/* =========================================================
   LMS STUDIO — LANDING CORPORATIVA
   CSS vanilla · variables centrales en :root · sin frameworks
   ========================================================= */

/* ---------- RESET & BASE ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* ---------- VARIABLES ---------- */
:root {
  /* superficies oscuras (no todo negro puro) */
  --bg-0: #08090B;
  --bg-1: #101216;
  --bg-2: #171A20;
  --bg-3: #20242B;

  /* zonas claras */
  --light-0: #F5F7FA;
  --light-1: #E8EBEF;
  --light-2: #C8CDD5;

  /* tinta */
  --ink: #F5F7FA;
  --ink-dim: #B7BEC9;
  --ink-faint: #7C8493;

  /* tinta sobre zona clara */
  --ink-on-light: #14171C;
  --ink-on-light-dim: #4B5261;
  --ink-on-light-faint: #7A8090;

  /* acento — uso puntual, nunca atmósfera */
  --blue: #1683FF;
  --blue-dim: rgba(22, 131, 255, 0.14);

  --line: rgba(245, 247, 250, 0.10);
  --line-strong: rgba(245, 247, 250, 0.20);
  --line-on-light: rgba(20, 23, 28, 0.12);
  --line-on-light-strong: rgba(20, 23, 28, 0.22);

  --mono: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: 'Geist', -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;

  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 48px);
  --radius: 3px;

  --ease: cubic-bezier(.16, .84, .44, 1);
  --dur-fast: 220ms;
  --dur: 400ms;
}

body {
  background: var(--bg-0);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

::selection { background: var(--blue); color: #fff; }

/* foco visible siempre — accesibilidad no negociable */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- TIPOGRAFÍA ---------- */
h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.section-light h1, .section-light h2, .section-light h3, .section-light h4 { color: var(--ink-on-light); }

h2 { font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3.2rem); max-width: 18ch; }
h3 { font-size: clamp(1.2rem, 1rem + 1vw, 1.6rem); font-weight: 700; letter-spacing: -0.01em; }

p { color: var(--ink-dim); max-width: 62ch; }
.section-light p { color: var(--ink-on-light-dim); }

.lede { font-size: clamp(1.02rem, 0.94rem + 0.4vw, 1.2rem); color: var(--ink-dim); max-width: 58ch; line-height: 1.65; margin-top: 20px; }
.section-light .lede { color: var(--ink-on-light-dim); }

.accent { color: var(--blue); }

.kicker {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 24px;
}
.kicker::before { content: ""; width: 24px; height: 1px; background: var(--blue); flex-shrink: 0; }
.kicker .n { color: var(--ink-faint); font-weight: 400; }
.section-light .kicker .n { color: var(--ink-on-light-faint); }

/* ---------- LAYOUT / SECCIONES ---------- */
section {
  position: relative;
  padding: clamp(64px, 11vw, 128px) 0;
  border-bottom: 1px solid var(--line);
}
.section-light { background: var(--light-0); border-bottom: 1px solid var(--line-on-light); }
.section-light + .section-light { border-top: none; }

.two-col { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: clamp(32px, 6vw, 90px); align-items: start; }
.stack > * + * { margin-top: 18px; }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }

/* ---------- BOTONES ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--sans); font-weight: 600; font-size: 0.95rem;
  padding: 15px 26px; border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: #3a97ff; }
.btn-secondary { border-color: var(--line-strong); color: var(--ink); }
.btn-secondary:hover { border-color: var(--blue); }
.section-light .btn-secondary { border-color: var(--line-on-light-strong); color: var(--ink-on-light); }
.section-light .btn-secondary:hover { border-color: var(--blue); }
.btn:active { transform: scale(0.97); }
@media (prefers-reduced-motion: reduce) { .btn { transition: none; } .btn:active { transform: none; } }

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* =========================================================
   HEADER / NAV
   ========================================================= */
.site-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 900;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--gutter);
  background: rgba(8, 9, 11, 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { height: 27px; width: auto; display: block; }
.brand-word { font-family: var(--sans); font-weight: 800; font-size: 0.95rem; letter-spacing: 0.02em; }
.brand-word small { display: block; font-weight: 400; font-size: 0.58rem; letter-spacing: 0.32em; color: var(--ink-faint); margin-top: 1px; }

