:root {
    --bg-main: #F1F5F9;
    --bg-panel: rgba(255, 255, 255, 0.8);
    --border-color: rgba(0, 0, 0, 0.1);
    --text-main: #0F172A;
    --text-sub: #475569;
    
    --color-lt: #2563EB;
    --color-th: #EA580C;
    --color-total: #334155;
    
    --success: #16A34A;
    --warning: #D97706;
    --error: #DC2626;
    --gtl-color: #E11D48;
    
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.glassmorphism {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 12px;
    gap: 12px;
}

/* HEADER */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
}

.header-left h1 {
    font-size: 1.2rem;
    font-weight: 700;
    display: inline-block;
    margin-right: 12px;
}

.status-indicator {
    font-size: 0.85rem;
    font-weight: 600;
}
.status-indicator.online { color: var(--success); }
.status-indicator.offline { color: var(--error); }

.header-center .date-display {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--warning);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.stats-box {
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-group {
    text-align: center;
}

.lt-stat .stat-value { color: #60A5FA; font-weight: 700; font-size: 1.1rem; }
.th-stat .stat-value { color: #FB923C; font-weight: 700; font-size: 1.1rem; }
.stat-label { font-size: 0.75rem; color: var(--text-sub); margin-top: 4px; }
.stat-divider { width: 1px; height: 30px; background: var(--border-color); }

.total-stats-box {
    display: flex;
    gap: 15px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.stat-item { text-align: center; }
.stat-num { font-size: 1.2rem; font-weight: 700; }
.text-yellow { color: var(--warning); }
.text-green { color: var(--success); }
.text-red { color: var(--error); }

.btn {
    border: none;
    cursor: pointer;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-icon {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover { background: rgba(0, 0, 0, 0.1); }

/* MAIN LAYOUT */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    flex: 1;
    overflow: hidden;
}

.col {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.col-header {
    text-align: center;
    padding: 12px;
    border-radius: 12px 12px 0 0;
}

.col-header h2 { font-size: 1.1rem; font-weight: 700; color: white; }

.bg-lt { background-color: var(--color-lt); color: white; }
.bg-th { background-color: var(--color-th); color: white; }
.bg-total { background-color: var(--color-total); color: white; }

/* OVERLAY & SIDEBAR */
.sidebar-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}
.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
}

.col-total {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    max-width: 90vw;
    height: 100vh;
    z-index: 1000;
    border-radius: 0;
    border-left: 1px solid var(--border-color);
    transition: right 0.3s ease;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: -4px 0 15px rgba(0,0,0,0.1);
}
.col-total.show {
    right: 0;
}

.col-tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-sub);
    padding: 14px 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.tab-btn.active {
    color: var(--color-lt);
    border-bottom: 2px solid var(--color-lt);
}

.tab-content {
    display: none;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.tab-content.active {
    display: flex;
}

.section-title {
    background: rgba(0, 0, 0, 0.03);
    padding: 6px 12px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-sub);
}

.card-container, .table-container {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}
.table-container { padding: 0; }
.flex-grow { flex: 1; overflow-y: auto; }
.mt-10 { margin-top: 10px; }

/* CARDS */
.student-card {
    position: relative;
    overflow: hidden;
    display: flex;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 12px;
    transition: transform 0.2s, background 0.2s, border-color 0.2s;
    user-select: none;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}
.student-card.th { } /* border-left is managed by hang classes now, or we can keep it? Let's just use background color for hang */

/* Classes for Hang */
.hang-b01 { background-color: #E0F2FE; border-color: #7DD3FC; }
.hang-b   { background-color: #DCFCE7; border-color: #86EFAC; }
.hang-c1  { background-color: #FEF9C3; border-color: #FDE047; }
.hang-c   { background-color: #FFEDD5; border-color: #FDBA74; }
.hang-d1  { background-color: #FCE7F3; border-color: #F9A8D4; }
.hang-d   { background-color: #F3E8FF; border-color: #D8B4FE; }
.hang-other { background-color: #F1F5F9; border-color: #CBD5E1; }

.hang-legend {
    display: flex;
    gap: 12px;
    padding: 10px;
    justify-content: center;
    flex-wrap: wrap;
    background: var(--glass-bg);
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
}
.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 1px solid rgba(0,0,0,0.1);
}

.upload-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: rgba(0,0,0,0.1);
    z-index: 10;
}
.progress-fill {
    width: 0%;
    height: 100%;
    background: var(--color-lt);
    animation: progressFill 1.5s linear forwards;
}
.student-card.th .progress-fill {
    background: var(--color-th);
}
@keyframes progressFill {
    from { width: 0%; }
    to { width: 100%; }
}

.student-card:hover {
    transform: translateY(-2px);
    background: #F8FAFC;
    cursor: pointer;
}

.processing-click {
    transform: scale(0.95) !important;
    opacity: 0.75 !important;
    pointer-events: none !important;
    transition: all 0.15s ease !important;
    background: #E2E8F0 !important;
}

.card-stt {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--text-sub);
    width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
}

.card-info { flex: 1; padding: 0 10px; }
.card-name { font-size: 1.2rem; font-weight: 700; margin-bottom: 4px; display: flex; align-items: center; }
.card-name.gtl { color: var(--gtl-color); }
.card-sub { font-size: 0.8rem; color: var(--text-sub); display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }

.badge-hang {
    font-size: 1.1rem;
    font-weight: 900;
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.6);
    padding: 1px 6px;
    border-radius: 4px;
    border: 1px solid rgba(0,0,0,0.15);
    margin: 0 4px;
}

.badge-new {
    background: #EF4444;
    color: white;
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 8px;
    animation: pulseBadge 1.5s infinite;
}

@keyframes pulseBadge {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
    100% { transform: scale(1); opacity: 1; }
}

.student-card.is-new {
    border-left-color: #EF4444;
    background: #FEF2F2;
}

.student-card.duplicate-warning {
    background-color: #FEF2F2;
    border-left-color: #EF4444;
    border-right: 2px solid #EF4444;
    border-top: 2px solid #EF4444;
    border-bottom: 2px solid #EF4444;
    box-shadow: 0 4px 6px -1px rgba(239, 68, 68, 0.2);
}
.student-card.duplicate-warning .card-name {
    color: #B91C1C;
}

tr.duplicate-warning {
    background-color: #FEF2F2 !important;
}
tr.duplicate-warning td {
    color: #B91C1C !important;
    font-weight: 600;
}

.card-status {
    text-align: right;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card-hang { font-weight: 700; font-size: 0.9rem; }
.card-time { font-size: 0.75rem; color: var(--text-sub); margin-top: 4px; }

/* TABLES */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background: #E2E8F0;
    color: var(--text-main);
    font-size: 0.8rem;
    padding: 12px 10px;
    text-align: left;
    position: sticky;
    top: 0;
    font-weight: 700;
    text-transform: uppercase;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    vertical-align: middle;
}

tr.status-done { background: rgba(22, 163, 74, 0.1); }
tr.status-done td { color: var(--success); }
tr.status-error { background: rgba(220, 38, 38, 0.1); }
tr.status-error td { color: var(--error); }
tr.status-k td { color: #9333EA; }

.selectable-table {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 0 1px var(--border-color);
    background: white;
}
.selectable-table th {
    background: #F8FAFC;
    color: #334155;
}
.selectable-table tr:last-child td {
    border-bottom: none;
}

.selectable-table tr:hover {
    background: rgba(0, 0, 0, 0.03);
    cursor: pointer;
}
.selectable-table tr.selected {
    background: rgba(37, 99, 235, 0.1);
}

/* PANEL & FORMS */
.panel-box {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    margin: 0 0 10px 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.panel-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-sub);
    margin-bottom: 6px;
}

.search-row { display: flex; gap: 6px; margin-bottom: 6px; }
input {
    flex: 1;
    background: white;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 6px 10px;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
}
input:focus { outline: none; border-color: var(--color-lt); }

.btn-primary { background: var(--color-lt); color: white; padding: 0 16px; }
.btn-primary:hover { background: #2563EB; }

.result-box {
    background: rgba(0, 0, 0, 0.03);
    padding: 8px;
    border-radius: 6px;
}

.res-name { font-weight: 700; margin-bottom: 2px; font-size: 0.95rem; color: var(--text-main) !important; }
.res-info { font-size: 0.75rem; color: var(--text-sub); margin-bottom: 4px; }
.res-status { font-size: 0.75rem; font-weight: 600; margin-bottom: 2px; display: inline-block; margin-right: 10px; }

.action-row {
    display: flex;
    gap: 8px;
    padding: 0;
}
.btn-add-lt { flex: 1; background: var(--color-lt); color: white; padding: 8px; font-size: 0.85rem; border: none; cursor: pointer; border-radius: 6px; font-weight: 600; transition: all 0.2s;}
.btn-add-lt:hover { background: #1D4ED8; }
.btn-add-th { flex: 1; background: var(--color-th); color: white; padding: 8px; font-size: 0.85rem; border: none; cursor: pointer; border-radius: 6px; font-weight: 600; transition: all 0.2s;}
.btn-add-th:hover { background: #C2410C; }

.input-full {
    width: calc(100% - 24px);
    margin: 0 12px;
}

/* SCROLLBAR */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.2); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, 0.3); }

/* TOASTS */
#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}
.toast {
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: 8px;
    color: var(--text-main);
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.toast.error { border-left: 4px solid var(--error); }
.toast.success { border-left: 4px solid var(--success); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }

/* TABLET & MOBILE RESPONSIVE OPTIMIZATION */
@media (max-width: 1024px) {
    .header {
        flex-wrap: wrap;
        gap: 15px;
    }
    .header-right {
        width: 100%;
        justify-content: flex-end;
        flex-wrap: wrap;
    }
}

@media (max-width: 850px) {
    body {
        overflow-y: auto;
    }
    .app-container {
        height: auto;
        overflow: visible;
    }
    .header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .header-right {
        justify-content: center;
        margin-top: 10px;
    }
    .main-content {
        display: flex;
        flex-direction: column;
        overflow: visible;
    }
    .col {
        height: 600px; /* Cố định chiều cao cột trên mobile/tablet để tự scroll */
        margin-bottom: 20px;
        flex: none;
    }
    .col-total {
        width: 100vw;
        right: -100vw;
        border-left: none;
    }
    .action-row {
        flex-wrap: wrap;
    }
}