/* ═══════════════════════════════════════════════════════════════
   EA Residencial PRO — Public Styles v1.1.3
   Architecture matches ea-grounding-calc / nec-hvac-calc:
   - #nrc-calculator-root  = transparent 100%-wide host (with side padding)
   - .nrc-calc             = inner styled box, max-width 960px, centered
   ═══════════════════════════════════════════════════════════════ */

:root,
.nrc-theme-light {
    --nrc-bg: #ffffff;
    --nrc-card: #f8fafc;
    --nrc-input-bg: #ffffff;
    --nrc-hover: #e2e8f0;
    --nrc-accent: #f59e0b;
    --nrc-accent-dk: #d97706;
    --nrc-accent-bg: rgba(245,158,11,.08);
    --nrc-text: #1e293b;
    --nrc-text2: #475569;
    --nrc-muted: #94a3b8;
    --nrc-border: #e2e8f0;
    --nrc-green: #10b981;
    --nrc-green-dk: #047857;
    --nrc-red: #ef4444;
    --nrc-blue: #2563eb;
    --nrc-header-bg: linear-gradient(135deg, #0d1f3c, #152a4a);
    --nrc-results-header-bg: linear-gradient(135deg, #065f46, #047857);
    --nrc-shadow: 0 1px 3px rgba(0,0,0,.08);
}

.nrc-theme-dark {
    --nrc-bg: #0a1628;
    --nrc-card: #111d35;
    --nrc-input-bg: #1a2744;
    --nrc-hover: #1d2d50;
    --nrc-accent-bg: rgba(245,158,11,.1);
    --nrc-text: #e2e8f0;
    --nrc-text2: #94a3b8;
    --nrc-muted: #64748b;
    --nrc-border: #1e3154;
    --nrc-blue: #3b82f6;
    --nrc-shadow: 0 1px 3px rgba(0,0,0,.2);
}

/* ─── Outer host: transparent, full-width, with breathing-room padding ─── */
#nrc-calculator-root {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 24px 24px 30px;
    background: transparent;
}

/* ─── Inner box: styled, centered, max 960px ─── */
.nrc-calc, .nrc-calc * { box-sizing: border-box; margin: 0; padding: 0; }
.nrc-calc {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--nrc-text);
    background: var(--nrc-bg);
    border-radius: 16px;
    border: 1px solid var(--nrc-border);
    overflow: hidden;
    max-width: 960px;
    margin: 0 auto;
    box-shadow: 0 4px 16px rgba(0,0,0,.04);
}

/* ─── Header ─── */
.nrc-header { background: var(--nrc-header-bg); padding: 16px 20px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.nrc-header-left { display: flex; align-items: center; gap: 10px; }
.nrc-header-icon { font-size: 28px; }
.nrc-header-title { font-size: 17px; font-weight: 700; color: #ffffff !important; margin: 0 !important; line-height: 1.2; }
.nrc-header-subtitle { font-size: 11px; color: rgba(255,255,255,.7); }
.nrc-header-actions { display: flex; gap: 4px; flex-wrap: wrap; }
.nrc-hbtn { background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.15); color: rgba(255,255,255,.7); padding: 0 12px; height: 32px; border-radius: 8px; cursor: pointer; font-size: 13px; display: inline-flex; align-items: center; justify-content: center; gap: 4px; transition: .2s; font-family: inherit; }
.nrc-hbtn:hover { background: rgba(255,255,255,.2); color: #fff; }

/* ─── Plan bar ─── */
.nrc-plan-bar { padding: 10px 20px; background: var(--nrc-accent-bg); border-bottom: 1px solid var(--nrc-border); font-size: 12px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.nrc-plan-name { font-weight: 700; color: var(--nrc-accent); }
.nrc-plan-quota { color: var(--nrc-text2); }
.nrc-plan-bar a { color: var(--nrc-accent); text-decoration: none; font-weight: 600; }
.nrc-plan-bar a:hover { text-decoration: underline; }

/* ─── Description ─── */
.nrc-description { padding: 14px 20px; background: var(--nrc-bg); color: var(--nrc-text2); font-size: 13px; line-height: 1.65; border-bottom: 1px solid var(--nrc-border); }

