:root {
  /* Typography */
  --app-font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --app-font-size: 16px;
  --app-line-height: 1.5;

  /* Palette */
  --app-bg: #f3f5f7;
  --app-surface: #ffffff;
  --app-ink1: #18222f;
  --app-ink2: #6b7a8c;
  --app-primary: #48a869;
  --app-primary-dark: #3b8b58;
  --app-accent: #f8c46c;
  --app-border: #e5e7eb;
  --app-danger: #d92d20;

  /* Radius & shadow */
  --app-radius-sm: 8px;
  --app-radius-md: 12px;
  --app-shadow: 0 4px 18px rgba(15, 23, 42, 0.08);
}

html {
  font-size: var(--app-font-size);
}

body {
  font-family: var(--app-font-family);
  line-height: var(--app-line-height);
  color: var(--app-ink1);
  background: var(--app-bg);
  margin: 0;
}

h1, h2, h3, h4 {
  font-family: inherit;
  color: var(--app-ink1);
}

p, label, span, small {
  font-family: inherit;
  font-size: 1rem;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: 1rem;
  line-height: var(--app-line-height);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem 1rem;
  border-radius: var(--app-radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border 0.2s ease;
  text-decoration: none;
}

.btn-sm {
  padding: 0.45rem 0.8rem;
  font-size: 0.9rem;
}

.btn-primary {
  background: var(--app-primary);
  color: #fff;
  border-color: var(--app-primary);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--app-primary-dark);
  border-color: var(--app-primary-dark);
}

.btn-danger {
  background: var(--app-danger);
  color: #fff;
  border-color: var(--app-danger);
}

.btn-danger:hover,
.btn-danger:focus-visible {
  background: #b4231a;
  border-color: #b4231a;
}

.btn-ghost {
  background: #fff;
  color: var(--app-ink1);
  border-color: var(--app-border);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(15, 23, 42, 0.04);
}

.input,
select,
textarea {
  border-radius: var(--app-radius-sm);
  border: 1px solid var(--app-border);
  padding: 0.55rem 0.65rem;
  background: #fff;
  color: var(--app-ink1);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(72, 168, 105, 0.25);
  outline-offset: 1px;
}

.alert {
  border-radius: var(--app-radius-sm);
  padding: 0.65rem 0.8rem;
  border: 1px solid transparent;
}

.alert-error {
  background: #fdecea;
  border-color: #f8c1bd;
  color: var(--app-danger);
}

.alert-success {
  background: #ecfdf3;
  border-color: #a6f4c5;
  color: #047857;
}

.nav-cta {
  background: var(--app-accent);
  color: #0f172a;
  border-radius: 999px;
  padding: 0.45rem 1.2rem;
  font-weight: 700;
  border: none;
  box-shadow: 0 6px 16px rgba(248, 196, 108, 0.35);
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: #f5b645;
  color: #0f172a;
}

.card {
  background: var(--app-surface);
  border-radius: var(--app-radius-md);
  border: 1px solid var(--app-border);
  box-shadow: var(--app-shadow);
  padding: 1.5rem;
}

.container {
  width: min(960px, 94vw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

a {
  color: inherit;
}

a:focus-visible {
  outline: 2px solid rgba(248, 196, 108, 0.65);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}