:root {
  --bg1: #0f1023;
  --bg2: #171238;
  --bg3: #0b1c3e;
  --card: rgba(255, 255, 255, 0.045);
  --border: rgba(255, 255, 255, 0.10);
  --text: #e7e9f5;
  --muted: #9aa3c2;
  --purple: #8b5cf6;
  --blue: #4f6df5;
  --grad: linear-gradient(135deg, #8b5cf6 0%, #4f6df5 100%);
  --danger: #f87171;
  --ok: #34d399;
  --radius: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { min-height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg1);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 16px 80px;
  position: relative;
}

/* 背景光晕 */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px 400px at 15% 10%, rgba(139, 92, 246, 0.28), transparent 65%),
    radial-gradient(700px 500px at 85% 20%, rgba(79, 109, 245, 0.25), transparent 65%),
    radial-gradient(800px 600px at 50% 110%, rgba(99, 102, 241, 0.20), transparent 70%),
    linear-gradient(160deg, var(--bg1) 0%, var(--bg2) 55%, var(--bg3) 100%);
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  padding: 32px 28px 28px;
}

.brand { text-align: center; margin-bottom: 24px; }
.logo { font-size: 40px; margin-bottom: 8px; }
.brand h1 {
  font-size: 22px;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
}
.brand .sub { color: var(--muted); font-size: 13px; margin-top: 6px; }

/* 标签页 */
.tabs {
  display: flex;
  gap: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 20px;
}
.tab {
  flex: 1;
  padding: 8px 0;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.2s;
}
.tab.active {
  background: var(--grad);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 6px; }

input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border 0.2s, box-shadow 0.2s;
}
input:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25);
}
input::placeholder { color: rgba(154, 163, 194, 0.6); }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 14px 0 18px;
  font-size: 13px;
}
.check { display: flex; align-items: center; gap: 6px; margin: 0; color: var(--muted); cursor: pointer; }
.check input { width: auto; }
.link { background: none; border: none; color: var(--blue); cursor: pointer; font-size: 13px; }
.link:hover { text-decoration: underline; }

.btn {
  display: block;
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, opacity 0.2s;
  margin-top: 6px;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn:not(:disabled):hover { transform: translateY(-1px); }
.btn.primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}
.btn.primary:not(:disabled):hover { box-shadow: 0 8px 26px rgba(99, 102, 241, 0.5); }
.btn.ghost {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.small { width: auto; padding: 10px 14px; font-size: 13px; margin: 0; white-space: nowrap; }

.err { color: var(--danger); font-size: 13px; margin-top: 10px; min-height: 18px; }
.closed {
  color: #fbbf24;
  font-size: 13px;
  margin-top: 12px;
  padding: 10px;
  border: 1px dashed rgba(251, 191, 36, 0.4);
  border-radius: 8px;
  text-align: center;
}

/* 邮箱/手机切换 */
.seg { display: flex; gap: 6px; margin-bottom: 4px; }
.seg-btn {
  flex: 1;
  padding: 7px 0;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}
.seg-btn.active { background: rgba(139, 92, 246, 0.18); border-color: var(--purple); color: #fff; }

.code-row { display: flex; gap: 8px; margin-top: 14px; }
.code-row input { flex: 1; }

/* 已登录 */
.ok-box {
  text-align: center;
  padding: 18px 12px;
  border: 1px solid rgba(52, 211, 153, 0.3);
  background: rgba(52, 211, 153, 0.08);
  border-radius: 12px;
  margin-bottom: 16px;
}
.ok-title { color: var(--ok); font-weight: 600; font-size: 15px; }
.who { color: var(--muted); font-size: 13px; margin-top: 6px; word-break: break-all; }

.sec { margin-top: 18px; border-top: 1px solid var(--border); padding-top: 14px; font-size: 13px; color: var(--muted); }
.sec h4 { color: var(--text); margin-bottom: 8px; font-size: 14px; }
.sec .status { margin-bottom: 8px; }
.sec .recovery {
  margin-top: 10px;
  padding: 10px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px dashed rgba(139, 92, 246, 0.5);
  border-radius: 8px;
  font-family: ui-monospace, monospace;
  font-size: 15px;
  letter-spacing: 2px;
  text-align: center;
  color: #c4b5fd;
}
.sec .secret { font-family: ui-monospace, monospace; font-size: 12px; word-break: break-all; background: rgba(0,0,0,0.3); padding: 8px; border-radius: 8px; margin: 8px 0; }
.sec img.qr { display: block; margin: 10px auto; width: 168px; height: 168px; border-radius: 10px; background: #fff; padding: 8px; }
.sec input { margin: 6px 0 10px; }

footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 10px;
  font-size: 12px;
  color: rgba(154, 163, 194, 0.7);
  background: rgba(10, 10, 24, 0.6);
  backdrop-filter: blur(8px);
  z-index: 10;
}
footer a { color: inherit; text-decoration: none; }
footer a:hover { color: var(--text); }

@media (max-width: 480px) {
  body { padding: 24px 12px 72px; }
  .card { padding: 24px 18px 20px; }
}