* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #0a5578;
  color: #163d4a;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
}

a {
  color: #075f92;
}

a:hover {
  color: #d46b20;
}

.page-shell {
  width: 100%;
  min-width: 760px;
  overflow: hidden;
}

.top-strip {
  height: 25px;
  background: #0c4b69;
  color: #cdeeff;
  border-bottom: 1px solid #06354d;
  font-size: 11px;
}

.top-inner {
  width: 920px;
  max-width: calc(100% - 30px);
  margin: auto;
  line-height: 25px;
  text-align: right;
}

.top-strip a {
  color: #dff7ff;
  text-decoration: none;
}

.top-strip a:hover {
  text-decoration: underline;
}

.sky {
  position: relative;
  min-height: 100vh;
  background:
    linear-gradient(#67ccef 0%, #a9e8fa 45%, #d7f6fa 61%, #70d4df 61.5%, #28a7b7 100%);
}

.sun {
  position: absolute;
  width: 145px;
  height: 145px;
  top: 34px;
  right: 8%;
  border-radius: 50%;
  background: #fff5a7;
  box-shadow: 0 0 25px rgba(255, 255, 220, .75);
  opacity: .88;
}

.cloud {
  position: absolute;
  height: 27px;
  width: 110px;
  border-radius: 30px;
  background: rgba(255,255,255,.78);
  box-shadow: 25px -14px 0 rgba(255,255,255,.78),
              58px -7px 0 rgba(255,255,255,.78);
}

.cloud-one { top: 60px; left: 9%; transform: scale(.8); }
.cloud-two { top: 145px; left: 50%; transform: scale(.55); opacity: .7; }
.cloud-three { top: 95px; right: 22%; transform: scale(.65); opacity: .62; }

.masthead,
.nav-bar,
main,
footer {
  position: relative;
  z-index: 2;
  width: 920px;
  max-width: calc(100% - 30px);
  margin-left: auto;
  margin-right: auto;
}

.masthead {
  min-height: 142px;
  padding: 30px 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 17px;
}

.turtle-logo {
  width: 92px;
  height: 92px;
  display: block;
  filter: drop-shadow(2px 4px 1px rgba(0,70,100,.22));
}

.wordmark {
  color: #0d5578;
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 44px;
  line-height: 42px;
  font-weight: bold;
  letter-spacing: -2px;
  text-shadow: 1px 2px 0 #e7ffff;
}

.tagline {
  margin-top: 6px;
  color: #256b7e;
  font-size: 13px;
  font-weight: bold;
}

.mini-badge {
  padding: 6px 10px;
  border: 1px solid #7db6c4;
  background: rgba(238, 255, 255, .65);
  color: #27657b;
  font-size: 10px;
  font-weight: bold;
  letter-spacing: 1px;
  box-shadow: inset 1px 1px 0 #fff;
}

.nav-bar {
  height: 34px;
  display: flex;
  border: 1px solid #0b6d83;
  background: linear-gradient(#f8ffff, #c7edf1);
  box-shadow: 1px 2px 3px rgba(0,65,90,.35);
}

.nav-bar a {
  display: block;
  padding: 8px 18px;
  border-right: 1px solid #91cbd3;
  color: #16576e;
  text-decoration: none;
  font-weight: bold;
  font-size: 12px;
}

.nav-bar a:hover {
  color: #fff;
  background: #1a92aa;
}

.hero {
  margin-top: 14px;
  min-height: 350px;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 14px;
  padding: 18px;
  border: 1px solid #2a8ea2;
  background: rgba(245, 255, 255, .76);
  box-shadow: 2px 3px 5px rgba(0,70,90,.3), inset 1px 1px 0 #fff;
}

.hero-copy {
  padding: 18px 18px 18px 12px;
}

.small-title {
  color: #167c91;
  font-size: 10px;
  font-weight: bold;
  letter-spacing: 2px;
}

h1 {
  margin: 10px 0 12px;
  color: #0b5876;
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 37px;
  line-height: 37px;
}

h1 span {
  color: #168da0;
}

.hero-copy p {
  max-width: 480px;
  font-size: 14px;
  line-height: 21px;
}

.button-row {
  margin-top: 22px;
  display: flex;
  align-items: center;
  gap: 13px;
}

.big-button,
.plain-button,
.download-button {
  display: inline-block;
  text-decoration: none;
  font-weight: bold;
}

.big-button {
  padding: 9px 14px;
  color: #fff;
  border: 1px solid #0a5d73;
  background: linear-gradient(#36b9cb, #087f98);
  box-shadow: inset 1px 1px 0 rgba(255,255,255,.65), 2px 2px 2px rgba(0,70,90,.25);
}

.big-button:hover {
  color: #fff;
  background: linear-gradient(#49c6d5, #0b8aa3);
}

.button-icon {
  display: inline-block;
  margin-right: 7px;
  padding-right: 7px;
  border-right: 1px solid rgba(255,255,255,.5);
  font-size: 9px;
}

.plain-button {
  color: #19617b;
}

.notice-box {
  margin-top: 23px;
  padding: 9px 11px;
  border: 1px solid #9acbd2;
  background: rgba(218, 248, 250, .8);
  font-size: 11px;
}

.notice-box strong {
  display: block;
  color: #08738b;
  margin-bottom: 3px;
}

.hero-art {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.water-oval {
  position: relative;
  width: 310px;
  height: 235px;
  border-radius: 48% 52% 50% 50%;
  background: linear-gradient(#a8f1fb 0%, #53cbd8 45%, #168ea6 100%);
  border: 4px solid rgba(255,255,255,.75);
  box-shadow: inset 0 0 0 1px #4aa6b5, 4px 5px 0 rgba(0,70,90,.15);
  overflow: hidden;
}

