/**
 * Custom Fonts - LINE Seed Font Family
 * 自定義字體配置 - LINE Seed 字體家族
 * 
 * 包含多種字重和樣式，適合中文和英文混排
 */

/* ===================================
   LINE Seed Sans (無襯線 - 英文)
   =================================== */

/* LINE Seed Sans - Regular (400) */
@font-face {
  font-family: 'LINE Seed Sans';
  src: url('../WOFF2/LINESeedSans_W_Rg.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap; /* 優化載入，先顯示備用字體 */
}

/* LINE Seed Sans - Bold (700) */
@font-face {
  font-family: 'LINE Seed Sans';
  src: url('../WOFF2/LINESeedSans_W_Bd.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ===================================
   LINE Seed TW (繁體中文)
   =================================== */

/* LINE Seed TW - Thin (100) */
@font-face {
  font-family: 'LINE Seed TW';
  src: url('../WOFF2/LINESeedTW_OTF_Th.woff2') format('woff2');
  font-weight: 100;
  font-style: normal;
  font-display: swap;
}

/* LINE Seed TW - Regular (400) */
@font-face {
  font-family: 'LINE Seed TW';
  src: url('../WOFF2/LINESeedTW_OTF_Rg.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* LINE Seed TW - Bold (700) */
@font-face {
  font-family: 'LINE Seed TW';
  src: url('../WOFF2/LINESeedTW_OTF_Bd.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* LINE Seed TW - Extra Bold (800) */
@font-face {
  font-family: 'LINE Seed TW';
  src: url('../WOFF2/LINESeedTW_OTF_Eb.woff2') format('woff2');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
}

/* ===================================
   統一字體家族 (推薦使用)
   =================================== */

/* 
 * 將 LINE Seed Sans 和 LINE Seed TW 合併為單一字體家族
 * 這樣可以用一個名稱同時支援中英文
 */
@font-face {
  font-family: 'LINE Seed';
  src: url('../WOFF2/LINESeedTW_OTF_Th.woff2') format('woff2');
  font-weight: 100;
  font-style: normal;
  font-display: swap;
  unicode-range: U+4E00-9FFF, U+3000-303F; /* 中文字符範圍 */
}

@font-face {
  font-family: 'LINE Seed';
  src: url('../WOFF2/LINESeedSans_W_Rg.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0020-007E, U+00A0-00FF; /* 英文字符範圍 */
}

@font-face {
  font-family: 'LINE Seed';
  src: url('../WOFF2/LINESeedTW_OTF_Rg.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+4E00-9FFF, U+3000-303F;
}

@font-face {
  font-family: 'LINE Seed';
  src: url('../WOFF2/LINESeedSans_W_Bd.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0020-007E, U+00A0-00FF;
}

@font-face {
  font-family: 'LINE Seed';
  src: url('../WOFF2/LINESeedTW_OTF_Bd.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+4E00-9FFF, U+3000-303F;
}

@font-face {
  font-family: 'LINE Seed';
  src: url('../WOFF2/LINESeedTW_OTF_Eb.woff2') format('woff2');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
  unicode-range: U+4E00-9FFF, U+3000-303F;
}

/* ===================================
   全局字體設定
   =================================== */

:root {
  /* 主要字體 */
  --font-primary: 'LINE Seed', 'Microsoft JhengHei', 'PingFang TC', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* 標題字體 (稍粗) */
  --font-heading: 'LINE Seed', 'Microsoft JhengHei', 'PingFang TC', 'Noto Sans TC', sans-serif;
  
  /* 內文字體 */
  --font-body: 'LINE Seed', 'Microsoft JhengHei', 'PingFang TC', 'Noto Sans TC', sans-serif;
}

/* 應用到全局 */
body {
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 標題使用 */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
  font-family: var(--font-heading);
  font-weight: 700;
}

/* 按鈕和導航 */
.btn,
.navbar,
.nav-link {
  font-family: var(--font-primary);
}

/* ===================================
   字重輔助類別
   =================================== */

.font-thin {
  font-weight: 100;
}

.font-light {
  font-weight: 300;
}

.font-normal,
.font-regular {
  font-weight: 400;
}

.font-medium {
  font-weight: 500;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.font-extrabold {
  font-weight: 800;
}

.font-black {
  font-weight: 900;
}

/* ===================================
   性能優化
   =================================== */

/* Preload 最常用的字體（建議在 HTML head 中使用） */
/*
<link rel="preload" href="WOFF2/LINESeedTW_OTF_Rg.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="WOFF2/LINESeedTW_OTF_Bd.woff2" as="font" type="font/woff2" crossorigin>
*/

/* 文字選取顏色 */
::selection {
  background-color: #ff4816;
  color: white;
}

::-moz-selection {
  background-color: #ff4816;
  color: white;
}