/* === Microsoft Fluent Design Inspired Palette & Styles === */
        :root {
            /* Primary & Accents */
            --primary-color: #0067c6;       /* Microsoft Blue */
            --primary-color-hover: #005da6; /* Darker Blue */
            --secondary-color: #6c757d;   
            
            /* Backgrounds */
            --bg-color: #f2f2f2;        /* Light Gray Background */
            --panel-bg-color: #ffffff;
            --header-bg-color: #ffffff;
            --title-highlight-bg: rgba(0, 103, 198, 0.07);
            --card-header-bg: rgba(0, 103, 198, 0.1);

            /* Typography */
            --font-color: #333333;        /* Dark Gray for Text */
            --font-color-light: #555555;

            /* Borders & Shadows (Fluent UI Style - Enhanced) */
            --border-color: #e0e0e0;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.06);
            --shadow-md: 0 5px 12px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);

            /* Status Colors */
            --status-red: #d83b01;
            --status-yellow: #ffb900;
            --status-green: #107c10;
            --status-red-bg: #fde7e9;
            --status-yellow-bg: #fff4ce;
            --status-green-bg: #dff6dd;
            --status-gray-bg: #f5f5f5;
             --status-blue-bg: #e3f2fd;       /* 淡蓝色背景 */
            --status-light-red-bg: #ffebee;  /* 淡红色背景 */
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
            background-color: var(--bg-color);
            color: var(--font-color);
            margin: 0;
            display: flex;
            flex-direction: column;
            height: 100vh;
            overflow: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* REQ 5: Header Background & Style */
        .platform-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.75rem 1.5rem;
            margin-bottom: 1.5rem;
            background: linear-gradient(90deg, var(--primary-color) 0%, #0078d4 100%);
            color: white;
            box-shadow: var(--shadow-md);
            flex-shrink: 0;
        }
        .header-main-content { display: flex; align-items: center; gap: 1.5rem; }
        .header-title-group { 
            display: flex; 
            align-items: center; 
            gap: 0.75rem;
        }
        .header-title-group .fas {
            font-size: 2rem;
            color: white;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .platform-header h1 {
            font-size: 1.75rem;
            font-weight: 600;
            color: white;
            margin: 0;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        #datetime-display {
            font-size: 1.25rem;
            font-weight: 600;
            color: white;
            letter-spacing: 0.5px;
            opacity: 0.9;
        }

        .nav-icons { display: flex; gap: 0.35rem; }

        .nav-icon {
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            cursor: pointer; 
            color: white;
            transition: all 0.2s ease-in-out;
            border: none; background: none; padding: 0.2rem; border-radius: 6px; width: 65px;
        }
        .nav-icon:hover { 
            background-color: rgba(255,255,255,0.15); 
            transform: translateY(-2px);
        }
        .nav-icon i { font-size: 1.35rem; opacity: 0.9; }
        .nav-icon span { font-size: 0.7rem; margin-top: 0.2rem; opacity: 0.9; }
        
        .nav-icon[data-bs-target="#studentManagementModal"] i,
        .nav-icon[data-bs-target="#subjectManagementModal"] i,
        .nav-icon[data-bs-target="#progressModal"] i,
        .nav-icon[data-bs-target="#largeScreenModal"] i,
        .nav-icon[data-bs-target="#resetSystemModal"] i { color: white; }
        
        .page-container {
             padding: 0 1.5rem 1.5rem 1.5rem;
             display: flex;
             flex-grow: 1;
             min-height: 0;
        }
        .main-container { display: flex; flex-grow: 1; gap: 1.5rem; min-height: 0; }
        
        /* REQ 3: Enhanced Panel Shadows & Hover */
        .content-panel {
            background-color: var(--panel-bg-color); border-radius: 8px; border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm); padding: 1.5rem; display: flex; flex-direction: column;
            overflow: hidden; transition: box-shadow 0.3s ease, transform 0.3s ease;
        }
        .content-panel:focus-within, .content-panel:hover { 
            box-shadow: var(--shadow-lg); 
            transform: translateY(-4px);
        }
        .content-panel-left { width: calc(33.333% - 0.75rem); }
        .content-panel-right { width: calc(66.667% - 0.75rem); }

        .content-panel-left .panel-header {
            font-size: 1.25rem; font-weight: 600; margin: -1.5rem -1.5rem 1.5rem -1.5rem; padding: 1rem 1.5rem;
            border-bottom: 1px solid var(--border-color); color: var(--primary-color);
            background-color: var(--title-highlight-bg);
            border-top-left-radius: 8px; border-top-right-radius: 8px;
        }
        .right-panel-header {
            margin: -1.5rem -1.5rem 1.5rem -1.5rem;
            padding: 0.75rem 1.5rem;
            background-color: var(--title-highlight-bg);
            border-bottom: 1px solid var(--border-color);
            border-top-left-radius: 8px; border-top-right-radius: 8px;
        }
        .right-panel-header h2 {
            font-size: 1.25rem; font-weight: 600; color: var(--primary-color);
            margin: 0;
        }
        
        .panel-body { flex-grow: 1; overflow-y: auto; padding-right: 10px; }

        ::-webkit-scrollbar { width: 4px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: #0067c6; border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: #ffb900; }
        
        .main-modal .modal-dialog {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  min-height: 100vh;
  width: calc(100vw - 40px);
  max-width: calc(100vw - 40px);
  height: calc(100vh - 40px);
  max-height: calc(100vh - 40px);
}

        .main-modal .modal-content { height: 100%; display: flex; flex-direction: column; border-radius: 8px; border: none; box-shadow: var(--shadow-lg); }
        .main-modal .modal-body { overflow-y: auto; flex-grow: 1; }
        .modal.fade .modal-dialog { transition: transform .3s ease-out, opacity .3s ease-out; transform: translateY(-20px); opacity: 0; }
        .modal.show .modal-dialog { transform: translateY(0); opacity: 1; }
        .modal-header { background-color: var(--primary-color); color: white; padding: 1rem 1.5rem; border-top-left-radius: 7px; border-top-right-radius: 7px;}
        .modal-header .btn-close { filter: invert(1) grayscale(100%) brightness(200%); }
        /* 将子模态加宽：更接近 2× 原宽度，同时不超过视口 */
        .sub-modal .modal-dialog {
        width: 90vw;          /* 视口 90% 宽度 */
        max-width: 1200px;    /* 上限以桌面舒适宽度为目标 */
        }

        .form-label { font-weight: 600; color: var(--font-color); }
        .form-control, .form-select { border-color: var(--border-color); transition: border-color .2s ease, box-shadow .2s ease; border-radius: 4px; }
        .form-control:focus, .form-select:focus { 
            border-color: var(--primary-color); 
            box-shadow: 0 0 0 3px rgba(0, 103, 198, 0.2); 
            outline: none;
        }
        
        .btn { transition: all 0.2s ease-in-out; border-radius: 4px; font-weight: 500;}
        .btn-primary { 
            background-color: var(--primary-color); 
            border-color: var(--primary-color); 
        }
        .btn-primary:hover { 
            background-color: var(--primary-color-hover); 
            border-color: var(--primary-color-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 103, 198, 0.3);
        }
        .btn-danger { background-color: var(--status-red); border-color: var(--status-red); }
        .btn-sm.btn-outline-success { color: var(--status-green); border-color: var(--status-green); }
        .btn-sm.btn-outline-success:hover { background-color: var(--status-green); color: white; }
        .btn-sm.btn-outline-danger { color: var(--status-red); border-color: var(--status-red); }
        .btn-sm.btn-outline-danger:hover { background-color: var(--status-red); color: white; }
        .btn-sm.btn-outline-primary { color: var(--primary-color); border-color: var(--primary-color); }
        .btn-sm.btn-outline-primary:hover { background-color: var(--primary-color); color: white; }


