/* NLP Course for Indian Working Professionals - Main Stylesheet */

:root {
    --primary-color: #FF6B35;
    --secondary-color: #4ECDC4;
    --accent-color: #FFD93D;
    --success-color: #6BCF7F;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --white: #FFFFFF;
    --border-color: #E0E0E0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

/* Navigation Bar */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), #FF8C61);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--secondary-color), #7BDFD7);
    color: var(--white);
    padding: 4rem 2rem;
    text-align: center;
    border-radius: 15px;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-lg);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    animation: fadeInDown 0.8s ease;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease;
}

/* Module Cards */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.module-card {
    background: var(--white);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.module-number {
    background: linear-gradient(135deg, var(--primary-color), #FF8C61);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.module-card h3 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.module-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.module-link {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.module-link:hover {
    background: #3DB8B0;
}

/* Content Sections */
.content-section {
    background: var(--white);
    border-radius: 15px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.section-title {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-icon {
    font-size: 2.5rem;
}

/* Learning Objectives */
.objectives-box {
    background: linear-gradient(135deg, #FFF3E0, #FFE0B2);
    border-left: 5px solid var(--accent-color);
    padding: 1.5rem;
    border-radius: 10px;
    margin: 2rem 0;
}

.objectives-box h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.objectives-list {
    list-style: none;
    padding-left: 0;
}

.objectives-list li {
    padding: 0.5rem 0;
    padding-left: 2rem;
    position: relative;
}

.objectives-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* Story Box */
.story-box {
    background: linear-gradient(135deg, #E8F5E9, #C8E6C9);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    border-left: 5px solid var(--success-color);
}

.story-box h3 {
    color: var(--success-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.story-content {
    font-style: italic;
    line-height: 1.8;
    color: var(--text-dark);
}

/* Example Box */
.example-box {
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    border-left: 5px solid var(--secondary-color);
}

.example-box h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Key Points Box */
.key-points {
    background: linear-gradient(135deg, #FCE4EC, #F8BBD0);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
}

.key-points h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.points-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.point-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.point-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Interactive Quiz */
.quiz-container {
    background: var(--white);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-lg);
}

.quiz-header {
    text-align: center;
    margin-bottom: 2rem;
}

.quiz-header h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.question {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
}

.question h4 {
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.option {
    background: var(--white);
    padding: 1rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.option:hover {
    border-color: var(--secondary-color);
    background: #F0FFFE;
}

.option.selected {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, #E0F7FA, #B2EBF2);
}

.option.correct {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #E8F5E9, #C8E6C9);
}

.option.incorrect {
    border-color: #F44336;
    background: linear-gradient(135deg, #FFEBEE, #FFCDD2);
}

.submit-quiz {
    background: linear-gradient(135deg, var(--primary-color), #FF8C61);
    color: var(--white);
    padding: 1rem 3rem;
    border: none;
    border-radius: 25px;
    font-size: 1.1rem;
    cursor: pointer;
    display: block;
    margin: 2rem auto;
    transition: transform 0.3s ease;
}

.submit-quiz:hover {
    transform: scale(1.05);
}

.quiz-result {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    margin-top: 2rem;
    display: none;
}

.quiz-result.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

.score-display {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 1rem 0;
}

/* Drag and Drop Exercise */
.drag-drop-container {
    background: var(--white);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-lg);
}

.drag-items {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 10px;
    min-height: 100px;
}

.drag-item {
    background: linear-gradient(135deg, var(--secondary-color), #7BDFD7);
    color: var(--white);
    padding: 1rem 1.5rem;
    border-radius: 10px;
    cursor: move;
    user-select: none;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.drag-item:hover {
    transform: scale(1.05);
}

.drag-item.dragging {
    opacity: 0.5;
}

.drop-zones {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.drop-zone {
    background: var(--bg-light);
    border: 3px dashed var(--border-color);
    border-radius: 10px;
    padding: 2rem;
    min-height: 150px;
    transition: all 0.3s ease;
}

.drop-zone h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
}

.drop-zone.drag-over {
    border-color: var(--secondary-color);
    background: #E0F7FA;
}

.drop-zone.correct {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #E8F5E9, #C8E6C9);
}

/* Practice Exercise */
.practice-box {
    background: linear-gradient(135deg, #FFF9C4, #FFF59D);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    border-left: 5px solid var(--accent-color);
}

.practice-box h3 {
    color: #F57F17;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.exercise-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    margin: 1rem 0;
    font-family: inherit;
}

.exercise-input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

/* Summary Box */
.summary-box {
    background: linear-gradient(135deg, #E1BEE7, #CE93D8);
    border-radius: 15px;
    padding: 2.5rem;
    margin: 3rem 0;
}

.summary-box h3 {
    color: #6A1B9A;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.summary-points {
    list-style: none;
    padding: 0;
}

.summary-points li {
    background: var(--white);
    padding: 1rem 1.5rem;
    margin: 1rem 0;
    border-radius: 10px;
    padding-left: 3rem;
    position: relative;
}

.summary-points li:before {
    content: "📌";
    position: absolute;
    left: 1rem;
    font-size: 1.2rem;
}

/* Navigation Buttons */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    margin: 3rem 0;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #FF8C61);
    color: var(--white);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), #7BDFD7);
    color: var(--white);
}

.btn-secondary:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* Progress Bar */
.progress-container {
    background: var(--white);
    border-radius: 15px;
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.progress-bar {
    background: var(--bg-light);
    height: 30px;
    border-radius: 15px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    background: linear-gradient(135deg, var(--success-color), #8FD99E);
    height: 100%;
    border-radius: 15px;
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: bold;
}

/* Infographic Styles */
.infographic {
    background: var(--white);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.info-item {
    text-align: center;
    padding: 1.5rem;
    border-radius: 10px;
    background: var(--bg-light);
    transition: transform 0.3s ease;
}

.info-item:hover {
    transform: translateY(-5px);
}

.info-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.info-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }
    
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .modules-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 1rem;
    }
    
    .content-section {
        padding: 1.5rem;
    }
    
    .nav-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .nav-buttons,
    .quiz-container,
    .drag-drop-container {
        display: none;
    }
    
    .content-section {
        box-shadow: none;
        page-break-inside: avoid;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus Styles */
a:focus,
button:focus,
input:focus,
.option:focus {
    outline: 3px solid var(--secondary-color);
    outline-offset: 2px;
}