:root {
    --bg-primary: #070b19;
    --bg-secondary: #0f172a;
    --bg-card: rgba(15, 23, 42, 0.85);
    --bg-glass: rgba(15, 23, 42, 0.7);
    --border-color: rgba(71, 85, 105, 0.3);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-cyan: #06b6d4;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-amber: #f59e0b;
    --accent-red: #ef4444;
    --sidebar-width: 220px;
    --glow-cyan: 0 0 20px rgba(6, 182, 212, 0.15);
    --glow-blue: 0 0 15px rgba(59, 130, 246, 0.2);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', 'Microsoft YaHei', 'PingFang SC', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: visible;
    letter-spacing: 0.01em;
}
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 60% at 20% 80%, rgba(6,182,212,0.04) 0%, transparent 60%),
        radial-gradient(ellipse 60% 80% at 80% 20%, rgba(139,92,246,0.04) 0%, transparent 60%),
        radial-gradient(ellipse 40% 50% at 50% 50%, rgba(59,130,246,0.02) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(rgba(71,85,105,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(71,85,105,0.06) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}
#app {
    display: flex;
    height: 100vh;
    overflow: hidden;
    position: relative;
    z-index: 1;
}
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #060b1f 0%, #0a0f2a 50%, #0d1237 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 100;
    border-right: 1px solid rgba(6,182,212,0.12);
    box-shadow: 4px 0 30px rgba(0,0,0,0.4);
}
.sidebar-header {
    padding: 24px 20px 20px;
    border-bottom: 1px solid rgba(6,182,212,0.12);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.sidebar-header::before {
    content: '';
    position: absolute;
    bottom: 0; left: 20%; right: 20%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(6,182,212,0.4), transparent);
}
.sidebar-header .logo-icon {
    display: inline-block;
    width: 42px; height: 42px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    border-radius: 12px;
    margin-bottom: 10px;
    line-height: 42px;
    font-size: 22px;
    box-shadow: var(--glow-cyan);
}
.sidebar-header .logo {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #06b6d4, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.sidebar-header .subtitle {
    font-size: 11px;
    color: rgba(148,163,184,0.5);
    margin-top: 4px;
    letter-spacing: 2px;
}
.sidebar-nav {
    flex: 1;
    padding: 10px 0;
    overflow-y: auto;
}
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(71,85,105,0.3); border-radius: 3px; }
.nav-item {
    display: flex;
    align-items: center;
    padding: 11px 18px;
    cursor: pointer;
    transition: all 0.25s ease;
    color: rgba(226,232,240,0.55);
    font-size: 13.5px;
    border-left: 2px solid transparent;
    gap: 10px;
    position: relative;
    margin: 2px 8px;
    border-radius: 0 8px 8px 0;
}
.nav-item:hover {
    background: rgba(6,182,212,0.06);
    color: var(--text-primary);
}
.nav-item.active {
    background: linear-gradient(90deg, rgba(6,182,212,0.12) 0%, rgba(59,130,246,0.06) 100%);
    color: #fff;
    border-left-color: var(--accent-cyan);
    font-weight: 600;
    box-shadow: var(--glow-blue);
}
.nav-item i { width: 18px; text-align: center; font-size: 14px; }
.nav-item .nav-badge {
    margin-left: auto;
    font-size: 10px;
    background: rgba(6,182,212,0.2);
    color: var(--accent-cyan);
    padding: 1px 6px;
    border-radius: 10px;
}
.sidebar-footer {
    padding: 14px 20px;
    border-top: 1px solid rgba(6,182,212,0.08);
    font-size: 11px;
    color: rgba(148,163,184,0.35);
    text-align: center;
    letter-spacing: 1px;
}
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: rgba(7,11,25,0.3);
}
.topbar {
    height: 56px;
    background: rgba(15,23,42,0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    flex-shrink: 0;
    z-index: 10;
}
.topbar .page-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}
.topbar .page-title i {
    color: var(--accent-cyan);
    margin-right: 8px;
}
.topbar .schedule-selector {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 10px;
}
.page-body {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
}
.page-body::-webkit-scrollbar { width: 5px; }
.page-body::-webkit-scrollbar-thumb { background: rgba(71,85,105,0.4); border-radius: 3px; }
.card-box {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
}
.card-box .card-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(71,85,105,0.2);
}
.card-box .card-title i { color: var(--accent-cyan); }
.toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}
.toolbar .spacer { flex: 1; }
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    color: var(--text-primary);
}
.data-table thead th {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(30,41,59,0.95);
    color: #94a3b8;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 10px 8px;
    border-bottom: 2px solid var(--border-color);
    text-align: left;
    white-space: nowrap;
}
.data-table thead th:first-child { text-align: center; }
.data-table tbody td {
    padding: 10px 8px;
    border-bottom: 1px solid rgba(71,85,105,0.15);
    vertical-align: middle;
}
.data-table tbody tr { transition: background 0.2s; }
.data-table tbody tr:hover { background: rgba(6,182,212,0.06); }
.data-table tbody tr.row-selected { background: rgba(6,182,212,0.1); }
.data-table tbody td:first-child { text-align: center; }
.data-table input[type="checkbox"] {
    width: 15px; height: 15px; cursor: pointer; accent-color: #06b6d4;
}
.combo-tag {
    display: inline-block; padding: 2px 8px; border-radius: 4px;
    font-size: 12px; font-weight: 500; color: #fff;
}
.combo-tag.combo- { background: #3b82f6; }
.combo-tag.combo-warning { background: #f59e0b; }
.combo-tag.combo-success { background: #10b981; }
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
}
.stat-card {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 16px;
    background: rgba(15,23,42,0.7);
    border: 1px solid rgba(71,85,105,0.25);
    border-radius: 10px;
    transition: border-color 0.25s;
}
.stat-card:hover { border-color: rgba(6,182,212,0.35); }
.stat-icon {
    width: 40px; height: 40px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 17px; flex-shrink: 0;
}
.stat-info { display: flex; flex-direction: column; gap: 2px; }
.stat-num { font-size: 20px; font-weight: 700; color: var(--text-primary); line-height: 1.2; }
.stat-label { font-size: 12px; color: var(--text-muted); }
.schedule-info {
    display: flex; align-items: center; gap: 8px;
    background: rgba(6,182,212,0.1); padding: 6px 14px;
    border-radius: 8px; font-size: 13px;
    color: var(--accent-cyan); border: 1px solid rgba(6,182,212,0.2);
}
.matrix-table {
    width: 100%; border-collapse: collapse; font-size: 13px;
}
.matrix-table th, .matrix-table td {
    border: 1px solid rgba(71,85,105,0.25); padding: 4px 6px;
    text-align: center; min-width: 100px;
}
.matrix-table th {
    background: rgba(15,23,42,0.95); font-weight: 600;
    color: var(--accent-cyan); white-space: nowrap;
    position: sticky; top: 0; z-index: 2;
}
.matrix-table th.class-col {
    background: rgba(6,182,212,0.08); color: var(--accent-cyan);
    position: sticky; left: 0; z-index: 3; min-width: 130px;
}
.matrix-table td.class-col {
    background: rgba(15,23,42,0.6); font-weight: 600;
    position: sticky; left: 0; z-index: 1;
    color: var(--text-primary); min-width: 130px;
}
.cell-match { background: rgba(16,185,129,0.1) !important; }
.cell-warning { background: rgba(245,158,11,0.1) !important; }
.cell-error { background: rgba(239,68,68,0.1) !important; }
.timetable-grid {
    display: grid;
    grid-template-columns: 70px 100px repeat(5, 1fr);
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}
.timetable-grid .tt-cell {
    background: rgba(15,23,42,0.8); padding: 8px 4px;
    text-align: center; font-size: 12px; min-height: 54px;
    display: flex; flex-direction: column; justify-content: center; gap: 2px;
}
.timetable-grid .tt-header {
    background: linear-gradient(135deg, rgba(6,182,212,0.2), rgba(59,130,246,0.15));
    color: var(--accent-cyan); font-weight: 700; font-size: 13px;
    text-shadow: 0 0 8px rgba(6,182,212,0.2);
}
.timetable-grid .tt-section {
    background: rgba(15,23,42,0.95); font-weight: 600; color: var(--text-secondary);
}
.timetable-grid .tt-time {
    background: rgba(15,23,42,0.95); color: var(--text-muted); font-size: 11px;
}
.tt-subject { font-weight: 700; color: var(--text-primary); }
.tt-teacher { color: var(--text-muted); font-size: 11px; }

/* ========== 拖拽交换样式 ========== */
.tt-cell[draggable="true"] {
    cursor: grab;
    transition: background 0.2s, transform 0.15s, box-shadow 0.15s;
}
.tt-cell[draggable="true"]:hover {
    background: rgba(6,182,212,0.08) !important;
}
.tt-cell.has-course[draggable="true"]:hover {
    background: rgba(6,182,212,0.15) !important;
}
.tt-cell.drag-source {
    opacity: 0.4 !important;
    background: rgba(6,182,212,0.2) !important;
    border: 2px dashed var(--accent-cyan) !important;
}
.tt-cell.drag-over {
