/* ═══════════════════════════════════════════════
   PROTECTIVE PUT STRATEGY — VISUAL REDESIGN
   Theme: Deep finance dashboard · Vibrant & clean
═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=JetBrains+Mono:wght@300;400;500;600&family=Manrope:wght@300;400;500;600;700&display=swap');

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

:root {
  --bg:         #060b14;
  --bg2:        #0c1525;
  --bg3:        #111e33;
  --surface:    rgba(255,255,255,0.04);
  --surface2:   rgba(255,255,255,0.07);
  --border:     rgba(255,255,255,0.08);
  --border2:    rgba(255,255,255,0.14);

  --cyan:       #00d4ff;
  --cyan-dim:   rgba(0,212,255,0.10);
  --cyan-glow:  rgba(0,212,255,0.35);
  --teal:       #00c9a7;
  --teal-dim:   rgba(0,201,167,0.10);
  --violet:     #a78bfa;
  --violet-dim: rgba(167,139,250,0.10);
  --amber:      #fbbf24;
  --amber-dim:  rgba(251,191,36,0.10);
  --rose:       #f43f5e;
  --rose-dim:   rgba(244,63,94,0.10);
  --green:      #34d399;
  --green-dim:  rgba(52,211,153,0.10);

  --text:       #e2e8f0;
  --text-dim:   #4a5568;
  --text-mid:   #94a3b8;

  --serif: 'Syne', sans-serif;
  --mono:  'JetBrains Mono', monospace;
  --body:  'Manrope', sans-serif;
  --radius: 16px;
  --radius-sm: 10px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 15% 10%, rgba(0,212,255,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 85% 85%, rgba(167,139,250,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 50% 50%, rgba(0,201,167,0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ══════════════════════════════════════════════════════
   HERO
══════════════════════════════════════════════════════ */
.hero {
  position: relative;
  z-index: 1;
  padding: 80px 6vw 68px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.035) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 90% 80% at 40% 40%, black 20%, transparent 80%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 90px;
  background: linear-gradient(to bottom, transparent, var(--bg));
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,.2);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 30px;
  animation: fadeSlideUp .6s ease both;
}
.hero-tag::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--cyan);
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100% { opacity:1; } 50% { opacity:.3; } }

.hero-title {
  font-family: var(--serif);
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 800;
  line-height: 1.0;
  color: #fff;
  margin-bottom: 24px;
  animation: fadeSlideUp .6s .1s ease both;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(120deg, var(--cyan) 0%, var(--teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-mid);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 36px;
  font-weight: 300;
  animation: fadeSlideUp .6s .2s ease both;
}

.hero-tasks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 52px;
  animation: fadeSlideUp .6s .3s ease both;
}
.task-pill {
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 100px;
  border: 1px solid;
  cursor: default;
  transition: transform .2s, box-shadow .2s;
}
.task-pill:hover { transform: translateY(-3px); }
.task-pill:nth-child(1) { color: var(--cyan);   border-color: rgba(0,212,255,.3);   background: var(--cyan-dim); }
.task-pill:nth-child(2) { color: var(--violet); border-color: rgba(167,139,250,.3); background: var(--violet-dim); }
.task-pill:nth-child(3) { color: var(--teal);   border-color: rgba(0,201,167,.3);   background: var(--teal-dim); }

.scroll-hint {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-dim);
  letter-spacing: .12em;
  animation: bounce 2.4s ease-in-out infinite, fadeSlideUp .6s .4s ease both;
}
@keyframes bounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(7px); } }
@keyframes fadeSlideUp { from { opacity:0; transform:translateY(18px); } to { opacity:1; transform:none; } }

/* ══════════════════════════════════════════════════════
   TAB NAV
══════════════════════════════════════════════════════ */
.tab-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  background: rgba(6,11,20,.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: none;
  border: none;
  padding: 18px 28px;
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  transition: color .2s;
}
.tab-btn::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%; right: 50%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--teal));
  border-radius: 2px 2px 0 0;
  transition: left .3s, right .3s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--cyan); }
.tab-btn.active::after { left: 18px; right: 18px; }

/* ══════════════════════════════════════════════════════
   CONTENT
══════════════════════════════════════════════════════ */
.content {
  position: relative;
  z-index: 1;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 5vw 100px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: panelIn .4s ease; }
@keyframes panelIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:none; } }

.panel-header { padding: 52px 0 32px; }
.panel-header h2 {
  font-family: var(--serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.panel-header p { color: var(--text-mid); font-size: .95rem; font-weight: 300; }

