@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Lora:wght@400;500&family=Space+Mono:wght@400;700&display=swap');

:root {
    --navy: #0F1F3D;
    --navy-light: #1A2F55;
    --teal: #0D9488;
    --teal-light: #CCFBF1;
    --amber: #D97706;
    --bg: #F4F6FB;
    --bg2: #EEF1F9;
    --white: #FFFFFF;
    --text: #1E2A3A;
    --text2: #4A5568;
    --text3: #718096;
    --border: #D8DEE9;
    --red: #DC2626;
    --red-bg: #FEE2E2;
    --serif: 'Playfair Display', Georgia, serif;
    --body: 'Lora', Georgia, serif;
    --mono: 'Space Mono', monospace;
}

/* ── PAGE WRAPPER ── */
.pfg-page { max-width: 720px; margin: 0 auto; font-family: var(--body); color: var(--text); }

/* ── CALCULATOR CARD ── */
.pfg-calc-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    margin-bottom: 28px;
    box-sizing: border-box;
}
.pfg-section-tag { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 2px; color: var(--teal); margin: 0 0 8px 0; }
.pfg-calc-title  { font-family: var(--serif); font-size: 28px; font-weight: 700; color: var(--navy); margin: 0 0 6px 0; line-height: 1.2; }
.pfg-calc-subtitle { font-family: var(--body); font-size: 14px; color: var(--text3); margin: 0 0 24px 0; }

/* ── TABS ── */
.pfg-tabs { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.pfg-tab  { border: 1px solid var(--border); border-radius: 10px; padding: 12px 18px; cursor: pointer; font-family: var(--mono); font-size: 12px; background: var(--bg); color: var(--text2); text-transform: uppercase; letter-spacing: 0.5px; transition: all .2s; }
.pfg-tab.pfg-active { background: var(--navy); color: var(--white); border-color: var(--navy); }

/* ── FIELD ── */
.pfg-field { margin-bottom: 16px; }
.pfg-label { display: block; font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 1.5px; color: var(--text2); margin-bottom: 6px; }
.pfg-select, .pfg-input {
    width: 100%; border: 1px solid var(--border); border-radius: 6px; padding: 10px 14px;
    font-family: var(--body); font-size: 14px; background: var(--bg); color: var(--text);
    box-sizing: border-box; outline: none; transition: border-color .2s;
}
.pfg-select:focus, .pfg-input:focus { border-color: var(--teal); }

/* ── INPUT GRID ── */
.pfg-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 20px; }
.pfg-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-bottom: 20px; }
@media(max-width:520px){ .pfg-grid-2,.pfg-grid-3{ grid-template-columns:1fr; } }

/* ── BUTTONS ── */
.pfg-btn-row { display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.pfg-btn-primary   { background: var(--teal); color: var(--white); font-family: var(--mono); font-size: 13px; padding: 12px 24px; border-radius: 6px; text-transform: uppercase; letter-spacing: 1px; border: none; cursor: pointer; transition: background .2s; }
.pfg-btn-primary:hover { background: #0b7a70; }
.pfg-btn-secondary { background: transparent; border: 1px solid var(--border); color: var(--text2); font-family: var(--mono); font-size: 13px; padding: 12px 24px; border-radius: 6px; text-transform: uppercase; letter-spacing: 1px; cursor: pointer; transition: all .2s; }
.pfg-btn-secondary:hover { border-color: var(--navy); color: var(--navy); }

/* ── ERROR ── */
.pfg-error { background: var(--red-bg); border: 1px solid #FECACA; border-radius: 8px; padding: 12px 16px; color: var(--red); font-family: var(--body); font-size: 14px; margin-bottom: 16px; display: none; }

/* ── RESULT BOX ── */
.pfg-result-box { background: linear-gradient(135deg, #0F1F3D, #1A2F55); border-radius: 10px; padding: 20px; color: var(--white); font-family: var(--mono); margin-bottom: 12px; display: none; }
.pfg-result-lbl  { font-size: 10px; color: #5EEAD4; text-transform: uppercase; letter-spacing: 2px; margin-bottom: 6px; }
.pfg-result-val  { font-size: 24px; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.pfg-result-formula { font-size: 12px; color: #94A3B8; }

/* ── SECONDARY RESULT CARDS ── */
.pfg-cards-row { display: grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap: 10px; margin-bottom: 12px; display: none; }
.pfg-mini-card { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; text-align: center; }
.pfg-mini-card-lbl { font-family: var(--mono); font-size: 10px; color: var(--teal); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 4px; }
.pfg-mini-card-val { font-family: var(--mono); font-size: 16px; font-weight: 700; color: var(--navy); word-break: break-all; }
.pfg-mini-card-unit { font-family: var(--mono); font-size: 10px; color: var(--text3); }

