/* Main Styling for Math Friends */

:root {
    --primary-color: #8A4FFF;      /* Tím nhạt */
    --secondary-color: #FF6B6B;    /* Hồng đào */
    --accent-color: #4ECDC4;       /* Xanh ngọc */
    --background-color: #F7F9FC;   /* Trắng xám nhẹ */
    --success-color: #76E383;      /* Xanh lá cây */
    --warning-color: #FFD166;      /* Vàng */
    --danger-color: #FF4F5E;       /* Đỏ */
    --text-color: #333333;         /* Đen xám */
    --light-color: #FFFFFF;        /* Trắng */
}

body {
    font-family: 'Rounded Mplus 1c', 'Quicksand', 'Comic Sans MS', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Navbar */
.navbar {
    background-color: var(--light-color);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 0 0 15px 15px;
}

.navbar-brand {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-link {
    font-size: 1.1rem;
    color: var(--text-color);
    margin: 0 0.5rem;
    transition: all 0.3s ease;
    border-radius: 20px;
    padding: 0.5rem 1rem !important;
}

.nav-link:hover {
    background-color: var(--primary-color);
    color: var(--light-color);
    transform: scale(1.05);
}

.dropdown-menu {
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border: none;
    padding: 0.5rem;
}

.dropdown-item {
    border-radius: 10px;
    padding: 0.5rem 1rem;
    transition: all 0.2s ease;
}

.dropdown-item:hover {
    background-color: var(--primary-color);
    color: var(--light-color);
    transform: translateX(5px);
}

/* Avatar */
.avatar-img {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 0.5rem;
    border: 2px solid var(--primary-color);
}

/* Main Container */
.main-container {
    min-height: calc(100vh - 180px);
    background-color: var(--light-color);
    border-radius: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Cards */
.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: var(--primary-color);
    color: var(--light-color);
    font-weight: bold;
    border-radius: 15px 15px 0 0 !important;
    padding: 1rem;
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: 30px;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #7A3FDF;
    border-color: #7A3FDF;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(138, 79, 255, 0.4);
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: #E65B5B;
    border-color: #E65B5B;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-success:hover {
    background-color: #66D373;
    border-color: #66D373;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(118, 227, 131, 0.4);
}

.btn-lg {
    font-size: 1.25rem;
    padding: 0.75rem 2rem;
}

/* Forms */
.form-control {
    border-radius: 10px;
    padding: 0.75rem 1rem;
    border: 2px solid #E1E5EA;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    box-shadow: 0 0 0 0.25rem rgba(138, 79, 255, 0.25);
    border-color: var(--primary-color);
}

.form-label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

/* Badges */
.badge {
    border-radius: 20px;
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-size: 0.85rem;
}

.badge-primary {
    background-color: var(--primary-color);
    color: var(--light-color);
}

.badge-secondary {
    background-color: var(--secondary-color);
    color: var(--light-color);
}

/* Alerts */
.alert {
    border-radius: 15px;
    border: none;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.alert-success {
    background-color: rgba(118, 227, 131, 0.2);
    color: #2D7834;
}

.alert-danger {
    background-color: rgba(255, 79, 94, 0.2);
    color: #C42833;
}

.alert-warning {
    background-color: rgba(255, 209, 102, 0.2);
    color: #B38728;
}

.alert-info {
    background-color: rgba(78, 205, 196, 0.2);
    color: #2B8C85;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 2rem 0;
    border-radius: 15px 15px 0 0;
    margin-top: 2rem;
}

.footer a {
    color: var(--light-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer a:hover {
    color: var(--warning-color);
    text-decoration: underline;
}

.social-icons a {
    font-size: 1.8rem;
    margin: 0 0.5rem;
}

/* Special Sections */
.hero-section {
    position: relative;
    padding: 4rem 0;
    text-align: center;
    overflow: hidden;
}

.hero-image {
    max-width: 100%;
    height: auto;
    margin-bottom: 2rem;
    animation: float 3s ease-in-out infinite;
}

