/* =========================================================
   Options Strategy Atlas — dark editorial trading desk
   ========================================================= */

:root {
  /* Palette — warm dark, ink-on-parchment-inverted */
  --bg: #0f0e0c;
  --bg-2: #16140f;
  --bg-3: #1d1a15;
  --panel: #1a1814;
  --panel-2: #221f19;
  --border: #2c2922;
  --border-2: #3a362d;
  --ink: #ece5d5;
  --ink-2: #c4bca8;
  --ink-3: #897f6c;
  --ink-4: #5a5345;

  /* Position semantics */
  --long: #7fbf68;       /* sage green */
  --long-soft: #7fbf6822;
  --short: #d96d57;      /* terracotta */
  --short-soft: #d96d5722;
  --neutral: #d4a544;    /* warm gold */
  --neutral-soft: #d4a54422;

  /* Cash flow */
  --credit: #7fbf68;
  --debit: #d96d57;
  --zero: #c4bca8;

  /* Categorical accents */
  --bullish: #7fbf68;
  --bearish: #d96d57;
  --volatility: #b48ead;
  --hybrid: #d4a544;

  /* Skill */
  --novice: #6ba59f;
  --intermediate: #d4a544;
  --advanced: #d96d57;
  --expert: #b48ead;

  /* Fonts */
  --f-display: 'Fraunces', 'Times New Roman', Georgia, serif;
  --f-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --f-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--f-sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
  font-weight: 300;
  letter-spacing: 0.005em;
  overflow-x: hidden;
}

/* Subtle film grain over everything */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* =========================================================
   Masthead
   ========================================================= */
.masthead {
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(212, 165, 68, 0.06), transparent 50%),
    radial-gradient(ellipse at 90% 100%, rgba(180, 142, 173, 0.04), transparent 50%),
    var(--bg-2);
  padding: 32px 48px 28px;
}

.masthead-inner {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.brand-mark {
  font-family: var(--f-display);
  font-size: 56px;
  line-height: 0.85;
  color: var(--neutral);
  font-weight: 300;
  transform: translateY(4px);
}

.brand-text h1 {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: 38px;
  line-height: 1.05;
  letter-spacing: -0.018em;
  color: var(--ink);
  font-variation-settings: "opsz" 80;
}

.brand-text .sub {
  margin-top: 6px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-text .sub span {
  color: var(--neutral);
  font-weight: 500;
}

.stats {
  display: flex;
  gap: 28px;
  align-items: baseline;
}

.stat {
  text-align: right;
}

.stat-label {
  display: block;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 4px;
}

.stat-value {
  display: block;
  font-family: var(--f-display);
  font-size: 32px;
  font-weight: 400;
  color: var(--ink);
  font-variation-settings: "opsz" 80;
}

/* =========================================================
   Main layout
   ========================================================= */
main {
  max-width: 1600px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
  padding: 36px 48px 48px;
  align-items: start;
}

/* =========================================================
   Filters sidebar
   ========================================================= */
.filters {
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding-right: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}

.filters::-webkit-scrollbar { width: 5px; }
.filters::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }

.filter-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}

.filter-head h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.reset-btn {
  background: transparent;
  color: var(--ink-3);
  border: 1px solid var(--border-2);
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.18s ease;
}

.reset-btn:hover {
  color: var(--ink);
  border-color: var(--ink-3);
  background: var(--bg-3);
}

.filter-search {
  margin-bottom: 24px;
}

#searchInput {
  width: 100%;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 10px 12px;
  font-family: var(--f-sans);
  font-size: 13.5px;
  font-weight: 300;
  border-radius: 2px;
  transition: border-color 0.18s ease;
}

#searchInput:focus {
  outline: none;
  border-color: var(--neutral);
  background: var(--bg-3);
}

#searchInput::placeholder { color: var(--ink-4); font-style: italic; }

.filter-group {
  margin-bottom: 22px;
}

.filter-group h3 {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 9px;
  font-weight: 500;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.chip {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 400;
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--ink-2);
  padding: 4px 9px;
  cursor: pointer;
  border-radius: 2px;
  transition: all 0.15s ease;
  letter-spacing: 0.01em;
  user-select: none;
}

