:root {
  --blue-900: #0c4a6e;
  --blue-800: #0e5a85;
  --blue-700: #0f6f9e;
  --blue-100: #dceefb;
  --blue-050: #eef7fd;
  --white: #ffffff;

  --bg: #f3f7fb;
  --surface: #ffffff;
  --surface-2: #f7fafd;
  --border: #d4e2ef;
  --text: #0f2535;
  --text-soft: #4a6075;
  --text-faint: #738596;
  --brand: var(--blue-900);
  --brand-contrast: #ffffff;
  --best-bg: #e7f6ec;
  --best-border: #2f9e54;
  --best-text: #166534;
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --focus: #1d83c0;
  --shadow: 0 1px 2px rgba(12, 74, 110, .06), 0 8px 24px rgba(12, 74, 110, .07);
  --radius: 16px;
  --radius-sm: 10px;
}

[data-theme="dark"] {
  --bg: #08151f;
  --surface: #0f2433;
  --surface-2: #14303f;
  --border: #244355;
  --text: #e8f1f8;
  --text-soft: #a7c0d2;
  --text-faint: #7b97a9;
  --brand: #1788c6;
  --brand-contrast: #06141d;
  --blue-100: #173647;
  --blue-050: #122c3b;
  --best-bg: #11321f;
  --best-border: #2f9e54;
  --best-text: #7be0a0;
  --danger: #ff7a6b;
  --danger-soft: #2a1715;
  --focus: #4fb3ec;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  padding-bottom: env(safe-area-inset-bottom);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: var(--brand-contrast);
  padding: 10px 16px;
  z-index: 200;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* Header */
.app-header {
  background: linear-gradient(135deg, var(--blue-900), var(--blue-700));
  color: #fff;
  padding: calc(env(safe-area-inset-top) + 14px) 16px 14px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.app-header__inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  background: rgba(255, 255, 255, .14);
  border-radius: 12px;
  flex-shrink: 0;
}
.brand__text { min-width: 0; }
.brand__text h1 {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -.01em;
  overflow-wrap: break-word;
}
.brand__text p {
  margin: 2px 0 0;
  font-size: .8rem;
  opacity: .85;
  overflow-wrap: break-word;
}
.header-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* Buttons */
.btn {
  font: inherit;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  cursor: pointer;
  font-weight: 600;
  background: var(--surface);
  color: var(--text);
  transition: background .15s, border-color .15s, transform .05s, color .15s;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.btn--small { padding: 6px 11px; font-size: .82rem; }
.btn--ghost {
  background: rgba(255, 255, 255, .14);
  color: #fff;
  border-color: rgba(255, 255, 255, .3);
}
.btn--ghost:hover { background: rgba(255, 255, 255, .24); }
.card .btn--ghost {
  background: var(--surface-2);
  color: var(--brand);
  border-color: var(--border);
}
.card .btn--ghost:hover { background: var(--blue-050); }
.btn--icon {
  width: 44px; height: 44px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, .14);
  border-color: rgba(255, 255, 255, .3);
}
.theme-icon { width: 20px; height: 20px; display: inline-block; position: relative; }
.theme-icon::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: 50%;
  background: #fff;
  box-shadow: inset -5px -3px 0 0 var(--blue-700);
}
[data-theme="dark"] .theme-icon::before {
  background: #ffe08a;
  box-shadow: 0 0 0 2px rgba(255, 224, 138, .35);
}
.btn--danger {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: var(--danger);
}
.btn--danger:hover { background: var(--danger); color: #fff; }

/* Main */
.app-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 16px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card__head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.card__title {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: -.01em;
}
.card__title--small { font-size: .95rem; }
.card--note .card__title { color: var(--text-soft); }
.card__hint {
  margin: 0 0 14px;
  font-size: .86rem;
  color: var(--text-soft);
}
.card__hint--tight { margin: 8px 0 12px; font-size: .8rem; }

