/* Program selection shares the platform palette and keeps its own page layout. */
.challenge-page {
  --bg: var(--gc-background, #050505);
  --panel: var(--gc-surface, #111114);
  --panel-raised: var(--gc-surface-raised, #17171b);
  --text: var(--gc-text, #f6f6f8);
  --muted: var(--gc-text-secondary, #8e8e95);
  --accent: var(--gc-accent, #b6ff45);
  --line: var(--gc-border, rgba(255, 255, 255, .08));
  --challenge-ink: #101608;
  --challenge-hover: #c7ff76;
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--gc-font-sans);
  -webkit-font-smoothing: antialiased;
  color-scheme: dark;
}
html { scroll-behavior: smooth; scroll-padding-top: 112px; }
.challenge-page *, .challenge-page *::before, .challenge-page *::after { box-sizing: border-box; }
.challenge-page button, .challenge-page input, .challenge-page a { -webkit-tap-highlight-color: transparent; }
.challenge-page button, .challenge-page input { font: inherit; }
.challenge-page button, .challenge-page a { touch-action: manipulation; }
.challenge-page a { color: inherit; text-decoration: none; }
.challenge-page button { cursor: pointer; }
.challenge-page :focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.challenge-page [hidden] { display: none !important; }
.challenge-visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.challenge-skip { position: fixed; z-index: 100; top: 12px; left: 12px; transform: translateY(-180%); padding: 14px 20px; background: var(--accent); color: var(--challenge-ink) !important; border-radius: 10px; }
.challenge-skip:focus { transform: translateY(0); }
.challenge-container { width: min(1240px, calc(100% - 80px)); margin-inline: auto; }

.challenge-header { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }
.challenge-header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.challenge-brand { display: inline-flex; align-items: center; flex-shrink: 0; gap: 10px; font-size: 23px; font-weight: 680; letter-spacing: -.9px; }
.challenge-brand img { width: 31px; height: 31px; }
.challenge-nav { display: flex; gap: 30px; color: var(--muted); font-size: 12px; }
.challenge-nav a { position: relative; padding: 31px 0; transition: color .18s; }
.challenge-nav a:hover, .challenge-nav a[aria-current] { color: var(--text); }
.challenge-nav a[aria-current]::after { position: absolute; content: ""; height: 2px; background: var(--accent); inset: auto 0 -1px; }
.challenge-controls { display: flex; align-items: center; gap: 9px; }
.challenge-controls button { min-width: 40px; min-height: 44px; padding: 8px; border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--muted); font-size: 13px; transition: color .18s, background .18s; }
.challenge-controls button:hover { color: var(--text); background: var(--panel-raised); }
.challenge-login { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; border: 1px solid var(--line); background: var(--panel); border-radius: 10px; padding: 11px 17px; font-size: 12px; transition: background .18s, border-color .18s; }
.challenge-login:hover { background: var(--panel-raised); border-color: color-mix(in srgb, var(--text) 24%, transparent); }

.challenge-intro { position: relative; isolation: isolate; display: grid; justify-items: center; gap: 28px; padding-block: 64px 38px; text-align: center; }
.challenge-intro::before { content: ""; position: absolute; pointer-events: none; z-index: -1; top: 0; left: 50%; transform: translateX(-50%); width: min(100%, 800px); height: 300px; background: radial-gradient(ellipse at 50% 0, color-mix(in srgb, var(--accent) 5%, transparent), transparent 70%); }
.challenge-eyebrow { display: flex; align-items: center; justify-content: center; gap: 10px; margin: 0 0 23px; color: var(--muted); font-size: 10px; font-weight: 600; letter-spacing: 2.1px; text-transform: uppercase; }
.challenge-eyebrow::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 28%, transparent); }
