:root {
  --bg: #f4f5fa;
  --bg-soft: #eef0f8;
  --card: #ffffff;
  --line: #e6e8f2;
  --text: #1f2333;
  --sub: #8a90a6;
  --accent: #2f6bff;
  --accent-2: #1e54d8;
  --accent-soft: #eef2ff;
  --accent-soft-line: #dbe3ff;
  --ok: #16a34a;
  --bad: #e5484d;
  --input: #fbfbfe;
  --shadow: rgba(20, 30, 60, .06);
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-soft: #171a24;
  --card: #181b26;
  --line: #262b3a;
  --text: #e7e9f0;
  --sub: #8b91a6;
  --accent: #4c82ff;
  --accent-2: #6b98ff;
  --accent-soft: #1c2440;
  --accent-soft-line: #2a3560;
  --ok: #34d07f;
  --bad: #ff6b6f;
  --input: #12151f;
  --shadow: rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  transition: background .2s, color .2s;
}

.app {
  max-width: 520px;
  margin: 0 auto;
  padding: 18px 16px calc(40px + env(safe-area-inset-bottom));
}

/* ---------- header ---------- */
header { margin-bottom: 16px; }
.topbar { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 9px; }
.logo {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(160deg, var(--accent), var(--accent-2));
  color: #fff; font-size: 17px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 10px rgba(47, 107, 255, .3);
}
header h1 { font-size: 19px; margin: 0; letter-spacing: .4px; }

.icon-btn {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  width: 38px; height: 38px;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}

.ip {
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--sub);
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-line);
  border-radius: 999px;
  padding: 6px 13px;
  display: inline-block;
}
.ip b { color: var(--accent-2); font-weight: 600; }

/* ---------- card ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 15px;
  padding: 16px;
  margin-bottom: 13px;
  box-shadow: 0 1px 3px var(--shadow);
}

.field { margin-bottom: 14px; }
.field:last-of-type { margin-bottom: 0; }
.field label, .card > summary {
  display: block;
  font-size: 13px;
  color: var(--sub);
  margin-bottom: 8px;
}

.row { display: flex; gap: 10px; }

input, textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--input);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 12px;
  outline: none;
  transition: border-color .15s, box-shadow .15s, background .2s;
}
input::placeholder, textarea::placeholder { color: var(--sub); opacity: .8; }
input:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}
textarea { resize: vertical; font-size: 13.5px; letter-spacing: .3px; min-height: 96px; }

button {
  font: inherit;
  border: none;
  border-radius: 11px;
  padding: 12px 16px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .06s, background .15s, opacity .15s;
}
button:active:not(:disabled) { transform: scale(.975); }
button:disabled { opacity: .5; cursor: not-allowed; }

#btnSend {
  background: var(--accent-soft);
  color: var(--accent-2);
  border: 1px solid var(--accent-soft-line);
  font-weight: 600;
  min-width: 108px;
}

button.primary {
  display: block;
  width: 100%;
  background: linear-gradient(160deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 600;
  font-size: 16px;
  padding: 15px;
  margin-bottom: 10px;
  box-shadow: 0 8px 20px rgba(47, 107, 255, .28);
}
button.primary:hover:not(:disabled) { filter: brightness(1.06); }

button.ghost {
  display: block;
  width: 100%;
  background: transparent;
  color: var(--sub);
  border: 1px dashed var(--line);
  padding: 12px;
  margin-bottom: 15px;
}

button.link {
  background: none;
  border: none;
  color: var(--accent-2);
  padding: 4px 2px;
  font-size: 13px;
}

.hint { font-size: 12.5px; margin: 10px 2px 0; min-height: 18px; color: var(--sub); }
.hint.good { color: var(--ok); }
.hint.bad { color: var(--bad); }

/* ---------- details / summary ---------- */
details.card > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
details.card > summary::-webkit-details-marker { display: none; }
details.card[open] > summary { margin-bottom: 12px; }
details.card > summary::after {
  content: "▾";
  margin-left: auto;
  color: var(--sub);
  transition: transform .2s;
}
details.card[open] > summary::after { transform: rotate(180deg); }

.badge {
  background: var(--accent-soft);
  color: var(--accent-2);
  border-radius: 999px;
  font-size: 11.5px;
  padding: 2px 8px;
  font-weight: 600;
}
.badge:empty { display: none; }

.mini { display: flex; gap: 16px; margin-top: 8px; }

/* ---------- progress ---------- */
.progress {
  height: 4px;
  background: var(--bg-soft);
  border-radius: 999px;
  overflow: hidden;
  margin: 0 2px 15px;
  opacity: 0;
  transition: opacity .2s;
}
.progress.show { opacity: 1; }
#progressBar {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .3s ease;
}

/* ---------- results ---------- */
.results-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--sub);
  margin-bottom: 10px;
}
#results { list-style: none; margin: 0; padding: 0; }
#results:empty::after {
  content: "还没有结果";
  font-size: 13px;
  color: var(--sub);
  opacity: .7;
}
#results li {
  font-size: 13.5px;
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 7px;
  background: var(--bg-soft);
  border-left: 3px solid var(--line);
  word-break: break-all;
  animation: pop .18s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; } }
#results li.ok { border-left-color: var(--ok); }
#results li.err { border-left-color: var(--bad); }

footer {
  text-align: center;
  font-size: 12px;
  color: var(--sub);
  margin-top: 20px;
  line-height: 1.8;
  opacity: .85;
}