/* Kids Theme CSS - Giao diện thân thiện cho trẻ em tiểu học */

:root {
    --primary-color: #FF6B8B; /* Hồng đậm */
    --secondary-color: #4BD6B7; /* Xanh ngọc */
    --accent-color: #FFCA3A; /* Vàng */
    --background-color: #F4F9FF; /* Trắng xanh nhạt */
    --text-dark: #3D4852; /* Đen xám */
    --text-light: #FFFFFF; /* Trắng */
    --danger-color: #FF4F5E; /* Đỏ */
    --success-color: #76E383; /* Xanh lá */
    --info-color: #73B5F0; /* Xanh dương */
    --warning-color: #FFD166; /* Vàng cam */
    --border-radius: 20px;
    --box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

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

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

h1 {
    font-size: 2.5rem;
}

.text-primary {
    color: var(--primary-color) !important;
}

.text-secondary {
    color: var(--secondary-color) !important;
}

.text-accent {
    color: var(--accent-color) !important;
}

/* Navbar */
.navbar {
    background-color: white !important;
    box-shadow: var(--box-shadow);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    padding: 10px 20px;
}

.navbar-brand {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color) !important;
    padding: 5px 0; /* ví dụ */
    display: flex;
    align-items: center;
}

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

.nav-link {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark) !important;
    margin: 0 5px;
    padding: 8px 16px !important;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.nav-link:hover, .nav-link:focus {
    background-color: var(--primary-color);
    color: white !important;
    transform: scale(1.05);
}

.nav-link i {
    margin-right: 5px;
}

/* Buttons */
.btn {
    border-radius: 50px;
    font-weight: 600;
    padding: 10px 25px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    box-shadow: var(--box-shadow);
    border: none;
}

.btn-primary {
    background-color: var(--primary-color) !important;
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(255, 107, 139, 0.3);
}

.btn-secondary {
    background-color: var(--secondary-color) !important;
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(75, 214, 183, 0.3);
}

.btn-accent {
    background-color: var(--accent-color) !important;
    color: var(--text-dark);
}

.btn-accent:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(255, 202, 58, 0.3);
}

.btn-lg {
    font-size: 1.2rem;
    padding: 12px 30px;
}

.btn i {
    margin-right: 8px;
}

/* Cards */
.card {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.card-header {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
    padding: 15px 20px;
    border-bottom: none;
}

.card-body {
    padding: 25px;
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 80px 0;
    overflow: hidden;
    background: linear-gradient(135deg, #f6f8ff 0%, #f0f5ff 100%);
    border-radius: var(--border-radius);
    margin-bottom: 50px;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-title .text-primary {
    display: inline-block;
    position: relative;
}

.hero-title .text-primary::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background-color: var(--accent-color);
    border-radius: 5px;
    opacity: 0.5;
    z-index: -1;
}

.hero-title .text-secondary {
    display: inline-block;
    position: relative;
}

.hero-title .text-secondary::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background-color: var(--primary-color);
    border-radius: 5px;
    opacity: 0.5;
    z-index: -1;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    margin-top: 30px;
}

.hero-buttons .btn {
    margin-right: 15px;
    margin-bottom: 15px;
}

.hero-image {
    max-width: 100%;
    animation: float 6s ease-in-out infinite;
}

/* Stats Section */
.stats-container {
    margin: 50px 0;
}

.stat-item {
    text-align: center;
    padding: 20px;
    border-radius: var(--border-radius);
    background-color: white;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-10px);
}

.stat-value {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 10px;
    background: linear-gradient(45deg, var(--primary-color), var(--info-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--text-dark);
}

/* Test Card */
.test-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: white;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
    height: 100%;
}

.test-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.test-card-header {
    padding: 20px;
    background-color: var(--primary-color);
    color: white;
}

.test-card-body {
    padding: 25px;
}

.test-card-title {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.test-level {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: bold;
    margin-right: 10px;
    margin-bottom: 10px;
}

.test-level.level-1 {
    background-color: #E3F2FD;
    color: #1976D2;
}

.test-level.level-2 {
    background-color: #E8F5E9;
    color: #388E3C;
}

.test-level.level-3 {
    background-color: #FFF3E0;
    color: #E64A19;
}

.test-level.level-4 {
    background-color: #FCE4EC;
    color: #C2185B;
}

.test-level.level-5 {
    background-color: #F3E5F5;
    color: #7B1FA2;
}

/* Quiz Question */
.question-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
}

.question-number {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.question-text {
    font-size: 1.5rem;
    margin-bottom: 25px;
    line-height: 1.4;
}

.option-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 15px 20px;
    margin-bottom: 15px;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 500;
    background-color: #F8F9FA;
    border: 2px solid #E9ECEF;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.option-btn:hover {
    transform: translateX(10px);
    background-color: #F0F2F5;
}

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

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

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

.option-letter {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    margin-right: 10px;
}

.selected .option-letter,
.correct .option-letter,
.incorrect .option-letter {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Test Timer */
.test-timer-container {
    position: relative;
    margin-bottom: 30px;
    text-align: center;
}

.test-timer {
    display: inline-block;
    padding: 10px 30px;
    background-color: var(--accent-color);
    color: var(--text-dark);
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 50px;
    box-shadow: var(--box-shadow);
}

.timer-danger {
    background-color: var(--danger-color) !important;
    color: white !important;
    animation: pulse 1s infinite;
}

.timer-warning {
    background-color: var(--warning-color) !important;
}

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

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

/* Animations */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

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

@keyframes wiggle {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(5deg); }
    75% { transform: rotate(-5deg); }
}

.floating {
    animation: float 6s ease-in-out infinite;
}

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

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

.wiggling {
    animation: wiggle 1s ease-in-out infinite;
}

/* Decorative Elements */
.shape-decoration {
    position: absolute;
    z-index: -1;
    opacity: 0.5;
}

.shape-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
}

.shape-square {
    width: 80px;
    height: 80px;
    border-radius: 15px;
    transform: rotate(45deg);
}

.shape-triangle {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid;
}

.circle-1 {
    top: 10%;
    left: 5%;
    background-color: var(--primary-color);
    opacity: 0.1;
}

.circle-2 {
    bottom: 10%;
    right: 5%;
    background-color: var(--secondary-color);
    opacity: 0.1;
}

.square-1 {
    top: 20%;
    right: 10%;
    background-color: var(--accent-color);
    opacity: 0.1;
}

.triangle-1 {
    bottom: 20%;
    left: 10%;
    border-bottom-color: var(--info-color);
    opacity: 0.1;
}

/* Media Queries */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-section {
        padding: 50px 0;
    }
    
    .hero-image {
        margin-top: 30px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 10px;
    }
    
    .stat-value {
        font-size: 2.5rem;
    }
}

@media (max-width: 576px) {
    .btn {
        padding: 8px 20px;
    }
    
    .question-text {
        font-size: 1.3rem;
    }
    
    .option-btn {
        padding: 12px 15px;
        font-size: 1rem;
    }
}

.navbar-brand img {
    height: 70px;   /* chỉnh chiều cao logo bạn muốn */
    width: auto;    /* giữ tỉ lệ ảnh */
    object-fit: contain;
    margin-right: 10px; /* khoảng cách giữa logo và chữ */
}