:root {
  --ink: #17222c;
  --muted: #63717c;
  --paper: #fbfaf6;
  --white: #ffffff;
  --line: #dfe4e2;
  --line-dark: #c8d0cd;
  --mint: #bff4d6;
  --mint-strong: #2b9c68;
  --mint-dark: #1d704d;
  --blue: #305fce;
  --blue-soft: #edf2ff;
  --coral: #ff7a66;
  --yellow: #f8d56c;
  --navy: #17232c;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --shadow: 0 20px 50px rgba(23, 34, 44, 0.09);
  --font: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: "Avenir Next", Avenir, var(--font);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 95px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button,
a,
label,
summary {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

code,
kbd {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

code {
  font-size: 0.93em;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(48, 95, 206, 0.35);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 1000;
  padding: 12px 18px;
  border-radius: 0 0 12px 12px;
  background: var(--navy);
  color: white;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

.top-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 999;
  height: 4px;
  background: rgba(255, 255, 255, 0.6);
}

.top-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--mint-strong));
  transition: width 0.4s ease;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 78px;
  padding: 12px clamp(20px, 4vw, 68px);
  border-bottom: 1px solid rgba(23, 34, 44, 0.08);
  background: rgba(251, 250, 246, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  line-height: 1.15;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  color: white;
  background: var(--navy);
  font-family: "SFMono-Regular", monospace;
  font-weight: 800;
  box-shadow: 4px 4px 0 var(--mint);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: var(--display);
  font-size: 15px;
  letter-spacing: -0.01em;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.quiet-button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  font-weight: 750;
  cursor: pointer;
  transition: 0.2s ease;
}

.quiet-button:hover {
  border-color: var(--ink);
  color: var(--ink);
  transform: translateY(-1px);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  gap: clamp(35px, 6vw, 90px);
  align-items: center;
  min-height: 710px;
  max-width: 1380px;
  margin: 0 auto;
  padding: 80px clamp(24px, 6vw, 96px) 95px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 30px;
  right: -120px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(191, 244, 214, 0.55), rgba(191, 244, 214, 0) 68%);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow span {
  width: 28px;
  height: 2px;
  background: currentColor;
}

.hero h1,
.module-header h2,
.final-challenge h2,
.troubleshooting h2 {
  margin: 0;
  font-family: var(--display);
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.hero h1 {
  max-width: 680px;
  font-size: clamp(48px, 6.2vw, 82px);
  font-weight: 760;
}

.hero h1 em,
.final-challenge h2 em {
  color: var(--blue);
  font-family: Georgia, serif;
  font-weight: 400;
}

.hero-lead {
  max-width: 650px;
  margin: 28px 0 0;
  color: #4e5c67;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 34px;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  padding: 16px 22px;
  border-radius: 14px;
  color: white;
  background: var(--blue);
  box-shadow: 0 10px 25px rgba(48, 95, 206, 0.25);
  font-weight: 800;
  text-decoration: none;
  transition: 0.2s ease;
}

.primary-button span {
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}

.primary-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px rgba(48, 95, 206, 0.3);
}

.time-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.time-pill span {
  font-size: 19px;
}

.hero-reassurance {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin: 32px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  list-style: none;
}

.hero-reassurance span {
  display: inline-grid;
  place-items: center;
  width: 19px;
  height: 19px;
  margin-right: 5px;
  border-radius: 50%;
  color: var(--mint-dark);
  background: var(--mint);
  font-size: 11px;
}

.hero-visual {
  position: relative;
  min-height: 530px;
}

.orbit {
  position: absolute;
  border: 1px dashed rgba(48, 95, 206, 0.2);
  border-radius: 50%;
}

.orbit-one {
  inset: 22px 20px 45px 0;
}

.orbit-two {
  inset: 105px 80px 120px 55px;
}

.window-card {
  position: absolute;
  overflow: hidden;
  border: 1px solid rgba(23, 34, 44, 0.12);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.ui-card {
  z-index: 2;
  top: 35px;
  left: 0;
  width: min(430px, 80%);
  height: 305px;
  background: white;
  transform: rotate(-2deg);
}

.terminal-card {
  z-index: 3;
  right: 0;
  bottom: 35px;
  width: min(390px, 74%);
  height: 245px;
  color: #eef8f1;
  background: #162127;
  transform: rotate(2.5deg);
}

.window-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 42px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  background: #f8f8f6;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.window-bar.dark {
  border-color: rgba(255, 255, 255, 0.08);
  color: #87969d;
  background: #202c32;
}

.mac-dots {
  display: flex;
  gap: 5px;
  justify-self: start;
}

.mac-dots i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff6658;
}

.mac-dots i:nth-child(2) {
  background: #f3bf4f;
}

.mac-dots i:nth-child(3) {
  background: #54c66d;
}

.app-layout {
  display: grid;
  grid-template-columns: 75px 1fr;
  height: calc(100% - 42px);
}

.fake-sidebar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 20px 10px;
  background: #f4f3ef;
}

.mini-logo {
  display: grid;
  place-items: center;
  width: 31px;
  height: 31px;
  margin-bottom: 8px;
  border-radius: 9px;
  color: white;
  background: var(--navy);
  font-family: monospace;
  font-size: 10px;
  font-weight: 900;
}

.fake-sidebar i {
  width: 34px;
  height: 7px;
  border-radius: 10px;
  background: #d9dcd8;
}

.fake-chat {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 25px 30px;
  text-align: center;
}

.hello-chip {
  padding: 6px 12px;
  border-radius: 20px;
  color: var(--mint-dark);
  background: #e6f9ee;
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fake-chat p {
  max-width: 240px;
  margin: 15px 0 30px;
  font-family: var(--display);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.35;
}

.fake-input {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: #97a09f;
  font-size: 9px;
  text-align: left;
}

.fake-input b {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 7px;
  color: white;
  background: var(--blue);
}

.terminal-content {
  padding: 35px 30px;
  font-family: "SFMono-Regular", monospace;
  font-size: 12px;
}

