/* ==========================================================================
   Berti — landing de venta (chat.bertium.net)
   Sistema visual Bertium. Mobile-first. Una sola pieza audaz: la conversación.
   ========================================================================== */

:root {
  --canvas: #F6F7F9;
  --surface: #FFFFFF;
  --surface-tint: #F0F3F6;
  --ink: #122A45;
  --navy-deep: #0B1F33;
  --slate: #5C7086;
  --slate-soft: #8496A8;
  --mist: #DCE3EA;
  --mist-soft: #E8EDF2;
  --amber: #EE9A33;
  --amber-dark: #D98620;
  --amber-tint: #FCEEDC;
  --btn-ink: #3A2205;
  --sage: #4C8B6E;
  --sage-tint: #E7F1EC;

  --font-sans: "Figtree", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Sora", "Figtree", ui-sans-serif, system-ui, sans-serif;

  --radius-card: 16px;
  --radius-btn: 11px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(18, 42, 69, .06);
  --shadow-md: 0 18px 40px -22px rgba(18, 42, 69, .28);

  --wrap: 1140px;
  --gutter: 20px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--slate);
  background: var(--canvas);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { font-family: var(--font-display); color: var(--ink); line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; }
h1 { font-size: clamp(2rem, 5.2vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.35rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; letter-spacing: -.01em; }
p { margin: 0 0 1rem; }
a { color: inherit; }

img { max-width: 100%; display: block; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }

::selection { background: var(--amber-tint); color: var(--btn-ink); }
:focus-visible { outline: 2px solid var(--amber-dark); outline-offset: 2px; border-radius: 4px; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ---- Botones ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font-family: var(--font-sans); font-weight: 600; font-size: .98rem;
  padding: .8rem 1.25rem; border-radius: var(--radius-btn);
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .12s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--amber); color: var(--btn-ink); }
.btn-primary:hover { background: var(--amber-dark); }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--mist); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-sm { padding: .55rem .95rem; font-size: .9rem; }
.btn-lg { padding: .95rem 1.5rem; font-size: 1.03rem; }
.btn-block { width: 100%; }

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246, 247, 249, .86);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--mist);
}
.header-inner { display: flex; align-items: center; gap: 1.5rem; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: .5rem; text-decoration: none; }
.brand img { height: 30px; width: auto; }
.brand-x { color: var(--slate-soft); font-weight: 400; }
.brand-berti { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-size: 1.15rem; }
.nav { display: none; gap: 1.6rem; margin-left: auto; }
.nav a { text-decoration: none; color: var(--slate); font-weight: 500; font-size: .95rem; }
.nav a:hover { color: var(--ink); }
.header-actions { display: none; gap: .6rem; }
.nav-toggle {
  margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--mist);
  background: var(--surface); border-radius: var(--radius-btn); display: grid; place-content: center; gap: 4px; cursor: pointer;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px; }
.mobile-nav {
  display: flex; flex-direction: column; gap: .35rem; padding: 1rem var(--gutter) 1.4rem;
  border-top: 1px solid var(--mist); background: var(--surface);
}
.mobile-nav a { text-decoration: none; color: var(--ink); font-weight: 500; padding: .7rem .25rem; }
.mobile-nav a:not(.btn) { border-bottom: 1px solid var(--mist-soft); }
.mobile-nav .btn { margin-top: .6rem; }
.mobile-nav[hidden] { display: none; }

@media (min-width: 900px) {
  .nav { display: flex; }
  .header-actions { display: flex; }
  .nav-toggle, .mobile-nav { display: none !important; }
}

/* ---- Hero ---- */
.hero { padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(3rem, 6vw, 5rem); }
.hero-grid { display: grid; gap: 2.5rem; align-items: center; }
.hero-copy h1 { max-width: 15ch; }
.lead { font-size: clamp(1.05rem, 2.2vw, 1.28rem); color: var(--slate); max-width: 46ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.6rem 0 1rem; }
.hero-note { font-size: .9rem; color: var(--slate-soft); margin: 0; }

@media (min-width: 900px) {
  .hero-grid { grid-template-columns: 1.05fr .95fr; gap: 3.5rem; }
}

/* ---- Phone / conversación (pieza central) ---- */
.hero-demo { display: flex; flex-direction: column; align-items: center; gap: .9rem; }
.phone {
  width: 100%; max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--mist);
  border-radius: 26px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.phone-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .8rem 1rem; background: var(--navy-deep); color: #fff; }
.phone-contact { display: flex; align-items: center; gap: .65rem; }
.phone-contact strong { color: #fff; font-family: var(--font-display); font-size: .98rem; display: block; line-height: 1.1; }
.avatar {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-content: center;
  background: var(--amber); color: var(--btn-ink); font-weight: 700; font-family: var(--font-display);
}
.phone-status { font-size: .72rem; color: #B7C6D6; display: inline-flex; align-items: center; gap: .35rem; }
.phone-status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #67D99B; }
.phone-clock { font-variant-numeric: tabular-nums; font-size: .82rem; color: #B7C6D6; }

