.ch-premium-chart {
    min-height: 500px;
    padding: 30px;
  }

  .ch-premium-chart-frame {
    position: relative;
    min-height: 475px;
    padding: 34px 26px 156px 54px;
    border-radius: 0;
    background:
      linear-gradient(rgba(21, 22, 18, .045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(21, 22, 18, .045) 1px, transparent 1px),
      var(--ch-premium-paper);
    background-size: 100% 20%, 20% 100%, auto;
    box-shadow: none;
  }

  .ch-premium-chart-frame::before,
  .ch-premium-chart-frame::after {
    content: "";
    position: absolute;
    background: rgba(21, 22, 18, .16);
  }

  .ch-premium-chart-frame::before {
    top: 58px;
    bottom: 156px;
    left: 54px;
    width: 1px;
  }

  .ch-premium-chart-frame::after {
    right: 26px;
    bottom: 156px;
    left: 54px;
    height: 1px;
  }

  .ch-premium-chart-kicker {
    position: absolute;
    top: 26px;
    left: 54px;
    color: var(--ch-premium-ink);
    font-family: var(--ch-premium-font-mono);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: .09em;
    text-transform: uppercase;
  }

  .ch-premium-chart-y-axis {
    position: absolute;
    top: 62px;
    bottom: 168px;
    left: 18px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: var(--ch-premium-muted);
    font-family: var(--ch-premium-font-mono);
    font-size: 9px;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }

  .ch-premium-chart-svg {
    position: absolute;
    inset: 62px 26px 156px 54px;
    width: calc(100% - 80px);
    height: calc(100% - 246px);
    overflow: visible;
  }

  .ch-premium-chart-axis {
    position: absolute;
    right: 26px;
    bottom: 126px;
    left: 54px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    color: var(--ch-premium-warm);
    font-family: var(--ch-premium-font-mono);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
  }

  .ch-premium-chart-axis span {
    position: relative;
  }

  .ch-premium-chart-axis span::before {
    content: "";
    position: absolute;
    top: -198px;
    left: 0;
    width: 1px;
    height: 188px;
    background: rgba(21, 22, 18, .055);
  }

  .ch-premium-chart-legend {
    position: absolute;
    right: 26px;
    bottom: 100px;
    left: 54px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }

  .ch-premium-chart-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ch-premium-warm);
  }

  .ch-premium-chart-label::before {
    content: "";
    width: 26px;
    height: 3px;
    border-radius: 999px;
    background: var(--ch-premium-ink);
  }

  .ch-premium-chart-label.is-signal::before {
    background: var(--ch-premium-green-deep);
  }

  .ch-premium-chart-svg path {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .ch-premium-chart-svg .cost-gap {
    fill: rgba(140, 255, 134, .1);
    stroke: rgba(66, 215, 100, .18);
    stroke-width: 1;
    stroke-dasharray: 5 6;
  }

  .ch-premium-chart-svg .day-one-glow {
    stroke: rgba(21, 22, 18, .28);
    stroke-width: 8;
    opacity: .22;
  }

  .ch-premium-chart-svg .baseline {
    stroke: rgba(21, 22, 18, .46);
    stroke-width: 4;
  }

  .ch-premium-chart-svg .signal {
    stroke: var(--ch-premium-green-deep);
    stroke-width: 5;
    filter: drop-shadow(0 7px 8px rgba(66, 215, 100, .16));
  }

  .ch-premium-chart-note {
    position: absolute;
    z-index: 3;
    display: inline-flex;
    width: fit-content;
    max-width: 170px;
    padding: 7px 10px;
    border: 1px dashed rgba(66, 215, 100, .42);
    border-radius: 999px;
    background: rgba(250, 250, 246, .86);
    box-shadow: none;
  }

  .ch-premium-chart-note span {
    color: var(--ch-premium-muted);
    font-family: var(--ch-premium-font-mono);
    font-size: 9px;
    font-weight: 800;
    letter-spacing: .08em;
    line-height: 1;
    text-transform: uppercase;
  }

  .ch-premium-chart-note.is-gap {
    top: 126px;
    right: 36px;
  }

  .ch-premium-chart-note.is-gap span {
    color: var(--ch-premium-green-deep);
  }

  .ch-premium-chart-story {
    position: absolute;
    right: 26px;
    bottom: 18px;
    left: 54px;
    display: grid;
    grid-template-columns: 1fr 1.25fr;
    gap: 28px;
    padding-top: 20px;
    border-top: 1px solid rgba(21, 22, 18, .13);
    color: var(--ch-premium-muted);
    font-family: var(--ch-premium-font-secondary);
    font-size: 14px;
    line-height: 1.28;
  }

  .ch-premium-chart-story strong {
    color: var(--ch-premium-ink);
    font-weight: 400;
  }

  .ch-premium-chart.is-visible .ch-premium-chart-svg .baseline,
  .ch-premium-chart.is-visible .ch-premium-chart-svg .signal {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    animation: ch-premium-line-draw 1100ms var(--ch-premium-ease) forwards;
  }

  .ch-premium-chart.is-visible .ch-premium-chart-svg .signal {
    animation-delay: 260ms;
  }

  .ch-premium-chart.is-visible .ch-premium-chart-svg .cost-gap {
    opacity: 0;
    animation: ch-premium-gap-in 480ms var(--ch-premium-ease) 980ms forwards;
  }

  .ch-premium-chart.is-visible .ch-premium-chart-note {
    opacity: 0;
    transform: translateY(8px);
    animation: ch-premium-chart-note-in 360ms var(--ch-premium-ease) forwards;
  }

  .ch-premium-chart.is-visible .ch-premium-chart-note.is-gap { animation-delay: 1040ms; }

  .ch-premium-chart.is-visible .ch-premium-chart-story span {
    opacity: 0;
    transform: translateY(8px);
    animation: ch-premium-chart-note-in 360ms var(--ch-premium-ease) forwards;
  }

  .ch-premium-chart.is-visible .ch-premium-chart-story span:nth-child(1) { animation-delay: 280ms; }
  .ch-premium-chart.is-visible .ch-premium-chart-story span:nth-child(2) { animation-delay: 1160ms; }

  @keyframes ch-premium-line-draw {
    to { stroke-dashoffset: 0; }
  }

  @keyframes ch-premium-gap-in {
    to { opacity: 1; }
  }

  @keyframes ch-premium-chart-note-in {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .ch-premium-mechanism {
    background: var(--ch-premium-cream);
  }

  .ch-premium-mechanism-shell {
    display: grid;
    gap: clamp(34px, 5vw, 64px);
  }

  .ch-premium-mechanism-intro {
    max-width: 920px;
  }

  .ch-premium-mechanism-intro .ch-premium-body {
    max-width: 640px;
  }

  .ch-premium-flow {
    min-height: 536px;
    padding: 0;
  }