/* ─── Mode selector ─── */
.nrc-mode-tabs { display: flex; gap: 6px; padding: 12px 20px 0; background: var(--nrc-bg); flex-wrap: wrap; }
.nrc-mode-tab { background: var(--nrc-card); border: 1px solid var(--nrc-border); color: var(--nrc-text); padding: 9px 14px; border-radius: 10px 10px 0 0; cursor: pointer; font-weight: 600; transition: all .2s; font-size: 13px; display: flex; flex-direction: column; align-items: center; gap: 2px; min-width: 130px; font-family: inherit; }
.nrc-mode-tab small { color: var(--nrc-muted); font-size: 10px; font-weight: 400; }
.nrc-mode-tab.nrc-active { background: var(--nrc-accent); color: #fff; border-color: var(--nrc-accent); }
.nrc-mode-tab.nrc-active small { color: rgba(255,255,255,.85); }
.nrc-mode-tab:hover:not(.nrc-active) { border-color: var(--nrc-accent); }

/* ─── Body / sections ─── */
.nrc-body { padding: 16px; display: flex; flex-direction: column; gap: 16px; }
.nrc-section { background: var(--nrc-card); border: 1px solid var(--nrc-border); border-radius: 12px; overflow: hidden; box-shadow: var(--nrc-shadow); }
.nrc-section-header { padding: 12px 16px; background: var(--nrc-accent-bg); border-bottom: 1px solid var(--nrc-border); display: flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; transition: .2s; }
.nrc-section-header:hover { background: rgba(245,158,11,.15); }
.nrc-section-icon { font-size: 18px; }
.nrc-section-title { font-size: 14px; font-weight: 700; color: var(--nrc-accent); flex: 1; }
.nrc-section-toggle { font-size: 12px; color: var(--nrc-muted); transition: .3s; }
.nrc-section.collapsed .nrc-section-toggle { transform: rotate(-90deg); }
.nrc-section-body { padding: 16px; display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.nrc-section.collapsed .nrc-section-body { display: none; }

/* ─── Form fields ─── */
.nrc-field { position: relative; }
.nrc-field.nrc-field-full { grid-column: 1 / -1; }
.nrc-field label { display: flex; align-items: center; gap: 4px; font-weight: 600; font-size: 12px; color: var(--nrc-text2); margin-bottom: 4px; }
.nrc-field input, .nrc-field select { width: 100%; padding: 9px 11px; border: 1px solid var(--nrc-border); border-radius: 8px; font-size: 13.5px; color: var(--nrc-text); background: var(--nrc-input-bg); transition: .2s; font-family: inherit; box-shadow: inset 0 1px 2px rgba(0,0,0,.04); }
.nrc-field input:focus, .nrc-field select:focus { border-color: var(--nrc-accent); outline: none; box-shadow: 0 0 0 3px var(--nrc-accent-bg); }
.nrc-field-checkbox { display: flex; align-items: center; gap: 8px; }
.nrc-field-checkbox input[type=checkbox] { width: auto; }
.nrc-field-checkbox label { margin: 0; cursor: pointer; }
.nrc-tip { display: inline-flex; align-items: center; justify-content: center; width: 16px; height: 16px; background: var(--nrc-accent-bg); color: var(--nrc-accent); border-radius: 50%; font-size: 10px; font-weight: 700; cursor: help; flex-shrink: 0; position: relative; }
.nrc-tip::after { content: attr(data-tip); position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%); background: #1e293b; color: #fff; padding: 6px 10px; border-radius: 8px; font-size: 11px; font-weight: 400; white-space: normal; width: 240px; text-align: left; opacity: 0; pointer-events: none; transition: .2s; z-index: 100; line-height: 1.4; box-shadow: 0 4px 12px rgba(0,0,0,.2); }
.nrc-tip:hover::after { opacity: 1; }

.nrc-input-group { display: flex; gap: 6px; }
.nrc-input-group input { flex: 1; }
.nrc-input-group select { flex: 0 0 auto; width: auto; min-width: 70px; }

/* ─── Action bar ─── */
.nrc-action-bar { padding: 0 16px 16px; display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.nrc-btn { display: inline-flex; align-items: center; gap: 6px; padding: 11px 22px; background: linear-gradient(135deg, var(--nrc-accent), var(--nrc-accent-dk)); color: #fff; border: none; border-radius: 10px; font-size: 14px; font-weight: 700; cursor: pointer; transition: .2s; font-family: inherit; box-shadow: 0 2px 10px rgba(245,158,11,.25); }
.nrc-btn:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(245,158,11,.35); }
.nrc-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.nrc-btn.nrc-btn-secondary { background: var(--nrc-card); color: var(--nrc-text); border: 1px solid var(--nrc-border); box-shadow: none; }
.nrc-btn.nrc-btn-secondary:hover:not(:disabled) { border-color: var(--nrc-accent); color: var(--nrc-accent); background: var(--nrc-accent-bg); transform: none; }

