/* 2. THE CSS (Based on the new UI Kit) */
:root {
    /* Main colors */
    --card-bg: #e3f6ff;
    --card-border: #1a6e9a;
    --card-shadow: rgba(0, 0, 0, 0.15);
    
    --text-dark: #0f3a54;
    --text-light: #ffffff;
    
    /* Button Colors */
    --btn-blue: #00a8ff;
    --btn-blue-dark: #007bbd;
    --btn-green: #38c172;
    --btn-green-dark: #2a9156;
    --btn-orange: #f0ad4e;
    --btn-orange-dark: #ec971f;
    --btn-red: #d9534f;
    --btn-red-dark: #c9302c;
    --btn-purple: #9266cc;
    --btn-purple-dark: #7a54b3;
    --btn-grey: #a0a0a0;
    --btn-grey-dark: #7b7b7b;

    --progress-bar-bg: #d0c8e0;
    --progress-bar-fill: #9266cc;
    --progress-bar-shadow: #7a54b3;
}

/* --- Sliding Diagonals Background --- */
@keyframes slide {
    0% {
        transform: translateX(-25%);
    }
    100% {
        transform: translateX(25%);
    }
}

html {
    height: 100%;
}

body {
    font-family: 'Poppins', sans-serif;
    color: var(--text-dark);
    margin: 0;
    display: flex;
    flex-direction: column; /* Allow content and footer */
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden; 
    position: relative; 
    background-color: #1e5c8a; /* Static background for quiz/results */
    transition: background-color 0.5s ease; /* Smooth transition */
}

/* Apply diagonal background only when .diagonal-bg is present on body */
body.diagonal-bg .bg {
    animation: slide 3s ease-in-out infinite alternate;
    background-image: linear-gradient(-60deg, #30c8c4 50%, #1e5c8a 50%);
    bottom: 0;
    left: -50%;
    opacity: .5;
    position: fixed;
    right: -50%;
    top: 0;
    z-index: -1;
}

body.diagonal-bg .bg2 {
    animation-direction: alternate-reverse;
    animation-duration: 4s;
}

body.diagonal-bg .bg3 {
    animation-duration: 5s;
}
/* --- End of Background CSS --- */


/* --- Fixed Header Ribbon (FOR QUIZ SCREEN) --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 10px 30px;
    box-sizing: border-box;
    z-index: 1000;
    display: flex;
    justify-content: center;
}
.header-content {
    display: flex;
    justify-content: space-between; /* Pushes items to extremes */
    align-items: center;
    width: 100%;
    max-width: none; /* Removed max-width */
}
#logo-container { display: flex; align-items: center; }
/* Make sure SVG scales */
#logo-container svg { 
    height: 32px; 
    width: auto;
}

#header-nav {
    display: flex;
    gap: 10px;
}
#header-nav a {
    font-size: 16px; 
    font-weight: 700; 
    color: var(--text-light);
    text-decoration: none;
    transition: all 0.1s ease;
    padding: 10px 20px; 
    border-radius: 12px;
    text-shadow: 1px 1px 1px rgba(0,0,0,0.2);
    line-height: 1.3;
    box-shadow: 0 6px 0px var(--shadow-color, rgba(0,0,0,0.25)), 
                0 8px 15px rgba(0,0,0,0.15); 
    border: none; 
}
#header-nav a:hover {
    transform: translateY(2px);
    box-shadow: 0 4px 0px var(--shadow-color, rgba(0,0,0,0.25)),
                0 6px 10px rgba(0,0,0,0.15);
}
#header-nav a:active {
    transform: translateY(4px);
    box-shadow: 0 2px 0px var(--shadow-color, rgba(0,0,0,0.25)),
                0 4px 5px rgba(0,0,0,0.15);
}

/* Header button colors and shadows */
#btn-retake { 
    background-color: var(--btn-green); 
    --shadow-color: var(--btn-green-dark); 
}
#btn-help { 
    background-color: var(--btn-orange); 
    --shadow-color: var(--btn-orange-dark); 
}
#btn-exit { 
    background-color: var(--btn-red); 
    --shadow-color: var(--btn-red-dark); 
}


