/* ── Variables ───────────────────────────────────────────────────────────── */
:root {
  --bg:        #080b14;
  --bg-alt:    #0d1117;
  --bg-card:   #111827;
  --border:    #1f2937;
  --border-hi: #374151;
  --text:      #f3f4f6;
  --text-dim:  #9ca3af;
  --text-muted:#6b7280;
  --accent:    #6366f1;
  --accent-hi: #818cf8;
  --green:     #10b981;
  --amber:     #f59e0b;
  --red:       #ef4444;
  --blue:      #38bdf8;
  --purple:    #a78bfa;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
}
strong { color: var(--text); }
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82em;
  background: rgba(99,102,241,0.12);
  color: var(--accent-hi);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ── Navbar ──────────────────────────────────────────────────────────────── */
.navbar {
  background: rgba(8,11,20,0.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  padding: 12px 0;
  z-index: 100;
}
.navbar-brand {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent-hi) !important;
  letter-spacing: -0.3px;
}
.nav-link {
  color: var(--text-dim) !important;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color .2s;
}
.nav-link:hover { color: var(--text) !important; }

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 70px;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(99,102,241,0.15) 0%, transparent 70%),
              var(--bg);
  border-bottom: 1px solid var(--border);
}
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.tech-badge {
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.3);
  color: var(--accent-hi);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}
.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin: 20px 0 16px;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 auto;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  transition: border-color .2s;
}
.stat-card:hover { border-color: var(--border-hi); }
.stat-val { font-size: 1.6rem; font-weight: 800; color: var(--accent-hi); line-height: 1.1; }
.stat-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.05em; }

/* ── Sections ────────────────────────────────────────────────────────────── */
.section-main { padding: 72px 0; background: var(--bg); }
.section-alt  { padding: 72px 0; background: var(--bg-alt); }
.section-header { margin-bottom: 12px; }
.section-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: block;
  margin-bottom: 8px;
}
.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
  margin: 0;
}
.section-desc {
  color: var(--text-dim);
  max-width: 720px;
  margin-top: 10px;
}

/* ── Problem Cards ───────────────────────────────────────────────────────── */
.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  height: 100%;
}
.problem-icon { font-size: 1.8rem; margin-bottom: 12px; }
.problem-card h5 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.problem-card p  { color: var(--text-dim); font-size: 0.9rem; margin: 0; }
.callout {
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.2);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 14px 18px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ── Dataset ─────────────────────────────────────────────────────────────── */
.data-stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.ds-val   { font-size: 1.5rem; font-weight: 800; color: var(--green); }
.ds-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.05em; }
.feat-group-list { display: flex; flex-direction: column; gap: 10px; margin-top: 4px; }
.feat-group { font-size: 0.85rem; color: var(--text-dim); display: flex; align-items: center; gap: 10px; }
.fg-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* ── Chart Card ──────────────────────────────────────────────────────────── */
.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}
.chart-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

/* ── Approach ────────────────────────────────────────────────────────────── */
.approach-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  height: 100%;
  position: relative;
}
.approach-num {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.approach-card h5 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.approach-card p  { color: var(--text-dim); font-size: 0.88rem; margin-bottom: 12px; }
.arch-detail {
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-hi);
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 6px;
  padding: 8px 12px;
}
.graph-schema {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  margin-top: 10px;
}
.gs-node {
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.75rem;
}
.gs-node.txn   { background: rgba(99,102,241,0.2);  color: var(--accent-hi); }
.gs-node.card  { background: rgba(16,185,129,0.15); color: var(--green); }
.gs-node.addr  { background: rgba(245,158,11,0.15); color: var(--amber); }
.gs-node.email { background: rgba(239,68,68,0.15);  color: var(--red); }
.gs-node.dev   { background: rgba(56,189,248,0.15); color: var(--blue); }
.gs-arrow, .gs-sep { color: var(--text-muted); }

/* ── Decisions ───────────────────────────────────────────────────────────── */
.decision-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  height: 100%;
}
.dec-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.dec-detail { font-size: 0.85rem; color: var(--text-dim); margin: 0; }

/* ── Results ─────────────────────────────────────────────────────────────── */
.result-pill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.result-pill.highlight { border-color: rgba(99,102,241,0.4); background: rgba(99,102,241,0.07); }
.rp-label { font-size: 0.78rem; color: var(--text-dim); }
.rp-val   { font-size: 1.15rem; font-weight: 800; color: var(--accent-hi); }
.result-pill.highlight .rp-val { color: #a5b4fc; }

/* ── Fraud Ring ──────────────────────────────────────────────────────────── */
#fraud-ring-graph { width: 100%; min-height: 460px; }
#ring-summary-table table { width: 100%; border-collapse: collapse; font-size: 0.83rem; }
#ring-summary-table th { color: var(--text-muted); font-weight: 600; padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; }
#ring-summary-table td { padding: 10px 8px; border-bottom: 1px solid var(--border); color: var(--text); }
#ring-summary-table tr:last-child td { border-bottom: none; }
.badge-ring { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; }

/* ── Prediction Form ─────────────────────────────────────────────────────── */
.form-control, .form-select {
  background: #0d1117;
  border: 1px solid var(--border-hi);
  color: var(--text);
  border-radius: 8px;
  font-size: 0.9rem;
}
.form-control:focus, .form-select:focus {
  background: #0d1117;
  border-color: var(--accent);
  color: var(--text);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.2);
}
.form-label { font-size: 0.82rem; color: var(--text-dim); margin-bottom: 5px; font-weight: 500; }
.form-select option { background: var(--bg-card); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 10px;
  letter-spacing: 0.02em;
  transition: all .2s;
}
.btn-primary:hover { background: var(--accent-hi); border-color: var(--accent-hi); transform: translateY(-1px); }

.risk-badge {
  display: inline-block;
  padding: 6px 22px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.risk-very-high { background: rgba(239,68,68,0.15);  color: #fca5a5; border: 1px solid rgba(239,68,68,0.35); }
.risk-high      { background: rgba(249,115,22,0.15); color: #fdba74; border: 1px solid rgba(249,115,22,0.35); }
.risk-medium    { background: rgba(245,158,11,0.15); color: #fcd34d; border: 1px solid rgba(245,158,11,0.35); }
.risk-low       { background: rgba(16,185,129,0.15); color: #6ee7b7; border: 1px solid rgba(16,185,129,0.3); }
.risk-very-low  { background: rgba(16,185,129,0.10); color: #34d399; border: 1px solid rgba(16,185,129,0.2); }

.fraud-prob { font-size: 2.8rem; font-weight: 800; color: var(--text); line-height: 1; }
.score-card { background: #0d1117; border: 1px solid var(--border-hi); border-radius: 10px; padding: 14px; }
.score-val   { font-size: 1.25rem; font-weight: 800; color: var(--accent-hi); }
.score-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 3px; }

/* ── Future Work ─────────────────────────────────────────────────────────── */
.future-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  height: 100%;
}
.future-card h6 { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.future-card p  { color: var(--text-dim); font-size: 0.875rem; margin: 0; }

/* ── Alert ───────────────────────────────────────────────────────────────── */
.alert-warning { background: rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.3); color: var(--amber); }

/* ── Footer ──────────────────────────────────────────────────────────────── */
footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ── Plotly overrides ────────────────────────────────────────────────────── */
.js-plotly-plot .plotly .modebar { display: none !important; }