.challenge-intro h1 { margin: 0 0 23px; font-size: clamp(36px, 4.7vw, 64px); line-height: 1.06; letter-spacing: -.055em; font-weight: 550; }
.challenge-intro h1 span { color: var(--muted); }
.challenge-intro p:not(.challenge-eyebrow) { max-width: 610px; margin: 0 auto; color: var(--muted); font-size: 14px; line-height: 1.85; text-wrap: pretty; }
.challenge-steps { display: flex; align-items: center; gap: 23px; list-style: none; padding: 0; margin: 0; font-size: 11px; color: var(--muted); }
.challenge-steps li { display: flex; align-items: center; gap: 9px; }
.challenge-steps li + li::before { content: ""; width: 27px; height: 1px; background: var(--line); margin-right: 14px; }
.challenge-steps span { display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid var(--line); border-radius: 50%; font-size: 9px; font-variant-numeric: tabular-nums; }
.challenge-steps [aria-current] { color: var(--text); }
.challenge-steps [aria-current] span { color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--bg)); border-color: color-mix(in srgb, var(--accent) 26%, transparent); }
.challenge-demo { display: flex; align-items: flex-start; gap: 12px; padding: 15px 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); margin-bottom: 20px; color: var(--muted); font-size: 11px; line-height: 1.8; }
.challenge-demo svg { flex-shrink: 0; margin-top: 2px; color: var(--muted); }
.challenge-demo strong { color: var(--text); font-weight: 550; }
.challenge-demo a, .challenge-rule-note a { color: var(--text); text-decoration: underline; text-decoration-color: var(--muted); text-underline-offset: 4px; }
.challenge-demo a:hover, .challenge-rule-note a:hover { text-decoration-color: var(--accent); }

.challenge-layout { display: grid; grid-template-columns: minmax(0, 1fr) 352px; align-items: start; gap: 24px; padding-bottom: 76px; animation-delay: .07s; }
.challenge-panel { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: var(--panel); }
.challenge-selection { grid-column: 1; grid-row: 1; }
.challenge-panel-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 20px; }
.challenge-section-label { display: flex; align-items: baseline; gap: 12px; margin: 0; font-size: 16px; font-weight: 550; letter-spacing: -.35px; line-height: 1.5; }
.challenge-number { flex-shrink: 0; color: var(--muted); font-size: 10px; font-weight: 400; letter-spacing: 1px; }
.challenge-tag { border: 1px solid var(--line); border-radius: 5px; padding: 5px 7px; color: var(--muted); font-size: 8px; letter-spacing: 1px; white-space: nowrap; }
.challenge-fieldset { min-width: 0; border: 0; padding: 0; margin: 0; }
.challenge-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.challenge-choice { position: relative; display: block; min-width: 0; min-height: 133px; padding: 39px 15px 17px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-raised); cursor: pointer; transition: background .2s, border-color .2s, transform .2s; }
.challenge-choice:hover { border-color: color-mix(in srgb, var(--text) 28%, transparent); transform: translateY(-2px); }
.challenge-choice:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 5%, var(--panel)); }
.challenge-choice:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 4px; }
.challenge-choice input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.challenge-radio { position: absolute; top: 14px; right: 14px; width: 13px; height: 13px; border: 1px solid color-mix(in srgb, var(--muted) 65%, transparent); border-radius: 50%; }
.challenge-choice input:checked + .challenge-radio { border: 4px solid var(--accent); background: var(--panel); }
.challenge-size { display: block; margin-bottom: 13px; color: var(--text); font-size: clamp(25px, 2.3vw, 32px); line-height: 1; font-weight: 550; letter-spacing: -.055em; font-variant-numeric: tabular-nums; }
.challenge-cost { display: block; color: var(--muted); font-size: 10px; line-height: 1.6; }
