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solid var(--border-subtle);border-radius:var(--radius-md);background:rgba(4,10,8,.34)}.breakdown-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.breakdown-word{margin:0;color:var(--accent-green);font-weight:700;font-size:1.04rem}.breakdown-meaning{margin:8px 0 0;color:var(--text-primary);font-weight:600}.breakdown-note{margin:8px 0 0;color:var(--text-secondary);line-height:1.65}.english-original{border-color:rgba(120,160,255,.14);background:linear-gradient(135deg,rgba(120,160,255,.06),transparent 34%),var(--bg-card)}.english-text{margin:12px 0 0;font-size:1.3rem;font-weight:600;line-height:1.4;color:rgba(200,215,255,.9)}.cultural-note{border-color:rgba(255,215,0,.16);background:linear-gradient(135deg,rgba(255,215,0,.08),transparent 34%),var(--bg-card)}.skeleton-card{display:flex;flex-direction:column;gap:14px}.skeleton-block,.skeleton-chip,.skeleton-line{border-radius:999px;background:linear-gradient(90deg,rgba(255,255,255,.06),rgba(255,255,255,.12) 50%,rgba(255,255,255,.06));background-size:200% 100%;animation:pulse 1.35s ease-in-out infinite}.skeleton-line{height:14px}.skeleton-line-wide{width:72%}.skeleton-line-small{width:42%}.skeleton-grid{display:flex;gap:10px}.skeleton-chip{width:88px;height:30px}.skeleton-block{width:100%;height:160px;border-radius:var(--radius-md)}.audio-button{min-width:110px}.audio-wave{display:inline-flex;align-items:flex-end;gap:3px;min-width:18px;height:16px}.audio-wave-inline{justify-content:center}.audio-bar{display:inline-block;width:4px;border-radius:999px;background:currentColor;animation:audioWave .95s ease-in-out infinite}.audio-bar:first-child{height:7px;animation-delay:0s}.audio-bar:nth-child(2){height:14px;animation-delay:.16s}.audio-bar:nth-child(3){height:10px;animation-delay:.32s}.navbar-shell{position:fixed;top:0;left:0;right:0;z-index:50;padding:12px 16px 0}.navbar{position:relative;width:min(100%,var(--navbar-width));margin:0 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var(--transition-base),background var(--transition-base),color var(--transition-base)}.nav-link.is-active{background:var(--accent-green-dim);color:var(--accent-green)}.filter-row{display:flex;flex-wrap:wrap;gap:10px}.filter-chip{padding:10px 16px;background:rgba(255,255,255,.04);color:var(--text-secondary)}.filter-chip.is-active{background:rgba(0,208,132,.14);color:var(--accent-green);box-shadow:0 0 0 1px rgba(0,208,132,.18)}.flashcard-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:1fr}.flashcard-button{padding:0;border:0;background:transparent;text-align:left}.flip-card{height:240px;perspective:1400px;animation:fadeInUp .55s ease both}.flip-card-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .56s cubic-bezier(.2,.8,.2,1)}.flip-card.is-flipped .flip-card-inner{transform:rotateY(180deg)}.flip-card-back,.flip-card-front{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:space-between;min-height:100%;-webkit-backface-visibility:hidden;backface-visibility:hidden;box-shadow:var(--shadow-glow);transition:transform var(--transition-base),background var(--transition-base),box-shadow var(--transition-base)}.flip-card-front{background:radial-gradient(circle at top right,rgba(0,208,132,.18),transparent 34%),var(--bg-card)}.flip-card-back{transform:rotateY(180deg);background:radial-gradient(circle at bottom left,rgba(255,215,0,.12),transparent 38%),var(--bg-card-hover)}.flashcard-button:hover .flip-card-back,.flashcard-button:hover .flip-card-front{box-shadow:0 0 0 1px rgba(0,208,132,.16),0 18px 34px