    background: rgba(16,185,129,0.2) !important;
    border: 2px solid var(--accent-green) !important;
    box-shadow: 0 0 12px rgba(16,185,129,0.3) inset;
    transform: scale(1.03);
    z-index: 5;
    position: relative;
}
.tt-cell.drag-over-invalid {
    background: rgba(239,68,68,0.15) !important;
    border: 2px dashed var(--accent-red) !important;
}
.drag-hint {
    font-size: 10px;
    color: var(--text-muted);
    padding: 4px 8px;
    background: rgba(15,23,42,0.8);
    border-radius: 4px;
    margin-top: 6px;
    display: inline-block;
}

/* ========== 年级课表总览 ========== */
.grade-timetable-wrapper {
    overflow: auto;
    max-height: calc(100vh - 280px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}
.grade-tt-grid {
    display: grid;
    gap: 1px;
    background: var(--border-color);
    min-width: max-content;
}
.grade-tt-cell {
    background: rgba(15,23,42,0.8);
    padding: 5px 4px;
    text-align: center;
    font-size: 11px;
    min-height: 42px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1px;
    min-width: 95px;
    white-space: nowrap;
}
.grade-tt-cell.gt-header {
    background: linear-gradient(135deg, rgba(6,182,212,0.25), rgba(59,130,246,0.15));
    color: var(--accent-cyan);
    font-weight: 700;
    font-size: 12px;
    text-shadow: 0 0 8px rgba(6,182,212,0.2);
    position: sticky;
    top: 0;
    z-index: 2;
    min-height: 36px;
}
.grade-tt-cell.gt-time-label {
    background: rgba(15,23,42,0.95);
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 600;
    position: sticky;
    left: 0;
    z-index: 1;
    min-width: 60px;
}
.grade-tt-cell.gt-section-label {
    background: rgba(15,23,42,0.95);
    color: var(--text-secondary);
    font-size: 10px;
    font-weight: 600;
    position: sticky;
    left: 60px;
    z-index: 1;
    min-width: 70px;
}
.grade-tt-cell.gt-corner {
    background: linear-gradient(135deg, rgba(6,182,212,0.2), rgba(59,130,246,0.1));
    position: sticky;
    top: 0;
    left: 0;
    z-index: 3;
}
.grade-tt-cell.gt-class-header {
    background: linear-gradient(135deg, rgba(139,92,246,0.2), rgba(59,130,246,0.15));
    color: #c4b5fd;
    font-weight: 700;
    font-size: 11px;
    position: sticky;
    top: 0;
    z-index: 2;
}
.grade-tt-subject {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 11px;
}
.grade-tt-teacher {
    color: var(--text-muted);
    font-size: 9px;
}
.grade-tt-cell.gt-empty {
    background: rgba(15,23,42,0.4);
    color: rgba(100,116,139,0.3);
    font-size: 10px;
}
.grade-tt-cell.gt-break {
    background: rgba(15,23,42,0.6);
    color: var(--text-muted);
    font-size: 10px;
    font-style: italic;
}
/* 不同组合班级列头颜色 */
.grade-tt-cell.gt-physics {
    border-top: 2px solid var(--accent-cyan);
}
.grade-tt-cell.gt-history {
    border-top: 2px solid var(--accent-amber);
}

@media (max-width: 1024px) {
    .grade-tt-cell { min-width: 80px; font-size: 10px; }
    .grade-tt-subject { font-size: 10px; }
    .grade-tt-teacher { font-size: 8px; }
}
@media (max-width: 768px) {
    .grade-tt-cell { min-width: 65px; padding: 3px 2px; font-size: 9px; min-height: 34px; }
    .grade-tt-cell.gt-time-label { min-width: 40px; font-size: 8px; }
    .grade-tt-cell.gt-section-label { min-width: 50px; font-size: 8px; }
}
.data-table tr.course-zero-hour td {
    background: rgba(251, 191, 36, 0.06) !important; border-left: 3px solid #f59e0b !important;
}
.data-table tr.course-zero-hour:hover td { background: rgba(239, 68, 68, 0.15) !important; }
.preview-scroll { max-height: 350px; overflow: auto; }
/* 矩阵预览表 */
.matrix-preview-wrap {
    max-height: 380px; overflow: auto;
    border: 1px solid var(--border-color); border-radius: 8px;
    background: rgba(15,23,42,0.4);
}
.matrix-preview-table {
    width: max-content; min-width: 100%;
    border-collapse: collapse; font-size: 12px;
}
.matrix-preview-table thead {
    position: sticky; top: 0; z-index: 2;
}
.matrix-preview-table thead th {
    background: #1e3a5f; color: #93c5fd; font-weight: 600;
    padding: 8px 6px; text-align: center; border: 1px solid #334155;
    white-space: nowrap; min-width: 72px;
}
.matrix-preview-table thead th.mp-class-col {
    min-width: 90px; position: sticky; left: 0; z-index: 3;
    background: #1a3352;
}
.matrix-preview-table tbody td {
    padding: 6px; text-align: center; border: 1px solid #1e293b;
    white-space: nowrap; min-width: 72px; color: #cbd5e1;
}
.matrix-preview-table tbody td.mp-class-col {
    position: sticky; left: 0; z-index: 1; min-width: 90px;
