:root {
    --ink: #17202a;
    --paper: #ffffff;
    --navy: #1e3a8a;
    --cyan: #06b6d4;
    --border: #e2e8f0;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--paper);
    color: var(--ink);
    margin: 0;
    line-height: 1.6;
    padding-bottom: 3rem;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    padding: 0 1rem;
}

header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
    text-align: center;
}

h1 { color: var(--navy); font-size: 1.5rem; margin:0 0 0.25rem 0; }
.subtitle { margin:0; color:#64748b; font-size:0.9rem; text-transform:uppercase; }

.card {
    background: #fff;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.5rem;
}

label {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

input {
    padding: 1rem;
    font-size: 1.2rem;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.btn {
    width: 100%;
    padding: 1rem;
    border-radius: 6px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
}

.btn-primary { background: var(--navy); color: #fff; }

.hidden { display: none !important; }

.results {
    background: #fff;
    border: 1px solid var(--border);
    border-top: 4px solid var(--cyan);
    padding: 1.5rem;
    border-radius: 8px;
}

.results h2 { margin-top: 0; font-size: 1.25rem; }

.metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric {
    background: var(--paper);
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
    border: 1px solid var(--border);
}

.label { display: block; font-size: 0.8rem; color: #64748b; text-transform: uppercase; margin-bottom: 0.25rem;}
.value { font-size: 1.25rem; font-weight: bold; color: var(--navy); }

.context-box {
    background: rgba(30,58,138,0.05);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.tips-list {
    padding-left: 1.25rem;
}
.tips-list li { margin-bottom: 0.5rem; font-size: 0.9rem; }

/* --- CSS DE REFERÊNCIAS --- */
.references { margin-top: 2rem; padding: 1.5rem; background: rgba(15,23,42,0.05); border-radius: 8px; font-size: 0.9rem; text-align: left; }
.references h3 { margin-top: 0; font-size: 1rem; color: var(--text-primary, #17202a); margin-bottom: 0.5rem; }
.references p { margin-bottom: 1rem; color: var(--text-secondary, #475569); }
.references ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.references li { margin-bottom: 0.5rem; color: var(--text-secondary, #475569); }
.references a { color: #0ea5e9; text-decoration: none; font-weight: bold; }
.references .disclaimer { margin-top: 1rem; font-style: italic; color: #64748b; font-size: 0.85rem; border-top: 1px solid rgba(0,0,0,0.1); padding-top: 0.8rem; }