/* ============================================================
   Connect 4 — Web Stylesheet
   Matches the dark-theme aesthetic of the Pygame version
   ============================================================ */

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

:root {
  /* Palette — mirrors constants.py */
  --bg: #141624;
  --board: #1e3c96;
  --cell-empty: #0f111e;
  --player1: #e63946;
  /* machine — red  */
  --player2: #ffc832;
  /* human   — gold */
  --white: #ffffff;
  --light-gray: #b4b4c8;
  --accent: #648cff;
  --accent-hover: #82a5ff;
  --win: #32cd64;
  --lose: #e63946;
  --draw: #b4b4c8;
  --overlay: rgba(0, 0, 0, 0.75);

  /* Typography */
  --font: 'Inter', system-ui, -apple-system, sans-serif;

  /* Sizing */
  --sq: clamp(40px, calc((100vw - 40px) / 7), 85px);
  --radius: calc(var(--sq) / 2 - 5px);
  --header-h: 72px;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--white);
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* ============================================================
   Language Toggle
   ============================================================ */
.lang-toggle-bar {
  position: fixed;
  top: 16px;
  right: 20px;
  z-index: 150;
}

.btn-lang-toggle {
  background: rgba(30, 34, 55, 0.85);
  color: var(--white);
  border: 1.5px solid var(--accent);
  border-radius: 20px;
  padding: 6px 14px;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  backdrop-filter: blur(4px);
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}

.btn-lang-toggle:hover {
  background: rgba(60, 75, 125, 0.9);
  border-color: var(--accent-hover);
  transform: translateY(-1px);
}

/* ============================================================
   Screens
   ============================================================ */
.screen {
  display: none;
  width: 100%;
  height: 100dvh;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.screen.active {
  display: flex;
}

/* ============================================================
   Start Screen
   ============================================================ */
.start-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  animation: fadeIn 0.6s ease;
}

.title {
  font-size: clamp(3rem, 8vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -1px;
}

.title .accent {
  color: var(--accent);
}

.subtitle {
  color: var(--light-gray);
  font-size: 1.1rem;
  margin-top: -6px;
}

.divider {
  width: 100px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--player2));
  margin: 6px 0 10px;
}

.input-label {
  color: var(--light-gray);
  font-size: 0.95rem;
}

.nickname-input {
  width: min(300px, 80vw);
  padding: 12px 16px;
  font-size: 1.1rem;
  font-family: var(--font);
  color: var(--white);
  background: rgba(40, 44, 65, 0.8);
  border: 2px solid var(--accent);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  text-align: center;
}

.nickname-input::placeholder {
  color: rgba(180, 180, 200, 0.45);
}

.nickname-input:focus {
  border-color: var(--accent-hover);
  box-shadow: 0 0 20px rgba(100, 140, 255, 0.25);
}

.btn-primary {
  margin-top: 6px;
  width: min(200px, 60vw);
  padding: 14px 0;
  font-family: var(--font);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  background: var(--accent);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn-primary:disabled {
  background: rgba(60, 65, 90, 0.8);
  cursor: not-allowed;
  transform: none;
}

.btn-primary:not(:disabled):hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(100, 140, 255, 0.3);
}

.btn-primary:not(:disabled):active {
  transform: translateY(0);
}

.btn-leaderboard {
  margin-top: 4px;
  width: min(200px, 60vw);
  padding: 12px 0;
  font-family: var(--font);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  background: rgba(40, 50, 90, 0.9);
  border: 2px solid var(--accent);
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn-leaderboard:hover {
  background: rgba(60, 75, 125, 0.95);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(100, 140, 255, 0.25);
}

.btn-secondary {
  margin-top: 4px;
  width: min(140px, 45vw);
  padding: 9px 0;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--light-gray);
  background: transparent;
  border: 1.5px solid rgba(180, 180, 200, 0.3);
  border-radius: 10px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn-secondary:hover {
  color: var(--white);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(100, 140, 255, 0.15);
}

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

/* About modal content */
.about-card {
  max-width: 380px;
  padding-left: clamp(24px, 5vw, 40px);
  padding-right: clamp(24px, 5vw, 40px);
}

.about-text {
  color: var(--light-gray);
  font-size: 0.95rem;
  line-height: 1.65;
  text-align: center;
}

