/* ── REGLA ONLINE — Physical Ruler Aesthetic ── */
:root {
  --ruler-bg: #f5d77a;
  --ruler-dark: #d4a520;
  --ruler-edge: #b8860b;
  --ruler-num: #4a2e0a;
  --wood: #8B6914;
  --bg: #f0ede6;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-dim: #666;
  --blue: #2563eb;
  --border: #d1c5a5;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0,0,0,.12);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body { font-family: 'DM Sans', system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

/* Header */
.header { background: #fff; border-bottom: 2px solid var(--ruler-edge); box-shadow: var(--shadow); position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: 1100px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-size: 1.05rem; font-weight: 700; }
.logo-icon { font-size: 1.4rem; }
.header-controls { display: flex; align-items: center; gap: 12px; }
.unit-toggle { display: flex; background: #f3f4f6; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
.unit-btn { padding: 7px 20px; border: none; background: transparent; font-family: 'DM Mono', monospace; font-size: .9rem; font-weight: 500; cursor: pointer; color: var(--text-dim); transition: all .2s; }
.unit-btn.active { background: var(--ruler-edge); color: #fff; }
.calib-btn { padding: 7px 16px; border: 1px solid var(--border); border-radius: 8px; background: #fff; color: var(--text); font-family: inherit; font-size: .85rem; cursor: pointer; transition: all .2s; }
.calib-btn:hover { border-color: var(--blue); color: var(--blue); }

/* Hero */
.hero { text-align: center; padding: 48px 24px 32px; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; margin-bottom: 10px; }
.highlight { color: var(--ruler-edge); }
.hero-sub { color: var(--text-dim); font-size: 1rem; max-width: 440px; margin: 0 auto; }

/* Ruler container */
.ruler-container {
  background: var(--ruler-bg);
  background-image: linear-gradient(180deg, #fde896 0%, var(--ruler-bg) 30%, #e8c050 70%, var(--ruler-dark) 100%);
  border-top: 4px solid var(--ruler-edge);
  border-bottom: 4px solid var(--ruler-edge);
  box-shadow: 0 4px 20px rgba(0,0,0,.2), inset 0 2px 4px rgba(255,255,255,.4);
  position: relative;
  overflow: hidden;
  user-select: none;
  cursor: grab;
}
.ruler-container:active { cursor: grabbing; }
#ruler-canvas { display: block; }
.ruler-overlay { position: absolute; inset: 0; pointer-events: none; }
.drag-hint { position: absolute; bottom: 4px; right: 16px; font-family: 'DM Mono', monospace; font-size: .65rem; color: var(--ruler-edge); opacity: .7; }

/* Info bar */
.ruler-info-bar {
  background: #fff;
  border-bottom: 2px solid var(--border);
  padding: 10px 24px;
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
  font-size: .85rem;
}
.info-item { display: flex; gap: 6px; align-items: center; }
.info-label { color: var(--text-dim); }
.info-val { font-family: 'DM Mono', monospace; font-weight: 600; color: var(--text); }
.flip-btn { margin-left: auto; padding: 5px 14px; border: 1px solid var(--border); border-radius: 6px; background: #fff; font-size: .8rem; cursor: pointer; transition: all .2s; }
.flip-btn:hover { background: var(--bg); }

/* Container */
.container { max-width: 1000px; margin: 0 auto; padding: 32px 24px 48px; }

/* Tool card */
.tool-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; margin-bottom: 20px; box-shadow: var(--shadow); }
.tool-card h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.calib-card.hidden { display: none; }

/* Calibration */
.calib-row { display: flex; align-items: center; gap: 16px; margin: 14px 0; flex-wrap: wrap; }
.calib-row label { font-size: .9rem; color: var(--text-dim); flex-shrink: 0; }
#calib-slider { flex: 1; min-width: 150px; accent-color: var(--ruler-edge); }
.calib-val { font-family: 'DM Mono', monospace; font-weight: 600; color: var(--text); min-width: 60px; }
.calib-note { font-size: .85rem; color: var(--text-dim); margin-bottom: 12px; font-style: italic; }
.calib-line { height: 4px; background: var(--ruler-edge); border-radius: 2px; margin: 12px 0 20px; transition: width .1s; }
.calib-actions { display: flex; gap: 10px; }
.btn-apply { padding: 9px 24px; background: var(--ruler-edge); color: #fff; border: none; border-radius: 8px; font-family: inherit; font-size: .9rem; font-weight: 600; cursor: pointer; transition: all .2s; }
.btn-apply:hover { background: var(--wood); }
.btn-reset { padding: 9px 20px; background: #fff; color: var(--text); border: 1px solid var(--border); border-radius: 8px; font-family: inherit; font-size: .9rem; cursor: pointer; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px,1fr)); gap: 16px; }
.step { display: flex; gap: 12px; align-items: flex-start; }
.step-n { width: 28px; height: 28px; border-radius: 50%; background: var(--ruler-edge); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .85rem; flex-shrink: 0; }
.step p { font-size: .88rem; color: var(--text-dim); line-height: 1.5; }
.step p strong { color: var(--text); }

