:root {
  /* Color Palette (Light Mode - Bento Style) */
  --bg-color: #f8fafc; /* Very light slate */
  --card-bg: #ffffff;
  --text-main: #0f172a; /* Slate 900 */
  --text-muted: #64748b; /* Slate 500 */
  --accent-color: #f97316; /* Warm Orange from logo */
  --accent-light: rgba(249, 115, 22, 0.1);
  --border-color: #e2e8f0; /* Slate 200 */
  --primary: #f97316; /* 核心橘色 */
  --primary-hover: #ea580c;
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.5);
  --button-hover: #ea580c;
  --bento-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  --bento-hover-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --bento-radius: 4px; /* 直線硬朗風格 */
}

[data-theme="dark"] {
  /* Color Palette (Dark Mode) */
  --bg-color: #0f172a; /* Deep slate */
  --card-bg: #1e293b;
  --text-main: #f1f5f9; /* Light slate */
  --text-muted: #94a3b8; /* Slate 400 */
  --accent-color: #f97316; /* Warm Orange from logo */
  --accent-light: rgba(249, 115, 22, 0.15);
  --border-color: #334155; /* Slate 700 */
  --glass-bg: rgba(30, 41, 59, 0.85);
  --glass-border: rgba(255, 255, 255, 0.1);
  --button-hover: #ea580c;
  --bento-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  --bento-hover-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 10;
}

/* 簡單明亮的背景 */
.bg-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-color: var(--bg-color);
}

/* Header */
header {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
  background: var(--glass-bg);
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--text-main);
}

.nav-links a.btn {
  color: #fff;
}

/* Language Selector */
.lang-selector {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: rgba(0,0,0,0.04);
  padding: 0.25rem;
  border-radius: 100px;
}

.lang-btn {
  background: none;
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem 0.75rem;
  border-radius: 4px; /* 直線硬朗 */
  transition: all 0.2s ease;
  font-family: inherit;
}

.lang-btn:hover {
  color: var(--text-main);
}

.lang-btn.active {
  background: #fff;
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.lang-divider {
  width: 1px;
  height: 14px;
  background: rgba(0,0,0,0.1);
}

[data-theme="dark"] .lang-selector {
  background: rgba(255,255,255,0.05);
}

[data-theme="dark"] .lang-btn.active {
  background: #334155;
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

[data-theme="dark"] .lang-divider {
  background: rgba(255,255,255,0.1);
}

/* Theme Toggle Button */
.theme-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-btn:hover {
  color: var(--text-main);
  background: rgba(0,0,0,0.05);
}

[data-theme="dark"] .theme-btn:hover {
  background: rgba(255,255,255,0.05);
}

.theme-icon-sun {
  display: none;
}
.theme-icon-moon {
  display: inline-block;
}

[data-theme="dark"] .theme-icon-sun {
  display: inline-block;
}
[data-theme="dark"] .theme-icon-moon {
  display: none;
}

/* Hero Section */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
}

.hero-content {
  margin-bottom: 4rem;
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 4rem;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -1.5px;
}

.hero p {
  font-size: 1.35rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 3rem;
  font-weight: 400;
}

.cta-group {
  display: flex;
  flex-wrap: wrap; /* 允許折行，避免按鈕過度擁擠 */
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.btn {
  padding: 0 1.5rem;
  height: 48px; /* 統一固定高度 */
  border-radius: 4px; /* 直線硬朗風格 */
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s ease-in-out;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff !important; /* 強制白色文字確保在橘色背景上的可見性 */
  border: 1px solid var(--primary);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: scale(0.98);
}

.btn-secondary {
  background: rgba(0,0,0,0.05);
  border: 1px solid transparent;
  color: var(--text-main);
}

.btn-secondary:hover:not([style*="cursor: not-allowed"]) {
  background: rgba(0,0,0,0.08);
  transform: scale(0.98);
}

/* Bento Box Grid Features */
.features {
  padding: 4rem 0 8rem;
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: minmax(280px, auto);
  gap: 1.5rem;
}

/* Bento Box Cards */
.bento-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--bento-radius); /* 使用小圓角變數 */
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 大卡片跨兩格 */
.bento-card.card-large {
  grid-column: span 2;
}

.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  color: var(--accent);
  width: 36px;
  height: 36px;
  margin-bottom: 1.5rem;
}

.bento-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.bento-card p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.5;
}

/* Pricing Section */
.pricing {
  padding: 6rem 0;
  background-color: var(--bg-color);
}

.price-container {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap; /* 允許價格在此處斷行 */
  margin-top: 1rem;
  gap: 1rem;
}

.price-option {
  display: flex;
  align-items: baseline;
  white-space: nowrap; /* 保持金額與單位在一行 */
}

.price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-unit {
  font-size: 1rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.free-card {
  border: 1px solid var(--border-color);
}

.pro-card {
  position: relative;
  border: 2px solid var(--accent-light);
  background-image: linear-gradient(to bottom right, var(--card-bg), rgba(249, 115, 22, 0.03));
}

[data-theme="dark"] .pro-card {
  background-image: linear-gradient(to bottom right, var(--card-bg), rgba(249, 115, 22, 0.1));
}

.pro-badge {
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--accent-color);
  color: white;
  padding: 0.25rem 1rem;
  border-bottom-left-radius: 4px; /* 直線硬朗風格：貼緊右上角 */
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.benefits-list {
  list-style: none;
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  width: 100%;
}

.benefits-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 500;
}

.benefit-icon {
  color: var(--accent);
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 3px;
}

/* Navigation Call to Action Section */
#download {
  padding: 8rem 0;
}

/* Footer Section */
.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4rem 0;
  border-top: 1px solid var(--glass-border);
}

.footer-links {
  display: flex;
  gap: 15px;
}

/* Footer Section */
.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4rem 0;
  border-top: 1px solid var(--glass-border);
}

.footer-links {
  display: flex;
  gap: 15px;
}

/* Responsive Updates */
@media (max-width: 1024px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .logo {
    font-size: 1.25rem;
  }
  .nav-links {
    gap: 0.5rem;
  }
  .nav-text-link {
    display: none;
  }
  .nav-links .btn-primary {
    display: none;
  }
  .lang-selector {
    padding: 0.15rem;
  }
  .lang-btn {
    padding: 0.25rem 0.5rem;
  }
  .btn-primary {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }
  .hero h1 {
    font-size: 2.8rem;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-card.card-large {
    grid-column: span 1;
  }
  .pro-card {
    padding: 2.5rem 1.5rem;
  }
}