/* ============================================================
   頁面過渡動畫與增強樣式
   聖文 ♡ 壯壯 — 一週年紀念網頁
   ============================================================ */

/* === 頁面進場動畫 === */
@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-enter {
  animation: pageEnter 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* === 頁面切換覆蓋層 === */
.page-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 99999;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.page-transition-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.page-transition-overlay::before,
.page-transition-overlay::after {
  content: '';
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  background: var(--bg-primary);
  transition: transform 0.5s cubic-bezier(0.76, 0, 0.24, 1);
}

.page-transition-overlay::before {
  left: 0;
  transform: translateX(-100%);
}

.page-transition-overlay::after {
  right: 0;
  transform: translateX(100%);
}

.page-transition-overlay.active::before {
  transform: translateX(0);
}

.page-transition-overlay.active::after {
  transform: translateX(0);
}

/* === 頁面載入指示器 === */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 99998;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-heart {
  font-size: 4rem;
  animation: heartbeat 1.5s ease-in-out infinite;
  filter: drop-shadow(0 0 20px rgba(255, 107, 157, 0.5));
}

.loader-text {
  font-family: var(--font-handwriting);
  font-size: 1.2rem;
  color: var(--gold);
  margin-top: 1.5rem;
  opacity: 0.8;
  animation: fadeInOut 2s ease-in-out infinite;
}

@keyframes fadeInOut {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* === 滾動進度指示器 === */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--rose), var(--gold), var(--rose-light));
  z-index: 10001;
  transition: width 0.1s linear;
  box-shadow: 0 0 10px rgba(255, 107, 157, 0.5);
}

/* === 增強的浮動愛心動畫 === */
@keyframes floatHeartEnhanced {
  0% {
    transform: translateY(100vh) rotate(0deg) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 0.7;
    transform: translateY(90vh) rotate(15deg) scale(1);
  }
  90% {
    opacity: 0.4;
  }
  95% {
    opacity: 0.2;
    transform: translateY(5vh) rotate(345deg) scale(0.6);
  }
  100% {
    transform: translateY(-10vh) rotate(360deg) scale(0.4);
    opacity: 0;
  }
}

.floating-heart-enhanced {
  position: absolute;
  bottom: -30px;
  font-size: 1.4rem;
  animation: floatHeartEnhanced linear infinite;
  opacity: 0;
  filter: drop-shadow(0 0 5px rgba(255, 107, 157, 0.3));
  will-change: transform, opacity;
}

/* === 增強的 reveal 動畫 === */
.reveal-enhanced {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform, opacity;
}

.reveal-enhanced.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 交錯 reveal */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(25px);
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.12s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.19s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.26s; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.33s; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.40s; }
.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* === 圖片懶加載樣式 === */
.lazy-image {
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.lazy-image.loaded {
  opacity: 1;
  transform: scale(1);
}

.lazy-image-placeholder {
  background: linear-gradient(
    110deg,
    var(--bg-tertiary) 8%,
    var(--glass-bg) 18%,
    var(--bg-tertiary) 33%
  );
  background-size: 200% 100%;
  animation: shimmerLoading 1.5s linear infinite;
}

@keyframes shimmerLoading {
  to {
    background-position-x: -200%;
  }
}

/* === 按鈕點擊波紋效果增強 === */
.ripple-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  border-radius: inherit;
}

.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* === 滑鼠跟隨愛心效果 === */
.cursor-heart {
  position: fixed;
  pointer-events: none;
  font-size: 1.2rem;
  z-index: 9999;
  animation: cursorHeartFade 1s ease forwards;
  filter: drop-shadow(0 0 5px rgba(255, 107, 157, 0.5));
  will-change: transform, opacity;
}

@keyframes cursorHeartFade {
  0% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  100% {
    opacity: 0;
    transform: scale(0.5) translateY(-30px);
  }
}

/* === 增強的卡片懸停效果 === */
.card-3d-hover {
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
              box-shadow 0.4s ease;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.card-3d-hover:hover {
  transform: translateY(-8px) rotateX(2deg) rotateY(-2deg);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 30px rgba(175, 138, 84, 0.15);
}

/* === 打字機動畫 ===
   使用時需在元素上設定 style="--tw-chars: N" 來匹配文字字數 */
.typewriter {
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--gold);
  width: 0;
  animation: typing 3s steps(var(--tw-chars, 20), end) forwards,
             blink-caret 0.75s step-end infinite;
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink-caret {
  from, to { border-color: transparent; }
  50% { border-color: var(--gold); }
}

/* === 彩虹漸變文字 === */
.rainbow-text {
  background: linear-gradient(
    90deg,
    var(--rose),
    var(--gold),
    var(--rose-light),
    var(--gold),
    var(--rose)
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: rainbow 4s linear infinite;
}

@keyframes rainbow {
  to {
    background-position: 200% center;
  }
}

/* === 聚光燈效果 === */
.spotlight {
  position: relative;
  overflow: hidden;
}

.spotlight::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle at var(--x, 50%) var(--y, 50%),
    rgba(255, 255, 255, 0.1) 0%,
    transparent 20%
  );
  pointer-events: none;
  transition: opacity 0.3s ease;
}

/* === 觸控回饋增強 === */
@media (hover: none) and (pointer: coarse) {
  .btn-ripple:active {
    transform: scale(0.96);
  }
  
  .card-3d-hover:active {
    transform: translateY(-4px) scale(0.98);
  }
  
  /* 增大觸控目標 */
  .tab-item {
    min-height: 56px;
    padding: 8px 12px;
  }
}

/* === 流暢的圖片載入過渡 === */
img {
  transition: opacity 0.4s ease, filter 0.4s ease;
}

img[loading="lazy"] {
  opacity: 0;
}

img.loaded,
img[loading="lazy"].loaded {
  opacity: 1;
}

/* === 微妙的載入動畫 === */
.loading-dots::after {
  content: '';
  animation: loadingDots 1.5s steps(4, end) infinite;
}

@keyframes loadingDots {
  0% { content: ''; }
  25% { content: '.'; }
  50% { content: '..'; }
  75% { content: '...'; }
  100% { content: ''; }
}

/* === 結束標記動畫 === */
@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in-scale {
  animation: fadeInScale 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}