/* =============================================================
   SOLARIS — MVP landing
   Arquetipo: Glassmorphism Modern, adaptado a paleta solar
   1. Tokens  2. Reset  3. Utilities  4. Typography  5. Components
   6. Sections  7. Effects  8. Responsive  9. Reduced-motion
   ============================================================= */

/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg:        #fbf7f0;   /* warm off-white */
  --bg-soft:   #f4ecdd;
  --glass:     rgba(255, 255, 255, 0.55);
  --glass-2:   rgba(255, 255, 255, 0.30);
  --glass-border: rgba(255, 255, 255, 0.65);

  --ink:       #1c2230;
  --ink-soft:  #4a5468;
  --ink-mute:  #7b8496;

  --accent:    #f5a524;   /* solar amber */
  --accent-2:  #2f6fed;   /* sky blue */
  --accent-soft: #ffe3b0;

  --line:      rgba(28, 34, 48, 0.10);

  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  --nav-h: 76px;
  --radius: 20px;
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }

@view-transition { navigation: auto; }

body {
  font-family: "Inter", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.08; letter-spacing: -0.02em; color: var(--ink); font-family: "Space Grotesk", "Inter", sans-serif; }
ul { list-style: none; padding: 0; }
::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 6px;
}

/* =============================================================
   3. Utilities
   ============================================================= */
.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--ink); color: #fff;
  z-index: 9999; border-radius: 8px; font-weight: 500;
  transition: top .25s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

.container {
  width: min(1180px, 100% - 2.5rem);
  margin-inline: auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  position: relative;
}
.section-head {
  max-width: 640px;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section-head h2 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); margin-top: .6rem; }
.section-head p { margin-top: 1rem; font-size: 1.05rem; }
.section-head.center { margin-inline: auto; text-align: center; }

/* =============================================================
   4. Typography
   ============================================================= */
.hero-title { font-size: clamp(2.6rem, 6vw, 4.6rem); }
.em-accent { color: var(--accent); font-style: normal; }
.em-blue { color: var(--accent-2); font-style: normal; }

/* =============================================================
   5. Components
   ============================================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5rem;
  padding: .95rem 1.7rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: .98rem;
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), background .3s var(--ease-out);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #ff8a3d);
  color: #201200;
  box-shadow: 0 14px 30px -12px rgba(245, 165, 36, .65);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px -12px rgba(245, 165, 36, .8); }

.btn-ghost {
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  color: var(--ink);
}
.btn-ghost:hover { transform: translateY(-2px); background: rgba(255,255,255,0.75); }

.glass-card {
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
}
@supports not (backdrop-filter: blur(20px)) {
  .glass-card { background: rgba(255,255,255,0.86); }
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .85rem;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  font-size: .82rem;
  font-weight: 600;
  color: var(--ink-soft);
}

/* =============================================================
   6. Sections
   ============================================================= */

/* --- Nav --- */
.nav {
  position: fixed; inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
}
.nav-inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
}
.nav-glass {
  position: absolute; inset: 0;
  background: rgba(251, 247, 240, 0.55);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--line);
  transition: background .3s var(--ease-out), box-shadow .3s var(--ease-out);
}
.nav.is-scrolled .nav-glass { background: rgba(251, 247, 240, 0.85); box-shadow: 0 8px 30px -20px rgba(28,34,48,.35); }

.brand {
  display: flex; align-items: center; gap: .55rem;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700; font-size: 1.2rem; color: var(--ink);
  position: relative; z-index: 1;
}
.brand-mark {
  width: 34px; height: 34px;
  display: grid; place-items: center;
}

.nav-links {
  display: flex; align-items: center; gap: 2rem;
  position: relative; z-index: 1;
}
.nav-links a {
  position: relative;
  font-size: .93rem; font-weight: 500; color: var(--ink-soft);
  padding-bottom: 3px;
}
.nav-links a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; background: var(--accent);
  transition: right .3s var(--ease-out);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { right: 0; }

.nav-actions { position: relative; z-index: 1; display: flex; align-items: center; gap: .75rem; }
.nav-toggle { display: none; }

