apple-system, sans-serif;
  --home-glow-a: rgba(29,78,216,0.18);
  --home-glow-b: rgba(249,115,22,0.14);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07111f;
    --surface: rgba(14,23,38,0.82);
    --surface-2: rgba(18,30,48,0.92);
    --surface-strong: #0f172a;
    --label: #f8fafc;
    --label-secondary: rgba(226,232,240,0.68);
    --separator: rgba(148,163,184,0.18);
    --shadow-sm: rgba(2,6,23,0.28);
    --shadow-md: rgba(2,6,23,0.4);
    --shadow-lg: rgba(2,6,23,0.52);
    --home-glow-a: rgba(56,189,248,0.14);
    --home-glow-b: rgba(59,130,246,0.18);
  }
}

html, body {
  height: 100%;
  overflow: hidden;
  background:
    radial-gradient(circle at top left, var(--home-glow-a), transparent 34%),
    radial-gradient(circle at top right, var(--home-glow-b), transparent 30%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 80%, white 20%), var(--bg));
  color: var(--label);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

/* ── Layout Panels ──────────────────────────────────────────────── */
#home-grid,
#tool-view {
  position: fixed;
  inset: 0;
  transition: transform 0.25s ease-out;
  will-change: transform;
}

#home-grid {
  background: transparent;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-top: env(safe-area-inset-top);
  padding-bottom: calc(32px + env(safe-area-inset-bottom));
  transform: translateX(0);
}

#home-grid.slide-out {
  transform: translateX(-100%);
}

#tool-view {
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg) 72%, transparent), var(--bg));
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
}

#tool-view.active {
  transform: translateX(0);
}

/* ── Icon Grid ──────────────────────────────────────────────────── */
.home-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 15% 12%, rgba(255,255,255,0.4), transparent 24%),
    radial-gradient(circle at 88% 10%, rgba(255,255,255,0.22), transparent 20%);
  opacity: 0.9;
}

#home-header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 20px 8px;
}

#home-eyebrow {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--label-secondary);
  margin-bottom: 10px;
}

#home-title {
  max-width: 12ch;
  font-size: clamp(30px, 7vw, 40px);
  line-height: 0.98;
  letter-spacing: -0.04em;
  margin-bottom: 10px;
}

#home-subtitle {
  max-width: 32ch;
  font-size: 15px;
  line-height: 1.45;
  color: var(--label-secondary);
}

#version-badge {
  position: sticky;
  top: calc(8px + env(safe-area-inset-top));
  flex-shrink: 0;
  min-width: 56px;
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,0.32);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface-strong) 74%, transparent);
  box-shadow: 0 10px 22px var(--shadow-sm);
  backdrop-filter: blur(16px);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-align: center;
  color: var(--label);
  z-index: 3;
}

#icon-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 20px;
  padding-top: 18px;
  position: relative;
  z-index: 1;
}

#external-links {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  padding: 8px 20px 0;
}

#external-links-title {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--label-secondary);
}

#external-links-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.external-link-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 124px;
  padding: 16px 10px 14px;
  border-radius: 24px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--surface-strong) 88%, transparent), color-mix(in srgb, var(--surface) 92%, transparent));
  border: 1px solid rgba(255,255,255,0.34);
  box-shadow: 0 14px 30px var(--shadow-sm);
  backdrop-filter: blur(16px);
  color: inherit;
  text-decoration: none;
  transition: transform 0.14s ease-out, box-shadow 0.14s ease-out;
}

.external-link-card:hover,
.external-link-card:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 18px 38px var(--shadow-md);
}

.external-link-madlib {
  background:
    radial-gradient(circle at top right, rgba(168,85,247,0.18), transparent 34%),
    linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.78));
}

.external-link-citv {
  background:
    radial-gradient(circle at top right, rgba(249,115,22,0.16), transparent 34%),
    linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.78));
}

.external-link-rca {
  background:
    radial-gradient(circle at top right, rgba(16,185,129,0.18), transparent 34%),
    linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.78));
}

.external-link-mark {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: #fff;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.22), 0 10px 18px rgba(15,23,42,0.18);
  white-space: nowrap;
}

.external-link-madlib .external-link-mark {
  background: linear-gradient(135deg, #7c3aed, #ec4899);
}

.external-link-citv .external-link-mark {
  background: linear-gradient(135deg, #f97316, #ea580c);
}

