:root {
  --primary: #3b6ef5;
  --primary-dark: #2a56d0;
  --primary-soft: #eef3ff;
  --bg: #f5f6fa;
  --surface: #ffffff;
  --border: #e4e8f0;
  --border-strong: #cfd6e4;
  --text: #1b1f27;
  --text-2: #454c59;
  --muted: #838c9c;
  --success: #0f9d58;
  --success-soft: #e9f7ef;
  --danger: #e0483c;
  --danger-soft: #fdecea;
  --warn: #b26a00;
  --warn-soft: #fff5e5;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(20, 30, 60, .04), 0 6px 20px rgba(20, 30, 60, .05);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--primary); text-decoration: none; }

/* ---------------- 顶栏 ---------------- */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; color: inherit; }
.brand img { width: 34px; height: 34px; object-fit: contain; border-radius: 8px; }
.brand .bt { display: flex; flex-direction: column; line-height: 1.25; }
.brand strong { font-size: 15px; letter-spacing: .3px; }
.brand em { font-size: 11px; color: var(--muted); font-style: normal; }

/* ---------------- 布局 ---------------- */
.wrap { max-width: 860px; margin: 0 auto; padding: 20px 16px 40px; }

.hero { text-align: center; padding: 14px 0 18px; }
.hero h1 { font-size: 22px; margin: 0 0 8px; letter-spacing: .3px; }
.hero p { margin: 0; color: var(--muted); font-size: 13.5px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 12px; }
.chip {
  font-size: 12px; color: var(--text-2);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; padding: 4px 12px;
}

/* ---------------- 功能卡 ---------------- */
.tools {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px; margin-bottom: 16px;
}
.tool {
  display: flex; align-items: center; gap: 10px;
  padding: 12px; text-align: left;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer;
  font-family: inherit; font-size: 13.5px; color: var(--text);
  transition: border-color .16s, background .16s, transform .1s;
}
.tool:hover { border-color: var(--border-strong); }
.tool:active { transform: scale(.985); }
.tool .ico { flex: 0 0 30px; width: 30px; height: 30px; color: var(--primary); }
.tool .ico svg { width: 100%; height: 100%; }
.tool .tx { display: flex; flex-direction: column; min-width: 0; }
.tool .tx b { font-weight: 600; font-size: 13.5px; }
.tool .tx span { font-size: 11.5px; color: var(--muted); }
.tool.on {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 2px rgba(59, 110, 245, .12);
}

/* ---------------- 卡片 / 上传 ---------------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px; margin-bottom: 16px;
}
.drop {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 26px 16px; text-align: center; cursor: pointer;
  border: 1.5px dashed var(--border-strong); border-radius: var(--radius);
  color: var(--text-2); transition: border-color .16s, background .16s;
}
.drop:hover, .drop.over { border-color: var(--primary); background: var(--primary-soft); }
.drop b { font-size: 14px; color: var(--text); }
.drop span { font-size: 12px; color: var(--muted); }
.drop-ico {
  width: 34px; height: 34px; margin-bottom: 2px;
  border: 2px solid var(--primary); border-radius: 9px; position: relative; opacity: .85;
}
.drop-ico::after {
  content: ""; position: absolute; left: 50%; top: 50%;
  width: 14px; height: 2px; background: var(--primary);
  transform: translate(-50%, -50%);
}
.drop-ico::before {
  content: ""; position: absolute; left: 50%; top: 50%;
  width: 2px; height: 14px; background: var(--primary);
  transform: translate(-50%, -50%);
}

.files { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; }
.fitem {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px; background: var(--bg);
  border-radius: var(--radius-sm); font-size: 12.5px;
}
.fitem .n { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fitem .s { color: var(--muted); font-size: 11.5px; flex: 0 0 auto; }
.fitem .x {
  border: none; background: transparent; color: var(--muted);
  cursor: pointer; font-size: 15px; line-height: 1; padding: 0 2px;
}
.fitem .x:hover { color: var(--danger); }

