/* Word Swipe - 刷单词 */
*{margin:0;padding:0;box-sizing:border-box}
.ws-app{position:fixed;inset:0;background:#0a0a1a;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:#fff;overflow:hidden;display:flex;flex-direction:column;-webkit-user-select:none;user-select:none}

/* Header */
.ws-header{display:flex;align-items:center;padding:10px 14px;background:rgba(10,10,26,.92);backdrop-filter:blur(10px);z-index:100;flex-shrink:0;border-bottom:1px solid rgba(255,255,255,.06);position:relative}
.ws-back{color:#fff;text-decoration:none;font-size:20px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:background .2s;flex-shrink:0}
.ws-back:active{background:rgba(255,255,255,.1)}
.ws-header-title{flex:1;text-align:center;font-size:16px;font-weight:600}
.ws-header-right{display:flex;align-items:center;gap:8px;flex-shrink:0}
.ws-points-badge{background:linear-gradient(135deg,#f5af19,#f12711);padding:3px 10px;border-radius:20px;font-size:13px;font-weight:700;display:flex;align-items:center;gap:3px;color:#fff}
.ws-points-badge i{font-size:12px}
.ws-points-badge.ws-pts-pop{animation:ws-pop .35s ease}
.ws-streak-badge{background:linear-gradient(135deg,#ff6b35,#ff4444);padding:3px 10px;border-radius:20px;font-size:13px;font-weight:700;display:flex;align-items:center;gap:3px;transition:transform .3s}
.ws-streak-badge::before{content:'🔥'}
.ws-streak-badge.ws-streak-pop{animation:ws-pop .35s ease}
.ws-progress-text{font-size:12px;opacity:.55;white-space:nowrap;cursor:pointer;position:relative;padding:2px 6px;border-radius:8px;transition:background .2s}
.ws-progress-text:active{background:rgba(255,255,255,.1)}
.ws-tier-popup{position:absolute;top:100%;right:14px;background:rgba(30,30,50,.95);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:8px 12px;z-index:200;min-width:140px;animation:ws-tier-in .2s ease}
.ws-tier-row{display:flex;align-items:center;gap:8px;padding:5px 0;font-size:13px;color:rgba(255,255,255,.85)}
.ws-tier-num{margin-left:auto;font-weight:700;font-size:14px}
.ws-tier-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.ws-tier-dot.ws-tier-new{background:#888}
.ws-tier-dot.ws-tier-t1{background:#4facfe}
.ws-tier-dot.ws-tier-t2{background:#f5af19}
.ws-tier-dot.ws-tier-t3{background:#00e676}
.ws-tier-dot.ws-tier-t4{background:#e040fb}
@keyframes ws-tier-in{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}

/* Progress Bar */
.ws-progress-bar{height:3px;background:rgba(255,255,255,.08);flex-shrink:0}
.ws-progress-fill{height:100%;background:linear-gradient(90deg,#4facfe,#00f2fe);transition:width .6s ease;border-radius:0 2px 2px 0;min-width:0}

/* Screens */
.ws-screen{display:none;flex:1;overflow:hidden;position:relative}
.ws-screen.active{display:flex;flex-direction:column}

/* === Grade Selection === */
.ws-select-content{flex:1;padding:30px 20px;overflow-y:auto;-webkit-overflow-scrolling:touch}
.ws-select-title{font-size:20px;font-weight:700;text-align:center;margin-bottom:8px}
.ws-select-subtitle{font-size:14px;opacity:.45;text-align:center;margin-bottom:28px}
.ws-grade-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;max-width:460px;margin:0 auto}
.ws-grade-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:18px 14px;cursor:pointer;transition:all .2s;text-align:center}
.ws-grade-card:active{transform:scale(.97);background:rgba(255,255,255,.09)}
.ws-grade-name{font-size:17px;font-weight:700;margin-bottom:4px}
.ws-grade-count{font-size:12px;opacity:.4;margin-bottom:10px}
.ws-grade-bar{height:4px;background:rgba(255,255,255,.08);border-radius:2px;overflow:hidden;margin-bottom:5px}
.ws-grade-bar-fill{height:100%;background:linear-gradient(90deg,#43e97b,#38f9d7);border-radius:2px;transition:width .3s}
.ws-grade-mastered{font-size:11px;opacity:.4}
.ws-grade-card.ws-grade-done{border-color:rgba(67,233,123,.3)}
.ws-grade-card.ws-grade-done .ws-grade-name::after{content:' ✓';color:#43e97b}

