:root {
  --bg: #07111f;
  --panel: #0f1f33;
  --panel-soft: #122942;
  --text: #e8f1ff;
  --muted: #a5bfdc;
  --accent: #49dcb1;
  --accent-strong: #20c997;
  --border: rgba(135, 171, 212, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #1d3c63 0%, var(--bg) 48%, #050b15 100%);
  line-height: 1.6;
}

a {
  color: #8fd6ff;
}

.container {
  width: min(1024px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid var(--border);
  background: rgba(5, 11, 21, 0.8);
  backdrop-filter: blur(8px);
}

.topbar-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  background: rgba(12, 27, 44, 0.72);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
}

.hero {
  padding: 38px 0 22px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(30px, 4.3vw, 44px);
  line-height: 1.15;
}

.hero p {
  margin: 0;
  max-width: 740px;
  color: var(--muted);
}

.cta {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-block;
  text-decoration: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
}

.button.primary {
  background: linear-gradient(120deg, var(--accent-strong), var(--accent));
  color: #04261c;
}

.button.secondary {
  border: 1px solid var(--border);
  background: rgba(12, 27, 44, 0.72);
  color: var(--text);
}

.content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 18px;
  align-items: start;
  padding: 8px 0 44px;
}

.main {
  display: grid;
  gap: 14px;
}

.card {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(17, 35, 56, 0.85), rgba(10, 22, 36, 0.9));
  border-radius: 14px;
  padding: 16px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 21px;
}

.card h3 {
  margin: 12px 0 8px;
  font-size: 17px;
}

.card p,
.card li {
  color: var(--muted);
}

.card ul,
.card ol {
  margin: 0;
  padding-left: 22px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}

.mini {
  border: 1px solid var(--border);
  border-radius: 11px;
  background: rgba(15, 31, 51, 0.6);
  padding: 10px;
}

.mini h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.small {
  font-size: 14px;
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px;
  text-align: left;
  font-size: 14px;
}

th {
  background: rgba(16, 44, 63, 0.8);
  color: #d7ebff;
}

label {
  display: block;
  font-size: 14px;
  margin-bottom: 5px;
  color: #d7ebff;
}

input,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #091729;
  color: var(--text);
  padding: 10px;
  font-size: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}

.result {
  margin-top: 10px;
  border: 1px solid rgba(73, 220, 177, 0.45);
  background: rgba(8, 40, 34, 0.55);
  border-radius: 10px;
  padding: 10px;
  color: #b8ffea;
}

.sidebar {
  display: grid;
  gap: 12px;
  position: sticky;
  top: 14px;
}

.guide-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.guide-list a {
  display: block;
  text-decoration: none;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(13, 28, 46, 0.72);
  color: #d7ebff;
}

.guide-list a:hover,
.nav a:hover,
.button.secondary:hover {
  border-color: rgba(143, 214, 255, 0.6);
}

.footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 16px 0 28px;
  font-size: 13px;
}

@media (max-width: 900px) {
  .content {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}