:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--c-bg: #0a0a0a;--c-surface: #141414;--c-surface-hover: #1a1a1a;--c-border: rgba(255, 255, 255, .08);--c-border-active: rgba(99, 179, 237, .4);--c-accent: #3b82f6;--c-accent-glow: rgba(59, 130, 246, .15);--c-success: #22c55e;--c-text: #fafafa;--c-text-muted: rgba(255, 255, 255, .55);--c-text-secondary: rgba(255, 255, 255, .7);--radius: .75rem;--radius-sm: .5rem}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:var(--c-bg);color:var(--c-text)}.header{position:sticky;top:0;z-index:50;background:#0a0a0ad9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--c-border)}.header__inner{max-width:72rem;margin:0 auto;padding:.85rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}.header__brand{display:flex;align-items:center;gap:.6rem}.header__logo{font-size:1.6rem}.header__title{margin:0;font-size:1.15rem;font-weight:700;letter-spacing:-.02em}.header__stats{display:flex;align-items:center;gap:.75rem}.header__progress-wrap{display:flex;align-items:center;gap:.6rem}.header__stat-text{font-size:.78rem;color:var(--c-text-muted);white-space:nowrap}.hero{max-width:72rem;margin:0 auto;padding:3rem 1.5rem 1.5rem;text-align:center}.hero__title{margin:0 0 .5rem;font-size:2rem;font-weight:700;letter-spacing:-.03em;background:linear-gradient(135deg,#fff 30%,var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero__subtitle{margin:0 auto;max-width:36rem;font-size:1rem;color:var(--c-text-secondary)}.main{max-width:72rem;margin:0 auto;padding-bottom:3rem}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(17rem,1fr));gap:1rem;padding:0 1.5rem}.vehicle-card{display:flex;align-items:flex-start;gap:1rem;padding:1.1rem;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);cursor:pointer;transition:border-color .2s,background .2s,box-shadow .2s;text-align:left;font:inherit;color:inherit;width:100%}.vehicle-card:hover{background:var(--c-surface-hover);border-color:#ffffff24}.vehicle-card--selected{border-color:var(--c-border-active);box-shadow:0 0 0 1px var(--c-border-active),0 0 20px var(--c-accent-glow);background:#3b82f60a}.vehicle-card__icon{font-size:2rem;flex-shrink:0;line-height:1;padding-top:.15rem}.vehicle-card__info{flex:1;min-width:0}.vehicle-card__name{margin:0 0 .25rem;font-size:1rem;font-weight:600}.vehicle-card__desc{margin:0 0 .65rem;font-size:.82rem;color:var(--c-text-muted);line-height:1.45}.vehicle-card__progress{display:flex;align-items:center;gap:.5rem}.progress-bar{flex:1;height:5px;background:#ffffff14;border-radius:3px;overflow:hidden}.progress-bar--header{width:120px;height:5px}.progress-bar__fill{height:100%;background:var(--c-accent);border-radius:3px;transition:width .4s ease}.progress-bar__text{font-size:.72rem;color:var(--c-text-muted);white-space:nowrap}.lesson-panel{margin:1.5rem 1.5rem 0;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.lesson-panel__header{display:flex;align-items:center;gap:1rem;padding:1.25rem 1.5rem;border-bottom:1px solid var(--c-border);background:#ffffff04}.lesson-panel__icon{font-size:2.2rem}.lesson-panel__title{margin:0;font-size:1.3rem;font-weight:700}.lesson-panel__subtitle{margin:.15rem 0 0;font-size:.85rem;color:var(--c-text-muted)}.lesson-panel__body{display:grid;grid-template-columns:14rem 1fr;min-height:20rem}.lesson-nav{border-right:1px solid var(--c-border);padding:.5rem;display:flex;flex-direction:column;gap:.25rem}.lesson-nav__item{display:flex;align-items:center;gap:.65rem;padding:.6rem .75rem;background:transparent;border:none;border-radius:var(--radius-sm);cursor:pointer;font:inherit;color:var(--c-text-secondary);font-size:.82rem;text-align:left;transition:background .15s,color .15s;width:100%}.lesson-nav__item:hover{background:#ffffff0a;color:var(--c-text)}.lesson-nav__item--active{background:#3b82f61a;color:var(--c-text)}.lesson-nav__item--done{color:var(--c-success)}.lesson-nav__num{display:inline-flex;align-items:center;justify-content:center;width:1.5rem;height:1.5rem;border-radius:50%;background:#ffffff0f;font-size:.72rem;font-weight:600;flex-shrink:0}.lesson-nav__item--done .lesson-nav__num{background:#22c55e26}.lesson-nav__label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lesson-content{padding:1.75rem 2rem}.lesson-content__title{margin:0 0 .75rem;font-size:1.15rem;font-weight:700}.lesson-content__text{margin:0 0 1.5rem;font-size:.92rem;color:var(--c-text-secondary);line-height:1.65}.tips-box{background:#3b82f60f;border:1px solid rgba(59,130,246,.12);border-radius:var(--radius-sm);padding:1rem 1.25rem;margin-bottom:1.5rem}.tips-box__heading{margin:0 0 .5rem;font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--c-accent)}.tips-box__list{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:.4rem}.tips-box__item{font-size:.85rem;color:var(--c-text-secondary);padding-left:1.2rem;position:relative;line-height:1.5}.tips-box__item:before{content:"▸";position:absolute;left:0;color:var(--c-accent)}.btn-complete{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.25rem;background:var(--c-accent);color:#fff;border:none;border-radius:var(--radius-sm);font:inherit;font-size:.85rem;font-weight:600;cursor:pointer;transition:background .15s,transform .1s}.btn-complete:hover{background:#2563eb}.btn-complete:active{transform:scale(.97)}.btn-complete--done{background:transparent;border:1px solid rgba(34,197,94,.3);color:var(--c-success)}.btn-complete--done:hover{background:#22c55e14}.footer{max-width:72rem;margin:0 auto;padding:1.5rem;text-align:center;border-top:1px solid var(--c-border);color:var(--c-text-muted);font-size:.78rem}@media(max-width:768px){.hero__title{font-size:1.5rem}.grid,.lesson-panel__body{grid-template-columns:1fr}.lesson-nav{border-right:none;border-bottom:1px solid var(--c-border);flex-direction:row;overflow-x:auto;padding:.5rem}.lesson-nav__item{white-space:nowrap}.lesson-content{padding:1.25rem}}@media(max-width:480px){.header__inner{flex-direction:column;align-items:flex-start}.header__progress-wrap{width:100%}.progress-bar--header{flex:1;width:auto}.hero{padding:2rem 1rem 1rem}.grid{padding:0 1rem}.lesson-panel{margin:1rem 1rem 0}}