/* ========================================
   馥靈之鑰 Hour Light - 浩瀚宇宙星空效果
   hl-cosmos.css v5.0 ｜星空飄移版
   星星緩緩飄移 + 流星劃過 + 光暈呼吸
   頁面主體零抖動（純 transform + opacity）
   ======================================== */

.hl-cosmos {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: -1;
  -webkit-transform: translateZ(0); /* iOS：強制 GPU 合成層，避免 position:fixed 閃爍 */
  transform: translateZ(0);
  background:
    /* 斜對角星雲光帶 */
    linear-gradient(135deg,
      transparent 20%, rgba(92,58,128,0.07) 30%, rgba(139,105,180,0.10) 38%,
      rgba(180,150,210,0.06) 42%, rgba(233,194,125,0.05) 48%,
      rgba(180,150,210,0.07) 52%, rgba(139,105,180,0.09) 58%,
      rgba(92,58,128,0.06) 65%, transparent 75%),
    /* 四角光暈 */
    radial-gradient(ellipse 70% 55% at 20% 15%, rgba(80,45,140,0.22) 0%, transparent 60%),
    radial-gradient(ellipse 60% 45% at 80% 88%, rgba(120,75,35,0.14) 0%, transparent 55%),
    radial-gradient(ellipse 55% 40% at 65% 25%, rgba(55,25,100,0.14) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 10% 75%, rgba(35,15,70,0.12) 0%, transparent 45%),
    radial-gradient(ellipse 40% 30% at 85% 18%, rgba(233,194,125,0.08) 0%, transparent 40%),
    radial-gradient(ellipse 35% 28% at 30% 92%, rgba(233,194,125,0.06) 0%, transparent 35%),
    /* 純深宇宙底色（無圖片依賴） */
    #05030a;
  background-size: auto;
  background-repeat: no-repeat;
  overflow: hidden;
  pointer-events: none;
}

/* ====== 星星飄移（純 transform，不影響佈局） ====== */
.hl-stars-layer {
  position: absolute;
  width: 200%; height: 200%;
  top: -50%; left: -50%;
  will-change: transform;
}

.hl-stars-1 {
  background-image: 
    radial-gradient(1px 1px at 50px 80px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 150px 150px, rgba(200,180,160,0.6), transparent),
    radial-gradient(1px 1px at 280px 60px, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 380px 200px, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 100px 250px, rgba(200,180,160,0.5), transparent),
    radial-gradient(1px 1px at 220px 120px, rgba(255,255,255,0.65), transparent),
    radial-gradient(1px 1px at 30px 190px, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 340px 30px, rgba(200,180,160,0.5), transparent),
    radial-gradient(1px 1px at 420px 260px, rgba(255,255,255,0.45), transparent),
    radial-gradient(1px 1px at 180px 300px, rgba(255,255,255,0.55), transparent);
  background-size: 450px 350px;
  opacity: 0.7;
  animation: starsDrift1 120s linear infinite, twinkle1 4s ease-in-out infinite;
}

.hl-stars-2 {
  background-image: 
    radial-gradient(1.5px 1.5px at 80px 180px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 200px 80px, rgba(200,170,130,0.65), transparent),
    radial-gradient(1.5px 1.5px at 320px 250px, rgba(255,255,255,0.55), transparent),
    radial-gradient(1.5px 1.5px at 420px 120px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 60px 40px, rgba(180,160,220,0.5), transparent),
    radial-gradient(1.5px 1.5px at 260px 180px, rgba(200,170,130,0.55), transparent),
    radial-gradient(1.5px 1.5px at 140px 280px, rgba(255,255,255,0.45), transparent),
    radial-gradient(1.5px 1.5px at 500px 60px, rgba(180,160,220,0.4), transparent);
  background-size: 550px 400px;
  opacity: 0.65;
  animation: starsDrift2 150s linear infinite, twinkle2 5s ease-in-out infinite;
}

.hl-stars-3 {
  background-image: 
    radial-gradient(2.5px 2.5px at 120px 200px, rgba(233,194,125,0.9), transparent),
    radial-gradient(3px 3px at 300px 100px, rgba(255,255,255,0.95), transparent),
    radial-gradient(2px 2px at 180px 320px, rgba(251,230,194,0.7), transparent),
    radial-gradient(2.5px 2.5px at 450px 180px, rgba(255,255,255,0.8), transparent),
    radial-gradient(2px 2px at 50px 120px, rgba(180,150,220,0.7), transparent);
  background-size: 600px 450px;
  opacity: 0.6;
  animation: starsDrift3 180s linear infinite, starsFlicker 8s ease-in-out infinite;
}

/* 三層星星各自飄不同方向、不同速度 */
@keyframes starsDrift1 {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-15px, 10px); }
  50%  { transform: translate(-8px, 20px); }
  75%  { transform: translate(10px, 8px); }
  100% { transform: translate(0, 0); }
}

@keyframes starsDrift2 {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(12px, -8px); }
  50%  { transform: translate(20px, 5px); }
  75%  { transform: translate(-5px, 15px); }
  100% { transform: translate(0, 0); }
}

@keyframes starsDrift3 {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-10px, -12px); }
  50%  { transform: translate(8px, -18px); }
  75%  { transform: translate(15px, -5px); }
  100% { transform: translate(0, 0); }
}

