:root {
    --primary-color: #1a4d2e;
    --primary-dark: #143d24;
    --teacher-color: #0b694a;
    --secondary-color: #f1f4f6;
    --text-color: #333333;
    --border-color: #e2e8f0;
    --link-color: #2563eb;
    --btn-blue: #1a4d2e;
    --btn-blue-hover: #143d24;
    --child-bg: #f8fafc;
}

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

body, html {
    width: 100%;
    background-color: #fdfdfd;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    font-size: 15px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
}

/* ================= KHU VỰC ĐĂNG NHẬP CHÍNH ================= */
.login-wrapper {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    max-width: 420px;
    width: 100%;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(26, 77, 46, 0.1);
    border: 1.5px solid #d1fae5;
    padding: 35px 30px;
}

.login-icon-box {
    width: 55px;
    height: 55px;
    background: #e8f5ec;
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin: 0 auto 15px auto;
    border: 1px solid #bbf7d0;
}

.login-title {
    font-size: 20px;
    font-weight: 700;
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.login-sub {
    font-size: 13.5px;
    text-align: center;
    color: #4b6354;
    margin-bottom: 22px;
}

.form-group {
    margin-bottom: 18px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #1e3a29;
    margin-bottom: 6px;
}

.form-group input, 
.form-group select {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid #cbd5e1;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: all 0.2s;
    background-color: #ffffff;
}

.form-group input:focus, 
.form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 77, 46, 0.15);
}

.login-error {
    color: #dc2626;
    font-size: 13px;
    text-align: center;
    margin-bottom: 15px;
    min-height: 18px;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--primary-color) !important;
    color: #ffffff !important;
    border: none;
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 14.5px;
    cursor: pointer;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary:hover {
    background-color: var(--primary-dark) !important;
    box-shadow: 0 4px 12px rgba(26, 77, 46, 0.25);
}

/* ================= ICON MẮT MẬT KHẨU ================= */
.password-wrapper {
    position: relative;
    width: 100%;
}

.password-wrapper input {
    padding-right: 42px !important;
}

.btn-toggle-eye {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #64748b;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    transition: color 0.2s;
    z-index: 5;
}

.btn-toggle-eye:hover { color: var(--primary-color); }
.btn-toggle-eye .fa-eye-slash { display: none; }
.btn-toggle-eye.is-showing .fa-eye { display: none; }
.btn-toggle-eye.is-showing .fa-eye-slash { display: inline-block; }

.field-warn-msg {
    font-size: 11.5px;
    color: #dc2626;
    margin-top: 4px;
    display: none;
    font-weight: 500;
}
.field-warn-msg.is-success { color: #059669; }
.input-error-border { border-color: #dc2626 !important; box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15) !important; }
.input-success-border { border-color: #059669 !important; }

/* ================= TOP NAVBAR & MENU NAVIGATION ================= */
.top-navbar {
    max-width: 1200px;
    margin: 0 auto 25px auto;
    width: 100%;
    background-color: var(--secondary-color);
    padding: 0 15px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    min-height: 54px;
}

.user-brand-left { display: flex; align-items: center; }

.user-name-tag {
    font-size: 14.5px;
    font-weight: 700;
    color: var(--primary-color);
    background: #e2ede6;
    padding: 8px 18px;
    border-radius: 12px;
    border: 1px solid #c2dbcd;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
    align-items: center;
    gap: 5px;
}

.nav-item-wrap {
    position: relative;
    display: flex;
    align-items: center;
    height: 54px;
}

.nav-item {
    text-decoration: none;
    color: #333333;
    padding: 0 16px;
    height: 100%;
    font-weight: 600;
    font-size: 14.5px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    border-bottom: 3.5px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.nav-item.active {
    color: var(--primary-color);
    background-color: #ffffff;
    border-bottom: 3.5px solid var(--primary-color);
}

.nav-item:hover {
    background-color: #e2e8f0;
    color: var(--primary-color);
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background-color: #ffffff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-radius: 0 0 8px 8px;
    border: 1px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    z-index: 1000;
    padding: 6px 0;
}

.dropdown-content a {
    color: #334155;
    padding: 10px 18px;
    text-decoration: none;
    display: block;
    font-size: 13.5px;
    font-weight: 500;
    transition: all 0.2s;
    text-align: left;
}

.dropdown-content a:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
    padding-left: 22px;
}

