/* ── Tools Design System — porcentaje.net ── */
/* Matches header/footer tokens exactly. One file for all tool pages. */

:root {
  --bg:        #0b0f1a;
  --surface:   #111827;
  --surface2:  #151d2e;
  --surface3:  #1a2235;
  --border:    rgba(255,255,255,.07);
  --border2:   rgba(255,255,255,.12);
  --accent:    #00e5a0;
  --accent2:   #00aaff;
  --accent-glow: rgba(0,229,160,.15);
  --accent2-glow: rgba(0,170,255,.15);
  --text:      #f0f4ff;
  --muted:     #8b95b0;
  --muted2:    #5a6480;
  --green:     #00e5a0;
  --red:       #ff4d6d;
  --yellow:    #ffd166;
  --font-d:    'Syne', system-ui, sans-serif;
  --font-b:    'DM Sans', system-ui, sans-serif;
  --font-mono: 'DM Mono', 'Fira Mono', ui-monospace, monospace;
  --radius:    12px;
  --radius-sm: 8px;
  --tr:        .22s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-b);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Page wrapper ── */
.tool-page {
  padding: 48px 16px 96px;
}
.tool-wrap {
  max-width: 760px;
  margin: 0 auto;
}
.tool-wrap-wide {
  max-width: 960px;
  margin: 0 auto;
}

/* ── Hero ── */
.tool-hero {
  margin-bottom: 40px;
}
.tool-hero.centered { text-align: center; }
.tool-hero.centered .tool-hero-desc { margin: 0 auto; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,229,160,.1);
  border: 1px solid rgba(0,229,160,.25);
  color: var(--accent);
  font-family: var(--font-b);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 18px;
}

.tool-hero h1 {
  font-family: var(--font-d);
  font-size: clamp(26px, 5vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: 14px;
}

.tool-hero h1 .hl {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tool-hero-desc {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 560px;
}

/* ── Calculator Card ── */
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 20px;
  transition: border-color var(--tr);
}
.tool-card:hover { border-color: var(--border2); }

.tool-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.tool-card-icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0,229,160,.15), rgba(0,170,255,.15));
  border: 1px solid rgba(0,229,160,.2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.tool-card h2 {
  font-family: var(--font-d);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
}
.tool-card-desc {
  font-size: .875rem;
  color: var(--muted);
  margin-bottom: 24px;
  line-height: 1.6;
  padding-left: 48px;
}

/* ── Fields ── */
.fields-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}
.fields-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field label {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
}
.field input,
.field select {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 500;
  background: var(--surface2);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  outline: none;
  width: 100%;
  transition: border-color var(--tr), box-shadow var(--tr), background var(--tr);
  -webkit-appearance: none;
}
.field input::placeholder { color: var(--muted2); }
.field input:focus,
.field select:focus {
  border-color: var(--accent);
  background: var(--surface3);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.field select {
  font-family: var(--font-b);
  font-size: 1rem;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b95b0' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.field select option { background: var(--surface); color: var(--text); }

/* ── Buttons ── */
.btn-calc {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 24px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  color: #0b0f1a;
  font-family: var(--font-b);
  font-size: .95rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity var(--tr), transform var(--tr), box-shadow var(--tr);
  letter-spacing: .02em;
}
.btn-calc:hover {
  opacity: .92;
  box-shadow: 0 4px 24px rgba(0,229,160,.3);
  transform: translateY(-1px);
}
.btn-calc:active { transform: scale(.98); }

.btn-reset {
  background: var(--surface2);
  border: 1.5px solid var(--border2);
  color: var(--muted);
  font-family: var(--font-b);
  font-size: .825rem;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--tr), border-color var(--tr), background var(--tr);
}
.btn-reset:hover { color: var(--text); border-color: var(--muted2); background: var(--surface3); }

.btn-row {
  display: flex;
  gap: 10px;
  align-items: center;
}
.btn-row .btn-calc { flex: 1; }

/* ── Result Box ── */
.result-box {
  display: none;
  margin-top: 20px;
  background: linear-gradient(135deg, rgba(0,229,160,.06), rgba(0,170,255,.06));
  border: 1.5px solid rgba(0,229,160,.2);
  border-radius: var(--radius);
  padding: 20px 24px;
  animation: fadeUp .22s ease;
}
.result-box.show { display: block; }
.result-box.result-warn { border-color: rgba(255,77,109,.3); background: rgba(255,77,109,.05); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-label {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: 4px;
}
.result-box.result-warn .result-label { color: var(--red); }

.result-value {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 4px;
}
.result-value.result-up   { color: var(--green); }
.result-value.result-down { color: var(--red); }

.result-explain {
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 6px;
}

/* Multi-result grid */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin-top: 20px;
  animation: fadeUp .22s ease;
}
.result-grid.hidden { display: none; }