        .table thead { position: sticky; top: 0; z-index: 1; background-color: var(--panel-bg-color) !important; border-bottom: 2px solid var(--primary-color); }
        .table-hover tbody tr:hover { background-color: var(--title-highlight-bg); }
        
        .action-icons { display: flex; gap: 0.75rem; align-items: center; }
        .action-icons i { cursor: pointer; margin: 0; font-size: 1.1rem; color: var(--secondary-color); transition: transform 0.2s, color 0.2s; }
        .action-icons i:hover {
            transform: scale(1.25);
            text-shadow: 0 0 8px rgba(0,0,0,0.2);
        }

        .action-icons .fa-edit:hover { color: #f7630c; } 
        .action-icons .fa-trash-alt:hover { color: var(--status-red); }
        .action-icons .fa-print:hover { color: #0078d4; }
        .action-icons .fa-copy:hover { color: var(--status-green); }
        
        .checkbox-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
        .checkbox-tag input { display: none; }
        .checkbox-tag label { display: block; padding: 0.3rem 0.8rem; border: 1px solid var(--border-color); border-radius: 15px; cursor: pointer; transition: all 0.2s; }
        .checkbox-tag input:checked + label { background-color: var(--primary-color); color: white; border-color: var(--primary-color); }
        
        .grade-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
        .grade-tag {
            padding: 0.35rem 0.9rem;
            border: 1px solid var(--border-color);
            border-radius: 15px;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 0.9rem;
        }
        .grade-tag:hover {
            border-color: var(--primary-color-hover);
            color: var(--primary-color-hover);
        }
        .grade-tag.selected {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            font-weight: 500;
        }

        .classmate-tags-container {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            margin-top: 1rem;
            padding: 0.75rem;
            border: 1px dashed var(--border-color);
            border-radius: 6px;
        }
        .classmate-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
        .classmate-tag {
            padding: 0.25rem 0.75rem;
            border-radius: 15px;
            background-color: var(--bg-color);
            border: 1px solid var(--border-color);
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .classmate-tag.selected {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .homework-item { display: flex; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid #f7fafc; }
        .homework-item:last-child { border-bottom: none; }
        .homework-text { flex-grow: 1; padding-right: 1rem; }
        .homework-actions-wrapper { display: flex; align-items: center; flex-shrink: 0; gap: 0.75rem; }
        .homework-status-select { width: 105px; }
        
        .student-homework-card { border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 1rem; background-color: var(--panel-bg-color); box-shadow: var(--shadow-sm); transition: box-shadow 0.2s; }
        .student-homework-card:hover { box-shadow: var(--shadow-md); }
        .student-homework-card-header { background-color: var(--card-header-bg); padding: 0.75rem 1.25rem; font-weight: 600; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); border-top-left-radius: 8px; border-top-right-radius: 8px; }
        .student-homework-card-body { padding: 1.25rem; }
        .homework-subject-group { margin-bottom: 1rem; }
        .homework-subject-title { 
            font-weight: bold; color: var(--primary-color); margin-bottom: 0.75rem; 
            padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-color);
            display: flex; justify-content: space-between; align-items: center;
        }
        
        .status-uncompleted, .status-partial, .status-completed, .status-none { background-color: transparent; }

        #progressTableBody span { padding: 0.2em 0.6em; border-radius: 4px; font-weight: 500; font-size: 0.8rem; }
        .status-uncompleted-text { color: #c62828; background-color: var(--status-red-bg); }
        .status-partial-text { color: #f57f17; background-color: var(--status-yellow-bg); }
        .status-completed-text { color: #2e7d32; background-color: var(--status-green-bg); }
        .status-none-text { color: #4a5568; background-color: var(--status-gray-bg); }
        
        .large-screen-status-label {
            display: inline-block; flex-shrink: 0;
            width: 65px; padding: 0.15rem 0; margin-right: 0.75rem;
            border-radius: 4px; font-size: 0.7rem; font-weight: 600; text-align: center;
        }

        .large-screen-container { display: flex; height: 100%; gap: 1rem; }
        .grade-region { flex: 1; border: 1px solid var(--border-color); border-radius: 8px; display: flex; flex-direction: column; overflow: hidden; background-color: var(--bg-color); }
        .grade-region-header {
            padding: 0.75rem; font-size: 1.25rem; font-weight: 600; text-align: center;
            border-bottom: 1px solid var(--border-color); flex-shrink: 0;
            background-color: var(--primary-color); color: white;
        }
        .grade-region-body { padding: 1rem; overflow-y: auto; }
        .large-screen-card { background-color: var(--panel-bg-color); border-radius: 6px; margin-bottom: 1rem; box-shadow: var(--shadow-sm); overflow: hidden; }
        .large-screen-card-header {
            padding: 0.5rem 1rem; font-weight: 600; display: flex; justify-content: space-between; align-items: center;
            border-bottom: 1px solid var(--border-color);
            background-color: var(--card-header-bg);
            color: var(--font-color);
        }
        .large-screen-card-body { padding: 0.5rem 1rem; }
        .large-screen-subject-title { font-weight: bold; color: var(--primary-color); padding: 0.5rem 0; }
        .large-screen-homework-item { display: flex; align-items: center; padding: 0.3rem 0; }
        
        .large-screen-container .large-screen-status-label { color: white; }
        .large-screen-container .status-red-bg { background-color: #d83b01 !important;
  color: #ffffff !important; }
        .large-screen-container .status-green-bg { background-color: #107c10 !important;
  color: #ffffff !important; }
        .large-screen-container .status-yellow-bg { background-color: #ffb900 !important;
  color: #1e1e1e !important; }
        .large-screen-container .status-uncompleted-text,
        .large-screen-container .status-completed-text { color: inherit; }
        /* === 日期分组样式 === */
.large-screen-date-group {
  margin-bottom: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-left: 3px solid var(--primary-color);
  background-color: rgba(0,103,198,0.04);
  border-radius: 4px;
}

.large-screen-date-group .text-muted {
  font-weight: 600;
  color: var(--primary-color) !important;
  margin-bottom: 0.35rem;
}
.homework-date-group {
  margin-bottom: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-left: 3px solid var(--primary-color);
  background-color: rgba(0,103,198,0.04);
  border-radius: 4px;
}
.homework-date-group .text-muted {
  font-weight: 600;
  color: var(--primary-color) !important;
}

        .large-screen-homework-text {
            word-break: break-word;
            white-space: pre-wrap;
            line-height: 1.5;
        }
        
        @keyframes autoscroll { from { transform: translateY(0); } to { transform: translateY(-50%); } }
        .autoscroll-enabled { padding: 0; }
        .autoscroll-enabled .autoscroll-content { animation: autoscroll 60s linear infinite; }
        .autoscroll-enabled:hover .autoscroll-content { animation-play-state: paused; }

