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

:root {
  --ink:      #0e0e12;
  --bg:       #f5f3ee;
  --cream:    #ede9e0;
  --gold:     #c8993a;
  --gold-lt:  #e8c46a;
  --gold-dark: #a07725;
  --red:      #c0392b;
  --green:    #1a7a4a;
  --blue:     #1e5f9c;
  --purple:   #6a4c93;
  --muted:    #7a7060;
  --border:   #d6d0c4;
  --card-bg:  #ffffff;
  --mono: 'DM Mono', monospace;
  --serif: 'DM Serif Display', serif;
  --sans: 'Instrument Sans', sans-serif;
  --radius: 12px;
  --shadow: 0 2px 20px rgba(14,14,18,.07);
  --shadow-lg: 0 10px 40px rgba(14,14,18,.12);
  --shadow-xl: 0 20px 60px rgba(14,14,18,.18);
  --glow-gold: 0 0 20px rgba(200,153,58,.3);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: linear-gradient(135deg, #f5f3ee 0%, #ede9e0 100%);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 400px;
  background: radial-gradient(ellipse at top, rgba(200,153,58,.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

/* ─── HERO ──────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #0e0e12 0%, #1a1a20 100%);
  color: #f5f3ee;
  padding: 100px 5vw 80px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 28px,
    rgba(200,153,58,.06) 28px,
    rgba(200,153,58,.06) 29px
  );
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(200,153,58,.15) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.1); }
}
.hero-tag {
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid rgba(200,153,58,.3);
  border-radius: 4px;
  background: rgba(200,153,58,.1);
  backdrop-filter: blur(10px);
  animation: fadeInUp .6s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(2.8rem, 7vw, 6rem);
  line-height: 1.05;
  color: #f5f3ee;
  margin-bottom: 24px;
  animation: fadeInUp .8s ease .2s backwards;
  text-shadow: 0 2px 30px rgba(200,153,58,.3);
}
.hero-title em {
  font-style: italic;
  background: linear-gradient(135deg, var(--gold-lt) 0%, var(--gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}
.hero-sub {
  font-size: 1.05rem;
  color: #c8c0b0;
  max-width: 520px;
  margin-bottom: 36px;
  animation: fadeInUp 1s ease .4s backwards;
}
.hero-tasks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
  animation: fadeInUp 1.2s ease .6s backwards;
}
.task-pill {
  background: rgba(200,153,58,.15);
  border: 1px solid rgba(200,153,58,.35);
  color: var(--gold-lt);
  font-family: var(--mono);
  font-size: .8rem;
  padding: 8px 16px;
  border-radius: 100px;
  letter-spacing: .05em;
  backdrop-filter: blur(10px);
  transition: all .3s ease;
  cursor: default;
}
.task-pill:hover {
  background: rgba(200,153,58,.25);
  border-color: rgba(200,153,58,.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(200,153,58,.2);
}
.scroll-hint {
  font-family: var(--mono);
  font-size: .75rem;
  color: #6e6860;
  letter-spacing: .1em;
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(5px); }
}

/* ─── TAB NAV ───────────────────────────────────────────── */
.tab-nav {
  display: flex;
  background: var(--ink);
  border-bottom: 2px solid var(--gold);
  position: sticky;
  top: 0;
  z-index: 100;
  overflow-x: auto;
}
.tab-btn {
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #7a7060;
  background: none;
  border: none;
  padding: 14px 28px;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all .3s ease;
  position: relative;
}
.tab-btn::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background: var(--gold);
  transform: translateX(-50%);
  transition: width .3s ease;
}
.tab-btn:hover { 
  color: #f5f3ee;
  background: rgba(200,153,58,.05);
}
.tab-btn.active {
  color: var(--gold);
  background: rgba(200,153,58,.08);
}
.tab-btn.active::before {
  width: 100%;
}
.tab-btn.active::before {
  width: 100%;
}

/* ─── CONTENT / PANELS ──────────────────────────────────── */
.content { max-width: 1100px; margin: 0 auto; padding: 0 5vw 80px; }

.tab-panel { display: none; animation: fadeIn .35s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:none; } }
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-lt));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: rgba(200,153,58,.3);
}
.card:hover::before {
  transform: scaleX(1);
  transition: color .2s, border-color .2s;
}
.tab-btn:hover { color: #f5f3ee; }
.tab-btn.active {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ─── CONTENT / PANELS ──────────────────────────────────── */
.content { max-width: 1100px; margin: 0 auto; padding: 0 5vw 80px; }

.tab-panel { display: none; animation: fadeIn .35s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:none; } }