/* ─── Results ─── */
.nrc-results { background: var(--nrc-card); border: 1px solid var(--nrc-border); border-radius: 12px; margin: 0 16px 16px; overflow: hidden; box-shadow: var(--nrc-shadow); }
.nrc-results-header { padding: 12px 16px; background: var(--nrc-results-header-bg); display: flex; align-items: center; gap: 8px; }
.nrc-results-header-text { color: #fff; font-weight: 700; font-size: 14px; }
.nrc-results-body { padding: 16px; }
.nrc-results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.nrc-result-card { background: var(--nrc-bg); border: 1px solid var(--nrc-border); border-radius: 10px; padding: 12px; text-align: center; transition: .2s; }
.nrc-result-card:hover { border-color: var(--nrc-accent); box-shadow: 0 2px 8px var(--nrc-accent-bg); }
.nrc-result-card.nrc-highlight { background: linear-gradient(180deg, var(--nrc-accent-bg) 0%, var(--nrc-bg) 100%); border-color: var(--nrc-accent); }
.nrc-result-label { font-size: 11px; color: var(--nrc-text2); margin-bottom: 4px; font-weight: 600; text-transform: uppercase; letter-spacing: .3px; }
.nrc-result-value { font-size: 22px; font-weight: 800; color: var(--nrc-accent); line-height: 1.1; }
.nrc-result-card.nrc-highlight .nrc-result-value { font-size: 28px; }
.nrc-result-detail { font-size: 11px; color: var(--nrc-text2); margin-top: 4px; padding-top: 4px; border-top: 1px solid var(--nrc-border); line-height: 1.4; }
.nrc-nec-ref { display: inline-flex; align-items: center; gap: 3px; padding: 1px 6px; background: rgba(37,99,235,.08); color: var(--nrc-blue); border-radius: 4px; font-size: 10px; font-weight: 600; border: 1px solid rgba(37,99,235,.15); }
.nrc-83-badge { display: inline-block; padding: 1px 6px; background: rgba(245,158,11,.15); color: var(--nrc-accent-dk); border-radius: 4px; font-size: 10px; font-weight: 700; }

/* ─── Loads breakdown ─── */
.nrc-breakdown { margin-top: 14px; }
.nrc-breakdown-title { font-size: 13px; font-weight: 700; color: var(--nrc-text); margin-bottom: 6px; }
.nrc-breakdown-table { width: 100%; border-collapse: collapse; background: var(--nrc-bg); border-radius: 10px; overflow: hidden; font-size: 12px; }
.nrc-breakdown-table th, .nrc-breakdown-table td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--nrc-border); }
.nrc-breakdown-table th { background: var(--nrc-accent-bg); color: var(--nrc-accent); font-weight: 700; text-transform: uppercase; font-size: 10px; letter-spacing: .4px; }
.nrc-cell-num { text-align: right; font-family: 'SF Mono', Consolas, monospace; font-weight: 600; }
.nrc-cell-ref { font-size: 10px; color: var(--nrc-muted); }
.nrc-row-total { background: var(--nrc-accent-bg); }
.nrc-row-total td { color: var(--nrc-accent); font-weight: 700; }

/* ─── Warnings ─── */
.nrc-warnings { margin-top: 12px; display: flex; flex-direction: column; gap: 6px; }
.nrc-warning { padding: 8px 12px; border-radius: 8px; font-size: 12px; line-height: 1.5; display: flex; gap: 8px; align-items: flex-start; }
.nrc-warning-info  { background: rgba(37,99,235,.06); border-left: 3px solid var(--nrc-blue); color: var(--nrc-text2); }
.nrc-warning-warn  { background: rgba(245,158,11,.06); border-left: 3px solid var(--nrc-accent); color: var(--nrc-text2); }
.nrc-warning-error { background: rgba(239,68,68,.06); border-left: 3px solid var(--nrc-red); color: var(--nrc-text2); }
.nrc-warning-ok    { background: rgba(16,185,129,.06); border-left: 3px solid var(--nrc-green); color: var(--nrc-text2); }

