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

:root {
  --bg:        #080b08;
  --bg-card:   #0d120d;
  --bg-input:  #111811;
  --border:    #1a3a1a;
  --border-hi: #2a6a2a;
  --green:     #00e054;
  --green-dim: #00a03c;
  --green-lo:  #005c22;
  --text:      #c8f0c8;
  --text-dim:  #6a966a;
  --red:       #ff4d4d;
  --glow:      0 0 12px rgba(0, 224, 84, 0.25);
  --glow-hi:   0 0 20px rgba(0, 224, 84, 0.5);
  --radius:    6px;
  --font-mono: 'Courier New', 'Lucida Console', monospace;
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  padding: 2rem 1rem 4rem;
  line-height: 1.6;
}

/* ── Layout ─────────────────────────────── */

.container {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Header ──────────────────────────────── */

header {
  text-align: center;
  padding: 1rem 0 0.5rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: bold;
  color: var(--green);
  letter-spacing: 0.12em;
  text-shadow: var(--glow-hi);
}

.tagline {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 0.25rem;
  letter-spacing: 0.08em;
}

/* ── Explainer ───────────────────────────── */

.explainer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green-lo);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.explainer strong {
  color: var(--green-dim);
}

/* ── Card ────────────────────────────────── */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

/* ── Form ────────────────────────────────── */

.field-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

@media (max-width: 480px) {
  .field-group { grid-template-columns: 1fr; }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

label {
  font-size: 0.78rem;
  color: var(--green);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.helper {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: -0.15rem;
}

/* ── Inputs ──────────────────────────────── */

.input-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.input-wrap:focus-within {
  border-color: var(--green-dim);
  box-shadow: var(--glow);
}

.affix {
  padding: 0 0.6rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  white-space: nowrap;
  user-select: none;
}

.input-wrap.prefix .affix { border-right: 1px solid var(--border); }
.input-wrap.suffix .affix { border-left: 1px solid var(--border); }

input[type="number"],
select {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 0.6rem 0.75rem;
  width: 100%;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0.6rem 0.75rem;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

select:focus {
  border-color: var(--green-dim);
  box-shadow: var(--glow);
  outline: none;
}

select option { background: var(--bg-card); }

/* ── Error ───────────────────────────────── */

.form-error {
  font-size: 0.82rem;
  color: var(--red);
  border: 1px solid rgba(255, 77, 77, 0.3);
  background: rgba(255, 77, 77, 0.06);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.75rem;
}

.hidden { display: none !important; }

/* ── Button ──────────────────────────────── */

button[type="submit"] {
  width: 100%;
  padding: 0.85rem;
  background: transparent;
  border: 2px solid var(--green);
  border-radius: var(--radius);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: bold;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s, color 0.15s;
  text-shadow: var(--glow);
  margin-top: 0.25rem;
}

button[type="submit"]:hover {
  background: rgba(0, 224, 84, 0.1);
  box-shadow: var(--glow-hi);
}

button[type="submit"]:active {
  background: rgba(0, 224, 84, 0.2);
}

/* ── Results ─────────────────────────────── */

.results { margin-top: 0; }

.results-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.results-title {
  font-size: 0.78rem;
  color: var(--green);
  letter-spacing: 0.15em;
}

.edge-badge {
  font-size: 0.72rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  letter-spacing: 0.06em;
}

.edge-badge.positive {
  background: rgba(0, 224, 84, 0.12);
  border: 1px solid var(--green-lo);
  color: var(--green);
  text-shadow: var(--glow);
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 480px) {
  .results-grid { grid-template-columns: 1fr 1fr; }
}

.result-item {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}

.result-item.highlight {
  border-color: var(--green-lo);
  background: rgba(0, 224, 84, 0.05);
  box-shadow: var(--glow);
  grid-column: span 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-label {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}

.result-item.highlight .result-label { margin-bottom: 0; }

.result-value {
  font-size: 1.3rem;
  color: var(--green);
  font-weight: bold;
}

.result-item.highlight .result-value {
  font-size: 1.7rem;
  text-shadow: var(--glow-hi);
}

/* ── P&L Row ─────────────────────────────── */

.pnl-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
}

.pnl-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.pnl-divider {
  color: var(--border-hi);
  font-size: 1.2rem;
}

