/* ============================================================
   Art direction: UK personal tax dashboard
   Palette: warm neutral surfaces, teal primary accent
   Typography: Instrument Sans — clean, professional
   Layout: page-wide rows, 2-col inputs, responsive stacking
   ============================================================ */

/* ── TOKENS ─────────────────────────────────────────────── */
:root, [data-theme="light"] {
  --color-bg:               #f4f3ef;
  --color-surface:          #f9f8f5;
  --color-surface-2:        #ffffff;
  --color-surface-offset:   #eeece8;
  --color-divider:          #dcdad5;
  --color-border:           #d2cfc8;
  --color-text:             #26231c;
  --color-text-muted:       #68675f;
  --color-text-faint:       #a6a49f;
  --color-text-inverse:     #f9f8f4;
  --color-primary:          #01696f;
  --color-primary-hover:    #0c4e54;
  --color-primary-light:    #e2f0ef;
  --color-success:          #437a22;
  --color-success-bg:       #edf5e7;
  --color-warning:          #964219;
  --color-warning-bg:       #fdf3eb;
  --color-error:            #a12c7b;
  --color-error-bg:         #faeef6;
  --color-info:             #006494;
  --color-info-bg:          #e6f2f9;

  --shadow-sm:  0 1px 3px oklch(0.2 0.01 80 / 0.07);
  --shadow-md:  0 4px 14px oklch(0.2 0.01 80 / 0.09);

  --radius-sm:  0.375rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;

  --space-1:  0.25rem;  --space-2:  0.5rem;   --space-3:  0.75rem;
  --space-4:  1rem;     --space-5:  1.25rem;  --space-6:  1.5rem;
  --space-8:  2rem;     --space-10: 2.5rem;   --space-12: 3rem;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.2vw,  0.875rem);
  --text-sm:   clamp(0.8125rem,0.77rem + 0.3vw,  0.9375rem);
  --text-base: clamp(0.9375rem,0.88rem + 0.3vw,  1.0625rem);
  --text-lg:   clamp(1.0625rem,0.95rem + 0.5vw,  1.25rem);
  --text-xl:   clamp(1.25rem,  1.1rem  + 0.75vw, 1.5rem);

  --font-body: 'Instrument Sans', 'Helvetica Neue', sans-serif;
  --transition: 160ms cubic-bezier(0.16, 1, 0.3, 1);
  --page-max:  1400px;
  --page-pad:  clamp(var(--space-4), 3vw, var(--space-8));
}

[data-theme="dark"] {
  --color-bg:               #161513;
  --color-surface:          #1d1c1a;
  --color-surface-2:        #232220;
  --color-surface-offset:   #1a1917;
  --color-divider:          #2b2a28;
  --color-border:           #353432;
  --color-text:             #d2d1ce;
  --color-text-muted:       #787672;
  --color-text-faint:       #4d4c4a;
  --color-text-inverse:     #26231c;
  --color-primary:          #4f98a3;
  --color-primary-hover:    #227f8b;
  --color-primary-light:    #1c3535;
  --color-success:          #6daa45;
  --color-success-bg:       #1c2e16;
  --color-warning:          #bb653b;
  --color-warning-bg:       #2c1c10;
  --color-error:            #d163a7;
  --color-error-bg:         #2b1424;
  --color-info:             #5591c7;
  --color-info-bg:          #111f2e;
  --shadow-sm:  0 1px 3px oklch(0 0 0 / 0.28);
  --shadow-md:  0 4px 14px oklch(0 0 0 / 0.38);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:#161513; --color-surface:#1d1c1a; --color-surface-2:#232220;
    --color-surface-offset:#1a1917; --color-divider:#2b2a28; --color-border:#353432;
    --color-text:#d2d1ce; --color-text-muted:#787672; --color-text-faint:#4d4c4a;
    --color-text-inverse:#26231c; --color-primary:#4f98a3; --color-primary-hover:#227f8b;
    --color-primary-light:#1c3535; --color-success:#6daa45; --color-success-bg:#1c2e16;
    --color-warning:#bb653b; --color-warning-bg:#2c1c10; --color-error:#d163a7;
    --color-error-bg:#2b1424; --color-info:#5591c7; --color-info-bg:#111f2e;
    --shadow-sm:0 1px 3px oklch(0 0 0/.28); --shadow-md:0 4px 14px oklch(0 0 0/.38);
  }
}

/* ── RESET ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}
img, svg { display: block; max-width: 100%; }
input, button, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
a, button, input, select, textarea {
  transition: color var(--transition), background var(--transition),
              border-color var(--transition), box-shadow var(--transition);
}