/* 大星星微微閃爍 */
@keyframes starsFlicker {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 0.75; }
}

/* 三層星星各自閃爍，錯開節奏 */
@keyframes twinkle1 {
  0%, 100% { opacity: 0.7; }
  30% { opacity: 0.45; }
  60% { opacity: 0.8; }
}

@keyframes twinkle2 {
  0%, 100% { opacity: 0.65; }
  40% { opacity: 0.4; }
  70% { opacity: 0.75; }
}

/* ====== 流星 ====== */
.hl-meteors {
  position: absolute;
  width: 100%; height: 100%;
  top: 0; left: 0;
  pointer-events: none;
  overflow: hidden;
}

.hl-meteor {
  position: absolute;
  width: 80px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), rgba(233,194,125,0.8));
  border-radius: 50%;
  opacity: 0;
  transform: rotate(35deg);
  animation: meteorFall var(--m-dur, 3s) var(--m-delay, 0s) linear infinite;
  will-change: transform, opacity;
}

.hl-meteor:nth-child(1)  { top: 5%;  left: 65%; --m-dur: 2.8s; --m-delay: 1s;  width: 70px; }
.hl-meteor:nth-child(2)  { top: 25%; left: 40%; --m-dur: 3.2s; --m-delay: 5s;  width: 90px; }
.hl-meteor:nth-child(3)  { top: 45%; left: 75%; --m-dur: 2.5s; --m-delay: 9s;  width: 60px; }
.hl-meteor:nth-child(4)  { top: 60%; left: 25%; --m-dur: 3.5s; --m-delay: 14s; width: 85px; }
.hl-meteor:nth-child(5)  { top: 35%; left: 55%; --m-dur: 2.9s; --m-delay: 19s; width: 75px; }
.hl-meteor:nth-child(6)  { top: 75%; left: 60%; --m-dur: 3.1s; --m-delay: 24s; width: 65px; }
.hl-meteor:nth-child(7)  { top: 12%; left: 20%; --m-dur: 2.6s; --m-delay: 3s;  width: 80px; }
.hl-meteor:nth-child(8)  { top: 50%; left: 85%; --m-dur: 3.3s; --m-delay: 8s;  width: 55px; }
.hl-meteor:nth-child(9)  { top: 70%; left: 35%; --m-dur: 2.7s; --m-delay: 12s; width: 72px; }
.hl-meteor:nth-child(10) { top: 18%; left: 50%; --m-dur: 3.0s; --m-delay: 16s; width: 88px; }
.hl-meteor:nth-child(11) { top: 85%; left: 45%; --m-dur: 2.4s; --m-delay: 21s; width: 62px; }
.hl-meteor:nth-child(12) { top: 40%; left: 15%; --m-dur: 3.4s; --m-delay: 27s; width: 78px; }

@keyframes meteorFall {
  0%   { transform: rotate(35deg) translateX(0);    opacity: 0; }
  5%   { opacity: 1; }
  30%  { opacity: 0.7; }
  60%  { opacity: 0; }
  100% { transform: rotate(35deg) translateX(300px); opacity: 0; }
}

/* ====== 光暈呼吸 ====== */
.hl-aura {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  mix-blend-mode: screen;
  will-change: transform, opacity;
}

.hl-aura-1 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(233,194,125,0.12) 0%, transparent 70%);
  top: 3%; right: 8%;
  opacity: 0.4;
  animation: auraBreath1 12s ease-in-out infinite;
}

.hl-aura-2 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(140,100,200,0.08) 0%, transparent 70%);
  bottom: 12%; left: 3%;
  opacity: 0.35;
  animation: auraBreath2 15s ease-in-out infinite;
}

.hl-aura-3 {
  width: 250px; height: 250px;
  background: radial-gradient(circle, rgba(233,194,125,0.06) 0%, transparent 70%);
  top: 45%; left: 35%;
  opacity: 0.3;
  animation: auraBreath3 18s ease-in-out infinite;
}

/* 光暈呼吸：只用 transform + opacity，零佈局影響 */
@keyframes auraBreath1 {
  0%, 100% { transform: scale(1);    opacity: 0.35; }
  50%      { transform: scale(1.08); opacity: 0.5; }
}

@keyframes auraBreath2 {
  0%, 100% { transform: scale(1);    opacity: 0.3; }
  50%      { transform: scale(1.06); opacity: 0.42; }
}

@keyframes auraBreath3 {
  0%, 100% { transform: scale(1) translate(0, 0);      opacity: 0.25; }
  50%      { transform: scale(1.05) translate(8px, 5px); opacity: 0.38; }
}

/* ====== RWD ====== */
@media (max-width: 768px) {
  .hl-aura-1 { width: 200px; height: 200px; }
  .hl-aura-2 { width: 160px; height: 160px; }
  .hl-aura-3 { width: 120px; height: 120px; }
  .hl-meteor { width: 50px; }
}

/* 尊重使用者動態偏好 */
@media (prefers-reduced-motion: reduce) {
  .hl-stars-1, .hl-stars-2, .hl-stars-3,
  .hl-aura-1, .hl-aura-2, .hl-aura-3 { animation: none !important; }
  .hl-meteor { display: none !important; }
}