:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(120deg, #84fab0 0%, #8fd3f4 100%);
    --accent-gradient: linear-gradient(to right, #fa709a 0%, #fee140 100%);
    --bg-gradient: linear-gradient(to top, #dfe9f3 0%, white 100%);
    
    --card-bg: rgba(255, 255, 255, 0.9);
    --card-shadow: 0 10px 20px rgba(0,0,0,0.15);
    --text-color: #2d3748;
    --highlight-color: #ffd700;
    
    --correct-bg: #48bb78;
    --wrong-bg: #f56565;
    
    --font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* Themes */
body.theme-dark {
    --primary-gradient: linear-gradient(to bottom, #2d3748, #1a202c);
    --secondary-gradient: linear-gradient(to bottom, #4a5568, #2d3748);
    --accent-gradient: linear-gradient(to right, #ed8936, #ecc94b);
    --bg-gradient: linear-gradient(to bottom, #1a202c, #000);
    
    --card-bg: #2d3748;
    --card-shadow: 0 4px 6px rgba(0,0,0,0.3);
    --text-color: #f7fafc;
    --highlight-color: #ed8936;
    
    --correct-bg: #48bb78;
    --wrong-bg: #f56565;
}

body.theme-pastel {
    --primary-gradient: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
    --secondary-gradient: linear-gradient(120deg, #fbc2eb 0%, #a6c1ee 100%);
    --accent-gradient: linear-gradient(to right, #ff9a9e 0%, #fecfef 99%, #fecfef 100%);
    --bg-gradient: linear-gradient(to top, #f3e7e9 0%, #e3eeff 99%, #e3eeff 100%);
    
    --card-bg: rgba(255, 255, 255, 0.8);
    --text-color: #555;
    --highlight-color: #ff9a9e;
}

body.theme-neon {
    --primary-gradient: linear-gradient(to right, #ff00cc, #333399);
    --secondary-gradient: linear-gradient(to right, #00dbde, #fc00ff);
    --accent-gradient: linear-gradient(to right, #00f260, #0575e6);
    --bg-gradient: linear-gradient(to bottom, #000000, #130f40);
    
    --card-bg: rgba(20, 20, 20, 0.9);
    --text-color: #fff;
    --highlight-color: #00ff00;
    --card-shadow: 0 0 15px rgba(0, 255, 0, 0.2);
}

/* High Contrast Theme */
body.theme-high-contrast {
    --primary-gradient: linear-gradient(to bottom, #000, #000);
    --secondary-gradient: linear-gradient(to bottom, #fff, #fff);
    --accent-gradient: linear-gradient(to bottom, #ff0, #ff0);
    --bg-gradient: linear-gradient(to bottom, #000, #000);
    
    --card-bg: #000;
    --card-shadow: none;
    --text-color: #fff;
    --highlight-color: #ff0;
    
    --correct-bg: #00ff00;
    --wrong-bg: #ff0000;
}

* {
    box-sizing: border-box;
    user-select: none;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background: var(--bg-gradient);
    color: var(--text-color);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#app {
    width: 100%;
    height: 100%;
    max-width: 1600px; /* Limit width on ultra-wide */
    display: flex;
    flex-direction: column;
    padding: 2vh 2vw;
    position: relative;
}

/* Header */
#game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5vh 3vw;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    margin-bottom: 2vh;
    backdrop-filter: blur(10px);
    flex-shrink: 0;
    height: 10vh;
}

body.theme-high-contrast #game-header {
    border: 2px solid #fff;
}

.hud-item {
    font-size: 2.5vh;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
}

.score-float {
    position: absolute;
    top: -30px;
    right: 0;
    color: var(--correct-bg);
    font-weight: bold;
    font-size: 1.5em;
    animation: floatUp 1s ease-out forwards;
}

@keyframes floatUp {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-30px); }
}

/* Screens */
.screen {
    flex: 1;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    animation: fadeIn 0.4s ease-out;
}