/* ── SKIP LINK ──────────────────────────────────────────── */
.skip-link {
  position: absolute; top: -100%; left: var(--space-4);
  background: var(--color-primary); color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
  font-weight: 600; z-index: 999; text-decoration: none;
}
.skip-link:focus { top: var(--space-4); }

/* ── HEADER ─────────────────────────────────────────────── */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-3) var(--page-pad);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-3);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow-sm);
}
.brand-wrap { display: flex; align-items: center; gap: var(--space-3); }
.brand-mark svg { width: 34px; height: 34px; color: var(--color-primary); flex-shrink: 0; }
.eyebrow {
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--color-primary); margin-bottom: 1px;
}
.site-header h1 {
  font-size: var(--text-base); font-weight: 700; line-height: 1.2;
}
.subtitle { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 1px; }

.header-actions {
  display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap;
}
.year-select-wrap {
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted);
}
.year-select-wrap select {
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs); font-weight: 600; cursor: pointer;
}
.year-select-wrap select:hover { border-color: var(--color-primary); }

.profile-switcher { display: flex; gap: var(--space-1); }
.profile-tab {
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
  font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted);
  border: 1px solid transparent; min-height: 36px;
}
.profile-tab:hover { background: var(--color-surface-offset); color: var(--color-text); }
.profile-tab.is-active {
  background: var(--color-primary-light); color: var(--color-primary);
  border-color: oklch(from var(--color-primary) l c h / 0.25);
}
.theme-toggle {
  width: 36px; height: 36px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted); border: 1px solid var(--color-border);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

/* ── PAGE LAYOUT ─────────────────────────────────────────── */
.page-main {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: var(--page-pad);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* Each row is a horizontal layout */
.layout-row {
  display: grid;
  gap: var(--space-6);
}

/* Row 1: inputs (wider) + results tiles */
.row-inputs {
  grid-template-columns: 1fr 1fr;
}

/* Row 2: rules (narrower) + breakdown */
.row-breakdown {
  grid-template-columns: 340px 1fr;
}

/* Row 3 & 4: full width */
.row-single {
  grid-template-columns: 1fr;
}

/* Responsive: stack everything at ≤900px */
@media (max-width: 900px) {
  .row-inputs,
  .row-breakdown {
    grid-template-columns: 1fr;
  }
}

/* ── PANELS ──────────────────────────────────────────────── */
.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.full-panel { width: 100%; }

.panel-head {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface-offset);
}
.panel-head h2 {
  font-size: var(--text-base); font-weight: 700;
}
.panel-head p {
  font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 2px;
}

/* ── FORM ────────────────────────────────────────────────── */
.tax-form {
  padding: var(--space-4) var(--space-5);
}

/* 2-column form grid: income left, pensions/options right */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: start;
}
@media (max-width: 600px) {
  .form-grid { grid-template-columns: 1fr; }
}

.form-right-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-section {
  border: none; padding: 0; margin: 0;
}
.form-section + .form-section {
  margin-top: var(--space-5);
}
.form-right-col .form-section + .form-section {
  margin-top: 0;
}

.form-section legend {
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--color-primary);
  padding-bottom: var(--space-2); margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider); width: 100%;
  float: left;
}
.form-section legend + * { clear: both; }

.form-section label {
  display: flex; flex-direction: column; gap: 3px;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted);
}
.form-section label:last-child { margin-bottom: 0; }
.form-section label small {
  font-weight: 400; color: var(--color-text-faint); line-height: 1.4;
}
.form-section input[type="number"],
.form-section select,
.form-section textarea {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm); color: var(--color-text); width: 100%;
}
.form-section input[type="number"]:focus,
.form-section select:focus,
.form-section textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.14);
  outline: none;
}
.form-section textarea { resize: vertical; }
.checkbox-row {
  flex-direction: row !important;
  align-items: center !important;
  gap: var(--space-2) !important;
  cursor: pointer;
}
.checkbox-row input[type="checkbox"] {
  width: 15px; height: 15px;
  accent-color: var(--color-primary); cursor: pointer; flex-shrink: 0;
}

/* ── RESULTS SUMMARY TILES ───────────────────────────────── */
.results-summary {
  display: grid;
  /* Uniform width: 4 per row on wide, 2 on medium, 1 on mobile */
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
}
@media (min-width: 1200px) {
  .results-summary {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-sm);
  /* Uniform height: stretch all cards in the same row */
  display: flex; flex-direction: column;
}
.metric-label {
  display: block; font-size: var(--text-xs); font-weight: 600;
  color: var(--color-text-muted); text-transform: uppercase;
  letter-spacing: 0.06em; margin-bottom: var(--space-1);
}
.metric-value {
  font-size: var(--text-lg); font-weight: 700; color: var(--color-text);
  font-variant-numeric: tabular-nums lining-nums;
  flex: 1;
}
.metric-detail {
  font-size: var(--text-xs); color: var(--color-text-muted);
  margin-top: var(--space-1); line-height: 1.5;
}

