/* The guide reads like an editorial handbook: a blue introduction and three clear steps. */
.preclass-guide.section {
  padding: 64px max(4.5%, calc((100% - 1440px) / 2));
  background: #f1f6f9;
  border-block: 1px solid #d3e1eb;
  overflow-anchor: none;
}
.guide-layout { display: grid; grid-template-columns: minmax(240px, .36fr) minmax(0, 1fr); gap: clamp(32px, 4vw, 62px); align-items: start; }
.guide-intro {
  position: sticky;
  top: calc(var(--header-height, 110px) + 24px);
  overflow: hidden;
  isolation: isolate;
  padding: 42px 32px 30px;
  color: #fff;
  background: linear-gradient(155deg, #204c75 0%, #173d64 56%, #12344f 100%);
  border-top: 3px solid #91bedb;
}
.guide-intro::after { content: ""; position: absolute; width: 330px; height: 330px; border: 1px solid #9dc4df25; border-radius: 50%; left: -190px; bottom: -100px; z-index: -1; }
.guide-intro .eyebrow { font-size: 11px; letter-spacing: .18em; color: #b7d5e9; }
.guide-intro h2 { font-size: clamp(32px, 3.15vw, 44px); line-height: 1.5; letter-spacing: .07em; margin-top: 26px; color: #fff; }
.guide-intro-copy { font-size: 16px; line-height: 1.95; color: #d1e3ef; margin-top: 18px; }
.guide-intro-art { margin: 34px -12px 24px; color: #b9daee; opacity: .8; pointer-events: none; }
.guide-intro-art svg { display: block; width: 100%; height: auto; max-height: 190px; }
.guide-route { list-style: none; padding: 0; margin: 0; border-top: 1px solid #83a8c15c; }
.guide-route li { display: flex; align-items: center; gap: 18px; padding: 19px 0; font-size: 17px; border-bottom: 1px solid #83a8c14d; }
.guide-route li > span:first-child { font: 15px/1.5 Georgia, serif; color: #9dc4df; letter-spacing: .08em; }
.guide-main { min-width: 0; }
.guide-tabs { display: flex; gap: 34px; border-bottom: 1px solid #b3cada; margin-bottom: 4px; }
.guide-tabs > [role="tab"] { display: flex; align-items: baseline; gap: 11px; position: relative; min-height: 66px; padding: 13px 0 20px; border: 0; background: transparent; font-size: 24px; color: #627b8f; white-space: nowrap; }
.guide-tabs > [role="tab"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 3px; background: transparent; }
.guide-tabs > [role="tab"][aria-selected="true"] { color: var(--deep); }
.guide-tabs > [role="tab"][aria-selected="true"]::after { background: var(--blue); }
.guide-tabs > [role="tab"]:hover { color: var(--blue); }
.guide-tab-number { font: 14px/1 Georgia, serif; color: #6d91ac; }
.guide-tab-caption { font-size: 12px; color: #6a8192; }
/* Main pages follow their own content height, so contacts stay directly below. */
.guide-panel { min-width: 0; }
.guide-panels > .guide-panel[hidden] { display: none !important; }
/* Keep only the small system switch stable while Mac / Windows requirements change. */
.guide-platform-panels { display: grid; }
.guide-platform { grid-area: 1 / 1; min-width: 0; }
.guide-platform-panels > .guide-platform[hidden] { display: block !important; visibility: hidden; pointer-events: none; }
.guide-preparation-grid { display: grid; grid-template-columns: minmax(0, 1fr); }
.guide-step { padding: 31px 0 35px; border-bottom: 1px solid #c7d9e6; min-width: 0; }
.guide-step-heading { display: flex; align-items: baseline; gap: 20px; margin-bottom: 21px; }
.guide-step-heading > span { flex: 0 0 62px; font: 54px/1.1 Georgia, serif; color: #6a97b8; letter-spacing: -.045em; }
.guide-step h3 { font: 26px/1.5 var(--serif); color: var(--deep); }
.guide-step-body { margin-left: 82px; min-width: 0; }
.guide-device-layout { display: grid; grid-template-columns: minmax(225px, .9fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.guide-device-settings { padding: 20px 23px; background: #e5eff6; border-left: 2px solid #93b8d1; }
.guide-platform-tabs { display: flex; gap: 4px; border-bottom: 1px solid #bed3e2; margin-bottom: 19px; }
