:root{--ink:#19324a;--muted:#6d8192;--blue:#2878dc;--sky:#eaf5ff;--green:#3aa879;--yellow:#ffc857;--line:#e2edf4;--card:#fff}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:#f7fbfd;color:var(--ink);font-family:Aptos,Noto Sans SC,system-ui,sans-serif}a{color:inherit;text-decoration:none}button{font:inherit}input{display:block;width:100%;margin-top:7px;padding:12px 13px;border:1px solid var(--line);border-radius:10px;color:var(--ink);background:#fff}.site-header{background:#fff;border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:5}.header-inner{max-width:1080px;margin:auto;padding:14px 20px;justify-content:space-between}.brand,.header-inner{display:flex;align-items:center}.brand{gap:10px;font-weight:800;font-size:19px}.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:linear-gradient(135deg,#52b9f4,#377fe7);color:#fff}.header-link{color:var(--muted);font-size:14px}.container{max-width:1080px;margin:auto;padding:28px 20px 56px}.hero{background:linear-gradient(120deg,#eaf7ff,#f3fff8);border:1px solid #d9edf5;border-radius:28px;padding:40px 34px;display:grid;grid-template-columns:1.3fr .7fr;grid-gap:24px;gap:24px;overflow:hidden}.hero h1{font-size:clamp(32px,6vw,56px);line-height:1.1;margin:0 0 14px;letter-spacing:-1px}.hero p{margin:0;color:#557083;font-size:18px;line-height:1.7}.hero-art{display:grid;place-items:center;font-size:88px;transform:rotate(4deg)}.section-title{margin:34px 0 16px;display:flex;align-items:end;justify-content:space-between}.section-title h2{margin:0;font-size:24px}.section-title span{color:var(--muted);font-size:14px}.grade-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:14px;gap:14px}.grade-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:20px;min-height:170px;box-shadow:0 8px 20px rgba(50,100,130,.05);transition:transform .18s,box-shadow .18s}.grade-card:hover{transform:translateY(-3px);box-shadow:0 12px 26px rgba(50,100,130,.11)}.grade-icon{font-size:30px}.grade-card h3{margin:12px 0 4px;font-size:20px}.grade-card p{margin:0 0 16px;color:var(--muted);font-size:13px}.term-row{display:flex;gap:8px}.pill{background:#eef6ff;color:#2878dc;border-radius:999px;padding:7px 11px;font-size:13px;font-weight:700}.page-head{margin-bottom:22px}.eyebrow{color:var(--blue);font-size:14px;font-weight:700;margin:0 0 8px}.page-head h1{margin:0;font-size:32px}.back{color:var(--muted);font-size:14px;display:inline-block;margin-bottom:18px}.unit-grid,.word-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:14px;gap:14px}.panel,.unit-card,.word-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.unit-card{display:flex;justify-content:space-between;align-items:center}.unit-card h3,.word-card h3{margin:0 0 7px}.unit-card p,.word-card p{color:var(--muted);margin:0;font-size:14px}.arrow{color:var(--blue);font-size:22px}.word-card{min-height:135px;display:flex;flex-direction:column;justify-content:space-between}.word-card .ipa{color:var(--blue);font-size:14px}.learn-layout{display:grid;grid-template-columns:1fr 1fr;grid-gap:18px;gap:18px}.word-hero{background:linear-gradient(145deg,#eaf6ff,#eefcf5);border-radius:24px;padding:28px;min-height:330px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}.word-hero h1{margin:8px 0;font-size:clamp(48px,9vw,78px);letter-spacing:-2px}.ipa-large{color:#2878dc;font-size:20px}.meaning{color:#557083;font-size:20px}.sound-button{border:0;background:#2878dc;color:#fff;border-radius:999px;padding:14px 24px;cursor:pointer;margin-top:18px;box-shadow:0 8px 16px rgba(40,120,220,.24)}.info-title{margin:0 0 12px;font-size:18px}.video-box{background:#10283b;color:#cde5f3;border-radius:14px;min-height:180px;display:grid;place-items:center;text-align:center;padding:20px}.memory{background:#fff8dd;border-radius:14px;padding:16px;line-height:1.7}.nav-row{display:flex;gap:10px;margin-top:18px}.nav-button{border:1px solid var(--line);background:#fff;border-radius:12px;padding:11px 15px;color:var(--ink)}.footer{border-top:1px solid var(--line);color:var(--muted);font-size:13px;text-align:center;padding:22px 20px}.admin-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:14px;gap:14px}.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.stat strong{display:block;font-size:30px;margin-top:8px}.admin-editor{display:grid;grid-template-columns:1fr 1fr;grid-gap:14px;gap:14px;margin-top:18px}.editor-form{display:grid;grid-gap:12px;gap:12px;margin-top:14px}.editor-form label{font-size:14px;color:var(--muted)}.editor-form select,.editor-form textarea{display:block;width:100%;margin-top:7px;padding:12px 13px;border:1px solid var(--line);border-radius:10px;color:var(--ink);background:#fff}.editor-form textarea{min-height:90px;resize:vertical}.pill-button{border:0;background:#2878dc;color:#fff;border-radius:999px;padding:11px 16px;cursor:pointer;width:max-content}.editor-message{grid-column:1/-1;color:var(--green);margin:0}@media (max-width:720px){.hero{grid-template-columns:1fr;padding:28px 22px}.hero-art{font-size:64px}.grade-grid{grid-template-columns:repeat(2,1fr)}.admin-grid,.learn-layout,.unit-grid,.word-grid{grid-template-columns:1fr}.container{padding:22px 16px 42px}.header-inner{padding:12px 16px}.admin-editor{grid-template-columns:1fr}}