:root {
  --primary: #FF8000;
  --primary-dark: #E96800;
  --primary-yellow: #FFB52E;
  --cream: #FFF9EC;
  --bg: #F8F6F0;
  --card: #FFFFFF;
  --border: #F2D9A0;
  --text: #202020;
  --muted: #747474;
  --success: #27834A;
  --error: #D93025;
  --focus: #202020;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(120, 70, 0, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  font-size: 15px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, p { margin: 0 0 0.6rem; }
h1 { font-size: 1.5rem; color: var(--primary-dark); }
h2 { font-size: 1.1rem; color: var(--text); }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary-dark);
  color: #fff;
  padding: 8px 12px;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- header ---------- */

.site-header {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary) 60%, var(--primary-yellow));
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 8px;
  background: var(--cream);
  color: var(--primary-dark);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 700; font-size: 1.2rem; }
.brand-tagline { font-size: 0.75rem; opacity: 0.95; }

.header-subtitle {
  margin: 0;
  font-size: 0.9rem;
  opacity: 0.95;
  border-left: 1px solid rgba(255, 255, 255, 0.6);
  padding-left: 12px;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  border-radius: 8px;
  padding: 6px;
  cursor: pointer;
}

.site-nav { margin-left: auto; }
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.site-nav a {
  display: block;
  color: #fff;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 500;
}
.site-nav a:hover { background: rgba(255, 255, 255, 0.18); }
.site-nav a[aria-current="page"] {
  background: var(--cream);
  color: var(--primary-dark);
}

/* ---------- layout ---------- */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 16px 32px;
  flex: 1;
}
main:focus { outline: none; }

.dash-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
.dash-main, .dash-side { min-width: 0; display: flex; flex-direction: column; gap: 16px; }

@media (min-width: 900px) {
  .dash-grid { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); align-items: start; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  min-width: 0;
}
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }

.welcome-card {
  background: var(--cream);
  border-left: 5px solid var(--primary);
}

.section-title { margin-top: 4px; color: var(--primary-dark); }

.muted { color: var(--muted); }
.small { font-size: 0.87rem; }

/* ---------- quick tiles ---------- */

.quick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
@media (min-width: 640px) {
  .quick-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.quick-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  background: var(--cream);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  min-height: 44px;
  transition: transform 0.1s, box-shadow 0.1s;
}
.quick-tile:hover { transform: translateY(-1px); box-shadow: var(--shadow); border-color: var(--primary-yellow); }
.tile-icon {
  color: var(--primary);
  display: inline-flex;
}

/* ---------- forms ---------- */

.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 14px; min-width: 0; }
.field.inline { flex-direction: row; align-items: center; gap: 12px; flex-wrap: wrap; }
label { font-weight: 600; font-size: 0.93rem; }
input, select {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  min-height: 44px;
  width: 100%;
  max-width: 100%;
}
input:focus, select:focus { border-color: var(--primary); }
input[aria-invalid="true"] { border-color: var(--error); background: #FFF5F4; }
.help { color: var(--muted); font-size: 0.85rem; margin: 0; }
.error { color: var(--error); font-size: 0.87rem; margin: 0; min-height: 0; }
.error:empty { display: none; }

.status-line { font-size: 0.93rem; margin-top: 6px; }
.status-line.ok { color: var(--success); font-weight: 600; }
.status-line.warn { color: var(--primary-dark); font-weight: 600; }
.status-line.error { color: var(--error); font-weight: 600; }

.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.btn {
  font: inherit;
  font-weight: 600;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-outline { background: #fff; color: var(--primary-dark); border-color: var(--primary); }
.btn-outline:hover:not(:disabled) { background: var(--cream); }
.btn-ghost { background: transparent; color: var(--primary-dark); border-color: var(--border); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.chip {
  font: inherit;
  min-height: 40px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--cream);
  border: 1px solid var(--border);
  color: var(--primary-dark);
  font-weight: 600;
  cursor: pointer;
}
.chip:hover { border-color: var(--primary); }

/* ---------- result ---------- */

.big-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin: 4px 0;
  overflow-wrap: anywhere;
}
.breakdown { margin-top: 10px; }
.breakdown p {
  margin: 0 0 6px;
  background: var(--cream);
  border-left: 3px solid var(--primary);
  padding: 6px 10px;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
.mono { font-family: Consolas, "Courier New", monospace; font-size: 0.9rem; }

.history-list { padding-left: 20px; margin: 8px 0 0; }
.history-list li { margin-bottom: 6px; overflow-wrap: anywhere; font-size: 0.9rem; }

/* ---------- progress ---------- */

.progress {
  position: relative;
  height: 18px;
  background: #F3ECDC;
  border: 1px solid var(--border);
  border-radius: 999px;
  margin: 14px 0 18px;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), var(--primary-yellow));
  border-radius: 999px;
  transition: width 0.3s;
}
.marker {
  position: absolute;
  top: -6px;
  bottom: -6px;
  width: 3px;
  margin-left: -1.5px;
  border-radius: 2px;
}
.marker-current { background: var(--text); }
.marker-target { background: var(--error); }

/* ---------- tables and chart ---------- */

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.scenario-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  font-size: 0.88rem;
}
.scenario-table th, .scenario-table td {
  padding: 8px 10px;
  border-bottom: 1px solid #F5EBCB;
  text-align: right;
  white-space: nowrap;
}
.scenario-table th:first-child, .scenario-table td:first-child { text-align: left; }
.scenario-table thead th { background: var(--cream); color: var(--primary-dark); }
.chart-wrap { margin-top: 12px; }
.chart-wrap svg { max-width: 100%; height: auto; }

/* ---------- footer ---------- */

.site-footer {
  background: var(--cream);
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}
.site-footer p { margin: 0; }

/* ---------- mobile menu ---------- */

@media (max-width: 860px) {
  .header-subtitle { display: none; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; }
  .site-nav {
    display: none;
    flex-basis: 100%;
    margin-left: 0;
  }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; gap: 2px; padding-bottom: 8px; }
  .site-nav a { padding: 10px 12px; }
}

@media (max-width: 360px) {
  .brand-tagline { display: none; }
  .big-number { font-size: 1.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}