.thread { padding: 1.1rem 1rem; min-height: 300px; display: flex; flex-direction: column; gap: .6rem; background: var(--surface-tint); }
.bubble {
  max-width: 82%; padding: .6rem .8rem; border-radius: 14px; font-size: .9rem; line-height: 1.45;
  opacity: 0; transform: translateY(8px); transition: opacity .45s ease, transform .45s ease;
}
.bubble.show { opacity: 1; transform: none; }
.bubble.in { align-self: flex-start; background: var(--surface); border: 1px solid var(--mist); border-bottom-left-radius: 4px; color: var(--ink); }
.bubble.out { align-self: flex-end; background: var(--amber-tint); border: 1px solid #F2D9B0; border-bottom-right-radius: 4px; color: var(--btn-ink); }
.bubble time { display: block; font-size: .68rem; color: var(--slate-soft); margin-top: .3rem; text-align: right; font-variant-numeric: tabular-nums; }
.bubble.out time { color: #A9803A; }
.typing { align-self: flex-start; display: inline-flex; gap: 4px; padding: .7rem .85rem; background: var(--surface); border: 1px solid var(--mist); border-radius: 14px; border-bottom-left-radius: 4px; }
.typing span { width: 6px; height: 6px; border-radius: 50%; background: var(--slate-soft); animation: blink 1.2s infinite ease-in-out; }
.typing span:nth-child(2) { animation-delay: .18s; }
.typing span:nth-child(3) { animation-delay: .36s; }
@keyframes blink { 0%, 60%, 100% { opacity: .25; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-2px); } }

.phone-input { display: flex; align-items: center; padding: .8rem 1rem; border-top: 1px solid var(--mist); color: var(--slate-soft); font-size: .88rem; background: var(--surface); }
.demo-tag { font-size: .78rem; color: var(--slate-soft); }

/* ---- Secciones ---- */
section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.section-lead { font-size: 1.08rem; max-width: 60ch; margin-bottom: 2rem; }

.problem h2 { max-width: 22ch; }
.compare { display: grid; gap: 1.25rem; margin-top: 2rem; }
.compare-col { background: var(--surface); border: 1px solid var(--mist); border-radius: var(--radius-card); padding: 1.5rem; }
.compare-col h3 { display: flex; align-items: center; gap: .5rem; }
.compare-col h3::before { content: ""; width: 10px; height: 10px; border-radius: 50%; }
.is-bad h3::before { background: #C4645A; }
.is-good h3::before { background: var(--sage); }
.compare-col ul { margin: 0; padding: 0; list-style: none; }
.compare-col li { position: relative; padding-left: 1.4rem; margin-bottom: .7rem; }
.compare-col li::before { content: ""; position: absolute; left: 0; top: .62em; width: 12px; height: 2px; background: var(--mist); }
.is-good { border-color: var(--sage); }
.is-good li::before { background: var(--sage); }
@media (min-width: 800px) { .compare { grid-template-columns: 1fr 1fr; } }

/* ---- Pasos ---- */
.steps { list-style: none; margin: 2rem 0 0; padding: 0; display: grid; gap: 1.25rem; counter-reset: none; }
.steps li { background: var(--surface); border: 1px solid var(--mist); border-radius: var(--radius-card); padding: 1.5rem 1.5rem 1.4rem; }
.step-n {
  display: grid; place-content: center; width: 34px; height: 34px; border-radius: 10px;
  background: var(--ink); color: #fff; font-family: var(--font-display); font-weight: 600; margin-bottom: .9rem;
}
.steps h3 { margin-bottom: .35rem; }
.steps p { margin: 0; font-size: .96rem; }
@media (min-width: 700px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1040px) { .steps { grid-template-columns: repeat(4, 1fr); } }