        .toast-container { position: fixed; top: 20px; right: 20px; z-index: 1080; }
        .custom-toast { display: flex; align-items: center; padding: 1rem 1.5rem; color: white; border-radius: 8px; box-shadow: var(--shadow-lg); opacity: 0; transition: opacity 0.3s, transform 0.3s; transform: translateX(100%); }
        .custom-toast.show { opacity: 1; transform: translateX(0); }
        .custom-toast.success { background-color: var(--status-green); }
        .custom-toast.error { background-color: var(--status-red); }
        .custom-toast.info { background-color: var(--primary-color); }
        
        .subject-icon { display: inline-flex; flex-direction: column; align-items: center; padding: 0.75rem; border: 1px solid var(--border-color); border-radius: 8px; cursor: pointer; min-width: 80px; transition: all .2s ease; }
        .subject-icon i { font-size: 1.75rem; margin-bottom: 0.5rem; color: var(--secondary-color); transition: all .2s ease;}
        .subject-icon span { font-size: 0.8rem; }
        .subject-icon.selected, .subject-icon:hover { border-color: var(--primary-color); background-color: var(--title-highlight-bg); transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .subject-icon.selected i, .subject-icon:hover i { color: var(--primary-color); }



/* === UPDATED: Style for dynamically added homework task groups (最终修复 - 负外边距对齐法) === */

/*父容器 (.subject-task-group): 恢复内容内边距，并启用圆角裁剪 */

        .subject-task-group {
  background-color: var(--panel-bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  padding: 1rem;
  margin-bottom: 1rem;
  overflow: hidden; /* 保证圆角裁剪 */
  transition: all 0.3s ease;
}
.subject-task-group:hover {
  border-color: var(--primary-color);
  box-shadow: 0 8px 20px rgba(0, 103, 198, 0.2);
  transform: translateY(-2px);
}
.subject-task-group > label.form-label {
  display: block;
  margin: -1rem -1rem 1rem -1rem;
  background-color: var(--card-header-bg);
  color: var(--font-color);
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
  width: auto;
  box-sizing: border-box;
}
.subject-task-group > textarea.form-control {
  border: none;
  resize: vertical;
  padding: 0;
  margin-bottom: 1rem;
  border-radius: 0;
  background-color: var(--panel-bg-color);
}
.subject-task-group > textarea.form-control:last-child {
  margin-bottom: 0;
}



        #progressGradeFilter .checkbox-tag label {
            padding: 0.15rem 0.4rem;
            font-size: 0.8rem;
            border-radius: 10px;
        }
        
        .large-screen-screenshot-icon {
            cursor: pointer;
            margin-left: 0.75rem;
            color: var(--secondary-color);
            transition: color 0.2s, transform 0.2s;
        }
        .large-screen-screenshot-icon:hover {
            color: var(--primary-color-hover);
            transform: scale(1.2);
        }

        /* 全局模态框强制居中 */
        .modal.show .modal-dialog {
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto;
            min-height: 100vh;
        }



        /* Dark Mode Styles for Fullscreen */
        #largeScreenModalBody.dark-mode { background-color: #121212 !important; }
        #largeScreenModalBody.dark-mode .grade-region { background-color: #00000000; border-color: #00000000; }
        #largeScreenModalBody.dark-mode .grade-region-header { background-color: #00000000; color: #f1f1f1; border-bottom-color: #00000000; }
        #largeScreenModalBody.dark-mode .large-screen-card { background-color: #2b2b2b; border: 1px solid #444; }
        #largeScreenModalBody.dark-mode .large-screen-card-header { background-color: #333; color: #d4ed31; border-bottom-color: #444; }
        #largeScreenModalBody.dark-mode .large-screen-subject-title { color: #e0e0e0; }
        #largeScreenModalBody.dark-mode .large-screen-homework-text { color: #c5c5c5; }
        #largeScreenModalBody.dark-mode .text-muted { color: #6c757d !important; }
        #largeScreenModalBody.dark-mode .large-screen-status-label { color: #ffffff; font-weight: bold; }
        #largeScreenModalBody.dark-mode .status-red-bg { background-color: #d83b01; }
        #largeScreenModalBody.dark-mode .status-green-bg { background-color: #107c10; }
        #largeScreenModalBody.dark-mode .status-yellow-bg { background-color: #ffb900; color: #1e1e1e; }

        /* 网络状态指示器样式 */
        .network-status {
            position: fixed;
            bottom: 1px;                 /* 垂直居中基准 */
            left: 1px;              /* 靠右边框 */
            transform: translateY(-50%); /* 向上偏移自身高度的一半，实现垂直居中 */
            padding: 8px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            z-index: 9999; /* Changed to be on top of everything */
            opacity: 0.8;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-md);
        }

        .network-status.online {
            background-color: var(--status-green);
            color: white;
        }

        .network-status.offline {
            background-color: var(--status-red);
            color: white;
        }

        .network-status.syncing {
            background-color: var(--status-yellow);
            color: var(--font-color);
        }

        .network-status.error {
            background-color: var(--status-red);
            color: white;
        }
        /* === 教育风格登录背景 & 悬浮登录框 (paste after existing styles) === */

/* 覆盖原来的简单背景，做分层光斑 + 纸格纹理 */
#loginOverlay {
  background-color: transparent !important; /* 覆盖 inline */
  background-image:
    radial-gradient(1200px 600px at 8% 18%, rgba(0,103,198,0.10), transparent 16%),
    radial-gradient(900px 500px at 92% 82%, rgba(0,150,200,0.06), transparent 20%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg-color) 100%);
  background-repeat: no-repeat;
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  z-index: 2000;
  overflow: hidden;
  transition: opacity .45s ease, visibility .45s ease;
}

/* 两个大模糊光斑，营造柔和层次 */
#loginOverlay::before,
#loginOverlay::after {
  content: "";
  position: absolute;
  pointer-events: none;
  filter: blur(28px);
  opacity: 0.34;
}
#loginOverlay::before {
  left: -12%;
  top: -8%;
  width: 62%;
  height: 62%;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.85), rgba(255,255,255,0.02) 40%);
  transform: rotate(-12deg);
}
#loginOverlay::after {
  right: -12%;
  bottom: -6%;
  width: 62%;
  height: 62%;
  background: radial-gradient(circle at 70% 70%, rgba(0,103,198,0.12), rgba(0,103,198,0) 40%);
  transform: rotate(8deg);
}

/* 轻微的“作业纸/网格”层（像方格纸/教学笔记） */
#loginOverlay .login-grid {
  position: absolute; inset: 0; pointer-events: none; z-index: 2;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 30px 30px, 30px 30px;
  mix-blend-mode: overlay;
  opacity: 0.20;
}

/* 装饰性的教育图标（FontAwesome），不影响交互 */
#loginOverlay .login-decor { position: absolute; inset:0; pointer-events: none; z-index: 3; }
#loginOverlay .login-decor .decor-icon {
  position: absolute;
  font-size: 68px;
  opacity: 0.08;
  color: var(--primary-color);
  transform-origin: center;
  filter: drop-shadow(0 6px 16px rgba(0,0,0,0.06));
}
#loginOverlay .login-decor .book  { left: 6%;  top: 18%; transform: rotate(-12deg); }
#loginOverlay .login-decor .pencil { right: 8%; bottom: 20%; transform: rotate(18deg); }
#loginOverlay .login-decor .cap    { left: 50%; top: 6%; transform: translateX(-50%) rotate(6deg); }

