/* ========================================
   WORDLE ANALYZER - DESIGN SYSTEM
   Premium Dark Theme with Wordle Aesthetics
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ---- CSS Variables / Design Tokens ---- */
:root {
  /* Colors */
  --color-bg: #121213;
  --color-bg-secondary: #1a1a1b;
  --color-bg-tertiary: #242426;
  --color-surface: #1e1e1f;
  --color-surface-hover: #2a2a2b;
  --color-border: #3a3a3c;
  --color-border-light: #565758;

  --color-text: #f0f0f0;
  --color-text-secondary: #a0a0a2;
  --color-text-muted: #6a6a6c;

  /* Wordle Colors */
  --color-green: #538d4e;
  --color-green-bright: #6aaa64;
  --color-green-glow: rgba(106, 170, 100, 0.3);
  --color-yellow: #b59f3b;
  --color-yellow-bright: #c9b458;
  --color-yellow-glow: rgba(201, 180, 88, 0.3);
  --color-gray: #3a3a3c;
  --color-gray-bright: #565758;

  /* Accent */
  --color-accent: #6366f1;
  --color-accent-light: #818cf8;
  --color-accent-glow: rgba(99, 102, 241, 0.25);

  /* Feedback */
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-green: 0 0 20px var(--color-green-glow);
  --shadow-glow-yellow: 0 0 20px var(--color-yellow-glow);
  --shadow-glow-accent: 0 0 20px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
}

/* ---- Light Mode ---- */
.light-mode {
  --color-bg: #f7f7f8;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #eeeef0;
  --color-surface: #ffffff;
  --color-surface-hover: #f0f0f2;
  --color-border: #d3d6da;
  --color-border-light: #e2e2e4;

  --color-text: #1a1a1b;
  --color-text-secondary: #5a5a5c;
  --color-text-muted: #9a9a9c;

  --color-gray: #787c7e;
  --color-gray-bright: #d3d6da;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

/* ---- Background Ambiance ---- */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(83, 141, 78, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(181, 159, 59, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(99, 102, 241, 0.04) 0%, transparent 50%);
  z-index: -1;
  pointer-events: none;
  animation: ambientFloat 20s ease-in-out infinite alternate;
}

@keyframes ambientFloat {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }

  100% {
    transform: translate(-2%, -2%) rotate(3deg);
  }
}

/* ---- Header ---- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  background: rgba(18, 18, 19, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.light-mode .header {
  background: rgba(255, 255, 255, 0.85);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.header__logo:hover {
  text-decoration: none;
  color: var(--color-text);
}

.header__logo-icon {
  display: flex;
  gap: 3px;
}

.header__logo-tile {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.75rem;
  color: white;
  animation: tileFlip 3s ease-in-out infinite;
}

.header__logo-tile:nth-child(1) {
  background: var(--color-green);
  animation-delay: 0s;
}

.header__logo-tile:nth-child(2) {
  background: var(--color-yellow);
  animation-delay: 0.15s;
}

.header__logo-tile:nth-child(3) {
  background: var(--color-green);
  animation-delay: 0.3s;
}

.header__logo-tile:nth-child(4) {
  background: var(--color-gray);
  animation-delay: 0.45s;
}

.header__logo-tile:nth-child(5) {
  background: var(--color-green);
  animation-delay: 0.6s;
}

@keyframes tileFlip {

  0%,
  85%,
  100% {
    transform: rotateX(0);
  }

  90% {
    transform: rotateX(180deg);
  }
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav__link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
  text-decoration: none;
}

.nav__link--active {
  color: var(--color-accent-light);
  background: var(--color-accent-glow);
}

/* Dark Mode Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
  margin-left: var(--space-sm);
}

.theme-toggle:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow-accent);
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.mobile-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ---- Hero Section ---- */
.hero {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl) var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  background: var(--color-accent-glow);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--color-accent-light);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.03em;
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-light);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.hero__title-gradient {
  background: linear-gradient(135deg, var(--color-green-bright) 0%, var(--color-yellow-bright) 50%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  font-weight: 400;
}

/* ---- Main Content Layout ---- */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl) var(--space-3xl);
}

.grid-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

/* ---- Card Component ---- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-md);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.card__title {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card__icon {
  font-size: 1.2rem;
}

.card__badge {
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-accent-glow);
  color: var(--color-accent-light);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ---- Wordle Grid ---- */
.wordle-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.wordle-row {
  display: flex;
  gap: 6px;
}