/* === Card Container === */
.ws-card-container{flex:1;position:relative;overflow:hidden}
.ws-card{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px 24px 60px;will-change:transform,opacity}
.ws-card.ws-dragging{transition:none!important}

/* Card transitions */
.ws-card.ws-exit-up{transition:transform .35s ease,opacity .35s ease;transform:translateY(-100%);opacity:0}
.ws-card.ws-exit-down{transition:transform .35s ease,opacity .35s ease;transform:translateY(100%);opacity:0}
.ws-card.ws-enter-below{transform:translateY(60%);opacity:0}
.ws-card.ws-enter-above{transform:translateY(-60%);opacity:0}
.ws-card.ws-enter-active{transition:transform .35s ease,opacity .35s ease;transform:translateY(0);opacity:1}

/* Review badge for history cards */
.ws-review-badge{position:absolute;top:12px;left:50%;transform:translateX(-50%);background:rgba(255,255,255,.15);backdrop-filter:blur(8px);color:rgba(255,255,255,.8);font-size:12px;padding:4px 14px;border-radius:20px;z-index:20;pointer-events:none;letter-spacing:.5px}

/* Swipe Hint */
.ws-swipe-hint{position:absolute;bottom:16px;left:0;right:0;text-align:center;font-size:12px;opacity:0;z-index:10;pointer-events:none;display:flex;flex-direction:column;align-items:center;gap:1px;transition:opacity .5s}
.ws-swipe-hint.ws-visible{opacity:.35;animation:ws-hint-bounce 2s ease-in-out infinite}
.ws-swipe-hint i{font-size:18px}
@keyframes ws-hint-bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}

/* === SHOW Card === */
.ws-show-word{font-size:50px;font-weight:800;letter-spacing:1px;text-align:center;margin-bottom:6px;text-shadow:0 2px 20px rgba(0,0,0,.3);line-height:1.15}
.ws-show-speaker{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.12);border:none;color:#fff;font-size:17px;cursor:pointer;display:flex;align-items:center;justify-content:center;margin-bottom:10px;transition:background .2s;flex-shrink:0}
.ws-show-speaker:active{background:rgba(255,255,255,.25)}
.ws-show-speaker.ws-speaking{animation:ws-pulse-ring 1s ease infinite}
@keyframes ws-pulse-ring{0%{box-shadow:0 0 0 0 rgba(79,172,254,.4)}70%{box-shadow:0 0 0 10px rgba(79,172,254,0)}100%{box-shadow:0 0 0 0 rgba(79,172,254,0)}}
.ws-show-translation{font-size:22px;opacity:.75;margin-bottom:28px;text-align:center}
.ws-sentence-wrap{background:rgba(255,255,255,.08);border-radius:16px;padding:16px 18px;max-width:340px;width:100%;text-align:center;backdrop-filter:blur(6px)}
.ws-sentence-text{font-size:16px;line-height:1.55;margin-bottom:6px;word-break:break-word}
.ws-hl{color:#ffd600;font-weight:700;font-style:normal}
.ws-sentence-cn{font-size:14px;opacity:.55;margin-bottom:6px}
.ws-sentence-speaker{background:none;border:none;color:rgba(255,255,255,.5);font-size:15px;cursor:pointer;padding:4px 8px}
.ws-sentence-speaker:active{color:#fff}
.ws-tag{position:absolute;top:16px;right:18px;font-size:22px;opacity:.7}