rgba(0,208,132,.1)}.card-kicker,.example-label,.flashcard-example,.flashcard-meaning,.lesson-explanation,.lesson-summary,.tap-indicator{color:var(--text-secondary)}.card-kicker,.tap-indicator{margin:0;text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;font-weight:700}.flashcard-abbr{margin:0;font-size:clamp(2.4rem,10vw,3.4rem);font-weight:800;letter-spacing:-.05em}.flashcard-full{margin:0;color:var(--accent-green);font-weight:800;font-size:1.32rem}.flashcard-example,.flashcard-meaning{margin:0;line-height:1.6}.lesson-list{display:flex;flex-direction:column;gap:16px}.lesson-card{overflow:hidden}.lesson-toggle{width:100%;justify-content:space-between;padding:0;border:0;background:transparent;text-align:left}.lesson-toggle,.lesson-toggle-copy{display:flex;align-items:center;gap:14px}.lesson-emoji{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:14px;background:rgba(255,255,255,.05);font-size:1.4rem}.lesson-title{display:block;font-weight:700;font-size:1.12rem}.lesson-summary{display:block;margin-top:6px;line-height:1.5}.lesson-caret{display:inline-flex;align-items:center;justify-content:center;min-width:36px;min-height:36px;border-radius:999px;background:rgba(255,255,255,.05);font-size:1.5rem;line-height:1;transition:transform var(--transition-base)}.lesson-caret.is-open{transform:rotate(45deg)}.lesson-body{max-height:0;overflow:hidden;opacity:0;transition:max-height .42s ease,opacity .26s ease,padding-top .26s ease}.lesson-card.is-open .lesson-body{max-height:1600px;opacity:1;padding-top:20px}.comparison-grid{display:grid;grid-gap:14px;gap:14px;grid-template-columns:1fr}.comparison-column{padding:16px;border:1px solid rgba(255,255,255,.06);border-radius:var(--radius-md);background:rgba(4,10,8,.4)}.comparison-natural{border-color:rgba(0,208,132,.18);background:radial-gradient(circle at top right,rgba(0,208,132,.14),transparent 40%),rgba(4,10,8,.4)}.comparison-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.comparison-label{margin:0 0 12px;color:var(--accent-yellow);font-size:.88rem;font-weight:700}.comparison-column p:last-child{margin:0;line-height:1.65}.lesson-explanation{margin:20px 0 0;line-height:1.75}.examples-list{display:flex;flex-direction:column;gap:12px;margin-top:20px}.example-row{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:14px 16px;border-radius:var(--radius-md);background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.05)}.example-copy{display:flex;flex-direction:column;gap:8px}.example-copy p{margin:0;line-height:1.55}.example-natural{color:var(--text-primary);font-weight:600}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;padding:0;background:rgba(255,255,255,.05);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-primary);cursor:pointer;font-size:1.1rem;transition:background .2s,transform .15s}.icon-button:hover:not(:disabled){background:rgba(255,255,255,.1);transform:scale(1.05)}.icon-button:disabled{opacity:.6;cursor:not-allowed}.icon-button-slow{font-size:1rem;background:rgba(255,200,50,.06);border-color:rgba(255,200,50,.12)}.icon-button-slow:hover:not(:disabled){background:rgba(255,200,50,.12)}.speak-pair{display:inline-flex;gap:6px;align-items:center;flex-shrink:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:2px solid rgba(0,208,132,.75);outline-offset:3px}@media (min-width:640px){.main-content{padding-top:110px}.hero{padding:34px 30px}.content-grid,.flashcard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:768px){.navbar{padding:12px 16px}.mobile-nav-toggle{display:none}.navbar-links{position:static;display:flex;flex-direction:row;align-items:center;gap:4px;padding:0;border:0;background:transparent;box-shadow:none}.comparison-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (min-width:960px){.flashcard-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@keyframes fadeInUp{0%{opacity:0;transform:translate3d(0,18px,0)}to{opacity:1;transform:translateZ(0)}}@keyframes pulse{0%,to{opacity:.82;transform:scale(1);background-position:0 50%}50%{opacity:1;transform:scale(1.015);background-position:100% 50%}}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@keyframes audioWave{0%,to{transform:scaleY(.55);opacity:.72}50%{transform:scaleY(1.15);opacity:1}}