/* ═══════════════════════════════════════════════════════════
   Payment Gateway Simulator — 2D Flat Design System
   No gradients on surfaces, sharp borders, crisp typography
   ═══════════════════════════════════════════════════════════ */

:root {
  --sim-bg: #1a1a20;
  --sim-surface: #24242c;
  --sim-surface-2: #2c2c36;
  --sim-border: #3a3a46;
  --sim-border-focus: #d4af37;
  --sim-text: #ececf2;
  --sim-muted: #8f8fa0;
  --sim-accent: #d4af37;
  --sim-success: #34d399;
  --sim-warning: #fbbf24;
  --sim-danger: #f87171;
  --sim-pending: #a78bfa;
  --sim-radius: 8px;
  --sim-font: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --sim-mono: 'JetBrains Mono', 'Consolas', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body.sim-body {
  font-family: var(--sim-font);
  background: var(--sim-bg);
  color: var(--sim-text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout shell ─────────────────────────────────────── */
.sim-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem;
}

.sim-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--sim-border);
  margin-bottom: 1.5rem;
}

.sim-logo {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sim-accent);
}

.sim-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.sim-nav a {
  color: var(--sim-muted);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--sim-radius);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.sim-nav a:hover,
.sim-nav a.is-active {
  color: var(--sim-text);
  border-color: var(--sim-border);
  background: var(--sim-surface);
}

/* ── Grid layouts ─────────────────────────────────────── */
.sim-grid-checkout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 900px) {
  .sim-grid-checkout {
    grid-template-columns: 1fr 380px;
    align-items: start;
  }
}

.sim-grid-dash {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .sim-grid-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }
}

/* ── Panels (flat cards) ────────────────────────────── */
.sim-panel {
  background: var(--sim-surface);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  padding: 1.25rem;
}

.sim-panel-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sim-muted);
  margin-bottom: 1rem;
}

/* ── Tabs ───────────────────────────────────────────── */
.sim-tabs {
  display: flex;
  border-bottom: 1px solid var(--sim-border);
  margin-bottom: 1.25rem;
}

.sim-tab {
  flex: 1;
  padding: 0.65rem 1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--sim-muted);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.sim-tab:hover { color: var(--sim-text); }

.sim-tab.is-active {
  color: var(--sim-accent);
  border-bottom-color: var(--sim-accent);
}

.sim-tab-panel { display: none; }
.sim-tab-panel.is-active { display: block; }

/* ── Flat card strip preview ────────────────────────── */
.sim-card-strip {
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  background: var(--sim-surface-2);
  padding: 1rem;
  margin-bottom: 1.25rem;
}

.sim-card-strip-inner {
  border-left: 3px solid var(--sim-accent);
  padding-left: 0.85rem;
}

.sim-strip-brand {
  height: 20px;
  margin-bottom: 0.75rem;
}

.sim-strip-brand svg { height: 100%; opacity: 0; }
.sim-strip-brand[data-brand='visa'] .sim-logo-visa,
.sim-field--pan[data-brand='visa'] .sim-logo-visa { opacity: 1; }
.sim-strip-brand[data-brand='mastercard'] .sim-logo-mc,
.sim-field--pan[data-brand='mastercard'] .sim-logo-mc { opacity: 1; }
.sim-strip-brand[data-brand='amex'] .sim-logo-amex,
.sim-field--pan[data-brand='amex'] .sim-logo-amex { opacity: 1; }

.sim-strip-pan {
  font-family: var(--sim-mono);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  margin-bottom: 0.65rem;
  direction: ltr;
  text-align: left;
}

.sim-strip-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sim-muted);
}

.sim-strip-name { max-width: 60%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ── Form fields ────────────────────────────────────── */
.sim-fields { display: flex; flex-direction: column; gap: 0.85rem; }

.sim-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  position: relative;
}

.sim-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--sim-muted);
}

.sim-field input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  background: var(--sim-bg);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  color: var(--sim-text);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.sim-field input:focus {
  border-color: var(--sim-border-focus);
  box-shadow: 0 0 0 2px rgba(91, 141, 239, 0.2);
}