.terminal-content p {
  margin: 0 0 19px;
}

.terminal-content p span {
  margin-right: 9px;
  color: #7fcfa4;
}

.terminal-content .terminal-success {
  color: #9ee8ba;
}

.cursor {
  display: block;
  width: 8px;
  height: 15px;
  margin-left: 18px;
  background: #9ee8ba;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.bridge-arrow {
  position: absolute;
  z-index: 5;
  top: 47%;
  left: 50%;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 5px solid var(--paper);
  border-radius: 50%;
  color: white;
  background: var(--coral);
  font-size: 24px;
  font-weight: 900;
  transform: translate(-50%, -50%);
  box-shadow: 0 8px 20px rgba(255, 122, 102, 0.25);
}

.route-badge {
  position: absolute;
  z-index: 6;
  right: 20px;
  top: 15px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: white;
  box-shadow: 0 8px 20px rgba(23, 34, 44, 0.07);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.route-badge span {
  margin: 0 5px;
  color: var(--coral);
}

.course-intro {
  display: grid;
  grid-template-columns: repeat(3, minmax(190px, 1fr)) minmax(280px, 1.2fr);
  max-width: 1380px;
  margin: 0 auto;
  padding: 28px clamp(24px, 6vw, 96px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.course-intro > div {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-right: 25px;
  border-right: 1px solid var(--line);
}

.course-intro > div + div {
  padding-left: 25px;
}

.intro-number {
  color: var(--blue);
  font-family: var(--display);
  font-size: 42px;
  font-weight: 850;
  line-height: 1;
}

.course-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.course-intro p strong {
  color: var(--ink);
  font-size: 14px;
}

.course-intro .intro-note {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 30px;
  color: var(--ink);
  font-weight: 650;
}

.intro-note span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  color: var(--mint-dark);
  background: var(--mint);
}

.course-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 880px);
  gap: clamp(40px, 6vw, 90px);
  justify-content: center;
  align-items: start;
  max-width: 1320px;
  margin: 0 auto;
  padding: 85px 35px 120px;
}

.course-sidebar {
  position: sticky;
  top: 105px;
}

.progress-card {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: white;
  box-shadow: 0 8px 30px rgba(23, 34, 44, 0.05);
}

.progress-ring {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: conic-gradient(var(--blue) 0%, #e9edeb 0);
  transition: background 0.4s ease;
}

.progress-ring::before {
  content: "";
  grid-area: 1 / 1;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: white;
}

.progress-ring div {
  z-index: 1;
  display: flex;
  grid-area: 1 / 1;
  align-items: baseline;
}

.progress-ring strong {
  font-size: 17px;
  line-height: 1;
}

.progress-ring span {
  font-size: 9px;
  font-weight: 800;
}

.progress-card small,
.progress-card > div > strong {
  display: block;
}

.progress-card small {
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.progress-card > div > strong {
  margin-top: 4px;
  font-size: 13px;
}

.module-nav {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 22px;
}

.module-nav a {
  display: grid;
  grid-template-columns: 33px 1fr 22px;
  align-items: center;
  min-height: 42px;
  padding: 7px 10px;
  border-radius: 10px;
  color: #73808a;
  font-size: 12px;
  text-decoration: none;
  transition: 0.2s ease;
}

.module-nav a span {
  font-family: "SFMono-Regular", monospace;
  font-size: 10px;
  font-weight: 850;
}

.module-nav a b {
  font-weight: 700;
}

.module-nav a i {
  display: none;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: var(--mint-dark);
  background: var(--mint);
  font-size: 9px;
  font-style: normal;
  font-weight: 900;
}

.module-nav a:hover,
.module-nav a.active {
  color: var(--ink);
  background: #efeee9;
}

.module-nav a.active span {
  color: var(--blue);
}

.module-nav a.complete i {
  display: grid;
}

.module-nav .nav-final {
  margin-top: 8px;
  border: 1px solid var(--line);
  color: var(--ink);
}

.module-nav .nav-final span {
  color: #d09b20;
}

.help-card {
  position: relative;
  margin-top: 25px;
  padding: 18px 16px 16px 48px;
  border-radius: 16px;
  background: var(--blue-soft);
}

.help-card > span {
  position: absolute;
  top: 17px;
  left: 15px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: white;
  background: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.help-card p {
  margin: 0;
  color: #52637c;
  font-size: 11px;
  line-height: 1.5;
}

.help-card p strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 12px;
}

.help-card a {
  display: inline-block;
  margin-top: 9px;
  color: var(--blue);
  font-size: 10px;
  font-weight: 850;
  text-decoration: none;
  text-transform: uppercase;
}

.course-content {
  min-width: 0;
}

.module {
  position: relative;
  margin-bottom: 70px;
  padding: clamp(30px, 5vw, 64px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: white;
  box-shadow: 0 10px 50px rgba(23, 34, 44, 0.045);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.module.is-complete {
  border-color: #9fdfbd;
  box-shadow: 0 10px 50px rgba(43, 156, 104, 0.08);
}

.module-header {
  margin-bottom: 32px;
}

.module-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  color: var(--blue);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.module-kicker i {
  width: 35px;
  height: 1px;
  background: var(--line-dark);
}

.module-kicker small {
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0;
}

.module-header h2 {
  max-width: 700px;
  font-size: clamp(37px, 5vw, 58px);
}

.module-header > p {
  max-width: 670px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.objective-box {
  display: flex;
  align-items: center;
  gap: 17px;
  margin: 30px 0 35px;
  padding: 18px 20px;
  border-left: 4px solid var(--blue);
  border-radius: 0 13px 13px 0;
  background: var(--blue-soft);
}

.objective-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 2px solid var(--blue);
  border-radius: 50%;
  color: var(--blue);
  font-size: 20px;
}

.objective-box small,
.objective-box strong {
  display: block;
}

.objective-box small {
  margin-bottom: 3px;
  color: var(--blue);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.objective-box strong {
  font-size: 14px;
}

.lesson-block {
  padding: 35px 0;
  border-top: 1px solid var(--line);
}

.lesson-block h3 {
  display: flex;
  align-items: center;
  gap: 13px;
  margin: 0 0 25px;
  font-family: var(--display);
  font-size: 20px;
  line-height: 1.3;
}