.screen.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1); }
}

.hidden { display: none !important; }

/* Typography */
h1.title {
    font-size: 8vh;
    background: var(--primary-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 5vh;
    text-transform: uppercase;
    letter-spacing: 2px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

body.theme-high-contrast h1.title {
    background: none;
    -webkit-text-fill-color: #fff;
    color: #fff;
}

h2 {
    font-size: 4vh;
    margin-bottom: 3vh;
    color: var(--text-color);
}

/* Buttons & Scannables */
button, .scannable {
    border: none;
    outline: none;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

/* Menu Buttons */
.menu-options {
    display: flex;
    flex-direction: column;
    gap: 3vh;
    width: 40vw;
    max-width: 500px;
}

.menu-btn {
    padding: 3vh;
    font-size: 3vh;
    border-radius: 15px;
    background: var(--card-bg);
    box-shadow: var(--card-shadow);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

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

/* Category Grid */
#category-selection, #game-selection {
    justify-content: flex-start;
    padding-top: 1vh;
}

.grid-header {
    width: 100%;
    padding: 1vh 2vw;
    display: flex;
    justify-content: flex-start;
    gap: 1vw;
}

.grid-header-btn {
    background: #444;
    color: white;
    border: none;
    padding: 1.2vh 2vw;
    border-radius: 8px;
    font-size: 2vh;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
}

.grid-header-btn:hover {
    background: #555;
}

.grid-header-btn.load-file {
    background: #666;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 1.5vh 1.5vw;
    width: 100%;
    height: 65vh; /* Reduced for better square fit */
    flex-grow: 1;
}

.category-card {
    background: var(--primary-gradient);
    color: white;
    border-radius: 20px;
    font-size: 3vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--card-shadow);
    text-align: center;
    padding: 20px;
    width: 100%;
    height: 100%;
    margin: 0;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.category-card.has-image {
    background: #000;
    justify-content: flex-end;
    padding-bottom: 1.5rem;
}

.category-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.5;
    z-index: 0;
    transition: transform 0.5s, opacity 0.3s;
}

.category-card:hover .category-img,
.category-card.selected .category-img {
    transform: scale(1.1);
    opacity: 0.3;
}

.category-card span,
.category-card i {
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.9);
}

.category-card i {
    margin-bottom: 10px;
}

body.theme-high-contrast .category-card {
    background: #000;
    border: 2px solid #fff;
}

/* Game Screen Layout */
#game-screen {
    justify-content: space-between;
    padding-bottom: 2vh;
}

#question-container {
    background: var(--card-bg);
    border-radius: 25px;
    padding: 4vh 4vw;
    width: 100%;
    height: 35vh; /* Fixed height for question */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--card-shadow);
    margin-bottom: 2vh;
    text-align: center;
    order: -1;
    overflow: hidden;
}

body.theme-high-contrast #question-container {
    background: #000;
    border: 2px solid #fff;
}

#media-container {
    margin-bottom: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    max-height: 20vh;
    width: 100%;
}

#media-container:empty {
    display: none;
}

.question-media {
    max-width: 100%;
    max-height: 20vh;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

#question-text {
    font-size: 4vh;
    line-height: 1.3;
    margin: 0;
}

#question-text-wrapper {
    padding: 1vh 2vw;
    border-radius: 15px;
    transition: all 0.2s ease;
}

#media-container.scannable {
    border-radius: 15px;
    padding: 5px; /* Space for ring */
    transition: all 0.2s ease;
    cursor: pointer;
}

#answers-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 2vh 2vw;
    width: 100%;
    height: 45vh; /* Fixed height for answers */
}

.answer-btn {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 2vh 3vw;
    font-size: 3vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: var(--card-shadow);
    color: var(--text-color);
    width: 100%;
    height: 100%;
    margin: 0;
}

body.theme-high-contrast .answer-btn {
    background: #000;
    border: 2px solid #fff;
    color: #fff;
}

/* Answer States */
.answer-btn.correct {
    background: var(--correct-bg) !important;
    color: white !important;
    transform: scale(1.02);
}

.answer-btn.wrong {
    background: var(--wrong-bg) !important;
    color: white !important;
    opacity: 0.8;
}

