/* ---- box model foundations ---- */
* {
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  margin: 0;
  background: #f4f6f8;
  color: #1e2530;
}

header {
  background: #10243e;
  color: #ffffff;
  padding: 16px 24px;
}

header h1 {
  margin: 0 0 8px 0;
  font-size: 1.6rem;
}

nav a {
  color: #a9c4e4;
  margin-right: 16px;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

/* ---- error banner (hidden until .visible is toggled by app.js) ---- */
#error-banner {
  display: none;
  background: #fdecea;
  border: 2px solid #c0392b;
  color: #8e2418;
  padding: 12px 16px;
  margin: 16px 24px;
  border-radius: 6px;
  font-weight: 600;
}

#error-banner.visible {
  display: block;
}

/* ---- roster container: explicit padding, margin, visible border ---- */
#roster-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  padding: 20px;
  margin: 24px;
  border: 2px solid #33415c;
  border-radius: 8px;
  background: #ffffff;
}

/* ---- each student card: explicit padding, margin, visible border ---- */
.student-card {
  padding: 14px;
  margin: 4px;
  border: 1px solid #7d8ba1;
  border-radius: 6px;
  background: #fbfcfe;
}

.student-card h3 {
  margin: 0 0 6px 0;
}

.student-card p {
  margin: 4px 0;
}

.student-card .age-input {
  width: 70px;
  padding: 4px;
  margin-right: 8px;
}

.student-card button {
  margin: 6px 6px 0 0;
}

/* ---- forms / AI helper ---- */
#add-student,
#ai-helper {
  padding: 20px;
  margin: 24px;
  border: 2px solid #33415c;
  border-radius: 8px;
  background: #ffffff;
}

#student-form label {
  display: block;
  margin-top: 10px;
  font-weight: 600;
}

#student-form input {
  padding: 8px;
  margin-top: 4px;
  width: 100%;
  max-width: 320px;
  border: 1px solid #9aa7b8;
  border-radius: 4px;
}

button {
  margin-top: 12px;
  padding: 8px 16px;
  background: #10243e;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #1d3a63;
}

.ai-block {
  padding: 12px;
  margin: 12px 0;
  border: 1px dashed #7d8ba1;
  border-radius: 6px;
}

#notes-input,
#note-query {
  width: 100%;
  max-width: 560px;
  padding: 8px;
  border: 1px solid #9aa7b8;
  border-radius: 4px;
  display: block;
}

#summary-result {
  margin-top: 12px;
}

#search-results li {
  margin: 6px 0;
}

.score-badge {
  font-weight: 700;
  color: #10243e;
}

.ai-block .hint {
  font-size: 0.85rem;
  color: #5b6a7f;
  margin: 4px 0 8px 0;
}

#notes-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0 0;
}

#notes-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  margin: 4px 0;
  border: 1px solid #d7dde6;
  border-radius: 4px;
  background: #fbfcfe;
}

#notes-list li button {
  margin-top: 0;
  flex-shrink: 0;
}

footer {
  padding: 16px 24px;
  color: #5b6a7f;
}

/* ---- responsive: single column below 600px ---- */
@media (max-width: 600px) {
  #roster-list {
    grid-template-columns: 1fr;
  }
}