.lesson-block h3 > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  color: var(--blue);
  background: var(--blue-soft);
  font-family: "SFMono-Regular", monospace;
  font-size: 12px;
  font-weight: 900;
}

.split-content {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 35px;
  align-items: center;
}

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

.friendly-steps li {
  position: relative;
  margin-bottom: 17px;
  padding-left: 30px;
  color: #4e5b65;
  font-size: 15px;
  counter-increment: friendly;
}

.friendly-steps li::before {
  content: counter(friendly) ".";
  position: absolute;
  left: 0;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.friendly-steps.roomy li {
  margin-bottom: 20px;
  padding-left: 42px;
}

.friendly-steps.roomy li::before {
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  color: var(--blue);
  background: var(--blue-soft);
  content: counter(friendly);
}

.mac-about-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #f8f8f5;
  text-align: center;
  box-shadow: 0 12px 25px rgba(23, 34, 44, 0.06);
}

.apple-mark {
  display: block;
  margin-bottom: 7px;
  font-size: 28px;
}

.mac-about-card > strong {
  display: block;
  font-size: 20px;
}

.mac-about-card p {
  margin: 2px 0 13px;
  color: var(--muted);
  font-size: 12px;
}

.mac-about-card mark {
  padding: 1px 4px;
  color: var(--mint-dark);
  background: var(--mint);
}

.mac-about-card hr {
  border: 0;
  border-top: 1px solid var(--line);
}

.mac-about-card small,
.mac-about-card b {
  display: block;
}

.mac-about-card small {
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  text-transform: uppercase;
}

.mac-about-card b {
  margin-top: 2px;
  font-size: 13px;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 13px;
  margin-bottom: 10px;
}

.result-card {
  display: flex;
  gap: 13px;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.result-card > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 29px;
  height: 29px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 900;
}

.success-card {
  border-color: #c6ead6;
  background: #f3fbf6;
}

.success-card > span {
  color: var(--mint-dark);
  background: var(--mint);
}

.warning-card {
  border-color: #f2deb2;
  background: #fffaf0;
}

.warning-card > span {
  color: #805d0b;
  background: var(--yellow);
}

.result-card strong {
  font-size: 13px;
}

.result-card p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

.compact-block {
  padding-bottom: 22px;
}

.preflight-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.preflight-list label {
  position: relative;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: #4f5c66;
  font-size: 12px;
  font-weight: 650;
  cursor: pointer;
}

.preflight-list input,
.challenge-grid input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.preflight-list label > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 19px;
  height: 19px;
  border: 1px solid var(--line-dark);
  border-radius: 5px;
  background: white;
}

.preflight-list input:checked + span {
  border-color: var(--mint-strong);
  background: var(--mint);
}

.preflight-list input:checked + span::after {
  content: "✓";
  color: var(--mint-dark);
  font-size: 10px;
  font-weight: 900;
}

.plain-note,
.warning-note,
.security-note {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  margin: 20px 0;
  padding: 17px 18px;
  border-radius: 13px;
}

.plain-note {
  background: #f2f3f1;
}

.plain-note > span,
.security-note > span {
  flex: 0 0 auto;
}

.plain-note p,
.warning-note p,
.security-note p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.plain-note strong,
.warning-note strong,
.security-note strong {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
}

.warning-note {
  border: 1px solid #f1d9a2;
  background: #fff9ec;
}

.warning-note > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: #7b5b0f;
  background: var(--yellow);
  font-size: 12px;
  font-weight: 900;
}

.security-note {
  margin-top: 25px;
  background: var(--blue-soft);
}

.module-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-top: 35px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.validate-module {
  position: relative;
  display: flex;
  align-items: center;
  gap: 13px;
  cursor: pointer;
}

.validate-module input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.validation-check {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 39px;
  height: 39px;
  border: 2px solid var(--line-dark);
  border-radius: 12px;
  color: transparent;
  background: white;
  font-size: 16px;
  font-weight: 900;
  transition: 0.2s ease;
}

.validate-module input:checked + .validation-check {
  border-color: var(--mint-strong);
  color: var(--mint-dark);
  background: var(--mint);
  transform: rotate(-3deg) scale(1.05);
}

.validate-module small,
.validate-module strong {
  display: block;
}

.validate-module small {
  color: var(--blue);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.11em;
}

.validate-module strong {
  margin-top: 2px;
  font-size: 12px;
}

.next-module {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 850;
  text-decoration: none;
  text-transform: uppercase;
}

.next-module span {
  display: grid;
  place-items: center;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  color: var(--blue);
  background: var(--blue-soft);
}

.name-explainer {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 10px 0 28px;
  padding: 18px;
  border: 1px dashed var(--line-dark);
  border-radius: 16px;
  background: #fafaf8;
}

.name-explainer .app-icon,
.name-explainer .codex-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  color: white;
  background: var(--navy);
  font-weight: 900;
}

.name-explainer .app-icon {
  background: white;
  color: var(--ink);
  border: 1px solid var(--line);
  font-size: 22px;
}

.name-explainer div {
  min-width: 0;
}

.name-explainer strong,
.name-explainer small {
  display: block;
}

.name-explainer strong {
  font-size: 12px;
}

.name-explainer small {
  color: var(--muted);
  font-size: 7px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.explainer-arrow {
  margin: 0 auto;
  color: var(--coral);
  font-size: 22px;
}

.instruction-lead {
  margin: -8px 0 18px;
  color: var(--muted);
  font-size: 13px;
}

.download-button {
  display: flex;
  align-items: center;
  gap: 15px;
  max-width: 560px;
  padding: 17px 18px;
  border-radius: 14px;
  color: white;
  background: var(--navy);
  box-shadow: 0 10px 25px rgba(23, 34, 44, 0.18);
  text-decoration: none;
  transition: 0.2s ease;
}

.download-button:hover {
  transform: translateY(-2px);
}

.download-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  color: var(--navy);
  background: var(--mint);
  font-size: 19px;
  font-weight: 900;
}