/* --- Hero --- */
.hero {
  position: relative;
  padding-top: calc(var(--nav-h) + clamp(3rem, 8vw, 6rem));
  padding-bottom: clamp(3rem, 8vw, 5rem);
  overflow: clip;
}
.hero-mesh {
  position: absolute; inset: -10% -10% auto -10%; height: 900px;
  z-index: -1;
  background:
    radial-gradient(at 15% 20%, rgba(245,165,36,0.45) 0%, transparent 55%),
    radial-gradient(at 85% 15%, rgba(47,111,237,0.30) 0%, transparent 55%),
    radial-gradient(at 50% 80%, rgba(255,138,61,0.30) 0%, transparent 55%);
  filter: blur(70px) saturate(140%);
  animation: meshDrift 34s ease-in-out infinite;
}
@keyframes meshDrift {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50%      { transform: scale(1.18) rotate(8deg); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero-copy .eyebrow { margin-bottom: 1.1rem; }
.hero-copy p.lead {
  margin-top: 1.3rem;
  font-size: 1.12rem;
  max-width: 46ch;
}
.hero-actions {
  margin-top: 2.1rem;
  display: flex; flex-wrap: wrap; gap: .9rem;
}
.hero-proof {
  margin-top: 2.6rem;
  display: flex; flex-wrap: wrap; gap: .6rem;
}

.hero-visual { position: relative; }
.hero-illustration {
  width: 100%; height: auto;
  filter: drop-shadow(0 40px 60px rgba(28,34,48,0.18));
}
.hero-float-card {
  position: absolute;
  padding: .9rem 1.1rem;
  min-width: 168px;
}
.hero-float-card.fc-1 { top: 6%; left: -6%; }
.hero-float-card.fc-2 { bottom: 10%; right: -4%; }
.fc-label { font-size: .72rem; color: var(--ink-mute); font-weight: 600; text-transform: uppercase; letter-spacing: .06em; }
.fc-value { font-family: "Space Grotesk", sans-serif; font-size: 1.5rem; font-weight: 700; color: var(--ink); margin-top: .15rem; }
.fc-value span.unit { font-size: .95rem; color: var(--accent); }

/* --- Trust strip --- */
.trust-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.6rem 0;
}
.trust-strip .container {
  display: flex; flex-wrap: wrap; gap: 2.4rem 3rem;
  align-items: center; justify-content: center;
  color: var(--ink-mute);
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .03em;
  text-transform: uppercase;
}

/* --- Steps (Cómo funciona) --- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
.step-card {
  padding: 1.9rem 1.6rem;
  display: flex; flex-direction: column; gap: .9rem;
  transition: transform .4s var(--ease-out), box-shadow .4s var(--ease-out);
}
.step-card:hover { transform: translateY(-6px); box-shadow: 0 24px 50px -28px rgba(28,34,48,.35); }
.step-n {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.6rem; font-weight: 700; color: var(--accent);
}
.step-card h3 { font-size: 1.12rem; }
.step-card p { font-size: .95rem; }

/* --- Benefits / Ahorro --- */
.ahorro-section { position: relative; overflow: clip; }
.ahorro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.benefit-list { display: flex; flex-direction: column; gap: 1.1rem; }
.benefit-item {
  padding: 1.4rem 1.5rem;
  display: flex; gap: 1rem; align-items: flex-start;
}
.benefit-icon {
  flex: none;
  width: 44px; height: 44px;
  border-radius: 14px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent-soft), #fff);
  color: var(--accent);
}
.benefit-item h3 { font-size: 1.02rem; margin-bottom: .3rem; }
.benefit-item p { font-size: .93rem; }

.stats-card {
  padding: 2.2rem;
  position: sticky; top: calc(var(--nav-h) + 2rem);
}
.stats-card .eyebrow { margin-bottom: 1rem; }
.stat-row {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
}
.stat-row:last-of-type { border-bottom: 0; }
.stat-value {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2.1rem; font-weight: 700; color: var(--ink);
}
.stat-value .suffix { font-size: 1.1rem; color: var(--accent); }
.stat-label { font-size: .85rem; color: var(--ink-mute); max-width: 15ch; text-align: right; }

.calc-teaser {
  margin-top: 1.4rem;
  padding: 1.3rem 1.5rem;
  display: flex; flex-direction: column; align-items: flex-start; gap: .9rem;
  background: linear-gradient(135deg, var(--accent), #ff8a3d);
  border-radius: var(--radius);
  color: #201200;
}
.calc-teaser p { color: rgba(32,18,0,.82); font-size: .88rem; }
.calc-teaser strong { display: block; font-family: "Space Grotesk", sans-serif; font-size: 1.05rem; margin-bottom: .2rem; color: #201200; }
.calc-open-btn {
  align-self: stretch;
  justify-content: center;
  background: #201200;
  color: #ffe3b0;
  box-shadow: none;
}
.calc-open-btn:hover { transform: translateY(-2px); background: #2c1a02; }

/* --- Instalación (proceso visual) --- */
.instalacion-section { position: relative; }
.instalacion-panel {
  padding: clamp(2.4rem, 5vw, 3.6rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}
.instalacion-list { display: flex; flex-direction: column; gap: 1.3rem; }
.instalacion-list li { display: flex; gap: .9rem; align-items: flex-start; font-size: .98rem; }
.check-dot {
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent);
  display: grid; place-items: center;
  color: #201200;
}