.guide-platform-tabs [role="tab"] { position: relative; border: 0; background: transparent; padding: 9px 14px 13px; min-height: 45px; color: #5a768c; font-size: 16px; }
.guide-platform-tabs [role="tab"][aria-selected="true"] { color: var(--blue); font-weight: 600; }
.guide-platform-tabs [role="tab"][aria-selected="true"]::after { content: ""; position: absolute; left: 14px; right: 14px; height: 2px; bottom: -1px; background: var(--blue); }
.guide-platform-tabs [role="tab"]:hover { color: var(--blue); background: #f8fcfe7a; }
.guide-platform h4 { margin: 0 0 6px; font-size: 17px; font-weight: 600; }
.guide-platform p { font-size: 16px; line-height: 1.8; }
.guide-platform .guide-package { color: #546e82; margin-top: 7px; font-size: 15px; }
.guide-package strong { font-weight: 600; color: var(--deep); }
.guide-configuration { margin: 18px 0 0; padding-top: 15px; border-top: 1px solid #bed3e2; font-size: 14px; line-height: 1.85; color: #546e82; }
.guide-configuration strong { display: block; font-weight: 600; color: var(--deep); margin-bottom: 4px; }
.guide-checklist { padding: 2px 0 0; margin: 0; list-style: none; }
.guide-checklist li { position: relative; padding-left: 18px; font-size: 16px; line-height: 1.9; color: #435f74; }
.guide-checklist li + li { margin-top: 16px; }
.guide-checklist li::before { content: ""; position: absolute; width: 5px; height: 5px; border-radius: 50%; background: #729bb9; left: 0; top: .8em; }
.guide-software-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(225px, .8fr); gap: 30px; align-items: start; }
.guide-installation { margin: 0; font-size: 16px; line-height: 1.85; }
.guide-installation > div { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 10px; }
.guide-installation > div + div { margin-top: 12px; }
.guide-installation dt { color: var(--deep); font-size: 15px; font-weight: 600; }
.guide-installation dd { margin: 0; color: #536f83; }
.guide-test { font-size: 16px; line-height: 1.85; margin-top: 19px; padding-top: 16px; border-top: 1px solid #d5e2eb; color: #435f74; }
.guide-test > span { display: block; font-size: 13px; font-weight: 600; color: var(--blue); margin-bottom: 5px; }
.guide-official-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 20px; color: #fff; background: var(--blue); font-size: 15px; min-height: 49px; padding: 12px 17px; border: 1px solid transparent; line-height: 1.7; }
.guide-official-link > span:not(.sr-only) { font-size: 20px; flex-shrink: 0; }
.guide-official-link:hover { color: #fff; background: #174c87; }
.guide-download-area .guide-official-link { display: flex; width: 100%; }
.guide-download-note { color: #647d8f; font-size: 13px; line-height: 1.85; margin-top: 11px; }
.guide-qcc .guide-step-body { display: flex; gap: 24px; align-items: flex-start; justify-content: space-between; }
.guide-qcc-copy { font-size: 16px; line-height: 1.95; color: #435f74; max-width: 31em; }
.guide-qcc .guide-official-link { flex-shrink: 0; }
.guide-help-note { margin-top: 25px; padding: 21px 25px; border-left: 2px solid #9abbd2; background: #e9f1f6; }
.guide-help-note h3 { font: 21px/1.5 var(--serif); margin-bottom: 7px; }
.guide-help-note > p { font-size: 15px; line-height: 1.85; color: #526e83; }
.guide-problem-types { display: flex; flex-wrap: wrap; gap: 7px 18px; margin-top: 12px; }
.guide-problem-types span { color: #54758d; font-size: 13px; padding-left: 10px; border-left: 1px solid #99b9cf; line-height: 1.25; }
.guide-welcome { padding: 30px 0 25px; border-bottom: 1px solid #bfd3e2; font-size: 16px; line-height: 1.95; color: #526e83; }
.guide-salutation { font-family: var(--serif); font-size: 24px; color: var(--deep); margin-bottom: 10px; }
.guide-notice-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 34px; }
