:root {
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Arial,
    sans-serif;
  color: #092341;
  background: #fff;
  font-synthesis: none;
  --teal: #008596;
  --muted: #636d80;
  --line: #d7e2eb;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
a {
  color: inherit;
}
a:focus-visible {
  outline: 3px solid #0098a8;
  outline-offset: 5px;
}
.skip {
  position: absolute;
  left: 12px;
  top: -80px;
  background: white;
  padding: 12px;
  z-index: 10;
}
.skip:focus {
  top: 12px;
}
header {
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1450px;
  padding: 14px 0;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  display: flex;
  align-items: center;
  gap: 18px;
  text-decoration: none;
  font-size: 26px;
  font-weight: 750;
  letter-spacing: -0.7px;
}
.brand svg {
  width: 47px;
  height: 38px;
  stroke: var(--teal);
  stroke-width: 3.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.brand-light {
  color: #536178;
  font-weight: 450;
}
.personal {
  display: flex;
  gap: 16px;
  align-items: center;
  text-decoration: none;
  font-weight: 650;
  color: #175389;
  font-size: 17px;
}
.personal svg {
  width: 23px;
  height: 23px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}
main,
footer {
  max-width: 1450px;
  margin: auto;
}
.intro {
  text-align: center;
  padding: 51px 20px 39px;
}
.intro h1 {
  font-size: 58px;
  line-height: 1.13;
  letter-spacing: -2px;
  margin: 0 0 13px;
  font-weight: 700;
}
.intro p {
  font-size: 26px;
  line-height: 1.4;
  color: var(--muted);
  margin: 0;
}
.tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
}
.tool {
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 29px 38px 37px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.signal {
  height: 150px;
  width: 370px;
  max-width: 100%;
  margin-bottom: 18px;
  overflow: visible;
}
.signal .axes {
  stroke: #233f60;
  fill: none;
  stroke-width: 1.2;
}
.signal text {
  fill: #233f60;
  font-size: 15px;
}
.trace {
  stroke: var(--teal);
  stroke-width: 2.4;
  fill: none;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.dots {
  fill: var(--teal);
}
.tool h2 {
  font-size: 38px;
  line-height: 1.2;
  letter-spacing: -1.1px;
  margin: 0 0 2px;
}
.discipline {
  font-size: 25px;
  line-height: 1.3;
  font-weight: 650;
  color: var(--teal);
  margin: 0 0 12px;
}
.description {
  font-size: 21px;
  line-height: 1.5;
  color: var(--muted);
  margin: 0 0 24px;
}
.button {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 27px;
  background: #103354;
  color: white;
  border-radius: 9px;
  padding: 17px 29px;
  text-decoration: none;
  font-size: 20px;
  font-weight: 550;
  box-shadow: 0 2px 5px #12314c15;
  transition: background 0.15s;
}
.button:hover {
  background: #175279;
}
.button svg {
  width: 23px;
  height: 23px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}
.before {
  margin-top: 34px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.before > h2 {
  font-size: 29px;
  letter-spacing: -0.7px;
  margin: 0 0 21px;
}
.tips {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
}
.tips article {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  padding: 9px 31px 3px 0;
}
.tips article + article {
  border-left: 1px solid var(--line);
  padding-left: 40px;
}
.tips svg {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  fill: none;
  stroke: var(--teal);
  stroke-width: 2.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.tips h3 {
  font-size: 19px;
  line-height: 1.4;
  margin: 0 0 11px;
  font-weight: 700;
}
.tips p {
  font-size: 17px;
  line-height: 1.55;
  color: #737e90;
  margin: 0;
}
footer {
  margin-top: 25px;
  border-top: 1px solid var(--line);
  padding: 16px 0;
  display: flex;
  justify-content: space-between;
  color: #788396;
  font-size: 15px;
}
@media (max-width: 1550px) {
  .header-inner,
  main,
  footer {
    margin-left: 4.4%;
    margin-right: 4.4%;
  }
}
@media (max-width: 1000px) {
  .intro h1 {
    font-size: 46px;
  }
  .intro p {
    font-size: 21px;
  }
  .tool {
    padding: 25px;
  }
  .description {
    font-size: 18px;
  }
  .tips article {
    gap: 15px;
    padding-right: 20px;
  }
  .tips article + article {
    padding-left: 20px;
  }
  .tips h3 {
    font-size: 17px;
  }
  .tips p {
    font-size: 15px;
  }
  .tips svg {
    width: 30px;
    height: 30px;
  }
}
@media (max-width: 700px) {
  .header-inner {
    padding: 15px 0;
  }
  .brand {
    font-size: 21px;
    gap: 10px;
  }
  .brand svg {
    width: 32px;
    height: 30px;
  }
  .personal {
    font-size: 13px;
    gap: 7px;
  }
  .personal svg {
    width: 17px;
  }
  .intro {
    padding: 38px 0 28px;
  }
  .intro h1 {
    font-size: 39px;
    letter-spacing: -1.4px;
  }
  .intro p {
    font-size: 19px;
  }
  .tools {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .tool {
    padding: 24px;
  }
  .signal {
    height: 135px;
    margin-bottom: 12px;
  }
  .tool h2 {
    font-size: 32px;
  }
  .discipline {
    font-size: 22px;
  }
  .button {
    font-size: 18px;
    padding: 15px 24px;
  }
  .before {
    margin-top: 28px;
  }
  .before > h2 {
    font-size: 25px;
  }
  .tips {
    grid-template-columns: 1fr;
  }
  .tips article,
  .tips article + article {
    border: 0;
    padding: 10px 0 18px;
    gap: 20px;
  }
  .tips h3 {
    margin-bottom: 6px;
  }
  .tips p {
    font-size: 16px;
  }
  footer {
    font-size: 13px;
    gap: 20px;
    line-height: 1.5;
  }
}