body {
    font-family: 'Inter', sans-serif;
    background-color: #0f172a; 
    color: #e2e8f0;
}
 
/* Unified Dark Theme */
#landing-page, #app-container, .main-content, .sidebar {
    background: #0f172a;
}

/* Landing Page Styles with Background Image */
#landing-page {
    /* FIX: Added a background image with a dark overlay for text readability */
    background: 
        linear-gradient(rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.9)),
        url('https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?ixlib=rb-4.0.3&auto=format&fit=crop&w=2000&q=80') no-repeat center center;
    background-size: cover;
    position: relative;
    z-index: 1;
}


/* Glassmorphism Card Style */
.card, .feature-card, #auth-box {
    background-color: rgba(30, 41, 59, 0.5); /* Semi-transparent slate */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}
.card:hover, .feature-card:hover {
    transform: translateY(-8px);
    background-color: rgba(30, 41, 59, 0.8);
    border-color: rgba(16, 185, 129, 0.5); /* Greenish border on hover */
}

/* Auth Modal Styles */
#auth-modal {
    background-color: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    transition: opacity 0.3s ease-in-out;
}
.login-input {
    background-color: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}
.login-input:focus {
    border-color: #10b981; /* Emerald Green */
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.5);
}

/* Main App Styles */
.main-content { color: #d1d5db; }
.text-main-header { color: #f9fafb; }
.text-main-subheader { color: #9ca3af; }
 
.card {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease forwards;
}
@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.btn-primary {
    background: linear-gradient(90deg, #10b981 0%, #059669 100%); /* Emerald Green Gradient */
    color: white;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.2);
}
.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3);
    transform: translateY(-2px);
}
.sidebar {
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}
.nav-link.active {
    background-color: rgba(16, 185, 129, 0.1);
    border-left: 4px solid #10b981;
    color: #f9fafb;
}
.loader {
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top: 4px solid #10b981;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}
input[type="range"]::-webkit-slider-thumb {
    background: #10b981;
}
input[type="range"]::-moz-range-thumb {
    background: #10b981;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* AI Chat Styles */
#ai-chat-modal {
    background-color: #1f2937; /* Darker slate */
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: translateY(20px);
}
.chat-message {
    max-width: 80%;
    padding: 10px 15px;
    border-radius: 15px;
    margin-bottom: 10px;
}
.user-message {
    background-color: #10b981;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}
.ai-message {
    background-color: #374151; /* Gray-blue */
    color: #e5e7eb;
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}
.prompt-starter {
    background-color: transparent;
    border: 1px solid #4b5563;
    color: #9ca3af;
    transition: all 0.2s ease;
}
.prompt-starter:hover {
    background-color: #374151;
    border-color: #6b7280;
    color: #e5e7eb;
}