/* ═══════════════════════════════════════════════════════════════
   WireRight — The Cable Gauge & Voltage Drop Calculator
   Bespoke: Electrical copper on dark carbon
   ═══════════════════════════════════════════════════════════════ */
:root {
    --bg-primary: #0c0a08;
    --bg-surface: #1a1614;
    --bg-hover: #252018;
    --bg-input: #151210;
    --text-primary: #f0ece4;
    --text-secondary: #bfb5a0;
    --text-muted: #7a7060;
    --accent: #d97706;
    --accent-hover: #b45309;
    --accent-glow: rgba(217, 119, 6, 0.15);
    --accent-glow-strong: rgba(217, 119, 6, 0.3);
    --border: rgba(191, 181, 160, 0.1);
    --border-hover: rgba(217, 119, 6, 0.4);
    --success: #22c55e; --success-bg: rgba(34, 197, 94, 0.12);
    --warning: #f59e0b; --warning-bg: rgba(245, 158, 11, 0.12);
    --error: #ef4444; --error-bg: rgba(239, 68, 68, 0.12);
    --radius: 12px; --radius-sm: 8px;
    --shadow: 0 2px 12px rgba(0,0,0,0.4);
    --transition: 0.2s ease;
}
[data-theme="light"] { --bg-primary:#faf8f5; --bg-surface:#fff; --bg-hover:#f0ece4; --bg-input:#f5f2ec; --text-primary:#1a1814; --text-secondary:#4a4538; --text-muted:#7a7468; --border:rgba(26,24,20,0.1); --shadow:0 2px 12px rgba(0,0,0,0.08); }
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-secondary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}
.container{max-width:1100px;margin:0 auto;padding:0 1rem}
.site-header{background:linear-gradient(135deg,#1a1510 0%,#0c0a08 100%);border-bottom:1px solid var(--border);padding:2rem 0 1.5rem;text-align:center}
.header-inner{display:flex;flex-direction:column;align-items:center;gap:0.25rem}
.brand{display:flex;align-items:center;gap:0.75rem}.brand-icon{font-size:2rem}
.brand-name{font-family:'Outfit',sans-serif;font-weight:800;font-size:clamp(1.8rem,5vw,2.5rem);color:var(--text-primary);letter-spacing:-0.02em}
.brand-tagline{font-family:'Outfit',sans-serif;font-weight:600;font-size:1rem;color:var(--accent);margin-top:0.25rem}
.brand-subtitle{font-size:0.9rem;color:var(--text-muted);max-width:520px;margin-top:0.25rem}
.privacy-badge{display:inline-flex;align-items:center;gap:0.5rem;background:var(--accent-glow);border:1px solid rgba(217,119,6,0.2);border-radius:999px;padding:0.4rem 1rem;font-size:0.8rem;font-weight:500;color:var(--accent);margin:1.5rem auto 1rem;text-align:center;width:fit-content}
.app-grid{display:grid;grid-template-columns:1fr;gap:1.5rem;margin-top:1rem}
@media(min-width:768px){.app-grid{grid-template-columns:400px 1fr}}
.panel{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow)}
.panel-title{font-family:'Outfit',sans-serif;font-weight:700;font-size:1.35rem;color:var(--text-primary);margin-bottom:1.25rem}
.input-group{margin-bottom:1.25rem}.input-group--half{flex:1;min-width:0}
.input-row{display:flex;gap:1rem;margin-bottom:1.25rem}
label{display:block;font-size:0.85rem;font-weight:600;color:var(--text-primary);margin-bottom:0.4rem}
input[type="number"],select{width:100%;padding:0.65rem 0.85rem;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-family:'JetBrains Mono',monospace;font-size:0.95rem;transition:border-color var(--transition),box-shadow var(--transition);appearance:none}
select{font-family:'Inter',sans-serif;font-size:0.85rem;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237a7060' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 0.75rem center;padding-right:2rem}
input:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.input-hint{display:block;font-size:0.75rem;color:var(--text-muted);margin-top:0.3rem}
.preset-row{display:flex;gap:0.5rem;margin-bottom:0.5rem;flex-wrap:wrap}
.btn-preset{padding:0.4rem 0.75rem;font-size:0.8rem;font-weight:600;background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);font-family:'JetBrains Mono',monospace}
.btn-preset:hover{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.btn-preset.active{background:var(--accent-glow-strong);border-color:var(--accent);color:var(--accent)}
.btn-calculate{width:100%;padding:0.85rem;font-size:1rem;font-weight:700;background:linear-gradient(135deg,var(--accent),var(--accent-hover));border:none;border-radius:var(--radius-sm);color:#1a1200;cursor:pointer;transition:all var(--transition);font-family:'Inter',sans-serif;margin-top:0.5rem}
.btn-calculate:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(217,119,6,0.35)}
.error-message{background:var(--error-bg);border:1px solid rgba(239,68,68,0.3);border-radius:var(--radius-sm);padding:0.75rem 1rem;font-size:0.85rem;color:var(--error);margin-bottom:1rem}
.hidden{display:none !important}