.wordle-tile {
  width: 56px;
  height: 56px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  background: transparent;
  color: var(--color-text);
  position: relative;
  overflow: hidden;
}

.wordle-tile::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.wordle-tile:hover {
  border-color: var(--color-border-light);
  transform: scale(1.05);
}

.wordle-tile:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.wordle-tile--green {
  background: var(--color-green);
  border-color: var(--color-green);
  color: white;
  box-shadow: var(--shadow-glow-green);
  animation: tilePop 0.2s ease-out;
}

.wordle-tile--yellow {
  background: var(--color-yellow);
  border-color: var(--color-yellow);
  color: white;
  box-shadow: var(--shadow-glow-yellow);
  animation: tilePop 0.2s ease-out;
}

.wordle-tile--gray {
  background: var(--color-gray);
  border-color: var(--color-gray);
  color: white;
  animation: tilePop 0.2s ease-out;
}

.wordle-tile--filled {
  border-color: var(--color-border-light);
  animation: tileBounce 0.15s ease-out;
}

@keyframes tilePop {
  0% {
    transform: scale(0.9);
  }

  50% {
    transform: scale(1.08);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes tileBounce {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.12);
  }

  100% {
    transform: scale(1);
  }
}

/* ---- Color Selector ---- */
.color-selector {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.color-selector__label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.color-btn {
  width: 36px;
  height: 36px;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.color-btn--green {
  background: var(--color-green);
}

.color-btn--yellow {
  background: var(--color-yellow);
}

.color-btn--gray {
  background: var(--color-gray);
}

.color-btn:hover {
  transform: scale(1.1);
}

.color-btn--active {
  border-color: white;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.color-btn--active::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.9rem;
  font-weight: 700;
}

/* ---- Hard Mode Toggle ---- */
.hard-mode-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  transition: all var(--transition-fast);
}

.hard-mode-toggle:has(input:checked) {
  border-color: var(--color-warning);
  background: rgba(245, 158, 11, 0.06);
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.1);
}

.hard-mode-toggle__label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hard-mode-toggle__title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
}

.hard-mode-toggle__desc {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  line-height: 1.3;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  flex-shrink: 0;
  cursor: pointer;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-switch__slider {
  position: absolute;
  inset: 0;
  background: var(--color-border);
  border-radius: 26px;
  transition: all var(--transition-base);
}

.toggle-switch__slider::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-text-muted);
  transition: all var(--transition-base);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.toggle-switch input:checked+.toggle-switch__slider {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.3);
}

.toggle-switch input:checked+.toggle-switch__slider::before {
  transform: translateX(22px);
  background: white;
}

.toggle-switch input:focus-visible+.toggle-switch__slider {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Hard Mode Badge (next to suggestions title) */
.hard-mode-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
  animation: hardModePulse 2s ease-in-out infinite;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@keyframes hardModePulse {

  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.2);
  }

  50% {
    box-shadow: 0 0 12px 2px rgba(245, 158, 11, 0.15);
  }
}

/* Body-level hard mode active indicator */
.hard-mode-active .wordle-tile--green {
  box-shadow: var(--shadow-glow-green), 0 0 6px rgba(245, 158, 11, 0.15);
}

/* ---- Controls ---- */
.controls {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-green) 0%, var(--color-green-bright) 100%);
  color: white;
  box-shadow: 0 2px 12px var(--color-green-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--color-green-glow);
}

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

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-light);
}

.btn--accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: white;
  box-shadow: 0 2px 12px var(--color-accent-glow);
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--color-accent-glow);
}

.btn--icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-sm);
}

/* ---- Suggestions List ---- */
.suggestions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.suggestion-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.suggestion-item:hover {
  border-color: var(--color-green);
  background: rgba(83, 141, 78, 0.08);
  transform: translateX(4px);
}

.suggestion-item__rank {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--color-accent-glow);
  color: var(--color-accent-light);
  flex-shrink: 0;
}

.suggestion-item__word {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  flex: 1;
  margin-left: var(--space-md);
}

.suggestion-item__score {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.suggestion-item__score-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-green-bright);
}

.suggestion-item__score-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.suggestion-item__copy {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  margin-left: var(--space-sm);
}

.suggestion-item__copy:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
}

/* Gold rank for #1 */
.suggestion-item:first-child .suggestion-item__rank {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
}

