* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #020617;
  color: #f1f5f9;
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.header {
  margin-bottom: 2.5rem;
}

.badge {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: #84cc16;
  margin: 0;
}

.header h1 {
  margin: 0.75rem 0 0;
  font-size: clamp(1.875rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: white;
}

.subtitle {
  margin: 1rem 0 0;
  max-width: 42rem;
  font-size: 1rem;
  color: #94a3b8;
}

@media (min-width: 640px) {
  .subtitle {
    font-size: 1.125rem;
  }
}

.grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 1024px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  border-radius: 1.5rem;
  border: 1px solid #1e293b;
  background: rgba(15, 23, 42, 0.7);
  padding: 1.5rem;
  box-shadow: 0 25px 50px -12px rgba(2, 6, 23, 0.25);
}

@media (min-width: 640px) {
  .card {
    padding: 2rem;
  }
}

.form {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.field h2,
.field label {
  font-size: 1.125rem;
  font-weight: 600;
  color: white;
}

.hint {
  font-size: 0.875rem;
  color: #94a3b8;
  margin: 0;
}

.goal-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

@media (max-width: 640px) {
  .goal-options {
    grid-template-columns: 1fr;
  }
}

.option {
  cursor: pointer;
  border-radius: 1rem;
  border: 1px solid #334155;
  padding: 1rem;
  background: rgba(2, 6, 23, 0.4);
  color: #cbd5e1;
  transition: border-color 0.15s, background 0.15s;
}

.option:hover {
  border-color: #64748b;
}

.option:has(input:checked) {
  border-color: #84cc16;
  background: rgba(132, 204, 22, 0.1);
  color: white;
}

.option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  clip: rect(0, 0, 0, 0);
}

.option span {
  font-size: 0.875rem;
  font-weight: 500;
}

.equipment-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

@media (max-width: 640px) {
  .equipment-options {
    grid-template-columns: 1fr;
  }
}

.checkbox {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: 1rem;
  border: 1px solid #334155;
  background: rgba(2, 6, 23, 0.4);
  cursor: pointer;
  transition: border-color 0.15s;
}

.checkbox:hover {
  border-color: #64748b;
}

.checkbox input {
  margin-top: 0.25rem;
  width: 1rem;
  height: 1rem;
  border-radius: 0.25rem;
  border-color: #475569;
  background: #0f172a;
  accent-color: #84cc16;
}

.checkbox span {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.checkbox strong {
  font-size: 0.875rem;
  color: white;
}

.checkbox em {
  font-size: 0.875rem;
  color: #94a3b8;
  font-style: normal;
}

select,
textarea {
  width: 100%;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  border: 1px solid #334155;
  background: rgba(2, 6, 23, 0.4);
  color: white;
  font-family: inherit;
  font-size: 1rem;
}

select:focus,
textarea:focus {
  outline: none;
  border-color: #84cc16;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

textarea::placeholder {
  color: #64748b;
}

button {
  width: 100%;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 1rem;
  border: none;
  background: #84cc16;
  color: #020617;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover:not(:disabled) {
  background: #a3e635;
}

button:disabled {
  cursor: not-allowed;
  background: #475569;
  color: #cbd5e1;
}

.result-header {
  margin-bottom: 1rem;
}

.result-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: white;
  margin: 0;
}

.error {
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  border: 1px solid rgba(244, 63, 94, 0.4);
  background: rgba(244, 63, 94, 0.1);
  color: #fecdd3;
  font-size: 0.875rem;
}

.explanation {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 1rem;
  border: 1px solid rgba(132, 204, 22, 0.3);
  background: rgba(132, 204, 22, 0.1);
}

.explanation h3 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #bef264;
  margin: 0 0 0.5rem;
}

.explanation p {
  font-size: 0.875rem;
  line-height: 1.5;
  color: #e2e8f0;
  margin: 0;
}

.empty {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 1rem;
  border: 1px dashed #334155;
  background: rgba(2, 6, 23, 0.3);
  color: #94a3b8;
  font-size: 0.875rem;
}

.workout-days {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.day-card {
  border-radius: 1rem;
  border: 1px solid #1e293b;
  background: rgba(2, 6, 23, 0.4);
  padding: 1.25rem;
}

.day-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: white;
  margin: 0 0 1rem;
}

.exercise-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.exercise-item {
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: #0f172a;
}

.exercise-item p {
  margin: 0;
  font-size: 0.875rem;
}

.exercise-item .name {
  font-weight: 500;
  color: #f1f5f9;
}

.exercise-item .meta {
  margin-top: 0.25rem;
  color: #94a3b8;
}