/* ── Gauge Hero ── */
.recommended-gauge{text-align:center;padding:1.5rem;background:var(--accent-glow);border:1px solid rgba(217,119,6,0.25);border-radius:var(--radius);margin-bottom:1.25rem}
.gauge-hero{display:flex;align-items:baseline;justify-content:center;gap:0.5rem}
.gauge-number{font-family:'JetBrains Mono',monospace;font-size:3.5rem;font-weight:700;color:var(--accent);line-height:1}
.gauge-label{font-family:'Outfit',sans-serif;font-size:1.5rem;font-weight:700;color:var(--text-muted)}
.gauge-desc{display:block;font-size:0.82rem;color:var(--text-muted);margin-top:0.25rem}

.summary-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0.75rem;margin-bottom:1.25rem}
@media(min-width:600px){.summary-grid{grid-template-columns:repeat(4,1fr)}}
.summary-card{background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0.85rem 0.75rem;text-align:center;transition:border-color var(--transition)}
.summary-card:hover{border-color:var(--border-hover)}
.summary-label{display:block;font-size:0.7rem;font-weight:600;text-transform:uppercase;letter-spacing:0.06em;color:var(--text-muted);margin-bottom:0.35rem}
.summary-value{display:block;font-family:'JetBrains Mono',monospace;font-size:1.1rem;font-weight:500;color:var(--text-primary)}

/* ── Voltage Drop Bar ── */
.section-subtitle{font-family:'Outfit',sans-serif;font-weight:700;font-size:1.1rem;color:var(--text-primary);margin-bottom:0.75rem}
.vdrop-bar{position:relative;height:24px;background:var(--bg-input);border:1px solid var(--border);border-radius:12px;overflow:hidden;margin-bottom:0.25rem}
.vdrop-fill{height:100%;border-radius:12px;transition:width 0.5s ease;background:linear-gradient(90deg,var(--success),var(--warning),var(--error))}
.vdrop-threshold{position:absolute;top:0;height:100%;width:2px;background:var(--text-primary);opacity:0.6}
.vdrop-labels{display:flex;justify-content:space-between;font-size:0.72rem;color:var(--text-muted);font-family:'JetBrains Mono',monospace}

/* ── Gauge Table ── */
.gauge-table-wrap{overflow-x:auto;margin-bottom:1.25rem}
.gauge-table{width:100%;border-collapse:collapse;font-size:0.82rem}
.gauge-table th{text-align:left;padding:0.5rem 0.6rem;font-weight:600;color:var(--text-muted);border-bottom:1px solid var(--border);font-size:0.72rem;text-transform:uppercase;letter-spacing:0.05em}
.gauge-table td{padding:0.5rem 0.6rem;border-bottom:1px solid var(--border);color:var(--text-secondary);font-family:'JetBrains Mono',monospace;font-size:0.8rem}
.gauge-table tr.recommended{background:var(--accent-glow);border-left:3px solid var(--accent)}
.gauge-table tr.too-small{opacity:0.5}
.gauge-badge{font-size:0.65rem;padding:0.15rem 0.4rem;border-radius:999px;font-weight:700;display:inline-block}
.gauge-badge--ok{background:var(--success-bg);color:var(--success)}
.gauge-badge--fail{background:var(--error-bg);color:var(--error)}
.gauge-badge--rec{background:var(--accent-glow-strong);color:var(--accent)}

.export-row{display:flex;gap:0.75rem;margin-bottom:1.25rem}
.btn-export{display:inline-flex;align-items:center;gap:0.4rem;padding:0.5rem 1rem;font-size:0.8rem;font-weight:600;background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition)}
.btn-export:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}

.how-it-works{margin-top:2.5rem;padding:2rem 0}.how-title{text-align:center;margin-bottom:1.5rem}
.how-grid{display:grid;grid-template-columns:1fr;gap:1rem}
@media(min-width:600px){.how-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:900px){.how-grid{grid-template-columns:repeat(4,1fr)}}
.how-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;text-align:center;transition:border-color var(--transition),transform var(--transition)}
.how-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}
.how-icon{font-size:1.8rem;display:block;margin-bottom:0.75rem}
.how-card-title{font-family:'Outfit',sans-serif;font-weight:700;font-size:1rem;color:var(--text-primary);margin-bottom:0.5rem}
.how-card p{font-size:0.82rem;color:var(--text-muted);line-height:1.5}

.seo-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-top:1.5rem}
.seo-card h2{font-family:'Outfit',sans-serif;font-weight:700;font-size:1.25rem;color:var(--text-primary);margin-bottom:0.75rem}
.seo-card p{font-size:0.9rem;color:var(--text-secondary);line-height:1.7}.seo-card strong{color:var(--text-primary)}

.site-footer{text-align:center;padding:2rem 0;margin-top:2rem;border-top:1px solid var(--border)}
.footer-privacy{font-size:0.82rem;font-weight:500;color:var(--accent);margin-bottom:0.4rem}
.footer-disclaimer,.footer-copyright{font-size:0.75rem;color:var(--text-muted);margin-bottom:0.4rem}
.footer-copyright strong{color:var(--text-secondary)}

.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%) translateY(100px);background:var(--bg-surface);border:1px solid var(--accent);border-radius:var(--radius-sm);padding:0.7rem 1.4rem;font-size:0.85rem;font-weight:500;color:var(--accent);box-shadow:0 8px 32px rgba(0,0,0,0.4);opacity:0;transition:all 0.3s ease;z-index:1000;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media(max-width:480px){.input-row{flex-direction:column;gap:0}}