/* --- Testimonials --- */
.testi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}
.testi-card { padding: 1.8rem; }
.testi-card p.quote { font-size: 1.02rem; color: var(--ink-soft); }
.testi-foot { margin-top: 1.2rem; display: flex; align-items: center; gap: .7rem; }
.testi-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  display: grid; place-items: center; color: #fff; font-weight: 700; font-size: .85rem;
}
.testi-name { font-weight: 600; color: var(--ink); font-size: .92rem; }
.testi-role { font-size: .78rem; color: var(--ink-mute); }
.demo-flag {
  font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  color: var(--accent-2); margin-top: .6rem; display: block;
}

/* --- FAQ --- */
.faq-list { max-width: 760px; margin-inline: auto; display: flex; flex-direction: column; gap: .9rem; }
.faq-item { padding: 0; overflow: hidden; }
.faq-q {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1.3rem 1.6rem;
  font-weight: 600; color: var(--ink); font-size: 1rem;
  text-align: left;
}
.faq-icon {
  flex: none; width: 26px; height: 26px; display: grid; place-items: center;
  border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  transition: transform .35s var(--ease-out);
}
.faq-item.is-open .faq-icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height .4s var(--ease-out);
  padding: 0 1.6rem;
}
.faq-a p { padding-bottom: 1.3rem; font-size: .95rem; }
.faq-item.is-open .faq-a { max-height: 220px; }

/* --- CTA final --- */
.cta-final {
  position: relative;
  border-radius: 28px;
  padding: clamp(3rem, 7vw, 5rem) clamp(2rem, 6vw, 4rem);
  background: linear-gradient(135deg, #201200 0%, #40260a 55%, #6b3d0f 100%);
  color: #fff;
  overflow: clip;
  text-align: center;
}
.cta-final::before {
  content: "";
  position: absolute; inset: -20% -10% auto -10%; height: 500px;
  background: radial-gradient(circle, rgba(245,165,36,0.5), transparent 65%);
  filter: blur(50px);
}
.cta-final h2 { color: #fff; font-size: clamp(2rem, 4.5vw, 3rem); max-width: 20ch; margin-inline: auto; position: relative; }
.cta-final p { color: rgba(255,255,255,.78); margin-top: 1rem; max-width: 48ch; margin-inline: auto; position: relative; }
.cta-final .hero-actions { justify-content: center; margin-top: 2.2rem; position: relative; }

/* --- Footer --- */
.footer { padding: 3rem 0 2.4rem; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 1.2rem;
  align-items: center; justify-content: space-between;
  padding-top: 2rem; border-top: 1px solid var(--line);
  color: var(--ink-mute); font-size: .85rem;
}
.footer-top {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2rem;
  padding-bottom: 2rem;
}
.footer-brand p { max-width: 34ch; margin-top: .9rem; font-size: .92rem; }
.footer-links { display: flex; gap: 3rem; flex-wrap: wrap; }
.footer-col h4 { font-size: .82rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-mute); margin-bottom: .9rem; }
.footer-col a { display: block; font-size: .92rem; color: var(--ink-soft); margin-bottom: .6rem; }
.footer-col a:hover { color: var(--ink); }

/* =============================================================
   7. Effects
   ============================================================= */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease-out), transform .8s var(--ease-out); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-split] { opacity: 1; transform: none; }

.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }
.reveal-delay-4 { transition-delay: .32s; }

[data-tilt] { transition: transform .3s var(--ease-out); transform-style: preserve-3d; }

.sun-orbit {
  animation: sunOrbit 16s linear infinite;
  transform-origin: center;
}
@keyframes sunOrbit { to { transform: rotate(360deg); } }

.float-bob { animation: floatBob 6s ease-in-out infinite; }
@keyframes floatBob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* =============================================================
   8. Responsive
   ============================================================= */
@media (min-width: 540px) {
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 959px) {
  .nav-links { display: none; }
  .nav-toggle {
    display: grid; place-items: center;
    width: 42px; height: 42px; border-radius: 12px;
    background: var(--glass); border: 1px solid var(--glass-border);
    position: relative; z-index: 1;
  }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 420px; margin-inline: auto; }
  .ahorro-grid { grid-template-columns: 1fr; }
  .stats-card { position: static; }
  .instalacion-panel { grid-template-columns: 1fr; }
  .testi-grid { grid-template-columns: 1fr; }
}

@media (min-width: 720px) {
  .steps-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 960px) {
  .footer-brand { max-width: 320px; }
}