/* 悬浮卡片（登录框）—— 玻璃态 + 轻投影 + 漂浮动画 */
#loginBox {
  position: relative;
  z-index: 10;
  width: min(420px, 92%);
  padding: 2.25rem;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(255,255,255,0.84));
  box-shadow: 0 20px 60px rgba(3,46,86,0.18), 0 6px 20px rgba(3,46,86,0.08);
  border: 1px solid rgba(0,0,0,0.04);
  backdrop-filter: blur(8px) saturate(120%);
  -webkit-backdrop-filter: blur(8px) saturate(120%);
  transition: transform .35s ease, box-shadow .35s ease;
  animation: floatCard 6s ease-in-out infinite;
}

/* 登录卡片顶部的细长渐变条（视觉锚点） */
#loginBox::before {
  content: "";
  position: absolute;
  left: 50%; transform: translateX(-50%);
  top: -12px;
  width: 88px; height: 8px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-color-hover));
  box-shadow: 0 8px 20px rgba(0,103,198,0.18);
}

/* 轻柔的“漂浮”动画 */
@keyframes floatCard {
  0% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
  100% { transform: translateY(0); }
}

/* 表单微调 */
#loginBox .fas.fa-user-graduate {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
  text-shadow: 0 4px 18px rgba(0,103,198,0.08);
}

#loginBox h3 { margin-bottom: 1.2rem; color: var(--font-color); font-weight:600; }

#loginBox .form-control {
  border-radius: 8px;
  padding: .62rem .75rem;
  border: 1px solid var(--border-color);
  box-shadow: none;
}
#loginBox .btn-primary {
  border-radius: 8px;
  padding: .58rem 1rem;
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0,103,198,0.16);
}

/* 响应式 */
@media (max-width: 420px) {
  #loginOverlay .login-decor .decor-icon { font-size:46px; }
  #loginBox { padding: 1.2rem; border-radius: 12px; }
}
/* === 优化后的学生作业卡片样式（含暗色模式） === */

.student-homework-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 1rem;
  background-color: var(--panel-bg-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.student-homework-card-header {
  background-color: var(--primary-color);
  color: white;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
}

.student-homework-card-body {
  padding: 1.25rem;
  transition: background-color 0.3s ease;
}

/* 悬浮高亮效果 */
.student-homework-card:hover {
  /* background-color: rgba(0, 103, 198, 0.05); */
  border-color: var(--primary-color);
  box-shadow: 0 8px 20px rgba(0, 103, 198, 0.2);
  transform: translateY(-2px);
}

/* 暗色模式适配 */
#largeScreenModalBody.dark-mode .student-homework-card {
  background-color: #2b2b2b;
  border: 1px solid #444;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

#largeScreenModalBody.dark-mode .student-homework-card-header {
  background-color: #0078d4;
  color: #ffffff;
  border-bottom: 1px solid #555;
}

#largeScreenModalBody.dark-mode .student-homework-card-body {
  background-color: #2b2b2b;
  color: #e0e0e0;
}

#largeScreenModalBody.dark-mode .student-homework-card:hover {
  /* background-color: rgba(0, 103, 198, 0.1); */
  border-color: #0078d4;
  box-shadow: 0 10px 24px rgba(0,103,198,0.3);
}

/* 主页面作业卡片右侧图标悬浮颜色适配 */
.action-icons .fa-edit:hover {
  color: var(--status-yellow); /* 改为语义色：编辑 */
}
.action-icons .fa-trash-alt:hover {
  color: var(--status-red); /* 删除 */
}
.action-icons .fa-print:hover {
  color: var(--primary-color); /* 打印 */
}
.action-icons .fa-copy:hover {
  color: var(--status-green); /* 复制 */
}

/* 暗色模式下图标悬浮颜色增强 */
#largeScreenModalBody.dark-mode .action-icons i:hover {
  text-shadow: 0 0 6px rgba(255,255,255,0.2);
}


/* 暗色模式适配 */
#largeScreenModalBody.dark-mode .subject-task-group {
  background-color: #2b2b2b;
  border: 1px solid #444;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
#largeScreenModalBody.dark-mode .subject-task-group:hover {
  background-color: rgba(0, 103, 198, 0.1);
  border-color: #0078d4;
  box-shadow: 0 10px 24px rgba(0,103,198,0.3);
}

.large-screen-card {
  background-color: var(--panel-bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.large-screen-card:hover {
  background-color: transparent !important;
  border-color: transparent !important;
  box-shadow: inherit !important;
  transform: none !important;
}


/* 暗色模式适配 */
#largeScreenModalBody.dark-mode .large-screen-card {
  background-color: #2b2b2b;
  border: 1px solid #444;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
#largeScreenModalBody.dark-mode .large-screen-card:hover {
  background-color: rgba(0, 103, 198, 0.1);
  border-color: #0078d4;
  box-shadow: 0 10px 24px rgba(0,103,198,0.3);
}

/* 暗色模式下统一标题背景色 */
#largeScreenModalBody.dark-mode .student-homework-card-header,
#largeScreenModalBody.dark-mode .subject-task-group > label.form-label,
#largeScreenModalBody.dark-mode .large-screen-card-header {
  background-color: #0078d4;
  color: #ffffff;
}
/* 暗色模式下：日期文字高亮 */
#largeScreenModalBody.dark-mode .large-screen-date-group .text-muted {
  color: #ffffff !important;
  font-weight: 600;
}

/* 暗色模式下：作业任务文字高亮 */
#largeScreenModalBody.dark-mode .large-screen-homework-text {
  color: #ffffff;
  font-weight: 500;
}

/* 主页面作业卡片标题行右侧图标颜色设置为白色 */
.student-homework-card-header .action-icons i {
  color: white;
  opacity: 0.9;
  transition: color 0.2s ease, transform 0.2s ease;
}

.student-homework-card-header .action-icons i:hover {
  color: #ffffff;
  text-shadow: 0 0 6px rgba(255,255,255,0.3);
  transform: scale(1.2);
}

/* 暗色模式下大屏截图按钮颜色设置为白色 */
#largeScreenModalBody.dark-mode .large-screen-screenshot-icon {
  color: #ffffff;
  opacity: 0.9;
}

#largeScreenModalBody.dark-mode .large-screen-screenshot-icon:hover {
  color: #ffffff;
  text-shadow: 0 0 6px rgba(255,255,255,0.3);
  transform: scale(1.2);
}

/* 浅色模式下：加深大屏作业卡片标题行背景色 */
.large-screen-card-header {
  background-color: #cce4f9; /* 更饱和的浅蓝色 */
  color: var(--font-color);
}

/* 主页面：移除每条作业任务项背景色 */
.homework-item {
  background: none !important;
  border-bottom: 1px solid #f0f0f0;
  padding: 0.5rem 0.75rem;
  border-radius: 0;
}

/* 大屏模组：移除每条作业任务项背景色 */
.large-screen-homework-item {
  background: none !important;
  padding: 0.3rem 0.75rem;
  border-radius: 0;
}

/* 暗色模式下也保持无背景 */
#largeScreenModalBody.dark-mode .large-screen-homework-item {
  background: none !important;
}

.large-screen-card:hover,
#largeScreenModalBody.dark-mode .large-screen-card:hover {
  background-color: transparent !important;
  border-color: inherit !important;
  box-shadow: inherit !important;
  transform: none !important;
}

