/* SanYue Studio 官网公共样式 —— 深空底+电光蓝/琥珀,参考 usb 站的分寸感 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #0a0d12;
  --panel: rgba(255, 255, 255, .04);
  --line: rgba(255, 255, 255, .13);
  --line-soft: rgba(255, 255, 255, .07);
  --muted: rgba(255, 255, 255, .62);
  --dim: rgba(255, 255, 255, .4);
  --blue: #4d8dff;
  --amber: #f0a530;
  --red: #e36a5e;
  --green: #5cb884;
  --num: Bahnschrift, "DIN Alternate", ui-sans-serif, sans-serif;
  --han: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { background: var(--bg); color: #fff; font: 16px/1.8 var(--han); overflow-x: hidden;
  -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* 顶栏 */
.nav { position: relative; z-index: 30; display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; }
@media (min-width: 1024px) { .nav { padding: 20px 56px; } }
.nav-l { display: flex; align-items: center; gap: 36px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 600; white-space: nowrap; }
.logo img { width: 26px; height: 26px; }
.links { display: none; gap: 28px; }
@media (min-width: 820px) { .links { display: flex; } }
.links a, .links button { font: 14px/1.5 var(--han); color: rgba(255, 255, 255, .8); background: none;
  border: 0; cursor: pointer; white-space: nowrap; transition: color .2s; }
.links a:hover, .links button:hover { color: #fff; }
.talk { border: 0; border-radius: 8px; background: #fff; color: #000; padding: 9px 20px;
  font: 500 14px/1.5 var(--han); cursor: pointer; transition: transform .2s; white-space: nowrap; }
.talk:hover { transform: scale(1.05); }

/* 按钮 */
.btn { display: inline-block; border: 0; border-radius: 9px; background: var(--blue); color: #fff;
  padding: 12px 30px; font: 600 16px/1.5 var(--han); cursor: pointer; transition: filter .2s, transform .2s; }
.btn:hover { filter: brightness(1.12); transform: translateY(-1px); }
.btn:disabled { opacity: .5; cursor: default; transform: none; }
.btn.ghost { background: transparent; border: 1px solid var(--line); color: #fff; font-weight: 400; }
.btn.sm { padding: 7px 18px; font-size: 14px; }

/* 区块 */
section { padding: 84px 0; }
.sec-tag { color: var(--amber); font: 600 13px/1 var(--han); letter-spacing: .14em; margin-bottom: 14px; }
h2.sec-t { font-size: clamp(26px, 4vw, 36px); line-height: 1.4; font-weight: 700; margin-bottom: 14px; }
.sec-d { color: var(--muted); max-width: 640px; margin-bottom: 42px; }

/* 卡片网格 */
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--panel); border: 1px solid var(--line-soft); border-radius: 14px; padding: 26px 26px 24px;
  transition: border-color .25s, transform .25s; }
.card:hover { border-color: var(--line); transform: translateY(-3px); }
.card .ico { font-size: 24px; margin-bottom: 12px; }
.card b { display: block; font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card .num { font-family: var(--num); color: var(--amber); font-size: 13px; letter-spacing: .1em; margin-bottom: 10px; }

/* 对话框 */
dialog { margin: auto; border: 0; border-radius: 16px; background: #131821; color: #fff; padding: 0;
  width: 420px; max-width: 92vw; }
dialog::backdrop { background: rgba(5, 7, 10, .75); }
.dlg { padding: 28px 30px 26px; position: relative; }
.dlg h3 { font-size: 19px; margin-bottom: 6px; }
.dlg .d { color: var(--muted); font-size: 13.5px; margin-bottom: 16px; }
.dlg .x { position: absolute; top: 14px; right: 16px; background: none; border: 0; color: var(--dim);
  font-size: 26px; cursor: pointer; line-height: 1; }
.dlg input { width: 100%; background: #0a0d12; border: 1px solid var(--line); border-radius: 9px;
  color: #fff; padding: 11px 13px; font: 15px/1.5 var(--han); outline: none; margin-bottom: 12px; }
.dlg input:focus { border-color: var(--blue); }
.dlg .btn { width: 100%; }
.dlg .tabs { display: flex; gap: 20px; border-bottom: 1px solid var(--line-soft); margin-bottom: 18px; }
.dlg .tabs button { background: none; border: 0; color: var(--muted); font: 15px/1 var(--han);
  padding: 0 2px 11px; cursor: pointer; border-bottom: 2px solid transparent; }
.dlg .tabs button[aria-selected=true] { color: #fff; border-bottom-color: var(--blue); font-weight: 600; }
.dlg .msg { min-height: 22px; font-size: 13px; margin-top: 10px; }
.dlg .msg.err { color: var(--red); }
.dlg .msg.ok { color: var(--green); }
.dlg .mini { background: none; border: 0; color: var(--dim); font: 12.5px var(--han); cursor: pointer;
  margin-top: 12px; }
.dlg .mini:hover { color: var(--muted); }
.qrbox { text-align: center; margin: 14px 0 8px; }
.qrbox img { width: 190px; background: #fff; padding: 8px; border-radius: 10px; }
.oid { font-family: var(--num); background: rgba(255, 255, 255, .08); border-radius: 6px; padding: 2px 8px; }
.dl-big { display: block; text-align: center; background: var(--green); color: #fff; border-radius: 9px;
  padding: 13px; font-weight: 700; margin-top: 14px; }

footer { border-top: 1px solid var(--line-soft); padding: 34px 0 56px; color: var(--dim); font-size: 13px; }
footer a { color: var(--muted); }
.toast { position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%); background: #1d2634;
  border: 1px solid var(--line); border-radius: 9px; padding: 11px 22px; z-index: 99; font-size: 14px; }
.toast.err { border-color: var(--red); color: #ffb0a6; }