/* ═══════════════════════════════════════════════════════════════
   LAUNCH SCREEN — 网站启动加载屏（品牌欢迎幕布）
   方案A：深蓝科技幕 + logo 光圈呼吸 + 橙色进度线 + 标语
   独立文件，可整体回滚（删除本文件 + HTML 中 link / div / script 引用）。
   配套：assets/js/launch.js 收幕逻辑
   ═══════════════════════════════════════════════════════════════ */

/* 收幕前锁定页面滚动，避免加载期误触滚动 */
html.launch-lock,
html.launch-lock body { overflow: hidden; height: 100%; }

/* 本次会话已看过启动屏（<head> 早期脚本加的 .launch-skip）：
   首帧即隐藏，避免"先闪一下幕布再消失"。不加 .launch-armed 时导航照常入场。 */
html.launch-skip #launch { display: none !important; }

#launch {
  position: fixed;
  inset: 0;
  /* 需高于站内已有 #skeleton（9999）等全屏层，确保品牌幕布盖在最上 */
  z-index: 10001;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(216,120,48,.14) 0%, rgba(216,120,48,0) 55%),
    linear-gradient(160deg, #12253c 0%, #0e1c2f 55%, #0a1522 100%);
  opacity: 1;
  transition: opacity .8s ease, visibility .8s ease;
}
#launch.leave {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* logo 光圈呼吸 */
#launch .launch-logo {
  position: relative;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: launchBreath 2s ease-in-out infinite;
}
#launch .launch-logo img {
  width: 72px;
  height: 72px;
  object-fit: contain;
}
#launch .launch-logo::before,
#launch .launch-logo::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  pointer-events: none;
}
#launch .launch-logo::before {
  border: 2px solid rgba(216,120,48,.55);
  animation: launchRing 2.2s ease-out infinite;
}
#launch .launch-logo::after {
  border: 1px solid rgba(48,72,120,.5);
  animation: launchRing 2.2s ease-out .55s infinite;
}

@keyframes launchBreath {
  0%, 100% { transform: scale(1);    filter: drop-shadow(0 0 18px rgba(216,120,48,.35)); }
  50%      { transform: scale(1.05); filter: drop-shadow(0 0 34px rgba(216,120,48,.6)); }
}
@keyframes launchRing {
  0%   { transform: scale(.9);  opacity: .9; }
  70%  { transform: scale(1.55); opacity: 0; }
  100% { transform: scale(1.55); opacity: 0; }
}

/* 标语：英文为主，Welcome to 白字，HONDVO 加粗 + logo 橙蓝渐变 */
#launch .launch-tagline {
  font-size: clamp(18px, 2.6vw, 26px);
  font-weight: 500;
  letter-spacing: 2px;
  color: rgba(255,255,255,.9);
  text-align: center;
}
#launch .launch-welcome { color: rgba(255,255,255,.9); }
#launch .launch-brand {
  font-weight: 800;
  letter-spacing: 5px;
  background: linear-gradient(115deg, #D87830 0%, #F0A35E 55%, #304878 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 橙色进度线 */
#launch .launch-bar {
  width: min(220px, 60vw);
  height: 3px;
  border-radius: 3px;
  background: rgba(255,255,255,.12);
  overflow: hidden;
}
#launch .launch-bar i {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, #F0874A, #D87830 60%, #C25A1A);
  animation: launchFill 3s cubic-bezier(.4,0,.2,1) forwards;
}
@keyframes launchFill { from { width: 0; } to { width: 100%; } }

/* reduced-motion：关闭动效但保留幕布淡出 */
@media (prefers-reduced-motion: reduce) {
  #launch .launch-logo { animation: none; }
  #launch .launch-logo::before, #launch .launch-logo::after { animation: none; display: none; }
  #launch .launch-bar i { animation-duration: .001s; }
}