/* --- Main App Container --- */
#app-container {
    width: 100%;
    max-width: 600px; 
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 10;
    padding-top: 20px; 
    padding-bottom: 20px; 
}

/* Base container style */
.container {
    background-color: var(--card-bg);
    padding: 30px 40px;
    border-radius: 20px; 
    box-shadow: 0 10px 30px var(--card-shadow), inset 0 2px 3px rgba(255,255,255,0.7);
    border: 3px solid var(--card-border); 
    width: 100%;
    min-height: 400px;
    box-sizing: border-box;
    text-align: center;
}

/* --- Welcome Screen Styling (Matching Image 1) --- */
#welcome-container {
    padding: 50px 40px; 
}

/* Styling for the logo on the welcome screen */
#welcome-logo {
    height: 60px; /* Larger logo */
    width: auto;
    margin-bottom: 20px; /* Space below logo */
}

#subtitle {
    font-size: 22px; 
    font-weight: 600; 
    color: var(--text-dark);
    opacity: 0.95;
    margin-top: 0;
    margin-bottom: 30px; 
    text-shadow: 1px 1px 2px rgba(255,255,255,0.5); 
}

#welcome-container p.description {
    font-size: 18px; 
    color: var(--text-dark);
    margin-bottom: 40px; 
    line-height: 1.6;
    text-align: center; 
    max-width: 450px; 
    margin-left: auto;
    margin-right: auto;
}

.game-btn {
    padding: 16px 35px; 
    font-size: 20px; 
    font-weight: 800; 
    border-radius: 20px; 
    box-shadow: 0 8px 0px var(--shadow-color, rgba(0,0,0,0.3)), 
                0 10px 20px rgba(0,0,0,0.2); 
    font-family: 'Poppins', sans-serif;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    transition: all 0.1s ease-out;
    display: inline-flex; 
    align-items: center;
    justify-content: center;
    min-width: 150px;
    line-height: 1.3;
}
.game-btn:hover {
    transform: translateY(3px);
    box-shadow: 0 5px 0px var(--shadow-color, rgba(0,0,0,0.3)),
                0 7px 15px rgba(0,0,0,0.2);
}
.game-btn:active {
    transform: translateY(6px);
    box-shadow: 0 2px 0px var(--shadow-color, rgba(0,0,0,0.3)),
                0 4px 10px rgba(0,0,0,0.2);
}

#difficulty-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr; /* Back to 2 columns */
    gap: 25px; 
    margin-top: 20px; 
}

.difficulty-btn {
    width: 100%;
    min-width: 0; 
    padding: 18px 25px; 
    font-size: 20px;
    font-weight: 800;
}
#btn-easy { 
    background-color: var(--btn-green); 
    --shadow-color: var(--btn-green-dark);
}
#btn-hard { 
    background-color: var(--btn-purple); 
    --shadow-color: var(--btn-purple-dark);
}


/* --- Progress Bar --- */
#progress-bar-container {
    width: 100%;
    background-color: var(--progress-bar-bg);
    border-radius: 12px; 
    height: 20px; 
    margin-bottom: 25px;
    overflow: hidden; 
    border: 2px solid rgba(0,0,0,0.1); 
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
}
#progress-bar {
    width: 0%;
    height: 100%;
    background-color: var(--progress-bar-fill);
    background-image: linear-gradient(to bottom, var(--progress-bar-fill), var(--progress-bar-shadow));
    border-radius: 10px; 
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1); 
    position: relative;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2) inset;
}
#progress-bar::after { /* Glossy shine */
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to bottom, rgba(255,255,255,0.4), rgba(255,255,255,0.1));
    border-radius: 10px 10px 0 0;
}

/* --- Quiz Screen --- */
#quiz-stats {
    display: flex;
    justify-content: space-between;
    align-items: center; 
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
}

