/* ==========================================================================
base.css — Global Styles & Variables
Description: Defines root variables, resets, base styles, and utilities.
Author: Sai Manas Pandrangi (Research Assistant)

University: University of British Columbia
Lab: Collaborative Digital Heritage Studio (CoDHerS)
Team: CoDHerS Research Assistant Team
Created: 2025-06-08
Updated: 2025-06-22
========================================================================== */

/* ==========================================================================
Root Variables
========================================================================== */

:root {
    --color-primary-1: #121212;  /* Light charcoal */
    --color-primary-2: #fbf0de;  /* Background beige */
    --color-primary-3: #a3bad4;  /* Soft blue */
    --color-primary-4: #df6732;  /* Accent orange */
    --color-primary-5: #6d7f33;  /* Olive green */
  
    --color-secondary-1: #446a7c;  /* Blue-grey */
    --color-secondary-2: #5a6391;  /* Slate blue */
    --color-secondary-3: #b9bbc1;  /* Light grey */
    --color-secondary-4: #c23d37;  /* Red-orange */
    --color-secondary-5: #ef9606;  /* Amber */
    --color-secondary-6: #52593a;  /* Olive green */
    --color-secondary-7: #dde4b9;  /* Light green */
  
    --font-base: 'Comfortaa', sans-serif;
    --font-color-base: #ffffff;  /* white */
    --font-color-footer: #888888; /* grey */
    --font-size-base: 16px;
    --border-radius: 0.25rem;
  }
  
  /* ==========================================================================
  Reset & Box Sizing
  ========================================================================== */
  
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  /* ==========================================================================
  Base Styles
  ========================================================================== */
  
  body {
    background-color: var(--color-primary-1);
    padding: 1rem;
  
    font-family: var(--font-base);
    font-size: var(--font-size-base);
    color: var(--font-color-base);
    line-height: 1.5;

    overflow-y: hidden;
  }
  
  /* ==========================================================================
  Typography Styles
  ========================================================================== */
  
  h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5rem;
    font-weight: 600;
  }
  
  a {
    color: var(--color-primary-4);
    text-decoration: none;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  /* ==========================================================================
  Component Classes
  ========================================================================== */
  
  /* Buttons */
  button, .btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
  
    background: linear-gradient(135deg, #dd9e73, #98613c);
    color: var(--font-color-base);
  
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.03em;
    text-align: center;
    text-decoration: none;
  
    box-shadow: 0 4px 8px rgba(223, 103, 50, 0.4);
  
    transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.15s ease;
    user-select: none;
  }
  
  button:hover, .btn:hover,
  button:focus-visible, .btn:focus-visible {
    background: linear-gradient(135deg, #98613c, #a05625);
    transform: scale(1.05);
    outline: none;
  }
  
    
  
  /* Forms */
    input, select, textarea {
    font: inherit;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--color-primary-1);
    border-radius: var(--border-radius);
    width: 100%;
  }
  
  /* Labels */
  label {
    margin-bottom: 6px;
    font-weight: bold;
    display: block;
    text-align: left;
  }
  
  /* Responsive container */
  .container {
    background-color: #1e1e1e;
    padding: clamp(1.5rem, 5vw, 3rem);
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.9);
    
    width: 100%;
    max-width: 500px;
    margin: 0 1rem 20px;
    box-sizing: border-box;
    text-align: center;
  }
  
  .container h1 {
    text-align: center;
  }
  
  
  /* Footer text */
  .footer-text {
    text-align: center;
    font-size: 12px;
    margin-top: 30px;
    color: var(--font-color-footer);
    display: block;
    width: 100%;
    clear: both;
  }

  /* Error text */
  .error-text {
    list-style-type: disc;
    color: var(--color-secondary-4);
    font-size: 0.75rem;
    font-style: italic;
    text-align: left;
  }
  
  /* ==========================================================================
  Utility Classes
  ========================================================================== */
  