/* ---------------- 参数 ---------------- */
.opts { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.opts:empty { display: none; }
.fld { display: flex; flex-direction: column; gap: 5px; }
.fld label { font-size: 12.5px; color: var(--text-2); font-weight: 600; }
.fld .hint { font-size: 11.5px; color: var(--muted); }
.fld select, .fld input[type="text"], .fld input[type="number"] {
  padding: 8px 10px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 13px; background: var(--surface); color: var(--text);
}
.fld input[type="range"] { width: 100%; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-sm); cursor: pointer;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  font-family: inherit; font-size: 13.5px; transition: background .16s, border-color .16s, opacity .16s;
}
.btn:hover { border-color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn.ghost { border-color: transparent; color: var(--primary); }
.btn.ghost:hover { background: var(--primary-soft); }
.btn.big { width: 100%; padding: 11px 18px; font-size: 14.5px; font-weight: 600; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--border-strong); background: var(--surface); }
.btn.primary:disabled:hover { background: var(--primary); border-color: var(--primary); }

.runline { display: flex; gap: 10px; margin-top: 14px; align-items: center; }
.runline .btn.big { flex: 1; }

.note { margin-top: 10px; font-size: 12px; color: var(--muted); }
.note.err { color: var(--danger); }
.note.warn { color: var(--warn); }

/* ---------------- 结果 ---------------- */
.result-head { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.result-head b { font-size: 14px; }
.ok-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--success);
  box-shadow: 0 0 0 3px rgba(15, 157, 88, .14);
}
.rrow {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 11px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  margin-bottom: 7px; background: var(--surface);
}
.rrow .n { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.rrow .m { color: var(--muted); font-size: 11.5px; flex: 0 0 auto; }
.rrow a.dl {
  flex: 0 0 auto; padding: 5px 12px; border-radius: var(--radius-sm);
  background: var(--primary); color: #fff; font-size: 12.5px;
}
.txtout {
  max-height: 300px; overflow: auto; margin-top: 10px;
  padding: 12px; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 12.5px;
  white-space: pre-wrap; word-break: break-word;
  font-family: "Consolas", "Menlo", monospace;
}
.copybar { display: flex; justify-content: flex-end; margin-top: 8px; }

/* ---------------- 引流区 ---------------- */
.promo {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  background: linear-gradient(180deg, #fff 0%, var(--primary-soft) 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; margin-bottom: 16px;
}
.promo-main { flex: 1; min-width: 200px; }
.promo-main h2 { font-size: 16px; margin: 0 0 6px; }
.promo-main p { margin: 0 0 12px; color: var(--text-2); font-size: 13px; }
.promo-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.promo-qr { text-align: center; }
.promo-qr img { width: 116px; height: 116px; object-fit: contain; border-radius: 10px; background: #fff; padding: 4px; }
.promo-qr span { display: block; font-size: 11.5px; color: var(--muted); margin-top: 6px; }

/* ---------------- FAQ ---------------- */
.faq h2 { font-size: 16px; margin: 0 0 12px; }
.faq details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 11px 14px; margin-bottom: 8px;
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 13.5px; }
.faq details p { margin: 8px 0 0; color: var(--text-2); font-size: 13px; }

.foot {
  display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  padding: 18px 16px 30px; color: var(--muted); font-size: 11.5px;
  max-width: 860px; margin: 0 auto;
}

/* ---------------- 加载中 ---------------- */
.spin {
  width: 15px; height: 15px; border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, .4); border-top-color: #fff;
  animation: sp .7s linear infinite;
}
@keyframes sp { to { transform: rotate(360deg); } }

/* ---------------- 桌面 ---------------- */
@media (min-width: 640px) {
  .tools { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero h1 { font-size: 26px; }
  .wrap { padding: 28px 24px 50px; }
}