:root {
  --text: #2C2C2B;
  --muted: #7D7A75;
  --border: #E6E5E3;
  --surface: #F9F8F7;
  --accent: #2783DE;
  --brand: #005CA9;
  --accent-soft: #E5F2FC;
  --ok: #46A171;
  --warn: #D5803B;
  --err: #E56458;
  --err-soft: #FCE9E7;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--surface);
  font-size: 16px;
  line-height: 1.5;
}
.wrap { max-width: 440px; margin: 0 auto; padding: 48px 24px; }
.brand { text-align: center; margin-bottom: 24px; }
.logo { width: 64px; height: 64px; border-radius: 12px; box-shadow: 0 1px 2px rgba(0,0,0,.08); }
h1 { font-size: 24px; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 0 0 8px; }
.sub, .muted { color: var(--muted); margin: 0 0 8px; font-size: 14px; }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 12px rgba(0,0,0,.04);
}
label { display: block; margin: 16px 0 0; font-size: 14px; font-weight: 600; }
input, select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
button {
  width: 100%;
  margin-top: 24px;
  padding: 12px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  min-height: 44px;
}
button:hover { filter: brightness(.95); }
.alert {
  background: var(--err-soft);
  color: #8f2f26;
  border: 1px solid var(--err);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 14px;
}
footer { text-align: center; margin-top: 24px; font-size: 13px; color: var(--muted); }
footer a { color: var(--accent); text-decoration: none; }
footer p { margin-top: 8px; }
.channels { list-style: none; padding: 0; margin: 8px 0 16px; }
.channels li {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  display: flex;
  gap: 8px;
  align-items: center;
}
.tag {
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  border-radius: 6px;
  padding: 2px 8px;
}
.ok { color: var(--ok); font-size: 13px; margin-left: auto; }
.warn { color: var(--warn); font-size: 13px; margin-left: auto; }
.radio {
  font-weight: 400;
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 8px;
  cursor: pointer;
}
.radio input { width: auto; display: inline; margin: 0; }
.success-title { color: var(--ok); }
.menu { display: block; margin-top: 8px; }
.menu-btn {
  display: block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  text-align: center;
  font-weight: 600;
  font-size: 16px;
  padding: 16px;
  border-radius: 4px;
  margin-top: 12px;
  min-height: 44px;
}
.menu-btn:hover { filter: brightness(1.12); }

/* Campus photo background */
body {
  background: url('background.jpg') no-repeat center center fixed;
  background-size: cover;
}
.brand,
footer {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  border-radius: 12px;
  padding: 16px;
}
footer { margin-top: 24px; text-align: center; }