/* ---- Casos (tabs) ---- */
.tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.5rem 0 1.5rem; }
.tab {
  font-family: var(--font-sans); font-weight: 600; font-size: .92rem; color: var(--slate);
  background: var(--surface); border: 1px solid var(--mist); border-radius: var(--radius-pill);
  padding: .55rem 1rem; cursor: pointer; transition: all .18s ease;
}
.tab:hover { color: var(--ink); border-color: var(--slate-soft); }
.tab.is-active { background: var(--ink); border-color: var(--ink); color: #fff; }
.panel { background: var(--surface); border: 1px solid var(--mist); border-radius: var(--radius-card); padding: clamp(1.5rem, 3vw, 2.5rem); }
.panel[hidden] { display: none; }
.panel-kicker { text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; font-weight: 700; color: var(--amber-dark); margin: 0 0 .5rem; }
.panel h3 { font-size: clamp(1.25rem, 2.6vw, 1.7rem); max-width: 26ch; }
.panel-points { list-style: none; margin: 1.2rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: .6rem 1.4rem; }
.panel-points li { position: relative; padding-left: 1.3rem; color: var(--ink); font-weight: 500; font-size: .95rem; }
.panel-points li::before { content: ""; position: absolute; left: 0; top: .55em; width: 8px; height: 8px; border-radius: 2px; background: var(--amber); }

/* ---- Planes ---- */
.plan-grid { display: grid; gap: 1.25rem; margin-top: 2rem; align-items: start; }
.plan { position: relative; background: var(--surface); border: 1px solid var(--mist); border-radius: var(--radius-card); padding: 1.75rem 1.5rem; display: flex; flex-direction: column; }
.plan-featured { border-color: var(--ink); box-shadow: var(--shadow-md); }
.plan-badge { position: absolute; top: -0.75rem; left: 1.5rem; background: var(--amber); color: var(--btn-ink); font-size: .75rem; font-weight: 700; padding: .25rem .7rem; border-radius: var(--radius-pill); }
.plan-sub { font-size: .92rem; margin: 0 0 1.1rem; min-height: 2.6em; }
.plan-price { display: flex; align-items: baseline; gap: .5rem; margin: 0; }
.plan-price.alt { margin-top: .15rem; }
.plan-amount { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-size: 1.9rem; letter-spacing: -.02em; }
.plan-price.alt .plan-amount { font-size: 1.2rem; color: var(--slate); }
.plan-per { font-size: .82rem; color: var(--slate-soft); }
.plan-features { list-style: none; margin: 1.3rem 0; padding: 0; display: grid; gap: .6rem; }
.plan-features li { position: relative; padding-left: 1.5rem; font-size: .95rem; }
.plan-features li::before { content: ""; position: absolute; left: 0; top: .45em; width: 10px; height: 10px; border: 2px solid var(--sage); border-radius: 50%; }
.plan .btn { margin-top: auto; }
.plans-foot { margin-top: 1.5rem; color: var(--slate-soft); font-size: .95rem; }
@media (min-width: 860px) { .plan-grid { grid-template-columns: repeat(3, 1fr); } }

/* ---- FAQ ---- */
.accordion { margin-top: 1.5rem; border-top: 1px solid var(--mist); }
.accordion details { border-bottom: 1px solid var(--mist); }
.accordion summary { cursor: pointer; padding: 1.1rem .25rem; font-weight: 600; color: var(--ink); font-family: var(--font-display); font-size: 1.02rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after { content: "+"; color: var(--amber-dark); font-size: 1.4rem; line-height: 1; }
.accordion details[open] summary::after { content: "–"; }
.accordion p { padding: 0 .25rem 1.2rem; margin: 0; max-width: 68ch; }

/* ---- Cierre ---- */
.closing { background: var(--navy-deep); color: #C9D6E4; }
.closing h2 { color: #fff; }
.closing-inner { display: grid; gap: 1.5rem; align-items: center; }
.closing-inner p { max-width: 52ch; color: #B7C6D6; }
.closing-cta { display: flex; flex-wrap: wrap; gap: .75rem; }
.closing .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.25); }
.closing .btn-ghost:hover { border-color: #fff; }
@media (min-width: 860px) { .closing-inner { grid-template-columns: 1.2fr 1fr; gap: 3rem; } }

/* ---- Footer ---- */
.site-footer { background: var(--surface); border-top: 1px solid var(--mist); padding: 3rem 0 2rem; }
.footer-inner { display: grid; gap: 1.75rem; }
.footer-brand img { height: 30px; margin-bottom: 1rem; }
.footer-brand p { max-width: 40ch; font-size: .95rem; }
.footer-nav { display: flex; flex-direction: column; gap: .6rem; }
.footer-nav a, .footer-contact a { text-decoration: none; color: var(--slate); }
.footer-nav a:hover, .footer-contact a:hover { color: var(--ink); }
.footer-contact { display: flex; flex-direction: column; gap: .6rem; }
.footer-legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem; margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--mist); font-size: .85rem; color: var(--slate-soft); }
.footer-legal a { text-decoration: none; }
.footer-legal a:hover { color: var(--ink); }
@media (min-width: 800px) { .footer-inner { grid-template-columns: 2fr 1fr 1fr; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .bubble { opacity: 1; transform: none; }
}