/* DronDemand · basado en el Manual de Identidad BlueStone
   Regla 60·30·10: negros de base, blanco/plata para texto, azul solo para lo que debe brillar. */
:root{
  --obsidiana:#0B0C0E; --carbon:#17191D; --grafito:#201E1E; --acero:#7C8794;
  --plata:#C9CED4; --hueso:#F2F4F6; --puente:#1B578D; --ingenieria:#136EA5;
  --cielo:#0095D0; --glaciar:#4FB3E6;
  --line:rgba(201,206,212,.12); --line-2:rgba(201,206,212,.2);
  --grad:linear-gradient(90deg,var(--obsidiana) 0%,var(--puente) 45%,var(--ingenieria) 70%,var(--cielo) 100%);
  --grad-btn:linear-gradient(90deg,var(--ingenieria),var(--cielo));
  --ok:#3ccf91; --err:#ff6b6b;
  --r:12px;
  --f:"Montserrat",Arial,"Century Gothic",sans-serif;
  --fh:"Cinzel","Times New Roman",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;font-family:var(--f);color:var(--plata);background:var(--obsidiana);line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:var(--glaciar)}
h1,h2,h3{font-family:var(--fh);line-height:1.15;margin:0;color:var(--hueso);font-weight:600}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.wrap--narrow{max-width:780px}

/* botones */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 .95rem/1 var(--f);letter-spacing:.02em;padding:16px 24px;border-radius:999px;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .2s,background .2s}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible{outline:2px solid var(--glaciar);outline-offset:3px}
.btn--accent{background:var(--grad-btn);color:#fff;box-shadow:0 10px 28px -12px rgba(0,149,208,.8)}
.btn--accent:hover{box-shadow:0 14px 32px -10px rgba(0,149,208,.95)}
.btn--ghost{border-color:var(--line-2);color:var(--hueso)}
.btn--ghost:hover{border-color:var(--glaciar);background:rgba(79,179,230,.06)}
.btn--sm{padding:11px 18px;font-size:.85rem;white-space:nowrap}
.btn--block{width:100%}
.btn[disabled]{opacity:.6;cursor:wait;transform:none}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(11,12,14,.88);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav__inner{display:flex;align-items:center;gap:24px;height:68px}
.brand{display:flex;align-items:center;gap:10px;color:var(--hueso);text-decoration:none}
.brand__iso{width:40px;height:auto}
.brand__name{display:flex;flex-direction:column;line-height:1}
.brand__name span{font:600 1.2rem var(--fh);letter-spacing:.02em}
.brand__name span b{color:var(--glaciar);font-weight:600}
.brand__name small{font:500 .62rem var(--f);letter-spacing:.24em;text-transform:uppercase;color:var(--acero);margin-top:5px}
.nav__links{display:flex;gap:26px;margin-left:auto}
.nav__links a{color:var(--plata);text-decoration:none;font-size:.85rem;font-weight:500;letter-spacing:.02em}
.nav__links a:hover{color:var(--hueso)}

/* rótulo de sección: —— 01 · TEXTO */
.eyebrow{display:flex;align-items:center;gap:14px;font:600 .74rem var(--f);letter-spacing:.32em;text-transform:uppercase;color:var(--glaciar);margin:0 0 16px}
.eyebrow::before{content:"";width:36px;height:1px;background:var(--glaciar)}
.eyebrow--light{color:var(--glaciar)}

/* hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(900px 520px at 78% 35%,rgba(27,87,141,.38) 0%,transparent 65%),var(--obsidiana)}
.hero__trail{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.hero__trail path{fill:none}
.hero__inner{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding-top:88px;padding-bottom:96px}
.hero__tag{font:500 .82rem var(--f);color:var(--plata);display:flex;align-items:center;gap:10px;margin:22px 0 0}
.dot{width:7px;height:7px;border-radius:50%;background:var(--glaciar);box-shadow:0 0 0 4px rgba(79,179,230,.18)}
.hero h1{font-size:clamp(2.2rem,4.8vw,3.7rem);letter-spacing:.01em}
.hl{color:var(--glaciar)}
.lead{font-size:1.08rem;color:var(--plata);max-width:560px;margin:22px 0 32px;font-weight:400}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px}
.hero__facts{list-style:none;padding:0;margin:44px 0 0;display:flex;flex-wrap:wrap;gap:32px}
.hero__facts li{display:flex;flex-direction:column;padding-left:14px;border-left:1px solid var(--glaciar)}
.hero__facts b{font:600 1.05rem var(--fh);color:var(--hueso)}
.hero__facts span{font-size:.8rem;color:var(--acero)}