    background: rgba(15,23,42,0.9); font-weight: 600;
}
.matrix-preview-table tbody td.mp-class-name {
    color: #e2e8f0; text-align: left; padding-left: 10px;
}
.matrix-preview-table tbody td.mp-filled {
    background: rgba(34,197,94,0.12); color: #86efac;
    font-weight: 500;
}
.matrix-preview-table tbody td.mp-empty {
    background: rgba(30,41,59,0.3); color: #475569;
}
.matrix-preview-table tbody tr:hover td {
    background: rgba(59,130,246,0.08);
}
.matrix-preview-table tbody tr:hover td.mp-class-col {
    background: rgba(30,41,59,0.95);
}
.matrix-preview-table tbody tr:hover td.mp-filled {
    background: rgba(34,197,94,0.2); color: #bbf7d0;
}
.import-stats {
    display: flex; gap: 20px; padding: 14px 18px;
    background: rgba(15,23,42,0.6); border-radius: 8px;
    margin-top: 12px; border: 1px solid var(--border-color);
}
.constraint-card {
    background: rgba(15,23,42,0.7); border: 1px solid var(--border-color);
    border-radius: 10px; padding: 14px; margin-bottom: 10px; transition: all 0.2s;
}
.constraint-card:hover { border-color: rgba(6,182,212,0.3); box-shadow: var(--glow-cyan); }
.constraint-card .constraint-header {
    display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.constraint-type-tag {
    padding: 2px 10px; border-radius: 6px; font-size: 11px;
    font-weight: 600; letter-spacing: 0.5px;
}
.ct-morning { background: rgba(245,158,11,0.2); color: var(--accent-amber); }
.ct-afternoon { background: rgba(139,92,246,0.2); color: var(--accent-purple); }
.ct-not_first { background: rgba(239,68,68,0.2); color: var(--accent-red); }
.ct-fixed { background: rgba(6,182,212,0.2); color: var(--accent-cyan); }
.ct-prefer { background: rgba(16,185,129,0.2); color: var(--accent-green); }
.ct-block { background: rgba(239,68,68,0.25); color: var(--accent-red); }
.ct-other { background: rgba(59,130,246,0.2); color: var(--accent-blue); }
.ct-custom { background: rgba(245,158,11,0.25); color: var(--accent-amber); border: 1px dashed rgba(245,158,11,0.4); }
.constraint-disabled { opacity: 0.5; }
.constraint-disabled:hover { opacity: 0.75; }
.drag-handle {
    cursor: grab; color: var(--text-muted); padding: 2px 4px;
    border-radius: 4px; transition: all 0.15s;
}
.drag-handle:hover { color: var(--accent-cyan); background: rgba(6,182,212,0.1); }
.drag-handle:active { cursor: grabbing; }
.custom-cond-badge {
    background: rgba(245,158,11,0.15); color: var(--accent-amber);
    padding: 1px 8px; border-radius: 4px; font-size: 11px;
}
.custom-cond-detail {
    margin-top: 8px; padding: 8px 12px;
    background: rgba(0,0,0,0.3); border-radius: 6px; border-left: 2px solid var(--accent-amber);
}
.custom-cond-detail code {
    color: var(--accent-cyan); font-size: 12px;
    font-family: 'Consolas','Courier New',monospace; word-break: break-all;
}
:root {
    --el-color-primary: #06b6d4;
    --el-color-primary-light-3: rgba(6,182,212,0.7);
    --el-color-primary-light-5: rgba(6,182,212,0.5);
    --el-color-success: #10b981;
    --el-color-warning: #f59e0b;
    --el-color-danger: #ef4444;
    --el-bg-color: #0f172a;
    --el-bg-color-overlay: #1e293b;
    --el-text-color-primary: #e2e8f0;
    --el-text-color-regular: #cbd5e1;
    --el-border-color: #334155;
    --el-fill-color-blank: #0f172a;
    --el-fill-color: #1e293b;
    --el-fill-color-light: #334155;
}
.el-dialog {
    background: #111827; border: 1px solid var(--border-color);
    border-radius: 14px; box-shadow: 0 20px 60px rgba(0,0,0,0.5), var(--glow-cyan);
}
.el-dialog__header { border-bottom: 1px solid rgba(71,85,105,0.2); padding: 16px 20px; }
.el-dialog__title { color: var(--text-primary); font-weight: 700; }
.el-dialog__body { padding: 20px; }
.el-input__wrapper, .el-textarea__inner {
    background: rgba(15,23,42,0.8) !important;
    border-color: rgba(71,85,105,0.3) !important;
    box-shadow: none !important;
    border-radius: 8px !important;
}
.el-input__inner, .el-textarea__inner { color: var(--text-primary) !important; }
.el-input__wrapper:hover { border-color: rgba(6,182,212,0.4) !important; }
.el-input.is-focus .el-input__wrapper {
    border-color: var(--accent-cyan) !important;
    box-shadow: 0 0 0 1px rgba(6,182,212,0.3) !important;
}
.el-select .el-input__wrapper { background: rgba(15,23,42,0.8) !important; }
.el-select-dropdown { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; }
.el-select-dropdown__item { color: var(--text-secondary) !important; }
.el-select-dropdown__item.hover, .el-select-dropdown__item:hover { background: rgba(6,182,212,0.15) !important; }
