/* =========================================================
   Voltbike · Propuesta comercial
   Estética: limpia, confiada, mucho whitespace.
   Paleta: neutros + un acento eléctrico.
   ========================================================= */

/* -------- Custom properties -------- */
:root {
  /* Color */
  --ink:        #0B0F1A;
  --ink-2:      #1A2030;
  --muted:      #5A6275;
  --muted-2:    #8A92A6;
  --line:       #E5E7EE;
  --bg:         #FBFBF9;
  --bg-tint:    #F4F4F0;
  --bg-dark:    #0B0F1A;
  --bg-dark-2:  #141926;

  /* Accent: electric lime — energía "voltaje" */
  --accent:     #C6FF3D;
  --accent-2:   #B6FE3E;
  --accent-ink: #0B0F1A;

  /* Type scale */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body:    "Inter", system-ui, sans-serif;

  --fs-eyebrow: 0.78rem;
  --fs-body:    1.0625rem;
  --fs-body-lg: 1.1875rem;
  --fs-h2:      clamp(2rem, 4.5vw, 3.25rem);
  --fs-display: clamp(2.5rem, 6.8vw, 5.5rem);

  --lh-tight:   1.05;
  --lh-snug:    1.2;
  --lh-normal:  1.55;

  /* Space */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* Layout */
  --max-w: 1180px;
  --max-w-narrow: 760px;
  --radius: 14px;
  --radius-lg: 22px;

  /* Easing */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* -------- Reset -------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p, ul { margin: 0; padding: 0; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }

/* -------- Scroll progress -------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: transparent;
  z-index: 50;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.08s linear;
}

/* -------- Layout primitives -------- */
.section {
  padding: var(--space-10) var(--space-5);
  position: relative;
}
.section--hero { padding-top: var(--space-9); padding-bottom: var(--space-9); min-height: 100vh; display: flex; align-items: center; }
.section--light { background: var(--bg); color: var(--ink); }
.section--tinted { background: var(--bg-tint); }
.section--dark {
  background: var(--bg-dark);
  color: #F4F5F8;
  position: relative;
  overflow: hidden;
}
.section--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(1100px 600px at 80% 0%, rgba(198, 255, 61, 0.06), transparent 60%);
  pointer-events: none;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.container--narrow { max-width: var(--max-w-narrow); }

/* -------- Type -------- */
.eyebrow {
  font-family: var(--font-body);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-5);
}
.eyebrow--light { color: var(--accent); }

.display {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  line-height: var(--lh-tight);
  letter-spacing: -0.025em;
  font-weight: 500;
  margin-bottom: var(--space-6);
  max-width: 18ch;
}
.display__accent {
  color: var(--accent);
  font-weight: 500;
}

.h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: var(--lh-snug);
  letter-spacing: -0.02em;
  font-weight: 500;
  margin-bottom: var(--space-5);
  max-width: 22ch;
}
.h2--light { color: #F4F5F8; }

.lede {
  font-size: var(--fs-body-lg);
  line-height: 1.5;
  color: var(--muted);
  max-width: 60ch;
}
.lede--light { color: #B6BEC9; }

.body {
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--ink-2);
  max-width: 60ch;
}
.body--center { margin-left: auto; margin-right: auto; text-align: center; }
.body--lg { font-size: var(--fs-body-lg); }

.callout {
  margin-top: var(--space-7);
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
  background: #fff;
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  max-width: 60ch;
}

/* -------- Hero -------- */
.section--hero {
  background: var(--bg-dark);
  position: relative;
}
.section--hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 500px at 15% 20%, rgba(198, 255, 61, 0.10), transparent 55%),
    radial-gradient(700px 400px at 90% 80%, rgba(198, 255, 61, 0.04), transparent 60%);
  pointer-events: none;
}
.hero__scroll {
  margin-top: var(--space-9);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--muted-2);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.hero__scroll svg {
  width: 16px;
  height: 16px;
  animation: bounce 2.2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50%      { transform: translateY(6px); opacity: 1; }
}

/* -------- Solution cards -------- */
.solution__intro { text-align: center; max-width: 760px; margin: 0 auto var(--space-8); }
.solution__intro .eyebrow { display: inline-block; }
.solution__intro .h2 { margin-left: auto; margin-right: auto; }