/* === Quiz Common === */
.ws-quiz-label{font-size:13px;opacity:.4;margin-bottom:14px;text-align:center;letter-spacing:1px}
.ws-quiz-word{font-size:40px;font-weight:700;text-align:center;margin-bottom:4px;line-height:1.15}
.ws-quiz-sub{font-size:14px;opacity:.4;margin-bottom:32px;text-align:center}
.ws-quiz-sentence{font-size:19px;line-height:1.6;text-align:center;margin-bottom:32px;padding:0 8px}
.ws-blank{display:inline-block;min-width:70px;border-bottom:2.5px solid rgba(255,255,255,.45);margin:0 3px;vertical-align:baseline}

/* Spell display */
.ws-spell-display{font-weight:700;text-align:center;margin-bottom:32px;font-family:'Courier New',Consolas,monospace}
.ws-spell-gap{color:#4facfe;border-bottom:3px solid #4facfe;padding:0 2px;margin:0 1px}

/* Options (vertical for E2C/C2E/FILL) */
.ws-options{display:flex;flex-direction:column;gap:11px;width:100%;max-width:340px}
.ws-option{background:rgba(255,255,255,.07);border:2px solid rgba(255,255,255,.12);border-radius:14px;padding:13px 18px;color:#fff;font-size:17px;text-align:center;cursor:pointer;transition:all .15s;-webkit-tap-highlight-color:transparent}
.ws-option:active:not(.ws-answered){transform:scale(.97);background:rgba(255,255,255,.12)}
.ws-option.ws-correct{background:rgba(67,233,123,.18)!important;border-color:#43e97b!important;animation:ws-pop .3s ease}
.ws-option.ws-wrong{background:rgba(245,87,108,.18)!important;border-color:#f5576c!important;animation:ws-shake .4s ease}
.ws-option.ws-dimmed{opacity:.25;pointer-events:none}
.ws-option.ws-answered{pointer-events:none}

/* Spell options (grid) */
.ws-spell-options{display:grid;grid-template-columns:repeat(4,1fr);gap:11px;max-width:280px;width:100%}
.ws-spell-opt{aspect-ratio:1;background:rgba(255,255,255,.07);border:2px solid rgba(255,255,255,.12);border-radius:14px;color:#fff;font-size:26px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;text-transform:lowercase;font-family:'Courier New',Consolas,monospace;-webkit-tap-highlight-color:transparent}
.ws-spell-opt:active:not(.ws-answered){transform:scale(.94)}
.ws-spell-opt.ws-correct{background:rgba(67,233,123,.18)!important;border-color:#43e97b!important;animation:ws-pop .3s ease}
.ws-spell-opt.ws-wrong{background:rgba(245,87,108,.18)!important;border-color:#f5576c!important;animation:ws-shake .4s ease}
.ws-spell-opt.ws-dimmed{opacity:.25;pointer-events:none}
.ws-spell-opt.ws-answered{pointer-events:none}

/* === Complete Card === */
.ws-complete{text-align:center;padding:0 20px}
.ws-complete-icon{font-size:60px;margin-bottom:16px}
.ws-complete-title{font-size:26px;font-weight:700;margin-bottom:8px}
.ws-complete-sub{font-size:15px;opacity:.5;margin-bottom:28px}
.ws-complete-stats{display:flex;gap:28px;justify-content:center;margin-bottom:28px}
.ws-stat{text-align:center}
.ws-stat-val{font-size:30px;font-weight:700}
.ws-stat-lbl{font-size:12px;opacity:.45;margin-top:2px}
.ws-complete-btn{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:25px;padding:11px 28px;color:#fff;font-size:15px;cursor:pointer;transition:background .2s}
.ws-complete-btn:active{background:rgba(255,255,255,.18)}

/* === Feedback Overlay === */
.ws-feedback{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none;z-index:50;opacity:0;transition:opacity .25s}
.ws-feedback.ws-show{opacity:1}
.ws-feedback-icon{font-size:80px}
.ws-fb-correct .ws-feedback-icon{color:#43e97b}
.ws-fb-wrong .ws-feedback-icon{color:#f5576c}