.el-select-dropdown__item.selected { color: var(--accent-cyan) !important; }
.el-popper.is-dark { background: #1e293b !important; }
.el-table {
    --el-table-bg-color: rgba(15,23,42,0.6);
    --el-table-tr-bg-color: rgba(15,23,42,0.6);
    --el-table-header-bg-color: rgba(15,23,42,0.9);
    --el-table-row-hover-bg-color: rgba(6,182,212,0.08);
    --el-table-row-striped-bg-color: rgba(15,23,42,0.45);
    --el-table-border-color: rgba(71,85,105,0.2);
    --el-table-text-color: #e2e8f0;
    --el-table-header-text-color: #06b6d4;
    color: #e2e8f0; border-radius: 8px; overflow: hidden;
}
.el-table th {
    background: rgba(15,23,42,0.9) !important; font-weight: 700;
    border-bottom: 1px solid rgba(6,182,212,0.15); color: var(--accent-cyan) !important;
}
.el-table td {
    background: rgba(15,23,42,0.6);
    border-bottom: 1px solid rgba(71,85,105,0.12); color: var(--text-primary) !important;
}
.el-table__header-wrapper { background: rgba(15,23,42,0.9) !important; }
.el-table__header { background: rgba(15,23,42,0.9) !important; }
.el-table__body-wrapper, .el-table__inner-wrapper { background: transparent !important; }
.el-table__body { background: transparent !important; }
.el-table__row--striped td { background: rgba(15,23,42,0.45) !important; }
.el-table .cell { color: var(--text-primary) !important; }
.el-table .el-button.is-link { color: var(--accent-cyan) !important; }
.el-table--border .el-table__cell { border-right: 1px solid rgba(71,85,105,0.2) !important; }
.el-loading-mask { background: rgba(7,11,25,0.7) !important; }
.el-loading-spinner .circular { color: var(--accent-cyan) !important; }
.el-pagination .btn-next, .el-pagination .btn-prev { background: rgba(15,23,42,0.8) !important; color: var(--text-secondary) !important; }
.el-pagination button { color: var(--text-secondary) !important; }
.el-pager li { color: var(--text-secondary) !important; background: transparent !important; }
.el-pager li.is-active { background: rgba(6,182,212,0.2) !important; color: var(--accent-cyan) !important; }
.el-radio__label { color: var(--text-secondary) !important; }
.el-radio-button__inner { background: rgba(15,23,42,0.8) !important; border-color: rgba(71,85,105,0.3) !important; color: var(--text-secondary) !important; }
.el-radio-button__orig-radio:checked + .el-radio-button__inner {
    background: rgba(6,182,212,0.2) !important; border-color: var(--accent-cyan) !important;
    color: var(--accent-cyan) !important; box-shadow: none !important;
}
.el-form-item__label { color: var(--text-secondary) !important; }
.el-checkbox__label { color: var(--text-secondary) !important; }
.el-step__title { color: var(--text-secondary) !important; }
.el-step__title.is-process { color: var(--accent-cyan) !important; }
.el-step__icon {
    background: rgba(15,23,42,0.8) !important; border-color: rgba(71,85,105,0.5) !important;
    color: var(--text-secondary) !important;
}
.el-step__icon.is-text { color: var(--text-primary) !important; }
.el-step__line { background-color: rgba(71,85,105,0.3) !important; }
.el-step__line-inner { border-color: var(--accent-cyan) !important; }
.el-switch__core { background: rgba(71,85,105,0.5) !important; border-color: rgba(71,85,105,0.5) !important; }
.el-switch.is-checked .el-switch__core { background: var(--accent-cyan) !important; border-color: var(--accent-cyan) !important; }
.el-slider__runway { background: rgba(71,85,105,0.3) !important; }
.el-slider__bar { background: var(--accent-cyan) !important; }
.el-slider__button { background: var(--accent-cyan) !important; border-color: var(--accent-cyan) !important; }
.el-upload-dragger { background: rgba(15,23,42,0.6) !important; border-color: rgba(71,85,105,0.3) !important; border-radius: 12px !important; }
.el-upload-dragger:hover { border-color: rgba(6,182,212,0.4) !important; }
.el-button { border-radius: 8px; font-weight: 500; letter-spacing: 0.3px; transition: all 0.2s; }
.el-button--default {
    background: rgba(30,41,59,0.9) !important; border: 1px solid rgba(71,85,105,0.4) !important;
    color: var(--text-secondary) !important;
}
.el-button--default:hover {
    background: rgba(51,65,85,0.9) !important; border-color: rgba(6,182,212,0.4) !important;
    color: var(--text-primary) !important;
}
.el-button--primary {
    background: linear-gradient(135deg, #06b6d4, #3b82f6) !important;
    border: none !important; box-shadow: 0 2px 12px rgba(6,182,212,0.2);
}
.el-button--primary:hover { box-shadow: 0 4px 20px rgba(6,182,212,0.35); }
