:root{--ink:#17384d;--deep:#173f56;--green:#14776d;--mint:#e6f5f0;--paper:#fff;--bg:#f1f0ec;--line:#d5e1e3;--orange:#e8795b;--muted:#647b86;--shadow:0 10px 30px rgba(23,56,77,.09)}
*{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",Arial,sans-serif;background:var(--bg);line-height:1.5}
a{color:inherit;text-decoration:none;-webkit-tap-highlight-color:transparent}
button,input,audio{font:inherit}

.practice-main{max-width:980px;margin:0 auto;padding:22px 18px 60px}
.practice-tools{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.practice-tools a,.practice-tools button{border:0;border-radius:12px;padding:12px 16px;font-weight:800;text-decoration:none;cursor:pointer}
.practice-tools .open-pdf{background:#173f56;color:#fff}
.practice-tools .show-answer{background:#f2b84b;color:#2f250d}
.practice-tools .clear-answer{background:#f2f0eb;color:#4a4a4a}
.answer-sheet{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px}
.answer-field{background:#fff;border:1px solid #d9e0e3;border-radius:16px;padding:14px;box-shadow:0 5px 18px rgba(25,55,70,.06)}
.answer-field label{display:block;font-weight:900;color:#173f56;margin-bottom:8px}
.answer-field textarea{display:block;width:100%;min-height:86px;resize:vertical;border:2px solid #cad6db;border-radius:10px;padding:11px;font:inherit;line-height:1.5;box-sizing:border-box;background:#fffdf8}
.answer-field textarea:focus{outline:3px solid rgba(242,184,75,.35);border-color:#d49a26}
.save-state{color:#3f7555;font-weight:700;min-height:24px}
.reference-answer{margin-top:22px;background:#fff8df;border:1px solid #e8ce79;border-radius:16px;padding:18px;line-height:1.75;white-space:pre-wrap}
.reference-answer[hidden]{display:none}
.long-answer{grid-column:1/-1}
@media(max-width:680px){.answer-sheet{grid-template-columns:1fr}.answer-field textarea{min-height:76px}.practice-tools>*{flex:1 1 46%;text-align:center}.practice-main{padding:16px 12px 50px}}
.hero{background:linear-gradient(145deg,#173f56,#176f68);color:white;padding:calc(32px + env(safe-area-inset-top)) 20px 30px}
.hero>*{max-width:980px;margin-left:auto;margin-right:auto}
.eyebrow{font-size:12px;font-weight:850;letter-spacing:.12em;color:#8cd2c0}
.hero h1,.day-intro h1{font-size:clamp(29px,7vw,48px);line-height:1.15;margin:8px auto 10px}
.hero p{margin:0 auto;color:#dbece8;max-width:700px}
.progress-card{margin-top:22px!important;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);border-radius:16px;padding:14px 16px;backdrop-filter:blur(8px)}
.progress-track{height:8px;background:rgba(255,255,255,.2);border-radius:20px;margin-top:9px;overflow:hidden}
.progress-track span{display:block;width:0;height:100%;background:#ffd16b;border-radius:20px;transition:width .25s}
.home-main,.day-main{width:min(100%,1020px);margin:auto;padding:20px 16px 44px}
h2{font-size:20px;margin:0 0 10px}
.how{background:white;border-radius:18px;padding:18px;box-shadow:var(--shadow);margin-top:-2px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.steps div{background:var(--mint);border-radius:12px;padding:12px 8px;text-align:center;font-size:13px;font-weight:700}
.steps b{display:block;margin:auto auto 5px;width:27px;height:27px;line-height:27px;border-radius:50%;background:var(--green);color:white}
.help-entry{display:block;margin-top:14px;padding:12px 14px;border-radius:12px;background:#fff8f2;border:1px solid #f0d7cd;color:#b6533c;font-weight:800;text-align:center}
.section-head{display:flex;justify-content:space-between;align-items:center;margin:26px 2px 12px;gap:10px}
.text-btn{border:0;background:transparent;color:var(--green);padding:8px;font-size:13px}