/* Fields */
.field { display: block; margin-bottom: 12px; }
.field:last-child { margin-bottom: 0; }
.field__label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-soft);
}
.field__input {
  width: 100%;
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text);
}
.field__input::placeholder { color: var(--text-faint); }
.field__input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
  border-color: var(--focus);
}
.field--inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.field--inline .field__label { margin-bottom: 0; }
.field__input--narrow { width: 130px; max-width: 45%; }

/* Quick chips */
.quick-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip {
  font: inherit;
  font-size: .82rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--blue-050);
  color: var(--brand);
  border-radius: 999px;
  padding: 7px 13px;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.chip:hover { background: var(--blue-100); }
.chip:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.chip.is-active {
  background: var(--brand);
  color: var(--brand-contrast);
  border-color: var(--brand);
}

/* Premium grid */
.premium-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.prem-cell {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.prem-cell__label {
  font-size: .8rem;
  font-weight: 700;
  color: var(--brand);
}
.prem-cell__row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.prem-cell__row .pfx { font-size: .78rem; color: var(--text-faint); }
.prem-cell input {
  width: 100%;
  font: inherit;
  font-size: .92rem;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}
.prem-cell input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
  border-color: var(--focus);
}
.prem-cell input.is-custom { border-color: var(--brand); }

/* Result */
.card--result .card__title { margin-bottom: 12px; }
.result-summary {
  background: var(--blue-050);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 14px;
  font-size: .92rem;
}
.result-summary strong { color: var(--brand); }
.result-summary.is-best {
  background: var(--best-bg);
  border-color: var(--best-border);
}
.result-summary.is-best strong { color: var(--best-text); }
.result-summary__big {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  margin-top: 4px;
}

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  min-width: 340px;
}
.result-table th,
.result-table td {
  padding: 11px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.result-table th {
  font-size: .76rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-faint);
  font-weight: 700;
}
.result-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.result-table tbody tr { transition: background .15s; }
.result-table tbody tr.is-best {
  background: var(--best-bg);
}
.result-table tbody tr.is-best td:first-child {
  border-left: 4px solid var(--best-border);
  font-weight: 700;
}
.result-table .franchise-cell {
  display: flex;
  align-items: center;
  gap: 7px;
}
.badge-best {
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .03em;
  background: var(--best-border);
  color: #fff;
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}
.total-strong { font-weight: 700; }

.explain {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}
.explain summary {
  cursor: pointer;
  font-weight: 600;
  font-size: .88rem;
  color: var(--brand);
}
.explain summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.explain__body { margin-top: 10px; font-size: .85rem; color: var(--text-soft); }
.explain__body p { margin: 0 0 8px; }
.legend-dot {
  display: inline-block;
  width: 11px; height: 11px;
  border-radius: 3px;
  vertical-align: middle;
}
.legend-dot--best { background: var(--best-border); }

.card--note { background: var(--surface-2); }
.disclaimer {
  font-size: .84rem;
  color: var(--text-soft);
  margin: 0 0 14px;
}

.app-footer {
  text-align: center;
  font-size: .78rem;
  color: var(--text-faint);
  padding: 8px 16px calc(env(safe-area-inset-bottom) + 18px);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal[hidden] { display: none; }
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 21, 31, .55);
  backdrop-filter: blur(2px);
}
.modal__dialog {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow);
  animation: pop .18s ease;
}
@keyframes pop { from { transform: scale(.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal__title { margin: 0 0 8px; font-size: 1.1rem; color: var(--brand); }
.modal__body { margin: 0 0 18px; color: var(--text-soft); font-size: .92rem; }
.modal__actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; }

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom) + 22px);
  transform: translateX(-50%) translateY(10px);
  background: var(--blue-900);
  color: #fff;
  padding: 12px 18px;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 600;
  box-shadow: var(--shadow);
  z-index: 320;
  opacity: 0;
  transition: opacity .2s, transform .2s;
  max-width: calc(100vw - 32px);
  text-align: center;
}
.toast.is-show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast[hidden] { display: none; }

/* Responsive */
@media (max-width: 460px) {
  .premium-grid { grid-template-columns: 1fr; }
  .brand__text h1 { font-size: 1.05rem; }
  .field__input--narrow { width: 110px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}