.download-button small,
.download-button strong {
  display: block;
}

.download-button small {
  margin-bottom: 2px;
  color: #a9b7bc;
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.download-button strong {
  font-size: 14px;
}

.download-button > i {
  margin-left: auto;
  color: #a9b7bc;
  font-style: normal;
}

.microcopy {
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 10px;
}

.install-steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: center;
}

.install-step {
  text-align: center;
}

.step-picture {
  display: grid;
  place-items: center;
  width: 100%;
  height: 105px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #f5f5f2;
}

.download-picture i {
  display: grid;
  place-items: center;
  width: 43px;
  height: 43px;
  border-radius: 50%;
  color: white;
  background: var(--blue);
  font-size: 20px;
  font-style: normal;
  font-weight: 900;
}

.file-picture i,
.file-picture small {
  grid-area: 1 / 1;
}

.file-picture i {
  padding: 14px 9px 22px;
  border: 1px solid var(--line-dark);
  border-radius: 7px;
  background: white;
  font-size: 8px;
  font-style: normal;
  font-weight: 850;
}

.file-picture small {
  align-self: end;
  margin-bottom: 20px;
  color: var(--muted);
  font-size: 7px;
}

.drag-picture {
  display: flex;
  gap: 9px;
}

.drag-picture i,
.drag-picture b {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  color: white;
  background: var(--navy);
  font-style: normal;
}

.drag-picture b {
  color: #72808b;
  background: #e3e5e2;
}

.drag-picture em {
  color: var(--coral);
  font-style: normal;
}

.install-step > b {
  display: inline-grid;
  place-items: center;
  width: 19px;
  height: 19px;
  margin-right: 4px;
  border-radius: 50%;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 9px;
}

.install-step > strong {
  font-size: 11px;
}

.install-step p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.4;
}

.install-arrow {
  color: var(--coral);
  font-size: 18px;
}

.help-detail {
  overflow: hidden;
  margin: 20px 0;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fafaf8;
}

.help-detail summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 17px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

.help-detail summary::-webkit-details-marker {
  display: none;
}

.help-detail summary span {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  color: white;
  background: var(--blue);
  font-size: 10px;
}

.help-detail > div {
  padding: 0 17px 17px 49px;
  color: var(--muted);
  font-size: 12px;
}

.ui-demo {
  position: relative;
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 280px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: white;
  box-shadow: var(--shadow);
}

.demo-sidebar {
  padding: 17px;
  background: #f2f1ed;
}

.demo-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 8px;
  border-radius: 9px;
  background: white;
  box-shadow: 0 5px 15px rgba(23, 34, 44, 0.06);
}

.codex-icon.small {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  color: white;
  background: var(--navy);
  font-family: monospace;
  font-size: 8px;
}

.demo-switcher strong {
  font-size: 9px;
}

.demo-switcher b {
  margin-left: auto;
  font-size: 9px;
}

.demo-sidebar button {
  width: 100%;
  padding: 10px;
  border: 0;
  border-radius: 8px;
  color: white;
  background: var(--blue);
  font-size: 9px;
  font-weight: 800;
  text-align: left;
}

.demo-sidebar > i {
  display: block;
  width: 75%;
  height: 7px;
  margin-top: 17px;
  border-radius: 10px;
  background: #d9dcd8;
}

.demo-main {
  position: relative;
  display: grid;
  place-items: center;
  padding: 40px;
  text-align: center;
}

.demo-main > div > span {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  margin: 0 auto 12px;
  border-radius: 14px;
  color: white;
  background: var(--navy);
  font-family: monospace;
  font-size: 12px;
  font-weight: 900;
}

.demo-main h4 {
  margin: 0;
  font-family: var(--display);
  font-size: 17px;
}

.demo-main p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 10px;
}

.click-hint {
  position: absolute;
  top: 16px;
  left: 17px;
  color: var(--coral);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.click-hint i {
  font-size: 18px;
  font-style: normal;
}

.under-demo {
  margin: 15px 0 0;
  color: var(--muted);
  font-size: 11px;
  text-align: center;
}

.folder-rule {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 30px;
  align-items: center;
  margin: 25px 0 35px;
  padding: 25px;
  border-radius: 20px;
  background: #f3f4f1;
}

.folder-illustration {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  height: 125px;
  padding: 20px;
  border-radius: 8px 17px 17px 17px;
  color: #72590b;
  background: var(--yellow);
  box-shadow: 8px 9px 0 #e9c04c;
}

.folder-illustration::before {
  content: "";
  position: absolute;
  top: -13px;
  left: 0;
  width: 65px;
  height: 22px;
  border-radius: 9px 9px 0 0;
  background: var(--yellow);
}

.folder-illustration span {
  display: grid;
  place-items: center;
  width: 37px;
  height: 37px;
  margin-bottom: 9px;
  border-radius: 50%;
  color: #72590b;
  background: rgba(255, 255, 255, 0.42);
}

.folder-illustration span::after {
  content: "✓";
  font-weight: 900;
}

.folder-illustration strong {
  font-family: "SFMono-Regular", monospace;
  font-size: 10px;
}

.folder-rule small {
  color: var(--blue);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.11em;
}

.folder-rule h3 {
  margin: 5px 0 8px;
  font-family: var(--display);
  font-size: 21px;
  line-height: 1.25;
}

.folder-rule p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.permission-card {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 15px 0;
  padding: 20px;
  border: 1px solid #b9dbc9;
  border-radius: 16px;
  background: #f4fbf7;
}

.shield-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 47px;
  height: 47px;
  border-radius: 14px;
  color: var(--mint-dark);
  background: var(--mint);
  font-size: 25px;
}

.permission-card small,
.permission-card strong,
.permission-card p {
  display: block;
}

.permission-card small {
  color: var(--mint-dark);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.09em;
}

.permission-card strong {
  font-size: 14px;
}

.permission-card p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 10px;
}

.permission-status {
  margin-left: auto;
  padding: 6px 9px;
  border-radius: 50px;
  color: var(--mint-dark);
  background: white;
  font-size: 8px;
  font-weight: 900;
  white-space: nowrap;
}

