:root {
  --green: #175d38;
  --gold: #d2a323;
  --navy: #10244a;
  --ink: #172033;
  --muted: #667085;
  --paper: #ffffff;
  --soft: #f4f7f6;
  --line: #dde5e0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #dfe8e3;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  width: min(100%, 430px);
  min-height: 100vh;
  margin: 0 auto;
  background: var(--soft);
  box-shadow: 0 0 40px rgba(16, 36, 74, 0.16);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.topbar img {
  width: 148px;
  height: 46px;
  object-fit: contain;
  object-position: left center;
}

.topbar button,
.modal form button {
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--green);
  font-weight: 800;
  cursor: pointer;
}

.topbar button {
  min-height: 38px;
  padding: 0 14px;
}

.intro {
  padding: 22px 18px 10px;
}

.intro p {
  margin: 0 0 8px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.intro h1 {
  margin: 0;
  color: var(--navy);
  font-size: 32px;
  line-height: 1.05;
  letter-spacing: 0;
}

.review-link,
.topbar a {
  display: inline-block;
  margin-top: 12px;
  color: var(--green);
  font-size: 14px;
  font-weight: 900;
  text-decoration: none;
}

.topbar a {
  margin-top: 0;
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 14px 16px;
  overflow-x: auto;
}

.tab {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font-weight: 800;
  cursor: pointer;
}

.tab.active {
  color: #fff;
  border-color: var(--navy);
  background: var(--navy);
}

.cards {
  display: grid;
  gap: 14px;
  padding: 0 14px 88px;
}

.brief-card {
  min-height: 560px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.brief-card .meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.topic {
  color: var(--green);
  text-transform: uppercase;
}

.brief-card h2 {
  margin: 22px 0 12px;
  color: var(--navy);
  font-size: 28px;
  line-height: 1.08;
  letter-spacing: 0;
}

.summary {
  color: #263548;
  font-size: 17px;
}

.why,
.learn-next {
  padding: 14px;
  background: #f7faf8;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.why strong,
.learn-next strong {
  display: block;
  margin-bottom: 6px;
  color: var(--green);
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.actions a,
.actions button {
  display: grid;
  min-height: 44px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  color: var(--navy);
  background: #fff;
  font-weight: 900;
  cursor: pointer;
}

.actions .primary {
  color: #fff;
  border-color: var(--green);
  background: var(--green);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: none;
  align-items: end;
  justify-content: center;
  padding: 16px;
  background: rgba(9, 22, 41, 0.52);
}

.modal.open {
  display: flex;
}

.modal-card {
  width: min(100%, 430px);
  position: relative;
  padding: 24px;
  background: #fff;
  border-radius: 8px;
}

.close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}

.modal h2 {
  margin: 0 38px 8px 0;
  color: var(--navy);
}

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

.modal form {
  display: grid;
  gap: 10px;
}

.modal input,
.modal form button {
  min-height: 48px;
  padding: 0 14px;
}

.modal input {
  border: 1px solid var(--line);
  border-radius: 8px;
}

.modal small {
  display: block;
  margin-top: 12px;
  color: var(--muted);
}