.nav-links {
  display: flex; align-items: center; gap: 34px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-dim);
}
.nav-links a { transition: color var(--dur-fast) var(--ease); }
.nav-links a:hover { color: var(--ink); }
.nav-links .btn { font-family: var(--sans); text-transform: none; letter-spacing: normal; padding: 11px 20px; font-size: 0.88rem; }

.nav-toggle { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle::before, .nav-toggle::after { content: ""; display: block; width: 20px; height: 1.5px; background: var(--ink); position: relative; transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease); }
.nav-toggle::before { position: absolute; transform: translateY(-6px); }
.nav-toggle::after { position: absolute; transform: translateY(6px); }
.nav-toggle[aria-expanded="true"] span { opacity: 0; }
.nav-toggle[aria-expanded="true"]::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"]::after { transform: rotate(-45deg); }

@media (max-width: 860px) {
  .nav-links {
    position: fixed; top: 0; right: 0; height: 100vh; width: min(78vw, 340px);
    background: var(--bg-1); border-left: 1px solid var(--line);
    flex-direction: column; align-items: flex-start; justify-content: center;
    gap: 28px; padding: 0 40px;
    transform: translateX(100%); transition: transform var(--dur) var(--ease);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-toggle { display: flex; }
}

/* =========================================================
   HERO + RUNWAY 3D
   ========================================================= */
.hero-runway { border-bottom: none; padding: 0; height: 240vh; }
.runway-sticky {
  position: sticky; top: 0; height: 100vh; width: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: clamp(14px, 2.6vh, 30px);
  /* padding-top despeja el header fixed (~76px); nunca queda contenido debajo */
  padding: clamp(88px, 13vh, 112px) var(--gutter) clamp(28px, 6vh, 48px);
  overflow: hidden; perspective: 1400px;
}

.runway-scene {
  position: relative; width: 100%; max-width: 640px;
  height: clamp(84px, 17vh, 190px); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transform-style: preserve-3d;
}
.logo-3d {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d; transform: rotateY(0deg); will-change: transform;
}
.logo-layer {
  position: absolute; inset: 0; transform-style: preserve-3d;
  display: flex; justify-content: center; align-items: center;
  backface-visibility: hidden;
}
.logo-layer:nth-child(1) { transform: translateZ(-10px); opacity: 0.12; filter: blur(1px); }
.logo-layer:nth-child(2) { transform: translateZ(-7.5px); opacity: 0.24; }
.logo-layer:nth-child(3) { transform: translateZ(-5px); opacity: 0.42; }
.logo-layer:nth-child(4) { transform: translateZ(-2.5px); opacity: 0.65; }
.logo-layer:nth-child(5) { transform: translateZ(0); opacity: 1; filter: drop-shadow(0 18px 34px rgba(0, 0, 0, 0.55)); }

.runway-copy {
  position: relative; flex-shrink: 0;
  text-align: center; max-width: 720px; padding: 0 var(--gutter);
  /* visible desde el primer frame: no depende de que el usuario scrollee */
  opacity: 1; transform: none;
  animation: heroIn 700ms var(--ease) both;
}
.runway-copy .kicker { justify-content: center; margin-bottom: clamp(12px, 2vh, 24px); }
.runway-copy h1 { font-size: clamp(1.7rem, 1.1rem + 2.8vw, 3.2rem); max-width: 18ch; margin: 0 auto; }
.runway-copy h1 em { font-style: normal; color: var(--blue); }
.runway-copy .lede { margin: clamp(12px, 2vh, 22px) auto 0; text-align: center; }
.runway-copy .btn-row { justify-content: center; margin-top: clamp(20px, 3vh, 40px); }

@keyframes heroIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.runway-meta {
  position: relative; flex-shrink: 0; width: 100%;
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 30px;
  padding: 0 var(--gutter);
  font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-faint);
  /* visible desde el primer frame, igual que el copy */
  opacity: 1;
}
.runway-meta strong { display: block; font-family: var(--sans); font-size: 13.5px; color: var(--ink); text-transform: none; letter-spacing: 0; margin-top: 4px; font-weight: 600; }

