:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --line: #d6deeb;
  --text: #1f2a44;
  --muted: #5e6a84;
  --primary: #1f6feb;
  --ok: #1f9d55;
  --bad: #d93025;
  --warn: #b26a00;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background: radial-gradient(circle at 10% 0%, #e6eefc, #f8fbff 45%, #f3f5fa);
  color: var(--text);
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1rem;
}

.nav {
  background: #0f1b36;
  color: #fff;
}
.nav .container {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.nav-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.nav a, .nav button {
  color: #fff;
  text-decoration: none;
  border: 1px solid #2f4278;
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  background: transparent;
  cursor: pointer;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 6px 20px rgba(25, 35, 58, 0.05);
}

h1, h2, h3 { margin-top: 0; }
.small { color: var(--muted); font-size: 0.92rem; }
.pill-important {
  display: inline-block;
  margin-left: 0.35rem;
  font-size: 0.78rem;
  border: 1px solid #f5c66a;
  color: #7a4c00;
  background: #fff3d9;
  border-radius: 999px;
  padding: 0.08rem 0.42rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}
.stat {
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.8rem;
}

button, input, select {
  font: inherit;
}
button.primary {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
}
button.secondary {
  background: #eef3ff;
  border: 1px solid #c6d4f7;
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
}
a.secondary {
  display: inline-block;
  background: #eef3ff;
  border: 1px solid #c6d4f7;
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  color: var(--text);
  text-decoration: none;
}
button.ok { background: var(--ok); color: #fff; border: none; border-radius: 8px; padding: 0.45rem 0.7rem; }
button.bad { background: var(--bad); color: #fff; border: none; border-radius: 8px; padding: 0.45rem 0.7rem; }
button.warn { background: var(--warn); color: #fff; border: none; border-radius: 8px; padding: 0.45rem 0.7rem; }

label.choice {
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem;
  margin-bottom: 0.5rem;
}

.result-correct {
  background: #edfff4;
  border-left: 4px solid var(--ok);
  padding: 0.75rem;
}
.result-wrong {
  background: #fff1ef;
  border-left: 4px solid var(--bad);
  padding: 0.75rem;
}
.result-empty {
  background: #fff9ea;
  border-left: 4px solid var(--warn);
  padding: 0.75rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 0.5rem;
  font-size: 0.95rem;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.sessions-name-cell {
  min-width: 220px;
}

.sessions-name-form {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.sessions-name-input {
  min-width: 0;
  width: 100%;
}

.sessions-action-cell {
  display: flex;
  gap: 0.45rem;
  align-items: center;
  flex-wrap: wrap;
  min-width: 150px;
}

.flash { padding: 0.7rem; border-radius: 8px; margin-bottom: 1rem; }
.flash.error { background: #fff1ef; border: 1px solid #ffc8c3; }
.flash.info { background: #edf4ff; border: 1px solid #c8dcff; }

.md-content {
  line-height: 1.55;
}

.md-content > :first-child {
  margin-top: 0;
}

.md-content > :last-child {
  margin-bottom: 0;
}

.md-content code {
  background: #f3f6ff;
  border: 1px solid #dbe4fb;
  border-radius: 6px;
  padding: 0.08rem 0.3rem;
}

.md-content pre {
  overflow-x: auto;
  background: #f8faff;
  border: 1px solid #dbe4fb;
  border-radius: 8px;
  padding: 0.7rem;
}

.inline-md {
  display: inline;
}

.inline-md > p {
  display: inline;
  margin: 0;
}

.math-inline {
  display: inline;
}

.math-block {
  margin: 0.6rem 0;
}

@media (max-width: 700px) {
  .container { padding: 0.7rem; }

  .sessions-name-form {
    flex-direction: column;
    align-items: stretch;
  }
}