.el-button--success { background: linear-gradient(135deg, #10b981, #059669) !important; border: none !important; }
.el-button--warning { background: linear-gradient(135deg, #f59e0b, #d97706) !important; border: none !important; }
.el-button--danger { background: linear-gradient(135deg, #ef4444, #dc2626) !important; border: none !important; }

/* 排课方案卡片 - 基础样式 */
.schedule-plan-card {
    background: rgba(30,41,59,0.5);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    transition: all 0.25s ease;
}
.schedule-plan-card:hover {
    background: rgba(30,41,59,0.75);
    border-color: rgba(100,116,139,0.5);
    box-shadow: 0 2px 12px rgba(0,0,0,0.25);
}

/* 第一行：方案标题 */
.plan-title {
    font-weight: 700;
    color: #e2e8f0;
    font-size: 15px;
    line-height: 1.4;
    word-break: break-all;
}

/* 第二行：方案信息 */
.plan-info {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
}

/* 第三行：操作按钮 */
.plan-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: center;
}

/* 排课方案卡片 - 当前选中 */
.schedule-plan-card.current-plan {
    background: rgba(59,130,246,0.1) !important;
    border: 1px solid rgba(59,130,246,0.5) !important;
    border-left: 3px solid #3b82f6 !important;
    box-shadow: 0 0 18px rgba(59,130,246,0.22), 0 2px 8px rgba(0,0,0,0.3);
    border-radius: 10px;
}
.schedule-plan-card.current-plan:hover {
    background: rgba(59,130,246,0.14) !important;
    border-color: rgba(59,130,246,0.65) !important;
    box-shadow: 0 0 22px rgba(59,130,246,0.3), 0 2px 8px rgba(0,0,0,0.3);
}

/* plain 按钮文字对比度增强 */
.el-button--primary.is-plain {
    background: rgba(59,130,246,0.15) !important;
    border: 1px solid rgba(59,130,246,0.35) !important;
    color: #93c5fd !important;
}
.el-button--primary.is-plain:hover {
    background: rgba(59,130,246,0.25) !important;
    color: #bfdbfe !important;
}
.el-button--danger.is-plain {
    background: rgba(239,68,68,0.12) !important;
    border: 1px solid rgba(239,68,68,0.3) !important;
    color: #fca5a5 !important;
}
.el-button--danger.is-plain:hover {
    background: rgba(239,68,68,0.2) !important;
    color: #fecaca !important;
}
.el-button--warning.is-plain {
    background: rgba(245,158,11,0.12) !important;
    border: 1px solid rgba(245,158,11,0.3) !important;
    color: #fcd34d !important;
}
.el-button--warning.is-plain:hover {
    background: rgba(245,158,11,0.2) !important;
    color: #fde68a !important;
}
.el-alert { border-radius: 8px; background: rgba(15,23,42,0.8) !important; border: 1px solid var(--border-color) !important; }
.el-tag { background: rgba(6,182,212,0.12) !important; border-color: rgba(6,182,212,0.25) !important; color: var(--accent-cyan) !important; border-radius: 6px !important; }
.el-tag--success { background: rgba(16,185,129,0.12) !important; border-color: rgba(16,185,129,0.25) !important; color: var(--accent-green) !important; }
.el-tag--warning { background: rgba(245,158,11,0.12) !important; border-color: rgba(245,158,11,0.25) !important; color: var(--accent-amber) !important; }
.el-tag--danger { background: rgba(239,68,68,0.12) !important; border-color: rgba(239,68,68,0.25) !important; color: var(--accent-red) !important; }
.el-tag--info { background: rgba(100,116,139,0.12) !important; border-color: rgba(100,116,139,0.25) !important; color: var(--text-secondary) !important; }
.el-message { background: #1e293b !important; border: 1px solid var(--border-color) !important; border-radius: 10px !important; }
.el-empty { background: transparent !important; }
.el-empty__description { color: var(--text-muted) !important; }
.el-empty svg { fill: rgba(100,116,139,0.3) !important; }
.el-empty__image { opacity: 0.3; }
.cell-select { width: 100%; min-width: 100px; }
.cell-select .el-input__wrapper { background: rgba(15,23,42,0.8) !important; }
.cell-select .el-input__inner { color: var(--text-primary) !important; }
.assign-cell-text {
    cursor: pointer; min-height: 28px; display: flex; align-items: center; justify-content: center;
    padding: 2px 4px; border-radius: 4px; transition: background 0.15s;
    font-size: 12px; font-weight: 500;
}
.assign-cell-text:hover { background: rgba(6,182,212,0.12); color: var(--accent-cyan); }
.assign-cell-empty { color: var(--text-muted); font-weight: 400; }
.el-dropdown-menu { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; }
.el-dropdown-menu__item { color: var(--text-secondary) !important; }
.el-dropdown-menu__item:hover, .el-dropdown-menu__item:focus { background: rgba(6,182,212,0.15) !important; color: var(--accent-cyan) !important; }
