:root {
  --bg: #f4f6fb;
  --bg-alt: #eef1f9;
  --card-bg: #ffffff;
  --card-bg-soft: #f3f5fa;
  --border: rgba(15, 23, 42, 0.09);
  --text: #1e293b;
  --text-dim: #64748b;
  --text-faint: #94a3b8;

  --blue: #3b82f6;
  --blue-dark: #2563eb;
  --green: #22c55e;
  --green-dark: #16a34a;
  --purple: #8b5cf6;
  --amber: #f59e0b;
  --teal: #14b8a6;
  --red: #ef4444;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(ellipse at top, var(--bg-alt) 0%, var(--bg) 55%);
  color: var(--text);
  padding-bottom: 24px;
  min-height: 100vh;
}

/* ================= HEADER ================= */
.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  background: linear-gradient(135deg, #ffffff, #eef2ff);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.brand-logo svg {
  width: 24px;
  height: 24px;
  color: #fff;
}

.brand-text h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.brand-white {
  color: var(--text);
}

.brand-accent {
  background: linear-gradient(90deg, var(--blue), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-text p {
  margin: 2px 0 0 0;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.tagline {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--blue);
  font-size: 0.78rem;
  font-style: italic;
  text-align: right;
  flex-shrink: 0;
}

.tagline svg {
  width: 26px;
  height: 26px;
  color: var(--green);
  flex-shrink: 0;
}

/* ================= LAYOUT ================= */
.dashboard {
  max-width: 1400px;
  margin: 0 auto;
  padding: 18px;
}

.top-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.top-grid > * {
  min-width: 0;
}

.bottom-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 18px;
}

.bottom-grid > .card {
  min-width: 0;
}

.right-column {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.details-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 960px) {
  .top-grid {
    grid-template-columns: minmax(340px, 420px) 1fr;
    align-items: start;
  }
  .bottom-grid {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }
  .details-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ================= CARD ================= */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
}

.card h2, .card h3 {
  margin: 0 0 14px 0;
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}

.card h3 {
  font-size: 0.92rem;
}

.card-icon {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-icon svg {
  width: 16px;
  height: 16px;
  color: #fff;
}

.card-icon.small {
  width: 26px;
  height: 26px;
}

.card-icon.small svg {
  width: 14px;
  height: 14px;
}

.icon-blue { background: linear-gradient(135deg, var(--blue), var(--blue-dark)); }
.icon-green { background: linear-gradient(135deg, var(--green), var(--green-dark)); }
.icon-purple { background: linear-gradient(135deg, #a78bfa, var(--purple)); }
.icon-amber { background: linear-gradient(135deg, #fbbf24, var(--amber)); }
.icon-teal { background: linear-gradient(135deg, #2dd4bf, var(--teal)); }
.icon-red { background: linear-gradient(135deg, #f87171, var(--red)); }

/* ================= FORM FIELDS ================= */
.field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 560px) {
  .field-grid, .sub-row {
    grid-template-columns: 1fr 1fr;
  }
}

.sub-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
}

.field-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.field-icon svg {
  width: 12px;
  height: 12px;
  color: #fff;
}

.field input[type="number"],
.field input[type="date"],
.field input[type="text"] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 0.92rem;
  background: var(--card-bg-soft);
  color: var(--text);
  width: 100%;
  font-family: inherit;
  color-scheme: light;
}

.field input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.field input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.input-suffix {
  position: relative;
  display: flex;
  align-items: center;
}

.input-suffix input {
  padding-right: 56px;
}

.input-suffix .suffix {
  position: absolute;
  right: 12px;
  font-size: 0.72rem;
  color: var(--text-faint);
  font-weight: 700;
  letter-spacing: 0.03em;
  pointer-events: none;
}

/* Pill toggle (Months / Years) */
.pill-toggle {
  display: flex;
  gap: 8px;
}

.pill {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--card-bg-soft);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.15s ease;
}

.pill input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.pill:has(input:checked) {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  border-color: var(--blue);
  color: #fff;
  font-weight: 600;
}

/* Quick select */
.quick-select {
  margin-top: 16px;
}

.quick-select > label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.quick-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.quick-btn {
  flex: 1;
  min-width: 50px;
  padding: 9px 6px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--card-bg-soft);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.quick-btn:hover {
  border-color: var(--blue);
  color: var(--text);
}

