/* =========================================
   1. ROOT VARIABLES (LIGHT MODE)
========================================= */
:root {
    /* We keep the class names like 'btn-blue' so HTML doesn't break, 
       but we force the actual color to be pure Black! */
    --primary-blue: #000000; 
    --btn-text-color: #ffffff; 
    
    --dark-text: #111111;
    --gray-text: #666666;
    --border: #e0e0e0;
    --bg-light: #f9f9f9;
    --main-bg: #ffffff;
    --main-bg-rgb: 255, 255, 255; /* Added for translucent navbar */
    --chat-bg: #ffffff;
}

/* =========================================
   2. DARK MODE VARIABLES
========================================= */
body.dark-mode {
    /* Everything inverts: "Blue" becomes pure White */
    --primary-blue: #ffffff; 
    --btn-text-color: #000000; 
    
    --dark-text: #f5f5f5;
    --gray-text: #aaaaaa;
    --border: #333333;
    --bg-light: #0a0a0a; 
    --main-bg: #000000;  
    --main-bg-rgb: 0, 0, 0; /* Added for translucent navbar */
    --chat-bg: #111111;
}

/* =========================================
   3. GLOBAL STYLES
========================================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    /* Hacker aesthetic font applied globally */
    font-family: 'Fira Code', monospace;
    background-color: var(--main-bg);
    color: var(--dark-text);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4 {
    color: var(--dark-text);
    font-weight: 600;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* =========================================
   4. NAVIGATION
========================================= */
nav {
    padding: 20px 0;
    /* LIQUID GLASS EFFECT */
    background-color: rgba(var(--main-bg-rgb), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px); /* For Safari */
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.nav-links a {
    margin-left: 30px;
    color: var(--dark-text);
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--gray-text);
}

.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--main-bg);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.active {
        display: flex;
    }
    .nav-links a {
        margin: 10px 0;
    }
}

/* =========================================
   5. BUTTONS (MONOCHROME)
========================================= */
.btn-blue {
    background-color: var(--primary-blue);
    color: var(--btn-text-color);
    border: 2px solid var(--primary-blue);
    padding: 12px 24px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-family: inherit;
    font-weight: 500;
    display: inline-block;
}

.btn-blue:hover {
    background-color: transparent;
    color: var(--primary-blue);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
    padding: 12px 24px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-family: inherit;
    font-weight: 500;
    display: inline-block;
}

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

/* =========================================
   6. LAYOUT & CARDS
========================================= */
.section-title {
    margin-bottom: 40px;
    font-size: 2rem;
}

.bg-light {
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
}

.card {
    background-color: var(--bg-light);
    border: 1px solid var(--border);
    padding: 30px;
    transition: transform 0.2s;
}

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

.card h3 {
    margin-bottom: 15px;
    color: var(--primary-blue);
}

/* =========================================
   7. FORMS
========================================= */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input, 
.form-group textarea {
    width: 100%;
    padding: 12px;
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--dark-text);
    font-family: 'Fira Code', monospace;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus, 
.form-group textarea:focus {
    border-color: var(--primary-blue);
}

/* =========================================
   8. FOOTER
========================================= */
footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    text-align: center;
    margin-top: 60px;
}

.social-links {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-links a {
    font-size: 1.5rem;
    color: var(--gray-text);
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--primary-blue);
}

/* =========================================
   9. FLOATING WIDGETS (THEME & CHAT)
========================================= */
.theme-toggle-fab {
    position: fixed;
    bottom: 30px;
    left: 30px;
    z-index: 1000;
}

.chat-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
}

.chat-window {
    display: none;
    position: absolute;
    bottom: 50px;
    right: 0;
    width: 320px;
    background-color: var(--chat-bg);
    border: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    flex-direction: column;
}

.chat-window.open {
    display: flex;
}

.chat-header {
    padding: 15px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-messages {
    height: 300px;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
}

.message {
    padding: 10px 15px;
    margin-bottom: 10px;
    max-width: 85%;
    font-size: 0.9rem;
}

.message.bot {
    background-color: var(--bg-light);
    border: 1px solid var(--border);
    align-self: flex-start;
}

.message.user {
    background-color: var(--primary-blue);
    color: var(--btn-text-color);
    align-self: flex-end;
}

.typing-indicator {
    display: none;
    padding: 0 15px 10px;
    font-size: 0.8rem;
    color: var(--gray-text);
}

.chat-input {
    display: flex;
    border-top: 1px solid var(--border);
    padding: 10px;
}

.chat-input input {
    flex-grow: 1;
    background: transparent;
    border: none;
    color: var(--dark-text);
    font-family: inherit;
    outline: none;
}

.chat-input button {
    background: transparent;
    border: none;
    color: var(--primary-blue);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0 10px;
}