.scroll-hint {
  position: absolute; bottom: clamp(14px, 3vh, 28px); left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--ink-faint); animation: pulse 2s infinite ease-in-out; transition: opacity var(--dur) var(--ease);
}
@keyframes pulse { 0%, 100% { opacity: 0.35; transform: translate(-50%, 0); } 50% { opacity: 0.8; transform: translate(-50%, 4px); } }

@media (max-width: 640px) {
  .hero-runway { height: 190vh; }
  .runway-scene { max-width: 320px; }
  .runway-meta { display: none; }
}

/* laptops con poca altura de viewport (13"-14" con barra del navegador visible):
   se prioriza que nada se solape — se oculta la fila de meta y se compacta todo. */
@media (max-height: 760px) {
  .runway-sticky { gap: clamp(10px, 1.8vh, 18px); padding-top: clamp(80px, 11vh, 96px); }
  .runway-scene { height: clamp(70px, 14vh, 130px); }
  .runway-meta { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-runway { height: auto; }
  .runway-sticky { position: relative; height: auto; padding: 130px var(--gutter) 60px; }
  .logo-3d { transform: rotateY(0deg) !important; }
  .runway-copy { opacity: 1; transform: none; animation: none; }
  .runway-meta { opacity: 1; margin-top: 8px; }
  .scroll-hint { display: none; }
}

/* =========================================================
   OBJECIONES / PROBLEMA
   ========================================================= */
.problem-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 56px; }
.problem-card { background: var(--bg-0); padding: 30px 28px; }
.problem-card .tag {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-faint);
  margin-bottom: 12px; display: block;
}
.problem-card p { color: var(--ink); font-size: 1.02rem; max-width: none; }

/* =========================================================
   DIFERENCIACIÓN
   ========================================================= */
.diff-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 56px; }
.diff-card { background: var(--bg-0); padding: 32px 26px; display: flex; flex-direction: column; gap: 16px; }
.diff-card h3 { color: var(--ink); }
.diff-card p { font-size: 0.94rem; }
.diff-card .quote { font-size: 0.94rem; color: var(--ink); border-left: 2px solid var(--blue); padding-left: 14px; font-style: normal; }

/* =========================================================
   CASO ALTA GROUP
   ========================================================= */
.case-frame {
  margin-top: 56px; border: 1px solid var(--line-strong); border-radius: 2px; overflow: hidden; background: var(--bg-2);
}
.case-frame .chrome { display: flex; gap: 7px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.case-frame .chrome span { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); }
.case-frame .chrome b { margin-left: 8px; font-family: var(--mono); font-size: 11px; color: var(--ink-faint); font-weight: 400; }
.case-frame-img { width: 100%; height: auto; display: block; border-bottom: 1px solid var(--line); }
.case-frame-body { padding: 34px clamp(22px, 4vw, 44px); display: flex; flex-direction: column; gap: 20px; }
.case-frame-body p { font-family: var(--mono); font-size: 0.92rem; color: var(--ink-dim); line-height: 1.75; max-width: none; }

.case-numbers { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 40px; }
.case-numbers div { background: var(--bg-0); padding: 26px 20px; }
.case-numbers .big { font-size: clamp(1.9rem, 3vw, 2.6rem); font-weight: 800; color: var(--ink); letter-spacing: -0.02em; }
.case-numbers .cap { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); margin-top: 8px; }

.case-honesty {
  margin-top: 30px; padding: 20px 24px; border: 1px dashed var(--line-strong); border-radius: 3px;
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint); line-height: 1.7;
}
.case-honesty b { color: var(--ink-dim); }

.case-decisions { margin-top: 50px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; }
.case-decision { border-top: 1px solid var(--line); padding-top: 20px; }
.case-decision .num { font-family: var(--mono); font-size: 12px; color: var(--blue); margin-bottom: 8px; display: block; }
.case-decision p { font-size: 0.92rem; }

/* =========================================================
   PROCESO
   ========================================================= */
.process-list { margin-top: 56px; }
.process-row {
  display: grid; grid-template-columns: 90px minmax(0, 1fr); gap: 24px; padding: 26px 0; border-top: 1px solid var(--line); align-items: start;
}
.process-row:last-child { border-bottom: 1px solid var(--line); }
.process-row .step-n { font-family: var(--mono); font-size: 13px; color: var(--blue); padding-top: 3px; }
.process-row h3 { font-size: 1.05rem; }
.process-row p { font-size: 0.92rem; margin-top: 6px; }