/* Conversion tables */
.conv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; overflow-x: auto; }
.conv-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.conv-table th { background: var(--bg); padding: 9px 12px; text-align: left; font-weight: 700; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; border-bottom: 2px solid var(--border); }
.conv-table td { padding: 7px 12px; border-bottom: 1px solid var(--border); font-family: 'DM Mono', monospace; }
.conv-table tr:hover td { background: var(--bg); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 6px; }
.faq-item { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.faq-item summary { padding: 12px 16px; font-weight: 600; font-size: .9rem; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::after { content: '+'; color: var(--ruler-edge); font-size: 1.1rem; }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { padding: 0 16px 12px; color: var(--text-dim); font-size: .88rem; line-height: 1.6; }

/* Footer */
.footer { background: var(--ruler-edge); color: rgba(255,255,255,.8); padding: 20px 24px; }
.footer-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; font-size: .82rem; flex-wrap: wrap; gap: 12px; }
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: rgba(255,255,255,.7); text-decoration: none; }
.footer-links a:hover { color: #fff; }

@media(max-width:600px) {
  .conv-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
}

/* ── Inner Pages & Footer Extensions ── */
.footer-links-ro { display:flex; flex-wrap:wrap; gap:10px 18px; justify-content:center; margin:12px 0; }
.footer-links-ro a { color:rgba(255,255,255,.7); text-decoration:none; font-size:.82rem; }
.footer-links-ro a:hover { color:#fff; }
.content-page-ro { max-width:860px; margin:0 auto; padding:40px 24px; }
.content-page-ro h1 { font-size:2rem; font-weight:800; margin-bottom:20px; color:var(--text); }
.content-page-ro h2 { font-size:1.15rem; font-weight:700; color:var(--ruler-edge); margin:24px 0 12px; border-left:3px solid var(--ruler-edge); padding-left:12px; }
.content-page-ro p { color:var(--text-dim); line-height:1.7; margin-bottom:12px; }
.faq-ro { margin-top:20px; }
.faq-ro-item { border:1px solid var(--border); border-radius:8px; margin-bottom:8px; overflow:hidden; background:#fff; }
.faq-ro-q { width:100%; padding:14px 18px; background:#fff; border:none; text-align:left; font-family:'DM Sans',sans-serif; font-size:.9rem; font-weight:600; cursor:pointer; display:flex; justify-content:space-between; align-items:center; color:var(--text); }
.faq-ro-q:hover { background:var(--bg); }
.faq-ro-item.open .faq-ro-q { background:var(--ruler-bg); color:var(--ruler-num); }
.faq-ro-icon { color:var(--ruler-edge); font-size:1.1rem; transition:transform .3s; }
.faq-ro-item.open .faq-ro-icon { transform:rotate(45deg); }
.faq-ro-a { display:none; padding:0 18px 14px; color:var(--text-dim); font-size:.88rem; line-height:1.6; background:#fff; }
.faq-ro-item.open .faq-ro-a { display:block; }
.related-ro { display:grid; grid-template-columns:repeat(auto-fill,minmax(160px,1fr)); gap:10px; margin-top:14px; }
.related-ro a { display:block; padding:14px; background:var(--bg); border:1px solid var(--border); border-radius:8px; text-decoration:none; color:var(--text); font-size:.88rem; font-weight:600; text-align:center; transition:all .2s; }
.related-ro a:hover { background:var(--ruler-bg); border-color:var(--ruler-edge); }
.mini-ruler { height:60px; background:linear-gradient(180deg,#fde896,var(--ruler-bg),#d4a520); border:2px solid var(--ruler-edge); border-radius:6px; position:relative; margin:16px 0; overflow:hidden; }
.conv-table-full { width:100%; border-collapse:collapse; margin:12px 0; }
.conv-table-full th { background:var(--ruler-edge); color:#fff; padding:10px 14px; text-align:left; font-size:.85rem; }
.conv-table-full td { padding:9px 14px; border-bottom:1px solid var(--border); font-family:'DM Mono',monospace; font-size:.88rem; }
.conv-table-full tr:nth-child(even) td { background:var(--bg); }
.conv-table-full tr:hover td { background:var(--ruler-bg); }
.calibration-steps { counter-reset:step; }
.calib-step { display:flex; gap:16px; margin-bottom:20px; align-items:flex-start; }
.calib-step-num { width:36px; height:36px; border-radius:50%; background:var(--ruler-edge); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:700; flex-shrink:0; }
.calib-step-content h3 { font-size:.95rem; font-weight:700; margin-bottom:6px; }
.calib-step-content p { font-size:.88rem; color:var(--text-dim); margin:0; }

/* ── .content-page-regla ── */
.content-page-regla { max-width:860px; margin:0 auto; padding:40px 24px; position:relative; z-index:1; }