/* ===== Keryx — tema claro por defecto, con switch a oscuro ===== */
:root{
  --bg:#f7f8fa;
  --surface:#ffffff;
  --surface-2:#f1f3f6;
  --border:#e5e8ee;
  --text:#14171f;
  --text-dim:#565d6b;
  --text-faint:#8890a0;
  --accent:#15803d;
  --accent-2:#16a34a;
  --accent-grad:linear-gradient(135deg,#15803d 0%,#16a34a 100%);
  --carbon:#111317;
  --mod-panel:#2f6fed;
  --mod-conv:#16a34a;
  --mod-tablero:#d97706;
  --mod-ia:#7c3aed;
  --shadow:0 1px 2px rgba(20,23,31,0.04), 0 8px 24px rgba(20,23,31,0.06);
  --shadow-lg:0 20px 60px rgba(20,23,31,0.10);
  --radius-lg:24px;
  --radius-md:16px;
  --radius-sm:10px;
  --maxw:1120px;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0b0c0f;
  --surface:#15171c;
  --surface-2:#1b1e25;
  --border:#282c35;
  --text:#f2f3f5;
  --text-dim:#a3a9b7;
  --text-faint:#6b7180;
  --shadow:0 1px 2px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.35);
  --shadow-lg:0 20px 60px rgba(0,0,0,0.5);
  color-scheme:dark;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
  overflow-x:hidden;
  transition:background .25s ease, color .25s ease;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ===== Nav ===== */
.nav{
  position:sticky;top:0;z-index:100;
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom:1px solid var(--border);
}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:56px;flex-wrap:wrap;gap:8px;}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15px;letter-spacing:-0.01em;}
.brand .mark{width:22px;height:22px;border-radius:7px;display:block;flex-shrink:0;}
.nav-links{display:flex;gap:4px;font-size:13.5px;color:var(--text-dim);font-weight:500;}
.nav-links a{padding:7px 13px;border-radius:100px;transition:background .18s ease,color .18s ease;}
.nav-links a:hover{color:var(--text);background:var(--surface-2);}
.nav-right{display:flex;align-items:center;gap:14px;}
.nav-cta{font-size:13.5px;padding:8px 18px;border-radius:100px;background:var(--text);color:var(--bg);font-weight:600;white-space:nowrap;transition:transform .18s cubic-bezier(.16,1,.3,1),opacity .18s ease;}
.nav-cta:hover{transform:translateY(-1px);opacity:.88;}
.nav-cta:active{transform:scale(.96);}
.nav-menu-btn{display:none;background:none;border:0;color:var(--text);font-size:20px;}
@media (max-width:820px){
  .nav-links{display:none;}
  .nav-links.open{
    display:flex;flex-direction:column;gap:4px;position:absolute;top:56px;left:0;right:0;
    background:var(--bg);padding:16px 24px 20px;border-bottom:1px solid var(--border);
    animation:navDrop .3s cubic-bezier(.16,1,.3,1);
  }
  .nav-menu-btn{display:block;}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-8px);}to{opacity:1;transform:none;}}

/* ===== Theme switch ===== */
.theme-switch{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--surface-2);border:1px solid var(--border);
  border-radius:100px;padding:3px;position:relative;cursor:pointer;
}
.theme-switch button{
  border:0;background:transparent;color:var(--text-faint);
  width:28px;height:26px;border-radius:100px;font-size:13px;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background .2s ease,color .2s ease;
}
.theme-switch button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow);}

/* ===== Hero ===== */
.hero{position:relative;padding:96px 0 76px;text-align:center;overflow:hidden;}
.hero-glow{
  position:absolute;top:-260px;left:50%;transform:translateX(-50%);
  width:900px;height:900px;
  background:radial-gradient(circle,rgba(21,128,61,0.07) 0%,rgba(20,23,31,0.03) 40%,transparent 70%);
  filter:blur(50px);pointer-events:none;
}
:root[data-theme="dark"] .hero-glow{background:radial-gradient(circle,rgba(22,163,74,0.20) 0%,rgba(255,255,255,0.04) 40%,transparent 70%);}
.hero .wrap{position:relative;z-index:1;}
.eyebrow{
  display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--text-dim);
  background:var(--surface);border:1px solid var(--border);padding:7px 15px;border-radius:100px;margin-bottom:26px;
  box-shadow:var(--shadow);
}
.dot{width:6px;height:6px;border-radius:50%;background:#16a34a;box-shadow:0 0 8px rgba(22,163,74,0.5);}
h1.headline{
  font-size:clamp(32px,6vw,68px);font-weight:800;letter-spacing:-0.03em;line-height:1.08;
  margin:0 0 18px;color:var(--text);text-wrap:balance;
}
h1.headline .grad{color:var(--accent);}
.sub{font-size:clamp(16px,2vw,19px);color:var(--text-dim);max-width:580px;margin:0 auto 34px;}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:56px;}
.btn{padding:13px 26px;border-radius:100px;font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:8px;transition:transform .18s cubic-bezier(.16,1,.3,1),box-shadow .18s ease;}
.btn-primary{background:var(--accent-grad);color:#fff;box-shadow:0 8px 24px rgba(21,128,61,0.28);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(21,128,61,0.38);}
.btn-secondary{background:var(--surface);border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);}
.btn-secondary:hover{transform:translateY(-2px);}
.btn:active{transform:scale(.96);}