/* =========================================================
   FAQ
   ========================================================= */
.faq-list { margin-top: 48px; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  padding: 22px 4px; cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  font-weight: 600; font-size: 1rem; color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-family: var(--mono); font-size: 1.3rem; color: var(--blue); flex-shrink: 0;
  transition: transform var(--dur) var(--ease);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 4px 24px; font-size: 0.95rem; max-width: 68ch; }

/* =========================================================
   CONTACTO
   ========================================================= */
.contact-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(32px, 6vw, 80px); margin-top: 56px; align-items: start; }
.contact-direct { display: flex; flex-direction: column; gap: 18px; }
.contact-direct a {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--mono); font-size: 0.95rem; color: var(--ink);
  padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius);
  transition: border-color var(--dur-fast) var(--ease);
}
.contact-direct a:hover { border-color: var(--blue); }
.contact-direct svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--blue); }

.form-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field label { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); }
.field input, .field select, .field textarea {
  background: var(--bg-2); border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 13px 14px; color: var(--ink); font-size: 0.95rem;
  transition: border-color var(--dur-fast) var(--ease);
}
.field textarea { resize: vertical; min-height: 100px; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); outline: none; }
.field input:invalid:not(:placeholder-shown), .field textarea:invalid:not(:placeholder-shown) { border-color: #e05252; }
.field-note { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); margin-top: 14px; }
.form-status { margin-top: 14px; font-family: var(--mono); font-size: 12.5px; color: var(--blue); min-height: 1.2em; }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer { border-bottom: none; padding: 48px 0 40px; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { height: 20px; width: auto; display: block; }
.footer-brand span { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 26px; font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }
.footer-links a:hover { color: var(--ink); }
.footer-note { margin-top: 24px; font-family: var(--mono); font-size: 11px; color: var(--ink-faint); max-width: 70ch; }

/* =========================================================
   PLANES
   ========================================================= */
.plans-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line-on-light); border: 1px solid var(--line-on-light); margin-top: 48px; }
.plan-card { background: var(--light-0); padding: 34px 28px; display: flex; flex-direction: column; }
.plan-card.plan-featured { background: var(--bg-0); }
.plan-tag {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--blue);
  margin-bottom: 10px;
}
.plan-name { font-family: var(--sans); font-weight: 700; font-size: 1.1rem; color: var(--ink-on-light); }
.plan-featured .plan-name { color: var(--ink); }
.plan-price { font-family: var(--sans); font-weight: 800; font-size: 1.9rem; color: var(--ink-on-light); margin-top: 8px; letter-spacing: -0.01em; }
.plan-featured .plan-price { color: var(--ink); }
.plan-price span { font-size: 0.95rem; font-weight: 500; color: var(--ink-on-light-faint); }
.plan-featured .plan-price span { color: var(--ink-faint); }
.plan-for { font-size: 0.92rem; color: var(--ink-on-light-dim); margin-top: 10px; max-width: none; }
.plan-featured .plan-for { color: var(--ink-dim); }
.plan-features { list-style: none; margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--line-on-light); display: flex; flex-direction: column; gap: 11px; }
.plan-featured .plan-features { border-top-color: var(--line); }
.plan-features li { font-family: var(--mono); font-size: 0.84rem; color: var(--ink-on-light-dim); padding-left: 18px; position: relative; }
.plan-featured .plan-features li { color: var(--ink-dim); }
.plan-features li::before { content: '—'; position: absolute; left: 0; color: var(--ink-on-light-faint); }
.plan-featured .plan-features li::before { color: var(--ink-faint); }
.plans-note { margin-top: 22px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-on-light-faint); max-width: 72ch; }

/* =========================================================
   REVEAL ON SCROLL
   ========================================================= */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 920px) {
  .two-col { grid-template-columns: 1fr; }
  .problem-grid, .diff-grid, .case-decisions { grid-template-columns: 1fr; }
  .case-numbers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .plans-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  section { padding: 72px 0; }
}

@media (max-width: 560px) {
  .case-numbers { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .runway-meta { gap: 14px 22px; }
}