:root {
  /* Exact Theme Colors from concepto/src/constants/colors.ts (Colors.dark) */
  --color-bg: #0F172A;
  --color-bg-secondary: #1E293B;
  --color-bg-tertiary: #334155;
  --color-card: #334155;
  --color-input-bg: #1E293B;
  --color-text: #F8FAFC;
  --color-text-secondary: #CBD5E1;
  --color-text-tertiary: #94A3B8;
  --color-text-quaternary: #64748B;
  --color-border: #334155;
  --color-border-strong: #475569;
  --color-separator: #1E293B;
  
  --color-daily: #818CF8;
  --color-infinite: #14B8A6;
  
  --color-success-bg: #064E3B;
  --color-success-border: #34D399;
  --color-success-text: #34D399;
  --color-error: #F87171;
  
  /* Temperature Colors */
  --temp-boiling: #EF4444;
  --temp-hot: #F97316;
  --temp-warm: #F59E0B;
  --temp-cold: #3B82F6;
  --temp-frozen: #9CA3AF;
  
  --primary-btn-text: #FFFFFF;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-content-width: 600px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  overflow-x: hidden;
}

#root-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: var(--max-content-width);
  margin: 0 auto;
  position: relative;
  background-color: var(--color-bg);
}

/* ==========================================================================
   GAME HEADER (Visible in Active Game Mode, Hidden in Hero Mode)
   ========================================================================== */
.game-header {
  padding: 14px 16px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.game-header.hero-mode {
  display: none;
}

.header-left {
  display: flex;
  align-items: center;
  width: 100px;
}

.header-date-pill {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 6px;
  background-color: var(--color-bg-secondary);
  padding: 6px 10px;
  border-radius: 12px;
  color: var(--color-text-secondary);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.header-date-icon {
  font-size: 15px;
  color: var(--color-daily);
}

.header-brand-container {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  flex: 1;
}

.brand-title {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: 5px;
  color: var(--color-text);
  text-transform: uppercase;
  line-height: 1;
  text-align: center;
}

.header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: 100px;
}

.icon-button {
  background: var(--color-bg-secondary);
  border: none;
  color: var(--color-text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 22px;
  padding: 0;
  line-height: 1;
  transition: all 0.15s ease;
}

.icon-button:hover {
  background: var(--color-card);
  color: var(--color-text);
}

/* ==========================================================================
   GAME VIEWPORT & HISTORY STREAM
   ========================================================================== */
.game-viewport {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.history-scroll-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px 16px 12px 16px;
  -webkit-overflow-scrolling: touch;
}

.history-scroll-container::-webkit-scrollbar {
  width: 4px;
}

.history-scroll-container::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

/* History Card Row (Grows Downwards) */
.history-row {
  display: flex;
  flex-direction: row;
  margin-bottom: 6px;
  position: relative;
}

.history-row.perfect-row {
  margin-bottom: 8px;
}

.spine-wrapper {
  width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
}

.spine-line {
  position: absolute;
  width: 2px;
  background-color: var(--color-border-strong);
  top: 0;
  bottom: -6px;
  left: 11px;
}

.history-row:first-child .spine-line {
  top: 30%;
}

.history-row:last-child .spine-line {
  height: 30%;
  bottom: auto;
}

.main-node {
  width: 14px;
  height: 14px;
  border-radius: 7px;
  border: 2px solid var(--color-bg);
  position: absolute;
  left: 5px;
  top: 11px;
  z-index: 2;
}

.modal-box .main-node {
  border-color: var(--color-bg-secondary);
}

.history-row.perfect-row .main-node {
  top: 18px;
}

.card-container {
  flex: 1;
  border-radius: 16px;
  padding: 6px 12px;
  margin-left: 8px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border-strong);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

.card-container.perfect {
  background-color: var(--color-success-bg);
  border-color: var(--color-success-border);
  padding-top: 10px;
  padding-bottom: 10px;
}

.card-top-row {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  height: 22px;
  margin-bottom: 1px;
}

.card-top-row.perfect-top {
  height: 28px;
  margin-bottom: 4px;
}

.card-word-text {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.5px;
  color: var(--color-text);
  text-transform: uppercase;
}

.target-node {
  width: 24px;
  height: 24px;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
}

.target-mark {
  font-size: 11px;
  font-weight: 900;
}

.win-icon-decagram {
  font-size: 28px;
  color: var(--color-success-text);
  line-height: 1;
}

/* Horizontal Bridge Path */
.path-area {
  height: 26px;
  margin-top: 0;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.connectors {
  position: absolute;
  top: 0;
  left: 4px;
  right: 14px;
  bottom: 50%;
  display: flex;
  flex-direction: row;
}

.arm {
  flex: 1;
  border-bottom-width: 2px;
  border-bottom-style: solid;
}

.arm-left {
  border-left-width: 2px;
  border-left-style: solid;
  border-bottom-left-radius: 16px;
}

