/* =========================================
   1. VARIABLES & RESET
   ========================================= */
:root {
    --font-sans: 'Roboto', 'Segoe UI', Arial, sans-serif;
    --font-mono: 'Roboto Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
    --font-size-body: 14px;
    --font-size-control: 14px;
    --font-size-table: 13px;
    --font-size-caption: 12px;
    --primary: #1b6ec2;
    --primary-dark: #10559b;
    --header-blue: #0091ff;
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --c-red: #ef4444;
    --c-orange: #f97316;
    --c-yellow: #eab308;
    --c-green: #10b981;
    --c-blue: #1b6ec2;
    --c-purple: #a855f7;
    --grad-blue: linear-gradient(135deg, #1b6ec2 0%, #1b81e8 100%);
    --grad-orange: linear-gradient(135deg, #c2554d 0%, #ef756b 100%);
    --grad-green: linear-gradient(135deg, #34d399 0%, #059669 100%) --grad-purple: linear-gradient(135deg, #823faf 0%, #a740b7 100%);
    --grad-red: linear-gradient(135deg, #ef4444 0%, #f43f5e 100%);
}

* {
    box-sizing: border-box;
}

html, body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    font-size: var(--font-size-body);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#app {
    height: 100%;
    width: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
}

/* =========================================
   2. SHARED UTILITIES
   ========================================= */
.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.hidden {
    display: none;
}

.w-full {
    width: 100%;
}

.cursor-pointer {
    cursor: pointer !important;
}

.material-icons-round {
    user-select: none;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/*TOP NAVBAR*/
.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* =========================================
   3. COMPONENTS
   ========================================= */

/* Standard Card */
.std-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 1.25rem;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
    transition: box-shadow 0.2s;
}

    .std-card:hover {
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.08);
    }

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}

.bar-indicator {
    width: 4px;
    height: 24px;
    border-radius: 99px;
}

/* Stat Card */
.stat-card {
    border-radius: 16px;
    padding: 1.5rem;
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.15), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    min-height: 120px;
    max-height: 150px;
    display: flex;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    flex: 0 0 auto;
}

    .stat-card:hover {
        transform: translateY(-8px) scale(1.02);
        box-shadow: 0 25px 30px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
        z-index: 10;
    }

.stat-icon-box {
    background: rgba(255, 255, 255, 0.25);
    width: 60px;
    height: 60px;
    border-radius: 16px;
    margin-right: 1.5rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: transform 0.4s ease;
}

.stat-card:hover .stat-icon-box {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.35);
}

.stat-icon-box .material-icons-round {
    font-size: 32px;
    color: white;
}

.stat-info {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0.95;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -1px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.blob-1, .blob-2 {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.05) 70%);
    filter: blur(8px);
    pointer-events: none;
    transition: all 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
    opacity: 0.7;
}

.blob-1 {
    width: 150px;
    height: 150px;
    top: -50px;
    right: -50px;
}

.blob-2 {
    width: 100px;
    height: 100px;
    bottom: -40px;
    right: 30px;
}

.stat-card:hover .blob-1 {
    transform: scale(1.3) translate(-20px, 20px);
    opacity: 0.9;
}

.stat-card:hover .blob-2 {
    transform: scale(1.5) translate(-30px, -20px);
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: 8px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 4px rgba(27, 110, 194, 0.3);
}

    .btn-primary:hover {
        background: var(--primary-dark);
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(27, 110, 194, 0.4);
    }

.btn-outline {
    background: white;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

    .btn-outline:hover {
        background: #f8fafc;
        border-color: #cbd5e1;
        color: var(--text-main);
    }

.btn-success {
    background: var(--c-green);
    color: white;
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.3);
}

.btn-icon {
    background: none;
    border: none;
    padding: 6px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    color: var(--text-muted);
    transition: all 0.2s;
}

    .btn-icon:hover {
        background: #f1f5f9;
        color: var(--primary);
        transform: scale(1.1);
    }

