:root {
  --bg: #0d1117; --card: #161b22; --line: #232a35;
  --fg: #e6edf3; --dim: #8b949e; --acc: #2f81f7; --ok: #3fb950; --warn: #d29922;
}
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
body {
  background: var(--bg); color: var(--fg);
  font: 16px/1.5 -apple-system, "PingFang SC", sans-serif;
  padding: max(12px, env(safe-area-inset-top)) 14px max(24px, env(safe-area-inset-bottom));
  max-width: 560px; margin: 0 auto;
}
header h1 { font-size: 24px; font-weight: 700; }
header h1 span { font-size: 13px; color: var(--dim); margin-left: 8px; font-weight: 400; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0 16px; }
.chip {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--dim);
}
.chip.on { color: #0d1117; background: var(--ok); border-color: var(--ok); }
.chip.off { opacity: .55; }
.chip.lat { color: var(--acc); border-color: var(--acc); }

.main-btn {
  width: 100%; padding: 18px; font-size: 20px; font-weight: 700;
  border: none; border-radius: 14px; background: var(--acc); color: #fff;
}
.main-btn.stop { background: #da3633; }
.main-btn:active { opacity: .85; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 14px; margin-top: 14px;
}
.card h2 { font-size: 15px; color: var(--dim); margin-bottom: 10px; font-weight: 600; }
.hint { font-size: 13px; color: var(--dim); }
code { background: var(--line); padding: 1px 5px; border-radius: 4px; font-size: 12px; }

.subs { display: flex; flex-direction: column; gap: 10px; min-height: 60px; max-height: 40vh; overflow-y: auto; }
.sub { border-left: 3px solid var(--acc); padding-left: 10px; }
.sub .src { font-size: 13px; color: var(--dim); }
.sub .tgt { font-size: 16px; }
.sub.hint { border: none; }

.row { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
input[type=range] { width: 100%; }

.sub-btn {
  width: 100%; padding: 12px; margin-top: 10px; font-size: 16px;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--line); color: var(--fg);
}
.sub-btn.rec { background: #da3633; border-color: #da3633; color: #fff; }

.bar { height: 6px; background: var(--line); border-radius: 3px; margin-top: 10px; overflow: hidden; }
.bar div { height: 100%; width: 0; background: var(--acc); transition: width .3s; }
.hidden { display: none; }

.help { padding-left: 18px; font-size: 13px; color: var(--dim); display: grid; gap: 8px; }
.help b { color: var(--fg); }
footer { text-align: center; font-size: 11px; color: var(--dim); margin-top: 24px; }

/* ============ 头部 ============ */
.head-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.user-btn {
  font-size: 13px; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--card); color: var(--fg);
  white-space: nowrap;
}
.user-btn.on { background: var(--ok); color: #0d1117; border-color: var(--ok); }
.user-btn:active { opacity: .8; }

/* ============ 模态框 ============ */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,.7); z-index: 999;
  display: flex; align-items: center; justify-content: center;
  padding: 14px; overflow-y: auto;
}
.modal.hidden { display: none; }
.modal-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 22px 18px; max-width: 420px; width: 100%;
  position: relative; max-height: 90vh; overflow-y: auto;
}
.modal-card h2 { font-size: 18px; margin-bottom: 8px; }
.modal-close {
  position: absolute; top: 8px; right: 12px; background: none; border: none;
  color: var(--dim); font-size: 26px; line-height: 1; cursor: pointer;
}
.modal-close:active { color: var(--fg); }

.row input[type=tel], .row input[type=text], .row input[type=password] {
  width: 100%; padding: 11px 12px; font-size: 16px;
  background: var(--bg); color: var(--fg);
  border: 1px solid var(--line); border-radius: 8px; outline: none;
}
.row input:focus { border-color: var(--acc); }
.row span { font-size: 13px; color: var(--dim); }

/* ============ 套餐卡 ============ */
.plan-list { display: grid; gap: 10px; margin-top: 10px; }
.plan-card {
  border: 1px solid var(--line); border-radius: 12px;
  padding: 14px; cursor: pointer; transition: all .15s;
}
.plan-card:active { transform: scale(.98); }
.plan-card.recommend { border-color: var(--acc); background: rgba(47,129,247,.08); }
.plan-card .name { font-size: 16px; font-weight: 600; }
.plan-card .price { font-size: 22px; font-weight: 700; color: var(--acc); margin: 6px 0; }
.plan-card .price small { font-size: 12px; color: var(--dim); font-weight: 400; }
.plan-card .desc { font-size: 12px; color: var(--dim); }
.plan-card .tag { display: inline-block; font-size: 11px; padding: 1px 6px; border-radius: 4px;
  background: var(--acc); color: #fff; margin-left: 6px; vertical-align: middle; }
.plan-card .tag.free { background: var(--ok); color: #0d1117; }
.plan-card.disabled { opacity: .45; cursor: not-allowed; }

/* ============ 支付二维码 ============ */
.pay-qr { display: flex; justify-content: center; padding: 20px 0; min-height: 200px; }
.pay-qr img, .pay-qr canvas { width: 220px; height: 220px; background: #fff; border-radius: 8px; }
.pay-qr .placeholder { color: var(--dim); font-size: 13px; text-align: center; padding: 40px 0; }

#auth-to-register { color: var(--acc); text-decoration: none; }
#auth-to-register:active { opacity: .7; }