/* ══════════════════════════════════════════════════════
   CARDS
══════════════════════════════════════════════════════ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 32px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color .3s, box-shadow .3s;
}
.card:hover {
  border-color: var(--border2);
  box-shadow: 0 12px 48px rgba(0,0,0,.35);
}
.card h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.card h3::before {
  content: '';
  display: inline-block;
  width: 3px; height: 18px;
  background: linear-gradient(180deg, var(--cyan), var(--teal));
  border-radius: 2px;
  flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════
   SLIDERS
══════════════════════════════════════════════════════ */
label {
  display: block;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 22px;
}
.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 10px;
}
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--bg3);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--teal));
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--cyan), 0 0 14px var(--cyan-glow);
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.3);
  box-shadow: 0 0 0 3px var(--cyan), 0 0 22px var(--cyan-glow);
}
.val {
  font-family: var(--mono);
  font-size: .88rem;
  font-weight: 600;
  color: var(--cyan);
  min-width: 58px;
  text-align: right;
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,.18);
  padding: 4px 9px;
  border-radius: 6px;
}

/* ══════════════════════════════════════════════════════
   CONSTRUCT TAB
══════════════════════════════════════════════════════ */
.construct-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 24px;
}
@media (max-width: 720px) { .construct-grid { grid-template-columns: 1fr; } }

.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}
.stat-block {
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  border: 1px solid var(--border);
  background: var(--bg2);
  position: relative;
  overflow: hidden;
  transition: transform .2s, border-color .2s;
}
.stat-block:hover { transform: translateY(-2px); border-color: var(--border2); }
.stat-block::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--teal));
  opacity: 0;
  transition: opacity .25s;
}
.stat-block:hover::after { opacity: 1; }
.stat-block.highlight {
  background: linear-gradient(135deg, rgba(0,212,255,.08), rgba(0,201,167,.06));
  border-color: rgba(0,212,255,.2);
}
.stat-block.highlight::after { opacity: 1; }
.stat-label {
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.stat-value {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
}
.stat-block.highlight .stat-value { color: var(--cyan); }
.stat-value.loss { color: var(--rose); }

.protection-bar-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.pb-label { font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); white-space: nowrap; }
.pb-track { flex:1; height: 8px; background: var(--bg3); border-radius: 4px; overflow: hidden; }
.pb-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--rose), var(--amber), var(--teal));
  border-radius: 4px;
  transition: width .5s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 0 12px rgba(0,201,167,.5);
}
.pb-pct { font-family: var(--mono); font-size: .82rem; font-weight: 600; color: var(--teal); min-width: 40px; text-align: right; }

/* ══════════════════════════════════════════════════════
   PAYOFF CHART TAB
══════════════════════════════════════════════════════ */
.chart-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}
.chart-controls label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-mid);
  margin-bottom: 0;
  cursor: pointer;
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  transition: border-color .2s, background .2s, color .2s;
}
.chart-controls label:hover { border-color: var(--border2); color: var(--text); background: var(--surface2); }
.chart-controls input[type="checkbox"] { accent-color: var(--cyan); width: 13px; height: 13px; cursor: pointer; }

.chart-container {
  position: relative;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px 12px;
  overflow: hidden;
}
.chart-container::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet), var(--teal));
}
#payoffCanvas { width: 100% !important; display: block; cursor: crosshair; }

.crosshair-tooltip {
  position: absolute;
  background: rgba(12,21,37,.95);
  color: var(--text);
  font-family: var(--mono);
  font-size: .74rem;
  line-height: 1.75;
  padding: 12px 16px;
  border-radius: 10px;
  pointer-events: none;
  display: none;
  white-space: pre;
  border: 1px solid var(--border2);
  box-shadow: 0 8px 32px rgba(0,0,0,.6), 0 0 0 1px rgba(0,212,255,.12);
  z-index: 10;
}

.chart-legend { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 16px; padding: 0 4px; }
.legend-item { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: .7rem; color: var(--text-mid); }
.legend-swatch { width: 24px; height: 3px; border-radius: 2px; }

/* ══════════════════════════════════════════════════════
   COMPARE TAB
══════════════════════════════════════════════════════ */
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 28px; }
@media (max-width: 720px) { .compare-grid { grid-template-columns: 1fr; } }

.hint { font-size: .82rem; color: var(--text-dim); margin-bottom: 16px; font-style: italic; }
.compare-table { margin-top: 16px; }
.ct-header, .ct-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 8px;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: .78rem;
  align-items: center;
}
.ct-header { color: var(--text-dim); font-size: .65rem; text-transform: uppercase; letter-spacing: .1em; }
.ct-row { transition: background .15s; border-radius: 6px; }
.ct-row:hover { background: var(--surface); }
.ct-row span:nth-child(1) { color: var(--text-mid); }
.ct-row.highlight {
  background: linear-gradient(90deg, rgba(0,212,255,.06), transparent);
  border: 1px solid rgba(0,212,255,.14);
  border-radius: 8px;
  margin-top: 4px;
}