/* Scanning Highlight */
.scannable.scanned {
    outline: none;
    box-shadow: 0 0 0 6px var(--highlight-color), var(--card-shadow);
    transform: scale(1.02);
    z-index: 10;
}

body.theme-high-contrast .scannable.scanned {
    box-shadow: 0 0 0 6px #ff0;
    border-color: #ff0;
}

/* Settings Grid */
.grid-container-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2vh 2vw;
    width: 80vw;
    max-width: 1000px;
    margin-bottom: 3vh;
}

.setting-item {
    background: var(--card-bg);
    padding: 3vh;
    border-radius: 15px;
    font-size: 2.5vh;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--card-shadow);
    height: 100%;
}

body.theme-high-contrast .setting-item {
    border: 1px solid #fff;
}

/* Pause Overlay */
#pause-overlay, #editor-warning-overlay, #load-game-warning-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.pause-content {
    background: var(--card-bg);
    padding: 5vh 5vw;
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    gap: 3vh;
    min-width: 400px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.pause-content button {
    padding: 2vh;
    font-size: 2.5vh;
    border-radius: 10px;
    background: #f0f2f5;
}

body.theme-high-contrast .pause-content {
    background: #000;
    border: 2px solid #fff;
}

/* Back Buttons */
.back-btn {
    margin-top: auto;
    background: #e2e8f0;
    color: #4a5568;
    padding: 1.5vh 4vw;
    border-radius: 50px;
    font-size: 2vh;
}

/* Particles */
#particles {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
}

.confetti {
    position: absolute;
    width: 12px; height: 12px;
    background-color: #f00;
    animation: fall linear forwards;
}

@keyframes fall {
    to { transform: translateY(100vh) rotate(720deg); }
}

/* Utility */
#pause-btn {
    background: transparent;
    font-size: 4vh;
    padding: 5px;
    box-shadow: none;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.8)) drop-shadow(0 0 4px rgba(0, 0, 0, 0.5));
}

#pause-btn:hover {
    filter: drop-shadow(0 0 3px rgba(0, 0, 0, 1)) drop-shadow(0 0 6px rgba(0, 0, 0, 0.7));
}

body.theme-high-contrast #pause-btn {
    filter: drop-shadow(0 0 2px #ff0) drop-shadow(0 0 4px #ff0);
}

/* Answer Images */
.answer-btn.has-image {
    flex-direction: column;
    padding: 1vh;
    gap: 1vh;
}

.answer-img {
    max-width: 100%;
    max-height: 15vh; /* Limit height to fit in grid */
    object-fit: contain;
    border-radius: 10px;
    pointer-events: none;
}

.answer-btn.has-image .answer-text {
    font-size: 2.5vh;
}

/* Image Popup Overlay - Center Pop-out */
#image-popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6); /* Darker dimming for focus */
    display: flex;
    justify-content: center; /* Center horizontally */
    align-items: center; /* Center vertically */
    z-index: 2000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#image-popup-overlay:not(.hidden) {
    opacity: 1;
}

#popup-image {
    /* Force larger size while maintaining aspect ratio */
    min-width: 60vw;
    min-height: 60vh;
    max-width: 95vw;
    max-height: 95vh;
    object-fit: contain;
    
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    border: 8px solid white;
    transform: scale(0.8);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

#popup-video-container {
    /* Force larger size while maintaining aspect ratio */
    min-width: 60vw;
    min-height: 60vh;
    max-width: 95vw;
    max-height: 95vh;
    width: 90vw; 
    height: 85vh;
    
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    border: 8px solid white;
    background: #000;
    overflow: hidden;
    
    transform: scale(0.8);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Flex to center and fill */
    display: flex;
    justify-content: center;
    align-items: center;
}

#popup-video-container iframe,
#popup-video-container video,
#popup-video-container img {
    width: 100% !important;
    height: 100% !important;
    max-width: 100% !important;
    max-height: 100% !important;
    object-fit: contain;
    border: none !important;
}

#image-popup-overlay:not(.hidden) #popup-image,
#image-popup-overlay:not(.hidden) #popup-video-container {
    transform: scale(1);
}