.guide-notice-list li { display: grid; grid-template-columns: 31px minmax(0, 1fr); gap: 13px; padding: 27px 0; border-bottom: 1px solid #ccdde8; }
.guide-notice-number { font: 24px/1.5 Georgia, serif; color: #7197b2; }
.guide-notice-list h3 { font: 24px/1.5 var(--serif); margin-bottom: 9px; }
.guide-notice-list p { color: #526e83; font-size: 16px; line-height: 1.9; }
.guide-footer { margin-top: 28px; }
.guide-contacts { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); background: var(--deep); color: white; }
.guide-contacts > a { display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; padding: 22px 24px; align-items: center; }
.guide-contacts > a + a { border-left: 1px solid #61839e; }
.guide-contacts > a:hover { background: #204d76; }
.guide-contacts > a > span:first-child { grid-column: 1 / -1; font-size: 12px; letter-spacing: .06em; color: #c7dbe9; margin-bottom: 5px; }
.guide-contacts strong { font-weight: 500; font-family: var(--serif); font-size: 21px; }
.guide-phone { font-size: 16px; letter-spacing: .015em; white-space: nowrap; font-variant-numeric: tabular-nums; }
.guide-more { display: flex; justify-content: flex-end; gap: 28px; flex-wrap: wrap; margin-top: 18px; }
.guide-more .text-link { font-size: 15px; min-height: 44px; }
#system-requirements { scroll-margin-top: calc(var(--header-height, 110px) + 20px); }
/* Let the whole introduction scroll into view on shorter laptop displays. */
@media (min-width: 901px) and (max-height: 850px) {
  .guide-intro { position: relative; top: auto; }
}
@media (max-width: 1250px) {
  .guide-tab-caption { display: none; }
  .guide-intro { padding: 35px 26px 26px; }
  .guide-layout { grid-template-columns: minmax(225px, .36fr) minmax(0, 1fr); gap: 34px; }
  .guide-step-heading { gap: 16px; }
  .guide-step-heading > span { flex-basis: 52px; font-size: 48px; }
  .guide-step-body { margin-left: 68px; }
  .guide-step h3 { font-size: 25px; }
  .guide-device-layout { grid-template-columns: minmax(215px, .9fr) minmax(0, 1fr); gap: 22px; }
  .guide-device-settings { padding: 18px; }
  .guide-software-layout { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .guide-download-area { max-width: 360px; }
  .guide-qcc .guide-step-body { display: block; }
  .guide-qcc .guide-official-link { margin-top: 20px; }
  .guide-contacts > a { grid-template-columns: minmax(0, 1fr); padding: 20px; }
}
@media (max-width: 1100px) {
  .guide-device-layout { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .guide-device-settings { max-width: 100%; }
  .guide-checklist { padding-top: 0; }
  .guide-checklist li + li { margin-top: 12px; }
  .guide-notice-list { grid-template-columns: minmax(0, 1fr); }
  .guide-notice-list li { padding: 22px 0; }
  .guide-contacts strong { font-size: 20px; }
  .guide-phone { font-size: 15px; }
}
@media (max-width: 900px) {
  .preclass-guide.section { padding: 38px 5%; }
  .guide-layout { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .guide-intro { position: relative; top: auto; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .8fr); column-gap: 25px; padding: 32px; }
  .guide-intro .eyebrow, .guide-intro h2, .guide-intro-copy { grid-column: 1; }
  .guide-intro h2 { margin-top: 17px; font-size: 39px; }
  .guide-intro-copy { font-size: 16px; margin-top: 12px; }
  .guide-intro-art { position: absolute; right: 25px; top: 10px; width: 230px; opacity: .45; margin: 0; }
  .guide-route { grid-column: 2; grid-row: 1 / 5; align-self: end; position: relative; margin-top: 42px; }
  .guide-route li { padding: 14px 0; }
  .guide-tabs { gap: 35px; }
  .guide-tabs > [role="tab"] { font-size: 24px; }
  .guide-tab-caption { display: inline; }
  .guide-step-body { margin-left: 72px; }
  .guide-device-layout { grid-template-columns: minmax(220px, .95fr) minmax(0, 1fr); }
