:root {
  --bg: #f2f5f9;
  --surface: #ffffff;
  --ink: #1a2733;
  --ink-soft: #3a4b5b;
  --line: #c7d5e2;
  --brand: #0f5d8f;
  --focus: #0b63a5;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 46, 74, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at top right, #deebf6 0%, var(--bg) 52%);
  color: var(--ink);
  font-family: "Source Serif 4", "Palatino Linotype", "Book Antiqua", Palatino, serif;
  line-height: 1.45;
}

a {
  color: var(--brand);
}

.container {
  width: min(1280px, 96vw);
  margin: 0 auto;
  padding: 18px 0 24px;
}

.container.wide {
  width: min(2400px, 99vw);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
  margin-bottom: 12px;
}

.topbar h1 {
  margin: 0;
  color: #164969;
  font-size: clamp(1.32rem, 2.8vw, 1.96rem);
}

.topbar a {
  text-decoration: none;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 0.92rem;
}

.mode-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 8px;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.mode-nav a {
  display: inline-block;
  border: 1px solid #b5cada;
  border-radius: 999px;
  background: #f4f9fd;
  color: #205373;
  text-decoration: none;
  padding: 6px 10px;
  font-size: 0.84rem;
  font-weight: 700;
}

.mode-nav a.active {
  background: var(--brand);
  border-color: #0c4f79;
  color: #fff;
}

.note {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

.controls {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 10px;
  margin-bottom: 12px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.controls.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.controls.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.controls label {
  display: grid;
  gap: 4px;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.controls input,
.controls select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

.controls button {
  align-self: end;
  justify-self: start;
  border: 1px solid #0c4f79;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font: 700 0.88rem "Trebuchet MS", "Segoe UI", sans-serif;
  padding: 8px 12px;
  cursor: pointer;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.grid.one-up {
  grid-template-columns: 1fr;
}

.grid.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.four-up {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  padding: 10px;
  display: flex;
  flex-direction: column;
}

.panel h2 {
  margin: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: #1a4d6e;
  font-size: 0.95rem;
  background: #f7fbff;
}

iframe {
  width: 100%;
  height: 640px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  margin-top: 8px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.6);
}

.landing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.landing-grid.four-up {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.landing-grid.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 12px;
}

.landing-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 13px;
}

.landing-card h2 {
  margin: 0 0 6px;
  color: #1a4d6e;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 1rem;
}

.landing-card p {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 0.92rem;
}

.landing-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 0.9rem;
  display: grid;
  gap: 5px;
}

.landing-card a {
  display: inline-block;
  border: 1px solid #0c4f79;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  padding: 7px 11px;
  font: 700 0.84rem "Trebuchet MS", "Segoe UI", sans-serif;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

@media (max-width: 1120px) {
  .controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-grid.four-up {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .controls.three-up,
  .controls.two-up {
    grid-template-columns: 1fr;
  }
}