.panel-header {
  padding: 48px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}
.panel-header h2 {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--ink);
  margin-bottom: 6px;
}
.panel-header p { color: var(--muted); font-size: .95rem; }

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  border: 3px solid var(--card-bg);
  box-shadow: 0 0 0 1px var(--gold), 0 2px 8px rgba(200,153,58,.4);
  cursor: grab;
  transition: all .2s ease;
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 0 1px var(--gold), var(--glow-gold), 0 4px 12px rgba(200,153,58,.5);
}
input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.1);
}

/* ─── CARDS ─────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.card h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--ink);
}

/* ─── SLIDERS / LABELS ──────────────────────────────────── */
label {
  display: block;
  font-size: .82rem;
  font-family: var(--mono);
  letter-spacing: .05em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
}
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(to right, var(--gold) 0%, var(--border) 0%);
  outline: none;
  cursor: pointer;
}
.val {
  font-family: var(--mono);
  font-size: .88rem;
  color: var(--ink);
  min-width: 52px;
  text-align: right;
}

/* ─── CONSTRUCT GRID ────────────────────────────────────── */
.construct-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 700px) { .construct-grid { grid-template-columns: 1fr; } }

/* ─── SUMMARY GRID ──────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}
.stat-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  transition: all .3s ease;
  position: relative;
}
.stat-block:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(14,14,18,.08);
}
.stat-block.highlight {
  background: linear-gradient(135deg, #0e0e12 0%, #1a1a20 100%);
  border-color: var(--gold);
  box-shadow: 0 4px 16px rgba(200,153,58,.15);
}
.stat-block.highlight::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 8px;
  padding: 1px;
  background: linear-gradient(135deg, var(--gold), var(--gold-lt));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: .5;
}
.stat-block.highlight .stat-label { color: #8a8070; }
.stat-block.highlight .stat-value { 
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;

  text-transform: uppercase;
  margin-bottom: 18px;
}
.slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
}
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(to right, var(--gold) 0%, var(--border) 0%);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--gold);
  border: 3px solid var(--card-bg);
  box-shadow: 0 0 0 2px var(--gold);
}
.val {
  font-family: var(--mono);
  font-size: .88rem;
  color: var(--ink);
  min-width: 52px;
  text-align: right;
}

/* ─── CONSTRUCT GRID ────────────────────────────────────── */
.construct-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 700px) { .construct-grid { grid-template-columns: 1fr; } }

/* ─── SUMMARY GRID ──────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}
.stat-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.stat-block.highlight {
  background: var(--ink);
  border-color: var(--ink);
}
.stat-block.highlight .stat-label { color: #7a7060; }
.stat-block.highlight .stat-value { color: var(--gold-lt); }
.stat-label {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.stat-value {
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
}
.stat-value.loss { color: var(--red); }

/* Protection bar */
.protection-bar-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}
.pb-label {
  font-family: var(--mono);
  font-size: .7rem;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.pb-track {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.pb-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--green));
  border-radius: 4px;
  transition: width .4s ease;
  position: relative;
  overflow: hidden;
}
.pb-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.3), transparent);
  animation: shimmer 2s infinite;
}
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
.pb-pct {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--ink);
  min-width: 36px;
  text-align: right;
}

/* ─── CHART ─────────────────────────────────────────────── */
.chart-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 16px;
}
.chart-controls label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: 0;
  cursor: pointer;
}
.chart-controls input[type="checkbox"] {
  accent-color: var(--gold);
  width: 14px; height: 14px;
  cursor: pointer;
}
.chart-container {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all .3s ease;
}
.chart-container:hover {
  box-shadow: var(--shadow-lg);
}
#payoffCanvas { width: 100% !important; display: block; }
.crosshair-tooltip {
  position: absolute;
  background: linear-gradient(135deg, #0e0e12 0%, #1a1a20 100%);
  color: #f5f3ee;
  font-family: var(--mono);
  font-size: .75rem;
  padding: 10px 14px;
  border-radius: 8px;
  pointer-events: none;
  display: none;
  white-space: pre;
  line-height: 1.7;
  border: 1px solid var(--gold);
  box-shadow: 0 4px 20px rgba(200,153,58,.3), var(--glow-gold);
  z-index: 10;
  backdrop-filter: blur(10px);
  animation: tooltipIn .2s ease;
}
@keyframes tooltipIn {
  from { opacity: 0; transform: scale(.9); }
  to { opacity: 1; transform: scale(1); }
}
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 14px;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--muted);
}
.legend-swatch {
  width: 22px; height: 3px;
  border-radius: 2px;
}