.external-link-rca .external-link-mark {
  background: linear-gradient(135deg, #10b981, #0f766e);
}

.external-link-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  align-items: center;
  text-align: center;
}

.external-link-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--label);
}

.external-link-url {
  font-size: 11px;
  color: var(--label-secondary);
}

.external-link-arrow {
  font-size: 14px;
  font-weight: 700;
  color: var(--label-secondary);
}

.tool-icon-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  padding: 16px 8px 14px;
  border-radius: 26px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border: 1px solid rgba(255,255,255,0.3);
  box-shadow: 0 12px 28px var(--shadow-sm);
  backdrop-filter: blur(16px);
  animation: tile-in 0.35s ease-out both;
  animation-delay: calc(var(--stagger, 0) * 35ms);
  transition: transform 0.14s ease-out, box-shadow 0.14s ease-out, background 0.14s ease-out;
}

.tool-icon {
  width: 84px;
  height: 84px;
  border-radius: var(--radius-icon);
  transition: transform 0.1s ease-out;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.22), 0 12px 18px rgba(15,23,42,0.18);
}

.tool-icon-wrapper:hover,
.tool-icon-wrapper:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 38px var(--shadow-md);
}

.tool-icon-wrapper:active .tool-icon {
  transform: scale(0.92);
}

.tool-icon-glyph {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.16);
  white-space: nowrap;
}

.tool-label {
  font-size: 12px;
  font-weight: 700;
  color: color-mix(in srgb, var(--label) 82%, var(--label-secondary));
  text-align: center;
  line-height: 1.3;
  max-width: 92px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* Dark mode: QR icon is near-black — invert to white */
@media (prefers-color-scheme: dark) {
  .tool-icon[data-id="qr-generator"] {
    background-color: #ffffff !important;
  }

  .tool-icon[data-id="qr-generator"] .tool-icon-glyph {
    color: #111827;
    text-shadow: none;
  }
}

/* ── Tool View Header ───────────────────────────────────────────── */
#tool-header {
  display: flex;
  align-items: center;
  padding: 0 18px;
  padding-top: env(safe-area-inset-top);
  height: calc(44px + env(safe-area-inset-top));
  border-bottom: 1px solid var(--separator);
  background: color-mix(in srgb, var(--surface-strong) 72%, transparent);
  backdrop-filter: blur(20px);
  flex-shrink: 0;
  position: relative;
}

#back-btn {
  background: none;
  border: none;
  font-size: 28px;
  line-height: 1;
  color: var(--accent);
  cursor: pointer;
  padding: 0 8px 0 0;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

#tool-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 17px;
  font-weight: 600;
  color: var(--label);
  white-space: nowrap;
}

/* ── Tool Content Area ──────────────────────────────────────────── */
#tool-content {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 18px;
  padding-bottom: calc(18px + env(safe-area-inset-bottom));
  background: transparent;
}

/* ── Shared Tool Components ─────────────────────────────────────── */

/* Card / section container */
.card {
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 12px;
  border: 1px solid rgba(255,255,255,0.28);
  box-shadow: 0 16px 36px var(--shadow-sm);
  backdrop-filter: blur(18px);
}

/* iOS-style input */
.input {
  width: 100%;
  min-height: 44px;
  border: 1px solid transparent;
  background: color-mix(in srgb, var(--surface-2) 96%, transparent);
  border-radius: 12px;
  padding: 0 12px;
  font-size: 16px;
  font-family: var(--font);
  color: var(--label);
  outline: none;
  -webkit-appearance: none;
}

.input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 38%, white);
  outline-offset: -2px;
  border-color: color-mix(in srgb, var(--accent) 26%, transparent);
}

textarea.input {
  padding: 12px;
  resize: none;
  line-height: 1.5;
}

/* Primary button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: opacity 0.1s, transform 0.12s ease-out, box-shadow 0.12s ease-out;
  box-shadow: 0 12px 22px rgba(29,78,216,0.2);
}

.btn:active { opacity: 0.7; }
.btn:hover,
.btn:focus-visible { transform: translateY(-1px); }

.btn-full { width: 100%; }

.btn-secondary {
  background: color-mix(in srgb, var(--surface-2) 92%, transparent);
  color: var(--label);
  font-weight: 400;
  box-shadow: none;
}

.btn-sm {
  min-height: 36px;
  font-size: 14px;
  padding: 0 12px;
}

/* Label above an input */
.field-label {
  font-size: 13px;
  color: var(--label-secondary);
  margin-bottom: 6px;
}

