/* ============================================
   Excavation Calculator — Tool-specific styles
   ============================================ */
.calc-tabs{display:flex;gap:0;border-bottom:1px solid var(--color-border);margin-bottom:24px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.calc-tabs::-webkit-scrollbar{display:none}
.calc-tab{padding:12px 16px;cursor:pointer;font-family:var(--font-body);font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--color-muted);border:none;background:none;border-bottom:2px solid transparent;white-space:nowrap;transition:color .2s,border-color .2s;min-height:44px}
.calc-tab:hover{color:var(--color-text)}
.calc-tab.active{color:var(--color-text);border-bottom-color:var(--color-primary)}
.tab-panel{display:none}.tab-panel.active{display:block;padding-top:20px}
.unit-toggle{display:flex;gap:8px;margin-bottom:24px}
.unit-pill{padding:8px 18px;border-radius:20px;border:1px solid var(--color-border);background:var(--color-surface2);color:var(--color-muted);cursor:pointer;font-size:12px;font-family:var(--font-mono);letter-spacing:1px;text-transform:uppercase;min-height:36px;transition:all .2s}
.unit-pill.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}
.wastage-group{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.wastage-btn{padding:8px 16px;border-radius:6px;border:1px solid var(--color-border);background:var(--color-surface2);color:var(--color-muted);cursor:pointer;font-family:var(--font-mono);font-size:11px;letter-spacing:1px;min-height:36px;transition:all .2s}
.wastage-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}

/* ── Soil Type Grid ── */
.soil-type-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px}
.soil-card{background:var(--color-surface2);border:1px solid var(--color-border);border-radius:8px;padding:12px;cursor:pointer;text-align:center;transition:border-color .2s,background .2s}
.soil-card:hover{border-color:var(--color-border-hover)}
.soil-card.active{border-color:var(--color-primary);background:rgba(244,100,10,0.08)}
.soil-card-name{font-size:13px;font-weight:600;color:var(--color-text);margin-bottom:4px}
.soil-card-swell{font-family:var(--font-mono);font-size:10px;color:var(--color-muted);letter-spacing:.5px}

/* ── Results ── */
.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px}
.result-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;padding:18px 20px}
.result-card.primary{grid-column:1/-1}
.result-card.highlight{border-left:3px solid var(--color-primary)}
.result-card.yellow{border-left:3px solid var(--color-yellow)}
.result-num{font-family:var(--font-mono);font-size:30px;font-weight:600;color:var(--color-yellow);line-height:1}
.result-lbl{font-family:var(--font-mono);font-size:10px;text-transform:uppercase;letter-spacing:2px;color:var(--color-muted);margin-bottom:6px}
.result-sub{font-size:12px;color:var(--color-muted);margin-top:4px}
.result-actions{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.result-actions h3{font-family:var(--font-heading);font-size:22px;letter-spacing:1px;margin:0}
.result-actions-btns{display:flex;gap:8px}
.results-note{font-size:12px;color:var(--color-muted);margin-top:20px;padding-top:16px;border-top:1px solid var(--color-border);line-height:1.7}
.trust-chips{display:flex;gap:16px;flex-wrap:wrap;margin-top:20px}
.field-error-msg{display:none;font-size:11px;color:var(--color-primary);margin-top:4px}
.field-error-msg.visible{display:block}

/* ── How-To Steps ── */
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:28px}
.step-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;padding:28px 20px;text-align:center}
.step-num{font-family:var(--font-heading);font-size:48px;color:var(--color-primary);opacity:.35;line-height:1;margin-bottom:12px}
.step-title{font-size:15px;font-weight:600;color:var(--color-text);margin-bottom:8px}
.step-desc{font-size:13px;color:var(--color-muted);line-height:1.6}

/* ── Article ── */
.prose table{width:100%;border-collapse:collapse;margin:20px 0 28px;font-size:14px}
.prose th,.prose td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--color-border)}
.prose th{font-family:var(--font-mono);font-size:10px;letter-spacing:2px;text-transform:uppercase;color:var(--color-muted);background:var(--color-surface)}
.prose td{color:var(--color-text)}

/* ── FAQ ── */
.faq-list{max-width:800px;margin-top:20px}
.faq-item{border-bottom:1px solid var(--color-border)}
.faq-question{display:flex;justify-content:space-between;align-items:center;padding:16px 0;cursor:pointer;font-weight:600;color:var(--color-text);font-size:15px;font-family:var(--font-body);background:none;border:none;width:100%;text-align:left;transition:color .2s}
.faq-question.open,.faq-question:hover{color:var(--color-primary)}
.faq-arrow{flex-shrink:0;margin-left:12px;color:var(--color-muted);font-size:14px}
.faq-answer{display:none;padding:0 0 16px;font-size:14px;color:var(--color-muted);line-height:1.8}
.faq-answer.open{display:block}

/* ── Related ── */
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}

/* ── Ads ── */
.ad-placeholder{background:var(--color-surface2);border:2px dashed var(--color-border);border-radius:6px;display:block;margin:28px auto}
.ad-leaderboard{width:728px;height:90px;max-width:100%}
.ad-rectangle{width:300px;height:250px}

/* ── Responsive ── */
@media(max-width:768px){.result-grid{grid-template-columns:1fr}.steps-grid{grid-template-columns:repeat(2,1fr)}.related-grid{grid-template-columns:1fr}.ad-rectangle{float:none;margin:28px auto}}
@media(max-width:600px){.soil-type-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.ad-leaderboard{width:320px;height:50px}.steps-grid{grid-template-columns:1fr}.form-row{grid-template-columns:1fr}}
@media print{.navbar,#footer,.ad-placeholder,.calc-tabs,.unit-toggle,.calculator-wrap,.wastage-group,.faq-item,section:not(.results-section),.btn{display:none!important}.result-box{display:block!important;border:1px solid #ccc}}