:root{color-scheme:dark;--panel: rgba(15, 23, 42, .76);--panel-border: rgba(148, 163, 184, .16);--text: #e5eefb;--muted: #bfd0ea;--translation: #fcd34d;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html,body,#app{margin:0;min-height:100%}body{background:radial-gradient(circle at top,rgba(124,58,237,.28),transparent 28%),linear-gradient(180deg,#081120,#0f172a 48%,#111827);color:var(--text)}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit}button:hover{cursor:pointer}a{color:inherit;text-decoration:none}small{display:block;margin-top:4px;font-size:.8rem;line-height:1.45}.page-shell{width:min(100%,860px);margin:0 auto;padding:20px 16px 40px}.page-shell--deck{width:min(100%,720px)}.page-shell--practice{min-height:100dvh;padding-top:4px;padding-bottom:6px}.app-header,.deck-shell,.topic-card{backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}.app-header,.deck-shell{background:var(--panel);border:1px solid var(--panel-border);border-radius:24px;box-shadow:0 24px 80px #00000047}.app-header{padding:24px 18px}.app-header--compact{padding:18px 16px}.app-header-top,.topic-card-top,.topic-card-footer,.deck-status,.deck-nav,.top-actions,.card-section.two-col,.deck-toolbar,.deck-toolbar-actions{display:flex;justify-content:space-between;gap:12px}.app-header-top,.topic-card-top,.deck-status,.deck-toolbar{align-items:flex-start}.eyebrow{margin:0;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:#c4b5fd}.translate-toggle,.ghost-button,.nav-button{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;min-height:44px;padding:8px 14px;border-radius:16px;border:1px solid rgba(148,163,184,.18);background:#0f172aa8;color:var(--text)}.translate-toggle{min-width:116px}.translate-toggle small,.ghost-button small,.nav-button small,.topic-count small,.face-chip small,.hero-badges small,.deck-progress small,.card-footer-note small{color:var(--translation)}.app-header h1{margin:14px 0 0;font-size:clamp(1.9rem,6vw,3rem);line-height:1.05}.app-header--compact h1{margin-top:10px;font-size:clamp(1.45rem,5vw,2rem)}.header-copy{margin:12px 0 0;font-size:1rem;line-height:1.55;color:var(--muted)}.app-header--compact .header-copy,.app-header--compact .header-translation{font-size:.92rem}.header-translation,.inline-translation,.card-translation,.section-translation{margin:6px 0 0;color:var(--translation);line-height:1.55}.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.app-header--compact .hero-badges{margin-top:12px}.hero-badges span,.topic-count,.face-chip,.deck-progress{display:inline-flex;flex-direction:column;align-items:flex-start;padding:8px 12px;border-radius:16px;background:#94a3b81a;color:#dbeafe;font-size:.86rem}.app-header--compact .hero-badges span,.app-header--compact .deck-progress{padding:6px 10px;font-size:.8rem}.topic-grid{display:grid;gap:14px;margin-top:18px}.topic-card{display:block;padding:18px;background:linear-gradient(180deg,#0f172acc,#1e293bbf);border:1px solid rgba(148,163,184,.16);border-radius:22px;transition:transform .2s ease,border-color .2s ease}.topic-card:active,.topic-card:hover{transform:translateY(-2px);border-color:#a78bfa70}.topic-emoji{font-size:1.8rem}.topic-card h2{margin:14px 0 0;font-size:1.25rem}.topic-card p{margin:8px 0 0;color:var(--muted);line-height:1.55}.topic-card-footer{margin-top:16px;font-size:.92rem;color:#ddd6fe}.ghost-button--stacked,.nav-button--stacked{align-items:center}.nav-button.primary{background:linear-gradient(135deg,#7c3aed,#2563eb);border-color:transparent}.top-actions{margin-bottom:12px}.deck-shell{margin-top:14px;padding:14px}.deck-shell--practice{display:flex;flex-direction:column;min-height:calc(100dvh - 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