:root {
  --black: #0b0b0b;
  --ink: #151515;
  --muted: #6c6c68;
  --paper: #f5f3ed;
  --white: #fff;
  --red: #c9251f;
  --red-light: #ff625a;
  --line: rgba(21, 21, 21, 0.17);
  --shell: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  height: auto;
  max-width: 100%;
}

a {
  color: inherit;
}

.shell {
  margin: 0 auto;
  max-width: var(--shell);
  padding-left: 28px;
  padding-right: 28px;
}

.skip-link {
  background: var(--white);
  color: var(--black);
  left: 16px;
  padding: 12px 16px;
  position: fixed;
  top: -80px;
  z-index: 100;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  background: var(--black);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--white);
}

.nav-wrap {
  align-items: center;
  display: grid;
  gap: 24px;
  grid-template-columns: auto 1fr auto;
  min-height: 90px;
}

.wordmark {
  align-items: center;
  display: inline-flex;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
  line-height: 0.9;
  text-decoration: none;
}

.wordmark-die {
  fill: var(--white);
  height: 40px;
  margin-right: 12px;
  width: 40px;
}

.wordmark-die circle {
  fill: var(--black);
}

.site-header nav {
  display: flex;
  gap: clamp(18px, 2.5vw, 38px);
  justify-content: center;
}

.site-header nav a,
.site-footer nav a {
  color: #c7c7c2;
  font-size: 14px;
  text-decoration: none;
}

.site-header nav a:hover,
.site-header nav a:focus-visible,
.site-footer nav a:hover,
.site-footer nav a:focus-visible {
  color: var(--white);
}

.header-buy {
  border: 1px solid rgba(255, 255, 255, 0.55);
  font-size: 14px;
  font-weight: 700;
  padding: 12px 17px;
  text-decoration: none;
}

.header-buy:hover,
.header-buy:focus-visible {
  background: var(--white);
  color: var(--black);
}

.hero {
  background: var(--black);
  color: var(--white);
  overflow: hidden;
  padding: clamp(56px, 8vw, 112px) 0;
}

.hero-grid {
  align-items: center;
  display: grid;
  gap: clamp(48px, 7vw, 100px);
  grid-template-columns: minmax(0, 0.95fr) minmax(430px, 1.05fr);
}

.eyebrow {
  color: var(--red);
  font-family: "Courier New", monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  margin: 0 0 22px;
}

.hero .eyebrow,
.section-dark .eyebrow {
  color: var(--red-light);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  letter-spacing: -0.055em;
}

h1 {
  font-size: clamp(52px, 6.1vw, 88px);
  line-height: 0.92;
  margin-bottom: 30px;
}

h2 {
  font-size: clamp(38px, 4.7vw, 68px);
  line-height: 0.96;
}

h3 {
  font-size: 23px;
  letter-spacing: -0.025em;
}

p {
  line-height: 1.55;
}

.hero-lead {
  color: #c7c7c2;
  font-size: clamp(19px, 1.7vw, 24px);
  max-width: 650px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 34px 0 22px;
}

.button {
  align-items: center;
  display: inline-flex;
  font-size: 16px;
  font-weight: 800;
  justify-content: center;
  min-height: 54px;
  padding: 14px 22px;
  text-decoration: none;
}

.button-primary {
  background: var(--red);
  color: var(--white);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #a91c17;
}

.button-secondary {
  border: 1px solid #777;
  color: var(--white);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--white);
}

.hero-note {
  color: #8d8d88;
  font-size: 14px;
  margin: 0;
}

.hero-visual {
  background: var(--white);
  box-shadow: 22px 22px 0 var(--red);
  position: relative;
}

.hero-visual img {
  aspect-ratio: 1;
  object-fit: cover;
}

.image-label {
  background: var(--black);
  color: var(--white);
  font-family: "Courier New", monospace;
  font-size: 12px;
  left: 18px;
  letter-spacing: 0.15em;
  padding: 10px 12px;
  position: absolute;
  top: 18px;
  z-index: 1;
}

.numbers {
  background: var(--red);
  color: var(--white);
}

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.numbers-grid div {
  border-right: 1px solid rgba(255, 255, 255, 0.3);
  padding: 29px 24px;
}

.numbers-grid div:first-child {
  border-left: 1px solid rgba(255, 255, 255, 0.3);
}

.numbers-grid strong,
.numbers-grid span {
  display: block;
}

.numbers-grid strong {
  font-size: clamp(26px, 3vw, 42px);
  letter-spacing: -0.045em;
}

.numbers-grid span {
  font-size: 13px;
  margin-top: 4px;
}

.section {
  padding: clamp(76px, 10vw, 144px) 0;
}

.section-light {
  background: var(--paper);
}

.section-dark {
  background: var(--black);
  color: var(--white);
}

.section-intro {
  max-width: 830px;
}

.section-intro h2 {
  margin-bottom: 28px;
}

.section-intro > p:not(.eyebrow) {
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
}

.feature-grid {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(50px, 7vw, 88px);
}

.feature-grid article {
  min-height: 310px;
  padding: 36px;
}

.feature-grid article + article {
  border-left: 1px solid var(--line);
}

.feature-number {
  color: var(--red);
  display: block;
  font-family: "Courier New", monospace;
  font-size: 13px;
  margin-bottom: 66px;
}

.feature-grid p {
  color: var(--muted);
  margin-bottom: 0;
}

.how-grid {
  align-items: start;
  display: grid;
  gap: clamp(48px, 7vw, 100px);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.how-photo {
  position: sticky;
  top: 30px;
}

