:root{--bg: #fbf7f4;--panel: #ffffff;--panel-soft: #fff0e8;--ink: #1c1715;--muted: #6e655f;--line: #e9dfd7;--brand: #c8281e;--brand-strong: #971c14;--accent: #d4a017;--ok: #1f9d55;--warn: #b45309;--shadow: 0 14px 30px rgba(120, 30, 20, .08)}*{box-sizing:border-box}body{margin:0;font-family:Trebuchet MS,Segoe UI,Roboto,Noto Sans,Noto Sans Vietnamese,Noto Sans Thai,PingFang SC,Microsoft YaHei,sans-serif;color:var(--ink);background:radial-gradient(circle at 8% 6%,#ffe2d4 0,transparent 30%),radial-gradient(circle at 92% 10%,#fde2c0 0,transparent 32%),linear-gradient(180deg,#fff5ec,#fbf7f4);min-height:100vh}.hero{max-width:1080px;margin:0 auto;padding:24px 16px 10px;position:relative}.lang-switch{position:absolute;right:16px;top:14px;display:inline-flex;gap:6px;align-items:center;color:var(--muted);font-size:.9rem}.lang-switch a{color:var(--muted);text-decoration:none}.lang-switch a[aria-current=page]{color:var(--ink);font-weight:700}.brand-row{display:flex;align-items:center;gap:10px}.badge{width:38px;height:38px;border-radius:10px;background:linear-gradient(140deg,#d33327,#931a12);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;box-shadow:var(--shadow);font-size:1rem}h1{margin:0;font-size:1.6rem}.subtitle{margin:8px 0 0;color:var(--muted)}.topnav{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px}.topnav a{padding:8px 12px;border:1px solid var(--line);border-radius:999px;text-decoration:none;color:var(--ink);background:#ffffffd9;font-size:.92rem}.topnav a[aria-current=page]{border-color:var(--brand);color:var(--brand-strong);background:#ffe7df;font-weight:700}main{max-width:1080px;margin:0 auto;padding:10px 16px 24px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow)}.tool-card{text-decoration:none;color:inherit;display:block}.tool-card h3{margin:4px 0 8px}.tool-card p{margin:0;color:var(--muted)}.tool-card:hover{border-color:#efb178;transform:translateY(-1px)}.kicker{font-size:.8rem;color:var(--brand-strong);font-weight:700;letter-spacing:.06em;text-transform:uppercase}.goal-banner{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;padding:12px 16px;border-radius:14px;background:linear-gradient(90deg,#fff1e6,#fff8ef);border:1px solid #f4d4bc;margin:14px 0}.goal-banner .goal-line{font-weight:700;color:var(--brand-strong)}.goal-banner .goal-meta{color:var(--muted);font-size:.92rem}.goal-banner button{margin-left:auto;background:transparent;border:1px solid var(--line);border-radius:999px;padding:6px 12px;cursor:pointer;color:var(--muted);font-size:.85rem}.goal-banner button:hover{color:var(--brand-strong);border-color:var(--brand)}.drill{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow)}.drill .hanzi{font-size:3.2rem;font-weight:700;text-align:center;margin:8px 0 4px;letter-spacing:.1em;font-family:PingFang SC,Microsoft YaHei,"Noto Serif SC",serif}.drill .pinyin{text-align:center;color:var(--muted);font-size:1rem;margin-bottom:16px}.drill .question{text-align:center;font-size:1.1rem;margin:4px 0 16px;color:var(--ink)}.drill .choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}.drill .choices button{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fff;text-align:left;cursor:pointer;font-size:1rem;color:var(--ink);transition:all .15s}.drill .choices button:hover{border-color:var(--brand)}.drill .choices button.correct{background:#e9f8ef;border-color:var(--ok);color:#155e2e}.drill .choices button.wrong{background:#fdecea;border-color:var(--brand);color:var(--brand-strong)}.drill .choices button.disabled{pointer-events:none;opacity:.7}.drill .explain{margin-top:14px;padding:12px;border-radius:12px;background:#fff8ef;border:1px dashed #efb178;color:var(--ink);font-size:.95rem}.tone-panel{display:grid;gap:14px}.tone-listen{min-height:210px;display:grid;place-items:center;text-align:center}.tone-mark{font-family:PingFang SC,Microsoft YaHei,"Noto Serif SC",serif;font-size:3.4rem;font-weight:700;letter-spacing:0;margin:8px 0}.tone-answer{display:grid;grid-template-columns:repeat(4,minmax(130px,1fr));gap:10px}.tone-answer button{min-height:76px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);cursor:pointer;font:inherit;text-align:center;padding:10px}.tone-answer button strong{display:block;color:var(--brand-strong);margin-bottom:3px}.tone-answer button:hover{border-color:var(--brand)}.tone-answer button.correct{background:#e9f8ef;border-color:var(--ok);color:#155e2e}.tone-answer button.wrong{background:#fdecea;border-color:var(--brand);color:var(--brand-strong)}.tone-answer