/* ---- Stats Bar ---- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  text-align: center;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.stat-card__value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-green-bright);
  line-height: 1;
}

.stat-card__label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-xs);
}

/* ---- Letter Frequency Chart ---- */
.freq-chart {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.freq-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
}

.freq-bar__letter {
  font-family: var(--font-mono);
  font-weight: 700;
  width: 20px;
  text-align: center;
  text-transform: uppercase;
}

.freq-bar__track {
  flex: 1;
  height: 20px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.freq-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-green) 0%, var(--color-green-bright) 100%);
  border-radius: var(--radius-sm);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  min-width: 2px;
}

.freq-bar__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  width: 30px;
  text-align: right;
}

/* ---- Remaining Words ---- */
.remaining-words {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  max-height: 300px;
  overflow-y: auto;
  padding: var(--space-sm);
}

.remaining-words::-webkit-scrollbar {
  width: 6px;
}

.remaining-words::-webkit-scrollbar-track {
  background: var(--color-bg-tertiary);
  border-radius: 3px;
}

.remaining-words::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.word-chip {
  padding: 4px 10px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.word-chip:hover {
  background: var(--color-green-glow);
  border-color: var(--color-green);
  color: var(--color-green-bright);
}

/* ---- Input Field ---- */
.input-group {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.input-field {
  flex: 1;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  transition: all var(--transition-fast);
}

.input-field::placeholder {
  text-transform: none;
  letter-spacing: normal;
  color: var(--color-text-muted);
  font-weight: 400;
}

.input-field:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow-accent);
}

/* ---- Feature Cards ---- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--color-text);
  display: block;
}

.feature-card:hover {
  border-color: var(--color-green);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  color: var(--color-text);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  background: var(--color-green-glow);
}

.feature-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.feature-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ---- Section Headers ---- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-header__title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-header__desc {
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---- FAQ Section ---- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-border-light);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  border: none;
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-surface-hover);
}

.faq-question__icon {
  font-size: 1.2rem;
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: var(--space-md);
}

.faq-item--open .faq-question__icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-item--open .faq-answer {
  max-height: 500px;
}

.faq-answer__content {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
}

.footer__brand {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer__brand-title {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.footer__col-title {
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__link {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-green-bright);
  text-decoration: none;
}

.footer__bottom {
  max-width: var(--max-width);
  margin: var(--space-xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ---- Content Sections (for pages) ---- */
.page-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}

.page-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin: var(--space-2xl) 0 var(--space-md);
  letter-spacing: -0.02em;
}

.page-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: var(--space-xl) 0 var(--space-sm);
}

.page-content p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.page-content ul,
.page-content ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
}

.page-content li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

/* ---- Starting Words Table ---- */
.words-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
}

.words-table th,
.words-table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.words-table th {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
}

.words-table td {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
}

.words-table tr:hover td {
  background: var(--color-surface-hover);
}

.words-table .word-col {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-green-bright);
}

/* ---- Loading Spinner ---- */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

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

/* ---- Toast Notification ---- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-green);
  color: white;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-base);
  z-index: 300;
}

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

/* ---- Breadcrumb ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb__separator {
  color: var(--color-text-muted);
}

/* ---- Empty State ---- */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-muted);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

.empty-state__text {
  font-size: 0.9rem;
}

/* ---- Pattern Input ---- */
.pattern-input {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: var(--space-lg) 0;
}

.pattern-input__char {
  width: 56px;
  height: 56px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
  transition: all var(--transition-fast);
}

.pattern-input__char:focus {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow-accent);
  outline: none;
}

.pattern-input__char::placeholder {
  color: var(--color-text-muted);
  font-size: 1.2rem;
}

/* ---- Probability Bar ---- */
.prob-bar {
  width: 60px;
  height: 6px;
  background: var(--color-bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 4px;
}

.prob-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-green), var(--color-green-bright));
  border-radius: 3px;
  transition: width var(--transition-slow);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .grid-layout {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header {
    padding: 0 var(--space-md);
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--space-xl);
    gap: var(--space-sm);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 99;
  }

  .nav--open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: 1rem;
    padding: var(--space-md);
    width: 100%;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    padding: var(--space-xl) var(--space-md);
  }

  .main {
    padding: 0 var(--space-md) var(--space-2xl);
  }

  .wordle-tile {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }

  .pattern-input__char {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

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

@media (max-width: 480px) {
  .wordle-tile {
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }

  .pattern-input__char {
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }

  .controls {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .suggestion-item {
    padding: var(--space-sm);
  }
}

/* ========================================
   ENHANCED COMPONENTS
   ======================================== */

/* ---- AI Badge ---- */
.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.65rem;
  font-weight: 700;
  background: linear-gradient(135deg, rgba(99,102,241,0.2), rgba(139,92,246,0.2));
  color: var(--color-accent-light);
  border: 1px solid rgba(99,102,241,0.3);
  white-space: nowrap;
  letter-spacing: 0.03em;
  animation: aiBadgePulse 3s ease-in-out infinite;
}

@keyframes aiBadgePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0.15); }
  50% { box-shadow: 0 0 12px 2px rgba(99,102,241,0.1); }
}

/* ---- Enhanced Suggestion Items ---- */
.suggestion-item--top {
  border-color: var(--color-green);
  background: rgba(83,141,78,0.06);
}

.suggestion-item__metrics {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.suggestion-item__metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.suggestion-item__metric-value {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-green-bright);
}

.suggestion-item__metric-label {
  font-size: 0.6rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.suggestion-item__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-left: var(--space-sm);
}

.suggestion-item__use {
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
  color: var(--color-green-bright);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  transition: all var(--transition-fast);
}

.suggestion-item__use:hover {
  background: var(--color-green);
  color: white;
  border-color: var(--color-green);
}

/* ---- Efficiency Meter ---- */
.efficiency-meter {
  margin-bottom: var(--space-lg);
}

.efficiency-meter__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.efficiency-meter__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.efficiency-meter__value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-green-bright);
}

.efficiency-meter__track {
  width: 100%;
  height: 10px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.efficiency-meter__fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
  background: linear-gradient(90deg, var(--color-green), var(--color-green-bright));
}

/* ---- Solve Probabilities ---- */
.solve-probs {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.prob-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
}

.prob-item__label {
  width: 80px;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.prob-item__bar {
  flex: 1;
  height: 8px;
  background: var(--color-bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.prob-item__fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.prob-item__value {
  width: 36px;
  text-align: right;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ---- Letter Heatmap ---- */
.letter-heatmap {
  overflow-x: auto;
}

.heatmap-header {
  display: grid;
  grid-template-columns: 30px repeat(5, 1fr);
  gap: 2px;
  margin-bottom: 4px;
}

.heatmap-pos {
  font-size: 0.65rem;
  font-weight: 600;
  text-align: center;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.heatmap-row {
  display: grid;
  grid-template-columns: 30px repeat(5, 1fr);
  gap: 2px;
  margin-bottom: 2px;
}

.heatmap-letter {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: center;
}

.heatmap-cell {
  height: 26px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.heatmap-cell:hover {
  transform: scale(1.1);
  z-index: 1;
}

/* ---- Word Distribution Chart ---- */
.dist-chart {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dist-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
}

.dist-bar__letter {
  font-family: var(--font-mono);
  font-weight: 700;
  width: 20px;
  text-align: center;
  text-transform: uppercase;
}

.dist-bar__track {
  flex: 1;
  height: 18px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.dist-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: var(--radius-sm);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  min-width: 2px;
}

.dist-bar__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  width: 30px;
  text-align: right;
}

/* ---- Practice Game ---- */
.practice-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.practice-keyboard {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  margin-top: var(--space-lg);
}

.practice-keyboard__row {
  display: flex;
  gap: 4px;
}

.key-btn {
  min-width: 36px;
  height: 48px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
  transition: all var(--transition-fast);
  border: 1px solid var(--color-border);
}

.key-btn:hover {
  background: var(--color-surface-hover);
  transform: scale(1.05);
}

.key-btn--wide {
  min-width: 60px;
  font-size: 0.75rem;
}

.key-btn--green { background: var(--color-green); color: white; border-color: var(--color-green); }
.key-btn--yellow { background: var(--color-yellow); color: white; border-color: var(--color-yellow); }
.key-btn--gray { background: var(--color-gray); color: var(--color-text-muted); border-color: var(--color-gray); }

.practice-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.practice-stat {
  text-align: center;
  padding: var(--space-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.practice-stat__value {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-green-bright);
}

.practice-stat__label {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* ---- Statistics Charts ---- */
.stat-chart {
  margin: var(--space-lg) 0;
}

