/* ============================================================
   嘉萱漢方 - 共用高質感交互動畫 (Native CSS + JS)
   ============================================================ */

/* ---------- 動畫變數 ---------- */
:root {
  --anim-fast: 0.2s;
  --anim-base: 0.35s;
  --anim-slow: 0.6s;
  --anim-stagger: 0.08s;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 無障礙/手機降級 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .cursor-glow,
  .particle-layer,
  .hud-float,
  .hero-bg-kenburns {
    display: none !important;
  }
}

@media (max-width: 768px) {
  .cursor-glow {
    display: none !important;
  }

  .particle-layer {
    opacity: 0.35 !important;
  }
}

/* ---------- 頁面切場 Overlay ---------- */
#pageTransition {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle at 50% 50%, rgba(35, 213, 233, 0.18), rgba(9, 13, 16, 0.92));
  transform: scale(1.15);
  transition: opacity 0.45s var(--ease-smooth), transform 0.55s var(--ease-out-expo);
}

#pageTransition.active {
  opacity: 1;
  transform: scale(1);
}

/* ---------- 滾動進度條 ---------- */
#scrollProgress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  z-index: 100;
  background: linear-gradient(90deg, #23d5e9, #60f0be, #f3b84a);
  box-shadow: 0 0 12px rgba(35, 213, 233, 0.7);
  transition: width 0.1s linear;
}

/* ---------- 滑鼠光暈（桌面限定） ---------- */
.cursor-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle, rgba(35, 213, 233, 0.12) 0%, rgba(96, 240, 190, 0.05) 40%, transparent 70%);
  transform: translate(-50%, -50%);
  transition: transform 0.15s linear, opacity 0.3s ease;
  opacity: 0;
  mix-blend-mode: screen;
}

body:hover .cursor-glow {
  opacity: 1;
}

/* ---------- 入場動畫基礎 ---------- */
[data-anim] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out-expo), transform 0.6s var(--ease-out-expo);
  will-change: opacity, transform;
}

[data-anim].in-view {
  opacity: 1;
  transform: translateY(0);
}

[data-anim="fade"] {
  transform: translateY(0);
}

[data-anim="fade-up"] {
  transform: translateY(28px);
}

[data-anim="fade-down"] {
  transform: translateY(-28px);
}

[data-anim="slide-left"] {
  transform: translateX(40px);
}

[data-anim="slide-right"] {
  transform: translateX(-40px);
}

[data-anim="scale"] {
  transform: scale(0.92);
}

[data-anim="reveal"] {
  clip-path: inset(0 0 100% 0);
  transform: none;
}

[data-anim="reveal"].in-view {
  clip-path: inset(0 0 0 0);
}

[data-anim="timeline-line"] {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

/* ---------- Stagger 延遲 ---------- */
[data-anim-delay="1"] { transition-delay: calc(var(--anim-stagger) * 1); }
[data-anim-delay="2"] { transition-delay: calc(var(--anim-stagger) * 2); }
[data-anim-delay="3"] { transition-delay: calc(var(--anim-stagger) * 3); }
[data-anim-delay="4"] { transition-delay: calc(var(--anim-stagger) * 4); }
[data-anim-delay="5"] { transition-delay: calc(var(--anim-stagger) * 5); }
[data-anim-delay="6"] { transition-delay: calc(var(--anim-stagger) * 6); }
[data-anim-delay="7"] { transition-delay: calc(var(--anim-stagger) * 7); }
[data-anim-delay="8"] { transition-delay: calc(var(--anim-stagger) * 8); }

/* 容器 stagger：子元素依序進入 */
[data-stagger] > [data-anim] {
  transition-delay: 0s;
}

[data-stagger].in-view > [data-anim]:nth-child(1) { transition-delay: calc(var(--anim-stagger) * 1); }
[data-stagger].in-view > [data-anim]:nth-child(2) { transition-delay: calc(var(--anim-stagger) * 2); }
[data-stagger].in-view > [data-anim]:nth-child(3) { transition-delay: calc(var(--anim-stagger) * 3); }
[data-stagger].in-view > [data-anim]:nth-child(4) { transition-delay: calc(var(--anim-stagger) * 4); }
[data-stagger].in-view > [data-anim]:nth-child(5) { transition-delay: calc(var(--anim-stagger) * 5); }
[data-stagger].in-view > [data-anim]:nth-child(6) { transition-delay: calc(var(--anim-stagger) * 6); }
[data-stagger].in-view > [data-anim]:nth-child(7) { transition-delay: calc(var(--anim-stagger) * 7); }
[data-stagger].in-view > [data-anim]:nth-child(8) { transition-delay: calc(var(--anim-stagger) * 8); }