/* ===== Mock UI (bandeja tipo WhatsApp) ===== */
.mock{max-width:900px;margin:0 auto;border-radius:var(--radius-lg);border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow-lg);overflow:hidden;text-align:left;}
.mock-bar{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border);background:var(--surface-2);}
.mock-bar .dots{display:flex;gap:6px;}
.mock-bar .dots span{width:10px;height:10px;border-radius:50%;background:var(--border);}
.mock-bar .label{font-size:12.5px;color:var(--text-faint);font-weight:600;}
.mock-body{padding:0;display:grid;grid-template-columns:280px 1fr;}
@media (max-width:680px){.mock-body{grid-template-columns:1fr;}.mock-list{display:none;}}
.mock-list{border-right:1px solid var(--border);padding:10px;}
.chat-item{display:flex;gap:10px;align-items:center;padding:10px;border-radius:12px;margin-bottom:4px;}
.chat-item.active{background:var(--surface-2);}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--accent-grad);flex-shrink:0;}
.chat-meta .name{font-size:13px;font-weight:600;color:var(--text);}
.chat-meta .preview{font-size:12px;color:var(--text-faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:170px;}
.chat-status{font-size:10px;font-weight:700;padding:2px 7px;border-radius:100px;margin-left:auto;white-space:nowrap;}
.st-ia{background:rgba(124,58,237,0.12);color:var(--mod-ia);}
.st-agente{background:rgba(22,163,74,0.12);color:var(--mod-conv);}
.chat-window{padding:22px;display:flex;flex-direction:column;gap:10px;background:var(--bg);}
.bubble{max-width:78%;padding:10px 14px;border-radius:16px;font-size:13.5px;}
.bubble.in{background:var(--surface);border:1px solid var(--border);align-self:flex-start;border-bottom-left-radius:4px;}
.bubble.out{background:var(--accent-grad);align-self:flex-end;border-bottom-right-radius:4px;color:#fff;}
.bubble.system{align-self:center;font-size:11.5px;color:var(--text-faint);background:transparent;padding:4px 0;}
.typing{align-self:flex-start;display:flex;gap:4px;padding:10px 14px;}
.typing span{width:6px;height:6px;border-radius:50%;background:var(--text-faint);animation:blink 1.2s infinite ease-in-out;}
.typing span:nth-child(2){animation-delay:.2s;}
.typing span:nth-child(3){animation-delay:.4s;}
@keyframes blink{0%,80%,100%{opacity:.3;}40%{opacity:1;}}
@keyframes pop{from{opacity:0;transform:translateY(6px) scale(.98);}to{opacity:1;transform:none;}}

/* Los mensajes de la bandeja entran uno por uno cuando el mock aparece en pantalla */
.chat-window .bubble{opacity:0;}
.mock.in .chat-window .bubble{animation:pop .45s cubic-bezier(.16,1,.3,1) forwards;}
.mock.in .chat-window .bubble:nth-child(1){animation-delay:.25s;}
.mock.in .chat-window .bubble:nth-child(2){animation-delay:.55s;}
.mock.in .chat-window .bubble:nth-child(3){animation-delay:.95s;}
.mock.in .chat-window .bubble:nth-child(4){animation-delay:1.25s;}