/* Row of buttons */
.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Segmented control */
.segmented {
  display: flex;
  background: color-mix(in srgb, var(--surface-2) 92%, transparent);
  border-radius: 12px;
  padding: 3px;
  gap: 2px;
  margin-bottom: 16px;
  border: 1px solid rgba(255,255,255,0.2);
}

.segmented button {
  flex: 1;
  min-height: 32px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--label);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  touch-action: manipulation;
}

.segmented button.active {
  background: color-mix(in srgb, var(--surface-strong) 84%, transparent);
  color: var(--label);
  box-shadow: 0 6px 18px var(--shadow-sm);
}

/* Toggle switch */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: 0 16px;
  border-bottom: 1px solid var(--separator);
}

.toggle-row:last-child { border-bottom: none; }

.toggle-label {
  font-size: 16px;
  color: var(--label);
}

.toggle {
  position: relative;
  width: 51px;
  height: 31px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-track {
  position: absolute;
  inset: 0;
  border-radius: 15.5px;
  background: var(--separator);
  transition: background 0.2s;
  cursor: pointer;
}

.toggle input:checked + .toggle-track { background: var(--accent-green); }

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px var(--shadow-lg);
  transition: transform 0.2s;
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(20px);
}

/* Stepper */
.stepper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stepper-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
}

.stepper-btn:disabled { background: var(--separator); }

.stepper-value {
  font-size: 17px;
  min-width: 32px;
  text-align: center;
}

/* Stat grid (word count) */
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stat-card {
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  border-radius: var(--radius);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border: 1px solid rgba(255,255,255,0.24);
  box-shadow: 0 12px 30px var(--shadow-sm);
}

.stat-value {
  font-size: 20px;
  font-weight: 600;
  color: var(--label);
}

.stat-label {
  font-size: 12px;
  color: var(--label-secondary);
}

/* Strength bar */
.strength-bar-wrap {
  height: 6px;
  background: var(--surface-2);
  border-radius: 3px;
  overflow: hidden;
  margin: 8px 0 4px;
}

.strength-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s, background 0.3s;
}

/* Autocomplete dropdown */
.autocomplete {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px var(--shadow-md);
  z-index: 100;
  overflow: hidden;
  max-height: 220px;
  overflow-y: auto;
}

.autocomplete-item {
  padding: 12px 16px;
  font-size: 15px;
  cursor: pointer;
  border-bottom: 1px solid var(--separator);
  touch-action: manipulation;
}

.autocomplete-item:last-child { border-bottom: none; }
.autocomplete-item:active { background: var(--surface-2); }

/* Part-of-speech chip */
.pos-chip {
  display: inline-block;
  padding: 2px 10px;
  background: var(--accent);
  color: #fff;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-right: 6px;
  margin-bottom: 6px;
}

/* Synonym / antonym pill */
.word-pill {
  display: inline-block;
  padding: 4px 12px;
  background: var(--surface-2);
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
  margin: 4px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* Recent color swatches */
.color-swatch-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.color-swatch {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--separator);
  flex-shrink: 0;
  touch-action: manipulation;
}

/* Update banner */
#update-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: color-mix(in srgb, var(--surface-strong) 80%, transparent);
  border-top: 1px solid var(--separator);
  box-shadow: 0 -2px 16px var(--shadow-sm);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transform: translateY(100%);
  transition: transform 0.3s ease-out;
}

#update-banner.visible { transform: translateY(0); }

.update-banner-text { flex: 1; }
.update-banner-title { font-size: 15px; font-weight: 600; color: var(--label); }
.update-banner-sub { font-size: 13px; color: var(--label-secondary); }

.update-banner-actions { display: flex; gap: 8px; }

@keyframes tile-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 420px) {
  #home-header {
    padding: 18px 16px 8px;
  }

  #icon-grid {
    gap: 14px;
    padding: 16px;
  }

  #external-links {
    padding: 4px 16px 0;
  }

  #external-links-grid {
    gap: 10px;
  }

  .external-link-card {
    min-height: 116px;
    padding: 14px 8px 12px;
  }

  .external-link-mark {
    width: 52px;
    height: 52px;
  }

  .tool-icon-wrapper {
    padding: 14px 6px 12px;
  }

  .tool-icon {
    width: 76px;
    height: 76px;
  }
}