/* Forms */
.form-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 6px;
    display: block;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    outline: none;
    font-size: 0.9rem;
    background: white;
    transition: border 0.2s, box-shadow 0.2s;
}

    .form-input:focus {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px rgba(27, 110, 194, 0.15);
    }

.input-wrapper {
    position: relative;
    width: 100%;
}

.input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
    pointer-events: none;
    font-size: 20px;
    display: flex;
    align-items: center;
}

.input-has-icon {
    padding-left: 38px !important;
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
    border-radius: 0 0 12px 12px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

    .data-table th {
        background: #005b9f;
        color: #ffffff;
        font-weight: 700;
        text-transform: uppercase;
        padding: 14px 16px;
        text-align: center;
        border-bottom: 1px solid var(--border);
        font-size: 0.75rem;
        white-space: nowrap;
        vertical-align: middle;
        position: sticky;
        top: 0;
        z-index: 5;
    }

    .data-table td {
        padding: 12px 16px;
        border-bottom: 1px solid #f1f5f9;
        color: #334155;
        vertical-align: middle;
        white-space: nowrap;
        transition: background 0.1s;
    }

    .data-table tr:hover td {
        background-color: #f8fafc;
    }

/* Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.bg-green-light {
    background: #dcfce7;
    color: #166534;
}

.dot-green {
    background: #16a34a;
}

.bg-yellow-light {
    background: #fef9c3;
    color: #854d0e;
}

.dot-yellow {
    background: #eab308;
}

.bg-red-light {
    background: #fee2e2;
    color: #991b1b;
}

.dot-red {
    background: #dc2626;
}

.bg-purple-light {
    background: #f3e8ff;
    color: #6b21a8;
}

.dot-purple {
    background: #9333ea;
}

/* Status Badges for Attendance */
.att-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    transition: all 0.2s;
}

.status-present {
    background: #d1fae5;
    color: #065f46;
}

    .status-present:hover {
        background: #a7f3d0;
        transform: translateY(-1px);
    }

.status-late {
    background: #fef9c3;
    color: #854d0e;
}

    .status-late:hover {
        background: #fef3c7;
        transform: translateY(-1px);
    }

.status-absent {
    background: #fee2e2;
    color: #991b1b;
}

    .status-absent:hover {
        background: #fecaca;
        transform: translateY(-1px);
    }

.text-muted {
    color: var(--text-muted);
}

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

/* Modals */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: 0.2s ease;
    pointer-events: none;
}

    .modal-overlay.show {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    width: 400px;
    max-width: 90%;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
    transform: scale(0.9) translateY(20px);
    transition: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.show .modal-content {
    transform: scale(1) translateY(0);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 99px;
}

    ::-webkit-scrollbar-thumb:hover {
        background: #94a3b8;
    }

/* =========================================
   4. LAYOUT (Header & Nav)
   ========================================= */
.layout-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
    width: 100%;
    overflow: visible;
}

/* ── LAYOUT HEADER (2 rows) ── */
.layout-header {
    background: var(--primary);
    color: #fff;
    flex-shrink: 0;
    z-index: 9999;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

/* ── ROW 1: Top bar ── */
.header-inner {
    display: flex;
    align-items: center;
    padding: 0 10px;
    height: 44px;
    border-bottom: 1px solid rgba(255,255,255,0.12);
    gap: 6px;
}

/* Brand */
.brand-area {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.logo-box {
    width: 34px;
    height: 34px;
    background: #f8fafc;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

    .logo-box .logo-img {
        max-width: 34px;
        max-height: 34px;
        border-radius: 50%;
    }

.brand-name {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    margin: 0;
    letter-spacing: 0.3px;
    white-space: nowrap;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Header Left: module dropdown + context dropdowns + timer */
.header-left {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    min-width: 0;
    overflow: visible;
}

/* Static label "Quản lý giáo dục" */
.static-box {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.22);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    cursor: default;
    flex-shrink: 0;
}

/* Context dropdowns (cấp học, năm học, học kỳ) */
.level-box {
    position: relative;
    flex-shrink: 0;
}