.sim-field.is-invalid input,
.sim-field--pan.is-invalid input { border-color: var(--sim-danger); }

.sim-field.is-valid input { border-color: var(--sim-success); }

.sim-field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.sim-field--pan input {
  padding-left: 3.5rem;
  font-family: var(--sim-mono);
  letter-spacing: 0.08em;
  direction: ltr;
  text-align: left;
}

.sim-field-brand {
  position: absolute;
  left: 0.65rem;
  bottom: 0.55rem;
  height: 18px;
  display: flex;
  pointer-events: none;
}

.sim-field-brand svg { height: 100%; opacity: 0; }

.sim-hint {
  min-height: 1rem;
  font-size: 0.68rem;
  color: var(--sim-muted);
}

.sim-cvv-row { display: flex; gap: 0.35rem; align-items: center; }
.sim-cvv-row input { flex: 1; }
.sim-cvv-tip {
  width: 28px;
  height: 28px;
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  background: var(--sim-surface-2);
  color: var(--sim-muted);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: help;
}

/* ── Crypto form ────────────────────────────────────── */
.sim-crypto-field textarea {
  width: 100%;
  min-height: 72px;
  padding: 0.65rem 0.75rem;
  background: var(--sim-bg);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  color: var(--sim-text);
  font-family: var(--sim-mono);
  font-size: 0.8rem;
  resize: vertical;
  outline: none;
}

.sim-crypto-field textarea:focus {
  border-color: var(--sim-border-focus);
}

/* ── Buttons ────────────────────────────────────────── */
.sim-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--sim-accent);
  border-radius: var(--sim-radius);
  background: var(--sim-accent);
  color: #fff;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.sim-btn:hover { opacity: 0.92; }
.sim-btn:active { transform: scale(0.99); }
.sim-btn:disabled { opacity: 0.45; cursor: not-allowed; }

.sim-btn--ghost {
  background: transparent;
  color: var(--sim-text);
  border-color: var(--sim-border);
}

.sim-btn--danger {
  background: transparent;
  border-color: var(--sim-danger);
  color: var(--sim-danger);
}

.sim-btn-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.sim-btn-row .sim-btn { width: auto; flex: 1; min-width: 120px; }

/* ── Amount input ───────────────────────────────────── */
.sim-amount-row {
  display: flex;
  align-items: stretch;
  margin-bottom: 1rem;
}

.sim-amount-row input {
  flex: 1;
  padding: 0.75rem;
  background: var(--sim-bg);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius) 0 0 var(--sim-radius);
  color: var(--sim-text);
  font-family: var(--sim-mono);
  font-size: 1.1rem;
  outline: none;
}

.sim-amount-row input:focus { border-color: var(--sim-border-focus); }

.sim-amount-currency {
  padding: 0 1rem;
  display: flex;
  align-items: center;
  background: var(--sim-surface-2);
  border: 1px solid var(--sim-border);
  border-left: none;
  border-radius: 0 var(--sim-radius) var(--sim-radius) 0;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--sim-muted);
}

/* ── Result toast ───────────────────────────────────── */
.sim-result {
  margin-top: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  font-size: 0.8rem;
  display: none;
}

.sim-result.is-visible { display: block; }
.sim-result.is-success { border-color: var(--sim-success); color: var(--sim-success); }
.sim-result.is-error { border-color: var(--sim-danger); color: var(--sim-danger); }
.sim-result.is-pending { border-color: var(--sim-pending); color: var(--sim-pending); }

/* ── Metrics cards ──────────────────────────────────── */
.sim-metric {
  background: var(--sim-surface);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  padding: 1rem 1.15rem;
}

.sim-metric-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sim-muted);
  margin-bottom: 0.35rem;
}

.sim-metric-value {
  font-family: var(--sim-mono);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.1;
}

.sim-metric-sub {
  font-size: 0.7rem;
  color: var(--sim-muted);
  margin-top: 0.25rem;
}

/* ── Data table ─────────────────────────────────────── */
.sim-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
}