.challenge-choice:has(input:checked) .challenge-size { color: var(--accent); }
.challenge-help { margin: 17px 0 0; color: var(--muted); font-size: 10px; line-height: 1.8; }
.challenge-divider { height: 1px; background: var(--line); margin: 29px 0; }
.challenge-rule-list { margin: 22px 0 0; }
.challenge-rule { padding: 18px 0; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px; border-bottom: 1px solid var(--line); }
.challenge-rule:first-child { padding-top: 0; }
.challenge-rule:last-child { padding-bottom: 0; border: 0; }
.challenge-rule dt { color: var(--text); font-size: 12px; }
.challenge-rule dt small { display: block; margin-top: 5px; color: var(--muted); font-size: 10px; line-height: 1.8; }
.challenge-rule dd { margin: 0; text-align: right; font-size: 17px; font-variant-numeric: tabular-nums; font-weight: 500; }
.challenge-rule dd small { display: block; margin-top: 7px; color: var(--muted); font-size: 10px; font-weight: 400; }
.challenge-rule:first-child dd { color: var(--accent); }
.challenge-rule-note { border-top: 1px solid var(--line); margin: 22px 0 0; padding-top: 18px; font-size: 10px; color: var(--muted); line-height: 1.8; }

.challenge-summary { position: sticky; top: 106px; grid-column: 2; grid-row: 1 / span 2; overflow: hidden; padding: 28px; background: linear-gradient(155deg, color-mix(in srgb, var(--accent) 4%, var(--panel)) 0%, var(--panel) 37%); }
.challenge-summary::before { content: ""; position: absolute; inset: 0 32px auto; height: 1px; background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 50%, transparent), transparent); }
.challenge-summary-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 34px; }
.challenge-summary h2 { margin: 0; font-size: 13px; font-weight: 550; }
.challenge-summary-code { color: var(--muted); font: 8px "SFMono-Regular", Consolas, monospace; letter-spacing: 1.1px; }
.challenge-account-label { color: var(--muted); font-size: 11px; margin-bottom: 11px; }
.challenge-account-value { display: block; font-size: clamp(39px, 3.6vw, 51px); letter-spacing: -.065em; line-height: 1.1; font-weight: 550; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.challenge-account-name { margin-top: 12px; color: var(--muted); font-size: 11px; line-height: 1.6; }
.challenge-summary-line { display: flex; justify-content: space-between; align-items: baseline; gap: 14px; margin-top: 17px; color: var(--muted); font-size: 11px; line-height: 1.65; }
.challenge-summary-line strong { color: var(--text); font-weight: 500; text-align: right; }
.challenge-summary .challenge-divider { margin: 25px 0; }
.challenge-total { display: flex; justify-content: space-between; align-items: center; gap: 14px; font-size: 12px; }
.challenge-total strong { font-size: 35px; font-weight: 550; letter-spacing: -.045em; font-variant-numeric: tabular-nums; }
.challenge-usd { margin: 7px 0 25px; text-align: right; color: var(--muted); font-size: 10px; line-height: 1.7; }
.challenge-continue { display: flex; width: 100%; min-height: 54px; justify-content: space-between; align-items: center; gap: 12px; padding: 16px 19px; border: 1px solid var(--accent); border-radius: 12px; background: var(--accent); color: var(--challenge-ink) !important; font-size: 12px; line-height: 1.6; font-weight: 650; transition: background .2s, transform .2s, box-shadow .2s; }
.challenge-continue > span:last-child { font-size: 19px; line-height: 1; }
.challenge-continue:hover { background: var(--challenge-hover); transform: translateY(-2px); box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 11%, transparent); }
.challenge-continue[aria-disabled="true"] { opacity: .45; pointer-events: none; }
.challenge-summary-note { font-size: 10px; line-height: 1.9; text-align: center; margin: 15px 0 0; color: var(--muted); }

.challenge-faq { grid-column: 1; grid-row: 2; padding: 14px 4px 0; }