.level-box-btn {
    display: flex;
    align-items: center;
    gap: 3px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.22);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s;
    color: #fff;
}

    .level-box-btn:hover {
        background: rgba(255,255,255,0.22);
    }

/* Dropdown menu for context selectors */
.dropdown-menu {
    display: block !important;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    min-width: 160px;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    z-index: 10000;
    padding: 4px 0;
}

.menu-item {
    padding: 7px 14px;
    font-size: 13px;
    color: #334155;
    cursor: pointer;
    transition: background 0.12s;
    white-space: nowrap;
}

    .menu-item:hover {
        background: #eff6ff;
        color: var(--primary);
    }

/* Session timer pill */
.session-timer {
    display: flex;
    align-items: center;
    gap: 3px;
    background: rgba(251,191,36,0.18);
    border: 1px solid rgba(251,191,36,0.4);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

/* User area (right side of top bar) */
.user-area {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
    margin-left: auto;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 5px;
    background: rgba(0,0,0,0.15);
    border-radius: 4px;
    padding: 3px 10px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
    white-space: nowrap;
}

    .user-info:hover {
        background: rgba(0,0,0,0.25);
    }

/* Icon action buttons in user area */
.header-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 4px;
    color: #fff;
    background: rgba(255,255,255,0.1);
    border: none;
    cursor: pointer;
    transition: background 0.15s;
    text-decoration: none;
}

    .header-icon-btn:hover {
        background: rgba(255,255,255,0.22);
        color: #fff;
    }

    .header-icon-btn .material-icons-round {
        font-size: 18px;
    }

/* ── ROW 2: Main navigation bar ── */
.main-nav-container {
    background: rgba(0,0,0,0.15);
    padding: 0 10px;
    height: 38px;
    position: relative;
    overflow-x: auto;
    overflow-y: visible;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.4) transparent;
}

    .main-nav-container::-webkit-scrollbar {
        height: 4px;
    }

    .main-nav-container::-webkit-scrollbar-track {
        background: transparent;
    }

    .main-nav-container::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.4);
        border-radius: 4px;
    }

    .main-nav-container::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 255, 255, 0.7);
    }

.main-nav {
    display: flex;
    align-items: center;
    height: 100%;
    gap: 0;
    min-width: max-content;
}

.nav-item-wrap {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 0 10px;
    height: 100%;
    color: rgba(255,255,255,0.88);
    font-size: 13px;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    text-decoration: none;
}

    .nav-link:hover,
    .nav-item-wrap:hover > .nav-link {
        background: rgba(255,255,255,0.15);
        color: #fff;
        border-bottom-color: rgba(255,255,255,0.5);
    }

    .nav-link.active {
        color: #fff;
        border-bottom-color: #fbbf24;
        font-weight: 700;
        background: rgba(255,255,255,0.15);
    }

.arrow-icon {
    opacity: 0.7;
    transition: transform 0.15s;
}

.nav-item-wrap:hover .arrow-icon {
    transform: rotate(180deg);
    opacity: 1;
}

/* Navigation Dropdown ─ hiển thị bằng @if trong Blazor, không dùng CSS hover */
.nav-dropdown {
    position: fixed;
    top: 82px;          /* sát dưới header (44px + 38px) */
    left: -9999px;      /* Vị trí mặc định ngoài màn hình tránh giật về góc trái trước khi JS tính toán */
    min-width: 220px;
    background: #fff;
    border-radius: 0 0 6px 6px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    padding: 4px 0;
    border: 1px solid #e2e8f0;
    border-top: 2px solid var(--primary);
    z-index: 10000;
    animation: navDropIn 0.14s ease;
}

@keyframes navDropIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

    .nav-dropdown.two-cols {
        min-width: 480px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        padding: 8px;
        gap: 2px;
    }

/* Arrow xoay khi mở */
.arrow-icon.open {
    transform: rotate(180deg) !important;
    opacity: 1;
}

/* Nav link đang mở dropdown */
.nav-link.is-open {
    background: rgba(255,255,255,0.2);
    color: #fff;
    border-bottom-color: #fbbf24;
}

