/* --- Basic Setup & CSS Variables --- */
:root {
    --bg-dark: #121828;
    --bg-light: #1b2133;
    --primary-accent: #00f5c3;
    --text-light: #edf2f7;
    --text-medium: #a0aec0;
    --text-dark: #121828;
    --border-color: #2d3748;
    --success-color: #48bb78;
    --error-color: #f56565;
    --font-family: 'Poppins', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

a {
    text-decoration: none;
    color: var(--primary-accent);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--text-light);
}

h1, h2, h3 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); text-align: center; }
h3 { font-size: 1.5rem; }

    /* --- Sidebar & Hamburger Menu --- */
#menu-toggle {
    display: none; /* Hidden by default on desktop */
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1001; /* Above the header background */
}

#sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100%;
    background: var(--bg-light);
    z-index: 2000;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform 0.4s ease-in-out;
    border-right: 1px solid var(--border-color);
}

#sidebar.active {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}

#close-sidebar {
    background: none;
    border: none;
    color: var(--text-medium);
    font-size: 2rem;
    cursor: pointer;
    transition: color 0.3s;
}
#close-sidebar:hover {
    color: var(--primary-accent);
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li a {
    display: block;
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 600;
    padding: 1rem 0;
    transition: color 0.3s ease;
}

.sidebar-nav li a:hover {
    color: var(--primary-accent);
}

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease-in-out;
}

#overlay.active {
    opacity: 1;
    pointer-events: auto;
}

      
/* --- Header & Navigation --- */
header {
    background: rgba(18, 24, 40, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0; /* Increased padding */
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: flex-start; /* Changed from space-between */
    align-items: center;
}

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

/* --- Hero Section & Calculator --- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 120px;
    padding-bottom: 60px;
    text-align: center;
    background: linear-gradient(rgba(18, 24, 40, 0.9), rgba(18, 24, 40, 1)), url('https://www.transparenttextures.com/patterns/cubes.png');
}

.hero-content {
    max-width: 800px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-medium);
    margin-bottom: 2.5rem;
}

.calculator-wrapper {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    text-align: left;
    margin: 0 auto;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-bottom: 0.5rem;
}

.form-group input[type="number"] {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    width: 100%;
}
.form-group input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 3px rgba(0, 245, 195, 0.2);
}
input[type="range"] {
    -webkit-appearance: none; appearance: none;
    width: 100%; height: 8px;
    background: var(--bg-dark);
    border-radius: 5px; outline: none; margin-top: 1rem;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none;
    width: 20px; height: 20px;
    background: var(--primary-accent);
    cursor: pointer; border-radius: 50%;
    border: 3px solid var(--bg-light);
}
input[type="range"]::-moz-range-thumb {
    width: 20px; height: 20px;
    background: var(--primary-accent);
    cursor: pointer; border-radius: 50%;
}

.cta-button {
    background: var(--primary-accent);
    color: var(--text-dark);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 700;
    width: 100%;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 2rem;
    transition: all 0.3s ease;
}
.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 245, 195, 0.2);
}

.advanced-options {
    display: flex; align-items: center; gap: 10px; margin-top: 1.5rem;
    color: var(--text-medium); font-size: 0.9rem;
}
.switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; border-radius: 22px;}
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%;}
input:checked + .slider { background-color: var(--primary-accent); }
input:checked + .slider:before { transform: translateX(18px); }

.advanced-fields {
    max-height: 0; overflow: hidden;
    transition: max-height 0.5s ease-out; margin-top: 0;
}
.advanced-fields.active { max-height: 200px; margin-top: 1.5rem; }

/* --- Result Container & Chart --- */
#result-container {
    margin-top: 2.5rem;
    padding: 1.5rem;
    background: var(--bg-dark);
    border-radius: 8px;
    transition: all 0.5s ease;
    opacity: 0;
    transform: translateY(20px);

