:root{
  --bg:#0b0f14;
  --surface:#10151f;
  --text:#e5e7eb;
  --primary:#22d3ee;
  --accent:#a3e635;
}

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

html,body{ height:100% }
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  line-height:1.6;
}

/* Utilities */
.container{
  width:100%;
  max-width:1100px;
  margin-inline:auto;
  padding-inline:1rem;
}
.page{ padding-block:2rem 4rem }

/* Skip link */
.skip-link{
  position:absolute;
  top:-40px;
  left:0;
  background:var(--primary);
  color:var(--bg);
  padding:.5rem .75rem;
  text-decoration:none;
  border-radius:.375rem;
}
.skip-link:focus{ top:.5rem; left:.5rem }

/* Header */
.site-header{
  border-bottom:2px solid var(--surface);
  position:sticky;
  top:0;
  z-index:10;
  background:linear-gradient(0deg, var(--surface), var(--surface)) padding-box, var(--bg);
}
.site-header .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-block:1rem;
}
.brand{
  display:flex;
  align-items:center;
  gap:.5rem;
}
.brand-dot{
  width:.75rem; height:.75rem;
  border-radius:999px;
  background:var(--accent);
  box-shadow:0 0 8px var(--accent);
}
.brand-name{
  color:var(--text);
  text-decoration:none;
  font-weight:700;
  letter-spacing:.2px;
}
.nav{
  display:flex; gap:.75rem;
}
.nav-link{
  color:var(--text);
  text-decoration:none;
  padding:.5rem .75rem;
  border-radius:.375rem;
  opacity:.85;
}
.nav-link:hover{ opacity:1; background:var(--surface) }
.nav-link.is-active{
  outline:2px solid var(--primary);
  outline-offset:2px;
}

/* Page header */
.page-header{
  margin-block:1.25rem 1.5rem;
}
.page-title{
  margin:0 0 .25rem 0;
  font-size:clamp(1.4rem, 2vw, 1.8rem);
  letter-spacing:.2px;
}
.page-subtitle{
  margin:0;
  opacity:.85;
}

/* Layout */
.layout{
  display:grid;
  gap:1rem;
}
@media (min-width: 960px){
  .layout{
    grid-template-columns: 1.6fr .9fr;
    gap:1.25rem;
  }
}

/* Cards */
.card{
  background:var(--surface);
  border-radius:.75rem;
  padding:1rem;
}
@media (min-width: 640px){
  .card{ padding:1.25rem }
}

/* Form */
.field{ margin-bottom:1rem }
.field-group{
  display:grid;
  gap:1rem;
}
@media (min-width: 640px){
  .field-group{
    grid-template-columns: 1fr 1fr;
  }
}
.label{
  display:block;
  font-weight:600;
  margin-bottom:.35rem;
}
.req{
  color:var(--accent);
  margin-left:.25rem;
}
.hint{
  margin:.4rem 0 0 0;
  font-size:.9rem;
  opacity:.8;
}
.input,
.textarea,
select.input{
  width:100%;
  color:var(--text);
  background:var(--bg);
  border:1px solid var(--surface);
  border-radius:.5rem;
  padding:.6rem .75rem;
  outline:none;
}
.textarea{
  resize:vertical;
}
.input::placeholder,
.textarea::placeholder{ opacity:.6 }

.input:focus,
.textarea:focus,
select.input:focus{
  outline:2px solid var(--primary);
  outline-offset:2px;
}

.actions{
  display:flex;
  flex-wrap:wrap;
  gap:.75rem;
  margin-top:1.25rem;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.65rem 1rem;
  border:1px solid transparent;
  border-radius:.6rem;
  font-weight:600;
  cursor:pointer;
  text-decoration:none;
}
.btn-primary{
  background:var(--primary);
  color:var(--bg);
}
.btn-primary:hover{
  background:var(--accent);
  color:var(--bg);
}
.btn-ghost{
  background:transparent;
  color:var(--primary);
  border-color:var(--primary);
}
.btn-ghost:hover{
  background:var(--surface);
}

/* Aside */
.tips .aside-title{
  margin:.25rem 0 .5rem 0;
  font-size:1.1rem;
}
.tips .aside-subtitle{
  margin:1rem 0 .3rem 0;
  font-size:1rem;
  opacity:.95;
}
.list{
  margin:0;
  padding-left:1.25rem;
}
.list li{
  margin:.35rem 0;
}

/* Footer */
.site-footer{
  border-top:2px solid var(--surface);
  margin-top:2rem;
}
.site-footer .container{
  padding-block:1.25rem 2rem;
  font-size:.95rem;
  opacity:.85;
}