:root {
    --bg-color: #fff5e9;
    --primary: #A67B5B;
    --primary-hover: #8B5A2B;
    --secondary: #D4A373;
    --text-main: #333;
    --card-bg: #ffffff;
    --d1: #fbdc8e;
    --d2: #ffc6c6;
    --d3: #c4e1dd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0; padding: 0; line-height: 1.6;
}

header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 15px 20px;
}

.header-content {
    max-width: 1000px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
}

.logo { max-height: 50px; }
.admin-link { color: var(--primary); text-decoration: none; font-weight: bold; }

.container { max-width: 1000px; margin: 30px auto; padding: 0 20px; }

.card {
    background: var(--card-bg); padding: 30px;
    border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); margin-bottom: 20px;
}

.split-card {
    display: flex; background: var(--card-bg); border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05); padding: 30px; gap: 30px;
}
.split-left { flex: 1; }
.split-right { flex: 1; }
.divider { width: 1px; background: #eee; }

@media(max-width: 768px) {
    .split-card { flex-direction: column; }
    .divider { width: 100%; height: 1px; }
}

.main-tabs { display: flex; gap: 10px; margin-bottom: 20px; }
.tab-btn {
    padding: 10px 20px; border: none; background: #e0d5c1;
    cursor: pointer; border-radius: 6px; font-weight: bold; font-size: 16px;
}
.tab-btn.active { background: var(--primary); color: #fff; }
.tab-content { display: none; }
.tab-content.active { display: block; }

.day-tabs { display: flex; gap: 10px; margin-bottom: 20px; }
.day-btn { padding: 10px 20px; border: none; border-radius: 6px; font-weight: bold; cursor: pointer; transition: 0.2s; }
.day-btn.d1 { background: var(--d1); } .day-btn.d1:hover { filter: brightness(0.9); }
.day-btn.d2 { background: var(--d2); } .day-btn.d2:hover { filter: brightness(0.9); }
.day-btn.d3 { background: var(--d3); } .day-btn.d3:hover { filter: brightness(0.9); }

.form-group { margin-bottom: 15px; }
label { display: block; font-weight: bold; margin-bottom: 5px; }
input, select {
    width: 100%; padding: 10px; border: 1px solid #ccc;
    border-radius: 6px; box-sizing: border-box;
}

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
@media(max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }

button { cursor: pointer; transition: 0.3s; }
.btn-primary { background: var(--primary); color: #fff; padding: 10px 20px; border: none; border-radius: 6px; font-weight: bold; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: #eee; color: #333; padding: 10px 20px; border: none; border-radius: 6px; font-weight: bold; }
.btn-secondary:hover { background: #ddd; }
.full-width { width: 100%; }

.sys-msg { color: var(--primary-hover); font-weight: bold; margin-top: 10px; }
.tc-list { padding-left: 20px; color: #555; }
.tc-list li { margin-bottom: 10px; }

.session-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 15px; }
.session-card {
    border: 2px solid var(--primary); padding: 15px; border-radius: 8px;
    text-align: center; background: #fff;
}
.session-card button { background: var(--secondary); margin-top: 10px; border: none; padding: 5px 10px; border-radius: 4px; color:#fff; font-weight:bold;}
.session-card button:hover { background: var(--primary); }
.session-card button:disabled { background: #ccc; cursor: not-allowed; }

.selection-footer { margin-top: 30px; padding: 15px; background: #f9f9f9; border-radius: 8px; border-left: 5px solid var(--primary); }

/* Modal 彈出視窗更新 */
.modal { 
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; 
    background: rgba(0,0,0,0.6); z-index: 1000; 
}
.modal-content { 
    background: #fff; max-width: 400px; width: 90%;
    /* 使用絕對置中取代原本的 margin: 100px auto; 確保不會被推出螢幕外 */
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    padding: 30px; border-radius: 8px; 
    max-height: 85vh; /* 限制最高只能佔螢幕 85% 高度 */
    overflow-y: auto; /* 內容過多時顯示內部滾動條 */
    box-sizing: border-box; /* 確保 padding 不會撐破容器 */
}
.modal-content.large { max-width: 700px; }
.close { position: absolute; right: 20px; top: 15px; font-size: 24px; cursor: pointer; z-index: 10; }

/* Admin Table */
.filter-bar { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.filter-bar input, .filter-bar select { padding: 8px; border: 1px solid #ccc; border-radius: 4px; }
.btn-print { background: #4caf50; color: #fff; padding: 8px 15px; border: none; border-radius: 4px; }

.table-responsive { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px; border: 1px solid #ddd; text-align: left; }
th { background: var(--primary); color: #fff; }

@media print {
    body * { visibility: hidden; }
    #adminDashboard, #adminDashboard * { visibility: visible; }
    #adminDashboard { position: absolute; left: 0; top: 0; width: 100%; }
    .filter-bar { display: none; }
}

/* 限制 Modal 高度並允許滾動，解決畫面被切斷的問題 */
.modal-content {
    max-height: 90vh;
    overflow-y: auto;
}

/* Check Status 表格樣式 */
.status-table {
    width: 100%; border-collapse: collapse; margin-top: 15px;
}
.status-table td {
    padding: 10px; border: 1px solid #ddd; text-align: left;
}
.status-table td:first-child {
    font-weight: bold; background: #f9f9f9; width: 35%;
}

/* 讀取中動畫文字 */
.loading-msg {
    text-align: center; font-weight: bold; color: var(--primary); margin: 20px 0;
}