:root {
    --primary-blue: #007bff;
    --dark-bg: #1e1e24;
    --card-bg: #ffffff;
    --text-main: #333333;
    --bg-color: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-main);
}

/* Navigation */
.navbar {
    background-color: #ffffff; 
    color: #333333;
    padding: 10px 30px;
    border-bottom: 1px solid #eeeeee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.logo-link { text-decoration: none; border: none; }
.nav-logo { height: 60px; width: auto; display: block; }

/* Search Bar Styling */
.search-container { flex-grow: 1; max-width: 400px; display: flex; align-items: center; }
.search-input {
    width: 100%; padding: 12px 20px; border-radius: 20px;
    border: 2px solid var(--primary-blue); outline: none; font-size: 14px;
    background-color: #ffffff; color: #333333; transition: 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05); 
}
.search-input::placeholder { color: #666666; font-weight: 500; } 
.search-input:focus { box-shadow: 0 0 10px rgba(0, 123, 255, 0.4); }

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #001F42 0%, #007bff 100%);
    color: white; text-align: center; padding: 80px 20px;
    border-bottom: 5px solid #ff9900; box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.hero h1 { font-size: 3.5em; margin: 0; font-weight: 800; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
.hero p { font-size: 1.4em; margin-top: 15px; color: #e9ecef; }

/* Section Headers */
.section-header {
    max-width: 1200px; margin: 50px auto 20px auto; padding: 0 20px;
    border-bottom: 2px solid #ddd; padding-bottom: 10px;
}
.section-header h2 { font-size: 2em; color: var(--dark-bg); margin: 0; }
.section-header p { color: #666; margin: 5px 0 0 0; font-size: 1.1em; }

/* Project & Tutorial Grids */
.projects-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px; max-width: 1200px; margin: 0 auto 50px auto; padding: 0 20px;
}
.project-card {
    background-color: var(--card-bg); border-radius: 12px; overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08); transition: transform 0.3s, box-shadow 0.3s;
    display: flex; flex-direction: column;
}
.project-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.15); }
.project-image { width: 100%; height: 180px; object-fit: cover; background-color: #e9ecef; display: block; }
.project-info { padding: 20px; flex-grow: 1; display: flex; flex-direction: column; }

.tags { margin-bottom: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
    background-color: #f1f3f5; color: #495057; padding: 4px 10px;
    border-radius: 15px; font-size: 11px; font-weight: bold; text-transform: uppercase;
}
.project-title { font-size: 1.4em; margin: 0 0 10px 0; color: var(--primary-blue); }
.project-desc { font-size: 0.95em; color: #555; margin-bottom: 20px; flex-grow: 1; }

.start-btn {
    display: block; text-align: center; background-color: #002D62; color: white;
    text-decoration: none; padding: 12px; border-radius: 6px; font-weight: bold; transition: 0.3s;
}
.start-btn:hover { background-color: #001F42; }

/* Footer Styling */
.site-footer {
    background-color: var(--dark-bg); color: #f8f9fa; padding: 50px 20px 20px 20px;
    margin-top: 60px; border-top: 5px solid var(--primary-blue);
}
.footer-content {
    max-width: 1200px; margin: 0 auto; display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; margin-bottom: 40px;
}
.footer-section h3 { color: var(--primary-blue); margin-bottom: 20px; font-size: 1.2em; }
.footer-section p { color: #aaa; line-height: 1.6; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { color: #aaa; text-decoration: none; transition: color 0.3s; }
.footer-links a:hover { color: white; padding-left: 5px; }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 1px solid #333; color: #777; font-size: 0.9em; }

/* CHATBOT CSS */
.chatbot-toggle-btn {
    position: fixed; bottom: 30px; right: 30px; background-color: #ff9900; color: #1e1e24; border: none;
    padding: 15px 25px; border-radius: 30px; font-size: 16px; font-weight: 900;
    cursor: pointer; box-shadow: 0 4px 15px rgba(0,0,0,0.3); z-index: 1000; transition: 0.3s;
}
.chatbot-toggle-btn:hover { background-color: #e68a00; transform: scale(1.05); }

.chatbot-container {
    position: fixed; bottom: 90px; right: 30px; width: 350px; background-color: white; border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3); display: flex; flex-direction: column;
    overflow: hidden; z-index: 1000; border: 2px solid var(--primary-blue); transition: all 0.3s ease;
}
.chatbot-container.hidden { display: none; }

.chatbot-container.maximized {
    width: 80vw !important; height: 85vh !important; right: 10vw !important; bottom: 5vh !important;
}

.chatbot-header {
    background: linear-gradient(135deg, #001F42 0%, #007bff 100%);
    color: white; padding: 15px; display: flex; justify-content: space-between; align-items: center;
}
.close-btn { background: none; border: none; color: white; cursor: pointer; font-size: 18px; font-weight: bold; }

.chat-window {
    height: 350px; padding: 15px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; background-color: #f8f9fa;
}
.chatbot-container.maximized .chat-window { height: calc(85vh - 130px) !important; }

.chat-message { 
    padding: 10px 15px; border-radius: 15px; max-width: 80%; font-size: 14px; 
    line-height: 1.4; white-space: pre-wrap; 
}
.bot-message { background-color: #e9ecef; align-self: flex-start; color: #333; }
.user-message { background-color: var(--primary-blue); color: white; align-self: flex-end; }

.chat-input-area { display: flex; padding: 10px; border-top: 1px solid #ddd; background-color: white; }
#chatInput { flex-grow: 1; padding: 10px; border: 1px solid #ccc; border-radius: 20px; outline: none; }
#chatInput:focus { border-color: var(--primary-blue); }
.send-btn {
    background-color: var(--primary-blue); color: white; border: none; padding: 10px 15px; 
    margin-left: 10px; border-radius: 20px; cursor: pointer; font-weight: bold;
}
.send-btn:hover { background-color: #0056b3; }

/* Mobile Adjustments */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.2em; }
    .section-header h2 { font-size: 1.6em; }
    .search-container { max-width: 100%; order: 3; width: 100%; }
}