@media (min-width: 1280px) {
  .hero-float-card.fc-1 { left: -8%; }
  .hero-float-card.fc-2 { right: -6%; }
}

/* =============================================================
   9. Reduced-motion (only intrusive effects)
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  .hero-mesh { animation: none; }
  .sun-orbit { animation: none; }
  .float-bob { animation: none; }
  html { scroll-behavior: auto; }
}

/* =============================================================
   10. Calculadora de ahorro (modal)
   ============================================================= */
.calc-modal {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 1.2rem;
}
.calc-modal[hidden] { display: none; }
.calc-modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(20, 14, 4, .55);
  backdrop-filter: blur(4px);
}
.calc-modal-panel {
  position: relative;
  width: 100%; max-width: 560px;
  max-height: 88vh; overflow-y: auto;
  padding: clamp(1.6rem, 4vw, 2.6rem);
  background: rgba(255,255,255,0.96);
}
.calc-modal-close {
  position: absolute; top: 1rem; right: 1rem;
  width: 36px; height: 36px; border-radius: 999px;
  display: grid; place-items: center;
  background: var(--bg-soft); color: var(--ink-soft);
  font-size: 1rem;
}
.calc-modal-close:hover { background: var(--line); }

.calc-step h3 { font-family: "Space Grotesk", sans-serif; font-size: 1.35rem; color: var(--ink); margin: .3rem 0 .5rem; }
.calc-sub { font-size: .92rem; color: var(--ink-mute); margin-bottom: 1.3rem; }
.calc-back {
  font-size: .85rem; color: var(--ink-mute); margin-bottom: .8rem;
}
.calc-back:hover { color: var(--accent-2); }

.calc-method-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.calc-method-card {
  text-align: left;
  padding: 1.3rem 1.2rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  display: flex; flex-direction: column; gap: .3rem;
  transition: border-color .25s var(--ease-out), transform .25s var(--ease-out);
}
.calc-method-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.calc-method-icon { font-size: 1.6rem; }
.calc-method-card strong { font-family: "Space Grotesk", sans-serif; color: var(--ink); }
.calc-method-card span:last-child { font-size: .85rem; color: var(--ink-mute); }

.calc-drop {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: .4rem;
  padding: 2.2rem 1.2rem;
  border: 1.5px dashed var(--line);
  border-radius: 16px;
  cursor: pointer;
  transition: border-color .25s var(--ease-out), background .25s var(--ease-out);
}
.calc-drop:hover, .calc-drop.is-drag { border-color: var(--accent); background: var(--accent-soft); }
.calc-drop-icon { font-size: 1.8rem; }
.calc-drop-text { font-weight: 600; color: var(--ink); }
.calc-drop-hint { font-size: .8rem; color: var(--ink-mute); }

.calc-form { display: flex; flex-direction: column; gap: .9rem; }
.calc-field { display: flex; flex-direction: column; gap: .35rem; font-size: .85rem; color: var(--ink-soft); }
.calc-field input, .calc-field select {
  padding: .8rem .95rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit; color: var(--ink);
}
.calc-field input:focus, .calc-field select:focus { outline: none; border-color: var(--accent-2); }
.calc-consent { display: flex; align-items: flex-start; gap: .55rem; font-size: .82rem; color: var(--ink-mute); }
.calc-consent input { margin-top: .2rem; }

.calc-error { color: #c0392b; font-size: .85rem; margin-top: .8rem; }
.calc-loading { color: var(--ink-mute); font-size: .85rem; margin-top: .8rem; }

.calc-result-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: .8rem;
  margin-bottom: 1.2rem;
}
.calc-result-item {
  padding: 1rem 1.1rem;
  border-radius: 14px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
}
.calc-result-value {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.3rem; font-weight: 700; color: var(--ink);
}
.calc-result-label { font-size: .78rem; color: var(--ink-mute); }
.calc-result-source { margin-bottom: .9rem; color: var(--accent-2); font-weight: 600; }
.calc-disclaimer { font-size: .78rem; color: var(--ink-mute); margin-bottom: 1.5rem; }

.calc-lead {
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}
.calc-lead h4 { font-family: "Space Grotesk", sans-serif; font-size: 1.05rem; color: var(--ink); margin-bottom: .3rem; }
.calc-lead > p { font-size: .88rem; color: var(--ink-mute); margin-bottom: 1rem; }
.calc-lead-ok { color: #1a7f4e; font-weight: 600; font-size: .92rem; }

@media (max-width: 640px) {
  .calc-method-grid { grid-template-columns: 1fr; }
  .calc-result-grid { grid-template-columns: 1fr 1fr; }
}