/* Backdrop trong suốt để đóng dropdown khi click ra ngoài */
.nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 9990;
    background: transparent;
    cursor: default;
}

.dropdown-item {
    padding: 7px 14px;
    color: #334155;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    transition: background 0.1s, padding-left 0.1s;
    text-decoration: none;
    border-radius: 0;
}

    .dropdown-item:hover {
        background: #eff6ff;
        color: var(--primary);
        padding-left: 18px;
    }

    .dropdown-item.active {
        background: #eff6ff;
        color: var(--primary);
        font-weight: 600;
    }

.sub-icon {
    font-size: 16px;
    color: #94a3b8;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.dropdown-item:hover .sub-icon,
.dropdown-item.active .sub-icon {
    color: var(--primary);
}

/* Nav item index number badge */
.nav-index {
    font-size: 0.7rem;
    opacity: 0.65;
    margin-right: 1px;
    font-weight: 500;
    flex-shrink: 0;
}

/* Sub-item number badge (x.y) in dropdown */
.sub-num {
    font-size: 0.72rem;
    color: var(--primary);
    opacity: 0.7;
    font-weight: 600;
    min-width: 22px;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

.dropdown-item:hover .sub-num,
.dropdown-item.active .sub-num {
    opacity: 1;
}

/* Content Area */
.layout-body {
    flex: 1;
    min-height: 0;
    background: var(--bg-page);
    /* padding: 0.5rem; */
    overflow: clip; /* clip không tạo containing block cho position:fixed */
    display: flex;
    flex-direction: column;
}

.layout-content {
    width: 100%;
    margin: 0 auto;
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.layout-content.is-fluid {
    width: 100%;
    max-width: none;
}

.layout-content.is-fluid .layout-viewport {
    width: 100%;
}

.layout-viewport {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow-x: clip; /* clip thay vì hidden — không tạo containing block cho position:fixed */
    overflow-y: auto;
    /* position: relative đã bỏ — nguyên nhân giam modal position:fixed bên trong viewport */
}

/* Sub Tabs */
.sub-tabs-bar {
    background: white;
    padding: 4px;
    border-radius: 12px;
    display: flex;
    gap: 6px;
    margin-bottom: 0.5rem;
    border: 1px solid #e2e8f0;
    flex-shrink: 0;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.sub-tab-link {
    flex: 1;
    padding: 10px;
    text-align: center;
    border-radius: 8px;
    color: #64748b;
    font-weight: 500;
    font-size: 0.95rem;
    transition: 0.2s;
    text-decoration: none;
}

    .sub-tab-link:hover {
        background: #f8fafc;
        color: var(--primary);
    }

    .sub-tab-link.active {
        background: #eff6ff;
        color: var(--primary);
        font-weight: 700;
        border-bottom: 2px solid var(--primary);
    }

/* =========================================
   5. PAGE SPECIFIC
   ========================================= */

/* Home Dashboard */
.page-home-dashboard {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    padding-bottom: 0.5rem;
    overflow: hidden;
}

.home-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-shrink: 0;
}

    .home-header .home-title-area {
        display: flex;
        gap: 8px;
        align-items: center;
    }

.home-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-shrink: 0;
}

.home-main-grid {
    display: grid;
    grid-template-columns: 3.5fr 6.5fr;
    gap: 1.5rem;
    flex: 1;
    min-height: 0;
}

/* Add new 3-column grid for charts */
.home-charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.5rem;
    flex: 1;
    min-height: 0;
}

.home-chart-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Smaller list card styles */
.home-list-card-small {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.home-list-scroll-small {
    overflow-y: auto;
    flex: 1;
    padding-right: 6px;
}

.progress-row-small {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

    .progress-row-small:hover {
        background: #f8fafc;
    }

.grade-icon-small {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.7rem;
    flex-shrink: 0;
}

.p-content-small {
    flex: 1;
    min-width: 0;
}

.p-name-small {
    font-size: 0.9rem;
    font-weight: 600;
    color: #1e293b;
}