/* 大屏学生作业卡片悬浮时边框透明（暗色模式） */
#largeScreenModalBody.dark-mode .large-screen-card:hover {
  border-color: transparent !important;
}

/* 左侧登记面板：作为弹性列容器，禁用自身滚动 */
#homeworkRegistrationPanel {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden; /* 防止外层再滚动 */
  gap: 0.5rem;      /* 步骤之间微距 */
}

/* 内部滚动容器：仅从 “3.输入作业任务” 开始的内容滚动 */
#registrationScrollContainer {
  flex: 1 1 auto;
  min-height: 0;        /* 让 flex 子项正确计算高度 */
  overflow-y: auto;     /* 启用垂直滚动 */
  padding-right: 10px;  /* 与全局滚动条样式一致 */
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* 保持按钮靠底部且不被遮挡（随滚动区域一起滚） */
#registrationScrollContainer #registerHomeworkBtn {
  margin-top: auto;
}

/* 顶部两步在滚动时保持清晰的视觉分隔 */
#homeworkRegistrationPanel .form-label {
  margin-bottom: 0.35rem;
}

.student-panel {
  height: 100%;
  overflow: hidden;
}

.student-filter-bar {
  padding: 1rem 1.25rem 0 1.25rem;
  background-color: var(--card-header-bg);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  z-index: 2;
}

.student-table-wrapper {
  flex-grow: 1;
  overflow-y: auto;
  padding: 0 1.25rem 1.25rem 1.25rem;
}

.student-table-wrapper table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.student-table-wrapper thead.sticky-top {
  position: sticky;
  top: 0;
  z-index: 1;
  background-color: var(--panel-bg-color);
}

/* 让模态内容成为纵向布局，便于固定头尾 */
#bulkInputModal .modal-content {
  display: flex;
  flex-direction: column;
  max-height: 80vh;          /* 总高度上限 */
}

/* 仅主体滚动，头尾固定 */
#bulkInputModal .bulk-scroll-body {
  overflow-y: auto;
  padding: 0 1rem 1rem 1rem; /* 与Bootstrap间距一致 */
}

/* 预览区域最小高度并允许内部滚动（多内容时更友好） */
/*#bulkInputModal .bulk-preview-box {
  min-height: 80px;
  max-height: 40vh;
  overflow-y: auto;
  background: #fafafa;
}

/* 左右两栏容器：并排布局 + 间距 */
#bulkInputModal .bulk-two-col {
  display: flex;
  gap: 1rem;
  align-items: stretch;
}

/* 每一栏统一高度与滚动行为 */
#bulkInputModal .bulk-pane {
  flex: 1 1 0;
  min-height: 40vh;     /* 两栏的基础高度 */
  max-height: 52vh;     /* 防止过高，留出底部按钮空间 */
  overflow-y: auto;     /* 超出垂直滚动 */
  background: #fafafa;
  border-radius: 6px;
  padding: 0.75rem;
}

/* 让左侧 textarea 充满容器高度，内部滚动 */
#bulkInputModal .bulk-pane textarea#bulkInputTextarea {
  min-height: 36vh;     /* 与右侧预览接近 */
  height: 100%;         /* 自适应填满容器 */
  overflow-y: auto;
}

/* 标签与内边距微调，避免文字贴边 */
#bulkInputModal .bulk-pane .form-label {
  margin-bottom: 0.5rem;
}

#bulkInputModal .bulk-pane #bulkInputPreview {
  min-height: 36vh;
  overflow-y: auto;
  background: #fff;
}

/* 头部“目标科目”块与主体的间距协调 */
#bulkInputModal .modal-header {
  flex-shrink: 0;
}
#bulkInputModal .modal-footer {
  flex-shrink: 0;
}

/* OCR modal layout follows bulk modal conventions */
#ocrInputModal .modal-content {
  display: flex;
  flex-direction: column;
  max-height: 80vh;
}
#ocrInputModal .modal-header { flex-shrink: 0; }
#ocrInputModal .modal-footer { flex-shrink: 0; }
#ocrInputModal .ocr-scroll-body {
  overflow-y: auto;
  padding: 0 1rem 1rem 1rem;
}
#ocrInputModal .ocr-two-col {
  display: flex;
  gap: 1rem;
  align-items: stretch;
}
#ocrInputModal .ocr-pane {
  flex: 1 1 0;
  min-height: 40vh;
  max-height: 52vh;
  overflow-y: auto;
  background: #fafafa;
  border-radius: 6px;
  padding: 0.75rem;
}

/* 左右区域对齐：右侧预览与左侧 textarea 同高 */
#ocrInputModal .ocr-pane {
  display: flex;
  flex-direction: column;
}

#ocrInputModal .ocr-pane .form-label { margin-bottom: 0.5rem; }
#ocrInputModal .ocr-input-dropzone {
  position: relative;
  border: 2px dashed var(--border-color);
  border-radius: 6px;
  padding: 0.75rem;
  background: #fff;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden; /* 防止内容溢出 */
}
#ocrInputModal .ocr-input-dropzone.dragover {
  border-color: var(--primary-color);
  background: rgba(0, 103, 198, 0.06);
}
#ocrInputModal .ocr-image-preview {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain; /* 保持比例缩放 */
  border-radius: 4px;
  display: block;
}
#ocrInputModal .ocr-textarea {
  margin-top: 0.5rem;
  min-height: 210px;  /* 原来约140px，增加50% */
  resize: vertical;
}
#ocrInputModal .ocr-preview-box {
  min-height: 36vh;
  overflow-y: auto;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem;
}

#ocrInputModal .ocr-preview-box {
  flex-grow: 1;
  min-height: 210px; /* 与左侧 textarea 对齐 */
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

/* Bright progress pill shown during OCR */
#ocrInputModal .ocr-progress-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 16px;
  font-weight: 600;
  font-size: 0.85rem;
  background: var(--status-yellow);
  color: #1e1e1e;
  box-shadow: var(--shadow-sm);
}
#ocrInputModal .ocr-progress-pill .spinner {
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,0.6);
  border-top-color: #1e1e1e;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#ocrInputModal .ocr-progress-pill.done {
  background: var(--status-green);
  color: #fff;
}
#ocrInputModal .ocr-progress-pill.error {
  background: var(--status-red);
  color: #fff;
}

/* === 打印优化：放大作业任务字体 === */
 @media print {
  .student-homework-card .table td,
  .student-homework-card .table th {
    font-size: 1.1rem;   /* 字体放大 */
    line-height: 1.6;    /* 行距更舒适 */
  }
}

/*
 * === 模态框左右布局修复 (V3 - 最终版) ===
 *
 * 1. bulkInputModal: 左右两侧均保持固定的 36vh 高度。
 * 2. ocrInputModal: 左侧 textarea 保持固定 210px 高度，
 * 右侧 preview 自动伸展 (flex-grow: 1) 以填满空白，消除不平衡感。
 */

/* * 1. Bulk Input Modal (整段输入)
 * (保持固定高度)
 */
#bulkInputModal .bulk-pane textarea#bulkInputTextarea {
  height: 36vh;
  min-height: 36vh;
  max-height: 36vh;
  overflow-y: auto;
  resize: none;
}
#bulkInputModal .bulk-pane #bulkInputPreview {
  height: 36vh;
  min-height: 36vh;
  max-height: 36vh;
  overflow-y: auto;
  background: #fff;
  flex-grow: 0; 
}

