/* CSS Variables for Theming */
:root {
    /* Dark Mode (Default) */
    --bg-primary: #0a0e17;
    --bg-secondary: #1a202c;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --accent-primary: #34d399; /* Neon Green */
    --accent-secondary: #3b82f6; /* Neon Blue */
    --border-color: #2d3748;
}

[data-theme="light"] {
    /* Light Mode */
    --bg-primary: #f7fafc;
    --bg-secondary: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --accent-primary: #2f855a;
    --accent-secondary: #3182ce;
    --border-color: #e2e8f0;
}

/* Base Styles */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background-color: #2c9a72;
}

/* Preloader */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease-out;
}
#preloader.loaded {
    opacity: 0;
    pointer-events: none;
}
.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* App Content (hidden until loaded) */
#app-content {
    display: none;
}

/* Card Styles */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem; /* 8px */
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 15px -3px rgba(52, 211, 153, 0.1), 0 4px 6px -2px rgba(52, 211, 153, 0.05);
}

/* Modal Styles */
#modal {
    transition: opacity 0.3s ease-in-out;
}
#modal-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    max-height: 90vh;
    overflow-y: auto;
}

/* Button */
.btn-primary {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    transition: background-color 0.3s ease;
}
.btn-primary:hover {
    background-color: #2c9a72;
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.btn-secondary:hover {
    background-color: var(--bg-primary);
    border-color: var(--accent-primary);
}

/* Neon Text */
.text-neon {
    color: var(--accent-primary);
}

/* Fade-in Animation on Scroll */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}