.p-val-small {
    font-size: 0.8rem;
    font-weight: 600;
    color: #64748b;
}

.p-bar-small {
    width: 100%;
    height: 6px;
    background: #e2e8f0;
    border-radius: 99px;
    margin-top: 6px;
    overflow: hidden;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.text-red {
    color: #ef4444;
}

.text-primary {
    color: var(--primary);
}

.cursor-default {
    cursor: default;
}

/* Add/Update the chart styles section */

.chart-wrapper {
    width: 180px;
    height: 180px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

canvas {
    max-width: 100%;
    display: block !important;
}

#studentAttendanceChart,
#teacherAttendanceChart {
    width: 180px !important;
    height: 180px !important;
    max-width: 100%;
    display: block !important;
}

.chart-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    line-height: 1;
    z-index: 10;
}

.c-main {
    font-size: 2.5rem;
    font-weight: 900;
    color: #1e293b;
}

.c-sub {
    font-size: 0.8rem;
    color: #64748b;
    text-transform: uppercase;
    font-weight: 600;
}

.text-green {
    color: #22c55e;
}

/* Replace the old chart-legend section with this new compact version */
.session-tabs {
    display: flex;
    background: #f1f5f9;
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
}

    .session-tabs span {
        font-size: 0.8rem;
        font-weight: 600;
        padding: 4px 12px;
        border-radius: 6px;
        cursor: pointer;
        color: #64748b;
        transition: all 0.2s;
    }

        .session-tabs span.active {
            background: white;
            color: var(--primary);
            box-shadow: 0 1px 2px rgba(0,0,0,0.1);
        }

        .session-tabs span:hover:not(.active) {
            background: #e2e8f0;
        }

.chart-legend-compact {
    display: flex;
    gap: 20px;
    margin-top: 1rem;
    width: 100%;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.legend-text {
    color: var(--text-main);
    font-weight: 500;
}

    .legend-text b {
        font-weight: 700;
        margin-left: 4px;
        color: var(--text-main);
    }

.chart-legend {
    display: none;
}

.l-item {
    display: none;
}

/* =========================================
   ADD THIS SECTION BACK - Home Chart Styles
   ========================================= */

.home-chart-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
}

/* =========================================
   ADD THIS SECTION BACK - Calendar Styles
   ========================================= */

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    text-align: center;
}

.cal-head {
    font-weight: 700;
    font-size: 0.85rem;
    color: #64748b;
    padding: 10px 0;
}

.cal-cell {
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    transition: 0.2s;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
}

    .cal-cell:hover {
        background: #f1f5f9;
        color: var(--primary);
    }

    .cal-cell.active {
        background: var(--primary);
        color: white;
        font-weight: bold;
        box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    }

/* =========================================
   ADD THIS SECTION BACK - Tea & Att Styles
   ========================================= */

/* Tea (Teacher) Styles */
.tea-icon {
    padding: 10px;
    background: #dbeafe;
    border-radius: 12px;
    color: #1e40af;
    display: flex;
}

.tea-filter-box,
.att-filter-box {
    flex-shrink: 0;
    height: auto !important;
    flex: 0 0 auto;
}

.tea-filters,
.att-filters-row {
    display: flex;
    gap: 1.5rem;
    align-items: flex-end;
}

.tea-f-wide,
.att-f-item-wide {
    flex: 2;
    min-width: 200px;
}

.tea-f-item,
.att-f-item {
    flex: 1;
    min-width: 140px;
}

.tea-table-box,
.att-table-box {
    padding: 0;
    overflow: hidden;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.tea-table-header,
.att-header-row {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.tea-scroll,
.att-table-content {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

.tea-footer,
.att-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f8fafc;
    flex-shrink: 0;
}

.att-badge {
    background: #f1f5f9;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.9rem;
    margin-left: 8px;
    font-weight: bold;
}

.att-legend, .tea-legend {
    display: flex;
    gap: 12px;
}

.att-paging {
    display: flex;
    gap: 6px;
}

.pg-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

/* =========================================
   ADD THIS SECTION BACK - Attendance Stats
   ========================================= */

