/* 
 * DerivLingo - Duolingo Inspired Design
 * Color Scheme: Deriv Green (#00A382), White, Light Gray
 */

:root {
    --primary: #00A382;
    --primary-dark: #008C6A;
    --primary-light: #E5F6F2;
    --secondary: #FFB74D;
    --success: #58CC02;
    --danger: #FF4B4B;
    --warning: #FFC800;
    --text-dark: #1F1F1F;
    --text-gray: #777777;
    --text-light: #AFB1B6;
    --bg-light: #F9F9FA;
    --bg-white: #FFFFFF;
    --border-light: #E5E5E5;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 20px rgba(0,163,130,0.15);
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Duolingo Style Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation - Like Duolingo */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 12px 0;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--secondary);
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s;
}

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

.nav-link.active {
    background: var(--primary);
    color: white;
}

/* User Streak Badge - Gamification */
.streak-badge {
    background: var(--warning);
    color: var(--text-dark);
    padding: 6px 14px;
    border-radius: 30px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.streak-badge i {
    font-size: 18px;
}

/* Duolingo Cards */
.lesson-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.lesson-card.completed {
    border-left: 8px solid var(--success);
}

.lesson-card.in-progress {
    border-left: 8px solid var(--secondary);
}

/* Progress Bar - Duolingo Style */
.progress-container {
    background: var(--bg-light);
    border-radius: 30px;
    height: 12px;
    overflow: hidden;
    margin: 16px 0;
}

.progress-bar {
    background: var(--primary);
    height: 100%;
    border-radius: 30px;
    transition: width 0.5s ease;
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Buttons - Duolingo Style */
.btn {
    padding: 14px 28px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 16px;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 6px 0 var(--primary-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 0 var(--primary-dark);
}

.btn-primary:active {
    transform: translateY(4px);
    box-shadow: 0 2px 0 var(--primary-dark);
}

.btn-secondary {
    background: var(--secondary);
    color: white;
    box-shadow: 0 6px 0 #E69C2C;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary-light);
}

.btn-large {
    padding: 18px 36px;
    font-size: 18px;
}

/* Lesson Content Styling */
.lesson-content {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: 40px;
    margin: 30px 0;
    box-shadow: var(--shadow);
}

.lesson-content h1 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.lesson-content h2 {
    font-size: 28px;
    margin: 30px 0 15px;
    color: var(--primary-dark);
}

.lesson-content p {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: var(--text-gray);
}

.highlight-box {
    background: var(--primary-light);
    border-radius: var(--border-radius);
    padding: 30px;
    margin: 30px 0;
    border-left: 6px solid var(--primary);
}

.tip-card {
    background: var(--warning);
    color: var(--text-dark);
    padding: 20px;
    border-radius: var(--border-radius);
    margin: 20px 0;
    font-weight: 500;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 30px;
}

.stat-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    margin: 10px 0;
}

.stat-label {
    color: var(--text-gray);
    font-size: 16px;
}

/* Certificate Design */
.certificate {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px;
    border-radius: 20px;
    color: white;
    text-align: center;
}

.certificate h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-content {
        flex-direction: column;
        gap: 16px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .lesson-content {
        padding: 20px;
    }
    
    .lesson-content h1 {
        font-size: 28px;
    }
    
    .btn {
        padding: 12px 24px;
        width: 100%;
    }
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: slideIn 0.6s ease forwards;
}

/* XP Badge */
.xp-badge {
    background: var(--success);
    color: white;
    padding: 6px 12px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* Affiliate Banner */
.affiliate-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    margin: 20px 0;
    text-align: center;
}

.affiliate-link {
    background: white;
    color: var(--primary);
    padding: 10px 20px;
    border-radius: 30px;
    display: inline-block;
    margin-top: 10px;
    font-weight: 600;
}