.chip:hover { border-color: var(--ink-3); color: var(--ink); }

.chip.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
  font-weight: 500;
}

.chip.greek-long.active { background: var(--long); border-color: var(--long); color: var(--bg); }
.chip.greek-short.active { background: var(--short); border-color: var(--short); color: var(--bg); }
.chip.greek-neutral.active { background: var(--neutral); border-color: var(--neutral); color: var(--bg); }

/* =========================================================
   Results
   ========================================================= */
.results-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.results-head h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 24px;
  letter-spacing: -0.01em;
}

.sort-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sort-controls label {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

#sortSelect {
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--ink);
  font-family: var(--f-mono);
  font-size: 12px;
  padding: 5px 8px;
  border-radius: 2px;
  cursor: pointer;
}

#sortSelect:focus { outline: none; border-color: var(--neutral); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 18px;
}

/* =========================================================
   Strategy card
   ========================================================= */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 18px 18px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 220px;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--border-2);
  transition: background 0.2s ease;
}

.card[data-purpose-class="bullish"]::before { background: var(--bullish); }
.card[data-purpose-class="bearish"]::before { background: var(--bearish); }
.card[data-purpose-class="volatility"]::before { background: var(--volatility); }
.card[data-purpose-class="hybrid"]::before { background: var(--hybrid); }

.card:hover {
  background: var(--panel-2);
  border-color: var(--ink-4);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.card-name {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 19px;
  line-height: 1.15;
  letter-spacing: -0.008em;
  color: var(--ink);
  font-variation-settings: "opsz" 30;
}

.card-skill {
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 2px;
  white-space: nowrap;
  font-weight: 500;
  flex-shrink: 0;
}

.card-skill[data-skill="Novice"] { background: var(--novice); color: var(--bg); }
.card-skill[data-skill="Intermediate"] { background: var(--intermediate); color: var(--bg); }
.card-skill[data-skill="Advanced"] { background: var(--advanced); color: var(--bg); }
.card-skill[data-skill="Expert"] { background: var(--expert); color: var(--bg); }

.card-nickname {
  font-family: var(--f-sans);
  font-size: 12px;
  font-style: italic;
  color: var(--ink-3);
  margin-bottom: 14px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-nickname:empty::before {
  content: '— no alias —';
  color: var(--ink-4);
  font-style: italic;
  opacity: 0.5;
}

.greeks {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 12px;
}

.greek {
  text-align: center;
  padding: 7px 4px;
  border: 1px solid var(--border-2);
  border-radius: 2px;
  background: var(--bg-2);
}

.greek-label {
  display: block;
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 3px;
}

.greek-value {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.greek-value[data-pos="Long"] { color: var(--long); }
.greek-value[data-pos="Short"] { color: var(--short); }
.greek-value[data-pos="Neutral"] { color: var(--neutral); }
.greek-value[data-pos="Mixed"] { color: var(--ink-3); }

.card-meta {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
}

.card-meta .cash[data-flow="Credit"] { color: var(--credit); }
.card-meta .cash[data-flow="Debit"] { color: var(--debit); }
.card-meta .cash[data-flow*="Zero"] { color: var(--zero); }

.card-meta .legs {
  color: var(--ink-3);
}

.card-meta .legs strong {
  font-weight: 600;
  color: var(--ink-2);
}

/* =========================================================
   Modal / Detail view
   ========================================================= */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal[hidden] { display: none; }

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border-2);
  max-width: 920px;
  width: calc(100% - 40px);
  max-height: calc(100vh - 60px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
  animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
}

.modal-panel::-webkit-scrollbar { width: 6px; }
.modal-panel::-webkit-scrollbar-thumb { background: var(--border-2); }

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--ink-3);
  width: 32px;
  height: 32px;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: all 0.18s ease;
  border-radius: 2px;
  z-index: 2;
}

.modal-close:hover {
  color: var(--ink);
  border-color: var(--ink-3);
  background: var(--bg-3);
}

