/* --- FONT IMPORTS --- */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@500&display=swap');

/* --- THEME VARIABLES & GLOBAL STYLES --- */
:root {
    /* Color Palette (Default: Dark Mode) */
    --primary-color: #4a69bd;
    --primary-hover-color: #6082d4;
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #e0e0e0;
    --text-muted-color: #a0a0a0;
    --border-color: #3a3a3a;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --success-color: #2ecc71;
    --success-glow: rgba(46, 204, 113, 0.3);
    --surface-gradient: linear-gradient(145deg, #2a2a2a, #161616);

    /* Scrollbar */
    --sb-track-color: #1e1e1e;
    --sb-thumb-color: var(--primary-color);
    --sb-size: 10px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

body.light-mode {
    /* Light Mode Palette */
    --primary-color: #3c5cac;
    --primary-hover-color: #4a69bd;
    --background-color: #f4f7f9;
    --surface-color: #ffffff;
    --text-color: #2c3e50;
    --text-muted-color: #555;
    --border-color: #dfe4ea;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --success-color: #27ae60;
    --success-glow: rgba(39, 174, 96, 0.2);
    --surface-gradient: linear-gradient(145deg, #ffffff, #e6eef3);
    
    --sb-track-color: #e0e0e0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}

html, body {
    width: 100%;
    min-height: 100vh;
    box-sizing: border-box;
    overflow-x: hidden;
}

body {
    color: var(--text-color);
    background-color: var(--background-color);
    overflow-x: hidden;
    scrollbar-color: var(--sb-thumb-color) var(--sb-track-color);
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

body::-webkit-scrollbar { width: var(--sb-size); }
body::-webkit-scrollbar-track { background: var(--sb-track-color); }
body::-webkit-scrollbar-thumb { background: var(--sb-thumb-color); border-radius: 10px; }

/* --- THEME TOGGLE --- */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    cursor: pointer;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 8px var(--shadow-color);
    transition: all var(--transition-speed) ease;
}
.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-color);
}
.theme-icon {
    width: 24px;
    height: 24px;
    color: var(--text-color);
}
#theme-icon-moon { display: none; }
.light-mode #theme-icon-sun { display: none; }
.light-mode #theme-icon-moon { display: block; }


/* --- PRELOADER --- */
.preloader {
    background: #000 url(img/0001.gif) no-repeat center;
    height: 100vh;
    width: 100%;
    position: fixed;
    z-index: 300;
}

/* --- MAIN LAYOUT & CONTAINER --- */
.main {
    min-height: 100vh;
    transition: filter 0.5s ease, transform 0.5s ease;
    pointer-events: auto;
}
.main.active {
    filter: blur(10px);
    transform: scale(0.95);
    pointer-events: none;
}
.container {
    display: flex;
    height: 100vh;
    width: 100%;
}

/* --- HOME SCREEN --- */
.home {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--background-color);
}
.home-content {
    max-width: 600px;
    display: flex;
    align-items: center;
    flex-direction: column;
    padding: 20px;
    text-align: center;
}
.home-content h1 {
    font-size: 3em;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 15px;
}
.home-content p {
    font-size: 1.2em;
    color: var(--text-muted-color);
    margin-bottom: 30px;
}
.home-content .start-btn {
    padding: 15px 40px;
    background: var(--primary-color);
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    font-size: 1.5em;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}
.home-content .start-btn:hover {
    background: var(--primary-hover-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px var(--shadow-color);
}

/* --- POPUP & MODAL STYLES --- */
.popup-info, .result-box, .login-modal-content {
    background: var(--surface-color);
    color: var(--text-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 10px 30px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed) ease-in-out;
}
.popup-info {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 500px;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    z-index: 200;
}
.popup-info.active {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}
.popup-info h2, .result-box h2, .login-modal-content h2 {
    font-size: 2em;
    color: var(--primary-color);
}
.popup-info .info {
    display: block;
    font-size: 1.1em;
    color: var(--text-muted-color);
    margin: 10px 0;
}
.popup-info label {
    color: var(--text-color);
    font-weight: 600;
}
.popup-info .btn-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
    padding-top: 15px;
}
.popup-info .info-btn {
    padding: 10px 25px;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}
.popup-info .exit-btn {
    background: transparent;
    color: var(--primary-color);
}
.popup-info .exit-btn:hover {
    background: var(--primary-color);
    color: #fff;
}
.popup-info .continue-btn {
    background: var(--primary-color);
    color: #fff;
}
.popup-info .continue-btn:hover {
    background: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
}

/* --- QUIZ SECTION --- */
.quiz-section {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: scale(0);
    transition: transform 0.4s ease-in-out;
    z-index: 100;
}
.quiz-section.active { 
    transform: scale(1);
    /* BUG FIX: Add a solid background to hide content behind the quiz/result box */
    background: var(--background-color);
}