/* Countdown Timer */
#timer {
    font-size: 20px;
    font-weight: 800;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    background-color: var(--btn-green);
    border: 3px solid var(--btn-green-dark);
    box-shadow: 0 4px 0 var(--btn-green-dark), 0 6px 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}
#timer.warn { 
    background-color: var(--btn-orange);
    border-color: var(--btn-orange-dark);
    box-shadow: 0 4px 0 var(--btn-orange-dark);
}
#timer.danger { 
    background-color: var(--btn-red);
    border-color: var(--btn-red-dark);
    box-shadow: 0 4px 0 var(--btn-red-dark);
    animation: pulse 0.5s infinite alternate;
}
@keyframes pulse {
    to { transform: scale(1.1); }
}

@keyframes jiggle {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.2) rotate(-3deg); }
    75% { transform: scale(1.2) rotate(3deg); }
}
.score-update {
    animation: jiggle 0.4s ease-out;
    color: var(--btn-green-dark);
}

/* Quiz Hierarchy */
#prompt {
    font-size: 20px; 
    font-weight: 500;
    color: var(--text-dark);
    opacity: 0.8;
    margin-bottom: 10px;
}
#question {
    font-size: 40px; 
    font-weight: 800; 
    color: var(--text-dark);
    margin-bottom: 20px; 
    min-height: 60px; 
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column; /* To stack question and category */
    line-height: 1.2;
}

#answer {
    font-size: 30px;
    font-weight: 700;
    line-height: 1.4;
    position: relative;
    margin-top: 20px; 
    min-height: 45px;
}

.correct, .incorrect {
    font-weight: 800; 
    text-transform: uppercase; 
}
.correct { color: var(--btn-green-dark); }
.correct::before { 
    content: '✓';
    font-size: 32px;
    margin-right: 10px;
    font-weight: 800;
    vertical-align: middle;
}
.incorrect { color: var(--btn-red-dark); }
.incorrect::before { 
    content: '✗';
    font-size: 32px;
    margin-right: 10px;
    font-weight: 800;
    vertical-align: middle;
}
.info { color: var(--btn-blue-dark); } 

/* CTA Buttons (Reveal & OK) */
.cta-container {
    text-align: center;
    margin-top: 20px;
    min-height: 75px; 
}
.cta-btn {
    min-width: 120px;
}
#reveal-btn { 
    background-color: var(--btn-orange); 
    --shadow-color: var(--btn-orange-dark);
}
#ok-btn { 
    background-color: var(--btn-blue); 
    --shadow-color: var(--btn-blue-dark);
}

/* --- Results Screen --- */
#results-container h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--text-dark);
}
#final-score {
    font-size: 22px;
    color: var(--text-dark);
    margin-bottom: 30px;
}

/* Container for results buttons */
#results-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
    margin-top: 20px;
}

#play-again-btn {
    padding: 15px 30px;
    font-size: 20px;
    background-color: var(--btn-green); 
    --shadow-color: var(--btn-green-dark);
}

/* NEW: Upsell button styling */
#try-hard-btn {
    padding: 15px 30px;
    font-size: 20px;
    background-color: var(--btn-purple); 
    --shadow-color: var(--btn-purple-dark);
    font-size: 18px; /* Slightly smaller text */
}

#badge-display {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    animation: fadeInScale 0.5s ease-out;
    color: var(--text-dark);
}
#badge-display .badge-icon {
    display: block;
    font-size: 60px; 
    line-height: 1;
    margin-bottom: 10px;
}
@keyframes fadeInScale {
    0% { opacity: 0; transform: scale(0.5); }
    100% { opacity: 1; transform: scale(1); }
}
.badge-gold { color: #FFD700; }
.badge-silver { color: #a6a6a6; }
.badge-bronze { color: #CD7F32; }

/* --- Footer --- */
footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 15px;
    text-align: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    z-index: 5; 
}
footer a {
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}
footer a:hover {
    color: #d0c8e0;
}

/* Utility class */
.hidden {
    display: none;
}