/* * 2. OCR Input Modal (图片识别)
 * (左侧固定，右侧按左侧总高度固定)
 */

 /* 2.0. (新增修复) 左侧 Dropzone: 保持固定 220px 高度，不伸展 */
#ocrInputModal .ocr-input-dropzone {
  height: 220px;
  min-height: 220px; /* 保持一致 */
  max-height: 220px; /* 保持一致 */
  flex-grow: 0;      /* 禁止伸展 */
}

/* 2.1. 左侧 textarea: 保持固定 210px 高度，不伸展 */
#ocrInputModal .ocr-textarea {
  height: 210px;
  min-height: 210px;
  max-height: 210px;
  overflow-y: auto;
  resize: none;
  flex-grow: 0; /* 禁止伸展 */
}

/* 2.2. 右侧 preview: 高度固定为与左侧内容总高度一致，不伸展 */
#ocrInputModal .ocr-preview-box {
  /* * 计算左侧内容总高度: 
   * 220px (Dropzone min-height) + 0.5rem (Textarea margin-top) + 210px (Textarea min-height)
   */
  height: calc(220px + 0.5rem + 210px);
  min-height: calc(220px + 0.5rem + 210px); /* 保持一致 */
  max-height: calc(220px + 0.5rem + 210px); /* 保持一致 */
  
  overflow-y: auto;  /* 启用滚动 */
  flex-grow: 0;      /* 禁止伸展 */
}

/* === (新) 合约状态高亮样式 === */
        #contractTableBody .status-cell span {
            padding: 0.2em 0.6em;
            border-radius: 4px;
            font-weight: 500;
            font-size: 0.8rem;
        }

        #contractTableBody .status-valid {
            /* 生效中 (默认) */
            color: #2e7d32; 
            background-color: var(--status-green-bg);
        }
        #contractTableBody .status-warning {
            /* 即将过期 (黄色) */
            color: #f57f17;
            background-color: var(--status-yellow-bg);
        }
        #contractTableBody .status-expired {
             /* 已过期 (红色) */
            color: #c62828;
            background-color: var(--status-red-bg);
        }
        #contractTableBody .status-archived {
            /* 已续约 / 已终止 (灰色) */
            color: #4a5568;
            background-color: var(--status-gray-bg);
        }
        #contractTableBody .status-renewed {
    /* 已续约 (淡蓝色) */
    color: #1565c0;
    background-color: var(--status-blue-bg);
}
#contractTableBody .status-terminated {
    /* 已终止 (淡红色) */
    color: #b71c1c;
    background-color: var(--status-light-red-bg);
}

/* 看板卡片 */
.dash-card {
  background-color: var(--panel-bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}
.dash-card:hover { box-shadow: var(--shadow-md); }

.dash-card-header {
  display: flex; align-items: center; gap: .5rem;
  padding: .5rem .75rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--card-header-bg);
}
.dash-card-header.danger { color: #c62828; }
.dash-card-header.warning { color: #f57f17; }
.dash-card-header i { font-size: 1rem; color: inherit; }

.dash-card-body { padding: .75rem .9rem; }

.dash-kpi {
  font-size: 2rem; font-weight: 700; color: var(--primary-color);
  line-height: 1.2;
}
.dash-sub { font-size: .85rem; color: var(--secondary-color); }

.dash-list .dash-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: .25rem 0;
  border-bottom: 1px dashed var(--border-color);
}
.dash-list .dash-item:last-child { border-bottom: none; }
.dash-list .label { font-weight: 500; color: var(--font-color); }
.dash-list .value { color: var(--secondary-color); }

.dash-table-wrapper { max-height: 40vh; overflow: auto; }

/* 暗色模式适配（如果未来需要） */
#dashboardModalBody.dark-mode .dash-card {
  background-color: #2b2b2b; border-color: #444;
}
#dashboardModalBody.dark-mode .dash-card-header {
  background-color: #333; color: #d4ed31; border-bottom-color: #444;
}

/* dashboardModule中过期与即将到期列表 表格容器：限制高度并允许滚动 */
.dash-table-wrapper {
  max-height: 40vh;   /* 最大高度占视口 40% */
  overflow-y: auto;   /* 垂直滚动 */
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

/* 已过期表头：红色背景，黑色加粗字体，sticky */
.dash-expired-thead {
  background-color: var(--status-red-bg);
  position: sticky;
  top: 0;
  z-index: 2;
}
.dash-expired-thead th {
  color: #000000;
  font-weight: 700;
}

/* 即将到期表头：黄色背景，黑色加粗字体，sticky */
.dash-expiring-thead {
  background-color: var(--status-yellow-bg);
  position: sticky;
  top: 0;
  z-index: 2;
}
.dash-expiring-thead th {
  color: #000000;
  font-weight: 700;
}


/* 服务类型图标（单选） */
.service-type-icon {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 0.6rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  min-width: 86px;
  transition: all .2s ease;
  background: #fff;
}
.service-type-icon i {
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
  color: var(--secondary-color);
  transition: all .2s ease;
}
.service-type-icon span {
  font-size: 0.85rem;
}
.service-type-icon.selected, .service-type-icon:hover {
  border-color: var(--primary-color);
  background-color: var(--title-highlight-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.service-type-icon.selected i, .service-type-icon:hover i {
  color: var(--primary-color);
}




/* 如果使用了 .table-hover 的默认浅蓝，需要明确覆盖 */
.table.table-hover #contractTableBody tr:hover {
  background-color: #1864d657 !important;
}

/* 如果使用了 .table-striped 的偶数行背景，确保悬停时覆盖 */
.table.table-striped #contractTableBody tr:hover td,
.table.table-striped #contractTableBody tr:hover th {
  background-color: #a3daffd8 !important;
}


/* === 浮动姓名卡片样式（无标题） === */
.grade-region {
  position: relative; /* 确保浮动卡片定位基准 */
}

.floating-name-card {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  
  max-height: 25vh; /* 限制最大高度为视口高度的60% */
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(0, 103, 198, 0.25);
  padding: 0.5rem 0.75rem; /* 缩小内边距 */
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  font-size: 0.85rem;
  z-index: 2000; /* 保证在最上层 */
}

.floating-name-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.floating-name-card ul li {
  padding: 0.25rem 0;
  border-bottom: 1px dashed var(--border-color);
  color: var(--font-color);
  font-weight: 600; /* 加粗字体 */
  font-size: 0.8rem; /* 缩小字号 */
}
.floating-name-card ul li:last-child {
  border-bottom: none;
}

/* === 暗色模式下浮动卡片字体优化 === */
#largeScreenModalBody.dark-mode .floating-name-card ul li {
  color: #ffffff;           /* 纯白色，确保在深色背景下清晰可见 */
  font-weight: 600;         /* 加强加粗效果 */
  font-size: 0.8rem; /* 缩小字号 */
  text-shadow: 0 0 2px #000; /* 增加微弱阴影，提升可读性 */
}

/* === (新) 浮动姓名卡片指示器样式 === */

/* 调整 li 以便容纳指示器 */
.floating-name-card ul li {
  display: flex;
  align-items: center;
  gap: 6px; /* 姓名和指示器之间的间距 */
  font-weight: 600; /* (保持原有加粗) */
  font-size: 0.8rem; /* (保持原有字号) */
}

