/* =========================================================
   MindStackByte — Design tokens
   ========================================================= */
:root{
  --ink:      #0B1E33;
  --navy:     #14335B;
  --steel:    #2C5F8A;
  --accent:   #3E8EDE;
  --teal:     #2FBEA6;
  --slate:    #4A5568;
  --slate-2:  #6B7A8F;
  --paper:    #F4F6F9;
  --paper-2:  #E7ECF2;
  --white:    #FFFFFF;
  --line:     #DCE3EC;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow-lg: 0 24px 60px -20px rgba(11,30,51,0.35);
  --shadow-sm: 0 8px 24px -12px rgba(11,30,51,0.25);
  --container: 1160px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--navy);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  line-height:1.55;
}
h1,h2,h3{ font-family:var(--font-display); color:var(--ink); margin:0; line-height:1.1; }
p{ margin:0; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }
img{ max-width:100%; display:block; }
.mono{ font-family:var(--font-mono); }

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:4px;
}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}

/* =========================================================
   Buttons
   ========================================================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  border-radius:999px;
  font-weight:600;
  font-size:0.95rem;
  border:1px solid transparent;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease;
  white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); }
.btn--primary{ background:var(--accent); color:var(--white); box-shadow:var(--shadow-sm); }
.btn--primary:hover{ background:#3379c4; }
.btn--outline{ background:transparent; color:var(--navy); border-color:var(--line); }
.btn--outline:hover{ border-color:var(--accent); color:var(--accent); }
.btn--ghost{ background:rgba(255,255,255,0.08); color:var(--white); border-color:rgba(255,255,255,0.25); }
.btn--ghost:hover{ background:rgba(255,255,255,0.16); }
.btn--sm{ padding:9px 16px; font-size:0.85rem; }
.btn--block{ width:100%; }

/* =========================================================
   Header
   ========================================================= */
.header{
  position:sticky; top:0; z-index:40;
  background:rgba(11,30,51,0.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.header__row{ display:flex; align-items:center; justify-content:space-between; height:72px; }
.brand{ display:flex; align-items:center; gap:10px; }
.brand__name{ font-family:var(--font-display); font-weight:700; color:var(--white); font-size:1.15rem; letter-spacing:-0.01em; }
.nav{ display:flex; gap:32px; }
.nav a{ color:rgba(255,255,255,0.82); font-weight:500; font-size:0.95rem; transition:color .15s ease; }
.nav a:hover{ color:var(--white); }
.header__cta{ display:flex; align-items:center; gap:14px; }

.nav__toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:38px; height:38px; background:none; border:none; padding:0;
}
.nav__toggle span{ width:100%; height:2px; background:var(--white); border-radius:2px; transition:transform .2s ease, opacity .2s ease; }
.nav__toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2){ opacity:0; }
.nav__toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero{
  background:radial-gradient(120% 140% at 15% 0%, #10294a 0%, var(--ink) 55%, #081627 100%);
  padding:88px 0 64px;
  overflow:hidden;
}
.hero__grid{
  display:grid;
  grid-template-columns:1.05fr 0.95fr;
  gap:48px;
  align-items:center;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:0.78rem; letter-spacing:0.06em; text-transform:uppercase;
  color:#9FC6EE; margin-bottom:20px;
}
.eyebrow__dot{ width:7px; height:7px; border-radius:50%; background:var(--teal); box-shadow:0 0 0 4px rgba(47,190,166,0.2); }
.hero__title{ font-size:clamp(2.2rem, 4.2vw, 3.4rem); color:var(--white); font-weight:700; letter-spacing:-0.02em; }
.text-accent{ color:var(--teal); }
.hero__lead{ color:#C6D5E6; font-size:1.08rem; max-width:52ch; margin-top:20px; }
.hero__actions{ display:flex; gap:14px; flex-wrap:wrap; margin-top:32px; }
.hero__meta{
  margin-top:32px; display:flex; flex-wrap:wrap; gap:8px;
  font-family:var(--font-mono); font-size:0.82rem; color:#7C93AE;
}
.hero__meta .dot{ color:#3E5878; }

.hero__art{ position:relative; }
.stack-svg{ width:100%; height:auto; overflow:visible; }
.stack-label{ font-family:var(--font-mono); font-size:11.5px; fill:#EAF4FF; letter-spacing:0.03em; }
.stack-label--dark{ fill:#08322c; }
.stack-code{ font-family:var(--font-mono); font-size:15px; fill:#EAF4FF; opacity:0.85; }
.stack-pulse-line{ stroke:url(#gTop); stroke:#3E8EDE; stroke-width:2; stroke-dasharray:4 6; opacity:0.5; }

