/*  PayInvoice Portal — Design System  (SPEC-S1-001 · Session 1)
 *  Foundation layer for the supplier portal: design tokens + core components.
 *  Loaded on every portal page via web_include_css (hooks.py).
 *
 *  Conventions
 *  -----------
 *  - Everything is namespaced `pi-` (classes) / `--pi-*` (tokens) so it composes
 *    with templates/web.html's Bootstrap without collisions. We never restyle a
 *    bare element selector that Bootstrap owns.
 *  - Tokens are the single source of truth; components reference tokens only —
 *    no off-token literals inside component rules (AC1).
 *  - Palette + type mirror the Founder-approved e-invoice capture design.
 */

/* ============================================================== *
 *  1. DESIGN TOKENS
 * ============================================================== */
:root {
  /* -- Brand & ink -- */
  --pi-ink:            #0F2E2C;
  --pi-brand:          #0C5C57;
  --pi-brand-deep:     #08433F;
  --pi-brand-soft:     #E3EFED;

  /* -- Semantic status -- */
  --pi-success:        #0E7C5A;   --pi-success-soft: #E5F4EE;
  --pi-warn:           #A66A0B;   --pi-warn-soft:    #FBF0DC;
  --pi-danger:         #B23A2C;   --pi-danger-soft:  #FBEAE7;
  --pi-info:           #1D5E87;   --pi-info-soft:    #E6F2FB;
  --pi-gold:           #9A6B12;   --pi-gold-soft:    #F6EEDD;

  /* -- Neutrals -- */
  --pi-bg:             #F4F6F4;
  --pi-card:           #FFFFFF;
  --pi-line:           #E2E8E4;
  --pi-line-strong:    #CBD6D1;
  --pi-muted:          #4F625E;
  --pi-muted-2:        #73847F;

  /* -- Typography -- */
  --pi-font-sans:      'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --pi-font-head:      'Sora', var(--pi-font-sans);
  --pi-font-mono:      'IBM Plex Mono', ui-monospace, Menlo, "Cascadia Code", monospace;
  --pi-fs-display:     clamp(22px, 3vw, 30px);
  --pi-fs-h2:          20px;
  --pi-fs-h3:          16px;
  --pi-fs-body:        14px;
  --pi-fs-sm:          12.5px;
  --pi-fs-xs:          11px;
  --pi-fw-reg:         400;
  --pi-fw-med:         500;
  --pi-fw-semi:        600;
  --pi-fw-bold:        700;

  /* -- Spacing scale (4px base) -- */
  --pi-s1: 4px;  --pi-s2: 8px;  --pi-s3: 12px; --pi-s4: 16px;
  --pi-s5: 20px; --pi-s6: 24px; --pi-s7: 32px; --pi-s8: 40px;

  /* -- Radius -- */
  --pi-r-sm: 8px;  --pi-r:    12px; --pi-r-lg: 16px; --pi-r-pill: 999px;

  /* -- Elevation -- */
  --pi-e1: 0 1px 2px rgba(15,46,44,.06);
  --pi-e2: 0 1px 2px rgba(15,46,44,.05), 0 10px 30px rgba(15,46,44,.08);

  /* -- Motion -- */
  --pi-motion: 160ms cubic-bezier(.2,.6,.2,1);

  /* -- Focus ring (a11y / WCAG 2.2 AA) -- */
  --pi-focus: 0 0 0 3px rgba(12,92,87,.35);
}

