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.45em)}.pinyin-fourlines-content{position:relative;z-index:1;font-size:1.5rem;font-weight:700;color:#222;letter-spacing:.02em}.pinyin-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:12px;box-shadow:0 4px 12px var(--shadow);display:flex;flex-direction:column;gap:12px;justify-content:space-around}.pinyin-card-top{display:flex;flex-direction:row;gap:16px;align-items:stretch;min-height:160px}.pinyin-card-figure{flex:0 0 80%;min-width:0;min-height:140px;display:flex;align-items:center;justify-content:center;border-radius:8px;overflow:hidden;background:#5b9bd50f}.pinyin-card-figure img{width:100%;height:100%;min-height:140px;object-fit:contain;border-radius:8px}.pinyin-card-body{flex:1;min-width:0;display:flex;flex-direction:column;justify-content:center;gap:6px}.pinyin-card-label{font-size:.85rem;color:var(--title-color);opacity:.9}.pinyin-card-pinyin-wrap{min-height:3em}.pinyin-card-char-wrap{min-height:3.5em}.pinyin-card-caption{width:100%;padding-top:8px;border-top:1px solid rgba(91,155,213,.2)}.pinyin-card-caption-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 4px}.pinyin-card-caption-cell{display:flex;flex-direction:column;align-items:stretch;min-width:2.4em;max-width:3.2em;border:1px solid rgba(91,155,213,.25);border-radius:6px;overflow:hidden;background:#fff}.pinyin-card-caption-cell .pinyin-fourlines{min-height:2.2em;padding:4px 6px;border-bottom:1px solid rgba(91,155,213,.15)}.pinyin-card-caption-cell .pinyin-fourlines-lines{opacity:.6}.pinyin-card-caption-cell .pinyin-fourlines-content{font-size:.72rem;font-weight:600}.pinyin-card-caption-cell .tianzige{min-height:2.4em;padding:4px 6px}.pinyin-card-caption-cell .tianzige-grid{background-size:28px 28px;opacity:.7}.pinyin-card-caption-cell .tianzige-content{font-size:1.05rem;font-weight:700}.lazy-visible{min-height:0}.lazy-visible-placeholder{width:100%;border-radius:12px;border:1px dashed rgba(91,155,213,.35);background:linear-gradient(105deg,#5b9bd50f,#5b9bd51f 45%,#5b9bd50f);background-size:200% 100%;animation:lazy-visible-pulse 1.4s ease-in-out infinite}@keyframes lazy-visible-pulse{0%{background-position:100% 0}to{background-position:-100% 0}}@media (prefers-reduced-motion: reduce){.lazy-visible-placeholder{animation:none;background:#5b9bd514}}.card-section{margin-bottom:32px}.card-section-title{font-size:1.5rem;color:var(--title-color);margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid var(--card-border)}.card-section-grid{display:grid;grid-template-columns:1fr;gap:20px;max-width:640px;margin:0 auto}@media (min-width: 768px){.card-section-grid{grid-template-columns:repeat(2,1fr);max-width:1440px}}.sound-table-section{margin-bottom:28px}.sound-table-section-title{font-size:1.2rem;color:var(--title-color);margin:0 0 14px;font-weight:700}.sound-table{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(108px,1fr))}.sound-table--final{grid-template-columns:repeat(auto-fill,minmax(118px,1fr))}.sound-table-cell{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:10px 8px;border:1px solid rgba(91,155,213,.35);border-radius:10px;background:var(--card-bg);box-shadow:0 2px 8px