:root {
  color-scheme: light;
  --blue: #0d6efd;
  --ink: #212529;
  --muted: #657180;
  --line: #dee2e6;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}
body {
  margin: 0;
  background: #f8f9fa;
  color: var(--ink);
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    'Microsoft YaHei',
    sans-serif;
  font-size: 15px;
  line-height: 1.65;
}
a {
  color: var(--blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
a:focus-visible,
button:focus-visible {
  outline: 3px solid #78b1ff;
  outline-offset: 4px;
}
.wrap {
  max-width: 1180px;
  margin: auto;
  padding: 0 28px;
}
header {
  background: #212529;
  color: white;
}
.nav {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  font-size: 21px;
  color: #fff;
  white-space: nowrap;
  letter-spacing: -0.5px;
}
.brand span {
  font-size: 16px;
  color: #a9caff;
  border-left: 1px solid #59616b;
  margin-left: 12px;
  padding-left: 14px;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}
.back {
  font-size: 13px;
  color: #d5d9de;
}
#language {
  font: inherit;
  font-size: 13px;
  border: 1px solid #cdd2d7;
  color: #fff;
  background: transparent;
  border-radius: 5px;
  padding: 5px 13px;
  cursor: pointer;
}
#language:hover {
  background: white;
  color: var(--ink);
}
.hero {
  display: grid;
  grid-template-columns: 1.08fr 1fr;
  gap: 65px;
  align-items: center;
  padding: 78px 0 68px;
}
.eyebrow {
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 1.4px;
  color: #566b83;
  display: flex;
  align-items: center;
  gap: 9px;
}
.dot {
  width: 7px;
  height: 7px;
  background: var(--blue);
  border-radius: 50%;
}
h1 {
  font-size: 46px;
  line-height: 1.28;
  letter-spacing: -1.7px;
  margin: 24px 0;
  white-space: pre-line;
}
p {
  margin: 0;
}
.lead {
  font-size: 16px;
  color: var(--muted);
  max-width: 480px;
  line-height: 1.9;
}
.actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--blue);
  border-radius: 5px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 550;
  text-align: center;
}
.button:hover {
  text-decoration: none;
  filter: brightness(0.94);
}
.primary {
  background: var(--blue);
  color: #fff;
}
.secondary {
  background: #fff;
  color: var(--blue);
}
.platforms {
  font-size: 12px;
  color: var(--muted);
  margin-top: 16px;
}
.preview {
  background: #fff;
  border: 1px solid #d5dce5;
  border-radius: 10px;
  box-shadow: 0 18px 44px #2038540c;
  overflow: hidden;
  transform: rotate(-1deg);
}
.preview-top {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #f0f3f7;
  border-bottom: 1px solid #e3e8ee;
  padding: 13px 16px;
  font-size: 11px;
  color: #657180;
}
.window-dots {
  color: #b9c2ce;
  letter-spacing: 2px;
  font-size: 9px;
}
.live {
  margin-left: auto;
  font-size: 9px;
  color: #15754a;
  background: #e3f2e9;
  border-radius: 4px;
  padding: 2px 7px;
}
.slide {
  margin: 23px 23px 0;
  padding: 26px;
  background: #f2f6fd;
  border: 1px solid #dce6f6;
  border-radius: 5px;
  position: relative;
}
.slide-label {
  font-size: 9px;
  letter-spacing: 1.3px;
  color: #53739a;
}
.slide-question {
  font-size: 24px;
  font-weight: 650;
  line-height: 1.5;
  margin: 14px 0 22px;
  white-space: pre-line;
}
.answers {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}
.answers > span {
  background: white;
  border: 1px solid #dce3ed;
  border-radius: 4px;
  flex: 1;
  padding: 7px 11px;
  font-size: 12px;
  color: #677789;
}
.answers .selected {
  background: #e6efff;
  border-color: #83b3ff;
  color: var(--blue);
}
.selected b {
  float: right;
}
.capture {
  background: #252e3b;
  color: white;
  padding: 10px 14px;
  border-radius: 6px;
  display: flex;
  gap: 9px;
  font-size: 11px;
  box-shadow: 0 5px 14px #17274020;
  margin-bottom: -43px;
  position: relative;
}
.capture-time {
  margin-left: auto;
  color: #accdff;
}
.results {
  padding: 43px 26px 16px;
  display: flex;
  align-items: center;
  gap: 25px;
}
.small-label {
  font-size: 10px;
  color: var(--muted);
  display: block;
}
.results strong {
  font-size: 35px;
  line-height: 1.3;
  letter-spacing: -1px;
}
.results strong span {
  font-size: 18px;
  color: #8694a7;
}
.bars {
  display: flex;
  gap: 8px;
  height: 54px;
  align-items: end;
  flex: 1;
  border-bottom: 1px solid #e5eaf1;
}
.bars i {
  width: 25%;
  height: var(--height);
  background: #dce5f1;
  border-radius: 3px 3px 0 0;
}
.bars .correct {
  background: var(--blue);
}
.result-note {
  font-size: 11px;
  color: var(--muted);
  white-space: pre-line;
}
.preview-bottom {
  display: flex;
  justify-content: space-between;
  padding: 10px 17px;
  border-top: 1px solid #edf0f4;
  color: #7b8797;
  font-size: 9px;
}
.workflow {
  border-top: 1px solid var(--line);
  padding: 36px 0 46px;
}
.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 26px;
}
h2 {
  font-size: 25px;
  letter-spacing: -0.5px;
  margin: 6px 0 0;