@media (prefers-reduced-motion: reduce) {
  :root { --pi-motion: 0ms; }
}

/* ============================================================== *
 *  2. PRIMITIVES
 * ============================================================== */
.pi-scope { font-family: var(--pi-font-sans); color: var(--pi-ink); font-size: var(--pi-fs-body); line-height: 1.55; }
.pi-h1 { font-family: var(--pi-font-head); font-weight: var(--pi-fw-bold); font-size: var(--pi-fs-display); letter-spacing: -.01em; line-height: 1.18; margin: 0; }
.pi-h2 { font-family: var(--pi-font-head); font-weight: var(--pi-fw-semi); font-size: var(--pi-fs-h2); letter-spacing: -.01em; margin: 0; }
.pi-h3 { font-family: var(--pi-font-head); font-weight: var(--pi-fw-semi); font-size: var(--pi-fs-h3); margin: 0; }
.pi-muted   { color: var(--pi-muted); }
.pi-muted-2 { color: var(--pi-muted-2); }
.pi-mono    { font-family: var(--pi-font-mono); }
.pi-tnum    { font-variant-numeric: tabular-nums; }
.pi-eyebrow { font-family: var(--pi-font-mono); font-size: var(--pi-fs-xs); letter-spacing: .14em; text-transform: uppercase; color: var(--pi-muted-2); }

/* Shared focus-visible treatment for interactive primitives */
.pi-btn:focus-visible, .pi-field input:focus-visible, .pi-field select:focus-visible,
.pi-field textarea:focus-visible, .pi-navrail a:focus-visible {
  outline: none; box-shadow: var(--pi-focus); border-color: var(--pi-brand);
}

/* ============================================================== *
 *  3. BUTTONS
 * ============================================================== */
.pi-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--pi-s2);
  font-family: var(--pi-font-sans); font-size: var(--pi-fs-body); font-weight: var(--pi-fw-semi);
  padding: 9px 16px; border-radius: var(--pi-r-sm); border: 1px solid transparent;
  cursor: pointer; text-decoration: none; transition: background var(--pi-motion), box-shadow var(--pi-motion), border-color var(--pi-motion);
  min-height: 40px; /* ≥44px touch target with line-height */
}
.pi-btn:disabled, .pi-btn.is-disabled { opacity: .5; cursor: not-allowed; }
.pi-btn--primary   { background: var(--pi-brand); color: #fff; }
.pi-btn--primary:hover:not(:disabled)   { background: var(--pi-brand-deep); }
.pi-btn--ghost     { background: #fff; border-color: var(--pi-line-strong); color: var(--pi-ink); }
.pi-btn--ghost:hover:not(:disabled)     { border-color: var(--pi-brand); color: var(--pi-brand); }
.pi-btn--danger    { background: var(--pi-danger); color: #fff; }
.pi-btn--sm        { padding: 6px 12px; min-height: 32px; font-size: var(--pi-fs-sm); }
.pi-btn--block     { width: 100%; }

/* ============================================================== *
 *  4. STATUS PILLS
 * ============================================================== */
.pi-pill {
  display: inline-flex; align-items: center; gap: var(--pi-s1);
  font-size: var(--pi-fs-xs); font-weight: var(--pi-fw-bold); line-height: 1;
  padding: 4px 9px; border-radius: var(--pi-r-pill); white-space: nowrap;
}
.pi-pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; opacity: .9; }
.pi-pill--success { background: var(--pi-success-soft); color: var(--pi-success); }
.pi-pill--warn    { background: var(--pi-warn-soft);    color: var(--pi-warn); }
.pi-pill--danger  { background: var(--pi-danger-soft);  color: var(--pi-danger); }
.pi-pill--info    { background: var(--pi-info-soft);    color: var(--pi-info); }
.pi-pill--neutral { background: #EEF2F0;                color: var(--pi-muted); }

/* ============================================================== *
 *  5. CARDS
 * ============================================================== */
.pi-card { background: var(--pi-card); border: 1px solid var(--pi-line); border-radius: var(--pi-r); box-shadow: var(--pi-e1); }
.pi-card__head { padding: var(--pi-s4) var(--pi-s5); border-bottom: 1px solid var(--pi-line); display: flex; align-items: center; gap: var(--pi-s3); }
.pi-card__head .pi-h3 { margin: 0; }
.pi-card__body { padding: var(--pi-s5); }
.pi-card__foot { padding: var(--pi-s3) var(--pi-s5); border-top: 1px solid var(--pi-line); background: #FBFCFB; border-radius: 0 0 var(--pi-r) var(--pi-r); }

