:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --ink: #152035;
  --muted: #5b677d;
  --line: #d8dfeb;
  --brand: #007a6f;
  --accent: #0f5bd7;
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% -10%, #dff7f3 0, transparent 38%),
    radial-gradient(circle at 92% 12%, #dce8ff 0, transparent 40%),
    var(--bg);
}

.app-shell {
  width: min(980px, 94vw);
  margin: 24px auto 42px;
  display: grid;
  gap: 14px;
}

.hero {
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
}

.hero p {
  margin: 4px 0 0;
  color: var(--muted);
}

.hero-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(150deg, var(--brand), var(--accent));
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: 0 5px 18px rgba(17, 33, 57, 0.08);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.join-grid {
  display: grid;
  grid-template-columns: 1fr 160px;
  gap: 10px;
}

label {
  display: grid;
  gap: 6px;
}

label span {
  color: var(--muted);
  font-size: 0.88rem;
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font: inherit;
  background: #fcfdff;
}

input:focus {
  outline: 2px solid color-mix(in srgb, var(--brand) 40%, white);
  border-color: var(--brand);
}

.full {
  grid-column: 1 / -1;
}

.actions {
  display: flex;
  gap: 8px;
}

.btn {
  border: 1px solid var(--line);
  background: #f7f9fd;
  color: var(--ink);
  padding: 10px 14px;
  border-radius: 12px;
  font: inherit;
  cursor: pointer;
}

.btn.primary {
  border-color: transparent;
  background: linear-gradient(140deg, var(--brand), var(--accent));
  color: #fff;
}

.hint,
.muted {
  color: var(--muted);
  font-size: 0.88rem;
}

.pill {
  background: #eef3ff;
  color: #23407a;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.79rem;
  font-weight: 600;
}

.session-meta {
  font-size: 0.93rem;
  color: var(--muted);
}

.track-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.track-subtitle {
  margin-top: 4px;
  color: var(--muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.chip {
  border-radius: 999px;
  background: #eef4f7;
  border: 1px solid #d6e0e6;
  padding: 4px 10px;
  font-size: 0.82rem;
}

.progress-wrap {
  margin-top: 10px;
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: #e7edf5;
  overflow: hidden;
}

.progress {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transition: width 240ms linear;
}

.log {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 220px;
  overflow: auto;
  display: grid;
  gap: 8px;
}

.log li {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.86rem;
  background: #fbfdff;
}

.log .error {
  border-color: #f0ccc6;
  background: #fff5f4;
  color: #85261e;
}

.offers {
  display: grid;
  gap: 8px;
}

.offer-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  display: grid;
  gap: 8px;
  background: #fbfdff;
}

.offer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.offer-title {
  font-weight: 600;
}

.offer-sub {
  color: var(--muted);
  font-size: 0.85rem;
}

.offer-progress-wrap {
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: #e7edf5;
  overflow: hidden;
}

.offer-progress {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--brand), var(--accent));
}

@media (max-width: 700px) {
  .join-grid {
    grid-template-columns: 1fr;
  }
}