:root {
  --nav-primary: #9933ff;
  --nav-secondary: #00ccff;
  --nav-text: #e0d0ff;
  --nav-text-dim: rgba(224, 208, 255, 0.75);
}

/* ========== 全球導覽列：科技感 + 藝術氣質 ========== */
.index-nav.global-nav {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  height: 80px;
  background: linear-gradient(
    180deg,
    rgba(8, 2, 18, 0.95) 0%,
    rgba(12, 4, 24, 0.88) 100%
  );
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-bottom: 1px solid rgba(153, 51, 255, 0.22);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.45),
    0 0 48px rgba(153, 51, 255, 0.1);
}

.index-nav.global-nav::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0, 204, 255, 0.6) 25%,
    rgba(153, 51, 255, 0.8) 50%,
    rgba(0, 204, 255, 0.6) 75%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: navBorderFlow 4s linear infinite;
}

@keyframes navBorderFlow {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Logo */
.index-nav.global-nav .nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.index-nav.global-nav .nav-logo a {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-shadow: 0 0 14px rgba(153, 51, 255, 0.45);
  transition: text-shadow 0.35s ease, transform 0.35s ease;
}

.index-nav.global-nav .nav-logo a:hover {
  text-shadow: 0 0 20px rgba(0, 204, 255, 0.65), 0 0 40px rgba(153, 51, 255, 0.35);
  transform: scale(1.02);
}

.index-nav.global-nav .nav-logo img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 12px;
  filter: drop-shadow(0 0 10px rgba(153, 51, 255, 0.55));
  transition: filter 0.35s ease, transform 0.35s ease;
}

.index-nav.global-nav .nav-logo a:hover img {
  filter: drop-shadow(0 0 14px rgba(0, 204, 255, 0.7));
  transform: rotate(-3deg) scale(1.05);
}

.index-nav.global-nav .nav-logo em {
  font-style: normal;
  color: rgba(0, 204, 255, 0.9);
  font-size: 12px;
  letter-spacing: 1.5px;
  margin-left: 8px;
  text-shadow: 0 0 10px rgba(0, 204, 255, 0.3);
}

/* Menu links */
.index-nav.global-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 58px;
}

.index-nav.global-nav .nav-links a {
  position: relative;
  color: var(--nav-text-dim);
  text-decoration: none;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 3px;
  padding: 12px 10px;
  transition: color 0.35s ease, text-shadow 0.35s ease, transform 0.35s ease;
  font-family: 'Noto Sans SC', sans-serif;
  text-transform: uppercase;
}

.index-nav.global-nav .nav-links a::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 10px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(0, 204, 255, 0.0), rgba(153, 51, 255, 0.0));
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.index-nav.global-nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 10%;
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--nav-secondary), var(--nav-primary), transparent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 0 16px rgba(0, 204, 255, 0.6);
}

.index-nav.global-nav .nav-links a:hover,
.index-nav.global-nav .nav-links a:focus,
.index-nav.global-nav .nav-links a.active {
  color: #fff;
  text-shadow:
    0 0 18px rgba(0, 204, 255, 0.85),
    0 0 36px rgba(153, 51, 255, 0.55);
  transform: translateY(-3px);
}

.index-nav.global-nav .nav-links a:hover::before,
.index-nav.global-nav .nav-links a:focus::before,
.index-nav.global-nav .nav-links a.active::before {
  background: linear-gradient(135deg, rgba(0, 204, 255, 0.5), rgba(153, 51, 255, 0.5));
  opacity: 1;
}

.index-nav.global-nav .nav-links a:hover::after,
.index-nav.global-nav .nav-links a:focus::after,
.index-nav.global-nav .nav-links a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Optional CTA button style in nav */
.index-nav.global-nav .nav-links a.nav-cta {
  padding: 11px 26px;
  border: 1px solid rgba(0, 204, 255, 0.4);
  border-radius: 28px;
  background: rgba(0, 204, 255, 0.08);
  color: var(--nav-secondary);
  font-weight: 600;
  letter-spacing: 1.5px;
  transition: all 0.35s ease;
}

.index-nav.global-nav .nav-links a.nav-cta:hover {
  background: rgba(0, 204, 255, 0.18);
  border-color: rgba(0, 204, 255, 0.75);
  box-shadow: 0 0 24px rgba(0, 204, 255, 0.25);
}

.index-nav.global-nav .nav-links a.nav-cta::after {
  display: none;
}

/* ===========================================================
   手機版漢堡按鈕 (預設隱藏，桌機不顯示)
   =========================================================== */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(153, 51, 255, 0.35);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  z-index: 1002;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: rgba(0, 204, 255, 0.6);
  box-shadow: 0 0 18px rgba(0, 204, 255, 0.25);
  outline: none;
  background: rgba(0, 204, 255, 0.05);
}
.nav-toggle:active { transform: scale(0.94); }

