:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--accent: #f59e0b;--accent-light: #fef3c7;--success: #10b981;--success-light: #d1fae5;--danger: #ef4444;--danger-light: #fee2e2;--warning: #f97316;--bg-page: #f8fafc;--bg-card: #ffffff;--text-main: #1e293b;--text-muted: #64748b;--border-color: #e2e8f0;--radius-lg: 18px;--radius-md: 12px;--radius-sm: 8px;--shadow-sm: 0 1px 3px rgba(0,0,0,.06);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--shadow-lg: 0 10px 25px -5px rgba(0,0,0,.1), 0 8px 10px -6px rgba(0,0,0,.05)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,WenQuanYi Micro Hei,sans-serif;background-color:var(--bg-page);color:var(--text-main);min-height:100vh;display:flex;flex-direction:column}#app{display:flex;flex-direction:column;min-height:100vh}.app-header{background:#fff;border-bottom:1px solid var(--border-color);padding:12px 24px;position:sticky;top:0;z-index:50;box-shadow:var(--shadow-sm)}.header-inner{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit}.brand-icon{font-size:28px;line-height:1;background:var(--primary-light);padding:6px 10px;border-radius:var(--radius-sm)}.brand-text h1{font-size:20px;font-weight:800;color:#1e1b4b;display:flex;align-items:center;gap:8px}.brand-text p{font-size:12px;color:var(--text-muted)}.header-actions{display:flex;align-items:center;gap:12px}.queue-pill{display:inline-flex;align-items:center;gap:6px;background:#eff6ff;border:1px solid #bfdbfe;padding:6px 12px;border-radius:9999px;font-size:13px;font-weight:600;color:#1d4ed8}.queue-badge{background:#2563eb;color:#fff;padding:2px 8px;border-radius:9999px;font-size:12px;font-weight:700}.nav-tabs{display:flex;gap:6px;background:#f1f5f9;padding:4px;border-radius:var(--radius-md)}.nav-tab-btn{padding:6px 14px;border:none;background:transparent;color:var(--text-muted);font-size:14px;font-weight:500;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease}.nav-tab-btn.active{background:#fff;color:var(--primary);box-shadow:var(--shadow-sm);font-weight:600}.main-container{max-width:1080px;width:100%;margin:0 auto;padding:24px 16px 60px;flex:1}.drag-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#4f46e5eb;color:#fff;z-index:1000;align-items:center;justify-content:center;flex-direction:column;gap:16px;font-size:22px;font-weight:700;pointer-events:none;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.drag-overlay.active{display:flex}.drag-overlay-box{border:3px dashed #ffffff;padding:40px 60px;border-radius:var(--radius-lg);text-align:center}.study-view{display:flex;flex-direction:column;align-items:center;gap:20px}.study-topbar{width:100%;max-width:600px;display:flex;align-items:center;justify-content:space-between;font-size:14px;color:var(--text-muted)}.progress-track{width:100%;max-width:600px;height:8px;background:#e2e8f0;border-radius:9999px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#6366f1,#3b82f6);border-radius:9999px;transition:width .3s ease}.card-perspective-box{width:100%;max-width:520px;height:400px;perspective:1200px;cursor:pointer;-webkit-user-select:none;user-select:none}.flashcard-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.4,0,.2,1);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.flashcard-inner.is-flipped{transform:rotateY(180deg)}.card-face{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-lg);background:#fff;border:2px solid #e2e8f0;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:24px;box-shadow:inset 0 0 0 1px #fff9}.card-face.card-front{background:radial-gradient(circle at center,#fff 60%,#fafafa)}.card-face.card-back{background:radial-gradient(circle at center,#fff 60%,#fcfbf7);transform:rotateY(180deg);border-color:#cbd5e1}.tianzige-container{width:200px;height:200px;margin:auto;position:relative;display:flex;align-items:center;justify-content:center;border:2px solid #f87171;background-color:#fffaf0;border-radius:8px}.tianzige-container.no-grid{border:none;background:transparent}.tianzige-container:before,.tianzige-container:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.tianzige-container:not(.no-grid):before{background:linear-gradient(to