/* ---------- 按鈕光掃 Hover ---------- */
.btn-glow {
  position: relative;
  overflow: hidden;
  transition: transform 0.25s var(--ease-smooth), box-shadow 0.25s ease;
}

.btn-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.22) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.55s var(--ease-out-expo);
  pointer-events: none;
}

.btn-glow:hover::after,
.btn-glow:focus-visible::after {
  transform: translateX(120%);
}

.btn-glow:hover,
.btn-glow:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(35, 213, 233, 0.25);
}

/* ---------- 導航連結 Hover 底線 ---------- */
.link-underline {
  position: relative;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 1.5px;
  background: linear-gradient(90deg, #23d5e9, #60f0be);
  box-shadow: 0 0 8px rgba(35, 213, 233, 0.6);
  transition: width 0.3s var(--ease-out-expo), left 0.3s var(--ease-out-expo);
}

.link-underline:hover::after,
.link-underline:focus-visible::after {
  left: 0;
  width: 100%;
}

/* ---------- 手機漢堡按鈕動畫 ---------- */
.hamburger {
  position: relative;
  transition: transform 0.3s var(--ease-smooth);
}

.hamburger > span {
  position: relative;
  display: block;
  transition: transform 0.3s var(--ease-smooth), box-shadow 0.3s ease;
}

.hamburger[aria-expanded="true"] > span {
  transform: rotate(0deg);
  box-shadow: none;
}

.hamburger[aria-expanded="true"] > span::before,
.hamburger[aria-expanded="true"] > span::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 20px;
  height: 2px;
  background: currentColor;
}

.hamburger[aria-expanded="true"] > span::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.hamburger[aria-expanded="true"] > span::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* ---------- 卡片 3D Hover ---------- */
.card-tilt {
  transition: transform 0.35s var(--ease-smooth), box-shadow 0.35s ease;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.card-tilt:hover,
.card-tilt:focus-within {
  transform: translateY(-6px) rotateX(2deg) rotateY(-2deg);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4), 0 0 30px rgba(35, 213, 233, 0.12);
}

/* ---------- 掃描線 Hover ---------- */
.scanline-hover {
  position: relative;
  overflow: hidden;
}

.scanline-hover::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(35, 213, 233, 0.12), transparent);
  transform: translateY(-100%);
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
  z-index: 1;
}

.scanline-hover:hover::before,
.scanline-hover:focus-within::before {
  opacity: 1;
  animation: scanDown 0.85s var(--ease-out-expo) forwards;
}

@keyframes scanDown {
  to { transform: translateY(100%); }
}

/* ---------- 脈衝光暈 ---------- */
.pulse-glow {
  animation: pulseGlow 2.2s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 18px rgba(35, 213, 233, 0.2); }
  50% { box-shadow: 0 0 32px rgba(35, 213, 233, 0.45); }
}

/* ---------- 背景緩慢漂移 ---------- */
.hud-float {
  animation: hudFloat 18s ease-in-out infinite;
}

@keyframes hudFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Hero Ken Burns ---------- */
.hero-bg-kenburns {
  animation: kenBurns 22s ease-in-out infinite alternate;
}

@keyframes kenBurns {
  0% { transform: scale(1) translate(0, 0); }
  100% { transform: scale(1.08) translate(-1%, -1%); }
}

/* ---------- 數字跳動 ---------- */
.count-up {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

/* ---------- 連接線填充動畫 ---------- */
.timeline-line {
  position: absolute;
  width: 2px;
  background: rgba(35, 213, 233, 0.15);
  overflow: hidden;
}

.timeline-line::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, #23d5e9, #60f0be);
  transform: translateY(-100%);
  transition: transform 1.2s var(--ease-out-expo);
}

.timeline-line.in-view::after {
  transform: translateY(0);
}

/* ---------- FAQ 平滑高度 ---------- */
.faq-smooth {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease-out-expo);
}

.faq-item.open .faq-smooth {
  grid-template-rows: 1fr;
}

.faq-smooth > div {
  overflow: hidden;
}

/* ---------- 粒子背景層 ---------- */
.particle-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* ---------- 霓虹邊框流動 ---------- */
.border-flow {
  position: relative;
}

.border-flow::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(90deg, #23d5e9, #60f0be, #f3b84a, #23d5e9);
  background-size: 300% 100%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: borderFlow 4s linear infinite;
  pointer-events: none;
}

@keyframes borderFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 300% 50%; }
}