/* EnergyP2P design tokens. See web/DESIGN.md.
   Dark terminal ground, mono figures, one green accent (savings only).
   Dials: ENERGY 2 / RHYTHM 1 / MOTION 1 (hover transitions only). */

:root {
  --base: #0C1116;    /* page ground */
  --panel: #141B23;   /* one elevation step, solid, no glass */
  --ink: #E8EDF2;     /* primary text */
  --muted: #8B98A5;   /* secondary text */
  --accent: #00C853;  /* savings / positive / primary CTA fill only */
  --danger: #FF5252;  /* failures, destructive actions */
  --border: #22303C;

  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --r: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s6: 24px;
  --s8: 32px;
  --maxw: 1100px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--base);
  color: var(--ink);
  font: 400 13px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--s4); }
.mt { margin-top: var(--s4); }
.mb { margin-bottom: var(--s4); }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.grow { flex: 1; min-width: 0; }
hr.sep { border: none; border-top: 1px solid var(--border); margin: var(--s4) 0; }

a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

/* visible focus everywhere; outline:none appears nowhere in this file */
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

/* header */
header.site {
  position: sticky; top: 0; z-index: 10;
  background: var(--base);
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex; align-items: center; gap: var(--s4);
  min-height: 52px; flex-wrap: wrap;
  padding-top: var(--s2); padding-bottom: var(--s2);
}
.brand {
  font-family: var(--mono); font-weight: 700; font-size: 15px;
  letter-spacing: .02em; color: var(--ink); text-decoration: none;
}
.brand:hover { color: var(--ink); }
nav.main { margin-left: auto; display: flex; gap: var(--s2); flex-wrap: wrap; align-items: center; }
nav.main a {
  color: var(--muted); text-decoration: none;
  font-family: var(--mono); font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em;
  padding: 6px 10px;
}
nav.main a:hover, nav.main a.active { color: var(--ink); }

/* panels: one rhythm, repeated (RHYTHM 1) */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: var(--s4);
}
.panel h1, .panel h2 { margin: 0 0 var(--s2); font-weight: 600; }
.panel h1 { font-size: 20px; }
.panel h2 { font-size: 15px; }
.sub { color: var(--muted); margin: 0 0 var(--s3); }

.grid { display: grid; gap: var(--s4); }
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

.row { display: flex; gap: var(--s2); align-items: center; flex-wrap: wrap; }

/* buttons: rectangular 4px, mono uppercase 12px; one primary per view */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s2);
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--border); border-radius: var(--r);
  padding: 0 14px; min-height: 36px; cursor: pointer; text-decoration: none;
  font-family: var(--mono); font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em;
  transition: border-color .15s ease, background-color .15s ease, color .15s ease;
}
.btn:hover { border-color: var(--muted); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--base); }
.btn.primary:hover { filter: brightness(.92); border-color: var(--accent); }
.btn.danger { color: var(--danger); }
.btn.danger:hover { border-color: var(--danger); }
.btn.small { min-height: 30px; padding: 0 10px; }

/* labels above inputs; 11px uppercase tracking, labels only */
label {
  display: block; margin: var(--s3) 0 var(--s1);
  color: var(--muted); font-size: 11px;
  text-transform: uppercase; letter-spacing: .06em;
}
input, select {
  width: 100%; min-width: 0; background: var(--base); color: var(--ink);
  border: 1px solid var(--border); border-radius: var(--r);
  padding: 8px 10px;
  font: 400 15px/1.4 var(--mono);
}
input::placeholder { color: var(--muted); opacity: 1; }

/* figures */
.stat {
  background: var(--base); border: 1px solid var(--border);
  border-radius: var(--r); padding: var(--s3) var(--s4);
}
.stat .v { font-family: var(--mono); font-weight: 700; font-size: 20px; }
.stat .l { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .06em; margin-top: 2px; }
.stat.good .v { color: var(--accent); } /* positive delta only */
.big { font-family: var(--mono); font-weight: 700; font-size: 28px; line-height: 1.15; }

/* tables: numeric columns right-aligned via .num */
table.list { width: 100%; border-collapse: collapse; }
table.list th {
  text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border);
  font: 600 11px/1.4 var(--mono); text-transform: uppercase; letter-spacing: .06em;
  color: var(--muted);
}
table.list td {
  padding: 8px; border-bottom: 1px solid var(--border);
  font-family: var(--mono); font-size: 13px;
}
table.list td.txt { font-family: var(--sans); }
table.list th.num, table.list td.num { text-align: right; }
td.brk, .brk { word-break: break-all; }
.tscroll { overflow-x: auto; } /* keeps wide tables from overflowing the page */

/* status: colored dot + word, never a pill */
.st {
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  font-family: var(--mono); font-size: 12px; color: var(--muted);
}
.st::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: none; }
.st.ok { color: var(--ink); }
.st.ok::before { background: var(--accent); }
.st.err { color: var(--danger); }
.st.err::before { background: var(--danger); }

/* mandatory panel states (core R-27) */
.state-empty { color: var(--muted); }
.state-loading { color: var(--muted); animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }
.state-error { color: var(--danger); }
@media (prefers-reduced-motion: reduce) { .state-loading { animation: none; } }

.banner {
  border: 1px solid var(--border); background: var(--base);
  border-radius: var(--r); padding: 8px 10px;
  font-size: 13px; margin: var(--s2) 0;
}
.banner.err { border-color: var(--danger); color: var(--danger); }
.banner.ok::before {
  content: ""; display: inline-block; width: 8px; height: 8px;
  border-radius: 50%; background: var(--accent); margin-right: 8px;
}

.line {
  display: flex; align-items: center; gap: var(--s2); flex-wrap: wrap;
  padding: 8px 0; border-bottom: 1px solid var(--border);
}
.line:last-child { border-bottom: none; }

/* the payment card is the single elevated surface (one soft shadow) */
.paycard {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--r); padding: var(--s4); margin-top: var(--s3);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .45);
}
.paycard .lbl {
  display: block; color: var(--muted); font-size: 11px;
  text-transform: uppercase; letter-spacing: .06em; margin-top: var(--s3);
}

/* landing: calculator is the one focal block; how-it-works stays quiet */
.calc { margin-top: var(--s6); }
.how { margin-top: var(--s4); color: var(--muted); }
.how h2 { font-size: 13px; }
.how ol { margin: var(--s2) 0 0; padding-left: 18px; }
.how li { margin: 2px 0; }
.how b { color: var(--ink); font-weight: 600; }

footer.site {
  border-top: 1px solid var(--border);
  margin-top: var(--s8); padding: var(--s4) 0 var(--s6);
  color: var(--muted); font-size: 13px;
}
footer.site a { color: var(--muted); }

/* mobile: stack, 44px tap targets, no page-level horizontal overflow */
@media (max-width: 700px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .btn, input, select { min-height: 44px; }
  .btn.small { min-height: 44px; }
  nav.main a { min-height: 44px; display: inline-flex; align-items: center; }
  .panel { padding: var(--s3); }
  table.list td { padding: 6px; font-size: 12px; }
  .big { font-size: 24px; }
}