:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #06162f;
  color: #eef7ff;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 0%, #174a73 0, transparent 36rem), #06162f;
}

.commerce-shell {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.commerce-card {
  padding: clamp(24px, 5vw, 44px);
  border: 1px solid rgba(80, 232, 255, .42);
  border-radius: 24px;
  background: rgba(8, 35, 70, .93);
  box-shadow: 0 28px 80px rgba(0, 0, 0, .3);
}

h1, h2 { margin-top: 0; line-height: 1.15; }
p { line-height: 1.6; color: #cbdbea; }
a { color: #65efff; }
.muted { color: #9eb4c8; }
.price { font-size: clamp(30px, 7vw, 48px); font-weight: 750; color: #63efff; }
.stack { display: grid; gap: 18px; }
.commerce-card.stack { grid-template-columns: minmax(0, 1fr); }
.commerce-card.stack > *,
#lessons,
.lesson,
.lesson-resources,
.lesson-resource { min-width: 0; }
label { display: grid; gap: 8px; }
input[type="email"] {
  width: 100%; padding: 14px 16px; border: 1px solid #4f7899; border-radius: 12px;
  background: #05152a; color: #fff; font: inherit;
}
.check { grid-template-columns: auto 1fr; align-items: start; }
button, .button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 50px;
  border: 0; border-radius: 14px; padding: 12px 20px; cursor: pointer;
  background: linear-gradient(135deg, #36e3ff, #34b6f0); color: #03203d;
  font: inherit; font-weight: 750; text-decoration: none;
}
button[disabled] { opacity: .55; cursor: wait; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.error { color: #ffb7b7; }
.success { color: #8fffd8; }
.preview-panel { padding: 18px; border: 1px solid #65efff; border-radius: 14px; background: rgba(25, 84, 113, .35); }
.preview-panel p { margin: 0; }
#preview-code { font-size: 28px; letter-spacing: .15em; color: #8fffd8; }
.lesson { padding: 18px 0; border-top: 1px solid rgba(255, 255, 255, .12); }
.lesson-description { margin-top: -8px; }
.lesson-resources { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; margin-top: 20px; }
.lesson-resource { padding: 16px; border: 1px solid rgba(101, 239, 255, .2); border-radius: 14px; background: rgba(3, 18, 39, .55); }
.lesson-resource h3 { margin: 0 0 10px; }
.lesson-resource pre { max-width: 100%; overflow-x: auto; margin: 0; padding: 14px; border-radius: 10px; background: #020b18; color: #dffbff; white-space: pre; }
.lesson-resource code { display: block; width: max-content; min-width: 100%; }
.lesson-resource__text { margin: 0; white-space: pre-wrap; }
.lesson-resource button { min-height: 38px; margin-top: 12px; padding: 8px 14px; }
.lesson-resource--compact { padding: 0; border: 0; border-radius: 0; background: none; }
.lesson-resource--compact h3 { margin: 0 0 7px; font-size: .875rem; font-weight: 550; line-height: 1.45; color: #cbdbea; }
.lesson-resource--note { margin-bottom: 3px; }
.lesson-resource--note h3 { font-size: 1rem; font-weight: 650; color: #eef7ff; }
.lesson-resource--note p { font-size: .875rem; }
.resource-codebox { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 44px; align-items: start; min-width: 0; border: 1px solid rgba(158, 180, 200, .16); border-radius: 10px; background: #020b18; }
.lesson-resource--compact pre { min-width: 0; padding: 12px; font-size: .8125rem; line-height: 1.55; background: none; }
.lesson-resource--compact .resource-copy { position: relative; width: 44px; height: 44px; min-height: 44px; margin: 0; padding: 0; border-radius: 8px; background: none; color: #9eb4c8; font-size: 17px; font-weight: 500; }
.resource-copy::before, .resource-copy::after { content: ""; position: absolute; width: 11px; height: 13px; border: 1.5px solid currentColor; border-radius: 3px; }
.resource-copy::before { transform: translate(-2px, 2px); }
.resource-copy::after { transform: translate(2px, -2px); background: #020b18; }
.resource-copy[data-copy-state="copied"]::before, .resource-copy[data-copy-state="error"]::before { content: "✓"; width: auto; height: auto; border: 0; transform: none; color: #8fffd8; }
.resource-copy[data-copy-state="error"]::before { content: "!"; color: #ffb7b7; }
.resource-copy[data-copy-state]::after { display: none; }
.resource-copy[data-copy-state=""]::after { display: block; }
.lesson-resource--compact .resource-copy:hover { color: #eef7ff; background: rgba(158, 180, 200, .1); }
.lesson-resource--compact .resource-copy:focus-visible { outline: 2px solid #65efff; outline-offset: -3px; }
.lesson-resource--compact .resource-copy[disabled] { opacity: 1; cursor: default; }
.resource-copy-status { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.lesson--codex .lesson-resource { overflow-wrap: anywhere; }
.lesson--codex .lesson-resource pre { white-space: pre-wrap; }
.lesson--codex .lesson-resource code { width: auto; min-width: 0; white-space: inherit; }
.lesson--codex .lesson-resource--info { padding: 16px; border: 1px solid rgba(101, 239, 255, .38); border-left: 3px solid #65efff; border-radius: 10px; background: rgba(25, 84, 113, .3); }
.lesson--codex .lesson-resource--info h3 { color: #b9f4ff; }
.lesson--final .lesson-resource { overflow-wrap: anywhere; }
.lesson--final .lesson-resource pre { white-space: pre-wrap; }
.lesson--final .lesson-resource code { width: auto; min-width: 0; white-space: inherit; }
.lesson--final .lesson-resource--info { margin: 18px 0; padding: 16px; border: 1px solid rgba(101, 239, 255, .38); border-left: 3px solid #65efff; border-radius: 10px; background: rgba(25, 84, 113, .3); }
.lesson--final .lesson-resource--info h3 { color: #b9f4ff; }
.lesson--final .resource-copy-status { top: 0; right: 48px; width: auto; height: auto; max-width: calc(100% - 60px); clip-path: none; padding: 6px 8px; border-radius: 6px; background: #020b18; color: #8fffd8; font-size: .75rem; white-space: normal; }
.lesson--final .resource-copy-status:empty { display: none; }
video { width: 100%; border-radius: 14px; background: #000; }

@media (max-width: 520px) {
  .commerce-shell { width: min(100% - 20px, 760px); padding-top: 20px; }
  .commerce-card { border-radius: 18px; padding: 22px 18px; }
  .actions > * { width: 100%; }
}