/* ── STEPS ── */
.pfg-steps { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 16px; font-size: 13.5px; color: var(--text2); font-family: var(--body); display: none; }
.pfg-steps-title { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 1.5px; color: var(--teal); margin-bottom: 12px; }
.pfg-step { padding: 6px 0; border-bottom: 1px solid var(--border); line-height: 1.7; }
.pfg-step:last-child { border-bottom: none; }

/* ── CONTENT SECTION ── */
.pfg-content { margin-bottom: 28px; }
.pfg-content h2 { font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--navy); margin: 28px 0 12px 0; }
.pfg-content h3 { font-family: var(--serif); font-size: 17px; font-weight: 600; color: var(--navy-light); margin: 20px 0 8px 0; }
.pfg-content p  { font-family: var(--body); font-size: 15px; line-height: 1.75; color: var(--text2); margin: 0 0 14px 0; }
.pfg-formula-box { background: var(--navy); border-radius: 10px; padding: 18px 22px; text-align: center; font-family: var(--mono); font-size: 20px; color: var(--white); margin: 16px 0; letter-spacing: 1px; }
.pfg-formula-sub { font-size: 12px; color: #94A3B8; margin-top: 6px; }
.pfg-var-table { width: 100%; border-collapse: collapse; margin: 16px 0; font-family: var(--body); font-size: 14px; }
.pfg-var-table th { background: var(--teal); color: var(--white); padding: 10px 12px; text-align: left; font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 1px; }
.pfg-var-table td { padding: 9px 12px; border-bottom: 1px solid var(--border); color: var(--text2); }
.pfg-var-table tr:last-child td { border-bottom: none; }
.pfg-var-table td:first-child { font-family: var(--mono); font-weight: 700; color: var(--teal); font-size: 15px; }
.pfg-info-box { background: var(--teal-light); border-left: 4px solid var(--teal); border-radius: 0 8px 8px 0; padding: 14px 18px; margin: 16px 0; }
.pfg-info-box p { color: var(--navy); margin: 0; font-size: 14px; }
.pfg-apps-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 16px 0; }
@media(max-width:480px){ .pfg-apps-grid{ grid-template-columns: 1fr; } }
.pfg-app-card { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 14px; }
.pfg-app-icon { font-size: 22px; margin-bottom: 6px; }
.pfg-app-title { font-family: var(--mono); font-size: 12px; font-weight: 700; color: var(--navy); margin-bottom: 4px; }
.pfg-app-desc  { font-size: 13px; color: var(--text3); }

/* ── FAQ ── */
.pfg-faq { margin: 16px 0; }
.pfg-faq-item { border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px; overflow: hidden; }
.pfg-faq-q { font-family: var(--body); font-size: 15px; font-weight: 500; color: var(--navy); padding: 14px 18px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; background: var(--white); }
.pfg-faq-q:hover { background: var(--bg); }
.pfg-faq-q::after { content: '+'; font-family: var(--mono); font-size: 18px; color: var(--teal); flex-shrink: 0; }
.pfg-faq-item.open .pfg-faq-q::after { content: '−'; }
.pfg-faq-a { font-family: var(--body); font-size: 14px; color: var(--text2); padding: 0 18px; max-height: 0; overflow: hidden; transition: max-height .3s, padding .3s; line-height: 1.7; }
.pfg-faq-item.open .pfg-faq-a { max-height: 300px; padding: 0 18px 14px 18px; }

/* ── RELATED CALCULATORS ── */
.pfg-related { background: var(--bg2); border: 1px solid var(--border); border-radius: 12px; padding: 22px; }
.pfg-related-title { font-family: var(--serif); font-size: 20px; font-weight: 700; color: var(--navy); margin: 0 0 16px 0; }
.pfg-related-grid  { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media(max-width:480px){ .pfg-related-grid{ grid-template-columns: 1fr; } }
.pfg-related-card  { background: var(--white); border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; text-decoration: none; display: block; transition: border-color .2s, box-shadow .2s; }
.pfg-related-card:hover { border-color: var(--teal); box-shadow: 0 2px 8px rgba(13,148,136,.15); }
.pfg-related-card-tag { font-family: var(--mono); font-size: 10px; color: var(--teal); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.pfg-related-card-name { font-family: var(--body); font-size: 15px; font-weight: 500; color: var(--navy); margin-bottom: 3px; }
.pfg-related-card-desc { font-family: var(--mono); font-size: 11px; color: var(--text3); }