.stat-chart__title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.guess-distribution {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.guess-dist-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.guess-dist-row__label {
  width: 16px;
  font-family: var(--font-mono);
  font-weight: 700;
  text-align: center;
  font-size: 0.85rem;
}

.guess-dist-row__bar {
  flex: 1;
  height: 28px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.guess-dist-row__fill {
  height: 100%;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: var(--space-sm);
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  min-width: fit-content;
  padding-left: var(--space-sm);
}

/* ---- Leaderboard / Sortable Table ---- */
.sortable-table th {
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

.sortable-table th:hover {
  color: var(--color-accent-light);
}

.sortable-table th::after {
  content: ' ↕';
  opacity: 0.3;
  font-size: 0.7rem;
}

.sortable-table th.sorted-asc::after { content: ' ↑'; opacity: 0.8; }
.sortable-table th.sorted-desc::after { content: ' ↓'; opacity: 0.8; }

/* ---- Starting Word Tester ---- */
.word-tester {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.word-tester__input {
  flex: 1;
  min-width: 200px;
}

.word-tester__result {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.tester-metric {
  text-align: center;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.tester-metric__value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-green-bright);
}

.tester-metric__label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* ---- Daily Hint Spoiler ---- */
.spoiler-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.spoiler-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--color-accent-glow);
}

.spoiler-answer {
  display: none;
  margin-top: var(--space-lg);
  text-align: center;
}

.spoiler-answer--visible {
  display: block;
  animation: fadeInUp 0.4s ease;
}

.spoiler-answer__word {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-green-bright);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Collapsible Sections ---- */
.collapsible {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
}

.collapsible__header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  border: none;
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.collapsible__header:hover { background: var(--color-surface-hover); }

.collapsible__icon {
  transition: transform var(--transition-base);
  font-size: 1.2rem;
}

.collapsible--open .collapsible__icon { transform: rotate(180deg); }

.collapsible__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.collapsible--open .collapsible__body {
  max-height: 2000px;
}

.collapsible__content {
  padding: var(--space-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---- Nav Dropdown ---- */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  min-width: 200px;
  box-shadow: var(--shadow-lg);
  z-index: 50;
  display: none;
}

.nav__dropdown:hover .nav__dropdown-menu {
  display: block;
}

.nav__dropdown-menu .nav__link {
  display: block;
  width: 100%;
}

/* ---- Archive Table ---- */
.archive-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.archive-table th {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
}

.archive-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.archive-table tr:hover td { background: var(--color-surface-hover); }

.archive-table .difficulty-easy { color: var(--color-green-bright); }
.archive-table .difficulty-medium { color: var(--color-yellow-bright); }
.archive-table .difficulty-hard { color: var(--color-error); }

/* ---- Share Results ---- */
.share-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
}

.share-grid {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  margin: var(--space-lg) 0;
}

.share-row {
  display: flex;
  gap: 4px;
}

.share-tile {
  width: 32px;
  height: 32px;
  border-radius: 4px;
}

.share-tile--green { background: var(--color-green); }
.share-tile--yellow { background: var(--color-yellow); }
.share-tile--gray { background: var(--color-gray); }

/* ---- Responsive additions ---- */
@media (max-width: 768px) {
  .suggestion-item__metrics {
    display: none;
  }

  .practice-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .heatmap-cell {
    height: 22px;
    font-size: 0.5rem;
  }

  .key-btn {
    min-width: 28px;
    height: 40px;
    font-size: 0.75rem;
  }

  .nav__dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding: 0 0 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  .practice-stats {
    grid-template-columns: 1fr 1fr;
  }

  .tester-metric {
    padding: var(--space-sm);
  }

  .tester-metric__value {
    font-size: 1rem;
  }
}

/* ---- Hero-Tool Above the Fold ---- */
.hero-tool {
  max-width: var(--max-width);
  margin: calc(var(--header-height) + var(--space-md)) auto 0;
  padding: var(--space-md) var(--space-xl) var(--space-xl);
}

.hero-tool__header {
  text-align: center;
  margin-bottom: var(--space-md);
}

.hero-tool__title {
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: var(--space-xs);
}

.hero-tool__desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.5;
}

.hero-tool__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin: var(--space-md) 0;
}

.hero-tool__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-tool__stat-val {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-green-bright);
}

.hero-tool__stat-lbl {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.hero-tool__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.hero-tool__input,
.hero-tool__results {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
}

.hero-tool__input-header,
.hero-tool__results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

