/* This file was made by Bernat and Pol.  */

/* =====================================================
   COLOR VARIABLES - Easy theme customization
   ===================================================== */
:root {
    --board-bg: #0d47a1;      /* Dark blue for board background */
    --cell-bg: #1976d2;       /* Lighter blue for cells */
    --slot-bg: #e3f2fd;       /* Very light blue for empty slots */
    --panel-bg: #ffffff;      /* White panels */
    --accent: #ffb300;        /* Yellow accent color */
  }
  
  /* =====================================================
     BODY & MAIN LAYOUT
     ===================================================== */
  body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background: linear-gradient(180deg, #e8f0ff 0%, #ffffff 100%); 
    display: flex;
    align-items: flex-start;
    justify-content: center;
    min-height: 100vh;
    padding: 24px;
    box-sizing: border-box;
  }
  
  /* Main container - two column layout */
  .container {
    width: 920px;
    max-width: 95vw;
    display: grid;
    grid-template-columns: 320px 1fr; /* Left panel fixed, right panel flexible */
    gap: 20px;
    align-items: start;
  }
  
  /* =====================================================
     LEFT PANEL - Settings & Scores
     ===================================================== */
  .panel {
    background: var(--panel-bg);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 6px 20px rgba(13, 47, 77, 0.08); /* Soft shadow for depth */
  }
  
  .heading {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  
  h1 {
    margin: 0;
    font-size: 20px;
  }
  
  /* Score display area */
  .score {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .player-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
  }
  
  .player-info {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  
  /* Small circular color indicator for each player */
  .color-swatch {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  }
  
  .controls {
    display: flex;
    gap: 8px;
    margin-top: 12px;
  }
  
  /* Generic button styles */
  button {
    border: 0;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
  }
  
  .btn-primary {
    background: var(--board-bg);
    color: white;
  }
  
  .btn-ghost {
    background: transparent;
    border: 1px solid #ddd;
  }
  
  /* =====================================================
     BOARD AREA - Right Panel
     ===================================================== */
  .board-wrap {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }
  
  .top-controls {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .message {
    font-weight: 600;
  }
  
  /* The actual game board grid */
  .board {
    background: var(--board-bg);
    padding: 12px;
    border-radius: 12px;
    display: grid;
    grid-template-columns: repeat(7, 72px); /* 7 columns for Connect Four */
    gap: 8px;
    box-sizing: border-box;
  }
  
  /* Clickable arrows at the top of each column */
  .col-indicator {
    height: 22px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: rgba(255, 255, 255, 0.9);
    font-size: 12px;
    cursor: pointer;
    user-select: none; /* Prevent text selection when clicking */
  }
  
  /* Individual cell on the board */
  .cell {
    width: 72px;
    height: 72px;
    background: var(--cell-bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
  }
  
  /* The circular slot inside each cell */
  .slot {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--slot-bg);
    box-shadow: inset 0 -6px 14px rgba(0, 0, 0, 0.08); /* Inner shadow for depth */
    transition: background 200ms ease, transform 200ms ease;
  }
  
  /* The disc that gets dropped into slots */
  .disc {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    transform: scale(0); /* Start invisible */
    transition: transform 220ms cubic-bezier(.2, .9, .3, 1); /* Bouncy animation */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  }
  
  /* Show the disc with scale animation */
  .disc.show {
    transform: scale(1);
  }
  
  /* Highlight winning discs with a glow effect */
  .highlight {
    box-shadow: 0 0 0 6px rgba(255, 235, 59, 0.06) inset, 0 10px 30px rgba(0, 0, 0, 0.18);
  }
  
  /* Add outline to board when someone wins */
  .winner {
    outline: 4px solid rgba(255, 235, 59, 0.28);
    border-radius: 8px;
  }
  
  /* =====================================================
     MAIN MENU BUTTONS - Colorful gradient buttons
     ===================================================== */
  .main-buttons {
    width: 100%;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-top: 16px;
  }

