/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Arial', sans-serif, Helvetica, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* CSS Variables */
:root {
    --bg-color: #f0f4f8;
    --text-color: #333;
    --accent-color: #007bff;
    --secondary-color: #6c757d;
    --navbar-bg: black;
    --navbar-text: white;
    --button-bg: black;
    --button-hover-bg: red;
    --button-text: white;
    --footer-bg: black;
    --box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    --card-bg: white;
    --screen-bg: #f9f9f9;
    --border-color: #ddd;
}
.navbar-logo i {
    font-size: 24px;
    color: white; /* Matches navbar text */
    margin-right: 10px; /* Space between icon and text */
    vertical-align: middle;
  }
  

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: #121212;
    --text-color: #f0f4f8;
    --accent-color: black;
    --navbar-bg: #1e1e1e;
    --navbar-text: #f0f4f8;
    --button-bg: #444;
    --button-hover-bg: #555;
    --footer-bg: #1e1e1e;
    --card-bg: #1e1e1e;
    --screen-bg: #2a2a2a;
    --border-color: #444;
}

/* Navbar */
.navbar {
    width: 100%;
    background-color: var(--navbar-bg);
    color: var(--navbar-text);
    padding: 10px 20px;
    position: fixed;
    top: 0;
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

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

.navbar-logo {
    font-size: 1.25rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav-list li {
    display: inline;
}

.nav-list a {
    color: var(--navbar-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.nav-list a:hover {
    color: var(--accent-color);
}

.dark-mode-btn {
    padding: 8px 16px;
    font-size: 0.9rem;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.dark-mode-btn:hover {
    background-color: var(--button-hover-bg);
}

/* Main Content */
.main-container {
    padding: 80px 20px;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Calculator */
.calculator-container {
    display: flex;
    justify-content: center;
    padding: 20px;
}

.calculator {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 15px;
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.calculator h2 {
    margin-bottom: 15px;
    color: var(--text-color);
}

/* Calculator Screen */
.calculator-screen {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    text-align: right;
    background-color: var(--screen-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.calculator-screen:focus {
    border-color: var(--accent-color);
    outline: none;
}

/* Button Grid */
.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 10px;
}

button {
    padding: 15px;
    font-size: 1rem;
    color: var(--button-text);
    background-color: var(--button-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
    background-color: var(--button-hover-bg);
    transform: scale(1.05);
}

button:focus {
    outline: 2px solid var(--accent-color);
}

.reset-btn {
    grid-column: span 4;
    background-color: #d9534f;
    font-weight: bold;
}

.reset-btn:hover {
    background-color: #c9302c;
}

/* Result Display */
.result-display {
    background: var(--screen-bg);
    padding: 15px;
    margin-top: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 1rem;
    color: var(--text-color);
    box-shadow: var(--box-shadow);
}

/* Guide Section */
.guide,
.examples {
    background: var(--card-bg);
    padding: 20px;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    color: var(--text-color);
}

.guide h2,
.examples h2 {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.examples ul {
    list-style-type: disc;
    margin-left: 20px;
}

.examples h3 {
    font-size: 1.1rem;
    margin-top: 10px;
}

/* Footer */
.footer {
    width: 100%;
    background: var(--footer-bg);
    color: var(--text-color);
    text-align: center;
    padding: 10px 0;
    margin-top: auto;
    box-shadow: var(--box-shadow);
    color: white;
}

/* Media Queries */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-list {
        flex-direction: column;
        gap: 10px;
    }

    .calculator {
        padding: 15px;
    }

    .button-grid {
        grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
        gap: 8px;
    }

    .dark-mode-btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
}