/* Code compliance advisory banners (SPD, Disconnect, Working space) — v1.1.4 */
.nrc-advisories { margin-top: 18px; padding: 14px 16px; background: linear-gradient(135deg, rgba(245,158,11,.04), rgba(245,158,11,.08)); border: 1px solid rgba(245,158,11,.25); border-radius: 10px; }
.nrc-advisories-title { font-size: 13px; font-weight: 700; color: var(--nrc-accent-dark, #92400e); margin-bottom: 10px; text-transform: uppercase; letter-spacing: .3px; }
.nrc-advisory { display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px; background: rgba(255,255,255,.6); border-radius: 8px; margin-bottom: 6px; border: 1px solid rgba(245,158,11,.12); }
.nrc-advisory:last-child { margin-bottom: 0; }
.nrc-advisory-icon { font-size: 22px; flex-shrink: 0; line-height: 1.2; }
.nrc-advisory-body { flex: 1; min-width: 0; }
.nrc-advisory-title { font-size: 14px; font-weight: 700; color: var(--nrc-text, #1e293b); margin-bottom: 4px; line-height: 1.4; }
.nrc-advisory-title .nrc-nec-ref { font-size: 11px; font-weight: 600; padding: 2px 6px; margin-left: 6px; }
.nrc-advisory-text { font-size: 13px; color: var(--nrc-text2, #475569); line-height: 1.5; }

/* ─── AI panel ─── */
.nrc-ai-section { margin: 0 16px 16px; display: flex; flex-direction: column; gap: 10px; }
.nrc-ai-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.nrc-ai-btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border: 1px solid var(--nrc-border); border-radius: 10px; background: var(--nrc-card); color: var(--nrc-text); font-size: 13px; font-weight: 600; cursor: pointer; transition: .2s; font-family: inherit; }
.nrc-ai-btn:hover:not(:disabled) { border-color: var(--nrc-accent); color: var(--nrc-accent); background: var(--nrc-accent-bg); }
.nrc-ai-btn:disabled { opacity: .5; cursor: not-allowed; }
.nrc-ai-response { background: var(--nrc-card); border: 1px solid var(--nrc-border); border-left: 4px solid var(--nrc-accent); border-radius: 12px; padding: 18px 22px; font-size: 13.5px; line-height: 1.75; color: var(--nrc-text); max-height: 600px; overflow-y: auto; box-shadow: 0 2px 8px rgba(0,0,0,.04); }
.nrc-ai-response:empty::before { content: "Las respuestas de la IA aparecerán aquí."; color: var(--nrc-muted); font-style: italic; }
.nrc-ai-response h1, .nrc-ai-response h2, .nrc-ai-response h3 { color: var(--nrc-accent); margin: 14px 0 6px; padding-bottom: 4px; border-bottom: 1px solid var(--nrc-border); font-size: 15px; }
.nrc-ai-response h3:first-child, .nrc-ai-response h2:first-child { margin-top: 0; }
.nrc-ai-response p { margin: 4px 0; }
.nrc-ai-response ul, .nrc-ai-response ol { padding-left: 28px; margin: 4px 0; }
.nrc-ai-response li { margin: 1px 0; line-height: 1.6; }
.nrc-ai-response strong { color: var(--nrc-accent-dk); font-weight: 700; }
.nrc-ai-response code { background: var(--nrc-accent-bg); padding: 2px 6px; border-radius: 4px; font-size: 12px; }
.nrc-ai-response table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 12px; }
.nrc-ai-response table th, .nrc-ai-response table td { padding: 6px 10px; border: 1px solid var(--nrc-border); text-align: left; }
.nrc-ai-response table th { background: var(--nrc-accent-bg); color: var(--nrc-accent); font-weight: 700; }
.nrc-ai-input-row { display: flex; gap: 8px; margin-top: 8px; }
.nrc-ai-input-row input { flex: 1; background: var(--nrc-input-bg); border: 1px solid var(--nrc-border); padding: 10px 12px; border-radius: 10px; color: var(--nrc-text); font-family: inherit; font-size: 13.5px; }
.nrc-ai-input-row input:focus { outline: none; border-color: var(--nrc-accent); box-shadow: 0 0 0 3px var(--nrc-accent-bg); }
.nrc-spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--nrc-accent-bg); border-top-color: var(--nrc-accent); border-radius: 50%; animation: nrc-spin .7s linear infinite; }
@keyframes nrc-spin { to { transform: rotate(360deg); } }