var(--shadow);text-align:center;min-height:72px}.sound-table-pinyin{font-size:1rem;font-weight:700;letter-spacing:.02em}.sound-table-char{font-size:1.25rem;font-weight:600;color:var(--title-color)}.sound-table-tones{font-size:.72rem;line-height:1.35;color:#555;word-break:break-all}.sound-table-char-pinyin{font-size:.95rem;font-weight:600;color:#444}.pinyin-study-hub{padding-top:4px}.pinyin-hub-group{margin-bottom:28px}.pinyin-hub-group-head{margin-bottom:12px}.pinyin-hub-badge{display:inline-flex;align-items:center;justify-content:center;min-width:44px;height:44px;padding:0 14px;border-radius:12px;font-size:1.35rem;font-weight:800;letter-spacing:.06em;color:#fff;box-shadow:0 4px 14px #5b9bd559}.pinyin-hub-badge--learn{background:linear-gradient(135deg,#5b9bd5,#3d7dbe)}.pinyin-hub-badge--practice{background:linear-gradient(135deg,#52c41a,#389e0d);box-shadow:0 4px 14px #52c41a59}.pinyin-hub-badge--test{background:linear-gradient(135deg,#fa8c16,#d46b08);box-shadow:0 4px 14px #fa8c1659}.pinyin-hub-subline{margin:14px 0 10px;font-size:.95rem;font-weight:700;color:var(--title-color);opacity:.85}.pinyin-hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(152px,1fr));gap:14px}.pinyin-hub-tile{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:112px;padding:16px 12px;border:2px solid rgba(91,155,213,.28);border-radius:16px;background:#fff;box-shadow:0 6px 20px #5b9bd51f;cursor:pointer;transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease;font:inherit;color:var(--title-color)}.pinyin-hub-tile:hover{transform:translateY(-3px);border-color:#5b9bd58c;box-shadow:0 10px 28px #5b9bd533}.pinyin-hub-tile--active{border-color:#5b9bd5;box-shadow:0 0 0 3px #5b9bd540,0 10px 28px #5b9bd538;background:linear-gradient(180deg,#f5fbff,#fff 55%)}.pinyin-hub-grid--practice .pinyin-hub-tile--active{border-color:#52c41a;box-shadow:0 0 0 3px #52c41a38,0 10px 28px #52c41a2e;background:linear-gradient(180deg,#f6ffed,#fff 55%)}.pinyin-hub-grid--test .pinyin-hub-tile--active{border-color:#fa8c16;box-shadow:0 0 0 3px #fa8c1638,0 10px 28px #fa8c1626;background:linear-gradient(180deg,#fff7e6,#fff 55%)}.pinyin-hub-tile-icon{font-size:2.25rem;line-height:1;color:#5b9bd5}.pinyin-hub-grid--practice .pinyin-hub-tile-icon{color:#52c41a}.pinyin-hub-grid--test .pinyin-hub-tile-icon{color:#fa8c16}.pinyin-hub-tile--active .pinyin-hub-tile-icon{filter:brightness(.92)}.pinyin-hub-tile-label{font-size:.95rem;font-weight:700;text-align:center;line-height:1.35}.pinyin-hub-content{margin-top:8px;padding-top:24px;border-top:1px solid rgba(91,155,213,.22)}.pinyin-hub-placeholder{padding:32px 16px 48px}.pinyin-hub-placeholder .ant-empty-description{color:#666;font-size:1rem}.whiteboard-drawer-root .ant-drawer-body.whiteboard-drawer__body{flex:1;min-height:0;height:100%}.whiteboard-drawer-root.ant-drawer-right .ant-drawer-content-wrapper{max-width:100vw}.whiteboard-drawer__inner{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}.whiteboard-drawer-root.ant-drawer-bottom .ant-drawer-body.whiteboard-drawer__body{overscroll-behavior:contain}@media (max-width: 767px){.whiteboard-drawer-root.ant-drawer-bottom .whiteboard-panel__frame{touch-action:none}}.whiteboard-drawer__loading{display:flex;align-items:center;justify-content:center;min-height:240px;padding:48px 24px}.app-side-dock{position:fixed;z-index:900;right:max(10px,env(safe-area-inset-right,0px));top:100px;transform:translateY(-50%);display:flex;flex-direction:column;align-items:center;gap:10px;padding:10px;background:#fff;border-radius:12px;box-shadow:0 