.hero-text {
    max-width: 800px;
    margin: 0 auto;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.hero-text p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.hero-buttons {
    margin-top: 2rem;
}

.hero-buttons .btn {
    margin: 0 0.5rem;
    min-width: 180px;
}

/* Animated elements */
.floating {
    animation: float 3s ease-in-out infinite;
}

.bouncing {
    animation: bounce 1s ease infinite;
}

.pulsing {
    animation: pulse 2s ease infinite;
}

/* Animations */
@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0px);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-15px);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

/* Character animations */
.character {
    transition: all 0.3s ease;
}

.character:hover {
    transform: scale(1.1) rotate(5deg);
}

/* Test related styling */
.question-card {
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    background-color: #fff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.question-number {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.question-text {
    font-size: 1.35rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.option-btn {
    display: block;
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    text-align: left;
    background-color: #F0F2F5;
    border: 2px solid #E1E5EA;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.option-btn:hover {
    background-color: #E1E5EA;
    transform: translateX(5px);
}

.option-btn.selected {
    background-color: var(--primary-color);
    color: var(--light-color);
    border-color: var(--primary-color);
}

.option-btn.correct {
    background-color: var(--success-color);
    color: var(--light-color);
    border-color: var(--success-color);
}

.option-btn.incorrect {
    background-color: var(--danger-color);
    color: var(--light-color);
    border-color: var(--danger-color);
}

.test-timer {
    background-color: var(--warning-color);
    color: var(--text-color);
    font-size: 1.25rem;
    font-weight: bold;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.progress-tracker {
    margin-bottom: 2rem;
}

.progress-item {
    width: 40px;
    height: 40px;
    margin: 0 5px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    background-color: #F0F2F5;
    border-radius: 50%;
    font-weight: bold;
    transition: all 0.3s ease;
}

.progress-item.current {
    background-color: var(--warning-color);
    color: var(--text-color);
    transform: scale(1.2);
}

.progress-item.completed {
    background-color: var(--success-color);
    color: var(--light-color);
}

/* Dashboard elements */
.stat-card {
    background-color: var(--light-color);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    text-align: center;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.stat-label {
    font-size: 1rem;
    color: #6c757d;
}

.badge-card {
    text-align: center;
    margin-bottom: 2rem;
}

.badge-img {
    width: 120px;
    height: 120px;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.badge-img:hover {
    transform: scale(1.1) rotate(5deg);
}

.badge-name {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.badge-desc {
    font-size: 0.9rem;
    color: #6c757d;
}

/* Leaderboard */
.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    margin-bottom: 0.5rem;
    background-color: #fff;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.leaderboard-item:hover {
    transform: scale(1.02);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.leaderboard-rank {
    font-size: 1.5rem;
    font-weight: bold;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: var(--light-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
}

.leaderboard-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 1rem;
    object-fit: cover;
    border: 2px solid var(--primary-color);
}

.leaderboard-info {
    flex-grow: 1;
}

.leaderboard-name {
    font-weight: bold;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.leaderboard-grade {
    font-size: 0.9rem;
    color: #6c757d;
}

.leaderboard-score {
    font-weight: bold;
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-left: 1rem;
}

/* Animations for test results */
.result-animation {
    text-align: center;
    margin: 2rem 0;
}

.result-score {
    font-size: 5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
    animation: pulse 2s ease infinite;
}

.result-message {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.confetti-container {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    pointer-events: none;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .hero-text p {
        font-size: 1.1rem;
    }
    
    .hero-buttons .btn {
        margin-bottom: 1rem;
    }
    
    .stat-card {
        margin-bottom: 1rem;
    }
    
    .option-btn {
        padding: 0.75rem;
    }
    
    .question-text {
        font-size: 1.2rem;
    }
}

@media (max-width: 576px) {
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .main-container {
        padding: 1.5rem;
    }
    
    .navbar-brand img {
        height: 50px;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .test-timer {
        font-size: 1rem;
    }
    
    .progress-item {
        width: 30px;
        height: 30px;
        margin: 0 3px;
    }
    
    .stat-icon {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}