.page-attendance-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: 100%;
    overflow-y: auto;
    padding-right: 4px;
}

.stats-summary-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.bg-blue {
    background: #eff6ff;
    color: #1e40af;
    border: 1px solid #dbeafe;
}

.bg-green {
    background: #f0fdf4;
    color: #15803d;
    border: 1px solid #dcfce7;
}

.bg-orange {
    background: #fff7ed;
    color: #9a3412;
    border: 1px solid #ffedd5;
}

.bg-red {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fee2e2;
}

/* =========================================
   ADD THIS SECTION BACK - Action Dropdown
   ========================================= */

.action-group {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    min-width: 200px;
    z-index: 50;
    display: flex;
    flex-direction: column;
    padding: 4px;
    animation: fadeIn 0.2s ease-out;
}
    .menu-item {
        padding: 10px 15px;
        border-bottom: 1px solid #f5f5f5;
        transition: 0.2s;
        white-space: nowrap;
    }

        .menu-item:hover {
            background: var(--hover-bg);
            color: var(--primary);
        }

.dropdown-item-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    font-size: 0.9rem;
    color: var(--text-main);
    border-radius: 4px;
    cursor: pointer;
}

    .dropdown-item-btn:hover {
        background: #f1f5f9;
        color: var(--primary);
    }

/* =========================================
   KEEP EXISTING - Responsive
   ========================================= */

@media (max-width: 1440px) {
    .home-charts-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 1024px) {
    .home-charts-grid {
        grid-template-columns: 1fr;
    }

    .stats-summary-row {
        grid-template-columns: 1fr 1fr;
    }

    .filter-container,
    .att-filters-row,
    .tea-filters {
        flex-direction: column;
        align-items: stretch;
    }
}

/* =========================================
   MOBILE RESPONSIVE NAVIGATION (REMASTERED)
   Style: App Drawer / Mega Menu Style
   ========================================= */

/* --- Trạng thái mặc định trên Desktop --- */
.menu-toggle-btn {
    display: none;
    background: transparent;
    border: none;
    color: white;
    padding: 8px;
    border-radius: 50%;
    margin-right: 12px;
    cursor: pointer;
}

    .menu-toggle-btn:hover {
        background: rgba(255,255,255,0.2);
    }

.mobile-wrapper {
    display: none;
}
/* Laptop: thu gọn vừa đủ trước khi chuyển sang drawer. */
@media (min-width: 1441px) and (max-width: 1600px) {
    .main-nav-container {
        padding-inline: 6px;
    }

    .nav-link {
        gap: 4px;
        padding-inline: 7px;
        font-size: 12px;
    }
}

/* --- Responsive Styles (Tablet & Mobile) ---
   Chỉ chuyển sang drawer menu ở <= 992px (Mobile & Tablet).
   Màn hình Laptop & Desktop (> 992px) hiển thị menu ngang cuộn ngang. */
@media (max-width: 992px) {
    /* Drawer phải nằm trên toàn bộ header khi mở. */
    .layout-header {
        z-index: 1000;
    }

    /* 1. Ẩn menu ngang cũ */
    .desktop-only {
        display: none !important;
    }

    /* 2. Hiện nút Hamburger */
    .menu-toggle-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* 3. Container Mobile Wrapper */
    .mobile-wrapper {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 2000;
        pointer-events: none;
    }

    .mobile-backdrop {
        position: absolute;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(4px);
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .mobile-drawer {
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
        width: 320px;
        max-width: 85vw;
        background: #ffffff;
        box-shadow: 4px 0 20px rgba(0,0,0,0.15);
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        display: flex;
        flex-direction: column;
        z-index: 2001;
    }

    /* --- TRẠNG THÁI MỞ (OPEN STATE) --- */
    .mobile-wrapper.open {
        pointer-events: auto;
    }

        .mobile-wrapper.open .mobile-backdrop {
            opacity: 1;
        }

        .mobile-wrapper.open .mobile-drawer {
            transform: translateX(0);
        }

