*{margin:0;padding:0;box-sizing:border-box}
:root{
  --accent:#8b5cf6;--accent-dark:#7c3aed;
  --bg:#fafafa;--card:#fff;--border:#e5e5e5;
  --text:#111;--muted:#888;
  --ok:#22c55e;--warn:#f59e0b;--bad:#ef4444;
}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5}

/* ---- header / nav (mirrors godfengliang's clean bar) ---- */
header{position:sticky;top:0;z-index:50;padding:14px 24px;background:#fff;border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{display:flex;flex-direction:column;line-height:1.2}
.brand h1{font-size:18px;font-weight:700}
.brand h1 span{color:var(--accent)}
.brand .tagline{font-size:12px;color:var(--muted);margin-top:2px}
nav.topnav{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.nav-link{font-size:13px;color:var(--muted);text-decoration:none;padding:6px 10px}
.nav-link:hover{color:var(--text)}
.lang-switch{display:flex;border:1px solid var(--border);border-radius:8px;overflow:hidden}
.lang-switch button{background:#fff;border:none;padding:6px 12px;font-size:13px;cursor:pointer;color:var(--muted)}
.lang-switch button.active{background:var(--accent);color:#fff}
.btn{padding:8px 18px;border-radius:8px;border:none;font-size:14px;font-weight:600;cursor:pointer;transition:all .15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed}
.btn-secondary{background:#f5f5f5;color:#333;border:1px solid var(--border)}
.btn-secondary:hover{background:#eee}
.btn-pro{background:#111;color:#fff}
.btn-pro:hover{background:#000}

main{max-width:920px;margin:32px auto;padding:0 20px}
.hero{text-align:center;margin-bottom:28px}
.hero h2{font-size:28px;font-weight:700;margin-bottom:8px}
.hero p{color:var(--muted);font-size:15px}

/* 上传区：左侧斜向半透明图片水印 + 文字浮于上层（参考 Google Drive / 阿里云 / 腾讯云 上传组件） */
.drop-zone{position:relative;overflow:hidden;border:2px dashed #d4d4d4;border-radius:12px;padding:56px 48px;cursor:pointer;transition:all .2s;background:#fff;display:flex;align-items:center;justify-content:center}
.drop-zone:hover,.drop-zone.dragover{border-color:var(--accent);background:#f5f3ff}
/* 装饰层：铺满虚线框、整体旋转 -30° 形成斜向水印纹理，右侧渐隐让文字区干净 */
.drop-deco{position:absolute;top:-50%;left:-50%;width:200%;height:200%;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='58' height='58' viewBox='0 0 24 24' fill='none' stroke='%238b5cf6' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='18' rx='3'/%3E%3Ccircle cx='8.5' cy='8.5' r='1.8'/%3E%3Cpath d='M21 15l-5-5L5 21'/%3E%3C/svg%3E");
  background-repeat:repeat;background-size:104px 104px;transform:rotate(-30deg);opacity:.07;
  pointer-events:none;
  -webkit-mask-image:linear-gradient(to right,#000 0,#000 40%,transparent 70%);
  mask-image:linear-gradient(to right,#000 0,#000 40%,transparent 70%)}
.drop-content{position:relative;z-index:1;width:100%;text-align:center}
.drop-zone h3{font-size:18px;margin-bottom:6px;color:#333}
.drop-zone p{font-size:13px;color:#999}

.controls{display:none;margin-top:24px;background:#fff;border-radius:12px;padding:20px;border:1px solid var(--border)}
.controls.active{display:block}
.preview-row{display:flex;gap:20px;align-items:flex-start;flex-wrap:wrap}
.preview-box{flex:1;min-width:250px;text-align:center}
.preview-box img{max-width:100%;max-height:300px;border-radius:8px;border:1px solid var(--border)}
.preview-box .label{font-size:13px;color:#888;margin-top:8px;margin-bottom:14px;font-weight:600;letter-spacing:.6px;text-transform:uppercase}
.preview-box .size{font-size:20px;font-weight:700;margin-top:4px}
.size.ok{color:var(--ok)}.size.warn{color:var(--warn)}.size.bad{color:var(--bad)}