.stack-layer{
  opacity:0;
  transform:translateY(24px);
  animation:stackIn .7s cubic-bezier(.2,.7,.3,1) forwards;
  animation-delay:calc(var(--d) * 140ms + 200ms);
}
.stack-layer--top{ animation-name:stackInTop; }
@keyframes stackIn{ to{ opacity:1; transform:translateY(0); } }
@keyframes stackInTop{ to{ opacity:1; transform:translateY(0); } }

.byte-float{ font-family:var(--font-mono); font-size:12px; fill:#3E8EDE; opacity:0.55; animation:floatY 5s ease-in-out infinite; }
.byte-float--a{ animation-delay:.2s; }
.byte-float--b{ animation-delay:1.1s; }
.byte-float--c{ animation-delay:2s; }
@keyframes floatY{ 0%,100%{ transform:translateY(0);} 50%{ transform:translateY(-10px);} }

/* =========================================================
   Marquee strip
   ========================================================= */
.strip{
  background:var(--navy); overflow:hidden; padding:14px 0;
  border-top:1px solid rgba(255,255,255,0.08);
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.strip__track{
  display:flex; gap:14px; white-space:nowrap; width:max-content;
  font-family:var(--font-mono); font-size:0.78rem; letter-spacing:0.08em;
  color:#9FC6EE;
  animation:marquee 26s linear infinite;
}
.strip__track span{ padding:0 2px; }
@keyframes marquee{ from{ transform:translateX(0);} to{ transform:translateX(-50%);} }

/* =========================================================
   Section shared
   ========================================================= */
.section{ padding:96px 0; }
.section--dark{ background:var(--ink); }
.section--paper{ background:var(--paper); }
.section__eyebrow{
  font-family:var(--font-mono); font-size:0.78rem; letter-spacing:0.08em; text-transform:uppercase;
  color:var(--steel); margin-bottom:14px;
}
.section__eyebrow--light{ color:#8FC1EE; }
.section__title{ font-size:clamp(1.8rem, 3vw, 2.5rem); max-width:20ch; }
.section__title--light{ color:var(--white); }
.section__lead{ color:var(--slate); font-size:1.05rem; max-width:58ch; margin-top:16px; }
.section__lead--light{ color:#B9C9DC; }

/* reveal-on-scroll */
[data-reveal]{ opacity:0; transform:translateY(22px); transition:opacity .6s ease, transform .6s ease; }
[data-reveal].is-visible{ opacity:1; transform:translateY(0); }

/* =========================================================
   Services
   ========================================================= */
.services{
  margin-top:52px;
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:20px;
}
.service-card{
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 24px;
  position:relative;
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.service-card:hover{ transform:translateY(-6px); box-shadow:var(--shadow-sm); border-color:transparent; }
.service-card__num{ position:absolute; top:22px; right:24px; font-size:0.78rem; color:var(--slate-2); }
.service-card__icon{
  width:48px; height:48px; border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:20px; color:var(--white);
}
.service-card__icon--base{ background:linear-gradient(135deg,var(--ink),var(--navy)); }
.service-card__icon--dev{ background:linear-gradient(135deg,var(--navy),var(--steel)); }
.service-card__icon--design{ background:linear-gradient(135deg,var(--steel),var(--accent)); }
.service-card__icon--ai{ background:linear-gradient(135deg,var(--accent),var(--teal)); }
.service-card h3{ font-size:1.08rem; margin-bottom:10px; }
.service-card p{ color:var(--slate); font-size:0.92rem; }
.service-card--accent{ border-color:rgba(47,190,166,0.4); background:linear-gradient(180deg,#FBFEFE, var(--white)); }