.permission-status i {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 4px;
  border-radius: 50%;
  background: var(--mint-strong);
}

.prompt-card {
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: 15px;
  background: #fafaf8;
}

.prompt-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  padding: 10px 13px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  background: white;
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.11em;
}

.prompt-top button,
.mini-prompt button,
.command-card button {
  flex: 0 0 auto;
  padding: 6px 10px;
  border: 0;
  border-radius: 7px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 9px;
  font-weight: 850;
  cursor: pointer;
}

.prompt-top button i {
  margin-left: 3px;
  font-style: normal;
}

.prompt-card blockquote {
  margin: 0;
  padding: 22px;
  color: #394852;
  font-family: Georgia, serif;
  font-size: 16px;
  line-height: 1.75;
}

.featured-prompt {
  border-color: #9fb7ed;
  box-shadow: 0 10px 25px rgba(48, 95, 206, 0.08);
}

.featured-prompt .prompt-top {
  color: var(--blue);
  background: var(--blue-soft);
}

.expected-result {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.expected-result > span {
  display: grid;
  place-items: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  color: var(--mint-dark);
  background: var(--mint);
  font-size: 9px;
  font-weight: 900;
}

.expected-result strong {
  color: var(--ink);
}

.review-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: center;
  margin: 20px 0 30px;
}

.review-flow > div {
  min-height: 120px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 13px;
  text-align: center;
}

.review-flow div > span {
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  margin: 0 auto 8px;
  border-radius: 50%;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 10px;
  font-weight: 900;
}

.review-flow strong {
  font-size: 11px;
}

.review-flow p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.4;
}

.review-flow > i {
  color: var(--coral);
  font-style: normal;
}

.highlight-module {
  border: 2px solid var(--blue);
  box-shadow: 0 18px 60px rgba(48, 95, 206, 0.12);
}

.milestone-ribbon {
  position: absolute;
  top: 0;
  right: 40px;
  padding: 8px 13px;
  border-radius: 0 0 10px 10px;
  color: white;
  background: var(--blue);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.milestone-ribbon span {
  margin-right: 6px;
  color: var(--mint);
  letter-spacing: 0.12em;
}

.dark-objective {
  border-color: var(--mint);
  color: white;
  background: var(--navy);
}

.dark-objective small {
  color: var(--mint);
}

.dark-objective .objective-icon {
  border-color: var(--mint);
  color: var(--mint);
}

.install-prompt {
  border-color: var(--navy);
  color: white;
  background: var(--navy);
}

.install-prompt .prompt-top {
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--mint);
  background: #202e36;
}

.install-prompt blockquote {
  color: #f1f4f3;
  font-family: var(--font);
  font-size: 14px;
}

.approval-guide {
  overflow: hidden;
  margin: 25px 0;
  border: 1px solid #b9dbc9;
  border-radius: 18px;
  background: #f4fbf7;
}

.approval-title {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 20px;
  border-bottom: 1px solid #cde7d8;
}

.approval-title > span {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  color: var(--mint-dark);
  background: var(--mint);
  font-size: 22px;
}

.approval-title small {
  color: var(--mint-dark);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.approval-title h3 {
  margin: 1px 0 0;
  font-family: var(--display);
  font-size: 17px;
}

.approval-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.approval-columns > div {
  padding: 20px;
}

.approval-columns > div + div {
  border-left: 1px solid #cde7d8;
}

.approval-number {
  display: block;
  margin-bottom: 5px;
  color: var(--mint-strong);
  font-family: monospace;
  font-size: 10px;
  font-weight: 900;
}

.approval-columns strong {
  font-size: 13px;
}

.approval-columns p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 10px;
}

.approval-rule {
  margin: 0;
  padding: 13px 20px;
  border-top: 1px solid #cde7d8;
  background: white;
  color: var(--muted);
  font-size: 10px;
}

.approval-rule > span {
  margin-right: 5px;
  color: var(--mint-strong);
  font-weight: 900;
}

.strong-warning {
  border-color: #efc6be;
  background: #fff5f3;
}

.strong-warning > span {
  color: #893829;
  background: #ffb6aa;
}

.terminal-result {
  overflow: hidden;
  border-radius: 15px;
  color: #eaf4ed;
  background: var(--navy);
  font-family: "SFMono-Regular", monospace;
  font-size: 12px;
}

.terminal-result > div {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #94a3aa;
}

.terminal-result > div small {
  font-size: 8px;
  letter-spacing: 0.1em;
}

.terminal-result > p {
  margin: 0;
  padding: 20px 25px 0;
}

.terminal-result p > span {
  margin-right: 10px;
  color: #84d7a9;
}

.terminal-result .result-line {
  padding-top: 7px;
  color: #a9efc4;
}

.terminal-result .success-line {
  margin-top: 20px;
  padding: 12px 25px;
  color: #bdd0c4;
  background: rgba(191, 244, 214, 0.06);
  font-family: var(--font);
  font-size: 10px;
}

.mini-prompt {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
  padding: 12px;
  border-radius: 10px;
  background: white;
}

.mini-prompt code {
  color: #46545d;
  font-family: var(--font);
  font-size: 10px;
  line-height: 1.55;
}

.terminal-basics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 25px 0 35px;
}

.terminal-concept {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fafaf8;
}

.terminal-concept > span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 10px;
  color: var(--blue);
  background: var(--blue-soft);
  font-weight: 900;
}

.terminal-concept strong {
  font-size: 12px;
}

.terminal-concept p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
}

kbd {
  padding: 2px 5px;
  border: 1px solid #d0d6d3;
  border-bottom-width: 2px;
  border-radius: 5px;
  color: #35414a;
  background: white;
  box-shadow: 0 1px 0 #d0d6d3;
  font-size: 0.85em;
}

.command-lesson {
  padding: 28px 0;
}

.command-card {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
  border-radius: 12px;
  color: #eef7f1;
  background: var(--navy);
  box-shadow: 0 8px 20px rgba(23, 34, 44, 0.15);
}