.nav-toggle-bars {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 22px;
  height: 16px;
  transform: translate(-50%, -50%);
}
.nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--nav-secondary), var(--nav-primary));
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(153, 51, 255, 0.6);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              top 0.3s ease 0s,
              opacity 0.25s ease;
}
.nav-toggle-bars span:nth-child(1) { top: 0; }
.nav-toggle-bars span:nth-child(2) { top: 7px; }
.nav-toggle-bars span:nth-child(3) { top: 14px; }

/* 漢堡 → X 動畫 */
.nav-toggle.is-active .nav-toggle-bars span:nth-child(1) {
  top: 7px;
  transform: rotate(45deg);
}
.nav-toggle.is-active .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
  transform: translateX(-12px);
}
.nav-toggle.is-active .nav-toggle-bars span:nth-child(3) {
  top: 7px;
  transform: rotate(-45deg);
}

/* ===========================================================
   手機版抽屜背景遮罩
   =========================================================== */
.nav-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0s linear 0.35s;
}
.nav-drawer-overlay.is-open {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.35s ease, visibility 0s linear 0s;
}

/* ===========================================================
   手機版右側滑入抽屜
   =========================================================== */
.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(82vw, 320px);
  height: 100vh;
  height: 100dvh;
  background: linear-gradient(
    180deg,
    rgba(10, 4, 22, 0.98) 0%,
    rgba(5, 0, 15, 0.99) 100%
  );
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
  border-left: 1px solid rgba(153, 51, 255, 0.25);
  box-shadow: -16px 0 48px rgba(0, 0, 0, 0.55),
              0 0 64px rgba(153, 51, 255, 0.08);
  z-index: 1001;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding-top: max(72px, env(safe-area-inset-top));
  padding-bottom: max(24px, env(safe-area-inset-bottom));
  visibility: hidden;
}
.nav-drawer.is-open {
  transform: translateX(0);
  visibility: visible;
}

.nav-drawer::before {
  content: '';
  position: absolute;
  top: 0;
  left: -1px;
  width: 1px;
  height: 100%;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(0, 204, 255, 0.5) 25%,
    rgba(153, 51, 255, 0.7) 50%,
    rgba(0, 204, 255, 0.5) 75%,
    transparent 100%
  );
  background-size: 100% 200%;
  animation: navBorderFlow 4s linear infinite;
  pointer-events: none;
}

.nav-drawer-header {
  padding: 18px 24px 12px;
  border-bottom: 1px solid rgba(153, 51, 255, 0.12);
}
.nav-drawer-title {
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--nav-secondary);
  text-shadow: 0 0 12px rgba(0, 204, 255, 0.4);
  text-transform: uppercase;
}
.nav-drawer-sub {
  font-size: 11px;
  color: var(--nav-text-dim);
  letter-spacing: 1.5px;
  margin-top: 4px;
  opacity: 0.7;
}

.nav-drawer-list {
  list-style: none;
  margin: 0;
  padding: 12px 0;
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-drawer-list li {
  position: relative;
}

.nav-drawer-list a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 24px;
  color: var(--nav-text);
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 2px;
  font-family: 'Noto Sans SC', sans-serif;
  position: relative;
  transition: background 0.25s ease, color 0.25s ease, padding-left 0.3s ease;
  -webkit-tap-highlight-color: transparent;
  min-height: 52px;
}
.nav-drawer-list a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 3px;
  height: 0;
  background: linear-gradient(180deg, var(--nav-secondary), var(--nav-primary));
  border-radius: 0 3px 3px 0;
  box-shadow: 0 0 12px rgba(153, 51, 255, 0.6);
  transition: height 0.3s ease, transform 0.3s ease;
}
.nav-drawer-list a::after {
  content: '';
  position: absolute;
  right: 24px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-top: 1.5px solid rgba(153, 51, 255, 0.5);
  border-right: 1.5px solid rgba(153, 51, 255, 0.5);
  transform: translateY(-50%) rotate(45deg);
  opacity: 0;
  transition: opacity 0.25s ease, right 0.3s ease;
}
.nav-drawer-list a:hover,
.nav-drawer-list a:focus-visible,
.nav-drawer-list a.active {
  color: #fff;
  background: linear-gradient(90deg, rgba(153, 51, 255, 0.12), transparent);
  padding-left: 32px;
  text-shadow: 0 0 12px rgba(0, 204, 255, 0.6);
  outline: none;
}
.nav-drawer-list a:hover::before,
.nav-drawer-list a:focus-visible::before,
.nav-drawer-list a.active::before {
  height: 60%;
  transform: translateY(-50%) scaleY(1);
}
.nav-drawer-list a:hover::after,
.nav-drawer-list a:focus-visible::after,
.nav-drawer-list a.active::after {
  opacity: 1;
  right: 18px;
}

