/* ============================================================
   Personal Financial Planning Scenario Planner — styles
   Plain CSS, no frameworks. Organized top-to-bottom:
   1. Design tokens & reset
   2. Layout & shared elements
   3. Form & scenario picker
   4. Results, chart, tables
   5. Tooltips, verdict, utilities
   6. Responsive & print
   ============================================================ */

/* ---------- 1. Design tokens & reset ---------- */
:root {
  /* Colors chosen for strong contrast (WCAG AA on white) */
  --blue: #2563eb;
  --blue-dark: #1e40af;
  --ink: #1f2937;          /* main text */
  --ink-soft: #4b5563;     /* secondary text */
  --bg: #f4f6fb;           /* page background */
  --panel: #ffffff;
  --border: #d4dae5;
  --good: #166534;         /* dark green text */
  --good-bg: #dcfce7;
  --warn: #92400e;
  --warn-bg: #fef3c7;
  --bad: #991b1b;
  --bad-bg: #fee2e2;

  /* Scenario line colors (also used in JS for the chart) */
  --c-conservative: #b45309;
  --c-moderate: #2563eb;
  --c-optimistic: #15803d;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

h1, h2, h3 { line-height: 1.25; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- 2. Layout & shared elements ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--blue-dark);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; }

.site-header {
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: #fff;
  padding: 2.25rem 0 2rem;
}
.site-header h1 { margin: 0 0 0.4rem; font-size: 1.9rem; }
.site-header .accent { color: #bfdbfe; }
.subtitle {
  margin: 0 0 0.5rem;
  color: #93c5fd;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tagline { margin: 0; color: #dbeafe; max-width: 46rem; }

.disclaimer {
  background: var(--warn-bg);
  border-bottom: 1px solid #f0d48a;
  color: var(--warn);
  padding: 0.75rem 0;
  font-size: 0.95rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.4rem 0;
}

.btn {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--blue-dark);
}
.btn-secondary {
  background: #fff;
  color: var(--blue-dark);
}
.btn-secondary:hover { background: #eff6ff; }
.btn:focus-visible,
input:focus-visible,
.tip:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(300px, 420px) 1fr;
  gap: 1.5rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

.panel {
  min-width: 0; /* let grid children shrink on small screens */
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}
.panel h2 { margin-top: 0; font-size: 1.35rem; }
.panel-intro { color: var(--ink-soft); margin-top: -0.4rem; }

.site-footer {
  background: #1f2937;
  color: #d1d5db;
  padding: 1.5rem 0;
  font-size: 0.9rem;
}

/* ---------- 3. Form & scenario picker ---------- */
fieldset {
  min-width: 0; /* fieldsets refuse to shrink below content width by default */
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1rem 0.5rem;
  margin: 0 0 1.25rem;
}
legend {
  font-weight: 700;
  padding: 0 0.4rem;
}
.fieldset-hint {
  margin: 0.1rem 0 0.9rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.field { margin-bottom: 1rem; }

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

input[type="number"] {
  width: 100%;
  font: inherit;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
input[type="number"][aria-invalid="true"] {
  border-color: var(--bad);
  background: #fff7f7;
}

.error-msg {
  margin: 0.25rem 0 0;
  min-height: 0;
  font-size: 0.875rem;
  color: var(--bad);
  font-weight: 600;
}

/* Scenario picker: radio buttons styled as cards, still keyboard friendly */
.scenario-picker {
  display: grid;
  gap: 0.6rem;
  margin-bottom: 1.1rem;
}
.scenario-option input[type="radio"] {
  /* Visually hidden but still focusable/announced */
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}
.scenario-card {
  display: block;
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.scenario-option input:checked + .scenario-card {
  border-color: var(--blue);
  background: #eff6ff;
}
.scenario-option input:focus-visible + .scenario-card {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}
.scenario-name { display: block; font-weight: 700; }
.scenario-desc { display: block; font-size: 0.85rem; color: var(--ink-soft); }

.assumption-note {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0.25rem 0 0.75rem;
}

/* ---------- 4. Results, chart, tables ---------- */
.verdict {
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
  font-size: 1.05rem;
  margin-bottom: 1.1rem;
  border: 1px solid transparent;
}
.verdict.good { background: var(--good-bg); color: var(--good); border-color: #86efac; }
.verdict.warn { background: var(--warn-bg); color: var(--warn); border-color: #fcd34d; }
.verdict.bad  { background: var(--bad-bg);  color: var(--bad);  border-color: #fca5a5; }

.result-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.8rem;
  margin-bottom: 0.9rem;
}
.result-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  background: #fafbfe;
}
.result-card h3 {
  margin: 0 0 0.3rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}
.result-value {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
}

.fine-detail { font-size: 0.9rem; color: var(--ink-soft); }

.chart-heading { margin: 1.6rem 0 0.6rem; font-size: 1.1rem; }

.chart-wrap {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem;
  background: #fff;
}
#chart { display: block; width: 100%; height: 320px; }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  margin-top: 0.5rem;
  color: var(--ink-soft);
}
.legend-item { display: inline-flex; align-items: center; gap: 0.4rem; }
.legend-swatch {
  width: 1.1rem; height: 0.35rem; border-radius: 2px; display: inline-block;
}

.data-details, .method-details { margin-top: 0.9rem; }
summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--blue-dark);
  padding: 0.3rem 0;
}

.table-scroll { overflow-x: auto; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
  margin-top: 0.5rem;
}
caption { text-align: left; color: var(--ink-soft); font-size: 0.85rem; padding-bottom: 0.4rem; }
th, td {
  text-align: right;
  padding: 0.45rem 0.7rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
th:first-child, td:first-child { text-align: left; }
thead th { border-bottom: 2px solid var(--ink-soft); }
tbody tr:nth-child(even) { background: #f8fafc; }

/* ---------- 5. Tooltips, utilities ---------- */
/* Tooltip: a small "?" button; the tip shows on hover AND keyboard focus. */
.tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.15rem;
  height: 1.15rem;
  margin-left: 0.25rem;
  border-radius: 50%;
  border: 1px solid var(--blue-dark);
  background: #eff6ff;
  color: var(--blue-dark);
  font-size: 0.72rem;
  font-weight: 700;
  cursor: help;
  vertical-align: middle;
}
.tip:hover::after,
.tip:focus-visible::after,
.tip.tip-open::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: 230px;
  background: var(--ink);
  color: #fff;
  font-weight: 400;
  font-size: 0.82rem;
  line-height: 1.45;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  z-index: 30;
  white-space: normal;
  text-align: left;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
}

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

/* ---------- 6. Responsive & print ---------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .site-header h1 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .result-cards { grid-template-columns: 1fr 1fr; }
  .tip:hover::after,
  .tip:focus-visible::after,
  .tip.tip-open::after {
    /* Keep tooltips on-screen on small phones */
    left: auto;
    right: -10px;
    transform: none;
    width: 200px;
  }
}

/* Print: hide interactive chrome, keep the numbers and tables */
@media print {
  .site-header { background: #fff; color: #000; }
  .site-header .accent, .tagline { color: #333; }
  .toolbar, .skip-link, .tip, .site-footer { display: none !important; }
  .panel { border: none; padding: 0.5rem 0; }
  .layout { display: block; }
  .disclaimer { border: 1px solid #999; }
  details { display: block; }
  details > *:not(summary) { display: block; }
  details summary { list-style: none; }
  body { background: #fff; }
}