.command-card > span {
  align-self: stretch;
  display: grid;
  place-items: center;
  width: 45px;
  color: var(--mint);
  background: #202e36;
  font-family: monospace;
  font-weight: 900;
}

.command-card code {
  flex: 1;
  padding: 14px 0;
  font-size: 13px;
}

.command-card button {
  margin-right: 10px;
  color: var(--navy);
  background: var(--mint);
}

.after-command {
  margin-top: 15px;
}

.terminal-prompt {
  color: white;
  background: var(--navy);
}

.terminal-prompt .prompt-top {
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--mint);
  background: #202e36;
}

.terminal-prompt blockquote {
  color: #edf5ef;
  font-family: var(--font);
  font-size: 13px;
}

.prompt-formula {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 9px;
  align-items: center;
  margin: 25px 0 35px;
}

.prompt-formula > div {
  min-height: 115px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fafaf8;
}

.prompt-formula div > span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-bottom: 10px;
  border-radius: 50%;
  color: white;
  background: var(--blue);
  font-size: 9px;
  font-weight: 900;
}

.prompt-formula small,
.prompt-formula strong {
  display: block;
}

.prompt-formula small {
  color: var(--muted);
  font-size: 7px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.prompt-formula strong {
  margin-top: 3px;
  font-family: Georgia, serif;
  font-size: 10px;
}

.prompt-formula > b {
  color: var(--coral);
  font-size: 16px;
}

.safety-rules {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 30px 0;
}

.safety-rules article {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.safety-rules span {
  color: var(--coral);
  font-family: monospace;
  font-size: 9px;
  font-weight: 900;
}

.safety-rules h3 {
  margin: 8px 0 4px;
  font-family: var(--display);
  font-size: 15px;
}

.safety-rules p {
  margin: 0;
  color: var(--muted);
  font-size: 10px;
}

.knowledge-check {
  margin-top: 35px;
  padding: 25px;
  border-radius: 18px;
  color: white;
  background: var(--navy);
}

.knowledge-title {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-bottom: 20px;
}

.knowledge-title > span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: var(--navy);
  background: var(--mint);
  font-weight: 900;
}

.knowledge-title small {
  color: var(--mint);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.knowledge-title h3 {
  margin: 2px 0 0;
  font-family: var(--display);
  font-size: 18px;
}

.knowledge-check fieldset {
  margin: 0;
  padding: 17px 0;
  border: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.knowledge-check legend {
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 750;
}

.knowledge-check fieldset label {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin-top: 8px;
  color: #b9c4c8;
  font-size: 10px;
  cursor: pointer;
}

.knowledge-check fieldset.correct {
  box-shadow: inset 3px 0 var(--mint-strong);
  padding-left: 14px;
}

.knowledge-check fieldset.incorrect {
  box-shadow: inset 3px 0 var(--coral);
  padding-left: 14px;
}

.quiz-button {
  margin-top: 10px;
  padding: 11px 16px;
  border: 0;
  border-radius: 10px;
  color: var(--navy);
  background: var(--mint);
  font-size: 10px;
  font-weight: 900;
  cursor: pointer;
}

.quiz-result {
  display: inline-block;
  margin: 0 0 0 12px;
  color: #b9c4c8;
  font-size: 10px;
}

.final-challenge {
  position: relative;
  overflow: hidden;
  margin-bottom: 70px;
  padding: clamp(35px, 6vw, 70px);
  border-radius: var(--radius-lg);
  color: white;
  background: var(--navy);
  box-shadow: 0 25px 70px rgba(23, 34, 44, 0.2);
}

.final-challenge::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -130px;
  bottom: -170px;
  width: 450px;
  height: 450px;
  border: 1px solid rgba(191, 244, 214, 0.13);
  border-radius: 50%;
  box-shadow: 0 0 0 60px rgba(191, 244, 214, 0.04), 0 0 0 120px rgba(191, 244, 214, 0.025);
}

.final-challenge > * {
  position: relative;
  z-index: 1;
}

.final-stars {
  position: absolute;
  top: 35px;
  right: 45px;
  color: var(--mint);
  font-size: 17px;
}

.final-stars span {
  margin: 0 9px;
  color: var(--yellow);
  font-size: 9px;
}

.eyebrow.light {
  color: var(--mint);
}

.final-challenge h2 {
  max-width: 680px;
  font-size: clamp(43px, 6vw, 65px);
}

.final-challenge h2 em {
  color: var(--mint);
}

.final-lead {
  max-width: 600px;
  margin: 20px 0 30px;
  color: #b8c4c9;
  font-size: 14px;
}

.challenge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.challenge-grid label {
  display: grid;
  grid-template-columns: 38px 1fr 24px;
  align-items: center;
  gap: 11px;
  min-height: 72px;
  padding: 13px 15px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.035);
  cursor: pointer;
  transition: 0.2s ease;
}

.challenge-grid label:hover {
  background: rgba(255, 255, 255, 0.06);
}

.challenge-grid label > span {
  color: var(--mint);
  font-family: monospace;
  font-size: 10px;
  font-weight: 900;
}

.challenge-grid strong {
  font-size: 11px;
  line-height: 1.4;
}

.challenge-grid i {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 7px;
  color: transparent;
  font-size: 10px;
  font-style: normal;
}

.challenge-grid label:has(input:checked) {
  border-color: var(--mint-strong);
  background: rgba(191, 244, 214, 0.08);
}

.challenge-grid input:checked ~ i {
  border-color: var(--mint);
  color: var(--navy);
  background: var(--mint);
}

.final-validation {
  margin-top: 25px;
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.final-check .validation-check {
  border-color: rgba(255, 255, 255, 0.3);
  background: transparent;
}

.final-check small {
  color: var(--mint);
}

.certificate {
  display: none;
  margin-top: 32px;
  padding: 27px;
  border: 1px solid rgba(191, 244, 214, 0.35);
  border-radius: 18px;
  background: rgba(191, 244, 214, 0.06);
  text-align: center;
}