.challenge-faq h2 { margin: 0 0 10px; color: var(--text); font-size: 17px; letter-spacing: -.4px; font-weight: 550; }
.challenge-faq details { border-bottom: 1px solid var(--line); }
.challenge-faq summary { position: relative; display: flex; align-items: center; min-height: 58px; cursor: pointer; padding: 17px 38px 17px 0; font-size: 12px; line-height: 1.7; list-style: none; color: var(--muted); transition: color .2s; }
.challenge-faq summary:hover, .challenge-faq details[open] summary { color: var(--text); }
.challenge-faq summary::-webkit-details-marker { display: none; }
.challenge-faq summary::after { content: "+"; position: absolute; right: 3px; width: 23px; height: 23px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; font-size: 16px; line-height: 1; color: var(--muted); }
.challenge-faq details[open] summary::after { content: "−"; color: var(--accent); }
.challenge-faq p { margin: 0 35px 20px 0; color: var(--muted); font-size: 11px; line-height: 1.9; }
.challenge-load-state { border: 1px dashed var(--line); border-radius: 12px; padding: 32px 18px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.challenge-retry { display: block; min-height: 44px; margin-top: 12px; padding: 10px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-raised); color: var(--text); font-size: 12px; }
.challenge-footer { border-top: 1px solid var(--line); padding: 30px 0; }
.challenge-footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); font-size: 10px; line-height: 1.8; }
.challenge-footer a:hover { color: var(--text); }
.challenge-arrive { animation: challenge-arrive .5s ease-out both; }
@keyframes challenge-arrive { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

html[data-theme="light"] .challenge-page {
  --bg: var(--gc-background, #f5f5f7);
  --panel: var(--gc-surface, #ffffff);
  --panel-raised: var(--gc-surface-raised, #f0f0f3);
  --text: var(--gc-text, #18181b);
  --muted: var(--gc-text-secondary, #676771);
  --accent: var(--gc-accent, #426c05);
  --line: var(--gc-border, rgba(24, 24, 27, .10));
  --challenge-ink: #ffffff;
  --challenge-hover: #355705;
  color-scheme: light;
}
html[data-theme="light"] .challenge-summary { background: linear-gradient(155deg, #f2f6e9, var(--panel) 48%); }
@media (max-width: 1120px) {
  .challenge-container { width: calc(100% - 48px); }
  .challenge-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 20px; }
  .challenge-panel { padding: 24px; }
  .challenge-nav { gap: 22px; }
  .challenge-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .challenge-choice { min-height: 121px; padding-top: 32px; }
  .challenge-size { font-size: 31px; }
  .challenge-tag { display: none; }
}
@media (max-width: 880px) {
  .challenge-nav { display: none; }
  .challenge-layout { grid-template-columns: minmax(0, 1fr) 290px; gap: 16px; }
  .challenge-panel { padding: 20px; border-radius: 16px; }
  .challenge-summary-code { font-size: 7px; }
  .challenge-summary-top { gap: 8px; }
  .challenge-intro { padding-top: 48px; }
  .challenge-section-label { font-size: 14px; gap: 9px; }
  .challenge-summary .purchase-option { grid-template-columns: 17px minmax(0, 1fr); }
  .challenge-summary .purchase-option b { grid-column: 2; }
}
@media (max-width: 720px) {
  .challenge-container { width: calc(100% - 36px); }
  .challenge-header-inner { min-height: 70px; gap: 15px; }
  .challenge-brand { font-size: 20px; }
  .challenge-brand img { width: 28px; height: 28px; }
  .challenge-layout { grid-template-columns: minmax(0, 1fr); gap: 18px; padding-bottom: 44px; }
  .challenge-selection { grid-column: 1; grid-row: 1; }
  .challenge-summary { position: static; grid-column: 1; grid-row: 2; padding: 26px; }
  .challenge-summary-code { font-size: 8px; }
  .challenge-summary .purchase-option { grid-template-columns: 17px minmax(0, 1fr) auto; }
  .challenge-summary .purchase-option b { grid-column: auto; }
