/* style.css — iCloud 风格（玻璃模糊，白底） */
:root{
  --bg:#f7f8fa;
  --card:#ffffff;
  --muted:#8b8f95;
  --accent:#0070f3;
  --danger:#e03b3b;
  --radius:16px;
  --glass-blur:10px;
  --shadow: 0 8px 30px rgba(20,24,28,0.08);
  --glass-border: rgba(255,255,255,0.65);
  --glass-plate: rgba(255,255,255,0.7);
  font-size: 16px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background: linear-gradient(180deg, var(--bg) 0%, #ffffff 100%);
  font-family: -apple-system, "SF Pro Text", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
  color:#111;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:100vh;
}

/* overall wrapper */
.page-wrap{
  width:100%;
  max-width:980px;
  padding:28px;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-direction:column;
}

/* glass card */
.card{
  width:100%;
  max-width:420px;
  background: var(--glass-plate);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  border: 1px solid rgba(20,24,28,0.04);
  backdrop-filter: blur(var(--glass-blur));
  padding: 22px;
  transition: transform .25s cubic-bezier(.2,.9,.3,1), box-shadow .25s;
}

.card:hover{ transform: translateY(-4px); box-shadow: 0 18px 40px rgba(20,24,28,0.12); }

.shell{ text-align:center; padding:34px; }

.brand{
  margin:0;
  font-size:28px;
  letter-spacing: -0.02em;
  font-weight:600;
}
.subtitle{ margin:6px 0 16px; color:var(--muted); font-size:13px; }

/* auth card specifics */
.auth-card{ padding:18px 18px 24px; position:relative; }
.back{
  position:absolute; left:18px; top:12px; background:none; border:none; color:var(--muted); font-size:18px; cursor:pointer;
}
.card-header{ text-align:left; margin-bottom:12px; }
.card-header h2{ margin:0; font-size:20px; }
.card-footer{ margin-top:14px; text-align:center; color:var(--muted); font-size:12px; }

/* form */
.form{ display:flex; flex-direction:column; gap:12px; margin-top:8px; }
.field{ display:flex; flex-direction:column; gap:6px; }
.field .label-text{ color:var(--muted); font-size:13px; }
.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="password"]{
  padding:12px 14px;
  border-radius:12px;
  border: 1px solid rgba(16,20,24,0.06);
  background: rgba(255,255,255,0.9);
  outline:none;
  font-size:15px;
  transition: box-shadow .12s, border-color .12s;
}
.field input:focus{ box-shadow: 0 6px 20px rgba(17,24,39,0.06); border-color: rgba(0,112,243,0.14); }

.field-error{ color:var(--danger); font-size:12px; min-height:16px; }

/* code field with send button */
.code-field{ display:flex; gap:10px; align-items:center; }
.code-field input{ flex:1; }
.code-field .btn.small{ padding:8px 10px; font-size:13px; }

/* buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border-radius:12px;
  padding:10px 14px;
  font-weight:600;
  border: none;
  cursor:pointer;
  background:transparent;
  transition: transform .12s ease, box-shadow .12s;
}
.btn:hover{ transform: translateY(-2px); }
.btn:active{ transform: translateY(0); }

.btn-primary{
  background: linear-gradient(180deg, var(--accent), #0058d6);
  color:#fff;
  box-shadow: 0 10px 24px rgba(0,112,243,0.14);
}
.btn.ghost{ border:1px solid rgba(17,24,39,0.06); background:transparent; color:#111; }
.btn.small{ padding:8px 10px; border-radius:10px; font-size:13px; }
.btn.full{ width:100%; }

.actions{ display:flex; gap:12px; margin-top:20px; justify-content:center; }
.actions .btn{ min-width:140px; }

/* misc */
.or{ display:flex; align-items:center; gap:12px; color:var(--muted); margin:8px 0; }
.or span{ background:transparent; padding:4px 8px; }

/* toggle group */
.toggle-group{ display:flex; border-radius:12px; overflow:hidden; border:1px solid rgba(17,24,39,0.06); }
.toggle{ flex:1; padding:10px 12px; background:transparent; border:0; cursor:pointer; font-weight:600; }
.toggle.active{ background:rgba(0,112,243,0.06); color:var(--accent); }

/* small helpers */
.form-row{ display:flex; align-items:center; gap:12px; }
.form-row.between{ justify-content:space-between; }
.checkbox{ display:flex; gap:6px; align-items:center; color:var(--muted); font-size:14px; }
.link{ color:var(--accent); text-decoration:none; }
.small{ font-size:13px; }
.center{ text-align:center; }
.muted{ color:var(--muted); }

/* messages */
.msg{ min-height:20px; font-size:13px; margin-top:6px; }
.msg.success{ color: #0a8a3b; }
.msg.error{ color: var(--danger); }

/* responsive */
@media (max-width:480px){
  .card{ margin: 18px 12px; border-radius:14px; padding:16px; }
  .brand{ font-size:22px; }
}