/* ============================================================
   contact.css — 联系页高级感增强
   光标视差光晕 / 网格视差 / 卡片 tilt 3D / 表单焦点光晕 / 提交动效
   ============================================================ */

/* ---------- 光标视差光晕 ---------- */
#cursor-follow {
  position: fixed;
  top: 0; left: 0;
  width: 300px; height: 300px;
  margin: -150px 0 0 -150px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 997;
  background: radial-gradient(circle, rgba(205, 215, 232, 0.10) 0%, rgba(205, 215, 232, 0.045) 40%, transparent 70%);
  opacity: 0;
  will-change: transform;
  transform: translate3d(0, 0, 0);
}
body.cursor-follow-on #cursor-follow { opacity: 1; }

/* ---------- 网格视差（跟随光标轻微位移，形成空间感） ---------- */
.bg-grid {
  will-change: transform;
  transform: translate3d(var(--grid-dx, 0px), var(--grid-dy, 0px), 0);
}

/* ---------- 联系卡 tilt 3D ---------- */
.contact-method {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.16s ease-out, border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.contact-method:hover {
  transform: perspective(720px) rotateX(var(--tilt-y, 0deg)) rotateY(var(--tilt-x, 0deg)) translateY(-3px);
  border-color: rgba(170, 190, 220, 0.5);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.28), 0 0 26px rgba(150, 175, 215, 0.1);
}
.contact-method .icon,
.contact-method div { transform: translateZ(16px); }
.contact-method .method-note { transform: translateZ(8px); }
.contact-method:hover .icon {
  border-color: rgba(170, 190, 220, 0.55);
  box-shadow: 0 0 22px rgba(150, 175, 215, 0.18);
  color: #fff;
}

/* ---------- 联系信息区视觉增强 ---------- */
.contact-layout { gap: 40px; }
.contact-tip {
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  background: linear-gradient(120deg, var(--bg-soft), var(--bg-card));
}

/* ---------- 表单焦点光晕 ---------- */
.form-group { position: relative; }
.form-group label {
  transition: color 0.3s ease;
}
.form-control {
  transition: border-color 0.28s ease, box-shadow 0.28s ease, background 0.28s ease, transform 0.28s ease;
}
.form-control:focus { transform: translateY(-1px); }
.form-group.focus label { color: var(--brand); }
.form-group.focus .form-control {
  border-color: rgba(150, 175, 215, 0.75);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(150, 175, 215, 0.1), 0 0 26px rgba(150, 175, 215, 0.12);
}

/* ---------- 提交按钮动效 ---------- */
.contact-form .btn-primary {
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.3s ease, opacity 0.3s ease;
}
.contact-form .btn-primary:active { transform: translateY(1px) scale(0.985); }
.contact-form .btn-primary:focus-visible { box-shadow: 0 0 0 4px rgba(150, 175, 215, 0.22); }
.contact-form .btn-primary.submitted {
  opacity: 0.82;
  box-shadow: 0 0 0 4px rgba(150, 175, 215, 0.14), 0 8px 30px rgba(150, 175, 215, 0.18);
}

/* ---------- 消息动效 ---------- */
.form-message { transition: opacity 0.4s ease, transform 0.4s ease; }
.form-message:not(:empty) { animation: contact-msg-in 0.45s ease both; }
@keyframes contact-msg-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .contact-method { transform: none !important; }
  .contact-method:hover { transform: translateY(-3px); }
  .contact-method .icon,
  .contact-method div { transform: none; }
  .bg-grid { transform: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  #cursor-follow { display: none; }
  .bg-grid { transform: none !important; }
  .contact-method:hover { transform: translateY(-3px); }
}