@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

* {
    font-family: 'Poppins', sans-serif;
}

h1{
    color: black;
}

body {
    padding-top: 70px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    box-shadow: 0 4px 20px rgba(0,0,0,.2);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.nav-link {
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

.container {
    position: relative;
    z-index: 1;
}

.section-title {
    margin-top: 3rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    position: relative;
    animation: fadeInUp 0.6s ease;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.example-box {
    background: rgba(255, 255, 255, 0.95);
    border: none;
    border-radius: 15px;
    padding: 2rem;
    margin: 1.5rem 0;
    box-shadow: 0 8px 32px rgba(0,0,0,.1);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.example-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,.15);
}

.code-preview {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #e0e0e0;
    padding: 1.5rem;
    border-radius: 12px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    box-shadow: 0 8px 24px rgba(0,0,0,.2);
    border: 1px solid rgba(255,255,255,.1);
    position: relative;
}

.code-preview::before {
    content: '< CODE />';
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 0.7rem;
    color: rgba(255,255,255,.4);
    font-weight: 600;
}

.demo-section {
    margin: 2.5rem 0;
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,.15);
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.6s ease;
    border: 1px solid rgba(255,255,255,.5);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.color-box {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    border-radius: 12px;
    margin: 0.5rem 0;
    box-shadow: 0 4px 15px rgba(0,0,0,.2);
    transition: all 0.3s ease;
    cursor: pointer;
}

.color-box:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0,0,0,.3);
}

.spacing-demo {
    background: linear-gradient(135deg, #e0f7fa 0%, #e1bee7 100%);
    border: 2px dashed #667eea;
    margin: 0.5rem 0;
    padding: 1rem;
    border-radius: 10px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.spacing-demo:hover {
    background: linear-gradient(135deg, #b2ebf2 0%, #ce93d8 100%);
    transform: scale(1.02);
}

.info-card {
    border-left: 5px solid #667eea;
    background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateX(5px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
}

.warning-card {
    border-left: 5px solid #ffc107;
    background: linear-gradient(135deg, #fff8e1 0%, #ffecb3 100%);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(255, 193, 7, 0.2);
}

.tip-card {
    border-left: 5px solid #4caf50;
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.2);
}

.practice-card {
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border-radius: 15px;
    overflow: hidden;
}

.practice-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0,0,0,.25);
}

.challenge-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2.5rem;
    border-radius: 20px;
    margin: 1.5rem 0;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.challenge-box::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.challenge-box h2 {
    position: relative;
    z-index: 1;
    font-weight: 700;
}

.challenge-box p {
    position: relative;
    z-index: 1;
}

.result-area {
    min-height: 200px;
    border: 3px dashed rgba(102, 126, 234, 0.3);
    border-radius: 15px;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    box-shadow: inset 0 2px 10px rgba(0,0,0,.05);
    transition: all 0.3s ease;
}

.result-area:hover {
    border-color: rgba(102, 126, 234, 0.6);
    background: white;
}

.btn {
    border-radius: 10px;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,.3);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.btn-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-danger {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.card {
    border: none;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0,0,0,.15);
    transition: all 0.4s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,.25);
}

.form-control, .form-select {
    border-radius: 10px;
    border: 2px solid #e0e0e0;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

textarea.form-control {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

h1, h2, h3, h4, h5 {
    font-weight: 700;
}

.display-4 {
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.table {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,.1);
}

.alert {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,.1);
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 600;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}