:root{
  --teal:#0d9488; --teal-d:#0b7c72; --teal-l:#e6f7f4;
  --ink:#1f2a2a; --mut:#5c6b6b; --line:#e3ecec;
  --bg:#f7faf9; --card:#ffffff; --amber:#b7791f;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.7 -apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
a{color:var(--teal-d)}
h1,h2,h3{line-height:1.4}

/* nav */
.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-size:22px;font-weight:800;color:var(--teal-d);text-decoration:none;letter-spacing:2px}
.nav nav a{margin-left:22px;text-decoration:none;color:var(--ink);font-size:15px}
.nav nav a:hover{color:var(--teal-d)}
.donate-link{color:#b7791f !important;font-weight:700}
.lang-link{border:1px solid var(--line);border-radius:20px;padding:3px 14px !important;font-size:13px !important;color:var(--teal-d) !important;white-space:nowrap}

/* hero */
.hero{background:linear-gradient(135deg,#0d9488,#0a6e66);color:#fff;padding:52px 0 44px;text-align:center}
.hero h1{margin:0 0 10px;font-size:34px;letter-spacing:1px}
.hero h1 span{font-weight:400;font-size:20px;opacity:.92}
.hero .sub{margin:0;opacity:.88;font-size:15px}
.hero .cta{margin-top:22px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* buttons */
.btn{display:inline-block;border:1px solid var(--teal);background:#fff;color:var(--teal-d);
  padding:9px 20px;border-radius:8px;font-size:15px;cursor:pointer;text-decoration:none;transition:.15s}
.btn:hover{background:var(--teal-l)}
.btn.primary{background:var(--teal);color:#fff;border-color:var(--teal)}
.btn.primary:hover{background:var(--teal-d)}
.btn.big{font-size:17px;padding:12px 44px;margin-top:8px}
.btn:disabled{opacity:.55;cursor:default}
.btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.btn.ghost:hover{background:rgba(255,255,255,.12)}

/* tool card */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;margin:28px 0;box-shadow:0 2px 14px rgba(13,148,136,.06)}
.tabs{display:flex;gap:8px;margin-bottom:20px}
.tab{flex:1;border:1px solid var(--line);background:#f2f6f6;padding:12px;border-radius:10px;font-size:16px;cursor:pointer;color:var(--mut)}
.tab.active{background:var(--teal);border-color:var(--teal);color:#fff;font-weight:700}
.panel h3{margin:22px 0 10px;font-size:16px}
.panel h3 small{color:var(--mut);font-weight:400}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.preview img{max-width:100%;max-height:260px;border-radius:8px;border:1px solid var(--line);margin-top:10px}
.muted{color:var(--mut);font-size:14px}
.filelist{list-style:none;margin:10px 0;padding:0}
.filelist li{display:flex;align-items:center;gap:12px;padding:9px 12px;border:1px solid var(--line);border-radius:8px;margin-bottom:8px;background:#fbfdfd;flex-wrap:wrap}
.fname{flex:1;min-width:140px;word-break:break-all;font-weight:600}
.fsize{color:var(--mut);font-size:13px}
.mini{border:1px solid var(--line);background:#fff;border-radius:6px;padding:4px 12px;font-size:13px;cursor:pointer;color:var(--teal-d);text-decoration:none}
.mini:hover{background:var(--teal-l)}
.thumb{max-height:90px;border-radius:6px;border:1px solid var(--line)}
.field{display:block;margin:10px 0;font-size:15px}
.field input{width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:15px}
.badge{display:inline-block;background:#fdf3e3;color:var(--amber);border:1px solid #f0dcae;font-size:12px;border-radius:20px;padding:1px 10px;margin-left:6px;vertical-align:2px}
.tip{margin-top:12px;font-size:14px;min-height:22px}
.tip.err{color:#c0392b}.tip.ok{color:var(--teal-d)}
.result{margin-top:16px;padding:16px;border:1px dashed var(--teal);border-radius:10px;background:var(--teal-l)}
.result img{max-width:100%;max-height:280px;border-radius:8px}

/* feature cards */
.feats{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:8px 0 34px}
.feat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}
.feat h3{margin:0 0 8px;font-size:17px;color:var(--teal-d)}
.feat p{margin:0;color:var(--mut);font-size:14px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:10px 0 34px;counter-reset:st}
.step{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;position:relative}
.step::before{counter-increment:st;content:counter(st);display:inline-block;width:28px;height:28px;line-height:28px;text-align:center;
  background:var(--teal);color:#fff;border-radius:50%;font-weight:700;margin-bottom:8px}
.step h4{margin:6px 0;font-size:15px}
.step p{margin:0;font-size:13px;color:var(--mut)}

/* content pages */
.page{padding:34px 0}
.page h2{font-size:24px;margin:6px 0 14px}
.page h3{margin:26px 0 8px;color:var(--teal-d);font-size:18px}
.page p,.page li{color:#334141}
.page ul{padding-left:20px}
.warn{background:#fff8e8;border:1px solid #f0dcae;border-radius:10px;padding:14px 18px;margin:18px 0;font-size:14px}
.note{background:var(--teal-l);border-radius:10px;padding:14px 18px;margin:18px 0;font-size:14px}
code{background:#eef4f4;padding:1px 7px;border-radius:5px;font-size:14px}

/* faq */
details{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:10px;padding:14px 18px}
summary{cursor:pointer;font-weight:700;font-size:15px}
details p{margin:8px 0 2px;color:var(--mut);font-size:14px}

/* pro */
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:20px 0}
.plan{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px;text-align:center;position:relative}
.plan.hot{border:2px solid var(--teal)}
.plan .pname{font-size:17px;font-weight:700}
.plan .price{font-size:30px;color:var(--teal-d);margin:10px 0;font-weight:800}
.plan .price small{font-size:13px;color:var(--mut);font-weight:400}
.plan ul{list-style:none;padding:0;margin:14px 0;text-align:left;font-size:14px;color:var(--mut)}
.plan li{margin:6px 0}
.plan li::before{content:"✓ ";color:var(--teal)}
.soon{position:absolute;top:-12px;right:14px;background:var(--amber);color:#fff;font-size:12px;padding:2px 12px;border-radius:12px}
table.cmp{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;font-size:14px;margin:16px 0}
table.cmp th,table.cmp td{border:1px solid var(--line);padding:10px 14px;text-align:center}
table.cmp th{background:var(--teal-l)}
table.cmp td:first-child,table.cmp th:first-child{text-align:left}

/* footer */
footer{background:#fff;border-top:1px solid var(--line);margin-top:40px;padding:26px 0;color:var(--mut);font-size:13px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer nav a{margin-right:16px;color:var(--mut);text-decoration:none;font-size:13px}

@media(max-width:640px){
  .hero h1{font-size:26px}
  .card{padding:18px}
  .nav nav a{margin-left:12px;font-size:14px}
}
.lang-sel{border:1px solid var(--line);border-radius:20px;padding:3px 10px;font-size:13px;color:var(--teal-d);background:#fff;white-space:nowrap;cursor:pointer;max-width:110px}