.result-cell {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.result-cell .rc-label {
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  font-weight: 600;
}
.result-cell .rc-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text);
  margin-top: 2px;
}
.result-cell.accent-cell { border-color: rgba(0,229,160,.25); }
.result-cell.accent-cell .rc-label { color: var(--accent); }
.result-cell.accent-cell .rc-value { color: var(--accent); }
.result-cell.red-cell { border-color: rgba(255,77,109,.25); }
.result-cell.red-cell .rc-value { color: var(--red); }
.result-cell.green-cell .rc-value { color: var(--green); }

/* ── Progress Bar ── */
.pct-bar-wrap {
  margin-top: 16px;
  background: var(--surface2);
  border-radius: 100px;
  height: 8px;
  overflow: hidden;
}
.pct-bar-fill {
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  width: 0%;
  transition: width .6s cubic-bezier(.4,0,.2,1);
}

/* ── Tabs ── */
.tool-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
}
.tool-tab {
  flex: 1;
  min-width: 120px;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-b);
  font-size: .825rem;
  font-weight: 500;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background var(--tr), color var(--tr);
  text-align: center;
  white-space: nowrap;
}
.tool-tab:hover { color: var(--text); background: var(--surface2); }
.tool-tab.active {
  background: linear-gradient(135deg, rgba(0,229,160,.15), rgba(0,170,255,.12));
  color: var(--accent);
  font-weight: 600;
  border: 1px solid rgba(0,229,160,.2);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp .2s ease; }

/* ── Toggle Row (gender / mode) ── */
.toggle-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  background: var(--surface2);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 24px;
}
.toggle-btn {
  padding: 11px 8px;
  font-family: var(--font-b);
  font-size: .875rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background var(--tr), color var(--tr);
  text-align: center;
}
.toggle-btn:hover { color: var(--text); }
.toggle-btn.active {
  background: linear-gradient(135deg, rgba(0,229,160,.18), rgba(0,170,255,.14));
  color: var(--accent);
}

/* ── Info / Educational Cards ── */
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 20px;
}
.info-card h2 {
  font-family: var(--font-d);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
  margin-bottom: 14px;
}
.info-card h3 {
  font-family: var(--font-d);
  font-size: .95rem;
  font-weight: 700;
  color: var(--accent);
  margin: 20px 0 8px;
}
.info-card p {
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 10px;
}
.info-card ul, .info-card ol {
  padding-left: 20px;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.8;
}
.info-card li { margin-bottom: 4px; }

/* Formula box */
.formula-box {
  background: var(--surface2);
  border: 1.5px solid var(--border2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--accent);
  line-height: 1.9;
  margin: 14px 0;
  overflow-x: auto;
}

/* Steps */
.steps { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.step-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #0b0f1a;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: .8rem;
  flex-shrink: 0;
}
.step-body strong { font-size: .875rem; font-weight: 700; color: var(--text); display: block; margin-bottom: 2px; }
.step-body p { font-size: .825rem; color: var(--muted); line-height: 1.5; margin: 0; }

/* Example table */
.ex-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.ex-table th {
  text-align: left; font-size: .68rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
  padding: 0 0 10px; border-bottom: 1px solid var(--border2);
  font-weight: 600;
}
.ex-table td { padding: 11px 0; border-bottom: 1px solid var(--border); color: var(--muted); }
.ex-table tr:last-child td { border-bottom: none; }
.ex-table .num { font-family: var(--font-mono); color: var(--accent); font-weight: 500; }

/* ── Range tables / reference ── */
.ref-table {
  width: 100%; border-collapse: collapse; font-size: .875rem;
  margin-top: 8px;
}
.ref-table th {
  background: var(--surface2); color: var(--muted);
  font-size: .68rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border2);
}
.ref-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); color: var(--muted); }
.ref-table tr:last-child td { border-bottom: none; }
.ref-table .accent { color: var(--accent); font-weight: 600; }
.ref-table .badge-pill {
  display: inline-block; padding: 2px 9px; border-radius: 100px;
  font-size: .7rem; font-weight: 600;
}
.badge-essential   { background: rgba(0,229,160,.15); color: var(--accent); border: 1px solid rgba(0,229,160,.3); }
.badge-optimal     { background: rgba(0,170,255,.12); color: var(--accent2); border: 1px solid rgba(0,170,255,.3); }
.badge-acceptable  { background: rgba(255,209,102,.1); color: #ffd166; border: 1px solid rgba(255,209,102,.3); }
.badge-high        { background: rgba(255,77,109,.1); color: var(--red); border: 1px solid rgba(255,77,109,.3); }
.badge-obese       { background: rgba(255,77,109,.18); color: var(--red); border: 1px solid rgba(255,77,109,.4); }