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}
.card {
  padding: var(--space-7);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: #D6DAE3;
  box-shadow: 0 18px 40px -20px rgba(11, 15, 26, 0.18);
}
.card__icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  margin-bottom: var(--space-5);
}
.card__icon svg { width: 24px; height: 24px; }
.card__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}
.card__sub { color: var(--muted); font-size: 0.98rem; }

/* -------- Feature checklist -------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-9);
  align-items: start;
}
.feature__head { position: sticky; top: 80px; }
.checklist { display: flex; flex-direction: column; gap: var(--space-5); }
.checklist li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-body-lg);
  line-height: 1.45;
  color: var(--ink-2);
}
.checklist li:last-child { border-bottom: none; }
.checklist__icon {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  flex-shrink: 0;
  margin-top: 2px;
}
.checklist__icon svg { width: 16px; height: 16px; }

/* -------- Timeline -------- */
.timeline__head { text-align: center; max-width: 720px; margin: 0 auto var(--space-8); }
.timeline__head .h2 { margin-left: auto; margin-right: auto; }
.timeline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-7);
}
.phase {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--space-5);
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  position: relative;
}
.phase__marker { display: flex; justify-content: center; padding-top: 6px; }
.phase__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(198, 255, 61, 0.2);
  display: inline-block;
  flex-shrink: 0;
}
.phase__tag {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-3);
}
.phase__title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin-bottom: var(--space-4);
}

/* -------- Guarantee -------- */
.section--guarantee { background: var(--bg-tint); }
.guarantee { text-align: center; }
.guarantee__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-5);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
}
.guarantee__icon svg { width: 32px; height: 32px; }
.guarantee .eyebrow { display: inline-block; }
.guarantee .h2 { margin-left: auto; margin-right: auto; }
.guarantee .body { margin-left: auto; margin-right: auto; }

/* -------- Investment -------- */
.invest__head { text-align: center; max-width: 720px; margin: 0 auto var(--space-8); }
.invest__head .h2 { margin-left: auto; margin-right: auto; }
.invest__head .eyebrow { display: inline-block; }

.invest {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}
.invest__card {
  padding: var(--space-7);
  background: var(--bg-dark-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}
.invest__card:hover {
  border-color: rgba(198, 255, 61, 0.3);
  transform: translateY(-3px);
}
.invest__label {
  color: #B6BEC9;
  font-size: 0.95rem;
  margin-bottom: var(--space-4);
}
.invest__price {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1;
  color: #F4F5F8;
  margin-bottom: var(--space-4);
}
.invest__num { color: var(--accent); }
.invest__per { font-size: 0.5em; color: #B6BEC9; margin-left: 0.15em; font-weight: 400; }
.invest__sub { color: #8A92A6; font-size: 0.95rem; line-height: 1.5; }

/* -------- Closing -------- */
.section--close { padding-bottom: var(--space-10); }
.signature {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--line);
}
.signature__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: var(--space-2);
}
.signature__contact {
  color: var(--muted);
  font-size: 0.95rem;
}

/* =========================================================
   Scroll-reveal animation
   ========================================================= */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.85s var(--ease), transform 0.85s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* Stagger children */
.checklist li[data-reveal] { transition-delay: 0.05s; }
.checklist li[data-reveal]:nth-child(2) { transition-delay: 0.1s; }
.checklist li[data-reveal]:nth-child(3) { transition-delay: 0.15s; }
.checklist li[data-reveal]:nth-child(4) { transition-delay: 0.2s; }
.checklist li[data-reveal]:nth-child(5) { transition-delay: 0.25s; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .hero__scroll svg { animation: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px) {
  :root {
    --space-10: 5rem;
    --space-9:  4rem;
    --space-8:  3rem;
  }
  .section { padding: var(--space-9) var(--space-5); }
  .section--hero { min-height: auto; padding-top: var(--space-10); padding-bottom: var(--space-10); }

  .cards { grid-template-columns: 1fr; }
  .invest { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }

  .feature {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .feature__head { position: static; }
}

@media (max-width: 560px) {
  :root {
    --fs-body:    1rem;
    --fs-body-lg: 1.05rem;
  }
  .section { padding: var(--space-8) var(--space-4); }
  .card { padding: var(--space-6); }
  .invest__card { padding: var(--space-6); }
  .phase { padding: var(--space-5); }
  .callout { padding: var(--space-4) var(--space-5); font-size: 1rem; }
}

/* Selection */
::selection {
  background: var(--accent);
  color: var(--accent-ink);
}