:root{
  --bg:#ffffff;
  --ink:#1a1d29;
  --muted:#5f6477;
  --brand:#e53935;        /* rojo */
  --brand-dark:#c62828;
  --accent:#2e7d32;       /* verde check */
  --border:#e6e8ee;
  --radius:16px;
  --shadow:0 12px 28px rgba(13,26,48,.08);
  --font:Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg)}
a{color:inherit;text-decoration:none}
.container{max-width:1120px;margin:0 auto;padding:0 24px}
.header{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--border);z-index:50}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:900}
.logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,#ff7a7a,#ff3d71)}
nav a{padding:10px 12px;border-radius:10px;color:#3c4257}
nav a:hover{background:#f6f7fb}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 18px;border-radius:12px;border:1px solid transparent;font-weight:800;cursor:pointer}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 20px rgba(229,57,53,.25)}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{border:1px solid var(--border);background:#fff;color:#3c4257}
.btn-ghost:hover{background:#f9f9fb}
.btn-lite{background:#fff;color:#1a1d29;border:1px solid var(--border)}
/* HERO */
.hero{padding:44px 0 10px;text-align:center}
h1{font-size:44px;line-height:1.05;margin:6px 0 4px}
.sub{color:var(--muted);max-width:760px;margin:0 auto 28px}
/* DROPZONE */
.drop{display:flex;align-items:center;justify-content:center;background:var(--brand);border-radius:20px;box-shadow:var(--shadow);border:4px dashed rgba(255,255,255,.6);min-height:250px;position:relative}
.drop .inner{display:flex;flex-direction:column;align-items:center;gap:12px;color:#fff}
.drop .bigcta{display:inline-flex;align-items:center;gap:10px;background:#fff;color:var(--ink);padding:14px 18px;border-radius:12px;font-weight:900}
.drop small{opacity:.9}
.helper{text-align:center;color:#6b7280;margin-top:10px}
/* SECTIONS */
.section{padding:28px 0}
.grid{display:grid;gap:24px}
.grid.two{grid-template-columns:1.1fr .9fr}
.card{background:#fff;border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:18px}
.list{display:flex;flex-direction:column;gap:12px}
.item{display:flex;gap:12px;align-items:flex-start}
.check{width:22px;height:22px;border-radius:50%;background:var(--accent);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:14px;line-height:1}
.kbd{background:#f3f4f7;border:1px solid var(--border);border-radius:8px;padding:2px 8px;font-size:12px;color:#444}
.footer{border-top:1px solid var(--border);padding:26px 0;margin-top:30px;color:#74798e;font-size:14px;text-align:center}
input,select{width:100%;padding:12px;border:1px solid var(--border);border-radius:10px}
/* progress */
.progress{height:8px;background:#eef1f5;border-radius:10px;overflow:hidden}
.progress>div{height:100%;background:linear-gradient(90deg,#e53935,#ff9800)}