:root {
    --primary-color: #3f51b5;
    --secondary-color: #f5f5f5;
    --accent-color: #ff4081;
    --text-color: #212121;
    --light-text: #757575;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Hero Section */
.hero {
    background-color: var(--primary-color);
    color: white;
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.hero h1 {
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Section Titles */
.section-title {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.subsection-title {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

/* Feature Cards */
.feature-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 1.5rem;
    height: 100%;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Navigation Pills */
.nav-pills .nav-link.active {
    background-color: var(--primary-color);
}

.nav-pills .nav-link {
    color: var(--text-color);
}

/* Images */
.wireframe-img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.architecture-img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin: 1.5rem 0;
}

/* Timeline */
.timeline-item {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 2rem;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 1px;
    height: 100%;
    background-color: var(--primary-color);
}

.timeline-item::after {
    content: "";
    position: absolute;
    left: -5px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--primary-color);
}

.timeline-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Documentation */
.doc-header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    margin-bottom: 2rem;
}

.doc-nav {
    position: sticky;
    top: 2rem;
}

.doc-nav .nav-link {
    color: var(--text-color);
    padding: 0.5rem 1rem;
}

.doc-nav .nav-link.active {
    background-color: var(--primary-color);
    color: white;
    border-radius: 4px;
}

.doc-content img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin: 1.5rem 0;
}

/* Code and API Endpoints */
pre {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
}

code {
    color: #d63384;
}

.api-endpoint {
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 0 4px 4px 0;
}

.api-endpoint h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.api-method {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: bold;
    margin-right: 0.5rem;
}

.api-method.get {
    background-color: #61affe;
    color: white;
}

.api-method.post {
    background-color: #49cc90;
    color: white;
}

.api-method.put {
    background-color: #fca130;
    color: white;
}

.api-method.delete {
    background-color: #f93e3e;
    color: white;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .hero {
        padding: 2rem 0;
    }
    
    .feature-card {
        margin-bottom: 1rem;
    }
    
    .doc-nav {
        position: relative;
        margin-bottom: 2rem;
    }
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Button Styles */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #303f9f;
    border-color: #303f9f;
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Card Styles */
.card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.card-img-top {
    height: 200px;
    object-fit: cover;
}

/* Utility Classes */
.text-primary {
    color: var(--primary-color) !important;
}

.bg-primary {
    background-color: var(--primary-color) !important;
}

.border-primary {
    border-color: var(--primary-color) !important;
}