.el-dropdown-menu__item.is-disabled { color: var(--text-muted) !important; }
.el-dropdown__popper.el-popper { background: #1e293b !important; border-color: rgba(71,85,105,0.3) !important; }
.el-message-box { background: #111827 !important; border: 1px solid var(--border-color) !important; border-radius: 14px !important; }
.el-message-box__title { color: var(--text-primary) !important; }
.el-message-box__message { color: var(--text-secondary) !important; }
.el-message-box__btns { background: transparent !important; }
.el-message-box__header { border-bottom: 1px solid rgba(71,85,105,0.2) !important; }
.el-popper.is-dark, .el-tooltip__popper { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; color: var(--text-primary) !important; }
.el-popper.is-light { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; }
.el-popover { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; color: var(--text-primary) !important; }
.el-popover__title { color: var(--text-primary) !important; }
.el-select-dropdown__wrap { background: #1e293b !important; }
.el-select-dropdown__list { background: #1e293b !important; }

/* ====== 全局修复：el-select/el-dropdown 下拉菜单 ====== */
/* v25: PopperJS + scrollbar JS 动态锁死多层级高度，CSS + JS 双重防护 */
.el-select__popper,
.el-popper {
    z-index: 9999 !important;
}
/* 覆盖所有可能被 Element Plus scrollbar JS 写入的内联高度 */
/* 目标层级：el-popper -> el-select-dropdown -> el-select-dropdown__wrap -> el-scrollbar__wrap -> el-scrollbar__view */
.el-popper,
.el-select__popper,
.el-select-dropdown,
.el-select-dropdown .el-scrollbar__wrap,
.el-select-dropdown .el-scrollbar__view,
.el-select-dropdown .el-select-dropdown__wrap {
    height: auto !important;
    max-height: 340px !important;
}
.el-select-dropdown .el-scrollbar__wrap,
.el-select-dropdown .el-scrollbar__view {
    overflow-y: auto !important;
    overflow: auto !important;
}
/* 课程组合下拉面板：至少容纳8个选项（默认+7个组合） */
.course-combo-dropdown .el-popper,
.course-combo-dropdown .el-select__popper,
.course-combo-dropdown .el-select-dropdown {
    max-height: 340px !important;
}
.el-picker-panel { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; color: var(--text-secondary) !important; }
.el-picker-panel__sidebar { background: #1e293b !important; border-right: 1px solid rgba(71,85,105,0.3) !important; }
.el-picker-panel__shortcut { color: var(--text-secondary) !important; }
.el-picker-panel__shortcut:hover { color: var(--accent-cyan) !important; }
.el-date-picker__header-label { color: var(--text-primary) !important; }
.el-date-table th { color: var(--text-secondary) !important; }
.el-date-table td { color: var(--text-primary) !important; }
.el-date-table td.prev-month, .el-date-table td.next-month { color: var(--text-muted) !important; }
.el-picker-panel__footer { background: #1e293b !important; border-top: 1px solid rgba(71,85,105,0.3) !important; }
.el-date-picker__time-header { border-bottom: 1px solid rgba(71,85,105,0.3) !important; }
.el-time-panel { background: #1e293b !important; border: 1px solid rgba(71,85,105,0.3) !important; }
.el-time-spinner__item { color: var(--text-secondary) !important; }
.el-time-spinner__item:hover { color: var(--accent-cyan) !important; background: rgba(6,182,212,0.1) !important; }
.el-time-panel__footer { border-top: 1px solid rgba(71,85,105,0.3) !important; }
.el-input-number__decrease, .el-input-number__increase {
    background: rgba(30,41,59,0.8) !important; color: var(--text-secondary) !important;
    border-color: rgba(71,85,105,0.3) !important;
}
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(71,85,105,0.4); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(71,85,105,0.6); }

/* ========== 移动端响应式适配 ========== */
@media (max-width: 1024px) {
    :root { --sidebar-width: 180px; }
    .page-body { padding: 12px 10px; }
    .timetable-grid { grid-template-columns: 50px 65px repeat(5, 1fr); font-size: 10px; }
    .timetable-grid .tt-cell { padding: 4px 2px; min-height: 40px; font-size: 10px; }
    .tt-subject { font-size: 10px; }
    .tt-teacher { font-size: 9px; }
    .data-table { font-size: 11px; }
    .data-table thead th, .data-table tbody td { padding: 6px 4px; }
    .stats-row { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .stat-card { padding: 10px 12px; }
    .stat-num { font-size: 16px; }
    .toolbar { gap: 6px; }
    .topbar { padding: 0 12px; height: 48px; }
    .topbar .page-title { font-size: 14px; }
    .card-box { padding: 14px; }
}

@media (max-width: 768px) {
    :root { --sidebar-width: 56px; }
    .sidebar { width: 56px; }
    .sidebar-header { padding: 12px 6px; }