.pnl-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.pnl-value {
  font-size: 1rem;
  font-weight: bold;
}

.pnl-value.green { color: var(--green); }
.pnl-value.red   { color: var(--red); }

/* ── Homepage disclaimer ─────────────────── */

.disclaimer {
  font-size: 0.72rem;
  color: var(--text-dim);
  opacity: 0.6;
  margin-top: 0.35rem;
  letter-spacing: 0.04em;
}

/* ── Footer ──────────────────────────────── */

.site-footer {
  max-width: 680px;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  opacity: 0.55;
  text-align: center;
  line-height: 1.5;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a,
.back-link {
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.06em;
}

.footer-links a:hover,
.back-link:hover {
  color: var(--green-dim);
}

/* ── Legal pages ─────────────────────────── */

.legal-card { padding: 1.75rem 2rem; }

.legal-title {
  font-size: 1.1rem;
  color: var(--green);
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.legal-meta {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.legal-body {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.legal-body h2 {
  font-size: 0.78rem;
  color: var(--green-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.legal-body p {
  font-size: 0.83rem;
  color: var(--text-dim);
  line-height: 1.75;
}

/* ── Education divider ───────────────────── */

.edu-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  margin-top: 0.5rem;
}

.edu-divider::before,
.edu-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Education section ───────────────────── */

.edu-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-bottom: 2rem;
}

.edu-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.warning-block {
  border-color: rgba(255, 77, 77, 0.25);
  border-left: 3px solid rgba(255, 77, 77, 0.5);
}

.edu-heading {
  font-size: 0.8rem;
  color: var(--green);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: bold;
}

.edu-body {
  font-size: 0.83rem;
  color: var(--text-dim);
  line-height: 1.7;
}

.edu-body strong {
  color: var(--text);
}

.edu-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.83rem;
  color: var(--text-dim);
  padding-left: 0.5rem;
}

.edu-list li::before {
  content: '›  ';
  color: var(--green-dim);
}

/* ── Formula box ─────────────────────────── */

.formula-box {
  background: #060e06;
  border: 1px solid var(--border);
  border-left: 3px solid var(--green-lo);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.formula-box.compact {
  gap: 0.5rem;
  padding: 0.9rem 1.2rem;
}

.formula-line {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.formula-line.small {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.formula-var {
  color: var(--green-dim);
  font-style: italic;
}

.formula-var.highlight,
.formula-num.highlight {
  color: var(--green);
  text-shadow: var(--glow);
}

.formula-num {
  color: var(--text);
}

.formula-op {
  color: var(--text-dim);
  padding: 0 0.1rem;
}

.formula-comment {
  color: var(--text-dim);
  font-size: 0.78rem;
}

/* CSS fraction */
.frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  gap: 2px;
  line-height: 1.2;
}

.frac-num,
.frac-den {
  font-size: 0.85rem;
  padding: 0 0.3rem;
  color: var(--text);
}

.frac-bar {
  width: 100%;
  height: 1px;
  background: var(--green-dim);
  display: block;
}

.formula-legend {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-dim);
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}

/* ── Result callout ──────────────────────── */

.result-callout {
  background: rgba(0, 224, 84, 0.05);
  border: 1px solid var(--green-lo);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.callout-line {
  font-size: 0.9rem;
  color: var(--green);
}

.callout-line.dim {
  color: var(--text-dim);
  font-size: 0.82rem;
}

.callout-line strong {
  color: var(--text);
}

/* ── Tags ────────────────────────────────── */

.tag-pos {
  display: inline-block;
  background: rgba(0, 224, 84, 0.1);
  border: 1px solid var(--green-lo);
  color: var(--green);
  border-radius: 3px;
  padding: 0 0.4rem;
  font-size: 0.78rem;
  margin-right: 0.2rem;
}

.tag-neg {
  display: inline-block;
  background: rgba(255, 77, 77, 0.08);
  border: 1px solid rgba(255, 77, 77, 0.25);
  color: var(--red);
  border-radius: 3px;
  padding: 0 0.4rem;
  font-size: 0.78rem;
  margin-right: 0.2rem;
}