.certificate.visible {
  display: block;
  animation: appear 0.45s ease both;
}

@keyframes appear {
  from { opacity: 0; transform: translateY(10px); }
}

.certificate-mark {
  display: grid;
  place-items: center;
  width: 45px;
  height: 45px;
  margin: 0 auto 13px;
  border-radius: 13px;
  color: var(--navy);
  background: var(--mint);
  font-family: monospace;
  font-weight: 900;
}

.certificate > small {
  color: var(--mint);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.certificate h3 {
  margin: 3px 0 6px;
  font-family: Georgia, serif;
  font-size: 32px;
  font-weight: 400;
}

.certificate p {
  max-width: 500px;
  margin: 0 auto 17px;
  color: #b8c4c9;
  font-size: 11px;
}

.certificate label {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  color: #b8c4c9;
  font-size: 9px;
  font-weight: 800;
  text-transform: uppercase;
}

.certificate input {
  width: 180px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: white;
  background: rgba(255, 255, 255, 0.05);
  text-transform: none;
}

.certificate button {
  margin-top: 15px;
  padding: 10px 14px;
  border: 0;
  border-radius: 9px;
  color: var(--navy);
  background: var(--mint);
  font-size: 9px;
  font-weight: 900;
  cursor: pointer;
}

.troubleshooting {
  margin: 80px 0;
}

.troubleshooting header {
  max-width: 670px;
  margin-bottom: 30px;
}

.troubleshooting h2 {
  font-size: clamp(38px, 5vw, 56px);
}

.troubleshooting header > p:last-child {
  color: var(--muted);
  font-size: 14px;
}

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

.trouble-list details {
  border-bottom: 1px solid var(--line-dark);
}

.trouble-list summary {
  display: grid;
  grid-template-columns: 45px 1fr 28px;
  align-items: center;
  gap: 12px;
  min-height: 68px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

.trouble-list summary::-webkit-details-marker {
  display: none;
}

.trouble-list summary span {
  color: var(--blue);
  font-family: monospace;
  font-size: 10px;
  font-weight: 900;
}

.trouble-list summary strong {
  font-size: 13px;
}

.trouble-list summary i {
  color: var(--muted);
  font-size: 17px;
  font-style: normal;
  transition: transform 0.2s;
}

.trouble-list details[open] summary i {
  transform: rotate(45deg);
}

.trouble-list details > div {
  max-width: 690px;
  padding: 0 0 20px 57px;
  color: var(--muted);
  font-size: 12px;
}

.cheat-sheet {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: white;
  box-shadow: var(--shadow);
}

.cheat-sheet header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
}

.cheat-sheet header span {
  color: var(--blue);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.cheat-sheet header h2 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: 26px;
  font-weight: 400;
}

.memo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.memo-grid > div {
  min-height: 90px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--line);
}

.memo-grid > div:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.memo-grid small,
.memo-grid strong,
.memo-grid code {
  display: block;
}

.memo-grid small {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 7px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.memo-grid strong,
.memo-grid code {
  font-size: 12px;
}

.memo-grid code {
  color: var(--mint-dark);
  font-weight: 800;
}

.magic-phrase {
  padding: 22px 28px;
  background: var(--blue-soft);
}

.magic-phrase span {
  color: var(--blue);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.magic-phrase p {
  margin: 6px 0 0;
  color: #38495f;
  font-family: Georgia, serif;
  font-size: 15px;
}

.site-footer {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 35px;
  align-items: start;
  padding: 55px clamp(25px, 6vw, 95px) 30px;
  color: #b9c4c8;
  background: #111b21;
}

.site-footer > div {
  display: flex;
  align-items: center;
  gap: 15px;
}

.site-footer .brand-mark {
  background: #25323a;
  box-shadow: 4px 4px 0 rgba(191, 244, 214, 0.2);
}

.site-footer p {
  margin: 0;
  font-size: 10px;
  line-height: 1.5;
}

.site-footer p strong {
  color: white;
  font-size: 12px;
}

.site-footer nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px 20px;
}

.site-footer nav a {
  color: #b9c4c8;
  font-size: 9px;
  text-decoration: none;
}

.site-footer nav a:hover {
  color: var(--mint);
}

.site-footer > small {
  grid-column: 1 / -1;
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 8px;
}

.toast {
  position: fixed;
  z-index: 1000;
  right: 24px;
  bottom: 24px;
  max-width: min(390px, calc(100vw - 48px));
  padding: 13px 17px;
  border-radius: 11px;
  color: white;
  background: var(--navy);
  box-shadow: 0 12px 35px rgba(23, 34, 44, 0.25);
  font-size: 11px;
  font-weight: 750;
  opacity: 0;
  pointer-events: none;
  transform: translateY(15px);
  transition: 0.25s ease;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

dialog {
  max-width: 430px;
  padding: 0;
  border: 0;
  border-radius: 20px;
  box-shadow: 0 25px 80px rgba(23, 34, 44, 0.3);
}

dialog::backdrop {
  background: rgba(17, 27, 33, 0.55);
  backdrop-filter: blur(4px);
}

dialog form {
  padding: 32px;
  text-align: center;
}

.dialog-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
  border-radius: 50%;
  color: #8a3c31;
  background: #ffe1dc;
  font-size: 22px;
}

dialog h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 23px;
}

dialog p {
  margin: 10px 0 22px;
  color: var(--muted);
  font-size: 12px;
}

dialog form > div {
  display: flex;
  justify-content: center;
  gap: 9px;
}

dialog button {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: white;
  font-size: 10px;
  font-weight: 850;
  cursor: pointer;
}

dialog .danger-button {
  border-color: #e96855;
  color: white;
  background: #e96855;
}

@media (max-width: 1100px) {
  .hero {
    grid-template-columns: 1fr 0.88fr;
    min-height: 660px;
    padding-inline: 45px;
  }

  .course-intro {
    padding-inline: 40px;
  }

  .course-shell {
    grid-template-columns: 225px minmax(0, 1fr);
    gap: 40px;
    padding-inline: 25px;
  }

  .module {
    padding: 42px;
  }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 60px 30px 70px;
  }

  .hero-copy {
    max-width: 710px;
  }

  .hero-visual {
    width: min(650px, 100%);
    min-height: 480px;
    margin: 0 auto;
  }