/* ===== Reveal (entrada corta y "seca", tipo Attio/Linear) ===== */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .55s cubic-bezier(.16,1,.3,1), transform .55s cubic-bezier(.16,1,.3,1);}
.reveal.in{opacity:1;transform:none;}
/* Entradas escalonadas dentro de una grilla o de los pasos */
.grid .reveal:nth-child(1){transition-delay:0ms;}
.grid .reveal:nth-child(2){transition-delay:70ms;}
.grid .reveal:nth-child(3){transition-delay:140ms;}
.grid .reveal:nth-child(4){transition-delay:210ms;}
.grid .reveal:nth-child(5){transition-delay:280ms;}
.grid .reveal:nth-child(6){transition-delay:350ms;}
.steps .reveal:nth-child(1){transition-delay:0ms;}
.steps .reveal:nth-child(2){transition-delay:80ms;}
.steps .reveal:nth-child(3){transition-delay:160ms;}
.steps .reveal:nth-child(4){transition-delay:240ms;}

/* ===== Sections ===== */
section{padding:96px 0;}
.section-head{text-align:center;max-width:620px;margin:0 auto 56px;}
.kicker{font-size:12.5px;font-weight:700;letter-spacing:0.07em;text-transform:uppercase;color:var(--accent);margin-bottom:14px;display:block;}
h2{font-size:clamp(27px,3.6vw,42px);font-weight:800;letter-spacing:-0.02em;margin:0 0 14px;color:var(--text);text-wrap:balance;}
.section-head p{color:var(--text-dim);font-size:17px;margin:0;}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
@media (max-width:900px){.grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:600px){.grid{grid-template-columns:1fr;}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:28px;box-shadow:var(--shadow);transition:transform .22s cubic-bezier(.16,1,.3,1), box-shadow .22s ease;}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.card .icon{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:19px;color:#fff;}
.icon-panel{background:var(--mod-panel);}
.icon-conv{background:var(--mod-conv);}
.icon-tablero{background:var(--mod-tablero);}
.icon-ia{background:var(--mod-ia);}
.card h3{font-size:17.5px;margin:0 0 8px;font-weight:700;color:var(--text);}
.card p{color:var(--text-dim);font-size:14px;margin:0;}
.card .tag{display:inline-block;margin-top:12px;font-size:11px;font-weight:700;letter-spacing:0.03em;color:var(--text-faint);background:var(--surface-2);padding:3px 9px;border-radius:100px;}

.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
@media (max-width:900px){.steps{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.steps{grid-template-columns:1fr;}}
.step .num{font-size:13px;font-weight:700;color:#fff;background:var(--accent-grad);width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.step h4{font-size:15px;margin:0 0 6px;font-weight:700;color:var(--text);}
.step p{color:var(--text-dim);font-size:13.5px;margin:0;}

.cta-band{border-radius:var(--radius-lg);padding:72px 32px;text-align:center;background:var(--carbon);color:#fff;}
.cta-band h2{color:#fff;margin-bottom:14px;}
.cta-band p{color:rgba(255,255,255,0.72);margin-bottom:30px;font-size:16.5px;}
.cta-band .btn-primary{background:var(--accent-grad);color:#fff;box-shadow:0 10px 30px rgba(21,128,61,0.35);}

/* ===== Legal ===== */
.legal{max-width:760px;margin:0 auto;padding:110px 24px 90px;}
.legal h1{font-size:clamp(30px,4.5vw,44px);font-weight:800;letter-spacing:-0.02em;margin-bottom:8px;color:var(--text);}
.legal .updated{color:var(--text-faint);font-size:13.5px;margin-bottom:52px;}
.legal h2{font-size:20px;margin:40px 0 12px;font-weight:700;color:var(--text);}
.legal p, .legal li{color:var(--text-dim);font-size:15px;line-height:1.7;}
.legal ul{padding-left:20px;}
.legal a.link{color:var(--accent);text-decoration:underline;}
.legal strong{color:var(--text);}
.placeholder{color:#c2410c;font-weight:600;}

/* ===== Footer ===== */
footer{border-top:1px solid var(--border);padding:52px 0 36px;color:var(--text-faint);font-size:13px;}
.footer-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;margin-bottom:36px;}
.footer-col h5{color:var(--text-dim);font-size:11.5px;text-transform:uppercase;letter-spacing:0.06em;margin:0 0 12px;}
.footer-col a{display:block;color:var(--text-faint);margin-bottom:9px;}
.footer-col a:hover{color:var(--text);}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;border-top:1px solid var(--border);padding-top:22px;}

/* ===== Accesibilidad: respeta si el usuario pidió menos movimiento ===== */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:0.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none;}
  .chat-window .bubble{opacity:1;}
}