/* Modern Skill World4u Platform Styles */

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --neon-cyan: #00f0ff;
    --neon-purple: #b026ff;
    --neon-blue: #0066ff;
    --dark-bg: #0a0e27;
    --dark-card: rgba(15, 23, 42, 0.8);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark-bg);
    color: #fff;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Animated Background */
.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 50%, #0a0e27 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.animated-bg::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(182, 38, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(0, 240, 255, 0.1) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Glassmorphism Cards */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
    border-color: rgba(102, 126, 234, 0.5);
}

/* Neon Gradient Text */
.neon-text {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.5); }
}

/* Buttons */
.btn-neon {
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
    border: none;
    color: #fff;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-neon::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.btn-neon:hover::before {
    left: 100%;
}

.btn-neon:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.6);
}

.btn-outline-neon {
    background: transparent;
    border: 2px solid var(--neon-cyan);
    color: var(--neon-cyan);
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-outline-neon:hover {
    background: var(--neon-cyan);
    color: var(--dark-bg);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
}

/* Navigation */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-link {
    color: #fff !important;
    margin: 0 10px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--neon-cyan);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0;
    position: relative;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Stats Cards */
.stats-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.stats-card:hover {
    transform: translateY(-10px);
    border-color: var(--neon-cyan);
}

.stats-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

/* Dashboard */
.dashboard-header {
    padding: 2rem 0;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 2rem;
}

.income-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.income-card:hover {
    transform: translateY(-5px);
    border-color: var(--neon-cyan);
}

.income-label {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 0.5rem;
}

.income-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--neon-cyan);
}

/* Binary Tree */
.binary-tree-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    margin: 2rem 0;
    overflow-x: auto;
}

.tree-node {
    display: inline-block;
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
    color: #fff;
    padding: 10px 20px;
    border-radius: 10px;
    margin: 10px;
    position: relative;
    min-width: 120px;
    text-align: center;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.tree-node.current-user {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
}

/* Forms */
.form-control {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: #fff;
    border-radius: 10px;
    padding: 12px 15px;
    transition: all 0.3s ease;
}

.form-control:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--neon-cyan);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
    color: #fff;
}

.form-control::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

/* Course Cards */
.course-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
    border-color: var(--neon-cyan);
}

.course-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
}

.course-content {
    padding: 1.5rem;
}

.course-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--neon-cyan);
}

/* Rank Badge */
.rank-badge {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
    margin: 5px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* Package Cards */
.package-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 2px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.package-card.featured {
    border-color: var(--neon-cyan);
    transform: scale(1.05);
}

.package-card.featured::before {
    content: 'POPULAR';
    position: absolute;
    top: 20px;
    right: -30px;
    background: var(--neon-cyan);
    color: var(--dark-bg);
    padding: 5px 40px;
    transform: rotate(45deg);
    font-weight: 700;
    font-size: 0.8rem;
}

.package-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: var(--neon-purple);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.package-price {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 1rem 0;
}

/* Progress Bar */
.progress {
    background: var(--glass-bg);
    border-radius: 50px;
    height: 10px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
    border-radius: 50px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

/* Tables */
.table {
    color: #fff;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 15px;
    overflow: hidden;
}

.table thead {
    background: rgba(102, 126, 234, 0.2);
}

.table tbody tr {
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.table tbody tr:hover {
    background: rgba(102, 126, 234, 0.1);
}

/* Alerts */
.alert {
    border-radius: 10px;
    border: none;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
}

.alert-success {
    background: rgba(0, 255, 0, 0.1);
    color: #00ff00;
    border-left: 4px solid #00ff00;
}

.alert-danger {
    background: rgba(255, 0, 0, 0.1);
    color: #ff4444;
    border-left: 4px solid #ff4444;
}

.alert-info {
    background: rgba(0, 240, 255, 0.1);
    color: var(--neon-cyan);
    border-left: 4px solid var(--neon-cyan);
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .stats-number {
        font-size: 2rem;
    }
    
    .package-card.featured {
        transform: scale(1);
    }
    
    .hero-content p.lead {
        font-size: 1rem;
    }
}

/* Loading Animation */
.loader {
    border: 4px solid var(--glass-border);
    border-top: 4px solid var(--neon-cyan);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
}