    /* Grid layout for results and chart */
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}
#result-container:not(.hidden) { opacity: 1; transform: translateY(0); }
.hidden { display: none !important; }

.result-details h3 {
    color: var(--primary-accent);
    margin-bottom: 1.5rem;
    text-align: left;
}
.result-item {
    display: flex; justify-content: space-between;
    padding: 0.75rem 0; border-bottom: 1px solid var(--border-color);
}
.result-item:last-child { border-bottom: none; }
.result-item span { color: var(--text-medium); }
.result-item strong { font-size: 1.2rem; }
.result-item.total strong {
    color: var(--primary-accent); font-size: 1.5rem; font-weight: 700;
}
.result-item.inflation-adjusted { border-top: 2px dashed var(--border-color); margin-top: 1rem; padding-top: 1rem; }
.result-item.inflation-adjusted.hidden { display: none; }
.result-item.inflation-adjusted strong { color: var(--success-color); }

.chart-container {
    position: relative;
    height: 280px;
    width: 100%;
}

/* --- Other Sections --- */
#how-it-works { padding: 6rem 0; }
#how-it-works article {
    max-width: 800px; margin: 2rem auto 0 auto; background: var(--bg-light);
    padding: 2rem; border-radius: 10px; border: 1px solid var(--border-color);
}
#how-it-works p, #how-it-works ul { margin-bottom: 1rem; color: var(--text-medium); }
#how-it-works ul { list-style-position: inside; padding-left: 1rem; }
#how-it-works li { margin-bottom: 0.5rem; }
.formula-box {
    background: var(--bg-dark); padding: 1.5rem; border-radius: 8px;
    text-align: center; margin: 1.5rem 0; border: 1px dashed var(--primary-accent);
}
.formula-box code { font-size: 1.2rem; color: var(--text-light); }

#other-calculators { padding: 6rem 0; background-color: var(--bg-light); }
.calculator-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem; margin-top: 3rem;
}
.calculator-card {
    background: var(--bg-dark); padding: 2rem; border-radius: 10px;
    border: 1px solid var(--border-color); transition: all 0.3s ease;
    color: var(--text-light);
}
.calculator-card:hover {
    transform: translateY(-10px); border-color: var(--primary-accent);
    box-shadow: 0 10px 20px rgba(0, 245, 195, 0.1);
}
.calculator-card i { font-size: 2.5rem; color: var(--primary-accent); margin-bottom: 1rem; }
.calculator-card h3 { color: var(--text-light); margin-bottom: 0.5rem; }
.calculator-card p { color: var(--text-medium); font-size: 0.9rem; }

/* --- Footer --- */
footer {
    background: var(--bg-dark); padding: 4rem 0 2rem 0;
    border-top: 1px solid var(--border-color);
}
.footer-content {
    display: grid; grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem; margin-bottom: 3rem;
}
.footer-about p { color: var(--text-medium); margin-top: 1rem; max-width: 350px; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a, .footer-social a { color: var(--text-medium); }
.footer-links a:hover, .footer-social a:hover { color: var(--primary-accent); }
.footer-social a { font-size: 1.5rem; margin-right: 1rem; }
.footer-bottom {
    text-align: center; padding-top: 2rem; border-top: 1px solid var(--border-color);
    color: var(--text-medium); font-size: 0.9rem;
}

/* --- Responsiveness --- */
@media (max-width: 992px) {
  #menu-toggle {

        display: block; /* Show hamburger on tablets and mobile */

    }

    nav {

        justify-content: space-between; /* Make space for the hamburger */

    }
    .form-grid { grid-template-columns: 1fr; }
    #result-container { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .footer-about p { margin: 1rem auto; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    #hero { min-height: auto; padding: 120px 0 60px 0; }
    .calculator-wrapper { padding: 1.5rem; }
    #how-it-works, #other-calculators { padding: 4rem 0; }
    .chart-container { height: 250px; } /* Adjust chart height for mobile */
}