}
.section-heading > p {
  font-size: 13px;
  color: var(--muted);
  padding-bottom: 4px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.step {
  font-size: 12px;
  color: var(--blue);
  font-weight: 650;
  border-bottom: 2px solid #c8ddff;
  display: inline-block;
  padding-bottom: 5px;
  margin-bottom: 10px;
}
h3 {
  font-size: 16px;
  margin: 0 0 10px;
}
.steps p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}
.downloads {
  padding: 34px 0 56px;
  border-top: 1px solid var(--line);
}
.version,
.student-tag {
  font-size: 11px;
  background: #e9eff7;
  color: #48617f;
  border-radius: 4px;
  padding: 4px 9px;
}
.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}
.download-card {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  padding: 26px;
  display: flex;
  align-items: start;
  flex-direction: column;
}
.device {
  font-size: 37px;
  line-height: 1;
  color: var(--blue);
  margin-bottom: 20px;
}
.mac {
  font-size: 35px;
}
.download-card h3 {
  font-size: 20px;
  margin-bottom: 6px;
}
.download-card p {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 24px;
}
.download-card .button {
  width: 100%;
  margin-bottom: 10px;
}
.file-note {
  font-size: 11px;
  color: var(--muted);
  margin-top: 5px;
}
.student-card {
  align-items: center;
  text-align: center;
  background: #f1f5fb;
}
.student-tag {
  margin-bottom: 12px;
}
.student-card img {
  width: 160px;
  height: 160px;
  object-fit: contain;
  background: white;
  border-radius: 6px;
}
.student-card p {
  margin-bottom: 12px;
}
.footer-main {
  border-top: 1px solid var(--line);
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 12px;
  color: var(--muted);
}
footer b {
  font-weight: 500;
  color: var(--blue);
}
footer a {
  font-size: 12px;
}
.skip {
  position: absolute;
  left: 15px;
  top: -100px;
  background: white;
  padding: 8px;
  z-index: 2;
}
.skip:focus {
  top: 10px;
}
@media (min-width: 1400px) {
  .hero {
    padding-top: 92px;
    padding-bottom: 82px;
  }
}
@media (max-width: 950px) {
  .hero {
    gap: 30px;
  }
  h1 {
    font-size: 36px;
  }
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .download-card {
    padding: 20px;
  }
  .preview-top {
    gap: 6px;
  }
  .section-heading > p {
    max-width: 220px;
  }
}
@media (max-width: 720px) {
  .wrap {
    padding-left: 20px;
    padding-right: 20px;
  }
  .nav {
    min-height: 62px;
    gap: 10px;
  }
  .brand {
    font-size: 18px;
  }
  .brand span {
    font-size: 14px;
    margin-left: 6px;
    padding-left: 8px;
  }
  .back {
    display: none;
  }
  .hero {
    grid-template-columns: 1fr;
    padding: 44px 0;
    gap: 38px;
  }
  h1 {
    font-size: 38px;
  }
  .lead {
    max-width: none;
  }
  .preview {
    transform: none;
    max-width: 490px;
    width: 100%;
    justify-self: center;
  }
  .section-heading {
    align-items: start;
    flex-direction: column;
    gap: 10px;
  }
  .section-heading > p {
    max-width: none;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .download-card {
    padding: 25px;
  }
  .student-card img {
    width: 180px;
    height: 180px;
  }
  .steps {
    gap: 26px 20px;
  }
  .actions {
    flex-wrap: wrap;
  }
  .footer-main {
    padding-top: 22px !important;
    padding-bottom: 22px !important;
    flex-wrap: wrap;
    gap: 10px;
  }
  .footer-main > span:nth-child(2) {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
.login-guide {
  padding: 34px 0 56px;
  border-top: 1px solid var(--line);
}
.login-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.login-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: white;
}
.login-card h3 {
  font-size: 18px;
  margin: 18px 0;
}
.login-card ol {
  padding-left: 22px;
  font-size: 14px;
  color: var(--muted);
}
.login-card li {
  padding-left: 5px;
  margin: 12px 0;
}
.token-notice,
.login-note {
  font-size: 13px;
  padding: 12px 15px;
  border-radius: 5px;
  background: #edf4ff;
  color: #325782;
}
.token-notice {
  background: #fff6df;
  color: #78571c;
}
@media (max-width: 720px) {
  .login-grid {
    grid-template-columns: 1fr;
  }
  .login-card {
    padding: 22px;
  }
}

.mac-help {
  margin: 0 0 44px;
  padding: 26px;
  border: 1px solid #ead9ab;
  border-radius: 7px;
  background: #fffbf1;
}
.mac-help h2 {
  font-size: 22px;
  margin: 14px 0;
}
.mac-help p,
.mac-help li {
  font-size: 14px;
  color: #655c49;
}
.mac-help ol {
  padding-left: 22px;
}
.mac-help li {
  padding-left: 5px;
  margin: 10px 0;
}
.mac-help .mac-help-note {
  font-size: 12px;
  margin-bottom: 10px;
}
.mac-help > a,
.mac-help-link {
  font-size: 12px;
}
.mac-help-link {
  margin-top: 12px;
}
.filing {
  background: #212529;
  color: #dee2e6;
  padding: 18px 0;
}
.filing-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 24px;
  font-size: 12px;
}
.filing a {
  color: #f8f9fa;
}
.filing-label {
  color: #aeb7c2;
}