.chapter-countdown{--countdown-border:#555;--countdown-text:#eee;--countdown-highlight:#052d49;--countdown-shadow:rgba(0, 0, 0, 0.5);--countdown-bg:rgba(255, 255, 255, 0.6);padding:25px;border:2px solid var(--countdown-border);border-radius:12px;text-align:center;max-width:450px;margin:30px auto;box-shadow:0 6px 12px var(--countdown-shadow);will-change:transform,opacity;transform:translateY(20px) translateZ(0);opacity:0;transition:opacity 0.5s ease-in,transform 0.5s ease;display:none}:root[data-mode="light"] .chapter-countdown,.chapter-countdown[data-mode="light"]{--countdown-border:#ddd;--countdown-text:#052d49;--countdown-shadow:rgba(0, 0, 0, 0.1)}.chapter-countdown.show{display:block;opacity:1;transform:translateY(0) translateZ(0)}.countdown-title{font-size:1.4em;font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;color:var(--countdown-text);margin:0;font-weight:400}.countdown-timer{display:inline-block;font-weight:700;color:var(--countdown-highlight);padding:5px 10px;border-radius:8px;background:var(--countdown-bg);box-shadow:inset 0 0 8px rgb(0 0 0 / .1);margin-left:.5em;min-width:120px;text-align:center}@media (max-width:480px){.chapter-countdown{padding:20px;font-size:.95em;margin:20px 10px}.countdown-title{font-size:1.2em}.countdown-timer{display:block;margin:10px auto 0;min-width:auto}}@media (prefers-reduced-motion:reduce){.chapter-countdown{transition:opacity 0.3s ease;transform:none}.chapter-countdown.show{transform:none}}@media (prefers-contrast:high){.chapter-countdown{--countdown-border:#000;--countdown-text:#000;--countdown-highlight:#000;border-width:3px}}