/* 指示器默认样式 (不可见时) */
.floating-name-card .indicator {
  display: inline-block;
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #6c757d; /* 默认：灰色 (暗) */
  opacity: 0.4;
  transition: background-color 0.3s ease, opacity 0.3s ease, box-shadow 0.3s ease;
}

/* 当卡片可见时，指示器高亮并闪烁 */
.floating-name-card .indicator.is-visible {
  background-color: #107c10; /* 绿色 */
  opacity: 1;
  box-shadow: 0 0 5px #107c10;
  animation: blink 1.2s infinite ease-in-out;
}

/* 暗色模式下的高亮 */
#largeScreenModalBody.dark-mode .floating-name-card .indicator.is-visible {
  background-color: #37ed31; /* 暗色模式高亮黄绿色 */
  box-shadow: 0 0 6px #d4ed31;
}

/* 暗色模式下字体 (保持原有) */
#largeScreenModalBody.dark-mode .floating-name-card ul li {
  color: #ffffff;
  text-shadow: 0 0 2px #000;
}

/* 闪烁动画 */
@keyframes blink {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(0.7);
    opacity: 0.6;
  }
}


/* --- 适用于 Chrome, Edge, Safari (Webkit/Blink 内核) --- */
.floating-name-card::-webkit-scrollbar {
    width: 0px; /* 滚动条变细 (往细) */
    /* 垂直滚动条的宽度 */
}

/* === (新) 优化下拉复选框 UI 风格 === */

/* 1. 容器：应用系统标准的圆角、边框和阴影 */
.dropdown-menu[aria-labelledby="filterStudentNameBtn"],
.dropdown-menu[aria-labelledby="filterCompletionStatusBtn"] {
  padding: 0; /* 移除 Bootstrap 默认 padding */
  border: 1px solid var(--border-color); /* */
  border-radius: 3px; /* 匹配系统圆角 */
  box-shadow: var(--shadow-md); /* 匹配系统阴影 */
  /* overflow: hidden; */ /* <--- 移除这一行 */

  /* (新) 自动适配视口高度 */
  max-height: 60vh;   /* <--- 设置最大高度为视口的60% */
  overflow-y: auto;   /* <--- 内容超出时自动显示垂直滚动条 */
}

/* 2. 头部：应用系统标题栏背景色 (var(--card-header-bg)) */
.dropdown-menu .dropdown-menu-header {
  position: sticky;
  top: 0;
  z-index: 10;
  /* (关键) 应用系统UI风格 */
  background-color: var(--card-header-bg); /* */
  color: var(--primary-color); /* */
  
  padding: 0.75rem 1rem; /* 增加内边距 */
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color); /* */
  font-size: 0.9rem;
  font-weight: 600; /* */
}

/* 3. 清空图标 (保持不变) */
#clearStudentFilterIcon {
  cursor: pointer;
  color: var(--secondary-color);
  font-size: 1rem;
}
#clearStudentFilterIcon:hover {
  color: var(--status-red);
  transform: scale(1.1);
}

/* 4. 列表容器：应用自定义滚动条并增加内边距 */
.dropdown-menu .dropdown-menu-list {
  max-height: 250px; 
  overflow-y: auto;
  padding: 0.25rem 0; /* 列表上下留白 */
}

/* 5. 列表项 (.form-check)：修复对齐和内边距 */
.dropdown-menu .form-check {
  /* (关键) 统一内边距，使其与 header 文本对齐 */
  padding: 0.25rem 1rem; 
  transition: background-color 0.2s ease;
  cursor: pointer;
}

/* 6. 列表项 hover 状态：应用系统高亮色 */
.dropdown-menu .form-check:hover {
    background-color: var(--title-highlight-bg); /* */
}

/* 7. 列表项文字 (保持不变) */
.dropdown-menu .form-check-label {
  font-size: 0.8rem;   
  font-weight: 500;  
  white-space: nowrap; /* (关键) 确保这里是 nowrap */
  cursor: pointer;
}

/* 8. (新) 应用自定义滚动条 (已修复) */
.dropdown-menu .dropdown-menu-list::-webkit-scrollbar,
#filterStudentNameContainer::-webkit-scrollbar {
    width: 4px; /* */
}
.dropdown-menu .dropdown-menu-list::-webkit-scrollbar-track,
#filterStudentNameContainer::-webkit-scrollbar-track {
    background: var(--panel-bg-color); /* (原为 transparent) */
}
.dropdown-menu .dropdown-menu-list::-webkit-scrollbar-thumb,
#filterStudentNameContainer::-webkit-scrollbar-thumb {
    background: var(--primary-color); /* */
    border-radius: 3px;
}
.dropdown-menu .dropdown-menu-list::-webkit-scrollbar-thumb:hover,
#filterStudentNameContainer::-webkit-scrollbar-thumb:hover {
    background: #ffb900; /* 匹配系统滚动条 hover */
}

/* === 修复：下拉筛选框UI问题 === */

/* 1. 解决错行问题：强制Flex布局 */
.dropdown-menu .dropdown-item-text {
    display: flex;
    align-items: flex-start; /* 顶部对齐，防止复选框跑到多行文本的中间 */
    padding: 0.35rem 1rem; /* 统一内边距 */
}

.dropdown-menu .dropdown-item-text .form-check-input {
    flex-shrink: 0; /* 防止复选框被压缩 */
    margin-top: 0.2em; /* 微调复选框垂直位置，使其与文本首行对齐 */
}
/* === (新) 修复：统一下拉筛选按钮与日期框的样式 === */
.btn-datepicker-style {
    /* 1. 匹配 form-control 的背景和字体 */
    background-color: var(--panel-bg-color);
    color: var(--font-color);
    
    /* 2. 匹配 form-control 的边框 */
    border: 1px solid var(--border-color);
    
    /* 3. 确保文字在按钮内部左对齐 (来自您之前的内联样式) */
    text-align: left !important; 
}

/* 4. 匹配 form-control 的 :focus 状态 (当悬停或下拉菜单打开时) */
.btn-datepicker-style:hover,
.btn-datepicker-style:active,
.btn-datepicker-style.show { /* .show 是 Bootstrap 在下拉菜单打开时添加的类 */
    background-color: var(--panel-bg-color);
    color: var(--font-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 103, 198, 0.2);
}

/* 5. 确保 Bootstrap 的 .dropdown-toggle 箭头颜色也正确 */
.btn-datepicker-style::after {
    color: var(--font-color);
}


/*
========================================
 PROGRESS MODULE - TABLE STYLING
========================================
*/

/* 1. 确保模态框内的表格正确布局 */
#progressModal .table-responsive {
    max-height: 90vh; /* 限制表格最大高度，超出则滚动 */
    overflow-y: auto;
}

#progressModal .table {
    width: 100%;
    margin-bottom: 0;
    border-collapse: collapse; /* 边框合并 */
    font-size: 0.9rem; /* 稍小的字体 */
}

/* 2. 表格头部 (th) 样式 */
#progressModal .table th {
    background-color: #343a40; /* Bootstrap 'bg-dark' 颜色 */
    color: #ffffff;
    border-color: #454d55;
    border: 1px solid #dee2e6;
    padding: 0.5rem 0.4rem;
    vertical-align: middle;
    text-align: center;
    font-weight: 600;
    /* 关键：让表头在垂直滚动时固定 */
    position: sticky;
    top: 0;
    z-index: 10; /* 确保在其他内容之上 */
}

