@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

:root {
    --bg-color: #1A202C;
    --card-color: #2D3748;
    --primary-accent: #00BFA5; /* RGSciences Green/Teal */
    --text-primary: #E2E8F0;
    --text-secondary: #A0AEC0;
    --border-color: #4A5568;
    --glow-shadow: 0 0 15px rgba(0, 191, 165, 0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.7;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--card-color);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
}

header nav a {
    color: var(--primary-accent);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

header nav a:hover {
    background-color: rgba(0, 191, 165, 0.1);
}

main.article-flow > section {
    background-color: var(--card-color);
    margin-bottom: 2.5rem;
    padding: 2.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.intro {
    background: none;
    border: none;
    text-align: center;
    padding-top: 1rem;
    padding-bottom: 0;
}

h1 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: 2.5rem;
}
h2 {
    color: #fff;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary-accent);
    padding-bottom: 0.75rem;
    font-size: 1.8rem;
}
p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    max-width: 75ch;
}
.subtitle {
    font-size: 1.2rem;
    max-width: 65ch;
    margin-left: auto;
    margin-right: auto;
}

#pedEstimator {
    padding-top: 1.5rem;
}
.slider-group {
    margin-bottom: 1.5rem;
}
.slider-group label {
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
}
.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--bg-color);
    border-radius: 5px;
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-accent);
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--card-color);
}
input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-accent);
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--card-color);
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}
.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}
.input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

button, .cta-button {
    display: block;
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    text-decoration: none;
    margin-top: 1.5rem;
}
#calculateBtn {
    background-color: var(--primary-accent);
    color: #000;
    box-shadow: var(--glow-shadow);
}
#calculateBtn:hover {
    filter: brightness(1.1);
    box-shadow: 0 0 20px rgba(0, 191, 165, 0.4);
}

#estimatePedBtn {
    background-color: transparent;
    border: 2px solid var(--primary-accent);
    color: var(--primary-accent);
}
#estimatePedBtn:hover {
    background-color: var(--primary-accent);
    color: #000;
}

.hidden { display: none; }

.results-card strong { color: var(--primary-accent); }

/* Chart Container styling to control height */
.chart-container {
    position: relative;
    height: 400px;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.scenario-comparison {
    margin-top: 2.5rem;
}
h3 {
    margin-bottom: 1rem;
    color: #fff;
    font-size: 1.4rem;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
th {
    background-color: rgba(0,0,0,0.2);
    font-weight: 600;
    color: var(--text-secondary);
}
.optimal-row { background-color: rgba(0, 191, 165, 0.05); }
.optimal-row > td:first-child {
    font-weight: 600;
    color: var(--primary-accent);
}

.cta-card {
    background: linear-gradient(135deg, #0A2540, #1A202C);
    text-align: center;
}
.cta-button {
    background-color: var(--primary-accent);
    color: #000;
    display: inline-block;
    width: auto;
    padding: 0.75rem 2rem;
}
.cta-button:hover { filter: brightness(1.1); }

footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}