:root {
  --bg: #0f1117;
  --panel: #171a23;
  --panel-2: #1e222e;
  --border: #2a2f3d;
  --text: #e6e8ee;
  --muted: #9aa3b2;
  --primary: #6c8cff;
  --primary-2: #5a78f0;
  --ok: #38d39f;
  --warn: #f5b14c;
  --err: #ff6b6b;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  max-width: 100%;
  overflow-x: hidden; /* 防止任何元素造成水平捲動 / 版面偏移 */
}

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 50% -10%, #1b2030 0%, var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", "Noto Sans TC", system-ui, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  overflow-wrap: break-word; /* 長字串自動換行,不撐破畫面 */
}

/* 表單/預格式元素不超出容器 */
input, button, textarea, pre { max-width: 100%; }

.wrap {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.hero { text-align: center; margin-bottom: 28px; }
.hero h1 { font-size: 1.9rem; margin: 0 0 6px; }
.sub { color: var(--muted); margin: 0; }

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  margin: 0 auto 24px;
  width: fit-content;
  max-width: 100%; /* 狀態文字很長時也不超出畫面 */
}
.dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--muted); flex: none;
}
.dot.ok { background: var(--ok); box-shadow: 0 0 10px var(--ok); }
.dot.warn { background: var(--warn); box-shadow: 0 0 10px var(--warn); }
.dot.err { background: var(--err); box-shadow: 0 0 10px var(--err); }

/* minmax(0,1fr) 讓欄位可縮到比內容還小,避免 input 的預設寬度把卡片撐出畫面 */
.cards { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
@media (max-width: 620px) { .cards { grid-template-columns: minmax(0, 1fr); } }

.card {
  min-width: 0; /* 允許卡片內容收縮,不被 input 等最小寬度撐爆 */
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.card h2 { margin: 0 0 4px; font-size: 1.15rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

button {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 10px 16px;
  transition: background .15s, transform .05s, border-color .15s;
}
button:active { transform: translateY(1px); }
.primary { background: var(--primary); color: #fff; }
.primary:hover { background: var(--primary-2); }
.primary:disabled { opacity: .55; cursor: not-allowed; }
.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.ghost:hover { background: var(--panel-2); }
button.small { padding: 4px 12px; font-size: .85rem; margin-left: auto; }

.room { margin-top: 16px; border-top: 1px dashed var(--border); padding-top: 16px; }
.code-row { display: flex; align-items: baseline; gap: 10px; }
.code {
  font-size: 1.8rem; letter-spacing: 4px; font-family: ui-monospace, "SF Mono", monospace;
  color: var(--primary);
}
.link-row { display: flex; gap: 8px; margin-top: 12px; }
.link {
  flex: 1; min-width: 0; background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; font-size: .85rem;
}

.join-row { display: flex; gap: 8px; }
.code-input {
  flex: 1; min-width: 0; text-transform: uppercase; letter-spacing: 6px; text-align: center;
  font-size: 1.4rem; font-family: ui-monospace, monospace;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 8px;
}
.code-input:focus { outline: none; border-color: var(--primary); }

.panel { margin-top: 20px; }
.drop {
  border: 2px dashed var(--border); border-radius: var(--radius);
  background: var(--panel); padding: 32px 20px; text-align: center;
  transition: border-color .15s, background .15s;
}
.drop.over { border-color: var(--primary); background: var(--panel-2); }
.drop p { margin: 6px 0; }

.transfers { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.transfer {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 14px;
}
.transfer.ok { border-color: var(--ok); }
.transfer.err { border-color: var(--err); }
.t-head { display: flex; gap: 10px; align-items: baseline; font-size: .9rem; }
.t-dir { color: var(--primary); flex: none; }
.t-name { flex: 1; min-width: 0; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.t-size { color: var(--muted); margin-left: auto; flex: none; }
.bar { height: 8px; background: var(--panel-2); border-radius: 999px; overflow: hidden; margin: 8px 0 6px; }
.bar-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--primary), var(--ok)); transition: width .12s; }
.transfer.ok .bar-fill { background: var(--ok); }
.t-status { font-size: .82rem; color: var(--muted); font-family: ui-monospace, monospace; }

.logbox { margin-top: 24px; }
.logbox summary { cursor: pointer; color: var(--muted); }
.log {
  background: #0b0d13; border: 1px solid var(--border); border-radius: 10px;
  padding: 12px; margin-top: 10px; max-height: 220px; overflow: auto;
  font-size: .78rem; font-family: ui-monospace, monospace; color: #b9c2d4;
  white-space: pre-wrap; overflow-wrap: anywhere; /* 長雜湊等不換行的字也能斷行 */
}

.foot { margin-top: 32px; text-align: center; color: var(--muted); font-size: .8rem; }

/* 小螢幕(手機):縮小間距與字級、收斂字距,確保置中且不超出畫面 */
@media (max-width: 480px) {
  .wrap { padding: 24px 14px 56px; }
  .hero h1 { font-size: 1.5rem; }
  .status { padding: 8px 14px; font-size: .95rem; }
  .card { padding: 16px; }
  .code { font-size: 1.5rem; letter-spacing: 2px; }
  .code-input { font-size: 1.15rem; letter-spacing: 4px; }
  .drop { padding: 24px 14px; }
}