.how-photo img {
  width: 100%;
}

.how-copy h2 {
  margin-bottom: 48px;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.steps li {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  display: grid;
  gap: 18px;
  grid-template-columns: 36px 1fr;
  padding: 24px 0;
}

.steps li > span {
  align-items: center;
  border: 1px solid #777;
  border-radius: 50%;
  display: flex;
  font-family: "Courier New", monospace;
  height: 32px;
  justify-content: center;
  width: 32px;
}

.steps h3 {
  margin: 3px 0 7px;
}

.steps p {
  color: #a8a8a3;
  margin-bottom: 0;
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  margin-top: 34px;
}

.inline-links a {
  color: var(--red-light);
  font-weight: 700;
  text-underline-offset: 4px;
}

.text-link {
  color: var(--red);
  font-weight: 700;
  text-underline-offset: 4px;
}

.security-callout {
  background: var(--red);
  color: var(--white);
  padding: 38px 0;
}

.security-callout-grid {
  align-items: start;
  display: grid;
  gap: 40px;
  grid-template-columns: minmax(200px, 0.35fr) minmax(0, 1fr);
}

.security-callout .eyebrow {
  color: var(--white);
  margin-bottom: 0;
}

.security-callout p:last-child {
  font-size: clamp(18px, 2vw, 24px);
  margin-bottom: 0;
}

.math-grid {
  align-items: start;
  display: grid;
  gap: clamp(50px, 8vw, 112px);
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
}

.math-intro > p:not(.eyebrow) {
  font-size: 19px;
}

.math-card {
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 14px 14px 0 #dedbd2;
  padding: clamp(25px, 4vw, 48px);
}

.formula {
  background: var(--black);
  color: var(--white);
  font-family: "Courier New", monospace;
  font-size: clamp(18px, 2vw, 25px);
  margin-bottom: 34px;
  padding: 22px;
  text-align: center;
}

table {
  border-collapse: collapse;
  width: 100%;
}

caption {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
  text-align: left;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 16px 9px;
  text-align: left;
}

th {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.highlight td {
  color: var(--red);
  font-weight: 800;
}

.fine-print {
  color: var(--muted);
  font-size: 13px;
  margin: 26px 0 0;
}

.faq-section {
  background: var(--white);
}

.faq-grid {
  display: grid;
  gap: clamp(48px, 8vw, 120px);
  grid-template-columns: minmax(250px, 0.55fr) minmax(0, 1fr);
}

.faq-grid h2 {
  margin-bottom: 0;
}

.faq-list article {
  border-top: 1px solid var(--line);
}

.faq-list article:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-list h3 {
  font-size: 20px;
  font-weight: 800;
  margin: 0;
  padding: 25px 24px 25px 0;
}

.faq-list article p {
  color: var(--muted);
  margin: -5px 0 26px;
  max-width: 760px;
}

.final-cta {
  background: var(--red);
  color: var(--white);
  padding: clamp(64px, 8vw, 110px) 0;
}

.final-cta-grid {
  align-items: end;
  display: flex;
  gap: 40px;
  justify-content: space-between;
}

.final-cta .eyebrow {
  color: var(--white);
}

.final-cta h2 {
  margin-bottom: 0;
}

.button-light {
  background: var(--white);
  color: var(--black);
  flex: 0 0 auto;
}

.button-light:hover,
.button-light:focus-visible {
  background: var(--black);
  color: var(--white);
}

.site-footer {
  background: var(--black);
  color: var(--white);
  padding: 52px 0;
}

.footer-grid {
  align-items: center;
  display: grid;
  gap: 30px;
  grid-template-columns: auto 1fr auto;
}

.footer-grid p {
  font-size: 14px;
  margin-bottom: 0;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  justify-content: center;
}

.copyright {
  color: #898984;
}

@media (max-width: 980px) {
  .site-header nav {
    display: none;
  }

  .nav-wrap {
    grid-template-columns: 1fr auto;
  }

  .hero-grid,
  .how-grid,
  .math-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    margin-right: 20px;
    max-width: 680px;
  }

  .numbers-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .numbers-grid div:first-child,
  .numbers-grid div:nth-child(3) {
    border-left: 1px solid rgba(255, 255, 255, 0.3);
  }

  .numbers-grid div:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  }

  .how-photo {
    max-width: 760px;
    position: static;
  }

  .math-card {
    max-width: 760px;
  }

  .faq-grid {
    gap: 30px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 720px) {
  .shell {
    padding-left: 20px;
    padding-right: 20px;
  }

  .nav-wrap {
    min-height: 78px;
  }

  .wordmark {
    font-size: 13px;
  }

  .wordmark-die {
    height: 34px;
    width: 34px;
  }

  .header-buy {
    padding: 10px 12px;
  }

  .hero {
    padding-top: 50px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-visual {
    box-shadow: 12px 12px 0 var(--red);
    margin-right: 12px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid article {
    min-height: 0;
    padding: 30px 0;
  }

  .feature-grid article + article {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .feature-number {
    margin-bottom: 32px;
  }

  .security-callout-grid {
    gap: 16px;
    grid-template-columns: 1fr;
  }

  .final-cta-grid {
    align-items: stretch;
    flex-direction: column;
  }

  .button-light {
    width: 100%;
  }
}

@media (max-width: 460px) {
  .numbers-grid {
    grid-template-columns: 1fr;
  }

  .numbers-grid div,
  .numbers-grid div:first-child,
  .numbers-grid div:nth-child(3) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    border-left: 1px solid rgba(255, 255, 255, 0.3);
  }

  .math-card {
    padding: 20px;
  }

  th,
  td {
    font-size: 13px;
    padding: 13px 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}