:root {
    --bg-color: #121212;
    --surface-color: #1E1E1E;
    --primary-text-color: #EAEAEA;
    --secondary-text-color: #B3B3B3;
    --accent-color: #3E8BFF;
    --accent-color-hover: #5A9BFF;
    --border-color: rgba(255, 255, 255, 0.1);
}

body.dark-theme {
    background-color: var(--bg-color);
    color: var(--primary-text-color);
    font-family: 'Poppins', sans-serif;
}

/* Particles.js container */
#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: -1; /* Place it behind all content */
}

/* --- Header & Nav --- */
header.sticky-top .navbar {
    background-color: rgba(30, 30, 30, 0.5); /* More transparency */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1); /* Subtle border */
}

.navbar-brand, .nav-link {
    color: var(--primary-text-color) !important;
    font-weight: 400;
    transition: color 0.3s ease;
}

.nav-link:hover, .navbar-brand:hover {
    color: var(--accent-color) !important;
}

.navbar-toggler {
    border-color: var(--border-color);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(234, 234, 234, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}


/* --- Hero Section --- */
.hero {
    padding: 8rem 0;
    background: linear-gradient(135deg, var(--bg-color) 0%, #1a1a1a 100%);
    border-bottom: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: #fff;
}

.hero p.lead {
    color: var(--secondary-text-color);
    font-size: 1.25rem;
}

/* --- General Section --- */
.section {
    padding: 5rem 0;
}

.section-title {
    font-weight: 700;
    margin-bottom: 3rem;
    color: #fff;
}

/* --- Buttons --- */
.btn-accent {
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn-accent:hover {
    background-color: var(--accent-color-hover);
    color: #fff;
    transform: translateY(-2px);
}

.btn-outline-accent {
    color: var(--accent-color);
    border-color: var(--accent-color);
    font-weight: 400;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn-outline-accent:hover {
    background-color: var(--accent-color);
    color: #fff;
}


/* --- About Section --- */
.profile-pic {
    border: 5px solid var(--surface-color);
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

/* --- Portfolio Section --- */
.portfolio-item.card {
    background-color: rgba(30, 30, 30, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.portfolio-item.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card-title {
    color: var(--primary-text-color);
}

.card-text {
    color: var(--secondary-text-color);
}

.card-footer {
    background-color: transparent;
    border-top: 1px solid var(--border-color);
}

/* --- Contact Form --- */
.form-control {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--primary-text-color);
    padding: 0.75rem 1rem;
}

.form-control:focus {
    background-color: var(--surface-color);
    border-color: var(--accent-color);
    color: var(--primary-text-color);
    box-shadow: 0 0 0 0.25rem rgba(62, 139, 255, 0.25);
}

.form-label {
    color: var(--secondary-text-color);
}

.form-control::placeholder {
    color: #6c757d;
}

/* --- Footer --- */
footer {
    background-color: var(--surface-color);
    color: var(--secondary-text-color);
    border-top: 1px solid var(--border-color);
}

/* --- AI Chat --- */
.ai-response {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    padding: 1rem;
    margin-top: 1rem;
}

.ai-response pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--primary-text-color);
    margin: 0;
}

/* Tools Page */
.tool-card {
    background-color: rgba(30, 30, 30, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    color: var(--primary-text-color);
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.tool-card h2, .tool-card h3, .tool-card h4, .tool-card h5 {
    color: var(--primary-text-color);
    font-weight: 600;
}

.tool-card p {
    color: var(--secondary-text-color);
}

.tool-card .form-label,
.tool-card label {
    color: var(--secondary-text-color);
}

.tool-card .form-control {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--primary-text-color);
}

.tool-card .form-control:focus {
    background-color: #2a2a2a;
    border-color: var(--accent-color);
    box-shadow: none;
    color: #fff;
}

.user-prompt,
.ai-response {
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    border: 1px solid var(--border-color);
}

.user-prompt strong,
.ai-response strong {
    color: var(--accent-color);
    display: block;
    margin-bottom: 0.5rem;
}