right,transparent 49.5%,#fca5a5 49.5%,#fca5a5 50.5%,transparent 50.5%),linear-gradient(to bottom,transparent 49.5%,#fca5a5 49.5%,#fca5a5 50.5%,transparent 50.5%)}.tianzige-container:not(.no-grid):after{background:linear-gradient(45deg,transparent 49.5%,#fecaca 49.5%,#fecaca 50.5%,transparent 50.5%),linear-gradient(-45deg,transparent 49.5%,#fecaca 49.5%,#fecaca 50.5%,transparent 50.5%)}.chinese-char{font-size:110px;font-family:KaiTi,STKaiti,BiauKai,楷体,Microsoft YaHei,serif;color:#111827;line-height:1;position:relative;z-index:2}.card-header-bar{width:100%;display:flex;align-items:center;justify-content:space-between}.status-tag{font-size:12px;font-weight:600;padding:3px 10px;border-radius:9999px;background:#f1f5f9;color:#475569}.status-tag.status-new{background:#e0e7ff;color:#4338ca}.status-tag.status-learning{background:#fef3c7;color:#b45309}.status-tag.status-review{background:#e0f2fe;color:#0369a1}.status-tag.status-mastered{background:#dcfce7;color:#15803d}.btn-speaker{background:#f8fafc;border:1px solid #e2e8f0;color:#4338ca;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;transition:all .2s ease}.btn-speaker:hover{background:#eef2ff;transform:scale(1.08);border-color:#818cf8}.btn-speaker.speaking{animation:pulse-ring 1s infinite;background:#e0e7ff}@keyframes pulse-ring{0%{box-shadow:0 0 #6366f180}70%{box-shadow:0 0 0 10px #6366f100}to{box-shadow:0 0 #6366f100}}.card-hint-bottom{font-size:13px;color:#94a3b8;display:flex;align-items:center;gap:6px}.kbd-badge{background:#f1f5f9;border:1px solid #cbd5e1;padding:1px 6px;border-radius:4px;font-size:11px;font-weight:600;color:#475569}.back-pinyin-section{text-align:center;margin-top:4px}.back-pinyin{font-size:40px;font-weight:700;color:#dc2626;font-family:PingFang SC,Segoe UI,sans-serif;letter-spacing:2px}.back-pinyin-breakdown{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:6px;font-size:13px;color:#64748b}.breakdown-item{background:#f8fafc;border:1px solid #e2e8f0;padding:2px 8px;border-radius:6px}.breakdown-label{color:#94a3b8;font-size:11px;margin-right:4px}.back-words-section{width:100%;background:#f8fafc;border:1px solid #e2e8f0;border-radius:var(--radius-md);padding:14px;margin-top:12px}.back-words-title{font-size:12px;font-weight:700;color:#64748b;margin-bottom:8px;display:flex;align-items:center;gap:4px}.back-words-list{display:flex;flex-wrap:wrap;gap:8px}.word-chip{background:#fff;border:1px solid #cbd5e1;padding:4px 10px;border-radius:6px;font-size:14px;font-weight:600;color:#1e293b;cursor:pointer;transition:all .15s ease}.word-chip:hover{background:#eff6ff;border-color:#93c5fd;color:#2563eb}.back-sentence{font-size:13px;color:#475569;line-height:1.5;margin-top:8px;background:#fff;padding:8px 12px;border-radius:6px;border-left:3px solid #6366f1}.study-actions-panel{width:100%;max-width:520px;display:flex;flex-direction:column;gap:12px}.sm2-buttons-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.sm2-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:12px 6px;border-radius:var(--radius-md);border:1px solid var(--border-color);background:#fff;cursor:pointer;transition:all .2s ease;font-weight:600}.sm2-btn .btn-title{font-size:15px}.sm2-btn .btn-sub{font-size:11px;color:var(--text-muted);margin-top:2px}.sm2-btn .btn-key{margin-top:4px;font-size:10px;background:#0000000d;padding:1px 5px;border-radius:4px}.sm2-btn.btn-again{color:#dc2626;border-color:#fecaca}.sm2-btn.btn-again:hover{background:#fef2f2;border-color:#f87171}.sm2-btn.btn-hard{color:#d97706;border-color:#fde68a}.sm2-btn.btn-hard:hover{background:#fffbeb;border-color:#fbbf24}.sm2-btn.btn-good{color:#2563eb;border-color:#bfdbfe;background:#f8faff}.sm2-btn.btn-good:hover{background:#eff6ff;border-color:#60a5fa;box-shadow:var(--shadow-sm)}.sm2-btn.btn-easy{color:#16a34a;border-color:#bbf7d0}.sm2-btn.btn-easy:hover{background:#f0fdf4;border-color:#4ade80}.empty-queue-box{background:#fff;border-radius:var(--radius-lg);border:2px