.quick-btn.active {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  border-color: var(--blue);
  color: #fff;
}

/* Action buttons */
.action-row {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.05s ease, opacity 0.15s ease, background 0.15s ease;
  font-family: inherit;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  flex: 1.3;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  color: #fff;
  box-shadow: 0 4px 14px rgba(34, 197, 94, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-outline {
  flex: 1;
  background: var(--card-bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--blue);
}

/* ================= SUMMARY ================= */
.summary-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.summary-header h2 {
  margin: 0;
  font-size: 1rem;
}

.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
}

.summary-card {
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.summary-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.15);
  margin-bottom: 4px;
}

.summary-icon svg {
  width: 18px;
  height: 18px;
  color: #fff;
}

.summary-title {
  font-size: 0.76rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.75);
}

.summary-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  word-break: break-word;
}

.summary-sub {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.6);
}

.summary-blue { background: linear-gradient(160deg, #1d4ed8, #1e3a8a); }
.summary-green { background: linear-gradient(160deg, #16a34a, #14532d); }
.summary-teal { background: linear-gradient(160deg, #0d9488, #115e59); }
.summary-purple { background: linear-gradient(160deg, #7c3aed, #4c1d95); }
.summary-amber { background: linear-gradient(160deg, #d97706, #78350f); }

/* ================= KEY DETAILS ================= */
.details-list {
  display: flex;
  flex-direction: column;
}

.details-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

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

.details-row .label {
  color: var(--text-dim);
}

.details-row .value {
  font-weight: 700;
  color: var(--text);
  text-align: right;
}

/* ================= HOW IT WORKS ================= */
.how-text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.55;
  margin: 0 0 14px 0;
}

.how-text strong {
  color: var(--text);
}

.formula-box {
  border: 1px solid rgba(59, 130, 246, 0.35);
  background: rgba(59, 130, 246, 0.08);
  border-radius: 12px;
  padding: 14px;
}

.formula {
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
  color: var(--blue);
  margin-bottom: 10px;
}

.formula-legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 14px;
  font-size: 0.74rem;
  color: var(--text-dim);
}

.formula-legend b {
  color: var(--text);
}

/* ================= ERROR ================= */
.error-box {
  background: rgba(239, 68, 68, 0.08);
  color: #b91c1c;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.88rem;
  margin-top: 18px;
}

/* ================= TABLE ================= */
.table-card h2 {
  margin-bottom: 12px;
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  max-height: 460px;
  overflow-y: auto;
}

table#results-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 1100px;
  font-size: 0.82rem;
}

table#results-table th,
table#results-table td {
  padding: 9px 10px;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

table#results-table th:nth-child(1),
table#results-table th:nth-child(2),
table#results-table td:nth-child(1),
table#results-table td:nth-child(2) {
  text-align: left;
}

table#results-table thead th {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 1;
}

table#results-table tbody tr:nth-child(even) {
  background: rgba(15, 23, 42, 0.025);
}

table#results-table tbody tr:hover {
  background: rgba(59, 130, 246, 0.08);
}

table#results-table tbody tr.row-final {
  background: rgba(34, 197, 94, 0.12);
  box-shadow: inset 3px 0 0 var(--green);
}

table#results-table td {
  color: var(--text);
}

table#results-table td:nth-child(1),
table#results-table td:nth-child(2) {
  color: var(--text-dim);
}

/* ================= CHART ================= */
.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.chart-header h2 {
  margin: 0;
}

.chart-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background: var(--card-bg-soft);
  border-radius: 9px;
  padding: 4px;
  border: 1px solid var(--border);
}

.chart-toggle-btn {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 7px 10px;
  border-radius: 7px;
  cursor: pointer;
}

.chart-toggle-btn.active {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
}

.chart-container {
  width: 100%;
  min-height: 280px;
}

.chart-container svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}

.chart-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 280px;
  color: var(--text-faint);
  font-size: 0.85rem;
}

/* ================= FOOTER ================= */
.footer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.footer-actions .btn-outline {
  flex: 0 0 auto;
}

.footer-tagline {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-tagline u {
  color: var(--green);
}

@media (max-width: 640px) {
  .app-header {
    flex-direction: column;
  }
  .tagline {
    text-align: left;
  }
  table#results-table {
    font-size: 0.78rem;
  }
}