/* 3. 表格单元格 (td) 样式 */
#progressModal .table td {
    border: 1px solid #dee2e6;
    padding: 0.4rem 0.4rem;
    vertical-align: middle;
    text-align: center;
    transition: background-color 0.15s ease-in-out; /* 为悬停添加过渡 */
}

/* 4. 定义状态单元格的背景色 */
/* (我们直接设置 <td> 的背景，而不是 span 的文字颜色) */
#progressModal .table .status-completed {
    background-color: #e6f7ec;
    color: #28a745;
    font-weight: 500;
}
#progressModal .table .status-partial {
    background-color: #fff8e1;
    color: #ffa000;
    font-weight: 500;
}
#progressModal .table .status-uncompleted {
    background-color: #fbe9e7;
    color: #d32f2f;
    font-weight: 500;
}
#progressModal .table .status-none {
    background-color: #f5f5f5;
    color: #757575;
}

/* 5. (核心) 鼠标悬停整行高亮 */
#progressModal #progressTableBody tr:hover {
    cursor: default; /* 明确鼠标样式，表示不可点击 */
}

/* 5a. 悬停时，普通单元格的背景 */
#progressModal #progressTableBody tr:hover td {
    background-color: #e7f7a3;
}

/* 5b. 悬停时，状态单元格也改变背景（变为稍暗的颜色）*/
#progressModal #progressTableBody tr:hover .status-completed {
    background-color: #d4f0df;
}
#progressModal #progressTableBody tr:hover .status-partial {
    background-color: #fbecd4;
}
#progressModal #progressTableBody tr:hover .status-uncompleted {
    background-color: #f8e1de;
}
#progressModal #progressTableBody tr:hover .status-none {
    background-color: #ebebeb;
}

/* === 合约重叠检测样式 === */
.overlap-group-card {
    border: 1px solid #f5c6cb;
    background-color: #fff;
    border-radius: 6px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.overlap-group-header {
    background-color: #fde8e8; /* 浅红色背景 */
    padding: 0.5rem 1rem;
    font-weight: 600;
    color: #333333;
    border-bottom: 1px solid #f5c6cb;
}

.overlap-group-body {
    padding: 0.75rem 1rem;
}

.overlap-item {
    padding: 0.5rem 0;
    border-bottom: 1px dashed #eee;
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.overlap-item:last-child {
    border-bottom: none;
}

/* 高亮重叠日期的样式 */
.date-highlight-conflict {
    color: #d83b01;
    font-weight: 700;
    background-color: #ffebee;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #ffcdd2;
}

/* === Header 用户信息显示优化 === */

/* 1. 垂直排列容器 */
.header-title-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    line-height: 1.1; /* 紧凑行高 */
}

/* 2. 主标题微调（确保不会太大影响布局） */
.platform-header h1 {
    font-size: 1.65rem; /* 稍微调小一点点以适应两行 */
    margin-bottom: 2px; /* 标题和用户名的间距 */
}

/* 3. 用户名小字样式 */
.current-user-text {
    font-size: 0.85rem;
    font-weight: 400;
    opacity: 0.85; /*稍微透明一点，突出主标题*/
    letter-spacing: 0.5px;
    color: rgba(255, 255, 255, 0.95);
}

/* =========================================
   1. 卡片微动效 (Micro-interactions)
   ========================================= */
/* 让卡片在悬停时轻微上浮并加深阴影，产生“物理质感” */
.student-homework-card, 
.dash-card, 
.subject-task-group {
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s ease;
}

.student-homework-card:hover, 
.dash-card:hover,
.subject-task-group:hover {
    transform: translateY(-4px); /* 上浮 4px */
    box-shadow: 0 12px 24px rgba(0, 103, 198, 0.15); /* 阴影扩散 */
}

/* =========================================
   2. Header 用户身份增强 (Avatar & Badge)
   ========================================= */
.user-identity-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 角色标签 (Badge) */
.user-role-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-left: 6px;
    vertical-align: middle;
}

.user-role-badge.admin {
    background-color: #ffd700; /* 金色 */
    color: #333;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.user-role-badge.teacher {
    background-color: rgba(255, 255, 255, 0.25);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.4);
}

/* === 全屏锁定遮罩层 === */
.screen-lock-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    /* z-index 必须极高，Bootstrap Modal 是 1055，Toast 是 1090，这里设为 9999 确保最顶层 */
    z-index: 9999; 
    background-color: rgba(0, 0, 0, 0.6); /* 半透明黑色背景 */
    backdrop-filter: blur(5px); /* 背景模糊效果，提升质感 */
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease;
}

/* 禁止页面在遮罩层下滚动 */
body.screen-locked {
    overflow: hidden !important;
}

/* 20251213 === 进度详情弹窗 (Progress Detail Popover) === */
.progress-detail-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5); /* 半透明黑色背景 */
    z-index: 2050; /* 比 Bootstrap Modal (1055) 高 */
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(2px);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.progress-detail-overlay.show {
    opacity: 1;
}

.progress-detail-card {
    background-color: var(--panel-bg-color);
    width: 90%;
    max-width: 600px; /* 限制最大宽度 */
    max-height: 80vh; /* 限制最大高度 */
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.progress-detail-overlay.show .progress-detail-card {
    transform: scale(1);
}

.progress-detail-header {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0; /* 防止头部被压缩 */
}

.progress-detail-header h5 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.progress-detail-body {
    padding: 1rem;
    overflow-y: auto; /* 内容过长自动滚动 */
}

/* 详情列表样式 */
.detail-group-title {
    font-weight: bold;
    color: var(--primary-color);
    margin-top: 0.75rem;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.25rem;
    font-size: 0.95rem;
}
.detail-group-title:first-child { margin-top: 0; }

.detail-date-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin: 0.5rem 0 0.25rem 0;
    padding-left: 0.5rem;
    border-left: 3px solid var(--border-color);
}

.detail-task-row {
    display: flex;
    align-items: flex-start; /* 顶部对齐 */
    padding: 0.5rem 0;
    border-bottom: 1px dashed #eee;
    gap: 0.75rem;
}

.detail-task-row:last-child { border-bottom: none; }

.detail-status-pill {
    flex-shrink: 0;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    width: 70px;
    text-align: center;
}

/* 状态颜色复用现有变量 */
.detail-status-pill.completed { background-color: var(--status-green-bg); color: #2e7d32; }
.detail-status-pill.partial { background-color: var(--status-yellow-bg); color: #f57f17; }
.detail-status-pill.uncompleted { background-color: var(--status-red-bg); color: #c62828; }

.detail-task-text {
    flex-grow: 1;
    font-size: 0.9rem;
    color: var(--font-color);
    line-height: 1.5;
    word-break: break-word;
}

/* 表格交互样式 */
.clickable-cell {
    cursor: pointer;
}
.clickable-cell:hover {
    filter: brightness(0.95); /* 微微变暗提示可点击 */
    box-shadow: inset 0 0 0 2px var(--primary-color); /* 内阴影高亮 */
}
.clickable-name {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: rgba(0, 103, 198, 0.3);
}
.clickable-name:hover {
    color: var(--primary-color-hover);
    text-decoration-color: var(--primary-color);
}