.app-shell {
  max-width: 720px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 24px;
}

.topbar h1,
.results-panel h2,
.modal-header h2 {
  margin: 0;
}

.topbar h1,
.results-panel h2,
.section-title,
.result-value,
.grid-header,
.modal-header h2 {
  color: var(--accent);
}

.topbar p,
label,
.result-label,
.next-cost,
.grid-row .total-col {
  color: var(--muted);
}

.topbar p {
  margin: 8px 0 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}

.nav-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.calc-panel,
.results-panel,
.modal-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 12px 28px var(--shadow);
}

.calc-panel,
.results-panel {
  padding: 24px;
}

.modal-card {
  width: min(620px, calc(100vw - 32px));
  padding: 16px;
}

.form-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: 700;
}

input[type="number"] {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-soft);
  color: var(--text);
  font-size: 16px;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: var(--accent-contrast);
  border: 1px solid var(--accent);
  border-radius: 10px;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 10px;
}

button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.button-row {
  display: flex;
  gap: 10px;
}

.button-row button {
  flex: 1;
}

#clearBtn,
.helper-toggle,
.modal-close {
  background: var(--panel-alt);
  color: var(--text);
  border-color: var(--border);
}

#clearBtn:hover,
.helper-toggle:hover,
.modal-close:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.helper-wrap {
  margin-bottom: 18px;
}

.helper-toggle {
  width: auto;
  min-width: 120px;
  padding: 9px 14px;
  margin-top: 0;
  font-size: 15px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(6, 10, 20, 0.72);
  z-index: 1000;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.modal-card .form-group label {
  font-size: 0.82rem;
}

.modal-card .level-inputs {
  gap: 8px;
  margin-bottom: 16px;
}

#submitTotalHelperBtn {
  margin-top: 0;
}

.modal-close {
  width: auto;
  min-width: 44px;
  padding: 8px 12px;
  margin-top: 0;
  font-size: 15px;
}

.ratio-inputs,
.level-inputs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.ratio-inputs .form-group,
.level-inputs .form-group {
  margin-bottom: 0;
}

.ratio-inputs input,
.level-inputs input {
  text-align: center;
}

.level-inputs {
  margin-bottom: 20px;
}

.results-panel {
  margin-top: 30px;
  display: none;
}

.results-panel.visible {
  display: block;
}

.results-panel h2 {
  margin-top: 0;
}

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.result-row:last-child {
  border-bottom: none;
}

.result-value {
  font-weight: 700;
}

.next-cost {
  font-weight: 400;
  font-size: 0.9em;
}

.total-row {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 2px solid var(--accent);
}

.section-title {
  margin: 20px 0 10px;
  font-size: 14px;
  text-transform: uppercase;
}

.upgrades-grid {
  background: var(--bg);
  border-radius: 10px;
  overflow: hidden;
}

.grid-header,
.grid-row {
  display: grid;
  grid-template-columns: 80px repeat(auto-fit, minmax(50px, 1fr));
  gap: 5px;
  padding: 8px 10px;
}

.grid-header {
  background: var(--panel-soft);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
}

.grid-row {
  border-bottom: 1px solid var(--border);
}

.grid-row:last-child {
  border-bottom: none;
}

.grid-row span {
  text-align: center;
}

.grid-row .total-col {
  text-align: left;
}

.grid-row .upgraded {
  color: var(--accent);
  font-weight: 700;
}

@media (max-width: 760px) {
  .topbar {
    flex-direction: column;
  }

  .ratio-inputs,
  .level-inputs,
  .button-row {
    grid-template-columns: 1fr;
    display: grid;
  }
}