.modal-content { padding: 40px 48px 36px; }

.detail-head { margin-bottom: 28px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }

.detail-eyebrow {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.detail-eyebrow .dot {
  width: 4px; height: 4px; background: var(--ink-4); border-radius: 50%;
}

.detail-name {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: 42px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-variation-settings: "opsz" 100;
  margin-bottom: 12px;
}

.detail-nickname {
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 300;
  font-size: 16px;
  color: var(--ink-2);
  line-height: 1.45;
  font-variation-settings: "opsz" 40;
}

.detail-nickname:empty { display: none; }

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  margin-bottom: 32px;
}

@media (max-width: 720px) {
  .detail-grid { grid-template-columns: 1fr; gap: 28px; }
}

.detail-section h3 {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
  font-weight: 500;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.attr-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.attr {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--f-mono);
  font-size: 12.5px;
}

.attr-key { color: var(--ink-3); }
.attr-val { color: var(--ink); font-weight: 500; text-align: right; max-width: 60%; }
.attr-val.long { color: var(--long); }
.attr-val.short { color: var(--short); }
.attr-val.neutral { color: var(--neutral); }
.attr-val.credit { color: var(--credit); }
.attr-val.debit { color: var(--debit); }

/* Legs */
.legs-section {
  margin-bottom: 32px;
}

.legs-section h3 {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
  font-weight: 500;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.legs-table {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
}

.leg-row {
  display: grid;
  grid-template-columns: 40px 1fr 1fr;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  gap: 16px;
  transition: background 0.15s ease;
}

.leg-row:last-child { border-bottom: none; }
.leg-row:hover { background: var(--bg-3); }

.leg-num {
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 400;
  color: var(--ink-4);
  font-variation-settings: "opsz" 60;
}

.leg-construction {
  font-family: var(--f-mono);
  font-size: 13.5px;
  color: var(--ink);
  font-weight: 500;
}

.leg-construction.long { color: var(--long); }
.leg-construction.short { color: var(--short); }

.leg-effect {
  font-family: var(--f-sans);
  font-size: 12.5px;
  color: var(--ink-2);
  font-style: italic;
}

/* Payoff chart */
.payoff-section { margin-bottom: 12px; }

.payoff-section h3 {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
  font-weight: 500;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.payoff-wrap {
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 16px;
  position: relative;
}

.payoff-svg {
  width: 100%;
  height: auto;
  display: block;
}

.payoff-caveat {
  font-family: var(--f-sans);
  font-size: 11.5px;
  font-style: italic;
  color: var(--ink-3);
  margin-top: 10px;
  line-height: 1.5;
}

/* =========================================================
   Empty / footer
   ========================================================= */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-3);
  font-style: italic;
}
.empty p { margin-bottom: 18px; }

footer {
  border-top: 1px solid var(--border);
  margin-top: 36px;
  padding: 24px 48px 36px;
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--ink-3);
}

footer code {
  background: var(--bg-3);
  padding: 1px 6px;
  color: var(--ink-2);
}

footer .caveat {
  margin-top: 8px;
  font-style: italic;
  color: var(--ink-4);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 980px) {
  main {
    grid-template-columns: 1fr;
    padding: 24px 24px 32px;
    gap: 24px;
  }
  .filters {
    position: relative;
    top: 0;
    max-height: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 24px;
  }
  .masthead { padding: 24px 24px 22px; }
  .brand-text h1 { font-size: 28px; }
  .brand-mark { font-size: 42px; }
  .stat-value { font-size: 24px; }
  footer { padding: 20px 24px 28px; }
}

@media (max-width: 560px) {
  .modal-content { padding: 28px 24px 28px; }
  .detail-name { font-size: 30px; }
  .masthead-inner { gap: 18px; }
  .stats { gap: 18px; }
  .greeks { gap: 4px; }
  .greek { padding: 5px 2px; }
  .greek-value { font-size: 10px; }
  .leg-row { grid-template-columns: 28px 1fr; gap: 10px; }
  .leg-effect { grid-column: 2; font-size: 11.5px; }
}