  .challenge-faq { grid-row: 3; padding-top: 18px; }
  .challenge-intro { gap: 24px; padding-block: 39px 28px; }
  .challenge-intro h1 { font-size: clamp(33px, 7vw, 48px); }
  .challenge-intro p:not(.challenge-eyebrow) { font-size: 12px; max-width: 430px; }
  .challenge-eyebrow { font-size: 9px; margin-bottom: 21px; }
  .challenge-demo { padding: 14px 16px; margin-bottom: 17px; font-size: 10px; }
  .challenge-steps { gap: 12px; font-size: 10px; }
  .challenge-steps li { gap: 6px; }
  .challenge-steps li + li::before { width: 13px; margin-right: 5px; }
  .challenge-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .challenge-choice { min-height: 118px; padding-inline: 14px; }
  .challenge-size { font-size: clamp(26px, 5vw, 33px); }
  .challenge-account-value { font-size: 51px; }
  .challenge-footer-inner { flex-direction: column; align-items: flex-start; gap: 13px; }
}
@media (max-width: 440px) {
  .challenge-container { width: calc(100% - 28px); }
  .challenge-header-inner { flex-wrap: wrap; justify-content: space-between; gap: 4px 12px; padding-block: 12px; }
  .challenge-brand { font-size: 19px; gap: 8px; }
  .challenge-controls { gap: 2px; }
  .challenge-controls button { min-width: 34px; padding: 5px; }
  .challenge-login { padding: 10px; font-size: 10px; }
  .challenge-panel { padding: 18px; }
  .challenge-summary { padding: 24px; }
  .challenge-intro h1 { font-size: clamp(31px, 8.3vw, 37px); letter-spacing: -.058em; }
  .challenge-steps { gap: 9px; font-size: 9px; }
  .challenge-steps span { width: 23px; height: 23px; font-size: 8px; }
  .challenge-steps li + li::before { display: none; }
  .challenge-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
  .challenge-size { font-size: 31px; }
  .challenge-cost { font-size: 9px; }
  .challenge-section-label { font-size: 14px; }
  .challenge-faq summary { font-size: 11px; }
  .challenge-rule { gap: 13px; }
  .challenge-rule dd { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .challenge-page *, .challenge-page *::before, .challenge-page *::after { animation: none !important; transition: none !important; }
}
/* Calm catalogue aligned with the shared workspace. */
.challenge-page .challenge-intro{padding-block:64px 40px;gap:30px;}
.challenge-page .challenge-intro h1{font-weight:550;letter-spacing:-.055em;}
.challenge-page .challenge-panel{border-radius:20px;border-color:var(--line);box-shadow:0 12px 50px -36px #0008;}
.challenge-page .challenge-help,.challenge-page .challenge-cost,.challenge-page .challenge-rule-note,.challenge-page .challenge-summary-note,.challenge-page .challenge-usd{font-size:12px;line-height:1.75;}
.challenge-page .challenge-section-label{font-size:16px;font-weight:600;letter-spacing:-.02em;}
.challenge-page .challenge-summary h2{font-size:19px;font-weight:600;letter-spacing:-.03em;}
.challenge-page .challenge-account-value{font-weight:550;letter-spacing:-.05em;}
.challenge-page .challenge-number{font-weight:400;color:var(--muted);font-size:12px;}
.challenge-page .challenge-continue{border-radius:11px;font-weight:650;box-shadow:none;}
.challenge-page .challenge-demo{border:1px solid var(--line);background:var(--panel);border-radius:12px;font-size:12px;}
.challenge-page .challenge-rule dt small{font-size:11px;line-height:1.6;}
@media(max-width:767px){.challenge-page .challenge-intro{padding-block:40px 28px;}.challenge-page .challenge-panel{border-radius:16px;}.challenge-page .challenge-steps{font-size:11px;gap:16px;}}
.challenge-page .challenge-intro{padding-block:42px 30px;gap:22px;}
.challenge-page .challenge-intro h1{font-size:clamp(32px,4vw,50px);margin-bottom:14px;}
.challenge-page .challenge-intro p:not(.challenge-eyebrow){font-size:14px;}
@media(max-width:767px){.challenge-page .challenge-intro{padding-block:32px 24px;gap:20px;}.challenge-page .challenge-intro h1{font-size:34px;}}