@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

body {
  font-family: 'Inter', sans-serif;
  color: #222;
  background-color: #fff;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* --- Header Bar --- */
.header-bar {
  position: fixed;
  top: 20px;
  left: 16px;
  right: 16px;
  padding: 12px 24px;
  border-radius: 16px;
  backdrop-filter: blur(20px);
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: space-between;
  transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
  opacity: 0;
  transform: translateY(-10px);
}

.header-bar.visible {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.header-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.header-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: #000;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-cta-btn {
  padding: 10px 24px;
  font-size: 14px;
  white-space: nowrap;
}

/* --- 語言切換（header-bar） --- */
.lang-switch {
  position: relative;
}

.lang-switch-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: 12px;
  background: transparent;
  color: #000;
  cursor: pointer;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.lang-switch-btn:hover {
  opacity: 0.75;
}

.lang-switch-btn[aria-expanded="true"] {
  opacity: 1;
}

.lang-switch-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 140px;
  margin: 0;
  padding: 8px;
  list-style: none;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  z-index: 1001;
}

.lang-switch-menu[hidden] {
  display: none !important;
}

.lang-switch-menu:not([hidden]) {
  display: block;
}

.lang-switch-item {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: #222;
  text-decoration: none;
  transition: background 0.15s ease;
}

.lang-switch-item:hover {
  background: rgba(0, 0, 0, 0.06);
}

.lang-switch-item.is-current {
  font-weight: 600;
  background: rgba(0, 0, 0, 0.08);
}

/* Hero 右上角語言切換（按鈕保留灰色底） */
.hero-lang {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 2;
}

.lang-switch--hero .lang-switch-btn {
  background: rgba(0, 0, 0, 0.06);
  transition: background 0.2s ease, color 0.2s ease;
  opacity: 1;
}

.lang-switch--hero .lang-switch-btn:hover {
  background: rgba(0, 0, 0, 0.1);
}

.lang-switch--hero .lang-switch-btn[aria-expanded="true"] {
  background: rgba(0, 0, 0, 0.12);
}

@media (max-width: 768px) {
  .hero-lang {
    top: 16px;
    right: 16px;
  }
}

section {
  padding: 80px 20px;
  text-align: center;
}

/* --- Hero 區 --- */
.hero {
  position: relative;
  height: 600px;
  color: #000;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
  z-index: 0;
}

.hero-content {
  position: absolute;
  top: 70%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  z-index: 1;
  padding: 40px 60px;
  border-radius: 20px;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-logo {
  width: 128px;
  height: 128px;
  object-fit: contain;
  margin-bottom: 20px;
}

.cta-btn {
  background-color: #000;
  color: #fff;
  border: none;
  border-radius: 25px;
  padding: 14px 36px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}
.cta-btn:hover { background-color: #333; }

/* --- 主題敘事區 --- */
.about {
  max-width: 700px;
  margin: auto;
  font-size: 18px;
  line-height: 1.8;
}

/* --- 功能亮點區 --- */
.features {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
}

@media (min-width: 769px) {
  .features {
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
  }
  
  .feature-list {
    order: 1;
    flex: 0 0 auto;
  }
  
  .feature-image {
    order: 2;
    flex: 0 0 auto;
    align-self: center;
  }
}

.feature-image {
  position: relative;
  max-width: 600px;
  width: 100%;
}

.feature-image img {
  max-width: 600px;
  width: 100%;
  border-radius: 20px;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.feature-image img.active {
  opacity: 1;
  position: relative;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 360px;
  width: 100%;
}

@media (max-width: 768px) {
  .feature-list {
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
    max-width: 100%;
    gap: 16px;
    padding: 0 20px;
  }
  
  .feature-list::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
  }
  
  .feature {
    flex: 0 0 calc(100% - 40px);
    min-width: calc(100% - 40px);
    scroll-snap-align: center;
  }
  
  .feature-indicators {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    width: 100%;
  }
  
  .indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease-in-out;
    cursor: pointer;
  }
  
  .indicator.active {
    background: #000;
    width: 24px;
    border-radius: 4px;
  }
}

@media (min-width: 769px) {
  .feature-indicators {
    display: none;
  }
}

.feature {
  padding: 24px;
  border-radius: 18px;
  background: rgba(255,255,255,0.55);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  cursor: pointer;
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background 0.3s ease-in-out, color 0.3s ease-in-out;
}

.feature:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.feature.active {
  background: #000;
  color: #fff;
}

.feature.active h3 {
  color: #fff;
}

.feature.active p {
  color: rgba(255, 255, 255, 0.9);
}

.feature h3 {
  margin-bottom: 10px;
  color: #007aff;
}

/* --- CTA 區 --- */
.cta {
  background: #f9f9f9;
}

/* --- 頁腳 --- */
footer {
  padding: 40px 20px;
  font-size: 14px;
  background: #fafafa;
  border-top: 1px solid #eee;
  text-align: center;
}
footer a {
  color: #007aff;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}

/* --- 彈窗樣式 --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.modal-overlay.show {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: #fff;
  border-radius: 20px;
  padding: 40px;
  max-width: 400px;
  width: calc(100% - 32px);
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transform: scale(0.9);
  transition: transform 0.3s ease-in-out;
}

.modal-overlay.show .modal-content {
  transform: scale(1);
}

.modal-content h3 {
  margin: 0 0 16px 0;
  font-size: 24px;
  font-weight: 600;
  color: #000;
}

.modal-content p {
  margin: 0 0 24px 0;
  font-size: 16px;
  line-height: 1.6;
  color: #666;
}

.modal-qrcode {
  margin: 24px 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal-qrcode img {
  max-width: 200px;
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.modal-close-btn {
  background-color: #000;
  color: #fff;
  border: none;
  border-radius: 25px;
  padding: 12px 32px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}

.modal-close-btn:hover {
  background-color: #333;
}

/* --- 響應式設計 --- */
@media (max-width: 768px) {
  .header-bar {
    padding: 10px 16px;
  }
  
  .header-title {
    font-size: 16px;
  }
  
  .header-cta-btn {
    padding: 8px 16px;
    font-size: 13px;
  }
  
  .header-logo {
    width: 28px;
    height: 28px;
  }
  
  .hero-content {
    left: 16px;
    right: 16px;
    width: auto;
    transform: translateY(-50%);
    padding: 30px 16px;
  }
}