.day-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.day-card{position:relative;background:white;border:1px solid transparent;border-radius:17px;padding:17px;min-height:154px;box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.day-card:active{transform:scale(.985)}
.day-card.done{border-color:#65af9d;background:#fbfffd}
.day-card .day-label{font-size:12px;font-weight:850;color:var(--green);letter-spacing:.08em}
.day-card h3{font-size:18px;line-height:1.3;margin:9px 0 7px}
.day-card p{font-size:13px;color:var(--muted);margin:0;padding-right:18px}
.done-mark{position:absolute;right:14px;top:14px;width:25px;height:25px;border-radius:50%;background:#dfe8ea;color:#8ca0a7;text-align:center;line-height:25px;font-weight:900}
.day-card.done .done-mark{background:#43a187;color:white}
footer{text-align:center;color:#70838c;font-size:12px;padding:0 18px calc(24px + env(safe-area-inset-bottom))}
.day-topbar{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:calc(12px + env(safe-area-inset-top)) 16px 12px;background:rgba(23,63,86,.96);color:white;font-size:13px;font-weight:750;backdrop-filter:blur(12px)}
.back{padding:5px 0}
.day-intro{background:linear-gradient(145deg,#e6f5f0,#f8fbfa);border-radius:20px;padding:22px;margin-bottom:16px;border:1px solid #cfe3df}
.day-intro .eyebrow{color:var(--green)}
.day-intro h1{font-size:clamp(27px,7vw,40px);margin-left:0}
.day-intro p{margin:0;color:var(--muted)}
.study-card{display:flex;gap:14px;background:white;border-radius:18px;padding:18px;margin:13px 0;box-shadow:var(--shadow);align-items:flex-start}
.study-card.compact{align-items:center}
.card-number{flex:0 0 38px;width:38px;height:38px;border-radius:12px;background:var(--deep);color:white;display:grid;place-items:center;font-size:13px;font-weight:900}
.grow{flex:1;min-width:0}
.study-card h2{margin:1px 0 4px;font-size:19px}
.study-card p{font-size:13px;color:var(--muted);margin:0 0 12px}
.primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;border-radius:12px;padding:11px 17px;font-weight:850;margin:8px 8px 0 0}
.primary-btn{background:var(--green);color:white}
.secondary-btn{background:var(--mint);color:var(--green);border:1px solid #c7e2da}
audio{display:block;width:100%;height:46px;margin-top:8px}
.extra-item{border-top:1px solid var(--line);padding:12px 0}
.extra-item:first-child{border-top:0}
.extra-item b{font-size:14px}
.complete-row{display:flex;align-items:center;gap:12px;background:#f4faf8;border:1px solid #d5e8e2;border-radius:12px;padding:13px;cursor:pointer}
.complete-row input{width:23px;height:23px;accent-color:var(--green);flex:0 0 auto}
.text-link{display:inline-block;color:var(--green);font-weight:750;font-size:13px;margin-top:12px;text-decoration:underline;text-underline-offset:3px}
.day-nav{display:grid;grid-template-columns:1fr 1fr 1fr;gap:9px;margin-top:18px;padding-bottom:env(safe-area-inset-bottom)}
.nav-btn{min-height:47px;display:grid;place-items:center;background:white;border:1px solid var(--line);border-radius:12px;font-weight:800;font-size:13px;text-align:center;padding:8px}
.nav-btn.center{background:var(--deep);color:white;border-color:var(--deep)}
.nav-btn.disabled{opacity:.38;pointer-events:none}
.hidden{display:none!important}
@media(max-width:680px){.steps{grid-template-columns:1fr 1fr}.day-grid{grid-template-columns:1fr}.day-card{min-height:132px}.study-card{padding:15px;gap:11px}.lesson-card{display:block}.lesson-card .card-number{margin-bottom:12px}.primary-btn,.secondary-btn{display:flex;width:100%;margin-right:0}.day-main{padding-left:12px;padding-right:12px}}
@media(min-width:681px) and (max-width:900px){.day-grid{grid-template-columns:1fr 1fr}.day-main{max-width:760px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}