/* ─── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font: 'IBM Plex Mono', 'Courier New', monospace;

  --bg:         #0d0f12;
  --bg-card:    #13161b;
  --bg-input:   #1a1e25;
  --bg-hover:   #1f242d;
  --border:     #252b35;
  --border-hi:  #343d4d;

  --text:       #e8eaf0;
  --text-muted: #6b7585;
  --text-dim:   #3d4555;

  --long:       #22c55e;
  --long-dim:   #14532d;
  --long-bg:    #0d1f14;

  --short:      #f97316;
  --short-dim:  #7c2d12;
  --short-bg:   #1f1208;

  --profit:     #22c55e;
  --loss:       #ef4444;
  --neutral:    #60a5fa;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ─── Google Font import ───────────────────────────────────────────────────── */
/* Font is loaded via <link> in HTML to comply with CSP style-src 'self' */

/* ─── App shell ────────────────────────────────────────────────────────────── */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header ───────────────────────────────────────────────────────────────── */
.header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-icon {
  font-size: 20px;
  color: var(--neutral);
}

.logo-text {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text);
  text-transform: uppercase;
}


/* ─── Main ─────────────────────────────────────────────────────────────────── */
.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  width: 100%;
}

/* ─── Tabs ─────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
}

.tab .tab-arrow {
  font-size: 10px;
}

.tab--long.active {
  background: var(--long-bg);
  border-color: var(--long);
  color: var(--long);
}

.tab--short.active {
  background: var(--short-bg);
  border-color: var(--short);
  color: var(--short);
}

.tab--long:hover:not(.active) {
  border-color: var(--long-dim);
  color: var(--long);
}

.tab--short:hover:not(.active) {
  border-color: var(--short-dim);
  color: var(--short);
}

/* ─── Panel ────────────────────────────────────────────────────────────────── */
.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hidden {
  display: none !important;
}

/* ─── Card ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px 24px;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text);
}

.card-badge {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 2px;
  text-transform: uppercase;
}

.card-badge--long {
  background: var(--long-bg);
  color: var(--long);
  border: 1px solid var(--long-dim);
}

.card-badge--short {
  background: var(--short-bg);
  color: var(--short);
  border: 1px solid var(--short-dim);
}

/* ─── Fields ───────────────────────────────────────────────────────────────── */
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.field-grid--3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.field-grid--halves {
  grid-template-columns: 1fr 1fr;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.field label {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.field .hint {
  color: var(--text-dim);
  font-size: 10px;
}

.field input {
  height: 36px;
  padding: 0 10px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  transition: border-color 0.15s;
}

.field input:focus {
  outline: none;
  border-color: var(--border-hi);
}

.field input::placeholder {
  color: var(--text-dim);
}

/* ─── Help modal ───────────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  border-radius: var(--radius-lg);
  padding: 28px 28px 24px;
  max-width: 480px;
  width: 100%;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}

.modal-close:hover {
  color: var(--text);
}

.modal-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 12px;
  padding-right: 24px;
}

.modal-body {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ─── Read-only display field ──────────────────────────────────────────────── */
.readonly-field {
  height: 36px;
  padding: 0 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 13px;
  display: flex;
  align-items: center;
  cursor: default;
  user-select: none;
}

/* ─── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  height: 36px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid;
  transition: all 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

.btn--long {
  background: var(--long-bg);
  border-color: var(--long);
  color: var(--long);
}

.btn--long:hover {
  background: var(--long);
  color: #000;
}

.btn--short {
  background: var(--short-bg);
  border-color: var(--short);
  color: var(--short);
}

.btn--short:hover {
  background: var(--short);
  color: #000;
}

/* ─── Help button ──────────────────────────────────────────────────────────── */
.help-btn {
  margin-left: auto;
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border-hi);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, filter 0.15s;
  flex-shrink: 0;
}

.help-btn:hover {
  border-color: var(--neutral);
  color: var(--neutral);
  filter: brightness(1.3);
}

/* ─── Results ──────────────────────────────────────────────────────────────── */
.results {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: none;
}