    .sidebar-header .logo-icon { width: 32px; height: 32px; font-size: 16px; line-height: 32px; }
    .sidebar-header .logo { font-size: 10px; }
    .sidebar-header .subtitle { display: none; }
    .nav-item { padding: 10px 8px; font-size: 0; justify-content: center; gap: 0; margin: 2px 4px; }
    .nav-item i { font-size: 16px; margin: 0; }
    .nav-item span, .nav-item .nav-badge { display: none; }
    .main-content { margin-left: 0; }
    .page-body { padding: 8px 6px; }
    .topbar { padding: 0 8px; height: 44px; gap: 6px; }
    .topbar .page-title { font-size: 12px; }
    .topbar .schedule-selector { gap: 4px; }
    .topbar .schedule-selector .el-select { width: 120px !important; }
    .topbar .schedule-info { padding: 2px 6px; font-size: 10px; }
    .card-box { padding: 10px; margin-bottom: 8px; border-radius: 8px; }
    .card-box .card-title { font-size: 13px; margin-bottom: 10px; }
    .timetable-grid { grid-template-columns: 36px 48px repeat(5, 1fr); font-size: 9px; }
    .timetable-grid .tt-cell { padding: 3px 1px; min-height: 32px; font-size: 9px; }
    .timetable-grid .tt-header { font-size: 10px; }
    .tt-subject { font-size: 9px; }
    .tt-teacher { font-size: 8px; }
    .stats-row { grid-template-columns: 1fr 1fr; gap: 6px; }
    .stat-card { padding: 8px 10px; gap: 8px; }
    .stat-icon { width: 32px; height: 32px; font-size: 14px; border-radius: 8px; }
    .stat-num { font-size: 14px; }
    .stat-label { font-size: 10px; }
    .data-table { font-size: 10px; }
    .data-table thead th, .data-table tbody td { padding: 4px 3px; font-size: 10px; }
    .toolbar { gap: 4px; }
    .toolbar .el-button { font-size: 11px; padding: 5px 8px; }
    .matrix-table { font-size: 10px; }
    .matrix-table th, .matrix-table td { padding: 2px 3px; min-width: 60px; }
    .matrix-table th.class-col, .matrix-table td.class-col { min-width: 80px; }
    .import-stats { flex-direction: column; gap: 8px; }
    .el-dialog { width: 95% !important; max-width: 95vw !important; }
    .el-form-item { margin-bottom: 10px; }
    .el-form-item__label { font-size: 12px; }
}

@media (max-width: 480px) {
    .stats-row { grid-template-columns: 1fr; }
    .timetable-grid { grid-template-columns: 30px 40px repeat(5, 1fr); }
    .timetable-grid .tt-cell { min-height: 28px; font-size: 8px; padding: 2px 0; }
    .data-table thead th { font-size: 9px; }
    .data-table tbody td { font-size: 9px; padding: 3px 2px; }
    .card-box { padding: 8px; }
    .toolbar { flex-wrap: wrap; }
    .el-button--default { font-size: 10px; padding: 4px 6px; }
    .schedule-selector { flex-wrap: wrap; }
    .constraint-card { padding: 8px; }
    .constraint-header { gap: 4px; flex-wrap: wrap; }
}

/* ========== 排课流程指南 ========== */
.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    background: rgba(15,23,42,0.6);
    border: 1px solid rgba(71,85,105,0.2);
    border-radius: 10px;
    transition: all 0.25s;
}
.flow-step:hover {
    border-color: rgba(6,182,212,0.35);
    background: rgba(6,182,212,0.04);
    box-shadow: 0 2px 12px rgba(6,182,212,0.08);
}
.flow-step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 0 12px rgba(6,182,212,0.25);
}
.flow-step-content {
    flex: 1;
    min-width: 0;
}
.flow-step-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 3px;
}
.flow-step-desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ========== 功能介绍卡片 ========== */
.feature-card {
    padding: 14px;
    background: rgba(15,23,42,0.5);
    border: 1px solid rgba(71,85,105,0.15);
    border-radius: 10px;
    transition: all 0.25s;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.feature-card:hover {
    border-color: rgba(6,182,212,0.3);
    background: rgba(6,182,212,0.03);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.feature-icon {
    font-size: 22px;
    margin-bottom: 2px;
}
.feature-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}
.feature-desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* 移动端 sidebar 可折叠 */
.sidebar-toggle { display: none; }
@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        top: 8px;
        left: 8px;
        z-index: 200;
        width: 36px;
        height: 36px;
        background: rgba(15,23,42,0.9);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        color: var(--accent-cyan);
        cursor: pointer;
        font-size: 18px;
    }
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 150;
    }
    .sidebar.open { transform: translateX(0); }
    .main-content { width: 100%; }
}