.arm-right {
  border-right-width: 2px;
  border-right-style: solid;
  border-bottom-right-radius: 16px;
}

.bridge-container {
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.bridge-pill {
  display: flex;
  flex-direction: row;
  align-items: center;
  padding: 2px 10px;
  border-radius: 10px;
  border-width: 1.5px;
  border-style: solid;
  background-color: var(--color-card);
  gap: 6px;
}

.bridge-icon {
  font-size: 16px;
  line-height: 1;
}

.bridge-value {
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

/* Card Footer Meter */
.card-footer {
  margin-top: 1px;
}

.meter-header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2px;
}

.status-label {
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.percentage-text {
  font-size: 10px;
  font-weight: 800;
  color: var(--color-text-tertiary);
}

.meter-track {
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  background-color: var(--color-input-bg);
}

.meter-fill {
  height: 100%;
  border-radius: 3px;
}

/* ==========================================================================
   GAME PROGRESS BAR (16px margins matching input container)
   ========================================================================== */
.game-progress-bar-container {
  margin: 0 16px 8px 16px;
  padding: 12px 16px 10px;
  border-radius: 16px;
  background-color: var(--color-bg-secondary);
  border: none;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.progress-content-column {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.progress-labels-row {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.progress-values-row {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.progress-col {
  flex: 1;
}

.progress-col.right-align {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.progress-label-text {
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.5px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.progress-value-text {
  font-size: 16px;
  font-weight: 900;
  color: var(--color-text);
  text-transform: uppercase;
}

.best-value-wrapper {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 5px;
}

.progress-percentage-text {
  font-size: 13px;
  font-weight: 900;
  color: var(--color-text);
}

.progress-heat-line {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
}

/* ==========================================================================
   NEW PUZZLE READY BANNER (Option 2 Midnight Rollover)
   ========================================================================== */
.new-puzzle-banner {
  margin: 0 16px 8px 16px;
  padding: 10px 16px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(129, 140, 248, 0.2) 0%, rgba(20, 184, 166, 0.2) 100%);
  border: 1px solid rgba(129, 140, 248, 0.4);
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  animation: fadeInSlide 0.3s ease;
}

@keyframes fadeInSlide {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.new-puzzle-banner-text {
  font-size: 12px;
  font-weight: 800;
  color: #F8FAFC;
  display: flex;
  align-items: center;
  gap: 6px;
}

.new-puzzle-action-btn {
  background-color: var(--color-daily);
  color: #FFFFFF;
  border: none;
  border-radius: 10px;
  padding: 6px 14px;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: opacity 0.15s ease;
  flex-shrink: 0;
}

.new-puzzle-action-btn:hover {
  opacity: 0.9;
}

/* ==========================================================================
   GAME INPUT SECTION
   ========================================================================== */
.game-input-section {
  padding-left: 16px;
  padding-right: 16px;
  padding-top: 8px;
  padding-bottom: 12px;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
  flex-shrink: 0;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.game-input-section.no-border-top {
  border-top-width: 0;
}

/* Centered Initial Hero State when 0 guesses */
.game-input-section.centered-hero-mode {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border-top: none;
  padding: 20px 16px 40px;
}

.game-input-inner {
  width: 100%;
  display: flex;
  flex-direction: column;
}

.game-input-section.centered-hero-mode .game-input-inner {
  max-width: 520px;
}

/* Hero Brand Stack (Center Hero on 0 Guesses) */
.hero-brand-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin-bottom: 24px;
}

.hero-brand-icon {
  width: 68px;
  height: 68px;
  border-radius: 18px;
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08);
  margin-bottom: 14px;
}

.hero-brand-title {
  font-size: 40px;
  font-weight: 900;
  letter-spacing: 7px;
  color: #FFFFFF;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: 8px;
}

.hero-brand-subtitle-row {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.hero-brand-subtitle {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--color-daily);
  text-transform: uppercase;
}

.hero-howto-btn {
  background: var(--color-bg-secondary);
  border: none;
  color: var(--color-text-secondary);
  width: 28px;
  height: 28px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  padding: 0;
  margin: 0;
  line-height: 1;
  transition: all 0.15s ease;
}

.hero-howto-btn:hover {
  background: var(--color-card);
  color: #FFFFFF;
}

.input-error-text {
  font-size: 11px;
  font-weight: 900;
  margin-bottom: 8px;
  text-align: center;
  letter-spacing: 0.5px;
  color: var(--color-error);
  text-transform: uppercase;
  min-height: 14px;
}

.starter-section {
  margin-bottom: 8px;
  width: 100%;
}

.starter-header-row {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  margin-bottom: 10px;
  gap: 6px;
  width: 100%;
}

.starter-header-text {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1px;
  text-align: center;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.starter-shuffle-btn {
  padding: 2px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-daily);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.starter-shuffle-btn:hover {
  opacity: 0.8;
}

.starter-row {
  display: flex;
  flex-direction: row;
  gap: 10px;
  width: 100%;
  margin-bottom: 14px;
}