  .main-buttons button {
    flex: 1;
    padding: 12px 16px;
    border-radius: 10px;
    border: none;
    color: white;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    text-shadow: 0 1px 1px rgba(0,0,0,0.3);
  }

  /* Left button - yellow/orange gradient (New Round) */
  .btn-left {
    background: linear-gradient(135deg, #f6d365, #fda085);
    box-shadow: 0 4px 10px rgba(253,160,133,0.4);
  }
  .btn-left:hover {
    transform: translateY(-2px); /* Lift up on hover */
    box-shadow: 0 6px 14px rgba(253,160,133,0.55);
  }

  /* Center button - blue gradient (Start/Apply) */
  .btn-center {
    flex: 1.4;
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    box-shadow: 0 4px 12px rgba(79,172,254,0.4);
    font-size: 17px;
    padding: 14px 18px;
  }
  .btn-center:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 18px rgba(79,172,254,0.55);
  }

  /* Right button - red gradient for the Reset Scores */
  .btn-right {
    background: linear-gradient(135deg, #ff6b6b, #ff4757);
    box-shadow: 0 4px 10px rgba(255,107,107,0.4);
  }
  .btn-right:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(255,107,107,0.55);
  }

  /* Mobile: stack buttons vertically */
  @media (max-width: 600px) {
    .main-buttons {
      flex-direction: column;
    }
    
    .btn-center {
      flex: none;
      width: 100%;
    }
  }

  /* =====================================================
     UNDO BUTTON - Purple gradient
     ===================================================== */
  .undo-btn {
    background: linear-gradient(135deg, #9b5cff, #7f39fb);
    color: white;
    font-weight: 700;
    padding: 10px 18px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
    box-shadow: 0 4px 10px rgba(155, 92, 255, 0.35);
  }

  .undo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(127, 57, 251, 0.55);
  }

  .undo-btn:active {
    transform: translateY(0px); /* Press down effect */
    box-shadow: 0 3px 8px rgba(127, 57, 251, 0.35);
  }

  /* Mobile-friendly undo button */
  @media (max-width: 600px) {
    .undo-btn {
      width: 100%;
      text-align: center;
      margin-top: 10px;
      padding: 12px;
    }
  }
  
  /* =====================================================
     SETUP SECTION - Player inputs
     ===================================================== */
  .setup {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
  }
  
  label {
    font-size: 13px;
    color: #333;
  }
  
  input[type="text"] {
    padding: 8px;
    border-radius: 8px;
    border: 1px solid #ddd;
    width: 100%;
    box-sizing: border-box;
  }
  
  input[type="color"] {
    width: 48px;
    height: 36px;
    padding: 0;
    border: 0;
    background: transparent;
  }
  
  footer.small {
    font-size: 12px;
    color: #666;
    margin-top: 10px;
  }
  
  /* Basic responsive adjustments for tablets */
  @media (max-width: 900px) {
    .container {
      grid-template-columns: 1fr; /* Single column on small screens */
    }
    .board {
      grid-template-columns: repeat(7, 10vw);
    }
    .cell {
      width: 10vw;
      height: 10vw;
    }
    .slot,
    .disc {
      width: 8.25vw;
      height: 8.25vw;
    }
  }

  /* =====================================================
     GAME MODE SELECTOR
     ===================================================== */
  .divider {
    margin: 8px 0;
    border: 0;
    height: 1px;
    background: #e0e0e0;
  }

  .gamemode-section {
    margin-top: 6px;
    padding: 10px;
    background: #fafafa;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  }

  .gamemode-section h3 {
    margin: 0 0 12px;
    font-size: 16px;
  }

  .gamemode-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.15s ease;
  }

  .gamemode-option:hover {
    background: #f0f0f0; /* Subtle highlight on hover */
  }

  .gamemode-option input[type="radio"] {
    accent-color: #4facfe; /* Match blue theme */
  }