/* ============================================================== *
 *  6. CASH POSITION (hero metric)
 * ============================================================== */
.pi-cash {
  background: radial-gradient(120% 140% at 90% -30%, rgba(14,124,90,.16), transparent 46%),
              linear-gradient(180deg, #0E2A2B, #0B3B38);
  color: #EAF2EF; border-radius: var(--pi-r-lg); padding: var(--pi-s6); box-shadow: var(--pi-e2);
}
.pi-cash__label { font-family: var(--pi-font-mono); font-size: var(--pi-fs-xs); letter-spacing: .12em; text-transform: uppercase; color: #8FD9C2; }
.pi-cash__value { font-family: var(--pi-font-head); font-weight: var(--pi-fw-bold); font-size: clamp(26px, 5vw, 40px); line-height: 1.1; margin-top: var(--pi-s2); }
.pi-cash__sub   { color: #C7DAD4; font-size: var(--pi-fs-sm); margin-top: var(--pi-s2); }
.pi-cash__row   { display: flex; flex-wrap: wrap; gap: var(--pi-s6); margin-top: var(--pi-s5); }
.pi-cash__stat .k { font-size: var(--pi-fs-xs); color: #9CC4BC; text-transform: uppercase; letter-spacing: .06em; }
.pi-cash__stat .v { font-family: var(--pi-font-head); font-weight: var(--pi-fw-semi); font-size: var(--pi-fs-h2); margin-top: 2px; }

/* ============================================================== *
 *  7. DATA TABLE
 * ============================================================== */
.pi-table-wrap { overflow-x: auto; border: 1px solid var(--pi-line); border-radius: var(--pi-r); background: #fff; }
.pi-table { border-collapse: collapse; width: 100%; font-size: var(--pi-fs-sm); }
.pi-table thead th { background: #F1F5F3; text-align: left; padding: 10px 13px; font-size: var(--pi-fs-xs); letter-spacing: .05em; text-transform: uppercase; color: var(--pi-muted); font-weight: var(--pi-fw-bold); border-bottom: 1px solid var(--pi-line); }
.pi-table tbody td { padding: 10px 13px; border-bottom: 1px solid var(--pi-line); vertical-align: middle; }
.pi-table tbody tr:last-child td { border-bottom: 0; }
.pi-table tbody tr.pi-row--link { cursor: pointer; transition: background var(--pi-motion); }
.pi-table tbody tr.pi-row--link:hover { background: var(--pi-brand-soft); }
.pi-table .pi-num { text-align: right; font-variant-numeric: tabular-nums; }

/* ============================================================== *
 *  8. FORM FIELDS
 * ============================================================== */
.pi-field { margin-bottom: var(--pi-s3); }
.pi-field > label { display: flex; align-items: center; gap: var(--pi-s2); font-size: var(--pi-fs-sm); font-weight: var(--pi-fw-semi); color: var(--pi-muted); margin-bottom: var(--pi-s1); }
.pi-field input, .pi-field select, .pi-field textarea {
  width: 100%; font-family: var(--pi-font-sans); font-size: var(--pi-fs-body); color: var(--pi-ink);
  background: #F7F9F8; border: 1px solid var(--pi-line); border-radius: var(--pi-r-sm);
  padding: 9px 12px; transition: border-color var(--pi-motion), box-shadow var(--pi-motion);
}
.pi-field input::placeholder, .pi-field textarea::placeholder { color: var(--pi-muted-2); }
.pi-field--required > label::after { content: "*"; color: var(--pi-danger); margin-left: 2px; }
.pi-field__hint  { font-size: var(--pi-fs-xs); color: var(--pi-muted-2); margin-top: var(--pi-s1); }
.pi-field__error { font-size: var(--pi-fs-xs); color: var(--pi-danger); margin-top: var(--pi-s1); }
.pi-field.is-invalid input, .pi-field.is-invalid select, .pi-field.is-invalid textarea { border-color: var(--pi-danger); background: var(--pi-danger-soft); }
.pi-tag-fromqr { font-size: 9px; font-weight: var(--pi-fw-bold); color: #7A540C; background: var(--pi-gold-soft); padding: 1px 6px; border-radius: var(--pi-r-pill); }