/* ── Homepage tools grid ── */
.tools-section-title {
  font-family: var(--font-d);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
  margin-bottom: 6px;
}
.tools-section-sub {
  font-size: .9rem;
  color: var(--muted);
  margin-bottom: 28px;
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 48px;
}
.tool-link-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  text-decoration: none;
  transition: border-color var(--tr), transform var(--tr), box-shadow var(--tr);
}
.tool-link-card:hover {
  border-color: rgba(0,229,160,.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,.3);
}
.tlc-icon {
  width: 42px; height: 42px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0,229,160,.12), rgba(0,170,255,.12));
  border: 1px solid rgba(0,229,160,.18);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 14px;
}
.tlc-title {
  font-family: var(--font-d);
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.tlc-desc {
  font-size: .8rem;
  color: var(--muted);
  line-height: 1.55;
}
.tlc-arrow {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: .75rem;
  color: var(--accent);
  font-weight: 600;
  margin-top: 12px;
  transition: gap var(--tr);
}
.tool-link-card:hover .tlc-arrow { gap: 8px; }

/* ── Love meter ── */
.love-meter {
  position: relative;
  margin: 24px 0;
  text-align: center;
}
.love-circle {
  width: 150px; height: 150px;
  border-radius: 50%;
  border: 4px solid var(--border2);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  margin: 0 auto 16px;
  background: var(--surface2);
  transition: border-color .4s;
}
.love-circle.show { border-color: var(--red); box-shadow: 0 0 40px rgba(255,77,109,.2); }
.love-pct {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 500;
  color: var(--text);
}
.love-hearts { font-size: 1.2rem; letter-spacing: 2px; }

/* ── Exercises / quiz ── */
.exercise-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 16px;
}
.exercise-card .ex-q {
  font-size: .975rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.5;
}
.ex-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.ex-option {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface2); border: 1.5px solid var(--border2);
  border-radius: var(--radius-sm); padding: 11px 16px;
  cursor: pointer; font-size: .875rem; color: var(--muted);
  transition: border-color var(--tr), color var(--tr), background var(--tr);
}
.ex-option:hover { border-color: var(--accent); color: var(--text); }
.ex-option.correct { border-color: var(--green); background: rgba(0,229,160,.07); color: var(--green); }
.ex-option.wrong   { border-color: var(--red); background: rgba(255,77,109,.07); color: var(--red); }
.ex-option.disabled { pointer-events: none; opacity: .6; }
.ex-option.correct.disabled { opacity: 1; }

.ex-feedback {
  font-size: .85rem; padding: 10px 14px; border-radius: var(--radius-sm);
  display: none; line-height: 1.5;
}
.ex-feedback.correct { background: rgba(0,229,160,.1); border: 1px solid rgba(0,229,160,.25); color: var(--accent); display: block; }
.ex-feedback.wrong   { background: rgba(255,77,109,.08); border: 1px solid rgba(255,77,109,.25); color: var(--red); display: block; }

/* ── Guide / how-to page ── */
.guide-step {
  display: flex; gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.guide-step:last-child { border-bottom: none; }
.gs-num {
  font-family: var(--font-d);
  font-size: 2.5rem; font-weight: 800;
  color: rgba(0,229,160,.15);
  line-height: 1; flex-shrink: 0; width: 48px; text-align: right;
  padding-top: 4px;
}
.gs-body h3 { font-family: var(--font-d); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.gs-body p  { font-size: .875rem; color: var(--muted); line-height: 1.7; margin-bottom: 8px; }

/* ── Divider ── */
.tool-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

/* ── Answer box (featured snippet / answer-first) ── */
.answer-box {
  background: linear-gradient(135deg, rgba(0,229,160,.08), rgba(0,170,255,.05));
  border: 1.5px solid rgba(0,229,160,.25);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 20px;
}
.answer-box .ab-label {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: 10px;
}
.answer-box p { font-size: .9rem; color: var(--text); line-height: 1.75; margin: 0 0 6px; }
.answer-box p:last-child { margin-bottom: 0; }
.answer-box strong { color: var(--accent); }

/* ── FAQ section ── */
.faq-section { display: flex; flex-direction: column; gap: 12px; margin-top: 14px; }
.faq-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}
.faq-q { font-size: .9rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.faq-a { font-size: .875rem; color: var(--muted); line-height: 1.7; }
.faq-a strong { color: var(--accent); }

/* ── Related links grid ── */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.related-link {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-decoration: none;
  font-size: .85rem;
  font-weight: 600;
  color: var(--muted);
  transition: color var(--tr), border-color var(--tr), background var(--tr);
}
.related-link:hover {
  color: var(--accent);
  border-color: rgba(0,229,160,.3);
  background: var(--surface3);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .tool-page { padding: 32px 14px 72px; }
  .tool-card { padding: 22px 18px; }
  .info-card { padding: 22px 18px; }
  .result-value { font-size: 1.9rem; }
  .tool-hero h1 { font-size: clamp(22px, 7vw, 34px); }
  .tool-card-desc { padding-left: 0; }
  .tool-tabs { flex-direction: column; gap: 4px; }
  .tool-tab { text-align: left; }
  .guide-step { gap: 12px; }
  .gs-num { width: 32px; font-size: 1.8rem; }
  .related-grid { grid-template-columns: 1fr 1fr; }
}