dashed #cbd5e1;padding:48px 24px;text-align:center;max-width:580px;width:100%;box-shadow:var(--shadow-sm)}.empty-icon{font-size:56px;margin-bottom:16px}.empty-title{font-size:22px;font-weight:800;color:#1e293b;margin-bottom:8px}.empty-desc{font-size:14px;color:#64748b;margin-bottom:24px;line-height:1.6}.btn-primary{background:#4f46e5;color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-md);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;gap:8px}.btn-primary:hover{background:#4338ca}.btn-secondary{background:#fff;color:#334155;border:1px solid #cbd5e1;padding:10px 18px;border-radius:var(--radius-md);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;gap:8px}.btn-secondary:hover{background:#f8fafc;border-color:#94a3b8}.dropzone-card{border:2px dashed #93c5fd;background:#f0f7ff;border-radius:var(--radius-lg);padding:32px 20px;text-align:center;cursor:pointer;transition:all .2s ease;margin-top:16px}.dropzone-card:hover{border-color:#3b82f6;background:#e0f0fe}.dropzone-icon{font-size:40px;margin-bottom:8px}.manager-view{background:#fff;border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:24px;box-shadow:var(--shadow-sm)}.view-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:12px}.search-input{padding:8px 14px;border:1px solid #cbd5e1;border-radius:var(--radius-sm);font-size:14px;width:200px}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-top:20px}.mini-card{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius-md);padding:16px;display:flex;flex-direction:column;gap:8px;transition:all .2s ease}.mini-card:hover{box-shadow:var(--shadow-md);border-color:#93c5fd}.mini-card-header{display:flex;justify-content:space-between;align-items:center}.mini-char{font-size:32px;font-family:KaiTi,STKaiti,楷体,serif;font-weight:700}.mini-pinyin{font-size:18px;font-weight:700;color:#dc2626}.mini-meta{font-size:12px;color:#64748b;display:flex;justify-content:space-between}.preset-view{display:flex;flex-direction:column;gap:20px}.preset-card{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm)}.preset-title{font-size:18px;font-weight:700;margin-bottom:8px}.preset-tags{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 16px}.char-chip{background:#f8fafc;border:1px solid #e2e8f0;padding:4px 10px;border-radius:6px;font-size:14px;font-weight:600}.guide-view{background:#fff;border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:28px;box-shadow:var(--shadow-sm);line-height:1.7}.guide-section{margin-bottom:24px}.guide-section h3{font-size:18px;color:#1e293b;margin-bottom:10px;border-bottom:2px solid #e2e8f0;padding-bottom:6px}.app-footer{text-align:center;padding:20px;font-size:13px;color:#94a3b8;border-top:1px solid var(--border-color);background:#fff;margin-top:auto}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a99;z-index:100;display:flex;align-items:center;justify-content:center;padding:16px;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.modal-content{background:#fff;border-radius:var(--radius-lg);max-width:600px;width:100%;padding:24px;box-shadow:var(--shadow-lg);max-height:90vh;overflow-y:auto}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.modal-title{font-size:18px;font-weight:700}.close-btn{background:none;border:none;font-size:24px;color:#94a3b8;cursor:pointer;line-height:1}.close-btn:hover{color:#1e293b}.paste-textarea{width:100%;height:180px;border:1px solid #cbd5e1;border-radius:var(--radius-md);padding:12px;font-family:inherit;font-size:14px;resize:vertical;margin-bottom:16px}.paste-textarea:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 3px #6366f126}.modal-actions{display:flex;justify-content:flex-end;gap:10px}.toast-msg{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#1e293b;color:#fff;padding:10px 20px;border-radius:9999px;font-size:14px;font-weight:500;z-index:2000;box-shadow:var(--shadow-lg);pointer-events:none;opacity:0;transition:opacity .25s ease,transform .25s ease}.toast-msg.show{opacity:1;transform:translate(-50%) translateY(-10px)}