/* Deep Listening Training - โครงร่าง (ยังไม่ออกแบบสี/ฟอนต์) */

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans Thai", "Sarabun", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid #ddd;
}

.brand {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.lang-toggle {
  min-width: 56px;
  min-height: 44px;
  padding: 8px 14px;
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1px solid #999;
  border-radius: 8px;
  cursor: pointer;
}

.nav {
  display: flex;
  border-bottom: 1px solid #ddd;
}

.nav a {
  flex: 1;
  padding: 12px 8px;
  min-height: 44px;
  text-align: center;
  text-decoration: none;
  color: #444;
}

.nav a[aria-current="page"] {
  color: #000;
  font-weight: 600;
  border-bottom: 3px solid #222;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px 48px;
}

h2 { margin: 0 0 12px; font-size: 22px; }

.card {
  padding: 16px;
  border: 1px solid #ddd;
  border-radius: 10px;
  margin-bottom: 16px;
}

button, input, select, textarea {
  font: inherit;
}

.btn {
  display: inline-block;
  min-height: 48px;
  padding: 10px 18px;
  color: #fff;
  background: #222;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

.btn.secondary {
  color: #222;
  background: #fff;
  border: 1px solid #999;
}

input[type="text"], input[type="time"], input[type="password"], textarea {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid #999;
  border-radius: 8px;
}

.muted { color: #666; }

:focus-visible { outline: 3px solid #555; outline-offset: 2px; }