  /* Text alignment */
  .text-center {
    text-align: center;
  }
  
  /* Margin-top */
  .mt-1 { margin-top: 0.25rem; }  /* 4px */
  .mt-2 { margin-top: 0.5rem; }   /* 8px */
  .mt-3 { margin-top: 1rem; }     /* 16px */
  
  /* Centered elements */
  .centered-page {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }

  /* ==========================================================================
  App-Specific Classes
  ========================================================================== */

/* -------------------------------------------------------
   HOMESCREEN
-------------------------------------------------------- */

#home-screen {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: url("/images/bg/utg_homescreen_bg.png") no-repeat center/cover;
    overflow: visible;
  }
  
  /* Floating star animation layer */
  #stars-container {
    position: fixed;
    inset: 0;
    z-index: 5;
    pointer-events: none;
    animation: driftUpCurve 20s linear infinite;
  }
  
  @keyframes driftUpCurve {
    0% { transform: translate(0, 0); }
    25% { transform: translate(10px, -30px); }
    50% { transform: translate(20px, -60px); }
    75% { transform: translate(10px, -90px); }
    100% { transform: translate(0, -120px); }
  }
  
  /* All direct children except stars */
  #home-screen > *:not(#stars-container) {
    position: relative;
    z-index: 10;
  }
  
  /* -------------------------------------------------------
   HELPBOX MODAL
--------------------------------------------------------- */

/* Modal overlay with semi-transparent black background */
#helpbox-modal {
    position: fixed;
    inset: 0;
    z-index: 3000;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  /* Modal content box with black glow */
  .helpbox-content {
    background-color: var(--color-primary-1);
    color: #fff;
    border-radius: 12px;
    padding: 2rem;
    width: 90vw;
    max-width: 1080px;
    text-align: center;
    box-shadow: 0 0 30px rgba(0, 0, 0, 1); /* strong black glow */
    position: relative;
    z-index: 1;
  }
  
  /* Images inside helpbox with subtle black shadow */
  .helpbox-content img {
    max-width: 100%;
    height: auto;
    margin: 1rem 0;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
  }
  
  /* Close button styling with black shadow */
  #helpbox-close {
    position: absolute;
    top: 1.125rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 1);
    z-index: 101;
  }
  
  /* Helpbox open button */
  #helpbox-button {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background-color: var(--color-primary-1);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    font-size: 24px;
    cursor: pointer;
    text-align: justify;
    z-index: 20;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  

  /* -------------------------------------------------------
     ROTATING LOGO
  -------------------------------------------------------- */
  
  #rotating-wrapper {
    display: inline-block;
    transition: transform 0.15s ease 0.02s;
  }
  
  #rotating-wrapper:hover {
    transform: scale(1.175);
  }
  
  #rotating-logo {
    width: 500px;
    height: auto;
    object-fit: contain;
    display: block;
    cursor: pointer;
    animation: rotateInfinite 12s linear infinite;
    margin: 2rem 0;
    z-index: 2;
  }
  
  @keyframes rotateInfinite {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }
  
  /* -------------------------------------------------------
     GAME AREA
  -------------------------------------------------------- */
  
  #game-area {
    position: fixed;
    inset: 0;
    z-index: 1;
    display: none;
    background: url("/images/bg/utg_l1_background.png") no-repeat center/cover;
  }
  
  /* -------------------------------------------------------
     SCORE DISPLAY
  -------------------------------------------------------- */
  
  #score {
    position: fixed;
    top: 20px;
    right: 20px;
    min-width: 140px;
    padding: 12px 20px;
    border-radius: 16px;
    background: linear-gradient(135deg, #dd9e73, #98613c);
    box-shadow: 0 0 8px 3px rgba(60, 40, 20, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    font: bold 1.7rem var(--font-base);
    color: white;
    cursor: default;
    user-select: none;
    white-space: nowrap;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 1000;
  }
  
  #score:hover {
    transform: scale(1.05);
    box-shadow: 0 0 14px 6px rgba(60, 40, 20, 1);
  }
  
