:root {
    --primary-green: #2ecc71;
    --dark-green: #27ae60;
    --light-green: rgba(46, 204, 113, 0.1);
    --text-dark: #f4f7f6;
    --text-light: #a0aec0;
    --background: #1a202c;
    --card-bg: #2d3748;
    --input-bg: #1a202c;
    --white: #ffffff;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --border-radius: 12px;
    --border-color: #4a5568;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px; /* Wider for the big chart */
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--card-bg);
    padding: 15px 0;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

@media (min-width: 768px) {
    header {
        padding: 20px 0;
        margin-bottom: 40px;
    }
    header .container {
        flex-direction: row;
        justify-content: space-between;
    }
}

.logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.logo .accent {
    color: var(--primary-green);
}

/* Motto Banner */
.motto-banner {
    text-align: center;
    padding: 10px 0;
    background: rgba(46, 204, 113, 0.05);
    border-bottom: 1px solid var(--border-color);
    margin-top: -30px;
    margin-bottom: 30px;
}

.motto-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.motto-text span {
    color: var(--primary-green);
}

/* Purpose Section */
.purpose-section {
    margin-top: 60px;
    margin-bottom: 60px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    .purpose-section {
        grid-template-columns: 1fr 1fr;
    }
}

.purpose-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}

.purpose-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-green);
}

.purpose-card h3 {
    color: var(--primary-green);
    font-size: 18px;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.purpose-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.7;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 5px;
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    nav {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 5px;
        -webkit-overflow-scrolling: touch;
    }
    nav ul {
        width: max-content;
        gap: 5px;
        padding: 0 5px;
    }
}

nav ul li a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 600;
    font-size: 13px;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.3s;
    white-space: nowrap;
}

@media (min-width: 768px) {
    nav ul li a {
        font-size: 15px;
        margin-left: 5px;
    }
}

nav ul li a.active, nav ul li a:hover {
    color: var(--white);
    background-color: rgba(46, 204, 113, 0.2);
}

/* Calculator Card */
.calculator-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

@media (min-width: 768px) {
    .calculator-card {
        padding: 40px;
    }
}

.calculator-header {
    margin-bottom: 25px;
    text-align: center;
}

.calculator-header h2 {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--white);
}

@media (min-width: 768px) {
    .calculator-header h2 {
        font-size: 28px;
    }
}

.calculator-header p {
    color: var(--text-light);
    font-size: 14px;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 992px) {
    .calculator-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    .buy-rent-grid {
        grid-template-columns: 350px 1fr; /* 1/3 vs 2/3 roughly */
    }
}

/* Inputs */
.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-light);
}

.input-helper {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary-green);
    margin-top: 6px;
    min-height: 15px; /* Critical for grid alignment */
}

.input-group input, .input-group select {
    width: 100%;
    padding: 12px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    color: var(--white);
    transition: border-color 0.3s, box-shadow 0.3s;
    -webkit-appearance: none;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
}

.primary-btn {
    width: 100%;
    padding: 16px;
    background-color: var(--primary-green);
    color: #1a202c;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.3s;
    margin-top: 10px;
    touch-action: manipulation;
}

.primary-btn:hover {
    background-color: var(--dark-green);
    transform: translateY(-1px);
}

/* Results */
.results {
    background-color: var(--input-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .results {
        padding: 30px;
    }
}

.result-item {
    text-align: center;
    margin-bottom: 15px;
}

.result-item.main-result {
    margin-bottom: 25px;
}

.result-item .label {
    display: block;
    color: var(--text-light);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.result-item .value {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
}

.money-text {
    font-size: 32px !important;
    color: var(--primary-green) !important;
}

@media (min-width: 768px) {
    .money-text {
        font-size: 42px !important;
    }
}

.result-details {
    display: grid;
    grid-template-columns: 1fr;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    gap: 15px;
}

@media (min-width: 480px) {
    .result-details {
        grid-template-columns: 1fr 1fr;
    }
}

.hidden {
    display: none !important;
}

.buy-rent-grid .inputs {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.dense-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 25px;
}

@media (max-width: 480px) {
    .dense-input-grid {
        grid-template-columns: 1fr;
    }
}

.input-group.full-width {
    grid-column: 1 / -1;
}

.input-section-title {
    color: var(--primary-green);
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 15px;
    margin-top: 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
}

.input-section-title:first-child {
    margin-top: 0;
}

.winner-box {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--primary-green);
    text-align: center;
    font-weight: 700;
    font-size: 16px;
    color: var(--white);
    margin-top: 10px;
}

.comparison-summary {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.chart-box {
    height: 400px;
    width: 100%;
}

/* Simulation Breakdown */
.simulation-breakdown {
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
}

.breakdown-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.breakdown-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 600px) {
    .breakdown-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.breakdown-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.breakdown-item h4 {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 10px;
    text-transform: uppercase;
}

.breakdown-row {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    margin-bottom: 5px;
}

.breakdown-row:last-child {
    margin-bottom: 0;
    padding-top: 5px;
    border-top: 1px dashed var(--border-color);
    font-weight: 700;
}

.breakdown-row .label {
    color: var(--text-light);
    font-weight: 400;
}

.breakdown-row .val {
    color: var(--white);
}

.breakdown-row .val.highlight {
    color: var(--primary-green);
}

/* Footer */
footer {
    padding: 40px 0;
    background-color: #121821;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom {
    font-size: 13px;
    padding: 0 20px;
}

.footer-bottom a:hover {
    text-decoration: underline !important;
}

/* Tooltips */
.tooltip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background: var(--light-green);
    color: var(--primary-green);
    border-radius: 50%;
    font-size: 10px;
    font-weight: bold;
    cursor: help;
    margin-left: 5px;
    position: relative;
    vertical-align: middle;
}

.tooltip-icon::after {
    content: attr(data-tip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    color: var(--white);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 12px;
    width: 200px;
    text-align: center;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    z-index: 100;
}

.tooltip-icon:hover::after {
    visibility: visible;
    opacity: 1;
}

.disclaimer-text {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
    text-align: center;
    margin: 10px 0;
    display: block;
    line-height: 1.4;
    opacity: 0.8;
}

.disclaimer-highlight {
    color: var(--primary-green);
    font-weight: 600;
}