.about-author {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 2px;
}

.about-author a {
  color: inherit;
  text-decoration: none;
}

.about-author a:hover {
  text-decoration: underline;
}

/* ============================================================
   Game Screen
   ============================================================ */
.score-header {
  width: 100%;
  max-width: calc(var(--sq) * 7 + 20px);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 2px solid var(--accent);
  background: rgba(25, 28, 48, 0.95);
  border-radius: 12px 12px 0 0;
}

.score-side {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

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

.score-name {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.human-color {
  color: var(--player2);
}

.machine-color {
  color: var(--player1);
}

.score-number {
  font-size: 1.6rem;
  font-weight: 800;
}

.vs-label {
  color: var(--light-gray);
  font-size: 0.9rem;
  font-weight: 600;
}

.board-wrapper {
  background: var(--board);
  border-radius: 0 0 16px 16px;
  padding: 10px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  animation: fadeIn 0.4s ease;
}

#board-canvas {
  display: block;
  border-radius: 8px;
  cursor: pointer;
}

.turn-indicator {
  margin-top: 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--light-gray);
  min-height: 1.4em;
  transition: color 0.2s;
}

.turn-indicator.thinking {
  color: var(--player1);
}

/* ============================================================
   End-Game & Leaderboard Modals
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--overlay);
  backdrop-filter: blur(6px);
  z-index: 100;
}

.modal-overlay.visible {
  display: flex;
}

.modal-card {
  background: rgba(30, 34, 55, 0.97);
  border: 2px solid var(--accent);
  border-radius: 20px;
  padding: clamp(24px, 5vw, 40px) clamp(20px, 5vw, 48px);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  animation: scaleIn 0.35s ease;
  box-shadow: 0 12px 60px rgba(0, 0, 0, 0.6);
  max-width: calc(100vw - 32px);
}

.modal-result {
  font-size: 2.2rem;
  font-weight: 800;
}

.modal-result.win {
  color: var(--win);
}

.modal-result.lose {
  color: var(--lose);
}

.modal-result.draw {
  color: var(--draw);
}

.modal-scores {
  color: var(--light-gray);
  font-size: 1rem;
}

.modal-question {
  font-size: 1.1rem;
  margin-top: 4px;
}

.modal-buttons {
  display: flex;
  gap: 20px;
  margin-top: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-modal {
  width: 120px;
  padding: 12px 0;
  font-family: var(--font);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

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

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

.btn-yes {
  background: #28a046;
}

.btn-yes:hover {
  background: var(--win);
  box-shadow: 0 4px 18px rgba(50, 205, 100, 0.35);
}

.btn-no {
  background: #a02832;
}

.btn-no:hover {
  background: var(--lose);
  box-shadow: 0 4px 18px rgba(230, 57, 70, 0.35);
}

/* Leaderboard Modal Styling */
.leaderboard-card {
  width: min(560px, 92vw);
  padding: 28px 24px;
}

.leaderboard-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--white);
}

.table-container {
  width: 100%;
  max-height: 260px;
  overflow-y: auto;
  margin: 10px 0;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.leaderboard-table th {
  padding: 10px 12px;
  color: var(--light-gray);
  font-size: 0.85rem;
  font-weight: 700;
  border-bottom: 2px solid rgba(60, 65, 90, 0.8);
  text-transform: uppercase;
}

.leaderboard-table td {
  padding: 9px 12px;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(45, 50, 75, 0.5);
}

.leaderboard-table tr.user-row td {
  color: var(--accent);
  font-weight: 700;
  background: rgba(100, 140, 255, 0.12);
}

.leaderboard-footer {
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 4px;
  min-height: 1.2em;
}

.btn-close {
  width: min(140px, 40vw);
  padding: 10px 0;
  font-size: 1rem;
  margin-top: 6px;
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================================
   Responsive — small screens (phones)
   ============================================================ */
@media (max-width: 480px) {
  :root {
    --header-h: 56px;
  }

  .title {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .subtitle {
    font-size: 0.95rem;
  }

  .start-container {
    gap: 10px;
  }

  .score-header {
    padding: 0 10px;
  }

  .score-name {
    font-size: 0.72rem;
  }

  .score-number {
    font-size: 1.25rem;
  }

  .vs-label {
    font-size: 0.75rem;
  }

  .modal-result {
    font-size: 1.6rem;
  }

  .modal-scores {
    font-size: 0.85rem;
  }

  .modal-question {
    font-size: 0.95rem;
  }

  .btn-modal {
    width: 100px;
    padding: 10px 0;
    font-size: 0.95rem;
  }
}