.settings{margin-top:20px;display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.target-group{display:flex;align-items:center;gap:8px}
.target-group label{font-size:13px;font-weight:600;white-space:nowrap}
.target-group input{width:110px;padding:6px 10px;border:1px solid #d4d4d4;border-radius:6px;font-size:14px;font-weight:600}
.target-group select{padding:6px 8px;border:1px solid #d4d4d4;border-radius:6px;font-size:13px;background:#fff}
.result-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.savings{display:inline-block;background:#dcfce7;color:#166534;padding:4px 12px;border-radius:20px;font-size:13px;font-weight:600}
.note{font-size:13px;color:var(--muted);margin-top:14px}
.note.ok{color:var(--ok)}
.msg{font-size:13px;color:var(--bad);margin-top:12px;min-height:16px}
.msg.ok{color:var(--ok)}

.batch-area{margin-top:24px;background:#fff;border-radius:12px;padding:20px;border:1px solid var(--border)}
.batch-area h3{font-size:14px;margin-bottom:12px}
.batch-list{list-style:none}
.batch-list li{display:flex;align-items:center;gap:12px;padding:8px 0;border-bottom:1px solid #f5f5f5;font-size:13px}
.batch-list li .fname{flex:1;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.batch-list li .orig{color:#888}.batch-list li .comp{color:var(--ok);font-weight:600}
.batch-list li .status{font-size:12px;padding:2px 8px;border-radius:10px;background:#dcfce7;color:#166534}

.features{margin-top:40px;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.feature-card{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px}
.feature-card h4{font-size:15px;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.lock{font-size:10px;font-weight:700;color:#fff;background:var(--accent);border-radius:6px;padding:1px 6px;letter-spacing:.5px}
.feature-card p{font-size:13px;color:var(--muted);line-height:1.6}

/* ---- pricing modal ---- */
.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.45);display:none;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal-backdrop.active{display:flex}
.modal{background:#fff;border-radius:16px;max-width:560px;width:100%;padding:28px;max-height:90vh;overflow:auto;position:relative}
.modal-close{position:absolute;top:14px;right:18px;border:none;background:none;font-size:22px;cursor:pointer;color:var(--muted);line-height:1}
.modal h3{font-size:20px;margin-bottom:6px}
.modal .sub{color:var(--muted);font-size:13px;margin-bottom:18px}
.plan{display:flex;gap:14px;flex-wrap:wrap}
.plan-card{flex:1;min-width:200px;border:1px solid var(--border);border-radius:12px;padding:18px}
.plan-card.pro{border-color:var(--accent);box-shadow:0 0 0 2px rgba(139,92,246,.15)}
.plan-card .name{font-size:16px;font-weight:700}
.plan-card .price{font-size:24px;font-weight:800;margin:8px 0}
.plan-card ul{list-style:none;font-size:13px;color:#444;line-height:1.9}
.plan-card li::before{content:'✓';color:var(--ok);margin-right:8px;font-weight:700}
.pay-row{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}
.pay-btn{flex:1;min-width:110px;padding:10px;border:1px solid var(--border);border-radius:8px;background:#fff;cursor:pointer;font-size:13px;font-weight:600;text-decoration:none;color:#111;text-align:center}
.pay-btn:hover{background:#f5f5f5}
.key-row{display:flex;gap:8px;margin-top:14px;border-top:1px solid var(--border);padding-top:14px}
.key-row input{flex:1;padding:8px 10px;border:1px solid #d4d4d4;border-radius:6px;font-size:14px}
.key-msg{font-size:13px;margin-top:8px;min-height:16px}
.key-msg.ok{color:var(--ok)}.key-msg.err{color:var(--bad)}
.btn-sponsor{width:100%;margin-top:14px;font-size:15px;padding:12px 16px}
.sponsor-channels{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.sponsor-channels .pay-btn{flex:1;min-width:110px}

footer{text-align:center;color:var(--muted);font-size:12px;padding:30px 20px}