.survey{width:100%;height:auto}
.survey__panel{fill:var(--carbon);stroke:var(--line-2);stroke-width:1}
.survey__grid{stroke:rgba(201,206,212,.06);stroke-width:1}
.survey__poly{fill:rgba(0,149,208,.12);stroke:var(--glaciar);stroke-width:2;stroke-linejoin:round;stroke-dasharray:7 6;animation:dash 18s linear infinite}
.survey__pts circle{fill:var(--obsidiana);stroke:var(--hueso);stroke-width:2.5}
.survey__path{stroke:rgba(79,179,230,.45);stroke-width:1.5;stroke-dasharray:2 6;fill:none}
.survey__tag rect{fill:var(--obsidiana);stroke:var(--line-2)}
.survey__tag text{font:500 11px var(--f);fill:var(--acero);letter-spacing:.08em}
.survey__tag text.b{font:600 16px var(--fh);fill:var(--hueso)}
.survey__arch{fill:url(#archGrad);opacity:.9}
.drone{animation:hover 4s ease-in-out infinite}
.drone__arm{stroke:var(--hueso);stroke-width:4;stroke-linecap:round}
.drone__rotor{fill:rgba(242,244,246,.22);stroke:var(--hueso);stroke-width:1.3;animation:spin .25s linear infinite;transform-box:fill-box;transform-origin:center}
.drone__core{fill:var(--hueso)}
.drone__cam{fill:var(--cielo)}
.drone__shadow{fill:rgba(0,0,0,.5);animation:shadow 4s ease-in-out infinite;transform-box:fill-box;transform-origin:center}
.drone__trail{fill:none;stroke:var(--hueso);stroke-width:2.5;stroke-linecap:round;opacity:.85}
@keyframes hover{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}
@keyframes shadow{0%,100%{transform:scale(1);opacity:.9}50%{transform:scale(.8);opacity:.5}}
@keyframes spin{0%{transform:scaleX(1)}50%{transform:scaleX(.55)}100%{transform:scaleX(1)}}
@keyframes dash{to{stroke-dashoffset:-260}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}

/* franja de degradado (firma de marca) */
.stripe{height:3px;background:var(--grad);border:0;margin:0}

/* usos */
.uses{display:flex;align-items:center;gap:22px;padding-top:28px;padding-bottom:28px;flex-wrap:wrap}
.uses__label{margin:0;font:600 .7rem var(--f);text-transform:uppercase;letter-spacing:.3em;color:var(--acero)}
.uses__list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.uses__list li{font-size:.84rem;padding:7px 14px;border:1px solid var(--line-2);border-radius:999px;color:var(--plata)}

/* secciones */
.section{padding:96px 0;position:relative}
.section--tint{background:var(--carbon)}
.section--dark{background:radial-gradient(900px 500px at 15% 0%,rgba(27,87,141,.35),transparent 60%),var(--obsidiana)}
.h2{font-size:clamp(1.75rem,3.3vw,2.6rem);margin-bottom:14px}
.sub{color:var(--plata);font-size:1rem;max-width:640px;margin:0 0 36px}
.sub b{color:var(--hueso)}
.section--dark .sub{color:var(--plata)}

/* pasos con íconos de línea en círculo */
.steps{list-style:none;padding:0;margin:40px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.steps li{padding:28px 24px;border:1px solid var(--line);border-radius:var(--r);background:var(--carbon)}
.steps__icon{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;border:1.5px solid var(--cielo);margin-bottom:20px}
.steps__icon svg{width:22px;height:22px;fill:none;stroke:var(--hueso);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.steps__n{font:600 .7rem var(--f);letter-spacing:.3em;color:var(--glaciar);display:block;margin-bottom:6px}
.steps h3{font-size:1.1rem;margin-bottom:8px}
.steps p{margin:0;color:var(--acero);font-size:.9rem}

/* precios */
.tabs{display:inline-flex;border:1px solid var(--line-2);border-radius:999px;padding:4px;margin-bottom:28px;max-width:100%}
.tab{font:600 .85rem var(--f);letter-spacing:.02em;border:0;background:transparent;color:var(--acero);padding:11px 20px;border-radius:999px;cursor:pointer;white-space:nowrap}
.tab.is-active{background:var(--hueso);color:var(--obsidiana)}
.tab:focus-visible{outline:2px solid var(--glaciar);outline-offset:2px}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{position:relative;background:var(--obsidiana);border:1px solid var(--line);border-radius:var(--r);padding:28px 22px;display:flex;flex-direction:column;overflow:hidden}
.card::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--grad);opacity:0;transition:opacity .2s}
.card:hover::after{opacity:1}
.card--feat{border-color:rgba(0,149,208,.55);box-shadow:0 20px 40px -24px rgba(0,149,208,.6)}
.card--feat::after{opacity:1}
.badge{align-self:flex-start;margin-bottom:14px;color:var(--glaciar);font:600 .66rem var(--f);letter-spacing:.24em;text-transform:uppercase}
.card h3{font-size:1.15rem}
.card__time{margin:6px 0 20px;color:var(--acero);font-size:.85rem}
.price{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px;margin:0 0 14px}
.price__old{color:var(--acero);text-decoration:line-through;font-size:.9rem}
.price__new{font:600 2.1rem var(--fh);color:var(--hueso)}
.price__tax{font-size:.8rem;color:var(--acero);font-weight:600}
.card__note{margin:auto 0 0;font-size:.86rem;color:var(--acero)}
.fine{font-size:.78rem;color:var(--acero);margin:20px 0 0;max-width:820px}
.fine--light{color:var(--acero);margin:12px 0 26px}