  .guide-software-layout { grid-template-columns: minmax(0, 1fr) minmax(225px, .8fr); gap: 25px; }
  .guide-notice-list { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .guide-contacts > a { grid-template-columns: 1fr auto; padding: 22px; }
}
@media (max-width: 680px) {
  .preclass-guide.section { padding: 24px 20px 35px; }
  .guide-layout { gap: 22px; }
  .guide-intro { display: block; padding: 28px 24px 22px; }
  .guide-intro h2 { font-size: 34px; margin-top: 15px; }
  .guide-intro-copy { font-size: 16px; max-width: 18em; position: relative; }
  .guide-intro-art { right: -25px; top: 0; width: 170px; opacity: .24; }
  .guide-route { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 23px; padding-top: 18px; border-top-color: #83a8c169; }
  .guide-route li { display: block; border-bottom: 0; padding: 0; font-size: 15px; }
  .guide-route li > span:first-child { display: block; font-size: 12px; margin-bottom: 6px; }
  .guide-tabs { gap: 0; margin-bottom: 2px; }
  .guide-tabs > [role="tab"] { flex: 1; justify-content: center; font-size: 22px; gap: 8px; min-height: 62px; padding: 10px 4px 16px; }
  .guide-tab-caption { display: none; }
  .guide-tab-number { font-size: 13px; }
  .guide-step { padding: 26px 0 28px; }
  .guide-step-heading { gap: 15px; margin-bottom: 20px; align-items: baseline; }
  .guide-step-heading > span { font-size: 42px; flex-basis: 49px; }
  .guide-step h3 { font-size: 24px; line-height: 1.55; }
  .guide-step-body { margin-left: 0; }
  .guide-device-layout, .guide-software-layout { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .guide-device-settings { padding: 20px 22px; }
  .guide-platform-tabs [role="tab"] { font-size: 17px; padding-inline: 17px; }
  .guide-platform p, .guide-platform .guide-package, .guide-configuration { font-size: 16px; }
  .guide-checklist li, .guide-installation, .guide-test, .guide-qcc-copy { font-size: 17px; }
  .guide-checklist li + li { margin-top: 14px; }
  .guide-installation > div { grid-template-columns: 76px minmax(0, 1fr); }
  .guide-installation dt { font-size: 16px; }
  .guide-download-area { max-width: none; }
  .guide-official-link { font-size: 16px; min-height: 52px; padding: 12px 18px; }
  .guide-qcc .guide-official-link { display: flex; width: 100%; }
  .guide-download-note { font-size: 14px; }
  .guide-help-note { margin-top: 23px; padding: 20px; }
  .guide-help-note > p { font-size: 16px; }
  .guide-help-note h3 { font-size: 23px; }
  .guide-problem-types { gap: 10px 17px; }
  .guide-problem-types span { font-size: 14px; }
  .guide-welcome { padding-block: 25px; font-size: 17px; }
  .guide-notice-list { grid-template-columns: minmax(0, 1fr); }
  .guide-notice-list li { padding: 24px 0; grid-template-columns: 31px minmax(0, 1fr); }
  .guide-notice-list h3 { font-size: 24px; }
  .guide-notice-list p { font-size: 17px; }
  .guide-footer { margin-top: 24px; }
  .guide-contacts { grid-template-columns: minmax(0, 1fr); }
  .guide-contacts > a { padding: 21px; gap: 4px 12px; }
  .guide-contacts > a + a { border-left: 0; border-top: 1px solid #66839b; }
  .guide-contacts > a > span:first-child { font-size: 13px; }
  .guide-contacts strong { font-size: 22px; }
  .guide-phone { font-size: 17px; }
  .guide-more { justify-content: space-between; gap: 13px; }
  .guide-more .text-link { font-size: 16px; gap: 12px; }
}
@media (max-width: 380px) {
  .preclass-guide.section { padding-inline: 16px; }
  .guide-intro { padding-inline: 21px; }
  .guide-step-heading > span { flex-basis: 43px; font-size: 39px; }
  .guide-step-heading { gap: 12px; }
  .guide-step h3 { font-size: 23px; }
  .guide-device-settings { padding-inline: 18px; }
  .guide-installation > div { grid-template-columns: minmax(0, 1fr); gap: 3px; }
  .guide-contacts > a { grid-template-columns: minmax(0, 1fr); }
}