.insight-block { display: flex; flex-direction: column; gap: 12px; }
.insight-item {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--bg2);
  border: 1px solid var(--border);
  font-size: .85rem;
  color: var(--text-mid);
  line-height: 1.6;
  transition: border-color .2s, transform .2s;
}
.insight-item:hover { border-color: var(--border2); transform: translateX(3px); }
.insight-icon { font-size: 1.2rem; line-height: 1; flex-shrink: 0; }

.tradeoff-chart-wrap {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  overflow: hidden;
  position: relative;
}
.tradeoff-chart-wrap::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--amber), var(--rose));
}
.tradeoff-chart-wrap h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.tradeoff-chart-wrap h3::before {
  content: '';
  display: inline-block;
  width: 3px; height: 16px;
  background: linear-gradient(180deg, var(--amber), var(--rose));
  border-radius: 2px;
}
#tradeoffCanvas { width: 100% !important; display: block; }

/* ══════════════════════════════════════════════════════
   EXPLAINER TAB
══════════════════════════════════════════════════════ */
.explainer-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }

.exp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  position: relative;
  overflow: hidden;
  cursor: default;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.exp-card::before {
  content: ''; position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
}
.exp-card[data-idx="0"]::before { background: linear-gradient(90deg, var(--cyan), var(--teal)); }
.exp-card[data-idx="1"]::before { background: linear-gradient(90deg, var(--violet), var(--cyan)); }
.exp-card[data-idx="2"]::before { background: linear-gradient(90deg, var(--teal), var(--green)); }
.exp-card[data-idx="3"]::before { background: linear-gradient(90deg, var(--amber), var(--teal)); }
.exp-card[data-idx="4"]::before { background: linear-gradient(90deg, var(--rose), var(--violet)); }
.exp-card[data-idx="5"]::before { background: linear-gradient(90deg, var(--cyan), var(--amber)); }

.exp-card:hover { transform: translateY(-5px); border-color: var(--border2); }
.exp-card[data-idx="0"]:hover { box-shadow: 0 16px 48px rgba(0,212,255,.12); }
.exp-card[data-idx="1"]:hover { box-shadow: 0 16px 48px rgba(167,139,250,.12); }
.exp-card[data-idx="2"]:hover { box-shadow: 0 16px 48px rgba(0,201,167,.12); }
.exp-card[data-idx="3"]:hover { box-shadow: 0 16px 48px rgba(251,191,36,.12); }
.exp-card[data-idx="4"]:hover { box-shadow: 0 16px 48px rgba(244,63,94,.12); }
.exp-card[data-idx="5"]:hover { box-shadow: 0 16px 48px rgba(0,212,255,.12); }

.exp-number { font-family: var(--mono); font-size: .65rem; letter-spacing: .2em; text-transform: uppercase; margin-bottom: 12px; font-weight: 600; }
.exp-card[data-idx="0"] .exp-number { color: var(--cyan); }
.exp-card[data-idx="1"] .exp-number { color: var(--violet); }
.exp-card[data-idx="2"] .exp-number { color: var(--teal); }
.exp-card[data-idx="3"] .exp-number { color: var(--amber); }
.exp-card[data-idx="4"] .exp-number { color: var(--rose); }
.exp-card[data-idx="5"] .exp-number { color: var(--cyan); }

.exp-card h4 { font-family: var(--serif); font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 12px; }
.exp-card p { font-size: .86rem; color: var(--text-mid); line-height: 1.7; margin-bottom: 18px; font-weight: 300; }
.exp-card p strong { color: var(--text); font-weight: 600; }

.formula-box { font-family: var(--mono); font-size: .8rem; font-weight: 500; padding: 12px 16px; border-radius: 8px; letter-spacing: .04em; }
.exp-card[data-idx="0"] .formula-box { background: var(--cyan-dim);   color: var(--cyan);   border: 1px solid rgba(0,212,255,.18); }
.exp-card[data-idx="1"] .formula-box { background: var(--violet-dim); color: var(--violet); border: 1px solid rgba(167,139,250,.18); }
.exp-card[data-idx="2"] .formula-box { background: var(--teal-dim);   color: var(--teal);   border: 1px solid rgba(0,201,167,.18); }
.exp-card[data-idx="3"] .formula-box { background: var(--amber-dim);  color: var(--amber);  border: 1px solid rgba(251,191,36,.18); }
.exp-card[data-idx="4"] .formula-box { background: var(--rose-dim);   color: var(--rose);   border: 1px solid rgba(244,63,94,.18); }
.exp-card[data-idx="5"] .formula-box { background: var(--teal-dim);   color: var(--teal);   border: 1px solid rgba(0,201,167,.18); }

/* ══════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════ */
.site-footer {
  position: relative; z-index: 1;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-align: center;
  padding: 22px;
  text-transform: uppercase;
}

/* ══════════════════════════════════════════════════════
   SCROLLBAR + RESPONSIVE
══════════════════════════════════════════════════════ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border2); }

@media (max-width: 480px) {
  .hero { padding: 52px 5vw 48px; }
  .card { padding: 20px; }
}