/* Professional Dark Theme */
:root {
    --primary-color: #3B82F6; /* Professional Blue */
    --secondary-color: #000000; /* Pure Black */
    --accent-color: #EF4444; /* Professional Red */
    --accent-green: #10B981; /* Professional Green */
    --text-light: #FFFFFF;
    --text-muted: #9CA3AF;
    --text-dark: #374151;
    --glass-bg: rgba(17, 24, 39, 0.95);
    --glass-border: rgba(75, 85, 99, 0.2);
    --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.8), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
    --gradient: linear-gradient(135deg, var(--primary-color), #1D4ED8);
    --border-radius: 12px;
}

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

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #000000;
    min-height: 100vh;
    color: var(--text-light);
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Professional Glass morphism */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.glass::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0.4;
}

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

/* Professional Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.25rem 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

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

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-light);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.95rem;
}

.nav a:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

/* Main content */
.main {
    margin-top: 100px;
    padding: 4rem 0;
}

/* Professional Hero section */
.hero {
    text-align: center;
    padding: 4rem 0;
    position: relative;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
    font-weight: 400;
}

/* Professional Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--gradient);
    color: var(--text-light);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    box-shadow: none;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--text-light);
}

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

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
    border-color: rgba(59, 130, 246, 0.3);
}

.card h2 {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.card h3 {
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
}

/* Requirement Items */
.requirement-item {
    text-align: center;
    padding: 1.5rem;
    background: rgba(17, 24, 39, 0.5);
    border-radius: 12px;
    border: 1px solid rgba(75, 85, 99, 0.2);
    transition: all 0.3s ease;
}

.requirement-item:hover {
    background: rgba(17, 24, 39, 0.7);
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateY(-2px);
}

.requirement-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.requirement-item h3 {
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.requirement-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.4;
}

/* Professional Form styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 1rem 1.25rem;
    background: rgba(17, 24, 39, 0.8);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background: rgba(17, 24, 39, 0.9);
}

.form-control::placeholder {
    color: var(--text-muted);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

/* Professional Error messages */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: #EF4444;
    color: #FCA5A5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: #10B981;
    color: #6EE7B7;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: #F59E0B;
    color: #FCD34D;
}

/* Professional User info */
.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--glass-bg);
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--glass-border);
}

.user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
}

.user-details h3 {
    color: var(--text-light);
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.user-details p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Professional Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Professional Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .requirement-item {
        padding: 1rem;
    }
    
    .requirement-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Professional Loading spinner */
.spinner {
    border: 4px solid rgba(59, 130, 246, 0.3);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* Professional Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #000000;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1D4ED8;
}