  .course-intro {
    grid-template-columns: repeat(3, 1fr);
    padding-inline: 30px;
  }

  .course-intro .intro-note {
    grid-column: 1 / -1;
    margin-top: 18px;
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
  }

  .course-shell {
    display: block;
    max-width: 850px;
  }

  .course-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 230px 1fr;
    gap: 18px;
    margin-bottom: 35px;
  }

  .progress-card {
    align-self: start;
  }

  .module-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin-top: 0;
  }

  .module-nav a {
    grid-template-columns: 28px 1fr 18px;
    min-height: 38px;
  }

  .help-card {
    display: none;
  }
}

@media (max-width: 700px) {
  body {
    font-size: 15px;
  }

  .site-header {
    min-height: 66px;
    padding-inline: 16px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
  }

  .brand small,
  .button-label {
    display: none;
  }

  .quiet-button {
    width: 36px;
    height: 36px;
    justify-content: center;
    padding: 0;
  }

  .hero {
    padding: 50px 20px 55px;
  }

  .hero h1 {
    font-size: clamp(42px, 13vw, 62px);
  }

  .hero-visual {
    min-height: 430px;
  }

  .ui-card {
    width: 88%;
    height: 275px;
  }

  .terminal-card {
    width: 82%;
    height: 225px;
  }

  .route-badge {
    right: 0;
  }

  .course-intro {
    grid-template-columns: 1fr;
    padding: 22px 20px;
  }

  .course-intro > div,
  .course-intro > div + div {
    padding: 13px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .course-intro .intro-note {
    grid-column: auto;
    margin: 0;
    border: 0;
  }

  .course-shell {
    padding: 35px 14px 70px;
  }

  .course-sidebar {
    display: block;
  }

  .progress-card {
    margin-bottom: 13px;
  }

  .module-nav {
    display: flex;
    flex-direction: row;
    gap: 7px;
    overflow-x: auto;
    padding: 3px 0 10px;
    scrollbar-width: thin;
  }

  .module-nav a {
    display: flex;
    flex: 0 0 auto;
    gap: 7px;
    min-height: 38px;
    padding-inline: 12px;
    border: 1px solid var(--line);
    background: white;
  }

  .module-nav a i {
    margin-left: 3px;
  }

  .module {
    margin-bottom: 30px;
    padding: 28px 20px;
    border-radius: 22px;
  }

  .module-header h2 {
    font-size: clamp(35px, 11vw, 48px);
  }

  .objective-box {
    padding: 15px;
  }

  .split-content,
  .folder-rule {
    grid-template-columns: 1fr;
  }

  .mac-about-card,
  .folder-illustration {
    width: min(280px, 100%);
    margin: 0 auto;
  }

  .result-grid,
  .preflight-list,
  .safety-rules,
  .challenge-grid,
  .memo-grid,
  .approval-columns {
    grid-template-columns: 1fr;
  }

  .name-explainer {
    display: grid;
    grid-template-columns: 43px 1fr;
  }

  .explainer-arrow {
    grid-column: 1 / -1;
    transform: rotate(90deg);
  }

  .install-steps,
  .review-flow {
    grid-template-columns: 1fr;
  }

  .install-arrow,
  .review-flow > i {
    transform: rotate(90deg);
    text-align: center;
  }

  .step-picture {
    max-width: 250px;
    margin-inline: auto;
  }

  .ui-demo {
    grid-template-columns: 135px 1fr;
    min-height: 240px;
  }

  .demo-sidebar {
    padding: 10px;
  }

  .demo-switcher strong {
    display: none;
  }

  .demo-main {
    padding: 20px;
  }

  .permission-card {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .permission-status {
    margin-left: 62px;
  }

  .prompt-card blockquote {
    padding: 18px;
    font-size: 14px;
  }

  .approval-columns > div + div {
    border-top: 1px solid #cde7d8;
    border-left: 0;
  }

  .terminal-basics {
    grid-template-columns: 1fr;
  }

  .terminal-concept {
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: center;
  }

  .terminal-concept > span {
    grid-row: 1 / 3;
    margin: 0;
  }

  .prompt-formula {
    grid-template-columns: 1fr;
  }

  .prompt-formula > div {
    min-height: auto;
  }

  .prompt-formula > b {
    transform: rotate(45deg);
    text-align: center;
  }

  .module-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .next-module {
    align-self: flex-end;
  }

  .challenge-grid label {
    min-height: 62px;
  }

  .certificate label {
    flex-direction: column;
  }

  .memo-grid > div:nth-child(odd) {
    border-right: 0;
  }

  .site-footer {
    grid-template-columns: 1fr;
    padding-inline: 24px;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  :root {
    --paper: white;
  }

  .top-progress,
  .site-header,
  .hero-visual,
  .hero-actions,
  .course-sidebar,
  .next-module,
  .prompt-top button,
  .command-card button,
  .quiz-button,
  .certificate button,
  .site-footer,
  .toast {
    display: none !important;
  }

  .hero {
    display: block;
    min-height: auto;
    padding: 25px 0 40px;
  }

  .hero h1 {
    font-size: 48px;
  }

  .course-intro {
    display: none;
  }

  .course-shell {
    display: block;
    padding: 0;
  }

  .module,
  .final-challenge,
  .cheat-sheet {
    break-inside: avoid;
    margin: 0 0 24px;
    padding: 28px;
    border: 1px solid #aaa;
    box-shadow: none;
  }

  .module-header h2,
  .final-challenge h2,
  .troubleshooting h2 {
    font-size: 35px;
  }

  .certificate {
    display: block;
  }

  body.print-certificate .hero,
  body.print-certificate .course-intro,
  body.print-certificate .course-shell > *:not(.course-content),
  body.print-certificate .module,
  body.print-certificate .troubleshooting,
  body.print-certificate .cheat-sheet {
    display: none !important;
  }

  body.print-certificate .final-challenge {
    min-height: 80vh;
    display: grid;
    align-content: center;
  }

  body.print-certificate .final-challenge > *:not(.certificate) {
    display: none;
  }
}