4px 14px #00000024;border:1px solid rgba(91,155,213,.28)}.app-side-dock-btn{box-sizing:border-box;width:48px;height:48px;padding:0;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;cursor:pointer;border-width:1px;border-style:solid;font:inherit;box-shadow:0 4px 14px #00000024;transition:transform .15s ease,box-shadow .15s ease,filter .15s ease,border-color .15s ease}.app-side-dock-btn:hover{filter:brightness(1.05);box-shadow:0 6px 18px #0000002e}.app-side-dock-btn:active{transform:scale(.96)}.app-side-dock-btn:focus-visible{outline:2px solid rgba(91,155,213,.85);outline-offset:3px}.app-side-dock-btn--heart{color:#e85a7a;border-color:#e85a7a73;background:#fff0f5fa}.app-side-dock-btn--heart:hover{border-color:#e85a7aa6;background:#ffe4ecfc}.app-side-dock-btn--heart:focus-visible{outline-color:#e85a7abf}.app-side-dock-btn--board{border-color:#2d501673;background:linear-gradient(160deg,#2d5016,#1f350f);color:#e8f5d4}.app-side-dock-btn--board:hover{border-color:#2d501699}.app-side-dock-btn--top{color:#3d7dbe;border-color:#5b9bd573;background:#5b9bd51f}.app-side-dock-btn--top:hover{border-color:#5b9bd599;background:#5b9bd52e}.app-side-dock-btn__icon{display:block;flex-shrink:0}.app-side-dock-btn__icon--heart{width:24px;height:24px;display:flex;align-items:center;justify-content:center}.app-side-dock-btn__icon--board{width:26px;height:26px}.app-side-dock-btn__icon--top{width:22px;height:22px;font-size:22px}.app{max-width:100%;min-height:100dvh;display:flex;flex-direction:column}.app-main{flex:1 1 auto}.app-root-tabs{margin-top:4px}.app-root-tabs>.ant-tabs-nav{margin-bottom:16px}.app-nested-tabs>.ant-tabs-nav{margin-bottom:18px}.app-tab-panel{padding-top:4px}.app-lazy-fallback{display:flex;align-items:center;justify-content:center;min-height:200px;padding:48px 24px}.app-header{margin-bottom:28px}.app-header-main{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-start;gap:12px 16px}.app-header-titles{flex:1 1 auto;min-width:min(100%,200px);text-align:center}.app-header-titles h1{font-size:1.75rem;color:var(--title-color);margin:0 0 4px}@media (min-width: 480px){.app-header-titles{text-align:left}}.app-subtitle{font-size:1rem;color:#666;margin:0}.app-footer{margin-top:36px;padding:20px 16px 28px;border-top:1px solid rgba(91,155,213,.2);text-align:center;font-size:.875rem;color:#666;line-height:1.65}.app-footer-line{margin:0 0 6px}.app-footer-line:last-child{margin-bottom:0}.app-footer a{color:#3d7dbe;text-decoration:none}.app-footer a:hover{text-decoration:underline}.app-donation-modal-body{padding-top:8px!important}.app-donation-intro{margin:0 0 16px;text-align:center;font-size:.95rem;color:#555;line-height:1.55}.app-donation-qr-wrap{display:flex;justify-content:center;align-items:center;padding:4px 0 8px}.app-donation-qr{max-width:min(320px,88vw);height:auto;border-radius:12px;box-shadow:0 4px 20px #00000014}:root{--card-bg: #fef9e6;--card-border: #5b9bd5;--title-color: #2c3e50;--accent-red: #e74c3c;--accent-blue: #3498db;--shadow: rgba(91, 155, 213, .2)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:sans-serif;background:linear-gradient(180deg,#e8f4fc,#fff 30%);min-height:100vh;padding:24px;color:var(--title-color)}#root{max-width:100%}