/* ─── COMPARE ───────────────────────────────────────────── */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 36px;
}
@media (max-width: 700px) { .compare-grid { grid-template-columns: 1fr; } }

.compare-table { width: 100%; border-collapse: collapse; margin-top: 16px; }
.ct-header, .ct-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: .8rem;
}
.ct-header { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; }
.ct-row.highlight { background: rgba(200,153,58,.07); border-radius: 6px; padding: 8px 6px; }
.ct-row span:nth-child(2) { color: var(--red); }
.ct-row span:nth-child(3) { color: var(--green); }
.ct-row.highlight span:nth-child(3) { font-weight: 600; }

.insight-block { display: flex; flex-direction: column; gap: 14px; }
.insight-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px;
  border-radius: 10px;
  background: linear-gradient(135deg, #fefdfb 0%, var(--bg) 100%);
  border-left: 4px solid var(--gold);
  font-size: .88rem;
  box-shadow: 0 2px 8px rgba(14,14,18,.04);
  transition: all .3s ease;
}
.insight-item:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 16px rgba(14,14,18,.08);
  border-left-color: var(--gold-lt);
}
.insight-icon { 
  font-size: 1.4rem; 
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,.1));
}

.tradeoff-chart-wrap {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: all .3s ease;
}
.tradeoff-chart-wrap:hover {
  box-shadow: var(--shadow-lg);
}
.tradeoff-chart-wrap h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin-bottom: 16px;
}
#tradeoffCanvas { width: 100% !important; display: block; }

.hint { font-size: .82rem; color: var(--muted); margin-bottom: 16px; }

/* ─── EXPLAINER ─────────────────────────────────────────── */
.explainer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.exp-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: all .4s cubic-bezier(.25,.46,.45,.94);
  cursor: default;
  position: relative;
  overflow: hidden;
}
.exp-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--gold), var(--purple));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s ease;
}
.exp-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(200,153,58,.4);
}
.exp-card:hover::before {
  transform: scaleX(1);
}
.exp-number {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .15em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: inline-block;
  padding: 4px 10px;
  background: rgba(200,153,58,.1);
  border-radius: 4px;
  border: 1px solid rgba(200,153,58,.2);
}
.exp-card h4 {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--ink);
}
.exp-card p {
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 16px;
}
.formula-box {
  background: linear-gradient(135deg, #0e0e12 0%, #1a1a20 100%);
  color: var(--gold-lt);
  font-family: var(--mono);
  font-size: .84rem;
  padding: 12px 18px;
  border-radius: 8px;
  letter-spacing: .04em;
  border: 1px solid rgba(200,153,58,.3);
  box-shadow: inset 0 1px 3px rgba(0,0,0,.2), 0 2px 8px rgba(200,153,58,.15);
  position: relative;
  overflow: hidden;
}
.formula-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(200,153,58,.1), transparent);
  animation: formulaShine 3s infinite;
}
@keyframes formulaShine {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}

/* ─── FOOTER ────────────────────────────────────────────── */
.site-footer {
  background: linear-gradient(135deg, #0e0e12 0%, #1a1a20 100%);
  color: #6a6050;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-align: center;
  padding: 24px;
  text-transform: uppercase;
  border-top: 1px solid rgba(200,153,58,.2);
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ─── SCROLLBAR ─────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { 
  background: linear-gradient(135deg, var(--gold), var(--gold-dark)); 
  border-radius: 4px;
  transition: background .3s ease;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--gold-lt), var(--gold));
}

/* ─── SELECTION ─────────────────────────────────────────── */
::selection {
  background: rgba(200,153,58,.3);
  color: var(--ink);
}

/* ─── LOADING ANIMATION ─────────────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

/* ─── RESPONSIVE TWEAKS ─────────────────────────────────── */
@media (max-width: 700px) {
  .hero {
    padding: 60px 5vw 50px;
  }
  .hero-title {
    font-size: clamp(2rem, 10vw, 3rem);
  }
  .tab-btn {
    padding: 12px 20px;
    font-size: .75rem;
  }
  .card {
    padding: 20px;
  }
}

.exp-card h4 {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--ink);
}
.exp-card p {
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 16px;
}
.formula-box {
  background: var(--ink);
  color: var(--gold-lt);
  font-family: var(--mono);
  font-size: .82rem;
  padding: 10px 16px;
  border-radius: 6px;
  letter-spacing: .04em;
}

/* ─── FOOTER ────────────────────────────────────────────── */
.site-footer {
  background: var(--ink);
  color: #4a4640;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-align: center;
  padding: 18px;
  text-transform: uppercase;
}

/* ─── SCROLLBAR ─────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }