:root {
    --ink: #1a1a1a;
    --ink-light: #4a4a4a;
    --paper: #f9f7f1; /* Warm ivory background */
    --paper-dark: #e8e5d9;
    --sage: #4e6e5d; /* Elegant green for success/buttons */
    --clay: #a65d57; /* Muted red for errors/failures */
    --amber: #d4a373;
    --line: rgba(0, 0, 0, 0.1);
    
    --font-display: 'Fraunces', serif;
    --font-body: 'Source Sans 3', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

body {
    background-color: var(--paper-dark);
    color: var(--ink);
    font-family: var(--font-body);
    margin: 0;
    padding: 2rem;
    display: flex;
    justify-content: center;
}

.ledger-container {
    background-color: var(--paper);
    max-width: 800px;
    width: 100%;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border: 1px solid var(--line);
    /* The faint horizontal ledger lines */
    background-image: repeating-linear-gradient(transparent, transparent 31px, var(--line) 31px, var(--line) 32px);
    background-attachment: local;
}

.ledger-header {
    text-align: center;
    border-bottom: 2px solid var(--ink);
    padding-bottom: 1rem;
    margin-bottom: 2rem;
    background-color: var(--paper); /* Hides lines behind header */
}

h1, h2, h3 {
    font-family: var(--font-display);
    margin: 0;
}

h1 { font-size: 2.2rem; }
.subtitle { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 2px; color: var(--ink-light); }

h2 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--sage);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-row {
    display: flex;
    flex-direction: column;
}

.input-row label {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

input[type="number"], select {
    font-family: var(--font-mono);
    padding: 0.5rem;
    border: 1px solid var(--ink-light);
    background-color: transparent;
    font-size: 1rem;
}

input[type="number"]:focus, select:focus {
    outline: 2px solid var(--sage);
}

.aggregate-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-top: 2px dashed var(--line);
    font-weight: 600;
    font-size: 1.2rem;
}

.mono-display {
    font-family: var(--font-mono);
    color: var(--sage);
    font-size: 1.5rem;
}

button {
    width: 100%;
    padding: 1rem;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s;
}

.btn-primary { background-color: var(--sage); color: white; }
.btn-primary:hover { background-color: #3b5346; }
.btn-secondary { background-color: transparent; border: 1px solid var(--ink); color: var(--ink); margin-top: 1rem;}
.btn-secondary:hover { background-color: var(--line); }

.hidden { display: none !important; }
.error-text { color: var(--clay); margin-top: 1rem; font-weight: 600; text-align: center; }

/* Result Card Styles */
.result-card {
    padding: 2rem;
    border: 1px solid var(--line);
    background: white;
    text-align: center;
}

.status-passed { border-top: 5px solid var(--sage); }
.status-failed { border-top: 5px solid var(--clay); }

.pathway-code {
    font-size: 4rem;
    font-family: var(--font-display);
    color: var(--sage);
    margin: 0.5rem 0;
}

.confidence-bar-bg { width: 100%; height: 8px; background-color: var(--line); margin-top: 0.5rem; }
.confidence-bar-fill { height: 100%; background-color: var(--sage); }

/* Footer Metrics */
.ledger-footer { margin-top: 3rem; text-align: center; font-size: 0.85rem; color: var(--ink-light); }
details { cursor: pointer; }
.metrics-panel { margin-top: 1rem; text-align: left; background: white; padding: 1rem; border: 1px solid var(--line); font-family: var(--font-mono); }