.sim-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}

.sim-table th {
  text-align: left;
  padding: 0.65rem 0.85rem;
  background: var(--sim-surface-2);
  color: var(--sim-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--sim-border);
  white-space: nowrap;
}

.sim-table td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--sim-border);
  font-family: var(--sim-mono);
  font-size: 0.72rem;
}

.sim-table tbody tr {
  cursor: pointer;
  transition: background 0.12s;
}

.sim-table tbody tr:hover { background: var(--sim-surface-2); }
.sim-table tbody tr:last-child td { border-bottom: none; }

/* ── Status badges ──────────────────────────────────── */
.sim-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: 1px solid;
}

.sim-badge--success {
  color: var(--sim-success);
  border-color: var(--sim-success);
  background: rgba(34, 197, 94, 0.08);
}

.sim-badge--failed {
  color: var(--sim-danger);
  border-color: var(--sim-danger);
  background: rgba(239, 68, 68, 0.08);
}

.sim-badge--pending {
  color: var(--sim-pending);
  border-color: var(--sim-pending);
  background: rgba(99, 102, 241, 0.08);
}

/* ── Modal ──────────────────────────────────────────── */
.sim-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
}

.sim-modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.sim-modal {
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--sim-surface);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
}

.sim-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--sim-border);
}

.sim-modal-title {
  font-size: 0.85rem;
  font-weight: 700;
}

.sim-modal-close {
  background: none;
  border: 1px solid var(--sim-border);
  border-radius: 4px;
  color: var(--sim-muted);
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 1rem;
}

.sim-modal-body { padding: 1rem 1.15rem; }

.sim-kv {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0.35rem 0.75rem;
  font-size: 0.75rem;
  margin-bottom: 1rem;
}

.sim-kv dt {
  color: var(--sim-muted);
  font-weight: 600;
}

.sim-kv dd {
  font-family: var(--sim-mono);
  word-break: break-all;
}

.sim-json {
  background: var(--sim-bg);
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  padding: 0.75rem;
  font-family: var(--sim-mono);
  font-size: 0.68rem;
  overflow-x: auto;
  white-space: pre-wrap;
  max-height: 200px;
  overflow-y: auto;
}

.sim-live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sim-success);
  display: inline-block;
  margin-left: 0.35rem;
  animation: sim-pulse 1.5s ease infinite;
}

@keyframes sim-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.sim-toolbar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.sim-toolbar .sim-btn { width: auto; padding: 0.45rem 0.85rem; font-size: 0.72rem; }

.sim-empty {
  text-align: center;
  padding: 2rem;
  color: var(--sim-muted);
  font-size: 0.85rem;
}

.sim-rules {
  font-size: 0.72rem;
  color: var(--sim-muted);
  line-height: 1.6;
}

/* ── 4-Stage Wizard ───────────────────────────────────── */
.sim-wizard-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.sim-wizard-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--sim-muted);
  background: var(--sim-surface);
}

.sim-wizard-step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 1px solid var(--sim-border);
  font-size: 0.65rem;
}

.sim-wizard-step.is-active {
  color: var(--sim-text);
  border-color: var(--sim-accent);
}

.sim-wizard-step.is-active span {
  background: var(--sim-accent);
  border-color: var(--sim-accent);
  color: #fff;
}

.sim-wizard-step.is-done {
  color: var(--sim-success);
  border-color: rgba(34, 197, 94, 0.35);
}

.sim-stage-desc {
  font-size: 0.78rem;
  color: var(--sim-muted);
  margin-bottom: 1rem;
}

.sim-kraken-panel {
  margin: 1rem 0;
  padding: 0.85rem;
  border: 1px solid var(--sim-border);
  border-radius: var(--sim-radius);
  background: var(--sim-surface-2);
}

.sim-kv--inline {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1rem;
  font-size: 0.78rem;
}

.sim-wallet-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1rem 0;
}

.sim-field--check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  margin: 1rem 0;
}

.sim-field--check input { width: auto; }

.sim-rules code {
  font-family: var(--sim-mono);
  color: var(--sim-accent);
  background: var(--sim-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--sim-border);
}