.starter-chip {
  flex: 1;
  height: 48px;
  border-radius: 24px;
  border: 2px solid var(--color-daily);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  font-family: inherit;
}

.starter-chip:hover {
  background-color: var(--color-daily);
}

.starter-chip:hover .starter-chip-text {
  color: var(--primary-btn-text);
}

.starter-chip-text {
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.8px;
  color: var(--color-daily);
  text-transform: uppercase;
}

.divisor-container {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 12px;
  margin-top: 2px;
  margin-bottom: 14px;
}

.divisor-line {
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

.divisor-text {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.input-wrapper {
  display: flex;
  flex-direction: row;
  align-items: center;
  border-radius: 18px;
  padding: 4px;
  background-color: var(--color-input-bg);
  width: 100%;
}

.native-text-input {
  flex: 1;
  height: 58px;
  padding-left: 16px;
  padding-right: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  background: transparent;
  border: none;
  outline: none;
  font-family: inherit;
  text-transform: uppercase;
}

.native-text-input::placeholder {
  color: var(--color-text-tertiary);
}

.hint-action-btn {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-left: 2px;
  margin-right: 6px;
  background-color: var(--color-daily);
  border: none;
  cursor: pointer;
  color: var(--primary-btn-text);
  font-family: inherit;
  gap: 1px;
}

.hint-action-btn:hover {
  opacity: 0.9;
}

.hint-action-icon {
  font-size: 20px;
  line-height: 1;
}

.hint-action-label {
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.5px;
}

.submit-action-btn {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 4px;
  background-color: var(--color-daily);
  border: none;
  cursor: pointer;
  color: var(--primary-btn-text);
  font-size: 24px;
}

.submit-action-btn:hover {
  opacity: 0.9;
}

.submit-action-btn:disabled {
  background-color: #9CA3AF;
  cursor: not-allowed;
}

/* ==========================================================================
   COMPLETED VICTORY STATE (Generous Spacing & Prominent Stacked Timer)
   ========================================================================== */
.completed-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding-top: 10px;
  padding-bottom: 12px;
  gap: 12px;
}

.countdown-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  margin-bottom: 4px;
}

.countdown-label {
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 1.5px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.countdown-timer {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 2px;
  color: var(--color-daily);
}

.modal-word-text {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: 2.5px;
  color: var(--color-text);
  text-transform: uppercase;
  line-height: 1.1;
  margin-bottom: 2px;
}

.journey-map {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
  margin-bottom: 4px;
  padding: 0;
  max-width: 100%;
}

.journey-dot {
  width: 16px;
  height: 16px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
  flex-shrink: 0;
}

.modal-stats-text {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 1.5px;
  color: var(--color-text);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.full-share-button {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  height: 54px;
  border-radius: 16px;
  width: 100%;
  border: none;
  cursor: pointer;
  font-family: inherit;
  color: #FFF;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 1px;
  gap: 8px;
  transition: all 0.15s ease;
}

.full-share-button:hover {
  opacity: 0.9;
}

/* ==========================================================================
   SITE FOOTER & STORE BADGES (Prominent & Balanced)
   ========================================================================== */
.app-footer {
  padding: 16px 16px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  background-color: var(--color-bg);
  flex-shrink: 0;
}

.store-badges-container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: 14px;
}

.store-badge-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, opacity 0.15s ease;
  height: 48px;
}

.store-badge-link:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.store-badge-img {
  height: 48px;
  width: auto;
  border-radius: 8px;
}

.apple-badge {
  height: 48px;
}

.google-badge {
  height: 68px; /* Google Play badge has inherent transparent padding */
  margin: -10px 0;
}

.footer-links {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--color-text-quaternary);
}

.footer-links a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-sep {
  opacity: 0.5;
}

/* Toast Message */
.toast-banner {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background-color: var(--color-daily);
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 2000;
}

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

/* ==========================================================================
   HOW TO PLAY MODAL
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 1000;
  display: none;
}

.modal-backdrop.open {
  display: flex;
}

.modal-box {
  background-color: var(--color-bg-secondary);
  border: none;
  border-radius: 24px;
  width: 100%;
  max-width: 520px;
  max-height: 94vh;
  overflow-y: auto;
  padding: 28px 22px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.8);
}

.modal-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.modal-box-title {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 0.5px;
  color: #FFFFFF;
}

.modal-close-btn {
  width: 36px;
  height: 36px;
  border-radius: 18px;
  background-color: var(--color-card);
  border: none;
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  margin: 0;
  line-height: 1;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.modal-close-btn i {
  font-size: 20px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close-btn:hover {
  background-color: var(--color-bg-tertiary);
  color: #FFFFFF;
}

.modal-intro-text {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.5;
  margin-bottom: 22px;
}

.tutorial-cards-flow {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 20px;
}

.tutorial-step-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tutorial-step-header {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.tutorial-step-caption {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  padding-left: 2px;
}

.tutorial-step-caption strong {
  color: #FFFFFF;
  font-weight: 800;
}