/* =========================================
   IPE 課程入口網頁 (Portal) 專屬樣式
   ========================================= */

/* =========================================
   1. 基礎變數與佈局 (IPE 官方標準架構)
   ========================================= */
.ipe-wrap {
    --ipe-gold: #C6A96B; --ipe-gold-light: #D8BE8A; --ipe-gold-dark: #B89A5F;
    --ipe-navy: #1B2836; --ipe-navy-light: #2C3E50; --ipe-bg: #F6F8FB; --ipe-gray: #5F6B7A;
    font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
    color: var(--ipe-gray); max-width: 1200px; margin: 0 auto; display: flex;
    flex-direction: column; background: #fff; box-shadow: 0 10px 40px rgba(0,0,0,0.05); box-sizing: border-box;
    padding: 80px 50px; text-align: center; border-radius: 12px;
    overflow-wrap: break-word;
}
.ipe-wrap * { box-sizing: border-box; }

.section-label { font-family: 'Noto Serif TC', serif; font-weight: 700; font-size: 14px; letter-spacing: 4px; color: var(--ipe-gold); text-transform: uppercase; margin-bottom: 15px; display: block; }
.ipe-chapter-title { font-size: 40px; color: var(--ipe-navy); margin: 0 0 20px 0; line-height: 1.4; font-family: 'Noto Serif TC', serif; font-weight: 900; }
.chapter-subtitle { font-size: 16px; color: var(--ipe-gray); margin-bottom: 60px; line-height: 1.8; max-width: 650px; margin-left: auto; margin-right: auto;}

/* =========================================
   2. 入口卡片網格 (Grid)
   ========================================= */
.portal-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

/* =========================================
   3. 懸浮卡片樣式
   ========================================= */
.portal-card {
    background: #fff;
    border: 1px solid #E6EAF0;
    border-radius: 16px;
    padding: 45px 30px;
    text-align: center;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.02);
}
.portal-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px;
    background: linear-gradient(to right, var(--ipe-gold-dark), var(--ipe-gold-light));
    opacity: 0; transition: opacity 0.3s ease;
}
.portal-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(27, 40, 54, 0.08);
    border-color: var(--ipe-gold-light);
}
.portal-card:hover::before { opacity: 1; }

.card-icon {
    width: 85px; height: 85px; background: var(--ipe-bg); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 34px; color: var(--ipe-navy); margin-bottom: 25px; transition: all 0.4s ease;
}
.portal-card:hover .card-icon { background: var(--ipe-navy); color: var(--ipe-gold-light); transform: scale(1.1); }

.card-title { font-size: 22px; color: var(--ipe-navy); font-weight: 900; font-family: 'Noto Serif TC', serif; margin: 0 0 15px 0; }
.card-desc { font-size: 15px; color: var(--ipe-gray); line-height: 1.6; margin: 0 0 30px 0; flex-grow: 1; }

.card-btn {
    background: var(--ipe-bg); color: var(--ipe-navy); padding: 12px 28px; border-radius: 50px;
    font-size: 14px; font-weight: bold; transition: all 0.3s ease; display: inline-flex; align-items: center; justify-content: center;
}
.portal-card:hover .card-btn { background: var(--ipe-gold); color: #fff; }

/* =========================================
   4. 手機版 RWD (加入按鈕體驗優化)
   ========================================= */
@media (max-width: 992px) {
    .portal-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .ipe-wrap { padding: 40px 20px; }
    .ipe-chapter-title { font-size: 28px; }
    .chapter-subtitle { font-size: 15px; margin-bottom: 40px; }
    .portal-grid { grid-template-columns: 1fr; gap: 20px; }
    .portal-card { padding: 35px 25px; }
    
    /* ★ 新增優化：手機版按鈕改為滿版寬度，方便單手點擊 */
    .card-btn { width: 100%; font-size: 15px; padding: 15px 20px; }
}