/* ─── Image upload ─── */
.nrc-image-upload { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 12px 16px; }
.nrc-image-label { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border: 2px dashed var(--nrc-border); border-radius: 10px; color: var(--nrc-text2); font-size: 13px; cursor: pointer; transition: .2s; font-weight: 600; }
.nrc-image-label:hover { border-color: var(--nrc-accent); color: var(--nrc-accent); background: var(--nrc-accent-bg); }
.nrc-image-status { padding: 0 16px 12px; }

/* ─── Modal panels (history, compare) — appended to body, with literal fallbacks ─── */
.nrc-panel-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.65); display: flex; align-items: center; justify-content: center; z-index: 99999; padding: 20px; backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; }
.nrc-panel { background: var(--nrc-bg, #ffffff); border-radius: 16px; padding: 24px; max-width: 900px; width: 100%; max-height: 85vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.4); border: 1px solid var(--nrc-border, #e2e8f0); color: var(--nrc-text, #1e293b); font-size: 14px; line-height: 1.6; }
.nrc-panel-title { color: var(--nrc-accent, #f59e0b); margin: 0 0 16px; font-size: 18px; font-weight: 700; }
.nrc-history-item { padding: 12px 14px; border: 1px solid var(--nrc-border, #e2e8f0); border-radius: 10px; margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; background: var(--nrc-card, #f8fafc); transition: .2s; }
.nrc-history-item:hover { border-color: var(--nrc-accent, #f59e0b); background: var(--nrc-accent-bg, rgba(245,158,11,.08)); }
.nrc-history-meta { font-size: 11px; color: var(--nrc-muted, #94a3b8); margin-top: 2px; }
.nrc-history-actions { display: flex; gap: 6px; }
.nrc-history-actions button { background: transparent; border: 1px solid var(--nrc-border, #e2e8f0); padding: 4px 10px; border-radius: 6px; cursor: pointer; font-size: 11px; color: var(--nrc-text2, #475569); font-family: inherit; }
.nrc-history-actions button:hover { background: var(--nrc-card, #f8fafc); border-color: var(--nrc-accent, #f59e0b); color: var(--nrc-accent, #f59e0b); }

/* ─── Compare ─── */
.nrc-compare-table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 12.5px; background: var(--nrc-bg, #fff); }
.nrc-compare-table th, .nrc-compare-table td { padding: 9px 11px; border-bottom: 1px solid var(--nrc-border, #e2e8f0); text-align: left; vertical-align: middle; }
.nrc-compare-table thead th { background: var(--nrc-accent-bg, rgba(245,158,11,.08)); color: var(--nrc-accent, #f59e0b); font-weight: 700; text-transform: uppercase; font-size: 11px; letter-spacing: .4px; }
.nrc-compare-table th:first-child { width: 32%; }
.nrc-compare-table tbody tr:nth-child(even) td { background: rgba(0,0,0,0.015); }
.nrc-compare-best-badge { display: inline-block; padding: 1px 6px; background: var(--nrc-green, #10b981); color: #fff; border-radius: 4px; font-size: 10px; font-weight: 700; margin-left: 6px; vertical-align: middle; }
.nrc-compare-na { color: var(--nrc-muted, #94a3b8); font-style: italic; font-size: 11.5px; }

/* ─── Disclaimer ─── */
.nrc-disclaimer { padding: 14px 20px; background: var(--nrc-card); border-top: 1px solid var(--nrc-border); font-size: 11px; color: var(--nrc-muted); line-height: 1.55; }
.nrc-disclaimer strong { color: var(--nrc-accent); }

/* ─── Loading state ─── */
.nrc-loading { display: flex; align-items: center; justify-content: center; padding: 30px; color: var(--nrc-muted); gap: 10px; font-size: 13px; }
.nrc-loading .nrc-spinner { width: 20px; height: 20px; }

/* Mobile */
@media (max-width: 600px) {
    #nrc-calculator-root { padding: 14px 12px 24px; }
    .nrc-header { padding: 12px 14px; }
    .nrc-header-title { font-size: 14px; }
    .nrc-section-body { grid-template-columns: 1fr; }
    .nrc-mode-tab { min-width: 100px; padding: 7px 10px; font-size: 11px; }
    .nrc-mode-tab small { font-size: 9px; }
    .nrc-results, .nrc-ai-section { margin-left: 12px; margin-right: 12px; }
    .nrc-panel { padding: 16px; }
}