    /* --- Nội dung bên trong Drawer --- */

    /* Header của Drawer */
    .drawer-header {
        padding: 16px 20px;
        border-bottom: 1px solid #f1f5f9;
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: var(--primary);
    }

    .drawer-logo {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .drawer-close-btn {
        background: #f1f5f9;
        border: none;
        color: #64748b;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Body cuộn */
    .drawer-body {
        flex: 1;
        overflow-y: auto;
        padding: 10px;
        background: var(--primary);
    }

        .drawer-body .drawer-text {
            color: #f8fafc;
        }

    /* Item Cha */
    .drawer-link-parent {
        padding: 14px 16px;
        border-radius: 8px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-weight: 600;
        font-size: 0.95rem;
        cursor: pointer;
        transition: all 0.2s;
        user-select: none;
    }

        .drawer-link-parent:hover {
            background: #f8fafc;
        }

            .drawer-link-parent:hover .drawer-text {
                color: var(--primary);
            }

    .drawer-item-group.expanded .drawer-link-parent {
        background: #eff6ff;
    }

        .drawer-item-group.expanded .drawer-link-parent .drawer-text {
            color: var(--primary);
        }

    .chevron {
        transition: transform 0.2s;
        color: #94a3b8;
        font-size: 20px;
    }

    .drawer-item-group.expanded .chevron {
        transform: rotate(180deg);
        color: var(--primary);
    }

    /* --- SUB MENU FRAME (KHUNG MENU CON) --- */
    .drawer-sub-panel {
        background: #f8fafc;
        margin: 5px 10px 15px 10px;
        padding: 10px;
        border-radius: 12px;
        border: 1px solid #e2e8f0;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    /* Item con */
    .drawer-sub-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 12px 8px;
        background: #ffffff;
        border-radius: 8px;
        border: 1px solid transparent;
        box-shadow: 0 1px 2px rgba(0,0,0,0.03);
        transition: all 0.2s;
        text-decoration: none;
        color: #475569;
    }

        .drawer-sub-item:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }

    .sub-icon-box {
        margin-bottom: 6px;
        color: #94a3b8;
    }

    .drawer-sub-item:hover .sub-icon-box {
        color: var(--primary);
    }

    .sub-text {
        font-size: 0.8rem;
        font-weight: 500;
        line-height: 1.2;
    }

    .animate-slide-down {
        animation: slideDown 0.2s ease-out forwards;
        transform-origin: top;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: scaleY(0.9);
            height: 0;
        }

        to {
            opacity: 1;
            transform: scaleY(1);
            height: auto;
        }
    }
}
/* ======================================================
   MOBILE SCROLL FIX
   Chỉ kích hoạt khi màn hình < 1024px
   ====================================================== */
@media (max-width: 1024px) {
    html, body, #app, .layout-wrapper {
        height: auto !important;
        min-height: 100vh;
        overflow-y: auto !important;
        overflow-x: clip; /* clip để modal position:fixed vẫn thoát được */
    }

    .layout-body {
        height: auto;
        min-height: calc(100vh - 60px);
        overflow-y: auto;
        overflow-x: clip;
        /* Bỏ padding để các page full-screen dùng hết không gian */
        padding: 0;
    }

    .layout-viewport {
        overflow-x: clip;
        overflow-y: auto;
        height: auto;
        flex: 1;
    }

    .layout-header {
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .layout-content {
        min-height: 0;
        height: auto;
        flex: 1;
    }
}

/* ======================================================
   HEADER INNER — RESPONSIVE (v2 — mobile-hardened)
   ====================================================== */

/* ── Base styles: header-inner không wrap, ngăn tràn ── */
.header-inner {
    flex-wrap: nowrap !important;
    overflow: visible;
}

/* ── RESPONSIVE OVERRIDES for new compact navbar ── */

/* Base: ensure brand-area stays compact */
.brand-area {
    flex-shrink: 0;
    min-width: 0;
    overflow: hidden;
}

/* brand-name: 1 line, ellipsis */
.brand-name {
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    max-width: clamp(80px, 18vw, 200px);
}