/* Floating points - spawn at center, fly to top-right badge */
.ws-float-pts{position:fixed;pointer-events:none;z-index:300;font-size:28px;font-weight:900;color:#ffd700;text-shadow:0 0 12px rgba(255,215,0,.6),0 2px 8px rgba(0,0,0,.4);white-space:nowrap}
.ws-float-pts.ws-bonus{font-size:34px}
/* Star particles that burst on spawn & arrival */
.ws-pts-particle{position:fixed;pointer-events:none;z-index:299;font-size:14px;opacity:0;animation:ws-particle-burst .6s ease-out forwards}
@keyframes ws-particle-burst{0%{opacity:1;transform:translate(0,0) scale(1)}100%{opacity:0;transform:var(--ws-p-dir) scale(0)}}
/* Shockwave ring on arrival at badge */
.ws-pts-ring{position:fixed;pointer-events:none;z-index:301;width:12px;height:12px;border-radius:50%;border:3px solid #ffd700;transform:translate(-50%,-50%) scale(1);opacity:.8;animation:ws-ring-expand .45s ease-out forwards}
@keyframes ws-ring-expand{0%{transform:translate(-50%,-50%) scale(1);opacity:.8;border-width:3px}100%{transform:translate(-50%,-50%) scale(4);opacity:0;border-width:1px}}

/* Word fly-in for FILL correct */
.ws-word-fly{position:absolute;font-size:22px;font-weight:700;color:#43e97b;pointer-events:none;z-index:60;text-shadow:0 2px 8px rgba(0,0,0,.3);animation:ws-fly-to-blank .5s ease-out forwards}
@keyframes ws-fly-to-blank{0%{opacity:0;transform:scale(2) translateY(30px)}60%{opacity:1;transform:scale(1.1) translateY(-5px)}100%{opacity:1;transform:scale(1) translateY(0)}}

/* Streak fire */
@keyframes ws-fire-in{0%{opacity:0;transform:scaleY(0)}50%{opacity:1;transform:scaleY(1.1)}100%{opacity:.6;transform:scaleY(1)}}
.ws-fire{position:fixed;bottom:0;left:0;right:0;height:80px;background:linear-gradient(to top,rgba(255,107,53,.25),transparent);pointer-events:none;z-index:200;animation:ws-fire-in .5s ease forwards}

/* === Animations === */
@keyframes ws-pop{0%{transform:scale(1)}50%{transform:scale(1.05)}100%{transform:scale(1)}}
@keyframes ws-shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}

.ws-anim-fade-up{animation:ws-kf-fade-up .45s ease both}
@keyframes ws-kf-fade-up{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:translateY(0)}}
.ws-anim-scale{animation:ws-kf-scale .4s ease both}
@keyframes ws-kf-scale{from{opacity:0;transform:scale(.75)}to{opacity:1;transform:scale(1)}}
.ws-anim-slide-r{animation:ws-kf-slide-r .4s ease both}
@keyframes ws-kf-slide-r{from{opacity:0;transform:translateX(-35px)}to{opacity:1;transform:translateX(0)}}
.ws-anim-flip{animation:ws-kf-flip .5s ease both}
@keyframes ws-kf-flip{from{opacity:0;transform:perspective(400px) rotateY(60deg)}to{opacity:1;transform:perspective(400px) rotateY(0)}}

/* Loading */
.ws-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;flex:1}
.ws-spinner{width:32px;height:32px;border:3px solid rgba(255,255,255,.1);border-top-color:#4facfe;border-radius:50%;animation:ws-spin .7s linear infinite}
@keyframes ws-spin{to{transform:rotate(360deg)}}
.ws-loading-text{font-size:14px;opacity:.5}

/* Responsive */
@media(min-width:500px){
    .ws-show-word{font-size:60px}
    .ws-quiz-word{font-size:48px}
    .ws-spell-display{font-size:52px}
    .ws-options{max-width:380px}
    .ws-spell-options{max-width:320px}
    .ws-sentence-wrap{max-width:400px}
}
@media(min-width:768px){
    .ws-show-word{font-size:68px}
    .ws-quiz-word{font-size:56px}
}