/* --- 基礎設定與變數 --- */
:root { 
    --primary-color: #198754; 
    --primary-gradient: linear-gradient(135deg, #198754 0%, #20c997 100%); 
    --main-font: "Noto Sans TC", sans-serif; 
}

body { 
    background-color: #f8f9fa; 
    font-family: var(--main-font); 
}

/* --- Layout 樣式 --- */
footer { 
    margin-top: auto; 
    background-color: #e9ecef; 
    color: #6c757d; 
    font-size: 0.9rem; 
}

#loading-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(255, 255, 255, 0.7);
    z-index: 3000;
    display: flex; justify-content: center; align-items: center;
    backdrop-filter: blur(2px);
}

.hidden { display: none !important; }
.cursor-pointer { cursor: pointer; }
.hero-section { background: var(--primary-gradient); color: white; padding: 40px 0; margin-bottom: 20px; }

/* --- 導覽列與分頁標籤 --- */
.nav-link { cursor: pointer; font-weight: 500; }
.nav-link.active { color: var(--primary-color) !important; font-weight: bold; border-bottom: 2px solid var(--primary-color); }

.nav-pills .nav-link {
    color: #495057;
    background-color: transparent;
    font-weight: bold;
    border-radius: 5px;
    margin: 0 2px;
}
.nav-pills .nav-link:hover { background-color: #e9ecef; }
.nav-pills .nav-link.active {
    color: white !important;
    background-color: #198754 !important;
}

/* --- 彈窗 Modal 修正 --- */
/* 注意：在 GitHub Pages 使用 Bootstrap 5 時，如果背景黑幕遮擋，
   請確保 index.html 中引用的是 bootstrap.bundle.min.js */
.modal-backdrop { 
    pointer-events: none !important; 
    display: none !important; 
}
.modal { background: rgba(0, 0, 0, 0.5); }
#viewPlanModal { z-index: 1055; }
#msgModal, #confirmModal { z-index: 1070; }
.tox-tinymce-aux { z-index: 3000 !important; }

/* --- 卡片與統計卡 --- */
.card { border: none; shadow: 0 2px 4px rgba(0,0,0,0.05); transition: transform 0.2s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0,0,0,0.1); }

.stat-card { border-radius: 15px; border: none; color: white; overflow: hidden; position: relative; }
.stat-card-blue { background: linear-gradient(135deg, #0d6efd 0%, #0dcaf0 100%); }
.stat-card-red { background: linear-gradient(135deg, #d63384 0%, #dc3545 100%); }
.stat-icon { font-size: 3rem; opacity: 0.2; position: absolute; right: 10px; bottom: -10px; }
.stat-num { font-size: 1.5rem; font-weight: bold; }

/* --- 標籤與按鈕類型 --- */
.badge-word { background-color: #0d6efd; color: white; } 
.badge-ppt { background-color: #d9534f; color: white; } 
.badge-public { background-color: #198754; color: white; } 
.badge-member { background-color: #fd7e14; color: white; } 

.btn-outline-word { color: #0d6efd; border-color: #0d6efd; }
.btn-outline-word:hover { background-color: #0d6efd; color: white; }
.btn-outline-ppt { color: #d9534f; border-color: #d9534f; }
.btn-outline-ppt:hover { background-color: #d9534f; color: white; }

.btn-word, .btn-word:active, .btn-word.active { 
    background-color: #0d6efd !important; color: white !important; border-color: #0d6efd !important; 
}
.btn-ppt, .btn-ppt:active, .btn-ppt.active { 
    background-color: #d9534f !important; color: white !important; border-color: #d9534f !important; 
}

/* --- 內容呈現與分頁 --- */
.pagination { justify-content: center; margin-top: 20px; }
.page-item.active .page-link { background-color: var(--primary-color); border-color: var(--primary-color); }

.content-preview {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 4.5em; 
}
.content-preview img { display: none; }

/* --- Dcard 風格與預覽視窗 --- */
.floor-tag { font-size: 0.85rem; font-weight: bold; color: #198754; margin-right: 5px; }
.sub-comment { margin-left: 20px; padding-left: 15px; border-left: 3px solid #e9ecef; margin-top: 8px; background-color: #f8f9fa; padding: 10px; border-radius: 8px; }
.btn-like { cursor: pointer; color: #adb5bd; border: none; background: none; padding: 0; display: inline-flex; align-items: center; }
.btn-like.liked { color: #dc3545; }
.like-count { font-size: 0.9rem; margin-left: 4px; color: #6c757d; }
.reply-ref { color: #0d6efd; font-weight: bold; cursor: pointer; }

#ref-preview-box {
    position: absolute;
    background: white;
    border: 1px solid #dee2e6;
    border-radius: 12px;
    padding: 12px 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    z-index: 10000; 
    max-width: 350px;
    min-width: 250px;
    display: none;
    line-height: 1.5;
    max-height: 300px; 
    overflow-y: auto; 
}
#ref-preview-box img { max-width: 100%; border-radius: 4px; }

/* --- 動畫特效 --- */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    50% { transform: translateX(8px); }
    75% { transform: translateX(-8px); }
}

.shake-error {
    animation: shake 0.3s ease-in-out;
    border-color: #dc3545 !important;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25) !important;
}