/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue-900: #1a365d;
  --blue-700: #2b6cb0;
  --blue-600: #2c5282;
  --blue-500: #3182ce;
  --blue-400: #4299e1;
  --blue-100: #ebf8ff;
  --blue-50:  #f0f7ff;
  --green-700: #276749;
  --green-600: #2f855a;
  --green-100: #f0fff4;
  --green-50:  #f0fff4;
  --red-600:  #c53030;
  --red-100:  #fff5f5;
  --amber-600:#d69e2e;
  --amber-100:#fffff0;
  --gray-900: #1a202c;
  --gray-700: #4a5568;
  --gray-600: #718096;
  --gray-400: #a0aec0;
  --gray-200: #e2e8f0;
  --gray-100: #edf2f7;
  --gray-50:  #f7fafc;
  --white:    #ffffff;
  --radius:   12px;
  --shadow:   0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);
  --shadow-lg:0 4px 6px rgba(0,0,0,0.07), 0 10px 24px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 60px 20px 50px;
  text-align: center;
  color: var(--white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg svg {
  width: 100%;
  height: 100%;
  display: block;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 0 auto;
}

.hero-icon {
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero .subtitle {
  font-size: 1.1rem;
  opacity: 0.85;
  line-height: 1.6;
}

/* ===== Main ===== */
main {
  max-width: 720px;
  margin: -20px auto 40px;
  padding: 0 16px;
  position: relative;
  z-index: 2;
}

/* ===== Cards ===== */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px 0;
}

.card-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--gray-900);
}

.step-number {
  width: 32px;
  height: 32px;
  background: var(--blue-500);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.card-body {
  padding: 20px 24px 24px;
}

/* ===== Form Fields ===== */
.field {
  margin-bottom: 18px;
}

.field:last-child {
  margin-bottom: 0;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray-700);
  margin-bottom: 6px;
}

.field label em {
  font-weight: 400;
  color: var(--gray-600);
}

.field input[type="number"],
.field input[type="text"],
.field select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--gray-900);
  background: var(--white);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--blue-400);
  box-shadow: 0 0 0 3px rgba(66,153,225,0.15);
}

.input-prefix {
  position: relative;
}

.input-prefix span {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-600);
  font-size: 1rem;
  font-weight: 500;
}

.input-prefix input {
  padding-left: 28px !important;
}

.hint {
  display: block;
  font-size: 0.8rem;
  color: var(--gray-600);
  margin-top: 4px;
}

/* Checkbox */
.checkbox-field {
  margin-top: 4px;
}

.checkbox-label {
  display: flex !important;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-weight: 400 !important;
  font-size: 0.95rem !important;
  color: var(--gray-900) !important;
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.checkmark {
  width: 22px;
  height: 22px;
  border: 2px solid var(--gray-400);
  border-radius: 5px;
  flex-shrink: 0;
  position: relative;
  transition: all 0.15s;
}

.checkbox-label input:checked + .checkmark {
  background: var(--blue-500);
  border-color: var(--blue-500);
}

.checkbox-label input:checked + .checkmark::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: solid var(--white);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Messages */
.message {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-top: 14px;
  line-height: 1.5;
}

.message.info    { background: var(--blue-100); color: var(--blue-600); border-left: 3px solid var(--blue-500); }
.message.warning { background: var(--amber-100); color: #744210; border-left: 3px solid var(--amber-600); }
.message.success { background: var(--green-100); color: var(--green-700); border-left: 3px solid var(--green-600); }
.message.error   { background: var(--red-100); color: var(--red-600); border-left: 3px solid var(--red-600); }

.hidden { display: none !important; }

/* ===== Button ===== */
.actions {
  text-align: center;
  margin-bottom: 24px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
  color: var(--white);
  border: none;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(49,130,206,0.3);
  transition: transform 0.1s, box-shadow 0.15s;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(49,130,206,0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

/* ===== Results ===== */
.results-card {
  border: 2px solid var(--blue-400);
}

.result-icon {
  background: var(--green-600) !important;
}

.result-section {
  margin-bottom: 20px;
}

.comparison-heading {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 14px;
  padding-top: 8px;
  border-top: 1px solid var(--gray-200);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

@media (max-width: 560px) {
  .comparison-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.6rem; }
  .hero { padding: 40px 16px 36px; }
}