  .gamemode-option span {
    font-size: 14px;
    font-weight: 600;
  }

  /* =====================================================
     RAINBOW BLOCKER DISC (Random Chaos Mode)
     Animated gradient that cycles through rainbow colors
     ===================================================== */
  .disc.blocker {
    background: linear-gradient(
      135deg,
      #ff0000 0%,
      #ff7f00 12%,
      #ffff00 25%,
      #00ff00 37%,
      #00ffff 50%,
      #0000ff 62%,
      #8b00ff 75%,
      #ff00ff 87%,
      #ff0000 100%
    );
    background-size: 300% 300%; /* Large background for animation */
    animation: rainbow-shift 2.5s ease infinite;
    border: 3px solid rgba(255, 255, 255, 0.8);
    box-shadow: 
      0 0 20px rgba(255, 255, 255, 0.6),
      inset 0 0 15px rgba(255, 255, 255, 0.4),
      0 6px 16px rgba(0, 0, 0, 0.3);
  }

  /* Animation that moves the gradient and pulses brightness */
  @keyframes rainbow-shift {
    0% {
      background-position: 0% 50%;
      filter: brightness(1) saturate(1.2);
    }
    50% {
      background-position: 100% 50%;
      filter: brightness(1.15) saturate(1.4);
    }
    100% {
      background-position: 0% 50%;
      filter: brightness(1) saturate(1.2);
    }
  }

  /* ================================================================
     RESPONSIVE DESIGN (Mobile, Tablet and Desktop)
     We tried to make it work on any screen size!
     ================================================================ */

  /* --- Tablet & Small Desktop (max-width: 1000px) --- */
  @media (max-width: 1000px) {
    .container {
      grid-template-columns: 1fr;
      width: 100%;
    }

    .panel {
      width: 100%;
    }

    .board {
      grid-template-columns: repeat(7, minmax(50px, 1fr));
      gap: 6px;
      padding: 10px;
    }

    .cell {
      width: 9vw;
      height: 9vw;
    }

    .slot, .disc {
      width: 7vw;
      height: 7vw;
    }

    .main-buttons {
      flex-direction: row;
    }
  }

  /* --- Big Phones / Small Tablets (max-width: 700px) --- */
  @media (max-width: 700px) {
    body {
      padding: 12px;
    }

    h1 {
      font-size: 22px;
    }

    .heading {
      flex-direction: column;
      text-align: center;
    }

    .main-buttons {
      flex-direction: column;
      gap: 10px;
    }

    .btn-center {
      font-size: 16px;
      padding: 12px;
    }

    .board {
      grid-template-columns: repeat(7, minmax(40px, 1fr));
      padding: 8px;
    }

    .cell {
      width: 11vw;
      height: 11vw;
    }

    .slot, .disc {
      width: 9vw;
      height: 9vw;
    }
  }

  /* --- Small Phones (max-width: 480px) --- */
  @media (max-width: 480px) {
    h1 {
      font-size: 20px;
    }

    .setup label {
      font-size: 12px;
    }

    input[type="text"] {
      font-size: 14px;
    }

    .message {
      font-size: 14px;
    }

    .board {
      grid-template-columns: repeat(7, 1fr);
      gap: 5px;
      padding: 6px;
    }

    .cell {
      width: 12vw;
      height: 12vw;
    }

    .slot, .disc {
      width: 10vw;
      height: 10vw;
    }

    .btn-center {
      font-size: 15px;
      padding: 12px;
    }

    .btn-left, .btn-right {
      font-size: 14px;
    }
  }

  /* --- Extremely Small devices (max-width: 360px) --- */
  @media (max-width: 360px) {
    .cell {
      width: 13vw;
      height: 13vw;
    }

    .slot, .disc {
      width: 11vw;
      height: 11vw;
    }

    .main-buttons button {
      font-size: 14px;
      padding: 10px;
    }
  }