/* split y formularios */
.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:start}
.checks{list-style:none;padding:0;margin:0;display:grid;gap:14px}
.checks li{position:relative;padding-left:32px;color:var(--plata);font-size:.95rem}
.checks li b{color:var(--hueso)}
.checks li::before{content:"";position:absolute;left:0;top:2px;width:20px;height:20px;border-radius:50%;border:1.5px solid var(--cielo);background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M6 10.5l2.6 2.6L14 7.5' fill='none' stroke='%23F2F4F6' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.checks--light li{color:var(--plata)}

.form{position:relative;background:var(--carbon);border:1px solid var(--line);border-radius:16px;padding:32px;display:grid;gap:18px;overflow:hidden}
.form::before{content:"";position:absolute;left:0;right:0;top:0;height:2px;background:var(--grad)}
.form--dark{background:var(--carbon)}
.form__row{display:grid;gap:16px;border:0;padding:0;margin:0;min-width:0}
.form__row--2{grid-template-columns:1fr 1fr}
.form label{display:grid;gap:7px;font-size:.78rem;font-weight:600;letter-spacing:.04em;color:var(--plata);min-width:0}
.opt{font-weight:400;color:var(--acero)}
.form legend{font-size:.78rem;font-weight:600;letter-spacing:.04em;color:var(--plata);margin-bottom:10px;padding:0}
input,select,textarea{font:400 .95rem var(--f);color:var(--hueso);width:100%;padding:13px 14px;border:1px solid var(--line-2);border-radius:10px;background:var(--obsidiana);transition:border-color .15s,box-shadow .15s;min-width:0}
input::placeholder,textarea::placeholder{color:#5d6672}
select{appearance:none;-webkit-appearance:none;background:var(--obsidiana) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 8l5 5 5-5' fill='none' stroke='%237C8794' stroke-width='1.8'/%3E%3C/svg%3E") right 12px center/16px no-repeat;padding-right:36px}
select option,select optgroup{background:var(--carbon);color:var(--hueso)}
textarea{resize:vertical}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--cielo);box-shadow:0 0 0 3px rgba(0,149,208,.2)}
.is-invalid{border-color:var(--err)!important;box-shadow:0 0 0 3px rgba(255,107,107,.15)!important}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:block!important;cursor:pointer}
.chip input{position:absolute;opacity:0;width:1px;height:1px}
.chip span{display:block;padding:10px 16px;border:1px solid var(--line-2);border-radius:999px;font-weight:500;font-size:.86rem;letter-spacing:0;color:var(--plata)}
.chip input:checked+span{border-color:var(--cielo);background:rgba(0,149,208,.14);color:var(--hueso)}
.chip input:focus-visible+span{outline:2px solid var(--glaciar);outline-offset:2px}
.chips.is-invalid{box-shadow:none!important;border:0}
.chips.is-invalid .chip span{border-color:var(--err)}
.consent{display:flex!important;align-items:flex-start;gap:10px!important;font-weight:400!important;letter-spacing:0!important;font-size:.85rem!important;color:var(--acero)!important}
.consent input{width:18px;height:18px;margin:2px 0 0;flex:none;accent-color:var(--cielo)}
.consent.is-invalid{color:var(--err)!important;box-shadow:none!important}
.hp{position:absolute!important;left:-9999px;width:1px;height:1px;overflow:hidden}
.form__msg{margin:0;font-size:.88rem;min-height:1.2em}
.form__msg.err{color:var(--err)}
.form__done{text-align:center;padding:28px 8px}
.form__done h3{font-size:1.45rem;margin:16px 0 10px}
.form__done p{color:var(--plata);margin:0 0 6px}
.form__done .code{display:inline-block;margin-top:14px;font:600 1.3rem var(--fh);letter-spacing:.08em;border:1px solid var(--cielo);color:var(--hueso);padding:10px 20px;border-radius:10px}
.form__done svg{margin:0 auto;width:60px;height:60px}

