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

:root {
  --color-bg: #121213;
  --color-surface: #1a1a1b;
  --color-border-empty: #3a3a3c;
  --color-border-filled: #565758;
  --color-correct: #538d4e;
  --color-present: #b59f3b;
  --color-absent: #3a3a3c;
  --color-text: #ffffff;
  --color-text-secondary: #818384;
  --color-key-bg: #818384;
  --color-modal-backdrop: rgba(0, 0, 0, 0.7);
  --tile-size: 62px;
  --tile-gap: 5px;
  --tile-font: 2rem;
  --key-height: 58px;
  --key-width: 43px;
  --key-gap: 6px;
  --key-font: 0.85rem;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ===== Header ===== */
header {
  width: 100%;
  max-width: 500px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border-empty);
  flex-shrink: 0;
}

.game-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
}

.header-left, .header-right {
  min-width: 80px;
}

.header-right {
  text-align: right;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.85rem;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.nav-link:hover {
  opacity: 1;
  text-decoration: underline;
}

.player-name {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ===== Main Layout ===== */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  flex-grow: 1;
  width: 100%;
  max-width: 500px;
  overflow: hidden;
}

/* ===== Game Board ===== */
.game-board {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--tile-gap);
  padding: 20px 0 10px;
  flex-shrink: 0;
}

.board-row {
  display: flex;
  gap: var(--tile-gap);
}

.tile {
  width: var(--tile-size);
  height: var(--tile-size);
  border: 2px solid var(--color-border-empty);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--tile-font);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text);
  user-select: none;
  transition: border-color 0.1s;
  perspective: 400px;
}

.tile .tile-inner {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Tile filled (letter typed but not submitted) */
.tile[data-state="tbd"] {
  border-color: var(--color-border-filled);
  animation: pop 0.1s ease;
}

/* Tile states after reveal */
.tile[data-state="correct"] {
  background-color: var(--color-correct);
  border: none;
}

.tile[data-state="present"] {
  background-color: var(--color-present);
  border: none;
}

.tile[data-state="absent"] {
  background-color: var(--color-absent);
  border: none;
}

/* ===== Animations ===== */
@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.12); }
  100% { transform: scale(1); }
}

@keyframes flipIn {
  0% { transform: rotateX(0deg); }
  50% { transform: rotateX(-90deg); }
  100% { transform: rotateX(0deg); }
}

.tile.flip {
  animation: flipIn 0.5s ease forwards;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-6px); }
  40%, 60% { transform: translateX(6px); }
}

.board-row.shake {
  animation: shake 0.5s ease;
}

@keyframes bounce {
  0%, 20% { transform: translateY(0); }
  40% { transform: translateY(-30px); }
  50% { transform: translateY(5px); }
  60% { transform: translateY(-15px); }
  80% { transform: translateY(2px); }
  100% { transform: translateY(0); }
}

.tile.bounce {
  animation: bounce 1s ease;
}

/* ===== Message Area ===== */
.message-area {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  flex-shrink: 0;
}

.btn-primary {
  background-color: var(--color-correct);
  color: var(--color-text);
  border: none;
  border-radius: 4px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.9;
}

.new-word-btn {
  font-size: 1.1rem;
  padding: 14px 32px;
}

/* ===== Keyboard ===== */
.keyboard {
  width: 100%;
  max-width: 500px;
  padding: 0 8px 8px;
  flex-shrink: 0;
}

.keyboard-row {
  display: flex;
  justify-content: center;
  gap: var(--key-gap);
  margin-bottom: 6px;
}

.spacer-half {
  flex: 0.5;
}

.key {
  width: var(--key-width);
  height: var(--key-height);
  border: none;
  border-radius: 4px;
  background-color: var(--color-key-bg);
  color: var(--color-text);
  font-size: var(--key-font);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.2s;
  text-transform: uppercase;
  flex-grow: 0;
  flex-shrink: 0;
}

.key:active {
  opacity: 0.8;
}

.key-wide {
  width: 65px;
  font-size: 0.75rem;
}

.key[data-state="correct"] {
  background-color: var(--color-correct);
}

.key[data-state="present"] {
  background-color: var(--color-present);
}

.key[data-state="absent"] {
  background-color: var(--color-absent);
}

/* ===== Toast Notifications ===== */
.toast-container {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background-color: var(--color-text);
  color: var(--color-bg);
  padding: 12px 20px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  animation: fadeIn 0.3s ease;
  pointer-events: auto;
  text-align: center;
  min-width: 150px;
}

.toast.fade-out {
  animation: fadeOut 0.3s ease forwards;
}

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

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

/* ===== Registration Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-empty);
  border-radius: 8px;
  padding: 40px 32px;
  text-align: center;
  max-width: 400px;
  width: 90%;
}

.modal-content h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.modal-content p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.modal-content input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border-empty);
  border-radius: 4px;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  margin-bottom: 16px;
  outline: none;
  transition: border-color 0.2s;
}

.modal-content input:focus {
  border-color: var(--color-border-filled);
}

.modal-content .btn-primary {
  width: 100%;
  padding: 14px;
  font-size: 1.05rem;
}

/* ===== Leaderboard Page ===== */
.leaderboard-page {
  overflow-y: auto;
}

.leaderboard-page main {
  overflow: visible;
}

.leaderboard-main {
  width: 100%;
  max-width: 960px;
  padding: 20px 16px 40px;
}

.leaderboard-page header {
  max-width: 960px;
}

.leaderboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.leaderboard-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-empty);
  border-radius: 8px;
  padding: 20px;
}

.section-title {
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.section-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.table-wrapper {
  overflow-x: auto;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.leaderboard-table th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 2px solid var(--color-border-empty);
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.leaderboard-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border-empty);
  white-space: nowrap;
}

.leaderboard-table tbody tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.03);
}

.leaderboard-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.06);
}

.empty-message {
  text-align: center;
  color: var(--color-text-secondary);
  padding: 20px !important;
}

/* Personal Stats */
.personal-stats-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-empty);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
}

.personal-stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  min-width: 80px;
  max-width: 120px;
  padding: 12px 8px;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 900px) {
  :root {
    --tile-size: 58px;
    --tile-font: 1.8rem;
    --key-height: 54px;
    --key-width: 40px;
    --key-gap: 5px;
  }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 600px) {
  :root {
    --tile-size: 52px;
    --tile-font: 1.6rem;
    --tile-gap: 4px;
    --key-height: 50px;
    --key-width: 32px;
    --key-gap: 4px;
    --key-font: 0.7rem;
  }

  .game-title {
    font-size: 1.2rem;
  }

  .header-left, .header-right {
    min-width: 60px;
  }

  .nav-link {
    font-size: 0.75rem;
  }

  .key-wide {
    width: 50px;
    font-size: 0.65rem;
  }

  .keyboard {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-bg);
    padding: 6px 4px;
    z-index: 100;
  }

  main {
    padding-bottom: 180px;
  }

  .game-board {
    padding: 10px 0 5px;
  }

  /* Leaderboard mobile */
  .leaderboard-grid {
    grid-template-columns: 1fr;
  }

  .leaderboard-table {
    font-size: 0.8rem;
  }

  .leaderboard-table th,
  .leaderboard-table td {
    padding: 8px;
  }

  .stat-value {
    font-size: 1.5rem;
  }
}

/* Very small screens */
@media (max-width: 380px) {
  :root {
    --tile-size: 46px;
    --tile-font: 1.4rem;
    --key-width: 28px;
    --key-height: 46px;
    --key-gap: 3px;
    --key-font: 0.65rem;
  }

  .key-wide {
    width: 44px;
  }
}