/* =========================================================
   About / stack status card
   ========================================================= */
.about{ display:grid; grid-template-columns:1.1fr 0.9fr; gap:56px; align-items:center; }
.check-list{ margin-top:24px; display:flex; flex-direction:column; gap:12px; }
.check-list li{
  color:#DCE7F3; font-size:0.98rem; padding-left:26px; position:relative;
}
.check-list li::before{
  content:''; position:absolute; left:0; top:6px; width:14px; height:14px;
  border-radius:4px; background:var(--teal); opacity:0.9;
}
.glow-card{
  background:linear-gradient(180deg, #0F2A48, #0B1E33);
  border:1px solid rgba(63,214,193,0.25);
  border-radius:var(--radius);
  padding:28px;
  box-shadow:0 0 60px -10px rgba(47,190,166,0.25);
}
.glow-card__tag{ color:#6FE3C9; font-size:0.82rem; margin-bottom:16px; }
.glow-card__line{ color:#DCE7F3; font-size:0.95rem; padding:6px 0; font-family:var(--font-mono); }
.glow-card__line .ok{ color:var(--teal); margin-right:8px; }
.glow-card__foot{ margin-top:16px; color:#5C7A97; font-size:0.78rem; }

/* =========================================================
   Pricing
   ========================================================= */
.pricing{ margin-top:52px; display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.price-card{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius);
  padding:32px 28px; display:flex; flex-direction:column; gap:16px;
  position:relative;
}
.price-card h3{ font-size:1.2rem; }
.price-card__desc{ color:var(--slate); font-size:0.9rem; min-height:40px; }
.price-card__price{ font-size:1.5rem; font-family:var(--font-display); font-weight:700; color:var(--ink); }
.price-card__price .mono{ font-size:1.1rem; color:var(--accent); }
.price-card ul{ display:flex; flex-direction:column; gap:10px; margin:4px 0 8px; flex:1; }
.price-card ul li{ font-size:0.9rem; color:var(--slate); padding-left:20px; position:relative; }
.price-card ul li::before{ content:'—'; position:absolute; left:0; color:var(--accent); }
.price-card--featured{
  border-color:var(--accent); box-shadow:var(--shadow-lg); transform:scale(1.03);
  background:linear-gradient(180deg,#FBFDFF,var(--white));
}
.price-card__badge{
  position:absolute; top:-13px; left:28px; background:var(--accent); color:var(--white);
  font-size:0.72rem; font-weight:700; padding:5px 12px; border-radius:999px; letter-spacing:0.03em;
}
.price-note{ margin-top:24px; color:var(--slate-2); font-size:0.82rem; }

/* =========================================================
   Contact
   ========================================================= */
.contact{ display:grid; grid-template-columns:0.9fr 1.1fr; gap:56px; align-items:start; }
.contact__items{ margin-top:32px; display:flex; flex-direction:column; gap:14px; }
.contact__item{
  display:flex; flex-direction:column; gap:2px;
  padding:16px 20px; background:var(--white); border:1px solid var(--line); border-radius:var(--radius-sm);
  transition:border-color .15s ease;
}
a.contact__item:hover{ border-color:var(--accent); }
.contact__label{ font-size:0.72rem; letter-spacing:0.06em; text-transform:uppercase; color:var(--slate-2); }

.contact-form{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius);
  padding:32px; display:flex; flex-direction:column; gap:18px; box-shadow:var(--shadow-sm);
}
.field{ display:flex; flex-direction:column; gap:6px; }
.field-row{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
label{ font-size:0.82rem; font-weight:600; color:var(--navy); }
input, select, textarea{
  font-family:var(--font-body); font-size:0.95rem; padding:12px 14px;
  border:1px solid var(--line); border-radius:var(--radius-sm); background:var(--paper);
  color:var(--navy); resize:vertical; transition:border-color .15s ease, background .15s ease;
}
input:focus, select:focus, textarea:focus{ border-color:var(--accent); background:var(--white); outline:none; }
.field__error{ font-size:0.78rem; color:#C6483A; min-height:1em; }
.form-status{ font-size:0.88rem; text-align:center; min-height:1.2em; color:var(--steel); font-weight:600; }
.form-status.is-error{ color:#C6483A; }
.form-status.is-ok{ color:var(--teal); }

/* =========================================================
   Footer
   ========================================================= */
.footer{ background:var(--ink); padding:36px 0; }
.footer__row{ display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:16px; }
.footer__nav{ display:flex; gap:24px; }
.footer__nav a{ color:#9FB4CB; font-size:0.88rem; }
.footer__nav a:hover{ color:var(--white); }
.footer__copy{ color:#5C7A97; font-size:0.8rem; }