/* header-left: compact, centered, overflow hidden */
.header-left {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1 1 0;
    min-width: 0;
    overflow: visible;
    justify-content: flex-start;
}

/* user-area: no shrink */
.user-area { flex-shrink: 0; }

/* ── ≤ 1200px: compact pills ── */
@media (max-width: 1200px) {
    .brand-name { max-width: clamp(60px, 14vw, 160px); font-size: 12px; }
    .level-box-btn, .static-box, .session-timer { padding: 3px 6px; font-size: 11px; gap: 2px; }
    .header-left { gap: 3px; }
    .nav-link { padding: 0 8px; font-size: 12px; }
}

/* ── ≤ 1024px: hide header-left (mobile drawer handles it) ── */
@media (max-width: 1024px) {
    .header-inner { padding: 0 8px !important; height: 44px !important; gap: 6px; }
    .header-left  { display: none !important; }
    .brand-name   { max-width: 160px; font-size: 12px; }
    .user-info    { padding: 3px 8px; font-size: 12px; }
    .header-icon-btn { width: 28px; height: 28px; }
}

/* ── ≤ 768px: hide brand name ── */
@media (max-width: 768px) {
    .header-inner   { padding: 0 6px !important; height: 42px !important; }
    .brand-name     { display: none !important; }
    .brand-area     { gap: 4px; }
    .user-info      { padding: 3px 8px; font-size: 11px; gap: 4px; }
    /* Hide username text, keep icon */
    .user-info span:last-child { display: none !important; }
}

/* ── ≤ 480px: smallest header ── */
@media (max-width: 480px) {
    .header-inner       { padding: 0 4px !important; height: 40px !important; }
    .logo-box           { width: 30px; height: 30px; }
    .logo-box .logo-img { max-width: 30px; max-height: 30px; }
    .menu-toggle-btn    { margin-right: 2px; padding: 5px; }
    .level-box > .dropdown-menu { left: auto; right: 0; }
}

/* ─────────────────────────────────────────────────────
   DRAWER MOBILE: context row (cấp học / năm học / học kỳ)
   Hiện trong drawer ở toàn bộ breakpoint dùng menu thu gọn
   ───────────────────────────────────────────────────── */
/* Mặc định: ẩn trên desktop (drawer không render) */
.drawer-context-row { display: none; }

@media (max-width: 1440px) {
    .drawer-context-row {
        display: flex !important;
        flex-wrap: wrap;
        gap: 6px;
        padding: 10px 16px 14px;
        border-bottom: 1px solid rgba(255,255,255,0.15);
        background: var(--primary);
    }

    .drawer-context-pill {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        background: rgba(255,255,255,0.18);
        color: #fff;
        padding: 6px 12px;
        border-radius: 20px;
        font-size: 13px;
        font-weight: 600;
        cursor: pointer;
        white-space: nowrap;
        transition: background 0.2s;
        user-select: none;
        position: relative;
        border: 1px solid rgba(255,255,255,0.15);
    }

    .drawer-context-pill:hover    { background: rgba(255,255,255,0.32); }
    .drawer-context-pill .material-icons-round { font-size: 15px; }

    .drawer-context-pill .dropdown-menu {
        top: calc(100% + 6px);
        left: 0;
        min-width: 180px;
        z-index: 2100;
        /* Đảm bảo dropdown không bị drawer che */
        max-height: 260px;
        overflow-y: auto;
    }

    /* Nếu pill gần cạnh phải drawer: flip sang trái */
    .drawer-context-pill:last-child .dropdown-menu {
        left: auto;
        right: 0;
    }
}

/*
   Scroll contract for every regular page.  The browser window remains fixed
   below the navigation, while this viewport owns vertical scrolling.  This
   also covers pages that do not render a paginated table with its own scroller.
*/
.layout-viewport {
    overscroll-behavior-y: contain;
    -webkit-overflow-scrolling: touch;
}

.layout-viewport > * {
    flex: 0 0 auto;
    min-width: 0;
    width: 100%;
}