.quiz-box {
    position: relative;
    width: 100%;
    max-width: 100%;
    min-height: 100vh;
    background: var(--background-color);
    display: flex;
    flex-direction: column;
    padding: 20px 30px;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.9);
    transition: all 0.4s ease;
}
.quiz-section.active .quiz-box.active {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}
.quiz-box h1 {
    font-size: 1.5em;
    text-align: center;
    background: var(--primary-color);
    border-radius: 6px;
    color: #fff;
    padding: 12px;
    margin-bottom: 10px;
}
.quiz-box .quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}
.quiz-header span { font-size: 1.2em; font-weight: 500; }
.quiz-header .header-score {
    background: var(--primary-color);
    color: #fff;
    border-radius: 5px;
    padding: 7px 12px;
    font-weight: 600;
}
.quiz-box .question-text img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 8px;
}
.option-list .option {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    margin: 15px 0;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}
.option-list .option:hover {
    border-color: var(--primary-color);
    transform: translateX(5px);
}
.option-list .option img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}
.option-list .option.selected {
    border-color: var(--success-color);
    background-color: transparent;
    box-shadow: 0 0 15px var(--success-glow);
}
.light-mode .option-list .option.selected {
    background-color: #eafaf1;
}

/* --- QUIZ FOOTER --- */
.quiz-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    margin-top: 25px;
}
.quiz-footer .question-total {
    font-size: 1em;
    font-weight: 600;
    color: var(--text-muted-color);
}
.quiz-footer .next-btn {
    padding: 12px 30px;
    background: #555;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    pointer-events: none;
    transition: all var(--transition-speed) ease;
}
.quiz-footer .next-btn.active {
    pointer-events: auto;
    background: var(--primary-color);
}
.quiz-footer .next-btn.active:hover {
    background: var(--primary-hover-color);
    transform: scale(1.05);
}

/* --- RESULT BOX --- */
.result-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    pointer-events: none;
}
.result-box.active {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}
.result-box .percentage-container {
    width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 20px 0 40px;
}
.percentage-container .circular-progress {
    position: relative;
    width: 250px;
    height: 250px;
    background: conic-gradient(var(--primary-color) 3.6deg, var(--border-color) 0deg);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.percentage-container .circular-progress::before {
    content: '';
    position: absolute;
    width: 210px;
    height: 210px;
    background: var(--surface-color);
    border-radius: 50%;
}
.circular-progress .progress-value {
    position: relative;
    font-size: 3em;
    font-weight: 600;
    color: var(--text-color);
}
.percentage-container .score-text {
    font-size: 1.5em;
    font-weight: 600;
    margin-top: 20px;
    color: var(--text-color);
}
.result-box .buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    width: 100%;
}
.buttons button {
    width: 140px;
    height: 47px;
    background: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    font-size: 1em;
    color: #fff;
    font-weight: 600;
    margin: 0 10px 10px;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}
.buttons button:hover {
    transform: translateY(-2px);
}
.buttons .tryAgain-btn:hover {
    background: #fff;
    color: var(--primary-color);
}
.buttons .goHome-btn {
    background: transparent;
    color: var(--primary-color);
}
.buttons .goHome-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

/* --- LOGIN MODAL --- */
.login-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}
#usernameInput {
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
    color: var(--text-color);
    border-radius: 5px;
    outline: none;
}
#loginBtn {
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background var(--transition-speed);
}
#loginBtn:hover {
    background: var(--primary-hover-color);
}

/* --- RESPONSIVE DESIGN & OPTIMIZATIONS --- */
@media (max-width: 700px) {
    .home-content h1 { font-size: 2.2em; }
    .quiz-box h1, .result-box h2, .popup-info h2 { font-size: 1.5em !important; }
    .percentage-container .circular-progress { width: 200px; height: 200px; }
    .percentage-container .circular-progress::before { width: 170px; height: 170px; }
}
@media (max-width: 600px) {
    body {
        font-size: 15px;
    }
}
@media (min-width: 601px) and (max-width: 900px) {
    body {
        font-size: 17px;
    }
}
@media (min-width: 901px) {
    body {
        font-size: 18px;
    }
}
@media (max-width: 480px) {
    .home-content h1 { font-size: 1.8em; }
    .home-content p { font-size: 1em; }
    .home-content .start-btn { font-size: 1.2em; padding: 12px 30px; }
    .quiz-box, .popup-info, .result-box { padding: 15px; }
    .buttons button { 
        width: 100%; 
        margin: 5px 0; 
    }
    .theme-toggle { top: 10px; right: 10px; width: 40px; height: 40px; }
    .theme-icon { width: 20px; height: 20px; }
    .percentage-container .circular-progress { width: 180px; height: 180px; }
    .percentage-container .circular-progress::before { width: 150px; height: 150px; }
    .circular-progress .progress-value { font-size: 2.5em; }
    .percentage-container .score-text { font-size: 1em; }
}