/* =========================================================
   Floating buttons (WhatsApp + Chat)
   ========================================================= */
.float-btn{
  position:fixed; bottom:24px; z-index:50;
  width:56px; height:56px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  color:var(--white); border:none; box-shadow:0 10px 30px -8px rgba(11,30,51,0.5);
  transition:transform .18s ease;
}
.float-btn:hover{ transform:translateY(-3px) scale(1.04); }
.float-btn--whatsapp{ left:24px; background:#25D366; }
.float-btn--whatsapp::before{
  content:''; position:absolute; inset:0; border-radius:50%;
  box-shadow:0 0 0 0 rgba(37,211,102,0.55);
  animation:pulseRing 2.4s ease-out infinite;
}
@keyframes pulseRing{
  0%{ box-shadow:0 0 0 0 rgba(37,211,102,0.55); }
  70%{ box-shadow:0 0 0 16px rgba(37,211,102,0); }
  100%{ box-shadow:0 0 0 0 rgba(37,211,102,0); }
}
.float-btn--chat{ right:24px; background:linear-gradient(135deg,var(--accent),var(--teal)); }

/* =========================================================
   Chat panel
   ========================================================= */
.chat-panel{
  position:fixed; right:24px; bottom:92px; z-index:50;
  width:360px; max-width:calc(100vw - 48px); height:480px; max-height:70vh;
  background:var(--white); border-radius:18px; box-shadow:var(--shadow-lg);
  border:1px solid var(--line);
  display:flex; flex-direction:column; overflow:hidden;
  opacity:0; transform:translateY(16px) scale(0.98); pointer-events:none;
  transition:opacity .2s ease, transform .2s ease;
}
.chat-panel.is-open{ opacity:1; transform:translateY(0) scale(1); pointer-events:auto; }
.chat-panel__header{
  display:flex; align-items:center; gap:10px; padding:16px 18px;
  background:var(--ink); color:var(--white);
}
.chat-panel__title{ font-weight:600; font-size:0.92rem; }
.chat-panel__status{ font-size:0.75rem; color:#9FC6EE; display:flex; align-items:center; gap:6px; }
.status-dot{ width:7px; height:7px; border-radius:50%; background:var(--teal); }

.chat-panel__body{
  flex:1; overflow-y:auto; padding:16px; display:flex; flex-direction:column; gap:10px;
  background:var(--paper);
}
.chat-msg{ max-width:82%; padding:10px 13px; border-radius:14px; font-size:0.88rem; line-height:1.45; }
.chat-msg--bot{ background:var(--white); border:1px solid var(--line); align-self:flex-start; border-bottom-left-radius:4px; }
.chat-msg--user{ background:var(--accent); color:var(--white); align-self:flex-end; border-bottom-right-radius:4px; }

.chat-panel__quick{ display:flex; flex-wrap:wrap; gap:6px; padding:0 14px 10px; }
.chat-quick-btn{
  font-size:0.76rem; background:var(--paper-2); border:1px solid var(--line); color:var(--navy);
  padding:6px 11px; border-radius:999px; transition:background .15s ease;
}
.chat-quick-btn:hover{ background:var(--white); border-color:var(--accent); }

.chat-panel__input{ display:flex; gap:8px; padding:12px 14px; border-top:1px solid var(--line); }
.chat-panel__input input{ flex:1; background:var(--paper); }
.chat-panel__input button{
  width:40px; height:40px; border-radius:50%; border:none; background:var(--accent); color:var(--white);
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 980px){
  .hero__grid{ grid-template-columns:1fr; }
  .hero__art{ order:-1; max-width:360px; margin:0 auto; }
  .services{ grid-template-columns:repeat(2,1fr); }
  .about, .contact{ grid-template-columns:1fr; }
  .pricing{ grid-template-columns:1fr; }
  .price-card--featured{ transform:none; }
}

@media (max-width: 760px){
  .nav{
    position:absolute; top:72px; left:0; right:0;
    background:var(--ink); flex-direction:column; padding:16px 24px 24px; gap:4px;
    display:none;
  }
  .nav.is-open{ display:flex; }
  .nav a{ padding:12px 0; border-bottom:1px solid rgba(255,255,255,0.08); }
  .nav__toggle{ display:flex; }
  .header__cta .btn--ghost span{ display:none; }
  .services{ grid-template-columns:1fr; }
  .field-row{ grid-template-columns:1fr; }
  .chat-panel{ right:12px; left:12px; width:auto; bottom:88px; }
  .float-btn--chat{ right:16px; }
  .float-btn--whatsapp{ left:16px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}