.water-oval:before,
.water-oval:after {
  content: "";
  position: absolute;
  left: -30px;
  width: 370px;
  height: 35px;
  border-top: 3px solid rgba(255,255,255,.55);
  border-radius: 50%;
  transform: rotate(-4deg);
}

.water-oval:before { top: 50px; }
.water-oval:after { top: 135px; opacity: .6; }

.hero-turtle {
  position: absolute;
  width: 235px;
  height: 190px;
  left: 38px;
  top: 25px;
  z-index: 2;
}

.bubble {
  position: absolute;
  border: 2px solid rgba(255,255,255,.7);
  border-radius: 50%;
  z-index: 3;
}

.bubble-a { width: 14px; height: 14px; left: 35px; bottom: 45px; }
.bubble-b { width: 8px; height: 8px; right: 55px; top: 48px; }
.bubble-c { width: 20px; height: 20px; right: 30px; top: 75px; opacity: .65; }

.art-caption {
  margin-top: 7px;
  color: #31778a;
  font-size: 9px;
  font-weight: bold;
  letter-spacing: 1px;
}

.content-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.panel {
  border: 1px solid #3c9aab;
  background: #f2fcfc;
  box-shadow: 2px 3px 4px rgba(0,70,90,.22), inset 1px 1px 0 #fff;
}

.panel.wide {
  grid-column: 1 / 3;
}

.panel-title {
  padding: 7px 10px;
  color: #fff;
  background: linear-gradient(#55b8c5, #238fa3);
  border-bottom: 1px solid #147286;
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 1px;
}

.panel-body {
  padding: 12px 14px 15px;
  line-height: 18px;
}

.text-link {
  font-weight: bold;
  font-size: 11px;
}

.feature-list div {
  padding: 5px 0;
  border-bottom: 1px dotted #a6cdd2;
}

.feature-list div:last-child {
  border-bottom: 0;
}

.feature-list span {
  display: inline-block;
  width: 27px;
  color: #1b8ca2;
  font-size: 10px;
  font-weight: bold;
}

.about-row {
  display: flex;
  align-items: center;
  gap: 20px;
}

.about-turtle {
  width: 115px;
  height: 115px;
}

.small-note {
  color: #66858c;
  font-size: 11px;
}

.download-panel {
  margin-top: 14px;
  padding: 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid #176d83;
  background: linear-gradient(90deg, #dffbfb, #b9eef2);
  box-shadow: 2px 3px 5px rgba(0,70,90,.25), inset 1px 1px 0 #fff;
}

.download-panel h2 {
  margin: 4px 0 5px;
  color: #0b5b74;
  font-family: "Trebuchet MS", Arial, sans-serif;
  font-size: 26px;
}

.download-panel p {
  margin: 0;
  max-width: 570px;
}

.download-button {
  padding: 12px 18px;
  color: #fff;
  background: linear-gradient(#f1a64c, #cf6c1f);
  border: 1px solid #a75216;
  box-shadow: inset 1px 1px 0 rgba(255,255,255,.6), 2px 2px 2px rgba(100,50,0,.2);
}

.download-button:hover {
  color: #fff;
  background: linear-gradient(#f8b35c, #dc7925);
}

.download-note {
  margin-top: 6px;
  text-align: center;
  color: #55777e;
  font-size: 9px;
}

.help-panel {
  margin-top: 14px;
  border: 1px solid #3c9aab;
  background: #f5ffff;
  box-shadow: 2px 3px 4px rgba(0,70,90,.22);
}

.help-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 12px;
  gap: 18px;
}

.help-columns > div {
  padding: 5px 10px;
  border-right: 1px dotted #9bc9ce;
}

.help-columns > div:last-child {
  border-right: 0;
}

.help-columns strong {
  color: #17798d;
}

.help-columns p {
  margin-bottom: 0;
  line-height: 17px;
}

footer {
  padding: 24px 10px 35px;
  color: #e0f8fb;
  font-size: 11px;
}

.footer-line {
  height: 2px;
  border-top: 1px solid rgba(255,255,255,.7);
  border-bottom: 1px solid rgba(0,75,95,.3);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  padding-top: 12px;
}

.footer-links a {
  display: block;
  color: #e6fbff;
  text-decoration: none;
  margin-bottom: 3px;
}

.footer-links a:hover {
  color: #fff3a8;
  text-decoration: underline;
}

.copyright {
  text-align: right;
}

.footer-bottom {
  margin-top: 16px;
  padding-top: 8px;
  border-top: 1px dotted rgba(255,255,255,.35);
  display: flex;
  justify-content: space-between;
  color: #b7e4eb;
  font-size: 10px;
}

code {
  font-family: "Courier New", monospace;
}

@media (max-width: 800px) {
  .page-shell {
    min-width: 0;
  }

  .masthead,
  .nav-bar,
  main,
  footer {
    max-width: calc(100% - 16px);
  }

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

  .hero-art {
    min-height: 280px;
  }

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

  .panel.wide {
    grid-column: auto;
  }

  .download-panel {
    display: block;
  }

  .download-right {
    margin-top: 15px;
  }

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

  .help-columns > div {
    border-right: 0;
    border-bottom: 1px dotted #9bc9ce;
    padding-bottom: 10px;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .copyright {
    text-align: left;
  }

  .footer-bottom {
    display: block;
  }

  .footer-bottom span {
    display: block;
    margin-bottom: 4px;
  }
}