  @keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 6px 3px rgba(60, 40, 20, 0.7); }
    50% { box-shadow: 0 0 14px 6px rgba(60, 40, 20, 1); }
  }
  
  #score.pulse {
    animation: pulseGlow 0.6s ease-in-out;
  }
  
  /* -------------------------------------------------------
     LETTER TILES
  -------------------------------------------------------- */
  
  .letter {
    width: 120px;
    height: 120px;
    position: absolute;
    border-radius: 16px;
    box-shadow: 0 0 6px 3px rgba(60, 40, 20, 0.7);
    cursor: default;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
    z-index: 1;
  }
  
  .letter img {
    width: 90%;
    height: 90%;
    object-fit: contain;
    border-radius: 12px;
    pointer-events: none;
    user-select: none;
  }
  
  .letter:hover {
    transform: scale(1.25);
    box-shadow: 0 0 10px 4px rgba(60, 40, 20, 1);
    z-index: 10;
  }
  
  /* -------------------------------------------------------
     END SCREEN OVERLAY
  -------------------------------------------------------- */
  
  #end-screen-overlay {
    position: fixed;
    inset: 0;
    display: none;
    justify-content: center;
    align-items: center;
    background: url('/images/bg/utg_endscreen_bg.png') no-repeat center/cover;
    box-shadow: inset 0 0 50px 15px rgba(221, 158, 115, 0.5);
    animation: fadeInOverlay 0.5s ease forwards;
    z-index: 2000;
  }
  
  #end-screen-overlay.visible {
    display: flex;
  }
  
  .endscreen-popup {
    background: #dd9e73;
    color: #5c3d1a;
    font-family: var(--font-base);
    padding: 3rem 3.5rem;
    width: 90%;
    max-width: 420px;
    border-radius: 20px;
    border: 2px solid #d1874a;
    text-align: center;
    box-shadow:
      0 4px 15px rgba(221, 158, 115, 0.35),
      0 0 12px 3px rgba(221, 158, 115, 0.3);
    animation: popupJiggle 2.5s ease-in-out infinite;
    user-select: none;
  }
  
  .endscreen-popup h2 {
    font-size: 2.6rem;
    margin-bottom: 1.2rem;
    color: #000;
    text-shadow: 0 0 6px rgba(221, 158, 115, 0.8);
  }
  
  .endscreen-popup p {
    font-size: 1.4rem;
    margin-bottom: 2.2rem;
    font-weight: 600;
    color: #000;
    text-shadow: 0 0 4px rgba(221, 158, 115, 0.6);
  }
  
  .endscreen-popup strong#final-score {
    font-size: 2rem;
    color: #000;
    text-shadow: 0 0 5px rgba(221, 158, 115, 0.9);
  }
  
  /* Endscreen Button */
  #back-to-home-btn {
    background: linear-gradient(45deg, #dd9e73, #e7b37c);
    border: none;
    border-radius: 35px;
    padding: 1rem 2.8rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: #4a3211;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(221, 158, 115, 0.6);
    transition: transform 0.15s ease, box-shadow 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    user-select: none;
  }
  
  #back-to-home-btn:hover,
  #back-to-home-btn:focus {
    transform: scale(1.05);
    box-shadow: 0 0 16px rgba(221, 158, 115, 0.9);
    outline: none;
  }
  
  #back-to-home-btn:active {
    transform: scale(0.97);
    box-shadow: 0 0 8px rgba(180, 140, 70, 0.7);
  }
  
  @keyframes fadeInOverlay {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  
  @keyframes popupJiggle {
    0%, 100% { transform: translateX(0) rotate(0deg); }
    25% { transform: translateX(-1.5px) rotate(-0.7deg); }
    50% { transform: translateX(1.5px) rotate(0.7deg); }
    75% { transform: translateX(-1px) rotate(-0.5deg); }
  }
  
  /* -------------------------------------------------------
     BACK BUTTON
  -------------------------------------------------------- */
  
  #back-btn {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    background-color: var(--color-primary-1);
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    padding: 0.75rem 1.75rem;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
  }