.results.visible {
  display: block;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.metric {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.metric-label {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.metric-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.metric-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}

.metric--profit .metric-value {
  color: var(--profit);
}

.metric--loss .metric-value {
  color: var(--loss);
}

.metric--neutral .metric-value {
  color: var(--neutral);
}

/* ─── Status badge ─────────────────────────────────────────────────────────── */
.status-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 2px;
  margin-top: 5px;
}

.status-badge--up {
  background: rgba(34, 197, 94, 0.12);
  color: var(--profit);
  border: 1px solid rgba(34, 197, 94, 0.25);
}

.status-badge--down {
  background: rgba(239, 68, 68, 0.12);
  color: var(--loss);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

/* ─── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .tabs {
    margin-left: 0;
  }

  .field-grid,
  .field-grid--3 {
    grid-template-columns: 1fr;
  }

  .main {
    padding: 20px 16px 48px;
  }
}

/* ─── Simulator slider ─────────────────────────────────────────────────────── */
.slider-wrap {
  margin-top: 16px;
}

.slider-axis {
  position: relative;
  height: 18px;
  margin-bottom: 4px;
}

.sim-axis-label {
  position: absolute;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.sim-axis-label--left  { left: 0; }
.sim-axis-label--right { right: 0; }

.slider-track-outer {
  position: relative;
  height: 6px;
  background: var(--bg-input);
  border-radius: 3px;
  overflow: visible;
  margin-bottom: 2px;
}

.slider-fill {
  position: absolute;
  top: 0;
  height: 100%;
  width: 0;
  pointer-events: none;
}

.slider-fill--loss   { left: 0;   background: var(--loss);   border-radius: 3px 0 0 3px; }
.slider-fill--profit { right: 0;  background: var(--profit); border-radius: 0 3px 3px 0; }

/* Entry-price tick — neutral/muted white */
.slider-entry-tick {
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--text-muted);
  pointer-events: none;
  transform: translateX(-50%);
}

/* Liquidation-price tick — red, visually distinct from entry tick (Req 6.4) */
.slider-liq-tick {
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--loss);
  display: none;
  pointer-events: none;
  transform: translateX(-50%);
}

/* Range input — sits on top of the track */
.sim-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: transparent;
  cursor: pointer;
  margin: 0;
  display: block;
  position: relative;
  z-index: 1;
}

.sim-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  border: 2px solid var(--bg-card);
  cursor: grab;
  margin-top: -4px;
}

.sim-range::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  border: 2px solid var(--bg-card);
  cursor: grab;
}

.sim-range--long::-webkit-slider-thumb  { background: var(--long); }
.sim-range--long::-moz-range-thumb      { background: var(--long); }
.sim-range--short::-webkit-slider-thumb { background: var(--short); }
.sim-range--short::-moz-range-thumb     { background: var(--short); }

/* Readout area below the slider */
.sim-readout {
  margin-top: 14px;
}

.sim-price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.sim-price-label {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.sim-price-val {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

/* ─── Auth gate ─────────────────────────────────────────────────────────── */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 32px 28px;
  width: 100%;
  max-width: 360px;
}

.auth-logo {
  display: flex;
  align-items: center;
  margin-bottom: 28px;
}

.auth-error {
  display: none;
  color: var(--loss);
  font-size: 12px;
  margin-top: 10px;
}

.auth-error--visible {
  display: block;
}

.btn--auth {
  width: 100%;
  height: 36px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid var(--neutral);
  background: transparent;
  color: var(--neutral);
  margin-top: 16px;
  transition: all 0.15s;
}

.btn--auth:hover {
  background: var(--neutral);
  color: #000;
}

.btn--auth:active {
  transform: scale(0.98);
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrap input {
  width: 100%;
  padding-right: 36px;
}

.pw-toggle {
  position: absolute;
  right: 0;
  height: 36px;
  width: 36px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s;
}

.pw-toggle:hover {
  color: var(--text);
}

.sim-actual-field {
  margin-bottom: 16px;
}

.sim-metric-row {
  margin-top: 10px;
}