.option-card {
  border: 1.5px solid var(--gray-200);
  border-radius: 10px;
  overflow: hidden;
}

.option-header {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.option-header h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.trad-header {
  background: var(--blue-50);
  color: var(--blue-700);
}

.roth-header {
  background: var(--green-50);
  color: var(--green-700);
}

.tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(0,0,0,0.08);
}

.option-body {
  padding: 16px;
}

.metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  border-bottom: 1px solid var(--gray-100);
}

.metric:last-of-type {
  border-bottom: none;
}

.metric-label {
  font-size: 0.85rem;
  color: var(--gray-600);
}

.metric-value {
  font-weight: 700;
  font-size: 1rem;
}

.metric.highlight {
  margin-top: 4px;
  padding-top: 8px;
  border-top: 2px solid var(--gray-200);
  border-bottom: none;
}

.metric.highlight .metric-value {
  font-size: 1.15rem;
  color: var(--blue-700);
}

.option-note {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--gray-600);
  line-height: 1.5;
}

/* Tax Table */
.tax-detail-section {
  margin-bottom: 20px;
}

.tax-detail-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--gray-200);
}

.tax-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.tax-table th {
  text-align: left;
  padding: 8px 10px;
  background: var(--gray-100);
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tax-table th:last-child,
.tax-table td:last-child {
  text-align: right;
}

.tax-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

.tax-table tfoot td {
  font-weight: 700;
  color: var(--gray-900);
  border-top: 2px solid var(--gray-200);
  border-bottom: none;
  padding-top: 10px;
}

/* Recommendation */
.recommendation-box {
  padding: 16px 20px;
  border-radius: 10px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.recommendation-box.favor-trad {
  background: var(--blue-100);
  border-left: 4px solid var(--blue-500);
}

.recommendation-box.favor-roth {
  background: var(--green-100);
  border-left: 4px solid var(--green-600);
}

.recommendation-box.neutral {
  background: var(--gray-100);
  border-left: 4px solid var(--gray-400);
}

.recommendation-box strong {
  display: block;
  margin-bottom: 4px;
}

.info-card .recommendation-box {
  margin-bottom: 24px;
}

/* ===== Info Card ===== */
.info-card {
  padding: 24px;
  margin-top: 8px;
}

.info-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--gray-900);
}

.info-grid {
  display: grid;
  gap: 18px;
}

.info-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.info-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--blue-50);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-item strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.info-item p {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.5;
}

/* ===== Future Value ===== */
.fv-note {
  font-size: 0.88rem;
  color: var(--gray-600);
  margin-bottom: 14px;
}

.fv-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  margin-bottom: 14px;
}

@media (max-width: 560px) {
  .fv-grid { grid-template-columns: 1fr; }
  .fv-or { padding: 4px 0; }
}

.fv-card {
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}

.fv-trad {
  background: var(--blue-50);
  border: 1.5px solid var(--blue-400);
}

.fv-roth {
  background: var(--green-50);
  border: 1.5px solid var(--green-600);
}

.fv-or {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.fv-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 4px;
}

.fv-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
}

.fv-status {
  font-size: 1.3rem;
  font-weight: 700;
  margin-top: 4px;
}

.fv-status-taxable {
  color: var(--red-600);
}

.fv-status-free {
  color: var(--green-600);
}

.fv-tax {
  font-size: 0.8rem;
  margin-top: 6px;
  color: var(--gray-600);
  font-style: italic;
}

.fv-detail {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* ===== Roth Summary ===== */
.roth-summary {
  margin-bottom: 16px;
}

.summary-line {
  font-size: 0.95rem;
  color: var(--gray-700);
  padding: 4px 0;
}

.summary-main {
  font-size: 1.1rem;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.summary-tax {
  color: var(--red-600);
  font-size: 0.95rem;
  font-weight: 600;
}

.summary-tax-muted {
  color: var(--gray-600);
  font-size: 0.95rem;
  font-weight: 600;
}

.tax-details {
  margin-bottom: 20px;
}

.tax-details summary {
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--blue-500);
  font-weight: 600;
  padding: 6px 0;
  user-select: none;
}

.tax-details summary:hover {
  color: var(--blue-700);
}

.tax-details[open] summary {
  margin-bottom: 8px;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 24px 16px 40px;
  font-size: 0.8rem;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}