/* 抽屜內的 CTA (登入/註冊) */
.nav-drawer-list a.nav-cta {
  margin: 8px 20px;
  padding: 12px 18px;
  border: 1px solid rgba(0, 204, 255, 0.4);
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 204, 255, 0.1), rgba(153, 51, 255, 0.06));
  color: var(--nav-secondary);
  justify-content: center;
  letter-spacing: 2.5px;
  font-weight: 700;
  min-height: 48px;
}
.nav-drawer-list a.nav-cta::before,
.nav-drawer-list a.nav-cta::after { display: none; }
.nav-drawer-list a.nav-cta:hover,
.nav-drawer-list a.nav-cta:focus-visible {
  background: linear-gradient(135deg, rgba(0, 204, 255, 0.2), rgba(153, 51, 255, 0.12));
  border-color: rgba(0, 204, 255, 0.75);
  box-shadow: 0 0 24px rgba(0, 204, 255, 0.25);
  padding-left: 18px;
}

.nav-drawer-list .nav-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(153, 51, 255, 0.2), transparent);
  margin: 8px 24px;
  list-style: none;
}

.nav-drawer-footer {
  padding: 14px 24px;
  border-top: 1px solid rgba(153, 51, 255, 0.12);
  font-size: 10px;
  font-family: 'Share Tech Mono', monospace;
  color: var(--nav-text-dim);
  letter-spacing: 1.5px;
  opacity: 0.6;
  text-align: center;
}

/* 鎖定 body 捲動 */
body.nav-drawer-open {
  overflow: hidden;
  touch-action: none;
}

/* ===========================================================
   響應式斷點
   =========================================================== */

@media (max-width: 1200px) {
  .index-nav.global-nav .nav-links { gap: 42px; }
  .index-nav.global-nav .nav-links a { font-size: 17px; letter-spacing: 2.4px; }
}

@media (max-width: 1100px) {
  .index-nav.global-nav .nav-links { gap: 32px; }
  .index-nav.global-nav .nav-links a {
    font-size: 16px;
    letter-spacing: 2px;
    padding: 10px 6px;
  }
  .index-nav.global-nav .nav-logo a { font-size: 16px; }
}

@media (max-width: 1024px) {
  .index-nav.global-nav .nav-links { gap: 24px; }
  .index-nav.global-nav .nav-links a {
    font-size: 14px;
    letter-spacing: 1.5px;
    padding: 8px 4px;
  }
}

@media (max-width: 900px) {
  .index-nav.global-nav { height: 70px; padding: 0 4%; }
  .index-nav.global-nav .nav-links { gap: 18px; }
  .index-nav.global-nav .nav-links a {
    font-size: 13px;
    letter-spacing: 1.2px;
    padding: 8px 2px;
  }
  .index-nav.global-nav .nav-logo a { font-size: 14px; }
  .index-nav.global-nav .nav-logo img { width: 34px; height: 34px; }
  .index-nav.global-nav .nav-logo em { display: none; }
}

/* ★★★ 手機版：漢堡 + 抽屜 ★★★ */
@media (max-width: 768px) {
  .index-nav.global-nav {
    height: 60px;
    padding: 0 16px;
  }

  /* 隱藏桌機水平選單 */
  .index-nav.global-nav .nav-links { display: none; }

  /* 顯示漢堡按鈕 */
  .nav-toggle { display: block; }

  /* Logo 自動縮放 */
  .index-nav.global-nav .nav-logo { gap: 8px; min-width: 0; flex: 1; }
  .index-nav.global-nav .nav-logo a {
    font-size: 13px;
    letter-spacing: 1px;
    gap: 8px;
    min-width: 0;
    overflow: hidden;
  }
  .index-nav.global-nav .nav-logo a > span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 60vw;
  }
  .index-nav.global-nav .nav-logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
  }
  .index-nav.global-nav .nav-logo em { display: none; }
}

/* 更小螢幕 (iPhone SE 等) */
@media (max-width: 380px) {
  .index-nav.global-nav { padding: 0 12px; }
  .index-nav.global-nav .nav-logo a { font-size: 12px; }
  .index-nav.global-nav .nav-logo img { width: 28px; height: 28px; }
  .nav-toggle { width: 40px; height: 40px; }
  .nav-drawer { width: min(88vw, 300px); }
  .nav-drawer-list a {
    font-size: 15px;
    padding: 14px 20px;
    min-height: 48px;
  }
  .nav-drawer-list a.nav-cta { margin: 6px 16px; }
}

/* 橫向手機 */
@media (max-height: 500px) and (orientation: landscape) {
  .nav-drawer-list a { padding: 10px 24px; min-height: 42px; }
}

/* 減少動畫偏好 */
@media (prefers-reduced-motion: reduce) {
  .nav-drawer,
  .nav-drawer-overlay,
  .nav-toggle-bars span { transition: none; }
  .index-nav.global-nav::after { animation: none; }
}