button.disabled{pointer-events:none;opacity:.72}.drill-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;color:var(--muted);font-size:.92rem}.drill-toolbar .progress{font-weight:700;color:var(--brand-strong)}.drill-toolbar button{background:transparent;border:1px solid var(--line);border-radius:999px;padding:6px 12px;cursor:pointer;color:var(--muted);font-size:.85rem}.drill-toolbar button:hover{color:var(--brand-strong);border-color:var(--brand)}.audio-btn{display:inline-flex;align-items:center;gap:6px;background:transparent;border:1px solid var(--line);border-radius:999px;padding:4px 12px;cursor:pointer;color:var(--muted);font-size:.85rem}.audio-btn:hover{color:var(--brand-strong);border-color:var(--brand)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#1c171580;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.modal-card{background:#fff;border-radius:18px;padding:24px;max-width:460px;width:100%;box-shadow:0 20px 50px #00000040}.modal-card h2{margin:0 0 12px}.modal-card label{display:block;margin:12px 0 4px;color:var(--muted);font-size:.9rem}.modal-card select,.modal-card input{width:100%;padding:10px;border-radius:10px;border:1px solid var(--line);font-size:1rem;background:#fff;color:var(--ink)}.modal-card .actions{display:flex;gap:10px;margin-top:18px;justify-content:flex-end}.modal-card .actions button{padding:10px 18px;border-radius:999px;border:1px solid var(--line);background:#fff;cursor:pointer;font-size:.95rem}.modal-card .actions button.primary{background:var(--brand);color:#fff;border-color:var(--brand);font-weight:700}.modal-card .actions button.primary:hover{background:var(--brand-strong)}.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.chip{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.9rem;color:var(--ink)}.chip strong{color:var(--brand-strong)}.article{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow)}.article h2{margin-top:1.4em}.article h3{margin-top:1.2em}.article p,.article li{line-height:1.7;color:#2a241f}.article a{color:var(--brand-strong)}.feedback-section{margin:22px 0 28px;padding:18px;border:1px solid #f1d1bc;border-radius:8px;background:#fff8ef}.feedback-section h2{margin-top:0}.feedback-form{display:grid;gap:12px;margin-top:14px}.feedback-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.feedback-form label{display:grid;gap:6px;color:var(--muted);font-size:.92rem}.feedback-form input,.feedback-form select,.feedback-form textarea{width:100%;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font:inherit;padding:10px 12px}.feedback-form textarea{resize:vertical;min-height:140px}.feedback-form input:focus,.feedback-form select:focus,.feedback-form textarea:focus{outline:2px solid #efb178;outline-offset:1px}.feedback-note{margin:0;color:var(--muted);font-size:.9rem}.feedback-submit{justify-self:start;border:1px solid var(--brand);border-radius:999px;background:var(--brand);color:#fff;cursor:pointer;font:inherit;font-weight:700;padding:10px 18px}.feedback-submit:hover{background:var(--brand-strong)}.feedback-honey{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}footer{max-width:1080px;margin:0 auto;padding:20px 16px 30px;text-align:center;color:var(--muted);font-size:.9rem}footer a{color:var(--muted);text-decoration:none;margin:0 4px}footer a:hover{color:var(--brand-strong)}.ad-slot{height:0;overflow:hidden;border:0;border-radius:12px;background:#fff8ea}.ad-slot-inline{margin-top:0;height:0;display:flex;align-items:center;justify-content:center}.ad-slot-footer{max-width:1080px;margin:0 auto;height:0;display:flex;align-items:center;justify-content:center}.affiliate-panel{max-width:1080px;margin:0 auto;padding:18px 16px 0;display:grid;grid-template-columns:minmax(220px,.8fr) minmax(280px,1.2fr);gap:14px}.affiliate-panel h2{margin:6px 0 8px;font-size:1.15rem}.affiliate-panel p{margin:0;color:var(--muted);line-height:1.55;font-size:.92rem}.affiliate-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px}.affiliate-item{display:grid;gap:6px;min-height:96px;padding:14px;border:1px solid var(--line);border-radius:8px;background:#ffffffc7;color:var(--ink);text-decoration:none}.affiliate-item:hover{border-color:var(--brand);background:#fff}.affiliate-item span{color:var(--muted);font-size:.92rem;line-height:1.45}@media(max-width:600px){.drill .hanzi{font-size:2.4rem}.tone-answer{grid-template-columns:repeat(2,minmax(130px,1fr))}.tone-mark{font-size:2.7rem}h1{font-size:1.3rem}.affiliate-panel{grid-template-columns:1fr}}