/* style.css - ExamPlanner: mobile first, tema chiaro/scuro automatico. */

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #cbd5e1;
  --primary: #1d4ed8;
  --primary-contrast: #ffffff;
  --danger: #b91c1c;
  --ok: #15803d;
  --late: #b45309;
  --focus: #d97706;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2e;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --border: #334155;
    --primary: #60a5fa;
    --primary-contrast: #0b1220;
    --danger: #f87171;
    --ok: #4ade80;
    --late: #fbbf24;
    --focus: #fbbf24;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.site-header,
main,
.site-footer {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
}

.site-header h1 {
  margin: 0;
  font-size: 1.75rem;
}

.site-header p {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

main {
  display: grid;
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
}

.field {
  margin-bottom: 0.75rem;
}

label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 600;
}

input[type="text"],
input[type="date"] {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.5rem 0.75rem;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

input[aria-invalid="true"] {
  border-color: var(--danger);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.error {
  min-height: 1.25rem;
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  color: var(--danger);
}

.btn {
  min-height: 2.75rem;
  padding: 0.5rem 1rem;
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  cursor: pointer;
}

.btn-primary {
  color: var(--primary-contrast);
  background: var(--primary);
  border-color: var(--primary);
}

.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
}

.status {
  min-height: 1.25rem;
  margin: 0.75rem 0 0;
  color: var(--ok);
}

.status.error {
  color: var(--danger);
}

.muted {
  color: var(--muted);
}

.list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.item:last-child {
  border-bottom: 0;
}

.item-info {
  display: grid;
  min-width: 0;
}

.item-title {
  overflow-wrap: anywhere;
}

.warning {
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  color: var(--late);
  border: 1px solid var(--late);
  border-radius: 0.5rem;
}

progress {
  width: 100%;
  height: 0.75rem;
  margin-bottom: 0.75rem;
}

.day {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.day-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.day.today .day-title {
  color: var(--primary);
}

.day.late .day-title {
  color: var(--late);
}

.sessions {
  margin: 0;
  padding: 0;
  list-style: none;
}

.session {
  margin-bottom: 0.25rem;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.75rem;
  margin: 0;
  font-weight: 400;
  cursor: pointer;
}

.check input {
  width: 1.5rem;
  height: 1.5rem;
  flex: none;
}

.session.done .check-text {
  color: var(--muted);
  text-decoration: line-through;
}

#toggle-plan {
  margin-top: 1rem;
}

.site-footer {
  padding-top: 0.5rem;
  padding-bottom: 2rem;
  font-size: 0.9rem;
  color: var(--muted);
}