@media (max-width: 768px) {
  .hero-tool {
    padding: var(--space-sm) var(--space-md) var(--space-md);
    margin-top: calc(var(--header-height) + var(--space-xs));
  }

  .hero-tool__title {
    font-size: 1.2rem;
  }

  .hero-tool__desc {
    font-size: 0.75rem;
  }

  .hero-tool__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .hero-tool__stats {
    gap: var(--space-md);
  }

  .hero-tool__stat-val {
    font-size: 1rem;
  }
}

/* ---- Content Sections ---- */
.content-section {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
}

/* ---- Algorithm Diagram ---- */
.algo-diagram {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: var(--space-sm);
  margin: var(--space-xl) auto;
  max-width: 1000px;
  flex-wrap: wrap;
}

.algo-step {
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  position: relative;
  transition: var(--transition-base);
}

.algo-step:hover {
  border-color: var(--color-green-bright);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-green);
}

.algo-step__number {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-green);
  color: white;
  font-size: 0.7rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.algo-step__icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.algo-step__title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.algo-step__desc {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.algo-arrow {
  font-size: 1.5rem;
  color: var(--color-green-bright);
  display: flex;
  align-items: center;
  padding-top: var(--space-xl);
}

@media (max-width: 768px) {
  .algo-diagram {
    flex-direction: column;
    align-items: center;
  }

  .algo-arrow {
    transform: rotate(90deg);
    padding: 0;
    margin: var(--space-xs) 0;
  }

  .algo-step {
    max-width: 300px;
    width: 100%;
  }
}

/* ---- Scoring Visual ---- */
.scoring-visual {
  max-width: 700px;
  margin: var(--space-xl) auto;
}

.scoring-visual__bar {
  display: flex;
  border-radius: var(--radius-full);
  overflow: hidden;
  height: 48px;
  border: 2px solid var(--color-border);
}

.scoring-visual__segment {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-xs);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.scoring-visual__segment:hover {
  filter: brightness(1.2);
}

.scoring-visual__segment-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: white;
}

.scoring-visual__segment-pct {
  font-size: 0.75rem;
  font-weight: 900;
  color: white;
}

.scoring-visual__segment--entropy {
  background: linear-gradient(135deg, var(--color-green) 0%, var(--color-green-bright) 100%);
}

.scoring-visual__segment--freq {
  background: linear-gradient(135deg, var(--color-yellow) 0%, var(--color-yellow-bright) 100%);
}

.scoring-visual__segment--unique {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
}

.scoring-visual__segment--solution {
  background: linear-gradient(135deg, #e879f9 0%, #c084fc 100%);
}

/* ---- Guess Flow Diagram ---- */
.guess-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin: var(--space-xl) auto;
  max-width: 800px;
  flex-wrap: wrap;
}

.guess-flow__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  min-width: 80px;
  transition: var(--transition-base);
}

.guess-flow__step:hover {
  transform: scale(1.05);
  border-color: var(--color-green-bright);
}

.guess-flow__step-icon {
  font-size: 1.8rem;
}

.guess-flow__step-text {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.guess-flow__step--start {
  border-color: var(--color-accent);
}

.guess-flow__step--color {
  border-color: var(--color-yellow);
}

.guess-flow__step--analyze {
  border-color: var(--color-green);
}

.guess-flow__step--result {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-glow-accent);
}

.guess-flow__step--win {
  border-color: var(--color-green-bright);
  box-shadow: var(--shadow-glow-green);
}

.guess-flow__arrow {
  font-size: 1.4rem;
  color: var(--color-green-bright);
  font-weight: 900;
}

@media (max-width: 580px) {
  .guess-flow {
    gap: var(--space-xs);
  }

  .guess-flow__step {
    padding: var(--space-sm);
    min-width: 56px;
  }

  .guess-flow__step-icon {
    font-size: 1.2rem;
  }

  .guess-flow__step-text {
    font-size: 0.55rem;
  }

  .guess-flow__arrow {
    font-size: 1rem;
  }

  .scoring-visual__segment-label {
    font-size: 0.5rem;
  }

  .scoring-visual__segment-pct {
    font-size: 0.6rem;
  }
}

/* ---- Print ---- */
@media print {

  .header,
  .footer,
  .theme-toggle,
  .mobile-toggle,
  .controls {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    border: 1px solid #ddd;
    page-break-inside: avoid;
  }
}