:root {
  color-scheme: light dark;
  --bg: #fdfbf7;
  --card-bg: #ffffff;
  --text: #2d2620;
  --muted: #6f6258;
  --border: #ebe4da;
  --accent: #8a5a2b;
  --accent-hover: #734a22;
  --accent-light: #f5eee6;
  --success: #5f8a5a;
  --success-light: #eef5ec;
  --danger: #b35959;
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161412;
    --card-bg: #1f1d1a;
    --text: #f4efe7;
    --muted: #c6bfb2;
    --border: #35312c;
    --accent: #d3a15f;
    --accent-hover: #e5b982;
    --accent-light: #2b2520;
    --success: #7da878;
    --success-light: #1c241a;
    --danger: #d97373;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 佈局 */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.container-wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

main {
  flex: 1;
}

/* 導覽列 - 升級磨砂玻璃質感 */
.nav-header {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  background-color: color-mix(in srgb, var(--bg) 80%, transparent);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

/* 擬真 App Icon 漸層風格 */
.logo-icon {
  background: linear-gradient(135deg, #a77c50, #8a5a2b);
  color: #ffffff;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 3px 6px rgba(138, 90, 43, 0.2);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
  .logo-icon {
    background: linear-gradient(135deg, #e5b982, #d3a15f);
    color: #161412;
    text-shadow: none;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.3);
  }
}

.logo-img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: block;
  object-fit: cover;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.logo-group:hover .logo-img {
  transform: scale(1.05);
  box-shadow: 0 4px 10px rgba(138, 90, 43, 0.15);
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

.nav-links a {
  margin-left: 28px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 24px;
  color: var(--text);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: clamp(1.1rem, 2.5vw, 1.25rem);
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

/* 按鈕 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent);
  color: #ffffff !important;
  padding: 14px 32px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(138, 90, 43, 0.15);
}

.btn:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 6px 16px rgba(138, 90, 43, 0.25);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px);
}

/* 卡片與網格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin: 40px 0 80px;
}

.feature-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(138, 90, 43, 0.04);
}

/* App 內用的 SF Symbols SVG 專用外觀 */
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background-color: var(--accent);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  transition: var(--transition);
}

.feature-card:hover .feature-icon svg {
  stroke: var(--card-bg);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 本地優先 Banner */
.privacy-banner {
  background-color: var(--accent-light);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  margin: 40px 0 80px;
  border: 1px solid var(--border);
}

.privacy-banner h2 {
  font-size: 1.8rem;
  margin: 0 0 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.privacy-banner p {
  max-width: 680px;
  margin: 0 auto;
  color: var(--muted);
  line-height: 1.7;
}

/* 常見問題 FAQ */
.faq-list {
  margin-top: 32px;
}

.faq-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.faq-card:hover {
  border-color: var(--accent);
}

.faq-card h3 {
  font-size: 1.15rem;
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.faq-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 表單樣式 */
.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.form-group label span {
  color: var(--danger);
  margin-left: 4px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 24px;
}

.checkbox-group input[type="checkbox"] {
  margin-top: 5px;
  cursor: pointer;
}

.checkbox-group label {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
  cursor: pointer;
  line-height: 1.5;
}

.checkbox-group label a {
  color: var(--accent);
  text-decoration: none;
}

.form-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 6px;
}

/* 狀態卡片 */
.status-card {
  padding: 40px;
  text-align: center;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: none;
  animation: fadeIn 0.3s ease;
}

.status-card.success {
  background-color: var(--success-light);
  border-color: var(--success);
  color: var(--success);
}

.status-card h3 {
  margin: 0 0 12px;
  font-size: 1.4rem;
}

.status-card p {
  margin: 0;
  color: var(--text);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 頁尾 */
footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

footer p {
  margin: 0 0 16px;
}

footer a {
  color: var(--muted);
  margin: 0 12px;
  text-decoration: none;
  transition: var(--transition);
}

footer a:hover {
  color: var(--accent);
}

/* 預覽區塊 */
.preview-section {
  text-align: center;
  padding: 80px 0;
  background-color: var(--accent-light);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 60px 0 0;
}

.preview-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin: 0 0 12px;
  color: var(--text);
  letter-spacing: -0.01em;
}

.preview-section p.subtitle {
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 48px;
  font-size: 1.05rem;
}

/* 輪播可視區：裁切超出範圍的卡片 */
.carousel-viewport {
  width: 100%;
  overflow: hidden;
}

.mockup-container {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 16px 24px;
  position: relative;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;

  /* 允許垂直捲動頁面，水平手勢由 JS 處理 */
  touch-action: pan-y;
  will-change: transform;
  transition: transform 0.4s ease;
}

.mockup-container.dragging {
  cursor: grabbing;
  transition: none;
}

.mockup-item {
  flex: 0 0 auto;
  text-align: center;

  /* 預設：清晰聚焦狀態 */
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
  transition: opacity 0.35s ease, transform 0.35s ease, filter 0.35s ease;
}

/* 動態霧化：由 JS 切換 */
.mockup-item.faded {
  opacity: 0.4;
  filter: blur(3px);
  transform: scale(0.9);
}

/* 輪播指示點 */
.carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.dot.active {
  background-color: var(--accent);
  transform: scale(1.25);
}

/* 宣傳卡片樣式 */
.promo-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  width: 200px;
  aspect-ratio: 1125 / 2436;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.promo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
  -webkit-user-drag: none;
}

/* 聚焦卡片的懸浮效果 */
.mockup-item:not(.faded):hover .promo-card {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(138, 90, 43, 0.15);
  border-color: var(--accent);
}


@media (max-width: 1024px) {
  .promo-card {
    width: 160px;
  }
  .mockup-container {
    gap: 12px;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 60px 0 40px;
  }
  .privacy-banner {
    padding: 32px 20px;
  }
  .nav-links a {
    margin-left: 16px;
  }
  .preview-section {
    padding: 60px 0;
  }
  .mockup-container {
    gap: 8px;
    padding: 16px 12px;
  }
  .promo-card {
    width: 120px;
  }
}