@media (min-width: 769px) {
    .nav-item-wrap:hover .dropdown-content { display: block; }
}

.mobile-close-btn, .mobile-menu-btn, .mobile-backdrop { display: none; }

/* ================= TRANG CHỦ & BẢNG BIỂU ================= */
.portal-container { 
    display: flex; 
    gap: 20px; 
    width: 100%; 
}

.portal-col { 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    gap: 12px; 
}

.portal-col-header {
    padding: 12px 16px; 
    border-radius: 8px; 
    color: #ffffff;
    font-weight: bold; 
    font-size: 16px; 
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.bg-col-0 { background: #1a4d2e; } 
.bg-col-1 { background: #78281f; } 
.bg-col-2 { background: #B5782A; }

.portal-menu-block { display: flex; flex-direction: column; }
.item-card {
    background: #ffffff; 
    padding: 14px 18px; 
    border-radius: 12px;
    border: 1.5px solid #cbd5e1; 
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: 0.2s; 
    cursor: pointer;
}
.item-card:hover { background-color: #f8fafc; border-color: #78281f; }
.item-card h2 { margin: 0; font-weight: 600; color: #222222; font-size: 15px; }

.sheet-dropdown {
    margin-top: -6px; 
    margin-bottom: 5px; 
    padding: 8px 16px; 
    background: #ffffff;
    border-radius: 0 0 12px 12px; 
    border: 1.5px solid #cbd5e1; 
    border-top: none; 
    display: none;
}
.sheet-dropdown a {
    display: block; 
    text-decoration: none; 
    color: #4a5568;
    padding: 8px 0; 
    font-size: 13.5px; 
    border-bottom: 1px solid #f1f4f6;
}
.sheet-dropdown a:hover { color: #3498db; padding-left: 6px; }

.header-title { text-align: center; color: var(--primary-color); margin-bottom: 25px; font-size: 20px; text-transform: uppercase; font-weight: 700; }
.filter-section {
    display: flex; gap: 15px; margin-bottom: 20px; background: var(--secondary-color);
    padding: 14px 18px; border-radius: 8px; align-items: flex-end; flex-wrap: wrap; justify-content: space-between;
}
.filter-container-left { display: flex; gap: 15px; align-items: flex-end; flex-wrap: wrap; flex: 1; }
.filter-group { display: flex; flex-direction: column; gap: 5px; min-width: 200px; flex: 1; }
.filter-group label { font-weight: 600; color: #4a5568; font-size: 12.5px; text-transform: uppercase; }
.filter-group select, .filter-group input {
    padding: 8px 12px; border-radius: 6px; border: 1px solid #cbd5e0; outline: none; font-size: 13.5px; background-color: #ffffff; width: 100%;
}

.table-responsive { overflow-x: auto; border-radius: 8px; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08); }
table { width: 100%; border-collapse: collapse; background-color: #ffffff; min-width: 900px; }
thead { background-color: var(--primary-color); color: #ffffff; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--border-color); font-size: 13.5px; }
th { font-weight: 600; text-transform: uppercase; font-size: 12.5px; text-align: center; }
tbody tr:hover { background-color: #f1f5f9; }
tbody tr:nth-child(even) { background-color: #fbfbfb; }

#loading { text-align: center; padding: 30px; color: var(--primary-color); font-weight: bold; font-size: 15px; display: none; }

/* ================= NÚT BẤM DƯỚI ĐÁY TRANG ================= */
.bottom-logout-corner {
    display: flex !important; 
    align-items: center; 
    justify-content: flex-end; 
    gap: 12px;
    margin-top: 40px !important; 
    margin-bottom: 30px !important; 
    padding-top: 15px; 
    border-top: 1px dashed var(--border-color);
}
.btn-admin-corner {
    background: #ffffff; color: #1e293b; border: 1px solid #cbd5e1; padding: 8px 16px;
    border-radius: 10px; cursor: pointer; font-size: 13.5px; font-weight: 700; display: flex; align-items: center; gap: 7px;
}
.btn-logout {
    background: #ffe4e6; color: #b91c1c; border: 1px solid #fecdd3; padding: 8px 18px;
    border-radius: 10px; cursor: pointer; font-size: 13.5px; font-weight: 700; display: flex; align-items: center; gap: 7px;
}

/* ================= MODAL PASS 2 (F2) ================= */
.f2-modal-overlay {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background: rgba(0, 0, 0, 0.45) !important;
    backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 999999 !important;
    padding: 15px;
}

