@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 76px;
    --primary-color: #4361ee;
    --primary-hover: #3a56d4;
    --bg-color: #f8f9fa;
    --sidebar-bg: #ffffff;
    --sidebar-color: #495057;
    --sidebar-hover-bg: #f8f9fa;
    --sidebar-active-bg: #eef2ff;
    --sidebar-active-color: #4361ee;
    --border-color: #e9ecef;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* Sidebar Styling */
#sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 2px 0 10px rgba(0,0,0,0.02);
    /* 以 flex 直向排列，標題固定、選單可捲動，避免螢幕較小時下方項目被截斷 */
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.sidebar-header h3 {
    margin: 0;
    font-weight: 700;
    font-size: 1.2rem;
    color: #2b2b2b;
}

.sidebar-footer {
    flex-shrink: 0;
    padding: 10px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: #8a8a8a;
}

.nav-menu {
    padding: 15px 0;
    list-style: none;
    margin: 0;
    /* 佔滿剩餘高度並於超出時垂直捲動 */
    flex: 1 1 auto;
    overflow-y: auto;
    overscroll-behavior: contain;
}

/* 細捲軸樣式，避免遮擋選單文字 */
.nav-menu::-webkit-scrollbar {
    width: 6px;
}
.nav-menu::-webkit-scrollbar-thumb {
    background-color: rgba(0,0,0,0.15);
    border-radius: 3px;
}
.nav-menu {
    scrollbar-width: thin;
}

.nav-menu li {
    padding: 2px 15px;
}

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    color: var(--sidebar-color);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-menu a:hover {
    background-color: var(--sidebar-hover-bg);
    color: var(--primary-color);
}

.nav-menu a.active {
    background-color: var(--sidebar-active-bg);
    color: var(--sidebar-active-color);
}

.nav-menu i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

/* ───── 側邊欄群組（可摺疊）───── */
.nav-group {
    padding: 2px 15px;
}
.nav-group-toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 15px;
    background: transparent;
    border: none;
    color: var(--sidebar-color);
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}
.nav-group-toggle:hover {
    background-color: var(--sidebar-hover-bg);
    color: var(--primary-color);
}
.nav-group-toggle .nav-group-title {
    flex: 1 1 auto;
}
.nav-group-toggle .nav-group-caret {
    width: auto;
    font-size: 0.75rem;
    transition: transform 0.2s ease;
}
/* 收合時箭頭朝右（Bootstrap 在收合狀態會加上 .collapsed） */
.nav-group-toggle.collapsed .nav-group-caret {
    transform: rotate(-90deg);
}
.nav-group-items {
    list-style: none;
    padding: 0;
    margin: 0;
}
/* 群組內子項目縮排，凸顯層級 */
.nav-group-items li {
    padding: 2px 0;
}
.nav-group-items a {
    padding-left: 28px;
    font-weight: 500;
}

/* Main Content Styling */
#main-content {
    margin-left: var(--sidebar-width);
    padding: 0;
    min-height: 100vh;
    transition: all 0.3s ease;
}

/* ───── 側邊欄收合狀態（僅顯示圖示）───── */
body.sidebar-collapsed #sidebar {
    width: var(--sidebar-collapsed-width);
}
body.sidebar-collapsed #main-content {
    margin-left: var(--sidebar-collapsed-width);
}
body.sidebar-collapsed .sidebar-header {
    justify-content: center;
    padding: 20px 0;
}
body.sidebar-collapsed .sidebar-header h3 {
    display: none;
}
body.sidebar-collapsed .nav-menu a {
    justify-content: center;
    gap: 0;
    font-size: 0;            /* 隱藏文字節點，保留圖示 */
}
body.sidebar-collapsed .nav-menu a i {
    font-size: 1.1rem;
    width: auto;
}
/* 收合時隱藏分區標題與分隔線 */
body.sidebar-collapsed .nav-menu .nav-item,
body.sidebar-collapsed .nav-menu hr {
    display: none;
}
/* 收合時隱藏群組標題按鈕，子項目攤平為純圖示且全部顯示 */
body.sidebar-collapsed .nav-group-toggle {
    display: none;
}
body.sidebar-collapsed .nav-group-items {
    display: block !important;
    height: auto !important;
}
body.sidebar-collapsed .nav-group-items a {
    padding-left: 15px;
}
body.sidebar-collapsed .sidebar-footer {
    justify-content: center;
    padding: 10px 0;
}
body.sidebar-collapsed .sidebar-footer-text {
    display: none;
}

/* 側邊欄切換按鈕 */
.sidebar-toggle {
    background: transparent;
    border: none;
    color: var(--sidebar-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px 10px;
    border-radius: 8px;
    line-height: 1;
    transition: background-color 0.2s ease, color 0.2s ease;
}
.sidebar-toggle:hover {
    background-color: var(--sidebar-hover-bg);
    color: var(--primary-color);
}

/* Top Navbar */
.top-navbar {
    background-color: #fff;
    height: 65px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 25px;
    justify-content: space-between;
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.content-wrapper {
    padding: 25px 30px;
}

/* Card Enhancements */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.06);
}

.table th {
    font-weight: 600;
    color: #495057;
    background-color: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
}

.table td {
    vertical-align: middle;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}