/* ============================================================== *
 *  9. STATE BLOCKS  (empty / loading / error)
 * ============================================================== */
.pi-state { text-align: center; padding: var(--pi-s8) var(--pi-s5); color: var(--pi-muted); }
.pi-state__icon { font-size: 30px; opacity: .5; margin-bottom: var(--pi-s3); }
.pi-state__title { font-family: var(--pi-font-head); font-weight: var(--pi-fw-semi); font-size: var(--pi-fs-h3); color: var(--pi-ink); }
.pi-state__sub { font-size: var(--pi-fs-sm); margin-top: var(--pi-s1); }
.pi-skel { background: linear-gradient(90deg, #EEF2F0 25%, #E2E8E4 37%, #EEF2F0 63%); background-size: 400% 100%; animation: pi-shimmer 1.4s ease infinite; border-radius: var(--pi-r-sm); }
.pi-skel--line { height: 12px; margin: var(--pi-s2) 0; }
.pi-skel--block { height: 72px; }
@keyframes pi-shimmer { 0% { background-position: 100% 0; } 100% { background-position: 0 0; } }
@media (prefers-reduced-motion: reduce) { .pi-skel { animation: none; } }

/* ============================================================== *
 *  10. NAV RAIL
 * ============================================================== */
.pi-navrail { display: flex; flex-direction: column; gap: 2px; }
.pi-navrail a { display: flex; align-items: center; gap: var(--pi-s3); padding: 10px 14px; border-radius: var(--pi-r-sm); color: var(--pi-muted); font-size: var(--pi-fs-body); font-weight: var(--pi-fw-med); text-decoration: none; min-height: 44px; transition: background var(--pi-motion), color var(--pi-motion); }
.pi-navrail a:hover { background: var(--pi-brand-soft); color: var(--pi-brand-deep); }
.pi-navrail a.is-active { background: var(--pi-brand); color: #fff; }
.pi-navrail a .pi-ico { width: 18px; text-align: center; flex: none; }

/* ============================================================== *
 *  11. NOTIFICATION BADGE
 * ============================================================== */
.pi-badge { display: inline-grid; place-items: center; min-width: 18px; height: 18px; padding: 0 5px; border-radius: var(--pi-r-pill); background: var(--pi-danger); color: #fff; font-size: 10px; font-weight: var(--pi-fw-bold); line-height: 1; }
.pi-badge--soft { background: var(--pi-brand-soft); color: var(--pi-brand-deep); }
.pi-has-badge { position: relative; }
.pi-has-badge > .pi-badge { position: absolute; top: -6px; right: -8px; }

/* ============================================================== *
 *  12. LAYOUT HELPERS
 * ============================================================== */
.pi-grid { display: grid; gap: var(--pi-s4); }
.pi-grid--2 { grid-template-columns: repeat(2, 1fr); }
.pi-grid--3 { grid-template-columns: repeat(3, 1fr); }
.pi-grid--4 { grid-template-columns: repeat(4, 1fr); }
.pi-stack > * + * { margin-top: var(--pi-s4); }
.pi-row { display: flex; align-items: center; gap: var(--pi-s3); }
.pi-row--between { justify-content: space-between; }
@media (max-width: 760px) {
  .pi-grid--2, .pi-grid--3, .pi-grid--4 { grid-template-columns: 1fr; }
}