.f2-modal-card {
    max-width: 420px;
    width: 100%;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(26, 77, 46, 0.18);
    border: 1.5px solid #d1fae5;
    padding: 35px 30px;
    position: relative;
    animation: modalScaleIn 0.25s ease-out;
}

@keyframes modalScaleIn {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes shakeAnim {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-8px); }
    40%, 80% { transform: translateX(8px); }
}

.shake-anim { animation: shakeAnim 0.35s ease-in-out; }

/* ================= TOAST THÔNG BÁO TINH TẾ "✓ ĐÃ ĐỒNG BỘ" ================= */
.sync-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(30px);
    background: #ffffff;
    color: #1e3a29;
    border: 1px solid #86efac;
    padding: 9px 20px;
    border-radius: 30px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
    font-size: 13.5px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    pointer-events: none;
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 9999999;
}

.sync-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.sync-toast .toast-icon {
    color: #16a34a;
    font-weight: 800;
    font-size: 15px;
}

/* ================= RESPONSIVE MOBILE (< 768px) ================= */
@media (max-width: 768px) {
    .container { padding: 10px; }
    .top-navbar { min-height: 48px; padding: 0 12px; margin-bottom: 15px; }
    .user-name-tag { font-size: 13px; padding: 6px 14px; }
    .mobile-menu-btn {
        display: flex !important;
        align-items: center;
        justify-content: center;
        font-size: 22px;
        color: var(--primary-color);
        cursor: pointer;
        padding: 4px;
        user-select: none;
    }
    .mobile-backdrop {
        position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
        background: rgba(0, 0, 0, 0.5); z-index: 99998; display: none;
    }
    .mobile-backdrop.show { display: block !important; }
    .nav-menu {
        position: fixed !important; top: 0 !important; right: -300px !important; width: 270px !important;
        height: 100vh !important; background-color: #ffffff !important; box-shadow: -4px 0 20px rgba(0, 0, 0, 0.18) !important;
        z-index: 99999 !important; display: flex !important; flex-direction: column !important; padding-top: 60px !important;
        padding-bottom: 20px !important; transition: right 0.28s cubic-bezier(0.4, 0, 0.2, 1) !important;
        align-items: stretch !important; overflow-y: auto !important; gap: 0 !important;
    }
    .nav-menu.open { right: 0 !important; }
    .mobile-close-btn {
        display: flex !important; align-items: center; justify-content: center; position: absolute;
        top: 14px; right: 16px; font-size: 22px; color: #64748b; cursor: pointer; width: 32px; height: 32px;
        border-radius: 50%; background-color: #f1f5f9;
    }
    .nav-item-wrap {
        height: auto !important; width: 100% !important; display: flex !important; flex-direction: column !important;
        align-items: stretch !important; border-bottom: 1px solid #f1f5f9;
    }
    .nav-item {
        height: auto !important; padding: 14px 20px !important; font-size: 14.5px !important; width: 100% !important;
        display: flex !important; justify-content: space-between !important; align-items: center !important;
        border-bottom: none !important; border-left: 4px solid transparent !important; background: transparent !important;
    }
    .nav-item.active {
        border-left: 4px solid var(--primary-color) !important; background-color: #f0fdf4 !important;
        color: var(--primary-color) !important; font-weight: 700 !important;
    }
    .dropdown-content {
        display: none; position: static !important; width: 100% !important; box-shadow: none !important;
        border: none !important; border-top: 1px solid #e2e8f0 !important; background-color: #f8fafc !important; padding: 0 !important;
    }
    .dropdown-content.show-mobile { display: block !important; }
    .dropdown-content a {
        padding: 12px 20px 12px 35px !important; font-size: 13.5px !important; color: #475569 !important;
        border-bottom: 1px dashed #e2e8f0 !important; background: transparent !important;
    }
    .dropdown-content a:last-child { border-bottom: none !important; }
    .dropdown-content a:hover, .dropdown-content a:active { background-color: #e2e8f0 !important; color: var(--primary-color) !important; }
    .portal-container { flex-direction: column !important; gap: 15px !important; }
    .portal-col { width: 100% !important; }
    .bottom-logout-corner { justify-content: center !important; margin-top: 25px !important; margin-bottom: 20px !important; gap: 10px; }
    .btn-admin-corner, .btn-logout { padding: 8px 14px; font-size: 12.5px; }
}