/**
 * Biz.lat - 主要樣式表
 * Business & Enterprise Tech Platform
 *
 * 設計風格：Apple / Stripe / Linear / Vercel
 * 特色：極簡、留白、現代、專業
 *
 * 使用 CSS Variables 統一管理設計權杖
 * 支援 Light/Dark Mode (未來擴充)
 */

/* ==================== CSS Variables (Design Tokens) ==================== */
:root {
  /* --- 主色調 --- */
  --color-primary: #111827;
  --color-secondary: #4F46E5;
  --color-background: #F8FAFC;
  --color-card: #FFFFFF;
  --color-accent: #2563EB;

  /* --- 文字顏色 --- */
  --color-text-primary: #111827;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-text-inverse: #FFFFFF;

  /* --- 邊框與陰影 --- */
  --color-border: #E5E7EB;
  --color-border-hover: #D1D5DB;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* --- 字體 --- */
  --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* --- 間距系統 (8px Grid) --- */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* --- 字型大小 --- */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* --- 圓角 --- */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* --- 轉場 --- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* --- 容器寬度 --- */
  --max-width: 1200px;
  --content-width: 640px;
}

/* ==================== Reset & Base Styles ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== 無障礙：Skip Link ==================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-sm);
  z-index: 100;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-sm);
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ==================== Header ==================== */
.header {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-md);
}

.header__container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* --- Logo --- */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  text-decoration: none;
  color: var(--color-primary);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.logo:focus {
  outline: 2px solid var(--color-secondary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.logo__icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo__text {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.025em;
}

/* ==================== Main Content ==================== */
.main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.content {
  max-width: var(--content-width);
  width: 100%;
  text-align: center;
}

/* ==================== Hero Section ==================== */
.hero {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards;
}

/* --- 狀態徽章 --- */
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-secondary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

/* --- 主標題 --- */
.hero__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

/* --- 副標題 --- */
.hero__subtitle {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.5;
}

/* --- 分隔線 --- */
.hero__divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  border-radius: var(--radius-full);
  margin: 0 auto var(--spacing-lg);
}

/* --- 描述內容 --- */
.hero__description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 480px;
  margin: 0 auto;
}

.hero__description p + p {
  margin-top: var(--spacing-sm);
}

/* ==================== Footer ==================== */
.footer {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
}

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ==================== Animations ==================== */

/**
 * Fade In Up
 * 讓頁面元素從下方淡入
 */
@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/**
 * Pulse
 * 脈衝動畫，用於狀態指示器
 */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

/* ==================== Responsive Design ==================== */

/* --- Tablet (768px 以下) --- */
@media (max-width: 768px) {
  .hero__title {
    font-size: var(--text-3xl);
  }

  .hero__subtitle {
    font-size: var(--text-lg);
  }

  .main {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}

/* --- Mobile (480px 以下) --- */
@media (max-width: 480px) {
  .hero__title {
    font-size: var(--text-2xl);
  }

  .hero__subtitle {
    font-size: var(--text-base);
  }

  .logo__text {
    font-size: var(--text-xl);
  }

  .logo__icon {
    width: 32px;
    height: 32px;
  }

  .header {
    padding: var(--spacing-md);
  }

  .footer {
    padding: var(--spacing-md);
  }
}

/* ==================== 無障礙：減少動畫 ==================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ==================== 列印樣式 ==================== */
@media print {
  body {
    background: white;
    color: black;
  }

  .hero__badge {
    border: 1px solid #ccc;
    box-shadow: none;
  }

  .hero__divider {
    background: #ccc;
  }

  .skip-link {
    display: none;
  }
}