.demand[hidden]{display:none}
.demand{display:inline-flex;align-items:center;gap:10px;border:1px solid rgba(79,179,230,.4);color:var(--plata);padding:8px 16px;border-radius:999px;margin:0 0 26px;font-size:.88rem}
.demand b{font:600 1.15rem var(--fh);color:var(--hueso)}
.earn{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.earn div{background:var(--carbon);border:1px solid var(--line);border-radius:10px;padding:14px 12px;display:flex;flex-direction:column;gap:4px}
.earn span{font-size:.72rem;color:var(--acero);letter-spacing:.04em}
.earn b{font:600 1.15rem var(--fh);color:var(--hueso)}

/* faq */
details{border-bottom:1px solid var(--line);padding:4px 0}
summary{cursor:pointer;list-style:none;font-weight:600;color:var(--hueso);padding:18px 36px 18px 0;position:relative;font-size:1rem}
summary::-webkit-details-marker{display:none}
summary::after{content:"";position:absolute;right:4px;top:50%;width:22px;height:22px;margin-top:-11px;border:1.5px solid var(--cielo);border-radius:50%;background:linear-gradient(var(--hueso),var(--hueso)) center/10px 1.5px no-repeat,linear-gradient(var(--hueso),var(--hueso)) center/1.5px 10px no-repeat;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{margin:0 0 20px;color:var(--plata);font-size:.95rem}

/* footer */
.footer{background:var(--obsidiana);color:var(--acero);padding:56px 0 40px;font-size:.84rem;border-top:1px solid var(--line)}
.footer__inner{display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap}
.footer__brand{display:flex;align-items:center;gap:22px}
.footer__brand img{width:130px;height:auto}
.footer__brand p{margin:0;max-width:280px}
.footer__brand strong{display:block;font:600 1rem var(--fh);color:var(--hueso);margin-bottom:4px}
.footer__links{display:flex;gap:22px;flex-wrap:wrap}
.footer a{color:var(--plata);text-decoration:none}
.footer a:hover{color:var(--glaciar)}
.footer__legal{margin-top:32px;padding-top:20px;border-top:1px solid var(--line);font-size:.72rem;letter-spacing:.24em;text-transform:uppercase}

/* página legal */
.legal{padding:64px 0 88px}
.legal h1{font-size:2rem;margin-bottom:8px}
.legal h2{font-size:1.15rem;margin:32px 0 10px}
.legal p,.legal li{color:var(--plata)}
.todo{background:rgba(255,200,60,.18);color:#ffd877;padding:0 4px;border-radius:4px}

/* responsive */
@media (max-width:980px){
  .hero__inner{grid-template-columns:1fr;padding-top:56px;padding-bottom:64px}
  .hero__art{max-width:440px;margin:0 auto;width:100%}
  .steps{grid-template-columns:1fr 1fr}
  .cards{grid-template-columns:1fr 1fr}
  .split{grid-template-columns:1fr;gap:40px}
  .earn{grid-template-columns:repeat(3,1fr)}
  .nav__links{display:none}
  .nav .btn{margin-left:auto}
}
@media (max-width:600px){
  .wrap{padding-left:16px;padding-right:16px}
  .section{padding:68px 0}
  .steps,.cards{grid-template-columns:1fr}
  .form{padding:22px}
  .form__row--2{grid-template-columns:1fr}
  .earn{grid-template-columns:1fr 1fr}
  .hero__facts{gap:20px}
  .hero__cta .btn{width:100%}
  .brand__name small{display:none}
  .brand__name span{font-size:1.05rem}
  .nav .btn--sm{padding:10px 14px;font-size:.78rem}
  .eyebrow{letter-spacing:.2em;font-size:.68rem}
  .eyebrow::before{width:24px}
  .hero h1{font-size:2rem}
  .brand__iso{width:34px}
  .tab{padding:10px 13px;font-size:.8rem}
  .footer__brand{flex-direction:column;align-items:flex-start}
}

/* ===== Variante "acento naranja" (color de acción DronDemand) =====
   Activa en <body class="theme-accent">. Solo en botones y promociones (decisión: naranja sutil). */
.theme-accent{--accion:#FF7A1A;--accion-2:#FF9A3D}
.theme-accent .btn--accent{background:linear-gradient(90deg,var(--accion),var(--accion-2));color:#fff;box-shadow:0 10px 28px -12px rgba(255,122,26,.75)}
.theme-accent .btn--accent:hover{box-shadow:0 14px 32px -10px rgba(255,122,26,.9)}
.theme-accent .card--feat .badge{color:var(--accion)}
.theme-accent .price__old::after{content:"−10%";margin-left:8px;text-decoration:none;display:inline-block;font:700 .68rem var(--f);letter-spacing:.06em;color:var(--obsidiana);background:var(--accion);padding:3px 7px;border-radius:999px;vertical-align:2px}
.theme-accent .demand b{color:var(--accion)}