/* ── ACTION BUTTONS ──────────────────────────────────────── */
.action-grid {
  display: flex; gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-divider);
  flex-wrap: wrap;
}
.action-btn {
  flex: 1; min-width: 120px; min-height: 36px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-xs); font-weight: 600;
  background: var(--color-surface-2); color: var(--color-text);
  display: flex; align-items: center; justify-content: center; gap: var(--space-2);
}
.action-btn:hover {
  background: var(--color-primary-light); color: var(--color-primary);
  border-color: oklch(from var(--color-primary) l c h / 0.3);
}
.action-btn:active { transform: scale(0.98); }

/* ── BREAKDOWN BODY ──────────────────────────────────────── */
.breakdown-body {
  padding: var(--space-4) var(--space-5);
}
.breakdown-grid {
  display: flex; flex-direction: column; gap: var(--space-4);
}

/* Rules card */
.rules-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.rules-card-head {
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-divider);
}
.rules-card-head h4 {
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--color-text-muted);
}

/* Breakdown cards */
.breakdown-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.breakdown-card-head {
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-divider);
}
.breakdown-card-head h4 {
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--color-primary);
}

/* Shared table for both */
.breakdown-table { width: 100%; border-collapse: collapse; }
.breakdown-table tr:not(:last-child) td { border-bottom: 1px solid var(--color-divider); }
.breakdown-table tr:hover td { background: var(--color-surface-offset); }
.breakdown-table td {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs); vertical-align: middle;
}
.breakdown-table td:first-child { color: var(--color-text-muted); width: 62%; }
.breakdown-table td:last-child {
  color: var(--color-text); font-weight: 600;
  font-variant-numeric: tabular-nums lining-nums; text-align: right;
}
.breakdown-table tr.subtotal td {
  background: var(--color-primary-light);
  font-weight: 700; color: var(--color-primary);
}

/* ── HOUSEHOLD TABLE ─────────────────────────────────────── */
.household-table-wrap {
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.household-table { width: 100%; border-collapse: collapse; font-size: var(--text-xs); }
.household-table thead tr { border-bottom: 2px solid var(--color-divider); }
.household-table thead th {
  padding: var(--space-2) var(--space-4); text-align: left;
  font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--color-text-muted); white-space: nowrap;
}
.household-table thead th:not(:first-child) { text-align: right; }
.household-table thead th.col-total { color: var(--color-primary); }
.household-table tbody tr:not(:last-child) td { border-bottom: 1px solid var(--color-divider); }
.household-table tbody tr:hover td { background: var(--color-surface-offset); }
.household-table tbody td {
  padding: var(--space-3) var(--space-4); color: var(--color-text-muted);
  white-space: nowrap;
}
.household-table tbody td:first-child { color: var(--color-text); font-weight: 600; }
.household-table tbody td:not(:first-child) {
  text-align: right; font-weight: 600; color: var(--color-text);
  font-variant-numeric: tabular-nums lining-nums;
}
.household-table tbody tr.row-total td {
  background: var(--color-primary-light); font-weight: 700;
  color: var(--color-primary);
  border-top: 2px solid oklch(from var(--color-primary) l c h / 0.2);
}
.household-table tbody td.col-total { color: var(--color-primary) !important; }

/* ── WARNINGS ────────────────────────────────────────────── */
.warnings-list {
  padding: var(--space-4) var(--space-5);
  display: flex; flex-direction: column; gap: var(--space-3);
}
.warning-card {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-xs); line-height: 1.5;
  border: 1px solid transparent;
  display: flex; flex-direction: column; gap: 3px;
}
.warning-card strong { font-weight: 700; letter-spacing: 0.05em; }
.warning-card.success { background: var(--color-success-bg); color: var(--color-success); border-color: oklch(from var(--color-success) l c h / 0.25); }
.warning-card.warning { background: var(--color-warning-bg); color: var(--color-warning); border-color: oklch(from var(--color-warning) l c h / 0.25); }
.warning-card.error   { background: var(--color-error-bg);   color: var(--color-error);   border-color: oklch(from var(--color-error)   l c h / 0.25); }
.warning-card.info    { background: var(--color-info-bg);    color: var(--color-info);    border-color: oklch(from var(--color-info)    l c h / 0.25); }

/* ── PRINT ───────────────────────────────────────────────── */
@media print {
  .site-header { display: none; }
  .row-inputs  { grid-template-columns: 1fr; }
  .row-breakdown { grid-template-columns: 1fr; }
  .input-panel { display: none; }
  .panel { box-shadow: none; border: 1px solid #ccc; page-break-inside: avoid; }
  .action-grid { display: none; }
}